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lib_mpp.F90 in branches/UKMO/dev_r5518_GC3_couple_pkg_GO6/NEMOGCM/NEMO/OPA_SRC/LBC – NEMO

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source: branches/UKMO/dev_r5518_GC3_couple_pkg_GO6/NEMOGCM/NEMO/OPA_SRC/LBC/lib_mpp.F90 @ 8181

Last change on this file since 8181 was 8181, checked in by frrh, 7 years ago
Changes for stand-alone ocean GO6 compatibility.
File size: 164.7 KB

Line
1	MODULE lib_mpp
2	!!======================================================================
3	!! * MODULE lib_mpp *
4	!! Ocean numerics: massively parallel processing library
5	!!=====================================================================
6	!! History : OPA ! 1994 (M. Guyon, J. Escobar, M. Imbard) Original code
7	!! 7.0 ! 1997 (A.M. Treguier) SHMEM additions
8	!! 8.0 ! 1998 (M. Imbard, J. Escobar, L. Colombet ) SHMEM and MPI
9	!! ! 1998 (J.M. Molines) Open boundary conditions
10	!! NEMO 1.0 ! 2003 (J.-M. Molines, G. Madec) F90, free form
11	!! ! 2003 (J.M. Molines) add mpp_ini_north(_3d,_2d)
12	!! - ! 2004 (R. Bourdalle Badie) isend option in mpi
13	!! ! 2004 (J.M. Molines) minloc, maxloc
14	!! - ! 2005 (G. Madec, S. Masson) npolj=5,6 F-point & ice cases
15	!! - ! 2005 (R. Redler) Replacement of MPI_COMM_WORLD except for MPI_Abort
16	!! - ! 2005 (R. Benshila, G. Madec) add extra halo case
17	!! - ! 2008 (R. Benshila) add mpp_ini_ice
18	!! 3.2 ! 2009 (R. Benshila) SHMEM suppression, north fold in lbc_nfd
19	!! 3.2 ! 2009 (O. Marti) add mpp_ini_znl
20	!! 4.0 ! 2011 (G. Madec) move ctl_ routines from in_out_manager
21	!! 3.5 ! 2012 (S.Mocavero, I. Epicoco) Add 'mpp_lnk_bdy_3d', 'mpp_lnk_obc_3d',
22	!! 'mpp_lnk_bdy_2d' and 'mpp_lnk_obc_2d' routines and update
23	!! the mppobc routine to optimize the BDY and OBC communications
24	!! 3.5 ! 2013 ( C. Ethe, G. Madec ) message passing arrays as local variables
25	!! 3.5 ! 2013 (S.Mocavero, I.Epicoco - CMCC) north fold optimizations
26	!!----------------------------------------------------------------------
27
28	!!----------------------------------------------------------------------
29	!! ctl_stop : update momentum and tracer Kz from a tke scheme
30	!! ctl_warn : initialization, namelist read, and parameters control
31	!! ctl_opn : Open file and check if required file is available.
32	!! ctl_nam : Prints informations when an error occurs while reading a namelist
33	!! get_unit : give the index of an unused logical unit
34	!!----------------------------------------------------------------------
35	#if defined key_mpp_mpi
36	!!----------------------------------------------------------------------
37	!! 'key_mpp_mpi' MPI massively parallel processing library
38	!!----------------------------------------------------------------------
39	!! lib_mpp_alloc : allocate mpp arrays
40	!! mynode : indentify the processor unit
41	!! mpp_lnk : interface (defined in lbclnk) for message passing of 2d or 3d arrays (mpp_lnk_2d, mpp_lnk_3d)
42	!! mpp_lnk_3d_gather : Message passing manadgement for two 3D arrays
43	!! mpp_lnk_e : interface (defined in lbclnk) for message passing of 2d array with extra halo (mpp_lnk_2d_e)
44	!! mpp_lnk_icb : interface for message passing of 2d arrays with extra halo for icebergs (mpp_lnk_2d_icb)
45	!! mpprecv :
46	!! mppsend : SUBROUTINE mpp_ini_znl
47	!! mppscatter :
48	!! mppgather :
49	!! mpp_min : generic interface for mppmin_int , mppmin_a_int , mppmin_real, mppmin_a_real
50	!! mpp_max : generic interface for mppmax_int , mppmax_a_int , mppmax_real, mppmax_a_real
51	!! mpp_sum : generic interface for mppsum_int , mppsum_a_int , mppsum_real, mppsum_a_real
52	!! mpp_minloc :
53	!! mpp_maxloc :
54	!! mppsync :
55	!! mppstop :
56	!! mpp_ini_north : initialisation of north fold
57	!! mpp_lbc_north : north fold processors gathering
58	!! mpp_lbc_north_e : variant of mpp_lbc_north for extra outer halo
59	!! mpp_lbc_north_icb : variant of mpp_lbc_north for extra outer halo with icebergs
60	!!----------------------------------------------------------------------
61	USE dom_oce ! ocean space and time domain
62	USE lbcnfd ! north fold treatment
63	USE in_out_manager ! I/O manager
64
65	IMPLICIT NONE
66	PRIVATE
67
68	PUBLIC ctl_stop, ctl_warn, get_unit, ctl_opn, ctl_nam
69	PUBLIC mynode, mppstop, mppsync, mpp_comm_free
70	PUBLIC mpp_ini_north, mpp_lbc_north, mpp_lbc_north_e
71	PUBLIC mpp_min, mpp_max, mpp_sum, mpp_minloc, mpp_maxloc
72	PUBLIC mpp_lnk_3d, mpp_lnk_3d_gather, mpp_lnk_2d, mpp_lnk_2d_e
73	PUBLIC mpp_lnk_2d_9
74	PUBLIC mppscatter, mppgather
75	PUBLIC mpp_ini_ice, mpp_ini_znl
76	PUBLIC mppsize
77	PUBLIC mppsend, mpprecv ! needed by TAM and ICB routines
78	PUBLIC mpp_lnk_bdy_2d, mpp_lnk_bdy_3d
79	PUBLIC mpp_lbc_north_icb, mpp_lnk_2d_icb
80
81	TYPE arrayptr
82	REAL , DIMENSION (:,:), POINTER :: pt2d
83	END TYPE arrayptr
84
85	!! * Interfaces
86	!! define generic interface for these routine as they are called sometimes
87	!! with scalar arguments instead of array arguments, which causes problems
88	!! for the compilation on AIX system as well as NEC and SGI. Ok on COMPACQ
89	INTERFACE mpp_min
90	MODULE PROCEDURE mppmin_a_int, mppmin_int, mppmin_a_real, mppmin_real
91	END INTERFACE
92	INTERFACE mpp_max
93	MODULE PROCEDURE mppmax_a_int, mppmax_int, mppmax_a_real, mppmax_real
94	END INTERFACE
95	INTERFACE mpp_sum
96	MODULE PROCEDURE mppsum_a_int, mppsum_int, mppsum_a_real, mppsum_real, &
97	mppsum_realdd, mppsum_a_realdd
98	END INTERFACE
99	INTERFACE mpp_lbc_north
100	MODULE PROCEDURE mpp_lbc_north_3d, mpp_lbc_north_2d
101	END INTERFACE
102	INTERFACE mpp_minloc
103	MODULE PROCEDURE mpp_minloc2d ,mpp_minloc3d
104	END INTERFACE
105	INTERFACE mpp_maxloc
106	MODULE PROCEDURE mpp_maxloc2d ,mpp_maxloc3d
107	END INTERFACE
108
109	!! ========================= !!
110	!! MPI variable definition !!
111	!! ========================= !!
112	!$AGRIF_DO_NOT_TREAT
113	INCLUDE 'mpif.h'
114	!$AGRIF_END_DO_NOT_TREAT
115
116	LOGICAL, PUBLIC, PARAMETER :: lk_mpp = .TRUE. !: mpp flag
117
118	INTEGER, PARAMETER :: nprocmax = 2**10 ! maximun dimension (required to be a power of 2)
119
120	INTEGER :: mppsize ! number of process
121	INTEGER :: mpprank ! process number [ 0 - size-1 ]
122	!$AGRIF_DO_NOT_TREAT
123	INTEGER, PUBLIC :: mpi_comm_opa ! opa local communicator
124	!$AGRIF_END_DO_NOT_TREAT
125
126	INTEGER :: MPI_SUMDD
127
128	! variables used in case of sea-ice
129	INTEGER, PUBLIC :: ncomm_ice !: communicator made by the processors with sea-ice (public so that it can be freed in limthd)
130	INTEGER :: ngrp_iworld ! group ID for the world processors (for rheology)
131	INTEGER :: ngrp_ice ! group ID for the ice processors (for rheology)
132	INTEGER :: ndim_rank_ice ! number of 'ice' processors
133	INTEGER :: n_ice_root ! number (in the comm_ice) of proc 0 in the ice comm
134	INTEGER, DIMENSION(:), ALLOCATABLE, SAVE :: nrank_ice ! dimension ndim_rank_ice
135
136	! variables used for zonal integration
137	INTEGER, PUBLIC :: ncomm_znl !: communicator made by the processors on the same zonal average
138	LOGICAL, PUBLIC :: l_znl_root ! True on the 'left'most processor on the same row
139	INTEGER :: ngrp_znl ! group ID for the znl processors
140	INTEGER :: ndim_rank_znl ! number of processors on the same zonal average
141	INTEGER, DIMENSION(:), ALLOCATABLE, SAVE :: nrank_znl ! dimension ndim_rank_znl, number of the procs into the same znl domain
142
143	! North fold condition in mpp_mpi with jpni > 1 (PUBLIC for TAM)
144	INTEGER, PUBLIC :: ngrp_world ! group ID for the world processors
145	INTEGER, PUBLIC :: ngrp_opa ! group ID for the opa processors
146	INTEGER, PUBLIC :: ngrp_north ! group ID for the northern processors (to be fold)
147	INTEGER, PUBLIC :: ncomm_north ! communicator made by the processors belonging to ngrp_north
148	INTEGER, PUBLIC :: ndim_rank_north ! number of 'sea' processor in the northern line (can be /= jpni !)
149	INTEGER, PUBLIC :: njmppmax ! value of njmpp for the processors of the northern line
150	INTEGER, PUBLIC :: north_root ! number (in the comm_opa) of proc 0 in the northern comm
151	INTEGER, DIMENSION(:), ALLOCATABLE, SAVE, PUBLIC :: nrank_north ! dimension ndim_rank_north
152
153	! Type of send : standard, buffered, immediate
154	CHARACTER(len=1), PUBLIC :: cn_mpi_send ! type od mpi send/recieve (S=standard, B=bsend, I=isend)
155	LOGICAL, PUBLIC :: l_isend = .FALSE. ! isend use indicator (T if cn_mpi_send='I')
156	INTEGER, PUBLIC :: nn_buffer ! size of the buffer in case of mpi_bsend
157
158	REAL(wp), DIMENSION(:), ALLOCATABLE, SAVE :: tampon ! buffer in case of bsend
159
160	LOGICAL, PUBLIC :: ln_nnogather ! namelist control of northfold comms
161	LOGICAL, PUBLIC :: l_north_nogather = .FALSE. ! internal control of northfold comms
162	INTEGER, PUBLIC :: ityp
163	!!----------------------------------------------------------------------
164	!! NEMO/OPA 3.3 , NEMO Consortium (2010)
165	!! $Id$
166	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
167	!!----------------------------------------------------------------------
168	CONTAINS
169
170
171	FUNCTION mynode( ldtxt, ldname, kumnam_ref , kumnam_cfg , kumond , kstop, localComm )
172	!!----------------------------------------------------------------------
173	!! * routine mynode *
174	!!
175	!! ** Purpose : Find processor unit
176	!!----------------------------------------------------------------------
177	CHARACTER(len=*),DIMENSION(:), INTENT( out) :: ldtxt
178	CHARACTER(len=*) , INTENT(in ) :: ldname
179	INTEGER , INTENT(in ) :: kumnam_ref ! logical unit for reference namelist
180	INTEGER , INTENT(in ) :: kumnam_cfg ! logical unit for configuration namelist
181	INTEGER , INTENT(inout) :: kumond ! logical unit for namelist output
182	INTEGER , INTENT(inout) :: kstop ! stop indicator
183	INTEGER, OPTIONAL , INTENT(in ) :: localComm
184	!
185	INTEGER :: mynode, ierr, code, ji, ii, ios
186	LOGICAL :: mpi_was_called
187	!
188	NAMELIST/nammpp/ cn_mpi_send, nn_buffer, jpni, jpnj, jpnij, ln_nnogather
189	!!----------------------------------------------------------------------
190	!
191	ii = 1
192	WRITE(ldtxt(ii),*) ; ii = ii + 1
193	WRITE(ldtxt(ii),*) 'mynode : mpi initialisation' ; ii = ii + 1
194	WRITE(ldtxt(ii),*) '~~~~~~ ' ; ii = ii + 1
195	!
196
197	REWIND( kumnam_ref ) ! Namelist nammpp in reference namelist: mpi variables
198	READ ( kumnam_ref, nammpp, IOSTAT = ios, ERR = 901)
199	901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'nammpp in reference namelist', lwp )
200
201	REWIND( kumnam_cfg ) ! Namelist nammpp in configuration namelist: mpi variables
202	READ ( kumnam_cfg, nammpp, IOSTAT = ios, ERR = 902 )
203	902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'nammpp in configuration namelist', lwp )
204
205	! ! control print
206	WRITE(ldtxt(ii),*) ' Namelist nammpp' ; ii = ii + 1
207	WRITE(ldtxt(ii),*) ' mpi send type cn_mpi_send = ', cn_mpi_send ; ii = ii + 1
208	WRITE(ldtxt(ii),*) ' size in bytes of exported buffer nn_buffer = ', nn_buffer ; ii = ii + 1
209
210	#if defined key_agrif
211	IF( .NOT. Agrif_Root() ) THEN
212	jpni = Agrif_Parent(jpni )
213	jpnj = Agrif_Parent(jpnj )
214	jpnij = Agrif_Parent(jpnij)
215	ENDIF
216	#endif
217
218	IF(jpnij < 1)THEN
219	! If jpnij is not specified in namelist then we calculate it - this
220	! means there will be no land cutting out.
221	jpnij = jpni * jpnj
222	END IF
223
224	IF( (jpni < 1) .OR. (jpnj < 1) )THEN
225	WRITE(ldtxt(ii),*) ' jpni, jpnj and jpnij will be calculated automatically'; ii = ii + 1
226	ELSE
227	WRITE(ldtxt(ii),*) ' processor grid extent in i jpni = ',jpni; ii = ii + 1
228	WRITE(ldtxt(ii),*) ' processor grid extent in j jpnj = ',jpnj; ii = ii + 1
229	WRITE(ldtxt(ii),*) ' number of local domains jpnij = ',jpnij; ii = ii +1
230	END IF
231
232	WRITE(ldtxt(ii),*) ' avoid use of mpi_allgather at the north fold ln_nnogather = ', ln_nnogather ; ii = ii + 1
233
234	CALL mpi_initialized ( mpi_was_called, code )
235	IF( code /= MPI_SUCCESS ) THEN
236	DO ji = 1, SIZE(ldtxt)
237	IF( TRIM(ldtxt(ji)) /= '' ) WRITE(,) ldtxt(ji) ! control print of mynode
238	END DO
239	WRITE(*, cform_err)
240	WRITE(, ) 'lib_mpp: Error in routine mpi_initialized'
241	CALL mpi_abort( mpi_comm_world, code, ierr )
242	ENDIF
243
244	IF( mpi_was_called ) THEN
245	!
246	SELECT CASE ( cn_mpi_send )
247	CASE ( 'S' ) ! Standard mpi send (blocking)
248	WRITE(ldtxt(ii),*) ' Standard blocking mpi send (send)' ; ii = ii + 1
249	CASE ( 'B' ) ! Buffer mpi send (blocking)
250	WRITE(ldtxt(ii),*) ' Buffer blocking mpi send (bsend)' ; ii = ii + 1
251	IF( Agrif_Root() ) CALL mpi_init_opa( ldtxt, ii, ierr )
252	CASE ( 'I' ) ! Immediate mpi send (non-blocking send)
253	WRITE(ldtxt(ii),*) ' Immediate non-blocking send (isend)' ; ii = ii + 1
254	l_isend = .TRUE.
255	CASE DEFAULT
256	WRITE(ldtxt(ii),cform_err) ; ii = ii + 1
257	WRITE(ldtxt(ii),*) ' bad value for cn_mpi_send = ', cn_mpi_send ; ii = ii + 1
258	kstop = kstop + 1
259	END SELECT
260	ELSE IF ( PRESENT(localComm) .and. .not. mpi_was_called ) THEN
261	WRITE(ldtxt(ii),*) ' lib_mpp: You cannot provide a local communicator ' ; ii = ii + 1
262	WRITE(ldtxt(ii),*) ' without calling MPI_Init before ! ' ; ii = ii + 1
263	kstop = kstop + 1
264	ELSE
265	SELECT CASE ( cn_mpi_send )
266	CASE ( 'S' ) ! Standard mpi send (blocking)
267	WRITE(ldtxt(ii),*) ' Standard blocking mpi send (send)' ; ii = ii + 1
268	CALL mpi_init( ierr )
269	CASE ( 'B' ) ! Buffer mpi send (blocking)
270	WRITE(ldtxt(ii),*) ' Buffer blocking mpi send (bsend)' ; ii = ii + 1
271	IF( Agrif_Root() ) CALL mpi_init_opa( ldtxt, ii, ierr )
272	CASE ( 'I' ) ! Immediate mpi send (non-blocking send)
273	WRITE(ldtxt(ii),*) ' Immediate non-blocking send (isend)' ; ii = ii + 1
274	l_isend = .TRUE.
275	CALL mpi_init( ierr )
276	CASE DEFAULT
277	WRITE(ldtxt(ii),cform_err) ; ii = ii + 1
278	WRITE(ldtxt(ii),*) ' bad value for cn_mpi_send = ', cn_mpi_send ; ii = ii + 1
279	kstop = kstop + 1
280	END SELECT
281	!
282	ENDIF
283
284	IF( PRESENT(localComm) ) THEN
285	IF( Agrif_Root() ) THEN
286	mpi_comm_opa = localComm
287	ENDIF
288	ELSE
289	CALL mpi_comm_dup( mpi_comm_world, mpi_comm_opa, code)
290	IF( code /= MPI_SUCCESS ) THEN
291	DO ji = 1, SIZE(ldtxt)
292	IF( TRIM(ldtxt(ji)) /= '' ) WRITE(,) ldtxt(ji) ! control print of mynode
293	END DO
294	WRITE(*, cform_err)
295	WRITE(, ) ' lib_mpp: Error in routine mpi_comm_dup'
296	CALL mpi_abort( mpi_comm_world, code, ierr )
297	ENDIF
298	ENDIF
299
300	CALL mpi_comm_rank( mpi_comm_opa, mpprank, ierr )
301	CALL mpi_comm_size( mpi_comm_opa, mppsize, ierr )
302	mynode = mpprank
303
304	IF( mynode == 0 ) THEN
305	CALL ctl_opn( kumond, TRIM(ldname), 'UNKNOWN', 'FORMATTED', 'SEQUENTIAL', -1, 6, .FALSE. , 1 )
306	WRITE(kumond, nammpp)
307	ENDIF
308	!
309	CALL MPI_OP_CREATE(DDPDD_MPI, .TRUE., MPI_SUMDD, ierr)
310	!
311	END FUNCTION mynode
312
313	SUBROUTINE mpp_lnk_3d( ptab, cd_type, psgn, cd_mpp, pval )
314	!!----------------------------------------------------------------------
315	!! * routine mpp_lnk_3d *
316	!!
317	!! ** Purpose : Message passing manadgement
318	!!
319	!! ** Method : Use mppsend and mpprecv function for passing mask
320	!! between processors following neighboring subdomains.
321	!! domain parameters
322	!! nlci : first dimension of the local subdomain
323	!! nlcj : second dimension of the local subdomain
324	!! nbondi : mark for "east-west local boundary"
325	!! nbondj : mark for "north-south local boundary"
326	!! noea : number for local neighboring processors
327	!! nowe : number for local neighboring processors
328	!! noso : number for local neighboring processors
329	!! nono : number for local neighboring processors
330	!!
331	!! ** Action : ptab with update value at its periphery
332	!!
333	!!----------------------------------------------------------------------
334	REAL(wp), DIMENSION(jpi,jpj,jpk), INTENT(inout) :: ptab ! 3D array on which the boundary condition is applied
335	CHARACTER(len=1) , INTENT(in ) :: cd_type ! define the nature of ptab array grid-points
336	! ! = T , U , V , F , W points
337	REAL(wp) , INTENT(in ) :: psgn ! =-1 the sign change across the north fold boundary
338	! ! = 1. , the sign is kept
339	CHARACTER(len=3), OPTIONAL , INTENT(in ) :: cd_mpp ! fill the overlap area only
340	REAL(wp) , OPTIONAL , INTENT(in ) :: pval ! background value (used at closed boundaries)
341	!!
342	INTEGER :: ji, jj, jk, jl ! dummy loop indices
343	INTEGER :: imigr, iihom, ijhom ! temporary integers
344	INTEGER :: ml_req1, ml_req2, ml_err ! for key_mpi_isend
345	REAL(wp) :: zland
346	INTEGER, DIMENSION(MPI_STATUS_SIZE) :: ml_stat ! for key_mpi_isend
347	!
348	REAL(wp), DIMENSION(:,:,:,:), ALLOCATABLE :: zt3ns, zt3sn ! 3d for north-south & south-north
349	REAL(wp), DIMENSION(:,:,:,:), ALLOCATABLE :: zt3ew, zt3we ! 3d for east-west & west-east
350
351	!!----------------------------------------------------------------------
352
353	ALLOCATE( zt3ns(jpi,jprecj,jpk,2), zt3sn(jpi,jprecj,jpk,2), &
354	& zt3ew(jpj,jpreci,jpk,2), zt3we(jpj,jpreci,jpk,2) )
355
356	!
357	IF( PRESENT( pval ) ) THEN ; zland = pval ! set land value
358	ELSE ; zland = 0.e0 ! zero by default
359	ENDIF
360
361	! 1. standard boundary treatment
362	! ------------------------------
363	IF( PRESENT( cd_mpp ) ) THEN ! only fill added line/raw with existing values
364	!
365	! WARNING ptab is defined only between nld and nle
366	DO jk = 1, jpk
367	DO jj = nlcj+1, jpj ! added line(s) (inner only)
368	ptab(nldi :nlei , jj ,jk) = ptab(nldi:nlei, nlej,jk)
369	ptab(1 :nldi-1, jj ,jk) = ptab(nldi , nlej,jk)
370	ptab(nlei+1:nlci , jj ,jk) = ptab( nlei, nlej,jk)
371	END DO
372	DO ji = nlci+1, jpi ! added column(s) (full)
373	ptab(ji ,nldj :nlej ,jk) = ptab( nlei,nldj:nlej,jk)
374	ptab(ji ,1 :nldj-1,jk) = ptab( nlei,nldj ,jk)
375	ptab(ji ,nlej+1:jpj ,jk) = ptab( nlei, nlej,jk)
376	END DO
377	END DO
378	!
379	ELSE ! standard close or cyclic treatment
380	!
381	! ! East-West boundaries
382	! !* Cyclic east-west
383	IF( nbondi == 2 .AND. (nperio == 1 .OR. nperio == 4 .OR. nperio == 6) ) THEN
384	ptab( 1 ,:,:) = ptab(jpim1,:,:)
385	ptab(jpi,:,:) = ptab( 2 ,:,:)
386	ELSE !* closed
387	IF( .NOT. cd_type == 'F' ) ptab( 1 :jpreci,:,:) = zland ! south except F-point
388	ptab(nlci-jpreci+1:jpi ,:,:) = zland ! north
389	ENDIF
390	! ! North-South boundaries (always closed)
391	IF( .NOT. cd_type == 'F' ) ptab(:, 1 :jprecj,:) = zland ! south except F-point
392	ptab(:,nlcj-jprecj+1:jpj ,:) = zland ! north
393	!
394	ENDIF
395
396	! 2. East and west directions exchange
397	! ------------------------------------
398	! we play with the neigbours AND the row number because of the periodicity
399	!
400	SELECT CASE ( nbondi ) ! Read Dirichlet lateral conditions
401	CASE ( -1, 0, 1 ) ! all exept 2 (i.e. close case)
402	iihom = nlci-nreci
403	DO jl = 1, jpreci
404	zt3ew(:,jl,:,1) = ptab(jpreci+jl,:,:)
405	zt3we(:,jl,:,1) = ptab(iihom +jl,:,:)
406	END DO
407	END SELECT
408	!
409	! ! Migrations
410	imigr = jpreci * jpj * jpk
411	!
412	SELECT CASE ( nbondi )
413	CASE ( -1 )
414	CALL mppsend( 2, zt3we(1,1,1,1), imigr, noea, ml_req1 )
415	CALL mpprecv( 1, zt3ew(1,1,1,2), imigr, noea )
416	IF(l_isend) CALL mpi_wait(ml_req1, ml_stat, ml_err)
417	CASE ( 0 )
418	CALL mppsend( 1, zt3ew(1,1,1,1), imigr, nowe, ml_req1 )
419	CALL mppsend( 2, zt3we(1,1,1,1), imigr, noea, ml_req2 )
420	CALL mpprecv( 1, zt3ew(1,1,1,2), imigr, noea )
421	CALL mpprecv( 2, zt3we(1,1,1,2), imigr, nowe )
422	IF(l_isend) CALL mpi_wait(ml_req1, ml_stat, ml_err)
423	IF(l_isend) CALL mpi_wait(ml_req2, ml_stat, ml_err)
424	CASE ( 1 )
425	CALL mppsend( 1, zt3ew(1,1,1,1), imigr, nowe, ml_req1 )
426	CALL mpprecv( 2, zt3we(1,1,1,2), imigr, nowe )
427	IF(l_isend) CALL mpi_wait(ml_req1, ml_stat, ml_err)
428	END SELECT
429	!
430	! ! Write Dirichlet lateral conditions
431	iihom = nlci-jpreci
432	!
433	SELECT CASE ( nbondi )
434	CASE ( -1 )
435	DO jl = 1, jpreci
436	ptab(iihom+jl,:,:) = zt3ew(:,jl,:,2)
437	END DO
438	CASE ( 0 )
439	DO jl = 1, jpreci
440	ptab(jl ,:,:) = zt3we(:,jl,:,2)
441	ptab(iihom+jl,:,:) = zt3ew(:,jl,:,2)
442	END DO
443	CASE ( 1 )
444	DO jl = 1, jpreci
445	ptab(jl ,:,:) = zt3we(:,jl,:,2)
446	END DO
447	END SELECT
448
449
450	! 3. North and south directions
451	! -----------------------------
452	! always closed : we play only with the neigbours
453	!
454	IF( nbondj /= 2 ) THEN ! Read Dirichlet lateral conditions
455	ijhom = nlcj-nrecj
456	DO jl = 1, jprecj
457	zt3sn(:,jl,:,1) = ptab(:,ijhom +jl,:)
458	zt3ns(:,jl,:,1) = ptab(:,jprecj+jl,:)
459	END DO
460	ENDIF
461	!
462	! ! Migrations
463	imigr = jprecj * jpi * jpk
464	!
465	SELECT CASE ( nbondj )
466	CASE ( -1 )
467	CALL mppsend( 4, zt3sn(1,1,1,1), imigr, nono, ml_req1 )
468	CALL mpprecv( 3, zt3ns(1,1,1,2), imigr, nono )
469	IF(l_isend) CALL mpi_wait(ml_req1, ml_stat, ml_err)
470	CASE ( 0 )
471	CALL mppsend( 3, zt3ns(1,1,1,1), imigr, noso, ml_req1 )
472	CALL mppsend( 4, zt3sn(1,1,1,1), imigr, nono, ml_req2 )
473	CALL mpprecv( 3, zt3ns(1,1,1,2), imigr, nono )
474	CALL mpprecv( 4, zt3sn(1,1,1,2), imigr, noso )
475	IF(l_isend) CALL mpi_wait(ml_req1, ml_stat, ml_err)
476	IF(l_isend) CALL mpi_wait(ml_req2, ml_stat, ml_err)
477	CASE ( 1 )
478	CALL mppsend( 3, zt3ns(1,1,1,1), imigr, noso, ml_req1 )
479	CALL mpprecv( 4, zt3sn(1,1,1,2), imigr, noso )
480	IF(l_isend) CALL mpi_wait(ml_req1, ml_stat, ml_err)
481	END SELECT
482	!
483	! ! Write Dirichlet lateral conditions
484	ijhom = nlcj-jprecj
485	!
486	SELECT CASE ( nbondj )
487	CASE ( -1 )
488	DO jl = 1, jprecj
489	ptab(:,ijhom+jl,:) = zt3ns(:,jl,:,2)
490	END DO
491	CASE ( 0 )
492	DO jl = 1, jprecj
493	ptab(:,jl ,:) = zt3sn(:,jl,:,2)
494	ptab(:,ijhom+jl,:) = zt3ns(:,jl,:,2)
495	END DO
496	CASE ( 1 )
497	DO jl = 1, jprecj
498	ptab(:,jl,:) = zt3sn(:,jl,:,2)
499	END DO
500	END SELECT
501
502
503	! 4. north fold treatment
504	! -----------------------
505	!
506	IF( npolj /= 0 .AND. .NOT. PRESENT(cd_mpp) ) THEN
507	!
508	SELECT CASE ( jpni )
509	CASE ( 1 ) ; CALL lbc_nfd ( ptab, cd_type, psgn ) ! only 1 northern proc, no mpp
510	CASE DEFAULT ; CALL mpp_lbc_north( ptab, cd_type, psgn ) ! for all northern procs.
511	END SELECT
512	!
513	ENDIF
514	!
515	DEALLOCATE( zt3ns, zt3sn, zt3ew, zt3we )
516	!
517	END SUBROUTINE mpp_lnk_3d
518
519	SUBROUTINE mpp_lnk_2d_multiple( pt2d_array , type_array , psgn_array , num_fields , cd_mpp, pval )
520	!!----------------------------------------------------------------------
521	!! * routine mpp_lnk_2d_multiple *
522	!!
523	!! ** Purpose : Message passing management for multiple 2d arrays
524	!!
525	!! ** Method : Use mppsend and mpprecv function for passing mask
526	!! between processors following neighboring subdomains.
527	!! domain parameters
528	!! nlci : first dimension of the local subdomain
529	!! nlcj : second dimension of the local subdomain
530	!! nbondi : mark for "east-west local boundary"
531	!! nbondj : mark for "north-south local boundary"
532	!! noea : number for local neighboring processors
533	!! nowe : number for local neighboring processors
534	!! noso : number for local neighboring processors
535	!! nono : number for local neighboring processors
536	!!
537	!!----------------------------------------------------------------------
538
539	INTEGER :: num_fields
540	TYPE( arrayptr ), DIMENSION(:) :: pt2d_array
541	CHARACTER(len=1), DIMENSION(:), INTENT(in ) :: type_array ! define the nature of ptab array grid-points
542	! ! = T , U , V , F , W and I points
543	REAL(wp) , DIMENSION(:), INTENT(in ) :: psgn_array ! =-1 the sign change across the north fold boundary
544	! ! = 1. , the sign is kept
545	CHARACTER(len=3), OPTIONAL , INTENT(in ) :: cd_mpp ! fill the overlap area only
546	REAL(wp) , OPTIONAL , INTENT(in ) :: pval ! background value (used at closed boundaries)
547	!!
548	INTEGER :: ji, jj, jl ! dummy loop indices
549	INTEGER :: ii !!MULTI SEND DUMMY LOOP INDICES
550	INTEGER :: imigr, iihom, ijhom ! temporary integers
551	INTEGER :: ml_req1, ml_req2, ml_err ! for key_mpi_isend
552
553	REAL(wp) :: zland
554	INTEGER, DIMENSION(MPI_STATUS_SIZE) :: ml_stat ! for key_mpi_isend
555	!
556	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: zt2ns, zt2sn ! 2d for north-south & south-north
557	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: zt2ew, zt2we ! 2d for east-west & west-east
558
559	!!----------------------------------------------------------------------
560
561	ALLOCATE( zt2ns(jpi,jprecj,2num_fields), zt2sn(jpi,jprecj,2num_fields), &
562	& zt2ew(jpj,jpreci,2num_fields), zt2we(jpj,jpreci,2num_fields) )
563
564	!
565	IF( PRESENT( pval ) ) THEN ; zland = pval ! set land value
566	ELSE ; zland = 0.e0 ! zero by default
567	ENDIF
568
569	! 1. standard boundary treatment
570	! ------------------------------
571	!
572	!First Array
573	DO ii = 1 , num_fields
574	IF( PRESENT( cd_mpp ) ) THEN ! only fill added line/raw with existing values
575	!
576	! WARNING pt2d is defined only between nld and nle
577	DO jj = nlcj+1, jpj ! added line(s) (inner only)
578	pt2d_array(ii)%pt2d(nldi :nlei , jj) = pt2d_array(ii)%pt2d(nldi:nlei, nlej)
579	pt2d_array(ii)%pt2d(1 :nldi-1, jj) = pt2d_array(ii)%pt2d(nldi , nlej)
580	pt2d_array(ii)%pt2d(nlei+1:nlci , jj) = pt2d_array(ii)%pt2d( nlei, nlej)
581	END DO
582	DO ji = nlci+1, jpi ! added column(s) (full)
583	pt2d_array(ii)%pt2d(ji, nldj :nlej ) = pt2d_array(ii)%pt2d(nlei, nldj:nlej)
584	pt2d_array(ii)%pt2d(ji, 1 :nldj-1) = pt2d_array(ii)%pt2d(nlei, nldj )
585	pt2d_array(ii)%pt2d(ji, nlej+1:jpj ) = pt2d_array(ii)%pt2d(nlei, nlej)
586	END DO
587	!
588	ELSE ! standard close or cyclic treatment
589	!
590	! ! East-West boundaries
591	IF( nbondi == 2 .AND. & ! Cyclic east-west
592	& (nperio == 1 .OR. nperio == 4 .OR. nperio == 6) ) THEN
593	pt2d_array(ii)%pt2d( 1 , : ) = pt2d_array(ii)%pt2d( jpim1, : ) ! west
594	pt2d_array(ii)%pt2d( jpi , : ) = pt2d_array(ii)%pt2d( 2 , : ) ! east
595	ELSE ! closed
596	IF( .NOT. type_array(ii) == 'F' ) pt2d_array(ii)%pt2d( 1 : jpreci,:) = zland ! south except F-point
597	pt2d_array(ii)%pt2d(nlci-jpreci+1 : jpi ,:) = zland ! north
598	ENDIF
599	! ! North-South boundaries (always closed)
600	IF( .NOT. type_array(ii) == 'F' ) pt2d_array(ii)%pt2d(:, 1:jprecj ) = zland ! south except F-point
601	pt2d_array(ii)%pt2d(:, nlcj-jprecj+1:jpj ) = zland ! north
602	!
603	ENDIF
604	END DO
605
606	! 2. East and west directions exchange
607	! ------------------------------------
608	! we play with the neigbours AND the row number because of the periodicity
609	!
610	DO ii = 1 , num_fields
611	SELECT CASE ( nbondi ) ! Read Dirichlet lateral conditions
612	CASE ( -1, 0, 1 ) ! all exept 2 (i.e. close case)
613	iihom = nlci-nreci
614	DO jl = 1, jpreci
615	zt2ew( : , jl , ii ) = pt2d_array(ii)%pt2d( jpreci+jl , : )
616	zt2we( : , jl , ii ) = pt2d_array(ii)%pt2d( iihom +jl , : )
617	END DO
618	END SELECT
619	END DO
620	!
621	! ! Migrations
622	imigr = jpreci * jpj
623	!
624	SELECT CASE ( nbondi )
625	CASE ( -1 )
626	CALL mppsend( 2, zt2we(1,1,1), num_fields*imigr, noea, ml_req1 )
627	CALL mpprecv( 1, zt2ew(1,1,num_fields+1), num_fields*imigr, noea )
628	IF(l_isend) CALL mpi_wait(ml_req1,ml_stat,ml_err)
629	CASE ( 0 )
630	CALL mppsend( 1, zt2ew(1,1,1), num_fields*imigr, nowe, ml_req1 )
631	CALL mppsend( 2, zt2we(1,1,1), num_fields*imigr, noea, ml_req2 )
632	CALL mpprecv( 1, zt2ew(1,1,num_fields+1), num_fields*imigr, noea )
633	CALL mpprecv( 2, zt2we(1,1,num_fields+1), num_fields*imigr, nowe )
634	IF(l_isend) CALL mpi_wait(ml_req1,ml_stat,ml_err)
635	IF(l_isend) CALL mpi_wait(ml_req2,ml_stat,ml_err)
636	CASE ( 1 )
637	CALL mppsend( 1, zt2ew(1,1,1), num_fields*imigr, nowe, ml_req1 )
638	CALL mpprecv( 2, zt2we(1,1,num_fields+1), num_fields*imigr, nowe )
639	IF(l_isend) CALL mpi_wait(ml_req1,ml_stat,ml_err)
640	END SELECT
641	!
642	! ! Write Dirichlet lateral conditions
643	iihom = nlci - jpreci
644	!
645
646	DO ii = 1 , num_fields
647	SELECT CASE ( nbondi )
648	CASE ( -1 )
649	DO jl = 1, jpreci
650	pt2d_array(ii)%pt2d( iihom+jl , : ) = zt2ew(:,jl,num_fields+ii)
651	END DO
652	CASE ( 0 )
653	DO jl = 1, jpreci
654	pt2d_array(ii)%pt2d( jl , : ) = zt2we(:,jl,num_fields+ii)
655	pt2d_array(ii)%pt2d( iihom+jl , : ) = zt2ew(:,jl,num_fields+ii)
656	END DO
657	CASE ( 1 )
658	DO jl = 1, jpreci
659	pt2d_array(ii)%pt2d( jl , : )= zt2we(:,jl,num_fields+ii)
660	END DO
661	END SELECT
662	END DO
663
664	! 3. North and south directions
665	! -----------------------------
666	! always closed : we play only with the neigbours
667	!
668	!First Array
669	DO ii = 1 , num_fields
670	IF( nbondj /= 2 ) THEN ! Read Dirichlet lateral conditions
671	ijhom = nlcj-nrecj
672	DO jl = 1, jprecj
673	zt2sn(:,jl , ii) = pt2d_array(ii)%pt2d( : , ijhom +jl )
674	zt2ns(:,jl , ii) = pt2d_array(ii)%pt2d( : , jprecj+jl )
675	END DO
676	ENDIF
677	END DO
678	!
679	! ! Migrations
680	imigr = jprecj * jpi
681	!
682	SELECT CASE ( nbondj )
683	CASE ( -1 )
684	CALL mppsend( 4, zt2sn(1,1,1), num_fields*imigr, nono, ml_req1 )
685	CALL mpprecv( 3, zt2ns(1,1,num_fields+1), num_fields*imigr, nono )
686	IF(l_isend) CALL mpi_wait(ml_req1,ml_stat,ml_err)
687	CASE ( 0 )
688	CALL mppsend( 3, zt2ns(1,1,1), num_fields*imigr, noso, ml_req1 )
689	CALL mppsend( 4, zt2sn(1,1,1), num_fields*imigr, nono, ml_req2 )
690	CALL mpprecv( 3, zt2ns(1,1,num_fields+1), num_fields*imigr, nono )
691	CALL mpprecv( 4, zt2sn(1,1,num_fields+1), num_fields*imigr, noso )
692	IF(l_isend) CALL mpi_wait(ml_req1,ml_stat,ml_err)
693	IF(l_isend) CALL mpi_wait(ml_req2,ml_stat,ml_err)
694	CASE ( 1 )
695	CALL mppsend( 3, zt2ns(1,1,1), num_fields*imigr, noso, ml_req1 )
696	CALL mpprecv( 4, zt2sn(1,1,num_fields+1), num_fields*imigr, noso )
697	IF(l_isend) CALL mpi_wait(ml_req1,ml_stat,ml_err)
698	END SELECT
699	!
700	! ! Write Dirichlet lateral conditions
701	ijhom = nlcj - jprecj
702	!
703
704	DO ii = 1 , num_fields
705	!First Array
706	SELECT CASE ( nbondj )
707	CASE ( -1 )
708	DO jl = 1, jprecj
709	pt2d_array(ii)%pt2d( : , ijhom+jl ) = zt2ns( : , jl , num_fields+ii )
710	END DO
711	CASE ( 0 )
712	DO jl = 1, jprecj
713	pt2d_array(ii)%pt2d( : , jl ) = zt2sn( : , jl , num_fields + ii)
714	pt2d_array(ii)%pt2d( : , ijhom + jl ) = zt2ns( : , jl , num_fields + ii )
715	END DO
716	CASE ( 1 )
717	DO jl = 1, jprecj
718	pt2d_array(ii)%pt2d( : , jl ) = zt2sn( : , jl , num_fields + ii )
719	END DO
720	END SELECT
721	END DO
722
723	! 4. north fold treatment
724	! -----------------------
725	!
726	DO ii = 1 , num_fields
727	!First Array
728	IF( npolj /= 0 .AND. .NOT. PRESENT(cd_mpp) ) THEN
729	!
730	SELECT CASE ( jpni )
731	CASE ( 1 ) ; CALL lbc_nfd ( pt2d_array(ii)%pt2d( : , : ), type_array(ii) , psgn_array(ii) ) ! only 1 northern proc, no mpp
732	CASE DEFAULT ; CALL mpp_lbc_north( pt2d_array(ii)%pt2d( : , : ), type_array(ii), psgn_array(ii) ) ! for all northern procs.
733	END SELECT
734	!
735	ENDIF
736	!
737	END DO
738
739	DEALLOCATE( zt2ns, zt2sn, zt2ew, zt2we )
740	!
741	END SUBROUTINE mpp_lnk_2d_multiple
742
743
744	SUBROUTINE load_array(pt2d,cd_type,psgn,pt2d_array, type_array, psgn_array,num_fields)
745	!!---------------------------------------------------------------------
746	REAL(wp), DIMENSION(jpi,jpj), TARGET , INTENT(inout) :: pt2d ! Second 2D array on which the boundary condition is applied
747	CHARACTER(len=1) , INTENT(in ) :: cd_type ! define the nature of ptab array grid-points
748	REAL(wp) , INTENT(in ) :: psgn ! =-1 the sign change across the north fold boundary
749	TYPE(arrayptr) , DIMENSION(9) :: pt2d_array
750	CHARACTER(len=1) , DIMENSION(9) :: type_array ! define the nature of ptab array grid-points
751	REAL(wp) , DIMENSION(9) :: psgn_array ! =-1 the sign change across the north fold boundary
752	INTEGER , INTENT (inout):: num_fields
753	!!---------------------------------------------------------------------
754	num_fields=num_fields+1
755	pt2d_array(num_fields)%pt2d=>pt2d
756	type_array(num_fields)=cd_type
757	psgn_array(num_fields)=psgn
758	END SUBROUTINE load_array
759
760
761	SUBROUTINE mpp_lnk_2d_9( pt2dA, cd_typeA, psgnA, pt2dB, cd_typeB, psgnB, pt2dC, cd_typeC, psgnC &
762	& , pt2dD, cd_typeD, psgnD, pt2dE, cd_typeE, psgnE, pt2dF, cd_typeF, psgnF &
763	& , pt2dG, cd_typeG, psgnG, pt2dH, cd_typeH, psgnH, pt2dI, cd_typeI, psgnI, cd_mpp, pval)
764	!!---------------------------------------------------------------------
765	! Second 2D array on which the boundary condition is applied
766	REAL(wp), DIMENSION(jpi,jpj), TARGET , INTENT(inout) :: pt2dA
767	REAL(wp), DIMENSION(jpi,jpj), TARGET, OPTIONAL, INTENT(inout) :: pt2dB , pt2dC , pt2dD , pt2dE
768	REAL(wp), DIMENSION(jpi,jpj), TARGET, OPTIONAL, INTENT(inout) :: pt2dF , pt2dG , pt2dH , pt2dI
769	! define the nature of ptab array grid-points
770	CHARACTER(len=1) , INTENT(in ) :: cd_typeA
771	CHARACTER(len=1) , OPTIONAL, INTENT(in ) :: cd_typeB , cd_typeC , cd_typeD , cd_typeE
772	CHARACTER(len=1) , OPTIONAL, INTENT(in ) :: cd_typeF , cd_typeG , cd_typeH , cd_typeI
773	! =-1 the sign change across the north fold boundary
774	REAL(wp) , INTENT(in ) :: psgnA
775	REAL(wp) , OPTIONAL, INTENT(in ) :: psgnB , psgnC , psgnD , psgnE
776	REAL(wp) , OPTIONAL, INTENT(in ) :: psgnF , psgnG , psgnH , psgnI
777	CHARACTER(len=3) , OPTIONAL, INTENT(in ) :: cd_mpp ! fill the overlap area only
778	REAL(wp) , OPTIONAL, INTENT(in ) :: pval ! background value (used at closed boundaries)
779	!!
780	TYPE(arrayptr) , DIMENSION(9) :: pt2d_array
781	CHARACTER(len=1) , DIMENSION(9) :: type_array ! define the nature of ptab array grid-points
782	! ! = T , U , V , F , W and I points
783	REAL(wp) , DIMENSION(9) :: psgn_array ! =-1 the sign change across the north fold boundary
784	INTEGER :: num_fields
785	!!---------------------------------------------------------------------
786
787	num_fields = 0
788
789	!! Load the first array
790	CALL load_array(pt2dA,cd_typeA,psgnA,pt2d_array, type_array, psgn_array,num_fields)
791
792	!! Look if more arrays are added
793	IF(PRESENT (psgnB) )CALL load_array(pt2dB,cd_typeB,psgnB,pt2d_array, type_array, psgn_array,num_fields)
794	IF(PRESENT (psgnC) )CALL load_array(pt2dC,cd_typeC,psgnC,pt2d_array, type_array, psgn_array,num_fields)
795	IF(PRESENT (psgnD) )CALL load_array(pt2dD,cd_typeD,psgnD,pt2d_array, type_array, psgn_array,num_fields)
796	IF(PRESENT (psgnE) )CALL load_array(pt2dE,cd_typeE,psgnE,pt2d_array, type_array, psgn_array,num_fields)
797	IF(PRESENT (psgnF) )CALL load_array(pt2dF,cd_typeF,psgnF,pt2d_array, type_array, psgn_array,num_fields)
798	IF(PRESENT (psgnG) )CALL load_array(pt2dG,cd_typeG,psgnG,pt2d_array, type_array, psgn_array,num_fields)
799	IF(PRESENT (psgnH) )CALL load_array(pt2dH,cd_typeH,psgnH,pt2d_array, type_array, psgn_array,num_fields)
800	IF(PRESENT (psgnI) )CALL load_array(pt2dI,cd_typeI,psgnI,pt2d_array, type_array, psgn_array,num_fields)
801
802	CALL mpp_lnk_2d_multiple(pt2d_array,type_array,psgn_array,num_fields,cd_mpp,pval)
803	END SUBROUTINE mpp_lnk_2d_9
804
805
806	SUBROUTINE mpp_lnk_2d( pt2d, cd_type, psgn, cd_mpp, pval )
807	!!----------------------------------------------------------------------
808	!! * routine mpp_lnk_2d *
809	!!
810	!! ** Purpose : Message passing manadgement for 2d array
811	!!
812	!! ** Method : Use mppsend and mpprecv function for passing mask
813	!! between processors following neighboring subdomains.
814	!! domain parameters
815	!! nlci : first dimension of the local subdomain
816	!! nlcj : second dimension of the local subdomain
817	!! nbondi : mark for "east-west local boundary"
818	!! nbondj : mark for "north-south local boundary"
819	!! noea : number for local neighboring processors
820	!! nowe : number for local neighboring processors
821	!! noso : number for local neighboring processors
822	!! nono : number for local neighboring processors
823	!!
824	!!----------------------------------------------------------------------
825	REAL(wp), DIMENSION(jpi,jpj), INTENT(inout) :: pt2d ! 2D array on which the boundary condition is applied
826	CHARACTER(len=1) , INTENT(in ) :: cd_type ! define the nature of ptab array grid-points
827	! ! = T , U , V , F , W and I points
828	REAL(wp) , INTENT(in ) :: psgn ! =-1 the sign change across the north fold boundary
829	! ! = 1. , the sign is kept
830	CHARACTER(len=3), OPTIONAL , INTENT(in ) :: cd_mpp ! fill the overlap area only
831	REAL(wp) , OPTIONAL , INTENT(in ) :: pval ! background value (used at closed boundaries)
832	!!
833	INTEGER :: ji, jj, jl ! dummy loop indices
834	INTEGER :: imigr, iihom, ijhom ! temporary integers
835	INTEGER :: ml_req1, ml_req2, ml_err ! for key_mpi_isend
836	REAL(wp) :: zland
837	INTEGER, DIMENSION(MPI_STATUS_SIZE) :: ml_stat ! for key_mpi_isend
838	!
839	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: zt2ns, zt2sn ! 2d for north-south & south-north
840	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: zt2ew, zt2we ! 2d for east-west & west-east
841
842	!!----------------------------------------------------------------------
843
844	ALLOCATE( zt2ns(jpi,jprecj,2), zt2sn(jpi,jprecj,2), &
845	& zt2ew(jpj,jpreci,2), zt2we(jpj,jpreci,2) )
846
847	!
848	IF( PRESENT( pval ) ) THEN ; zland = pval ! set land value
849	ELSE ; zland = 0.e0 ! zero by default
850	ENDIF
851
852	! 1. standard boundary treatment
853	! ------------------------------
854	!
855	IF( PRESENT( cd_mpp ) ) THEN ! only fill added line/raw with existing values
856	!
857	! WARNING pt2d is defined only between nld and nle
858	DO jj = nlcj+1, jpj ! added line(s) (inner only)
859	pt2d(nldi :nlei , jj ) = pt2d(nldi:nlei, nlej)
860	pt2d(1 :nldi-1, jj ) = pt2d(nldi , nlej)
861	pt2d(nlei+1:nlci , jj ) = pt2d( nlei, nlej)
862	END DO
863	DO ji = nlci+1, jpi ! added column(s) (full)
864	pt2d(ji ,nldj :nlej ) = pt2d( nlei,nldj:nlej)
865	pt2d(ji ,1 :nldj-1) = pt2d( nlei,nldj )
866	pt2d(ji ,nlej+1:jpj ) = pt2d( nlei, nlej)
867	END DO
868	!
869	ELSE ! standard close or cyclic treatment
870	!
871	! ! East-West boundaries
872	IF( nbondi == 2 .AND. & ! Cyclic east-west
873	& (nperio == 1 .OR. nperio == 4 .OR. nperio == 6) ) THEN
874	pt2d( 1 ,:) = pt2d(jpim1,:) ! west
875	pt2d(jpi,:) = pt2d( 2 ,:) ! east
876	ELSE ! closed
877	IF( .NOT. cd_type == 'F' ) pt2d( 1 :jpreci,:) = zland ! south except F-point
878	pt2d(nlci-jpreci+1:jpi ,:) = zland ! north
879	ENDIF
880	! ! North-South boundaries (always closed)
881	IF( .NOT. cd_type == 'F' ) pt2d(:, 1 :jprecj) = zland !south except F-point
882	pt2d(:,nlcj-jprecj+1:jpj ) = zland ! north
883	!
884	ENDIF
885
886	! 2. East and west directions exchange
887	! ------------------------------------
888	! we play with the neigbours AND the row number because of the periodicity
889	!
890	SELECT CASE ( nbondi ) ! Read Dirichlet lateral conditions
891	CASE ( -1, 0, 1 ) ! all exept 2 (i.e. close case)
892	iihom = nlci-nreci
893	DO jl = 1, jpreci
894	zt2ew(:,jl,1) = pt2d(jpreci+jl,:)
895	zt2we(:,jl,1) = pt2d(iihom +jl,:)
896	END DO
897	END SELECT
898	!
899	! ! Migrations
900	imigr = jpreci * jpj
901	!
902	SELECT CASE ( nbondi )
903	CASE ( -1 )
904	CALL mppsend( 2, zt2we(1,1,1), imigr, noea, ml_req1 )
905	CALL mpprecv( 1, zt2ew(1,1,2), imigr, noea )
906	IF(l_isend) CALL mpi_wait(ml_req1,ml_stat,ml_err)
907	CASE ( 0 )
908	CALL mppsend( 1, zt2ew(1,1,1), imigr, nowe, ml_req1 )
909	CALL mppsend( 2, zt2we(1,1,1), imigr, noea, ml_req2 )
910	CALL mpprecv( 1, zt2ew(1,1,2), imigr, noea )
911	CALL mpprecv( 2, zt2we(1,1,2), imigr, nowe )
912	IF(l_isend) CALL mpi_wait(ml_req1,ml_stat,ml_err)
913	IF(l_isend) CALL mpi_wait(ml_req2,ml_stat,ml_err)
914	CASE ( 1 )
915	CALL mppsend( 1, zt2ew(1,1,1), imigr, nowe, ml_req1 )
916	CALL mpprecv( 2, zt2we(1,1,2), imigr, nowe )
917	IF(l_isend) CALL mpi_wait(ml_req1,ml_stat,ml_err)
918	END SELECT
919	!
920	! ! Write Dirichlet lateral conditions
921	iihom = nlci - jpreci
922	!
923	SELECT CASE ( nbondi )
924	CASE ( -1 )
925	DO jl = 1, jpreci
926	pt2d(iihom+jl,:) = zt2ew(:,jl,2)
927	END DO
928	CASE ( 0 )
929	DO jl = 1, jpreci
930	pt2d(jl ,:) = zt2we(:,jl,2)
931	pt2d(iihom+jl,:) = zt2ew(:,jl,2)
932	END DO
933	CASE ( 1 )
934	DO jl = 1, jpreci
935	pt2d(jl ,:) = zt2we(:,jl,2)
936	END DO
937	END SELECT
938
939
940	! 3. North and south directions
941	! -----------------------------
942	! always closed : we play only with the neigbours
943	!
944	IF( nbondj /= 2 ) THEN ! Read Dirichlet lateral conditions
945	ijhom = nlcj-nrecj
946	DO jl = 1, jprecj
947	zt2sn(:,jl,1) = pt2d(:,ijhom +jl)
948	zt2ns(:,jl,1) = pt2d(:,jprecj+jl)
949	END DO
950	ENDIF
951	!
952	! ! Migrations
953	imigr = jprecj * jpi
954	!
955	SELECT CASE ( nbondj )
956	CASE ( -1 )
957	CALL mppsend( 4, zt2sn(1,1,1), imigr, nono, ml_req1 )
958	CALL mpprecv( 3, zt2ns(1,1,2), imigr, nono )
959	IF(l_isend) CALL mpi_wait(ml_req1,ml_stat,ml_err)
960	CASE ( 0 )
961	CALL mppsend( 3, zt2ns(1,1,1), imigr, noso, ml_req1 )
962	CALL mppsend( 4, zt2sn(1,1,1), imigr, nono, ml_req2 )
963	CALL mpprecv( 3, zt2ns(1,1,2), imigr, nono )
964	CALL mpprecv( 4, zt2sn(1,1,2), imigr, noso )
965	IF(l_isend) CALL mpi_wait(ml_req1,ml_stat,ml_err)
966	IF(l_isend) CALL mpi_wait(ml_req2,ml_stat,ml_err)
967	CASE ( 1 )
968	CALL mppsend( 3, zt2ns(1,1,1), imigr, noso, ml_req1 )
969	CALL mpprecv( 4, zt2sn(1,1,2), imigr, noso )
970	IF(l_isend) CALL mpi_wait(ml_req1,ml_stat,ml_err)
971	END SELECT
972	!
973	! ! Write Dirichlet lateral conditions
974	ijhom = nlcj - jprecj
975	!
976	SELECT CASE ( nbondj )
977	CASE ( -1 )
978	DO jl = 1, jprecj
979	pt2d(:,ijhom+jl) = zt2ns(:,jl,2)
980	END DO
981	CASE ( 0 )
982	DO jl = 1, jprecj
983	pt2d(:,jl ) = zt2sn(:,jl,2)
984	pt2d(:,ijhom+jl) = zt2ns(:,jl,2)
985	END DO
986	CASE ( 1 )
987	DO jl = 1, jprecj
988	pt2d(:,jl ) = zt2sn(:,jl,2)
989	END DO
990	END SELECT
991
992
993	! 4. north fold treatment
994	! -----------------------
995	!
996	IF( npolj /= 0 .AND. .NOT. PRESENT(cd_mpp) ) THEN
997	!
998	SELECT CASE ( jpni )
999	CASE ( 1 ) ; CALL lbc_nfd ( pt2d, cd_type, psgn ) ! only 1 northern proc, no mpp
1000	CASE DEFAULT ; CALL mpp_lbc_north( pt2d, cd_type, psgn ) ! for all northern procs.
1001	END SELECT
1002	!
1003	ENDIF
1004	!
1005	DEALLOCATE( zt2ns, zt2sn, zt2ew, zt2we )
1006	!
1007	END SUBROUTINE mpp_lnk_2d
1008
1009
1010	SUBROUTINE mpp_lnk_3d_gather( ptab1, cd_type1, ptab2, cd_type2, psgn )
1011	!!----------------------------------------------------------------------
1012	!! * routine mpp_lnk_3d_gather *
1013	!!
1014	!! ** Purpose : Message passing manadgement for two 3D arrays
1015	!!
1016	!! ** Method : Use mppsend and mpprecv function for passing mask
1017	!! between processors following neighboring subdomains.
1018	!! domain parameters
1019	!! nlci : first dimension of the local subdomain
1020	!! nlcj : second dimension of the local subdomain
1021	!! nbondi : mark for "east-west local boundary"
1022	!! nbondj : mark for "north-south local boundary"
1023	!! noea : number for local neighboring processors
1024	!! nowe : number for local neighboring processors
1025	!! noso : number for local neighboring processors
1026	!! nono : number for local neighboring processors
1027	!!
1028	!! ** Action : ptab1 and ptab2 with update value at its periphery
1029	!!
1030	!!----------------------------------------------------------------------
1031	REAL(wp), DIMENSION(jpi,jpj,jpk), INTENT(inout) :: ptab1 ! first and second 3D array on which
1032	REAL(wp), DIMENSION(jpi,jpj,jpk), INTENT(inout) :: ptab2 ! the boundary condition is applied
1033	CHARACTER(len=1) , INTENT(in ) :: cd_type1 ! nature of ptab1 and ptab2 arrays
1034	CHARACTER(len=1) , INTENT(in ) :: cd_type2 ! i.e. grid-points = T , U , V , F or W points
1035	REAL(wp) , INTENT(in ) :: psgn ! =-1 the sign change across the north fold boundary
1036	!! ! = 1. , the sign is kept
1037	INTEGER :: jl ! dummy loop indices
1038	INTEGER :: imigr, iihom, ijhom ! temporary integers
1039	INTEGER :: ml_req1, ml_req2, ml_err ! for key_mpi_isend
1040	INTEGER, DIMENSION(MPI_STATUS_SIZE) :: ml_stat ! for key_mpi_isend
1041	!
1042	REAL(wp), DIMENSION(:,:,:,:,:), ALLOCATABLE :: zt4ns, zt4sn ! 2 x 3d for north-south & south-north
1043	REAL(wp), DIMENSION(:,:,:,:,:), ALLOCATABLE :: zt4ew, zt4we ! 2 x 3d for east-west & west-east
1044
1045	!!----------------------------------------------------------------------
1046	ALLOCATE( zt4ns(jpi,jprecj,jpk,2,2), zt4sn(jpi,jprecj,jpk,2,2) , &
1047	& zt4ew(jpj,jpreci,jpk,2,2), zt4we(jpj,jpreci,jpk,2,2) )
1048
1049
1050	! 1. standard boundary treatment
1051	! ------------------------------
1052	! ! East-West boundaries
1053	! !* Cyclic east-west
1054	IF( nbondi == 2 .AND. (nperio == 1 .OR. nperio == 4 .OR. nperio == 6) ) THEN
1055	ptab1( 1 ,:,:) = ptab1(jpim1,:,:)
1056	ptab1(jpi,:,:) = ptab1( 2 ,:,:)
1057	ptab2( 1 ,:,:) = ptab2(jpim1,:,:)
1058	ptab2(jpi,:,:) = ptab2( 2 ,:,:)
1059	ELSE !* closed
1060	IF( .NOT. cd_type1 == 'F' ) ptab1( 1 :jpreci,:,:) = 0.e0 ! south except at F-point
1061	IF( .NOT. cd_type2 == 'F' ) ptab2( 1 :jpreci,:,:) = 0.e0
1062	ptab1(nlci-jpreci+1:jpi ,:,:) = 0.e0 ! north
1063	ptab2(nlci-jpreci+1:jpi ,:,:) = 0.e0
1064	ENDIF
1065
1066
1067	! ! North-South boundaries
1068	IF( .NOT. cd_type1 == 'F' ) ptab1(:, 1 :jprecj,:) = 0.e0 ! south except at F-point
1069	IF( .NOT. cd_type2 == 'F' ) ptab2(:, 1 :jprecj,:) = 0.e0
1070	ptab1(:,nlcj-jprecj+1:jpj ,:) = 0.e0 ! north
1071	ptab2(:,nlcj-jprecj+1:jpj ,:) = 0.e0
1072
1073
1074	! 2. East and west directions exchange
1075	! ------------------------------------
1076	! we play with the neigbours AND the row number because of the periodicity
1077	!
1078	SELECT CASE ( nbondi ) ! Read Dirichlet lateral conditions
1079	CASE ( -1, 0, 1 ) ! all exept 2 (i.e. close case)
1080	iihom = nlci-nreci
1081	DO jl = 1, jpreci
1082	zt4ew(:,jl,:,1,1) = ptab1(jpreci+jl,:,:)
1083	zt4we(:,jl,:,1,1) = ptab1(iihom +jl,:,:)
1084	zt4ew(:,jl,:,2,1) = ptab2(jpreci+jl,:,:)
1085	zt4we(:,jl,:,2,1) = ptab2(iihom +jl,:,:)
1086	END DO
1087	END SELECT
1088	!
1089	! ! Migrations
1090	imigr = jpreci * jpj * jpk *2
1091	!
1092	SELECT CASE ( nbondi )
1093	CASE ( -1 )
1094	CALL mppsend( 2, zt4we(1,1,1,1,1), imigr, noea, ml_req1 )
1095	CALL mpprecv( 1, zt4ew(1,1,1,1,2), imigr, noea )
1096	IF(l_isend) CALL mpi_wait(ml_req1, ml_stat, ml_err)
1097	CASE ( 0 )
1098	CALL mppsend( 1, zt4ew(1,1,1,1,1), imigr, nowe, ml_req1 )
1099	CALL mppsend( 2, zt4we(1,1,1,1,1), imigr, noea, ml_req2 )
1100	CALL mpprecv( 1, zt4ew(1,1,1,1,2), imigr, noea )
1101	CALL mpprecv( 2, zt4we(1,1,1,1,2), imigr, nowe )
1102	IF(l_isend) CALL mpi_wait(ml_req1, ml_stat, ml_err)
1103	IF(l_isend) CALL mpi_wait(ml_req2, ml_stat, ml_err)
1104	CASE ( 1 )
1105	CALL mppsend( 1, zt4ew(1,1,1,1,1), imigr, nowe, ml_req1 )
1106	CALL mpprecv( 2, zt4we(1,1,1,1,2), imigr, nowe )
1107	IF(l_isend) CALL mpi_wait(ml_req1, ml_stat, ml_err)
1108	END SELECT
1109	!
1110	! ! Write Dirichlet lateral conditions
1111	iihom = nlci - jpreci
1112	!
1113	SELECT CASE ( nbondi )
1114	CASE ( -1 )
1115	DO jl = 1, jpreci
1116	ptab1(iihom+jl,:,:) = zt4ew(:,jl,:,1,2)
1117	ptab2(iihom+jl,:,:) = zt4ew(:,jl,:,2,2)
1118	END DO
1119	CASE ( 0 )
1120	DO jl = 1, jpreci
1121	ptab1(jl ,:,:) = zt4we(:,jl,:,1,2)
1122	ptab1(iihom+jl,:,:) = zt4ew(:,jl,:,1,2)
1123	ptab2(jl ,:,:) = zt4we(:,jl,:,2,2)
1124	ptab2(iihom+jl,:,:) = zt4ew(:,jl,:,2,2)
1125	END DO
1126	CASE ( 1 )
1127	DO jl = 1, jpreci
1128	ptab1(jl ,:,:) = zt4we(:,jl,:,1,2)
1129	ptab2(jl ,:,:) = zt4we(:,jl,:,2,2)
1130	END DO
1131	END SELECT
1132
1133
1134	! 3. North and south directions
1135	! -----------------------------
1136	! always closed : we play only with the neigbours
1137	!
1138	IF( nbondj /= 2 ) THEN ! Read Dirichlet lateral conditions
1139	ijhom = nlcj - nrecj
1140	DO jl = 1, jprecj
1141	zt4sn(:,jl,:,1,1) = ptab1(:,ijhom +jl,:)
1142	zt4ns(:,jl,:,1,1) = ptab1(:,jprecj+jl,:)
1143	zt4sn(:,jl,:,2,1) = ptab2(:,ijhom +jl,:)
1144	zt4ns(:,jl,:,2,1) = ptab2(:,jprecj+jl,:)
1145	END DO
1146	ENDIF
1147	!
1148	! ! Migrations
1149	imigr = jprecj * jpi * jpk * 2
1150	!
1151	SELECT CASE ( nbondj )
1152	CASE ( -1 )
1153	CALL mppsend( 4, zt4sn(1,1,1,1,1), imigr, nono, ml_req1 )
1154	CALL mpprecv( 3, zt4ns(1,1,1,1,2), imigr, nono )
1155	IF(l_isend) CALL mpi_wait(ml_req1, ml_stat, ml_err)
1156	CASE ( 0 )
1157	CALL mppsend( 3, zt4ns(1,1,1,1,1), imigr, noso, ml_req1 )
1158	CALL mppsend( 4, zt4sn(1,1,1,1,1), imigr, nono, ml_req2 )
1159	CALL mpprecv( 3, zt4ns(1,1,1,1,2), imigr, nono )
1160	CALL mpprecv( 4, zt4sn(1,1,1,1,2), imigr, noso )
1161	IF(l_isend) CALL mpi_wait(ml_req1, ml_stat, ml_err)
1162	IF(l_isend) CALL mpi_wait(ml_req2, ml_stat, ml_err)
1163	CASE ( 1 )
1164	CALL mppsend( 3, zt4ns(1,1,1,1,1), imigr, noso, ml_req1 )
1165	CALL mpprecv( 4, zt4sn(1,1,1,1,2), imigr, noso )
1166	IF(l_isend) CALL mpi_wait(ml_req1, ml_stat, ml_err)
1167	END SELECT
1168	!
1169	! ! Write Dirichlet lateral conditions
1170	ijhom = nlcj - jprecj
1171	!
1172	SELECT CASE ( nbondj )
1173	CASE ( -1 )
1174	DO jl = 1, jprecj
1175	ptab1(:,ijhom+jl,:) = zt4ns(:,jl,:,1,2)
1176	ptab2(:,ijhom+jl,:) = zt4ns(:,jl,:,2,2)
1177	END DO
1178	CASE ( 0 )
1179	DO jl = 1, jprecj
1180	ptab1(:,jl ,:) = zt4sn(:,jl,:,1,2)
1181	ptab1(:,ijhom+jl,:) = zt4ns(:,jl,:,1,2)
1182	ptab2(:,jl ,:) = zt4sn(:,jl,:,2,2)
1183	ptab2(:,ijhom+jl,:) = zt4ns(:,jl,:,2,2)
1184	END DO
1185	CASE ( 1 )
1186	DO jl = 1, jprecj
1187	ptab1(:,jl,:) = zt4sn(:,jl,:,1,2)
1188	ptab2(:,jl,:) = zt4sn(:,jl,:,2,2)
1189	END DO
1190	END SELECT
1191
1192
1193	! 4. north fold treatment
1194	! -----------------------
1195	IF( npolj /= 0 ) THEN
1196	!
1197	SELECT CASE ( jpni )
1198	CASE ( 1 )
1199	CALL lbc_nfd ( ptab1, cd_type1, psgn ) ! only for northern procs.
1200	CALL lbc_nfd ( ptab2, cd_type2, psgn )
1201	CASE DEFAULT
1202	CALL mpp_lbc_north( ptab1, cd_type1, psgn ) ! for all northern procs.
1203	CALL mpp_lbc_north (ptab2, cd_type2, psgn)
1204	END SELECT
1205	!
1206	ENDIF
1207	!
1208	DEALLOCATE( zt4ns, zt4sn, zt4ew, zt4we )
1209	!
1210	END SUBROUTINE mpp_lnk_3d_gather
1211
1212
1213	SUBROUTINE mpp_lnk_2d_e( pt2d, cd_type, psgn, jpri, jprj )
1214	!!----------------------------------------------------------------------
1215	!! * routine mpp_lnk_2d_e *
1216	!!
1217	!! ** Purpose : Message passing manadgement for 2d array (with halo)
1218	!!
1219	!! ** Method : Use mppsend and mpprecv function for passing mask
1220	!! between processors following neighboring subdomains.
1221	!! domain parameters
1222	!! nlci : first dimension of the local subdomain
1223	!! nlcj : second dimension of the local subdomain
1224	!! jpri : number of rows for extra outer halo
1225	!! jprj : number of columns for extra outer halo
1226	!! nbondi : mark for "east-west local boundary"
1227	!! nbondj : mark for "north-south local boundary"
1228	!! noea : number for local neighboring processors
1229	!! nowe : number for local neighboring processors
1230	!! noso : number for local neighboring processors
1231	!! nono : number for local neighboring processors
1232	!!
1233	!!----------------------------------------------------------------------
1234	INTEGER , INTENT(in ) :: jpri
1235	INTEGER , INTENT(in ) :: jprj
1236	REAL(wp), DIMENSION(1-jpri:jpi+jpri,1-jprj:jpj+jprj), INTENT(inout) :: pt2d ! 2D array with extra halo
1237	CHARACTER(len=1) , INTENT(in ) :: cd_type ! nature of ptab array grid-points
1238	! ! = T , U , V , F , W and I points
1239	REAL(wp) , INTENT(in ) :: psgn ! =-1 the sign change across the
1240	!! ! north boundary, = 1. otherwise
1241	INTEGER :: jl ! dummy loop indices
1242	INTEGER :: imigr, iihom, ijhom ! temporary integers
1243	INTEGER :: ipreci, iprecj ! temporary integers
1244	INTEGER :: ml_req1, ml_req2, ml_err ! for key_mpi_isend
1245	INTEGER, DIMENSION(MPI_STATUS_SIZE) :: ml_stat ! for key_mpi_isend
1246	!!
1247	REAL(wp), DIMENSION(1-jpri:jpi+jpri,jprecj+jprj,2) :: r2dns
1248	REAL(wp), DIMENSION(1-jpri:jpi+jpri,jprecj+jprj,2) :: r2dsn
1249	REAL(wp), DIMENSION(1-jprj:jpj+jprj,jpreci+jpri,2) :: r2dwe
1250	REAL(wp), DIMENSION(1-jprj:jpj+jprj,jpreci+jpri,2) :: r2dew
1251	!!----------------------------------------------------------------------
1252
1253	ipreci = jpreci + jpri ! take into account outer extra 2D overlap area
1254	iprecj = jprecj + jprj
1255
1256
1257	! 1. standard boundary treatment
1258	! ------------------------------
1259	! Order matters Here !!!!
1260	!
1261	! !* North-South boundaries (always colsed)
1262	IF( .NOT. cd_type == 'F' ) pt2d(:, 1-jprj : jprecj ) = 0.e0 ! south except at F-point
1263	pt2d(:,nlcj-jprecj+1:jpj+jprj) = 0.e0 ! north
1264
1265	! ! East-West boundaries
1266	! !* Cyclic east-west
1267	IF( nbondi == 2 .AND. (nperio == 1 .OR. nperio == 4 .OR. nperio == 6) ) THEN
1268	pt2d(1-jpri: 1 ,:) = pt2d(jpim1-jpri: jpim1 ,:) ! east
1269	pt2d( jpi :jpi+jpri,:) = pt2d( 2 :2+jpri,:) ! west
1270	!
1271	ELSE !* closed
1272	IF( .NOT. cd_type == 'F' ) pt2d( 1-jpri :jpreci ,:) = 0.e0 ! south except at F-point
1273	pt2d(nlci-jpreci+1:jpi+jpri,:) = 0.e0 ! north
1274	ENDIF
1275	!
1276
1277	! north fold treatment
1278	! -----------------------
1279	IF( npolj /= 0 ) THEN
1280	!
1281	SELECT CASE ( jpni )
1282	CASE ( 1 ) ; CALL lbc_nfd ( pt2d(1:jpi,1:jpj+jprj), cd_type, psgn, pr2dj=jprj )
1283	CASE DEFAULT ; CALL mpp_lbc_north_e( pt2d , cd_type, psgn )
1284	END SELECT
1285	!
1286	ENDIF
1287
1288	! 2. East and west directions exchange
1289	! ------------------------------------
1290	! we play with the neigbours AND the row number because of the periodicity
1291	!
1292	SELECT CASE ( nbondi ) ! Read Dirichlet lateral conditions
1293	CASE ( -1, 0, 1 ) ! all exept 2 (i.e. close case)
1294	iihom = nlci-nreci-jpri
1295	DO jl = 1, ipreci
1296	r2dew(:,jl,1) = pt2d(jpreci+jl,:)
1297	r2dwe(:,jl,1) = pt2d(iihom +jl,:)
1298	END DO
1299	END SELECT
1300	!
1301	! ! Migrations
1302	imigr = ipreci * ( jpj + 2*jprj)
1303	!
1304	SELECT CASE ( nbondi )
1305	CASE ( -1 )
1306	CALL mppsend( 2, r2dwe(1-jprj,1,1), imigr, noea, ml_req1 )
1307	CALL mpprecv( 1, r2dew(1-jprj,1,2), imigr, noea )
1308	IF(l_isend) CALL mpi_wait(ml_req1,ml_stat,ml_err)
1309	CASE ( 0 )
1310	CALL mppsend( 1, r2dew(1-jprj,1,1), imigr, nowe, ml_req1 )
1311	CALL mppsend( 2, r2dwe(1-jprj,1,1), imigr, noea, ml_req2 )
1312	CALL mpprecv( 1, r2dew(1-jprj,1,2), imigr, noea )
1313	CALL mpprecv( 2, r2dwe(1-jprj,1,2), imigr, nowe )
1314	IF(l_isend) CALL mpi_wait(ml_req1,ml_stat,ml_err)
1315	IF(l_isend) CALL mpi_wait(ml_req2,ml_stat,ml_err)
1316	CASE ( 1 )
1317	CALL mppsend( 1, r2dew(1-jprj,1,1), imigr, nowe, ml_req1 )
1318	CALL mpprecv( 2, r2dwe(1-jprj,1,2), imigr, nowe )
1319	IF(l_isend) CALL mpi_wait(ml_req1,ml_stat,ml_err)
1320	END SELECT
1321	!
1322	! ! Write Dirichlet lateral conditions
1323	iihom = nlci - jpreci
1324	!
1325	SELECT CASE ( nbondi )
1326	CASE ( -1 )
1327	DO jl = 1, ipreci
1328	pt2d(iihom+jl,:) = r2dew(:,jl,2)
1329	END DO
1330	CASE ( 0 )
1331	DO jl = 1, ipreci
1332	pt2d(jl-jpri,:) = r2dwe(:,jl,2)
1333	pt2d( iihom+jl,:) = r2dew(:,jl,2)
1334	END DO
1335	CASE ( 1 )
1336	DO jl = 1, ipreci
1337	pt2d(jl-jpri,:) = r2dwe(:,jl,2)
1338	END DO
1339	END SELECT
1340
1341
1342	! 3. North and south directions
1343	! -----------------------------
1344	! always closed : we play only with the neigbours
1345	!
1346	IF( nbondj /= 2 ) THEN ! Read Dirichlet lateral conditions
1347	ijhom = nlcj-nrecj-jprj
1348	DO jl = 1, iprecj
1349	r2dsn(:,jl,1) = pt2d(:,ijhom +jl)
1350	r2dns(:,jl,1) = pt2d(:,jprecj+jl)
1351	END DO
1352	ENDIF
1353	!
1354	! ! Migrations
1355	imigr = iprecj * ( jpi + 2*jpri )
1356	!
1357	SELECT CASE ( nbondj )
1358	CASE ( -1 )
1359	CALL mppsend( 4, r2dsn(1-jpri,1,1), imigr, nono, ml_req1 )
1360	CALL mpprecv( 3, r2dns(1-jpri,1,2), imigr, nono )
1361	IF(l_isend) CALL mpi_wait(ml_req1,ml_stat,ml_err)
1362	CASE ( 0 )
1363	CALL mppsend( 3, r2dns(1-jpri,1,1), imigr, noso, ml_req1 )
1364	CALL mppsend( 4, r2dsn(1-jpri,1,1), imigr, nono, ml_req2 )
1365	CALL mpprecv( 3, r2dns(1-jpri,1,2), imigr, nono )
1366	CALL mpprecv( 4, r2dsn(1-jpri,1,2), imigr, noso )
1367	IF(l_isend) CALL mpi_wait(ml_req1,ml_stat,ml_err)
1368	IF(l_isend) CALL mpi_wait(ml_req2,ml_stat,ml_err)
1369	CASE ( 1 )
1370	CALL mppsend( 3, r2dns(1-jpri,1,1), imigr, noso, ml_req1 )
1371	CALL mpprecv( 4, r2dsn(1-jpri,1,2), imigr, noso )
1372	IF(l_isend) CALL mpi_wait(ml_req1,ml_stat,ml_err)
1373	END SELECT
1374	!
1375	! ! Write Dirichlet lateral conditions
1376	ijhom = nlcj - jprecj
1377	!
1378	SELECT CASE ( nbondj )
1379	CASE ( -1 )
1380	DO jl = 1, iprecj
1381	pt2d(:,ijhom+jl) = r2dns(:,jl,2)
1382	END DO
1383	CASE ( 0 )
1384	DO jl = 1, iprecj
1385	pt2d(:,jl-jprj) = r2dsn(:,jl,2)
1386	pt2d(:,ijhom+jl ) = r2dns(:,jl,2)
1387	END DO
1388	CASE ( 1 )
1389	DO jl = 1, iprecj
1390	pt2d(:,jl-jprj) = r2dsn(:,jl,2)
1391	END DO
1392	END SELECT
1393
1394	END SUBROUTINE mpp_lnk_2d_e
1395
1396
1397	SUBROUTINE mppsend( ktyp, pmess, kbytes, kdest, md_req )
1398	!!----------------------------------------------------------------------
1399	!! * routine mppsend *
1400	!!
1401	!! ** Purpose : Send messag passing array
1402	!!
1403	!!----------------------------------------------------------------------
1404	REAL(wp), INTENT(inout) :: pmess(*) ! array of real
1405	INTEGER , INTENT(in ) :: kbytes ! size of the array pmess
1406	INTEGER , INTENT(in ) :: kdest ! receive process number
1407	INTEGER , INTENT(in ) :: ktyp ! tag of the message
1408	INTEGER , INTENT(in ) :: md_req ! argument for isend
1409	!!
1410	INTEGER :: iflag
1411	!!----------------------------------------------------------------------
1412	!
1413	SELECT CASE ( cn_mpi_send )
1414	CASE ( 'S' ) ! Standard mpi send (blocking)
1415	CALL mpi_send ( pmess, kbytes, mpi_double_precision, kdest , ktyp, mpi_comm_opa , iflag )
1416	CASE ( 'B' ) ! Buffer mpi send (blocking)
1417	CALL mpi_bsend( pmess, kbytes, mpi_double_precision, kdest , ktyp, mpi_comm_opa , iflag )
1418	CASE ( 'I' ) ! Immediate mpi send (non-blocking send)
1419	! be carefull, one more argument here : the mpi request identifier..
1420	CALL mpi_isend( pmess, kbytes, mpi_double_precision, kdest , ktyp, mpi_comm_opa, md_req, iflag )
1421	END SELECT
1422	!
1423	END SUBROUTINE mppsend
1424
1425
1426	SUBROUTINE mpprecv( ktyp, pmess, kbytes, ksource )
1427	!!----------------------------------------------------------------------
1428	!! * routine mpprecv *
1429	!!
1430	!! ** Purpose : Receive messag passing array
1431	!!
1432	!!----------------------------------------------------------------------
1433	REAL(wp), INTENT(inout) :: pmess(*) ! array of real
1434	INTEGER , INTENT(in ) :: kbytes ! suze of the array pmess
1435	INTEGER , INTENT(in ) :: ktyp ! Tag of the recevied message
1436	INTEGER, OPTIONAL, INTENT(in) :: ksource ! source process number
1437	!!
1438	INTEGER :: istatus(mpi_status_size)
1439	INTEGER :: iflag
1440	INTEGER :: use_source
1441	!!----------------------------------------------------------------------
1442	!
1443
1444	! If a specific process number has been passed to the receive call,
1445	! use that one. Default is to use mpi_any_source
1446	use_source=mpi_any_source
1447	if(present(ksource)) then
1448	use_source=ksource
1449	end if
1450
1451	CALL mpi_recv( pmess, kbytes, mpi_double_precision, use_source, ktyp, mpi_comm_opa, istatus, iflag )
1452	!
1453	END SUBROUTINE mpprecv
1454
1455
1456	SUBROUTINE mppgather( ptab, kp, pio )
1457	!!----------------------------------------------------------------------
1458	!! * routine mppgather *
1459	!!
1460	!! ** Purpose : Transfert between a local subdomain array and a work
1461	!! array which is distributed following the vertical level.
1462	!!
1463	!!----------------------------------------------------------------------
1464	REAL(wp), DIMENSION(jpi,jpj), INTENT(in ) :: ptab ! subdomain input array
1465	INTEGER , INTENT(in ) :: kp ! record length
1466	REAL(wp), DIMENSION(jpi,jpj,jpnij), INTENT( out) :: pio ! subdomain input array
1467	!!
1468	INTEGER :: itaille, ierror ! temporary integer
1469	!!---------------------------------------------------------------------
1470	!
1471	itaille = jpi * jpj
1472	CALL mpi_gather( ptab, itaille, mpi_double_precision, pio, itaille , &
1473	& mpi_double_precision, kp , mpi_comm_opa, ierror )
1474	!
1475	END SUBROUTINE mppgather
1476
1477
1478	SUBROUTINE mppscatter( pio, kp, ptab )
1479	!!----------------------------------------------------------------------
1480	!! * routine mppscatter *
1481	!!
1482	!! ** Purpose : Transfert between awork array which is distributed
1483	!! following the vertical level and the local subdomain array.
1484	!!
1485	!!----------------------------------------------------------------------
1486	REAL(wp), DIMENSION(jpi,jpj,jpnij) :: pio ! output array
1487	INTEGER :: kp ! Tag (not used with MPI
1488	REAL(wp), DIMENSION(jpi,jpj) :: ptab ! subdomain array input
1489	!!
1490	INTEGER :: itaille, ierror ! temporary integer
1491	!!---------------------------------------------------------------------
1492	!
1493	itaille=jpi*jpj
1494	!
1495	CALL mpi_scatter( pio, itaille, mpi_double_precision, ptab, itaille , &
1496	& mpi_double_precision, kp , mpi_comm_opa, ierror )
1497	!
1498	END SUBROUTINE mppscatter
1499
1500
1501	SUBROUTINE mppmax_a_int( ktab, kdim, kcom )
1502	!!----------------------------------------------------------------------
1503	!! * routine mppmax_a_int *
1504	!!
1505	!! ** Purpose : Find maximum value in an integer layout array
1506	!!
1507	!!----------------------------------------------------------------------
1508	INTEGER , INTENT(in ) :: kdim ! size of array
1509	INTEGER , INTENT(inout), DIMENSION(kdim) :: ktab ! input array
1510	INTEGER , INTENT(in ), OPTIONAL :: kcom !
1511	!!
1512	INTEGER :: ierror, localcomm ! temporary integer
1513	INTEGER, DIMENSION(kdim) :: iwork
1514	!!----------------------------------------------------------------------
1515	!
1516	localcomm = mpi_comm_opa
1517	IF( PRESENT(kcom) ) localcomm = kcom
1518	!
1519	CALL mpi_allreduce( ktab, iwork, kdim, mpi_integer, mpi_max, localcomm, ierror )
1520	!
1521	ktab(:) = iwork(:)
1522	!
1523	END SUBROUTINE mppmax_a_int
1524
1525
1526	SUBROUTINE mppmax_int( ktab, kcom )
1527	!!----------------------------------------------------------------------
1528	!! * routine mppmax_int *
1529	!!
1530	!! ** Purpose : Find maximum value in an integer layout array
1531	!!
1532	!!----------------------------------------------------------------------
1533	INTEGER, INTENT(inout) :: ktab ! ???
1534	INTEGER, INTENT(in ), OPTIONAL :: kcom ! ???
1535	!!
1536	INTEGER :: ierror, iwork, localcomm ! temporary integer
1537	!!----------------------------------------------------------------------
1538	!
1539	localcomm = mpi_comm_opa
1540	IF( PRESENT(kcom) ) localcomm = kcom
1541	!
1542	CALL mpi_allreduce( ktab, iwork, 1, mpi_integer, mpi_max, localcomm, ierror)
1543	!
1544	ktab = iwork
1545	!
1546	END SUBROUTINE mppmax_int
1547
1548
1549	SUBROUTINE mppmin_a_int( ktab, kdim, kcom )
1550	!!----------------------------------------------------------------------
1551	!! * routine mppmin_a_int *
1552	!!
1553	!! ** Purpose : Find minimum value in an integer layout array
1554	!!
1555	!!----------------------------------------------------------------------
1556	INTEGER , INTENT( in ) :: kdim ! size of array
1557	INTEGER , INTENT(inout), DIMENSION(kdim) :: ktab ! input array
1558	INTEGER , INTENT( in ), OPTIONAL :: kcom ! input array
1559	!!
1560	INTEGER :: ierror, localcomm ! temporary integer
1561	INTEGER, DIMENSION(kdim) :: iwork
1562	!!----------------------------------------------------------------------
1563	!
1564	localcomm = mpi_comm_opa
1565	IF( PRESENT(kcom) ) localcomm = kcom
1566	!
1567	CALL mpi_allreduce( ktab, iwork, kdim, mpi_integer, mpi_min, localcomm, ierror )
1568	!
1569	ktab(:) = iwork(:)
1570	!
1571	END SUBROUTINE mppmin_a_int
1572
1573
1574	SUBROUTINE mppmin_int( ktab, kcom )
1575	!!----------------------------------------------------------------------
1576	!! * routine mppmin_int *
1577	!!
1578	!! ** Purpose : Find minimum value in an integer layout array
1579	!!
1580	!!----------------------------------------------------------------------
1581	INTEGER, INTENT(inout) :: ktab ! ???
1582	INTEGER , INTENT( in ), OPTIONAL :: kcom ! input array
1583	!!
1584	INTEGER :: ierror, iwork, localcomm
1585	!!----------------------------------------------------------------------
1586	!
1587	localcomm = mpi_comm_opa
1588	IF( PRESENT(kcom) ) localcomm = kcom
1589	!
1590	CALL mpi_allreduce( ktab, iwork, 1, mpi_integer, mpi_min, localcomm, ierror )
1591	!
1592	ktab = iwork
1593	!
1594	END SUBROUTINE mppmin_int
1595
1596
1597	SUBROUTINE mppsum_a_int( ktab, kdim )
1598	!!----------------------------------------------------------------------
1599	!! * routine mppsum_a_int *
1600	!!
1601	!! ** Purpose : Global integer sum, 1D array case
1602	!!
1603	!!----------------------------------------------------------------------
1604	INTEGER, INTENT(in ) :: kdim ! ???
1605	INTEGER, INTENT(inout), DIMENSION (kdim) :: ktab ! ???
1606	!!
1607	INTEGER :: ierror
1608	INTEGER, DIMENSION (kdim) :: iwork
1609	!!----------------------------------------------------------------------
1610	!
1611	CALL mpi_allreduce( ktab, iwork, kdim, mpi_integer, mpi_sum, mpi_comm_opa, ierror )
1612	!
1613	ktab(:) = iwork(:)
1614	!
1615	END SUBROUTINE mppsum_a_int
1616
1617
1618	SUBROUTINE mppsum_int( ktab )
1619	!!----------------------------------------------------------------------
1620	!! * routine mppsum_int *
1621	!!
1622	!! ** Purpose : Global integer sum
1623	!!
1624	!!----------------------------------------------------------------------
1625	INTEGER, INTENT(inout) :: ktab
1626	!!
1627	INTEGER :: ierror, iwork
1628	!!----------------------------------------------------------------------
1629	!
1630	CALL mpi_allreduce( ktab, iwork, 1, mpi_integer, mpi_sum, mpi_comm_opa, ierror )
1631	!
1632	ktab = iwork
1633	!
1634	END SUBROUTINE mppsum_int
1635
1636
1637	SUBROUTINE mppmax_a_real( ptab, kdim, kcom )
1638	!!----------------------------------------------------------------------
1639	!! * routine mppmax_a_real *
1640	!!
1641	!! ** Purpose : Maximum
1642	!!
1643	!!----------------------------------------------------------------------
1644	INTEGER , INTENT(in ) :: kdim
1645	REAL(wp), INTENT(inout), DIMENSION(kdim) :: ptab
1646	INTEGER , INTENT(in ), OPTIONAL :: kcom
1647	!!
1648	INTEGER :: ierror, localcomm
1649	REAL(wp), DIMENSION(kdim) :: zwork
1650	!!----------------------------------------------------------------------
1651	!
1652	localcomm = mpi_comm_opa
1653	IF( PRESENT(kcom) ) localcomm = kcom
1654	!
1655	CALL mpi_allreduce( ptab, zwork, kdim, mpi_double_precision, mpi_max, localcomm, ierror )
1656	ptab(:) = zwork(:)
1657	!
1658	END SUBROUTINE mppmax_a_real
1659
1660
1661	SUBROUTINE mppmax_real( ptab, kcom )
1662	!!----------------------------------------------------------------------
1663	!! * routine mppmax_real *
1664	!!
1665	!! ** Purpose : Maximum
1666	!!
1667	!!----------------------------------------------------------------------
1668	REAL(wp), INTENT(inout) :: ptab ! ???
1669	INTEGER , INTENT(in ), OPTIONAL :: kcom ! ???
1670	!!
1671	INTEGER :: ierror, localcomm
1672	REAL(wp) :: zwork
1673	!!----------------------------------------------------------------------
1674	!
1675	localcomm = mpi_comm_opa
1676	IF( PRESENT(kcom) ) localcomm = kcom
1677	!
1678	CALL mpi_allreduce( ptab, zwork, 1, mpi_double_precision, mpi_max, localcomm, ierror )
1679	ptab = zwork
1680	!
1681	END SUBROUTINE mppmax_real
1682
1683
1684	SUBROUTINE mppmin_a_real( ptab, kdim, kcom )
1685	!!----------------------------------------------------------------------
1686	!! * routine mppmin_a_real *
1687	!!
1688	!! ** Purpose : Minimum of REAL, array case
1689	!!
1690	!!-----------------------------------------------------------------------
1691	INTEGER , INTENT(in ) :: kdim
1692	REAL(wp), INTENT(inout), DIMENSION(kdim) :: ptab
1693	INTEGER , INTENT(in ), OPTIONAL :: kcom
1694	!!
1695	INTEGER :: ierror, localcomm
1696	REAL(wp), DIMENSION(kdim) :: zwork
1697	!!-----------------------------------------------------------------------
1698	!
1699	localcomm = mpi_comm_opa
1700	IF( PRESENT(kcom) ) localcomm = kcom
1701	!
1702	CALL mpi_allreduce( ptab, zwork, kdim, mpi_double_precision, mpi_min, localcomm, ierror )
1703	ptab(:) = zwork(:)
1704	!
1705	END SUBROUTINE mppmin_a_real
1706
1707
1708	SUBROUTINE mppmin_real( ptab, kcom )
1709	!!----------------------------------------------------------------------
1710	!! * routine mppmin_real *
1711	!!
1712	!! ** Purpose : minimum of REAL, scalar case
1713	!!
1714	!!-----------------------------------------------------------------------
1715	REAL(wp), INTENT(inout) :: ptab !
1716	INTEGER , INTENT(in ), OPTIONAL :: kcom
1717	!!
1718	INTEGER :: ierror
1719	REAL(wp) :: zwork
1720	INTEGER :: localcomm
1721	!!-----------------------------------------------------------------------
1722	!
1723	localcomm = mpi_comm_opa
1724	IF( PRESENT(kcom) ) localcomm = kcom
1725	!
1726	CALL mpi_allreduce( ptab, zwork, 1, mpi_double_precision, mpi_min, localcomm, ierror )
1727	ptab = zwork
1728	!
1729	END SUBROUTINE mppmin_real
1730
1731
1732	SUBROUTINE mppsum_a_real( ptab, kdim, kcom )
1733	!!----------------------------------------------------------------------
1734	!! * routine mppsum_a_real *
1735	!!
1736	!! ** Purpose : global sum, REAL ARRAY argument case
1737	!!
1738	!!-----------------------------------------------------------------------
1739	INTEGER , INTENT( in ) :: kdim ! size of ptab
1740	REAL(wp), DIMENSION(kdim), INTENT( inout ) :: ptab ! input array
1741	INTEGER , INTENT( in ), OPTIONAL :: kcom
1742	!!
1743	INTEGER :: ierror ! temporary integer
1744	INTEGER :: localcomm
1745	REAL(wp), DIMENSION(kdim) :: zwork ! temporary workspace
1746	!!-----------------------------------------------------------------------
1747	!
1748	localcomm = mpi_comm_opa
1749	IF( PRESENT(kcom) ) localcomm = kcom
1750	!
1751	CALL mpi_allreduce( ptab, zwork, kdim, mpi_double_precision, mpi_sum, localcomm, ierror )
1752	ptab(:) = zwork(:)
1753	!
1754	END SUBROUTINE mppsum_a_real
1755
1756
1757	SUBROUTINE mppsum_real( ptab, kcom )
1758	!!----------------------------------------------------------------------
1759	!! * routine mppsum_real *
1760	!!
1761	!! ** Purpose : global sum, SCALAR argument case
1762	!!
1763	!!-----------------------------------------------------------------------
1764	REAL(wp), INTENT(inout) :: ptab ! input scalar
1765	INTEGER , INTENT(in ), OPTIONAL :: kcom
1766	!!
1767	INTEGER :: ierror, localcomm
1768	REAL(wp) :: zwork
1769	!!-----------------------------------------------------------------------
1770	!
1771	localcomm = mpi_comm_opa
1772	IF( PRESENT(kcom) ) localcomm = kcom
1773	!
1774	CALL mpi_allreduce( ptab, zwork, 1, mpi_double_precision, mpi_sum, localcomm, ierror )
1775	ptab = zwork
1776	!
1777	END SUBROUTINE mppsum_real
1778
1779	SUBROUTINE mppsum_realdd( ytab, kcom )
1780	!!----------------------------------------------------------------------
1781	!! * routine mppsum_realdd *
1782	!!
1783	!! ** Purpose : global sum in Massively Parallel Processing
1784	!! SCALAR argument case for double-double precision
1785	!!
1786	!!-----------------------------------------------------------------------
1787	COMPLEX(wp), INTENT(inout) :: ytab ! input scalar
1788	INTEGER , INTENT( in ), OPTIONAL :: kcom
1789
1790	!! * Local variables (MPI version)
1791	INTEGER :: ierror
1792	INTEGER :: localcomm
1793	COMPLEX(wp) :: zwork
1794
1795	localcomm = mpi_comm_opa
1796	IF( PRESENT(kcom) ) localcomm = kcom
1797
1798	! reduce local sums into global sum
1799	CALL MPI_ALLREDUCE (ytab, zwork, 1, MPI_DOUBLE_COMPLEX, &
1800	MPI_SUMDD,localcomm,ierror)
1801	ytab = zwork
1802
1803	END SUBROUTINE mppsum_realdd
1804
1805
1806	SUBROUTINE mppsum_a_realdd( ytab, kdim, kcom )
1807	!!----------------------------------------------------------------------
1808	!! * routine mppsum_a_realdd *
1809	!!
1810	!! ** Purpose : global sum in Massively Parallel Processing
1811	!! COMPLEX ARRAY case for double-double precision
1812	!!
1813	!!-----------------------------------------------------------------------
1814	INTEGER , INTENT( in ) :: kdim ! size of ytab
1815	COMPLEX(wp), DIMENSION(kdim), INTENT( inout ) :: ytab ! input array
1816	INTEGER , INTENT( in ), OPTIONAL :: kcom
1817
1818	!! * Local variables (MPI version)
1819	INTEGER :: ierror ! temporary integer
1820	INTEGER :: localcomm
1821	COMPLEX(wp), DIMENSION(kdim) :: zwork ! temporary workspace
1822
1823	localcomm = mpi_comm_opa
1824	IF( PRESENT(kcom) ) localcomm = kcom
1825
1826	CALL MPI_ALLREDUCE (ytab, zwork, kdim, MPI_DOUBLE_COMPLEX, &
1827	MPI_SUMDD,localcomm,ierror)
1828	ytab(:) = zwork(:)
1829
1830	END SUBROUTINE mppsum_a_realdd
1831
1832	SUBROUTINE mpp_minloc2d( ptab, pmask, pmin, ki,kj )
1833	!!------------------------------------------------------------------------
1834	!! * routine mpp_minloc *
1835	!!
1836	!! ** Purpose : Compute the global minimum of an array ptab
1837	!! and also give its global position
1838	!!
1839	!! ** Method : Use MPI_ALLREDUCE with MPI_MINLOC
1840	!!
1841	!!--------------------------------------------------------------------------
1842	REAL(wp), DIMENSION (jpi,jpj), INTENT(in ) :: ptab ! Local 2D array
1843	REAL(wp), DIMENSION (jpi,jpj), INTENT(in ) :: pmask ! Local mask
1844	REAL(wp) , INTENT( out) :: pmin ! Global minimum of ptab
1845	INTEGER , INTENT( out) :: ki, kj ! index of minimum in global frame
1846	!!
1847	INTEGER , DIMENSION(2) :: ilocs
1848	INTEGER :: ierror
1849	REAL(wp) :: zmin ! local minimum
1850	REAL(wp), DIMENSION(2,1) :: zain, zaout
1851	!!-----------------------------------------------------------------------
1852	!
1853	zmin = MINVAL( ptab(:,:) , mask= pmask == 1.e0 )
1854	ilocs = MINLOC( ptab(:,:) , mask= pmask == 1.e0 )
1855	!
1856	ki = ilocs(1) + nimpp - 1
1857	kj = ilocs(2) + njmpp - 1
1858	!
1859	zain(1,:)=zmin
1860	zain(2,:)=ki+10000.*kj
1861	!
1862	CALL MPI_ALLREDUCE( zain,zaout, 1, MPI_2DOUBLE_PRECISION,MPI_MINLOC,MPI_COMM_OPA,ierror)
1863	!
1864	pmin = zaout(1,1)
1865	kj = INT(zaout(2,1)/10000.)
1866	ki = INT(zaout(2,1) - 10000.*kj )
1867	!
1868	END SUBROUTINE mpp_minloc2d
1869
1870
1871	SUBROUTINE mpp_minloc3d( ptab, pmask, pmin, ki, kj ,kk)
1872	!!------------------------------------------------------------------------
1873	!! * routine mpp_minloc *
1874	!!
1875	!! ** Purpose : Compute the global minimum of an array ptab
1876	!! and also give its global position
1877	!!
1878	!! ** Method : Use MPI_ALLREDUCE with MPI_MINLOC
1879	!!
1880	!!--------------------------------------------------------------------------
1881	REAL(wp), DIMENSION (jpi,jpj,jpk), INTENT(in ) :: ptab ! Local 2D array
1882	REAL(wp), DIMENSION (jpi,jpj,jpk), INTENT(in ) :: pmask ! Local mask
1883	REAL(wp) , INTENT( out) :: pmin ! Global minimum of ptab
1884	INTEGER , INTENT( out) :: ki, kj, kk ! index of minimum in global frame
1885	!!
1886	INTEGER :: ierror
1887	REAL(wp) :: zmin ! local minimum
1888	INTEGER , DIMENSION(3) :: ilocs
1889	REAL(wp), DIMENSION(2,1) :: zain, zaout
1890	!!-----------------------------------------------------------------------
1891	!
1892	zmin = MINVAL( ptab(:,:,:) , mask= pmask == 1.e0 )
1893	ilocs = MINLOC( ptab(:,:,:) , mask= pmask == 1.e0 )
1894	!
1895	ki = ilocs(1) + nimpp - 1
1896	kj = ilocs(2) + njmpp - 1
1897	kk = ilocs(3)
1898	!
1899	zain(1,:)=zmin
1900	zain(2,:)=ki+10000.kj+100000000.kk
1901	!
1902	CALL MPI_ALLREDUCE( zain,zaout, 1, MPI_2DOUBLE_PRECISION,MPI_MINLOC,MPI_COMM_OPA,ierror)
1903	!
1904	pmin = zaout(1,1)
1905	kk = INT( zaout(2,1) / 100000000. )
1906	kj = INT( zaout(2,1) - kk * 100000000. ) / 10000
1907	ki = INT( zaout(2,1) - kk * 100000000. -kj * 10000. )
1908	!
1909	END SUBROUTINE mpp_minloc3d
1910
1911
1912	SUBROUTINE mpp_maxloc2d( ptab, pmask, pmax, ki, kj )
1913	!!------------------------------------------------------------------------
1914	!! * routine mpp_maxloc *
1915	!!
1916	!! ** Purpose : Compute the global maximum of an array ptab
1917	!! and also give its global position
1918	!!
1919	!! ** Method : Use MPI_ALLREDUCE with MPI_MINLOC
1920	!!
1921	!!--------------------------------------------------------------------------
1922	REAL(wp), DIMENSION (jpi,jpj), INTENT(in ) :: ptab ! Local 2D array
1923	REAL(wp), DIMENSION (jpi,jpj), INTENT(in ) :: pmask ! Local mask
1924	REAL(wp) , INTENT( out) :: pmax ! Global maximum of ptab
1925	INTEGER , INTENT( out) :: ki, kj ! index of maximum in global frame
1926	!!
1927	INTEGER :: ierror
1928	INTEGER, DIMENSION (2) :: ilocs
1929	REAL(wp) :: zmax ! local maximum
1930	REAL(wp), DIMENSION(2,1) :: zain, zaout
1931	!!-----------------------------------------------------------------------
1932	!
1933	zmax = MAXVAL( ptab(:,:) , mask= pmask == 1.e0 )
1934	ilocs = MAXLOC( ptab(:,:) , mask= pmask == 1.e0 )
1935	!
1936	ki = ilocs(1) + nimpp - 1
1937	kj = ilocs(2) + njmpp - 1
1938	!
1939	zain(1,:) = zmax
1940	zain(2,:) = ki + 10000. * kj
1941	!
1942	CALL MPI_ALLREDUCE( zain,zaout, 1, MPI_2DOUBLE_PRECISION,MPI_MAXLOC,MPI_COMM_OPA,ierror)
1943	!
1944	pmax = zaout(1,1)
1945	kj = INT( zaout(2,1) / 10000. )
1946	ki = INT( zaout(2,1) - 10000.* kj )
1947	!
1948	END SUBROUTINE mpp_maxloc2d
1949
1950
1951	SUBROUTINE mpp_maxloc3d( ptab, pmask, pmax, ki, kj, kk )
1952	!!------------------------------------------------------------------------
1953	!! * routine mpp_maxloc *
1954	!!
1955	!! ** Purpose : Compute the global maximum of an array ptab
1956	!! and also give its global position
1957	!!
1958	!! ** Method : Use MPI_ALLREDUCE with MPI_MINLOC
1959	!!
1960	!!--------------------------------------------------------------------------
1961	REAL(wp), DIMENSION (jpi,jpj,jpk), INTENT(in ) :: ptab ! Local 2D array
1962	REAL(wp), DIMENSION (jpi,jpj,jpk), INTENT(in ) :: pmask ! Local mask
1963	REAL(wp) , INTENT( out) :: pmax ! Global maximum of ptab
1964	INTEGER , INTENT( out) :: ki, kj, kk ! index of maximum in global frame
1965	!!
1966	REAL(wp) :: zmax ! local maximum
1967	REAL(wp), DIMENSION(2,1) :: zain, zaout
1968	INTEGER , DIMENSION(3) :: ilocs
1969	INTEGER :: ierror
1970	!!-----------------------------------------------------------------------
1971	!
1972	zmax = MAXVAL( ptab(:,:,:) , mask= pmask == 1.e0 )
1973	ilocs = MAXLOC( ptab(:,:,:) , mask= pmask == 1.e0 )
1974	!
1975	ki = ilocs(1) + nimpp - 1
1976	kj = ilocs(2) + njmpp - 1
1977	kk = ilocs(3)
1978	!
1979	zain(1,:)=zmax
1980	zain(2,:)=ki+10000.kj+100000000.kk
1981	!
1982	CALL MPI_ALLREDUCE( zain,zaout, 1, MPI_2DOUBLE_PRECISION,MPI_MAXLOC,MPI_COMM_OPA,ierror)
1983	!
1984	pmax = zaout(1,1)
1985	kk = INT( zaout(2,1) / 100000000. )
1986	kj = INT( zaout(2,1) - kk * 100000000. ) / 10000
1987	ki = INT( zaout(2,1) - kk * 100000000. -kj * 10000. )
1988	!
1989	END SUBROUTINE mpp_maxloc3d
1990
1991
1992	SUBROUTINE mppsync()
1993	!!----------------------------------------------------------------------
1994	!! * routine mppsync *
1995	!!
1996	!! ** Purpose : Massively parallel processors, synchroneous
1997	!!
1998	!!-----------------------------------------------------------------------
1999	INTEGER :: ierror
2000	!!-----------------------------------------------------------------------
2001	!
2002	CALL mpi_barrier( mpi_comm_opa, ierror )
2003	!
2004	END SUBROUTINE mppsync
2005
2006
2007	SUBROUTINE mppstop
2008
2009	#if defined key_oasis3
2010	USE mod_oasis ! coupling routines
2011	#endif
2012	!!----------------------------------------------------------------------
2013	!! * routine mppstop *
2014	!!
2015	!! ** purpose : Stop massively parallel processors method
2016	!!
2017	!!----------------------------------------------------------------------
2018	INTEGER :: info
2019	!!----------------------------------------------------------------------
2020	!
2021
2022	#if defined key_oasis3
2023	! If we're trying to shut down cleanly then we need to consider the fact
2024	! that this could be part of an MPMD configuration - we don't want to
2025	! leave other components deadlocked.
2026
2027	CALL oasis_abort(nproc,"mppstop","NEMO initiated abort")
2028
2029
2030	#else
2031
2032	CALL mppsync
2033	CALL mpi_finalize( info )
2034	#endif
2035
2036	!
2037	END SUBROUTINE mppstop
2038
2039
2040	SUBROUTINE mpp_comm_free( kcom )
2041	!!----------------------------------------------------------------------
2042	!!----------------------------------------------------------------------
2043	INTEGER, INTENT(in) :: kcom
2044	!!
2045	INTEGER :: ierr
2046	!!----------------------------------------------------------------------
2047	!
2048	CALL MPI_COMM_FREE(kcom, ierr)
2049	!
2050	END SUBROUTINE mpp_comm_free
2051
2052
2053	SUBROUTINE mpp_ini_ice( pindic, kumout )
2054	!!----------------------------------------------------------------------
2055	!! * routine mpp_ini_ice *
2056	!!
2057	!! ** Purpose : Initialize special communicator for ice areas
2058	!! condition together with global variables needed in the ddmpp folding
2059	!!
2060	!! ** Method : - Look for ice processors in ice routines
2061	!! - Put their number in nrank_ice
2062	!! - Create groups for the world processors and the ice processors
2063	!! - Create a communicator for ice processors
2064	!!
2065	!! ** output
2066	!! njmppmax = njmpp for northern procs
2067	!! ndim_rank_ice = number of processors with ice
2068	!! nrank_ice (ndim_rank_ice) = ice processors
2069	!! ngrp_iworld = group ID for the world processors
2070	!! ngrp_ice = group ID for the ice processors
2071	!! ncomm_ice = communicator for the ice procs.
2072	!! n_ice_root = number (in the world) of proc 0 in the ice comm.
2073	!!
2074	!!----------------------------------------------------------------------
2075	INTEGER, INTENT(in) :: pindic
2076	INTEGER, INTENT(in) :: kumout ! ocean.output logical unit
2077	!!
2078	INTEGER :: jjproc
2079	INTEGER :: ii, ierr
2080	INTEGER, ALLOCATABLE, DIMENSION(:) :: kice
2081	INTEGER, ALLOCATABLE, DIMENSION(:) :: zwork
2082	!!----------------------------------------------------------------------
2083	!
2084	! Since this is just an init routine and these arrays are of length jpnij
2085	! then don't use wrk_nemo module - just allocate and deallocate.
2086	ALLOCATE( kice(jpnij), zwork(jpnij), STAT=ierr )
2087	IF( ierr /= 0 ) THEN
2088	WRITE(kumout, cform_err)
2089	WRITE(kumout,*) 'mpp_ini_ice : failed to allocate 2, 1D arrays (jpnij in length)'
2090	CALL mppstop
2091	ENDIF
2092
2093	! Look for how many procs with sea-ice
2094	!
2095	kice = 0
2096	DO jjproc = 1, jpnij
2097	IF( jjproc == narea .AND. pindic .GT. 0 ) kice(jjproc) = 1
2098	END DO
2099	!
2100	zwork = 0
2101	CALL MPI_ALLREDUCE( kice, zwork, jpnij, mpi_integer, mpi_sum, mpi_comm_opa, ierr )
2102	ndim_rank_ice = SUM( zwork )
2103
2104	! Allocate the right size to nrank_north
2105	IF( ALLOCATED ( nrank_ice ) ) DEALLOCATE( nrank_ice )
2106	ALLOCATE( nrank_ice(ndim_rank_ice) )
2107	!
2108	ii = 0
2109	nrank_ice = 0
2110	DO jjproc = 1, jpnij
2111	IF( zwork(jjproc) == 1) THEN
2112	ii = ii + 1
2113	nrank_ice(ii) = jjproc -1
2114	ENDIF
2115	END DO
2116
2117	! Create the world group
2118	CALL MPI_COMM_GROUP( mpi_comm_opa, ngrp_iworld, ierr )
2119
2120	! Create the ice group from the world group
2121	CALL MPI_GROUP_INCL( ngrp_iworld, ndim_rank_ice, nrank_ice, ngrp_ice, ierr )
2122
2123	! Create the ice communicator , ie the pool of procs with sea-ice
2124	CALL MPI_COMM_CREATE( mpi_comm_opa, ngrp_ice, ncomm_ice, ierr )
2125
2126	! Find proc number in the world of proc 0 in the north
2127	! The following line seems to be useless, we just comment & keep it as reminder
2128	! CALL MPI_GROUP_TRANSLATE_RANKS(ngrp_ice,1,0,ngrp_iworld,n_ice_root,ierr)
2129	!
2130	CALL MPI_GROUP_FREE(ngrp_ice, ierr)
2131	CALL MPI_GROUP_FREE(ngrp_iworld, ierr)
2132
2133	DEALLOCATE(kice, zwork)
2134	!
2135	END SUBROUTINE mpp_ini_ice
2136
2137
2138	SUBROUTINE mpp_ini_znl( kumout )
2139	!!----------------------------------------------------------------------
2140	!! * routine mpp_ini_znl *
2141	!!
2142	!! ** Purpose : Initialize special communicator for computing zonal sum
2143	!!
2144	!! ** Method : - Look for processors in the same row
2145	!! - Put their number in nrank_znl
2146	!! - Create group for the znl processors
2147	!! - Create a communicator for znl processors
2148	!! - Determine if processor should write znl files
2149	!!
2150	!! ** output
2151	!! ndim_rank_znl = number of processors on the same row
2152	!! ngrp_znl = group ID for the znl processors
2153	!! ncomm_znl = communicator for the ice procs.
2154	!! n_znl_root = number (in the world) of proc 0 in the ice comm.
2155	!!
2156	!!----------------------------------------------------------------------
2157	INTEGER, INTENT(in) :: kumout ! ocean.output logical units
2158	!
2159	INTEGER :: jproc ! dummy loop integer
2160	INTEGER :: ierr, ii ! local integer
2161	INTEGER, ALLOCATABLE, DIMENSION(:) :: kwork
2162	!!----------------------------------------------------------------------
2163	!-$$ WRITE (numout,*) 'mpp_ini_znl ', nproc, ' - ngrp_world : ', ngrp_world
2164	!-$$ WRITE (numout,*) 'mpp_ini_znl ', nproc, ' - mpi_comm_world : ', mpi_comm_world
2165	!-$$ WRITE (numout,*) 'mpp_ini_znl ', nproc, ' - mpi_comm_opa : ', mpi_comm_opa
2166	!
2167	ALLOCATE( kwork(jpnij), STAT=ierr )
2168	IF( ierr /= 0 ) THEN
2169	WRITE(kumout, cform_err)
2170	WRITE(kumout,*) 'mpp_ini_znl : failed to allocate 1D array of length jpnij'
2171	CALL mppstop
2172	ENDIF
2173
2174	IF( jpnj == 1 ) THEN
2175	ngrp_znl = ngrp_world
2176	ncomm_znl = mpi_comm_opa
2177	ELSE
2178	!
2179	CALL MPI_ALLGATHER ( njmpp, 1, mpi_integer, kwork, 1, mpi_integer, mpi_comm_opa, ierr )
2180	!-$$ WRITE (numout,*) 'mpp_ini_znl ', nproc, ' - kwork pour njmpp : ', kwork
2181	!-$$ CALL flush(numout)
2182	!
2183	! Count number of processors on the same row
2184	ndim_rank_znl = 0
2185	DO jproc=1,jpnij
2186	IF ( kwork(jproc) == njmpp ) THEN
2187	ndim_rank_znl = ndim_rank_znl + 1
2188	ENDIF
2189	END DO
2190	!-$$ WRITE (numout,*) 'mpp_ini_znl ', nproc, ' - ndim_rank_znl : ', ndim_rank_znl
2191	!-$$ CALL flush(numout)
2192	! Allocate the right size to nrank_znl
2193	IF (ALLOCATED (nrank_znl)) DEALLOCATE(nrank_znl)
2194	ALLOCATE(nrank_znl(ndim_rank_znl))
2195	ii = 0
2196	nrank_znl (:) = 0
2197	DO jproc=1,jpnij
2198	IF ( kwork(jproc) == njmpp) THEN
2199	ii = ii + 1
2200	nrank_znl(ii) = jproc -1
2201	ENDIF
2202	END DO
2203	!-$$ WRITE (numout,*) 'mpp_ini_znl ', nproc, ' - nrank_znl : ', nrank_znl
2204	!-$$ CALL flush(numout)
2205
2206	! Create the opa group
2207	CALL MPI_COMM_GROUP(mpi_comm_opa,ngrp_opa,ierr)
2208	!-$$ WRITE (numout,*) 'mpp_ini_znl ', nproc, ' - ngrp_opa : ', ngrp_opa
2209	!-$$ CALL flush(numout)
2210
2211	! Create the znl group from the opa group
2212	CALL MPI_GROUP_INCL ( ngrp_opa, ndim_rank_znl, nrank_znl, ngrp_znl, ierr )
2213	!-$$ WRITE (numout,*) 'mpp_ini_znl ', nproc, ' - ngrp_znl ', ngrp_znl
2214	!-$$ CALL flush(numout)
2215
2216	! Create the znl communicator from the opa communicator, ie the pool of procs in the same row
2217	CALL MPI_COMM_CREATE ( mpi_comm_opa, ngrp_znl, ncomm_znl, ierr )
2218	!-$$ WRITE (numout,*) 'mpp_ini_znl ', nproc, ' - ncomm_znl ', ncomm_znl
2219	!-$$ CALL flush(numout)
2220	!
2221	END IF
2222
2223	! Determines if processor if the first (starting from i=1) on the row
2224	IF ( jpni == 1 ) THEN
2225	l_znl_root = .TRUE.
2226	ELSE
2227	l_znl_root = .FALSE.
2228	kwork (1) = nimpp
2229	CALL mpp_min ( kwork(1), kcom = ncomm_znl)
2230	IF ( nimpp == kwork(1)) l_znl_root = .TRUE.
2231	END IF
2232
2233	DEALLOCATE(kwork)
2234
2235	END SUBROUTINE mpp_ini_znl
2236
2237
2238	SUBROUTINE mpp_ini_north
2239	!!----------------------------------------------------------------------
2240	!! * routine mpp_ini_north *
2241	!!
2242	!! ** Purpose : Initialize special communicator for north folding
2243	!! condition together with global variables needed in the mpp folding
2244	!!
2245	!! ** Method : - Look for northern processors
2246	!! - Put their number in nrank_north
2247	!! - Create groups for the world processors and the north processors
2248	!! - Create a communicator for northern processors
2249	!!
2250	!! ** output
2251	!! njmppmax = njmpp for northern procs
2252	!! ndim_rank_north = number of processors in the northern line
2253	!! nrank_north (ndim_rank_north) = number of the northern procs.
2254	!! ngrp_world = group ID for the world processors
2255	!! ngrp_north = group ID for the northern processors
2256	!! ncomm_north = communicator for the northern procs.
2257	!! north_root = number (in the world) of proc 0 in the northern comm.
2258	!!
2259	!!----------------------------------------------------------------------
2260	INTEGER :: ierr
2261	INTEGER :: jjproc
2262	INTEGER :: ii, ji
2263	!!----------------------------------------------------------------------
2264	!
2265	njmppmax = MAXVAL( njmppt )
2266	!
2267	! Look for how many procs on the northern boundary
2268	ndim_rank_north = 0
2269	DO jjproc = 1, jpnij
2270	IF( njmppt(jjproc) == njmppmax ) ndim_rank_north = ndim_rank_north + 1
2271	END DO
2272	!
2273	! Allocate the right size to nrank_north
2274	IF (ALLOCATED (nrank_north)) DEALLOCATE(nrank_north)
2275	ALLOCATE( nrank_north(ndim_rank_north) )
2276
2277	! Fill the nrank_north array with proc. number of northern procs.
2278	! Note : the rank start at 0 in MPI
2279	ii = 0
2280	DO ji = 1, jpnij
2281	IF ( njmppt(ji) == njmppmax ) THEN
2282	ii=ii+1
2283	nrank_north(ii)=ji-1
2284	END IF
2285	END DO
2286	!
2287	! create the world group
2288	CALL MPI_COMM_GROUP( mpi_comm_opa, ngrp_world, ierr )
2289	!
2290	! Create the North group from the world group
2291	CALL MPI_GROUP_INCL( ngrp_world, ndim_rank_north, nrank_north, ngrp_north, ierr )
2292	!
2293	! Create the North communicator , ie the pool of procs in the north group
2294	CALL MPI_COMM_CREATE( mpi_comm_opa, ngrp_north, ncomm_north, ierr )
2295	!
2296	END SUBROUTINE mpp_ini_north
2297
2298
2299	SUBROUTINE mpp_lbc_north_3d( pt3d, cd_type, psgn )
2300	!!---------------------------------------------------------------------
2301	!! * routine mpp_lbc_north_3d *
2302	!!
2303	!! ** Purpose : Ensure proper north fold horizontal bondary condition
2304	!! in mpp configuration in case of jpn1 > 1
2305	!!
2306	!! ** Method : North fold condition and mpp with more than one proc
2307	!! in i-direction require a specific treatment. We gather
2308	!! the 4 northern lines of the global domain on 1 processor
2309	!! and apply lbc north-fold on this sub array. Then we
2310	!! scatter the north fold array back to the processors.
2311	!!
2312	!!----------------------------------------------------------------------
2313	REAL(wp), DIMENSION(jpi,jpj,jpk), INTENT(inout) :: pt3d ! 3D array on which the b.c. is applied
2314	CHARACTER(len=1) , INTENT(in ) :: cd_type ! nature of pt3d grid-points
2315	! ! = T , U , V , F or W gridpoints
2316	REAL(wp) , INTENT(in ) :: psgn ! = -1. the sign change across the north fold
2317	!! ! = 1. , the sign is kept
2318	INTEGER :: ji, jj, jr, jk
2319	INTEGER :: ierr, itaille, ildi, ilei, iilb
2320	INTEGER :: ijpj, ijpjm1, ij, iproc
2321	INTEGER, DIMENSION (jpmaxngh) :: ml_req_nf !for mpi_isend when avoiding mpi_allgather
2322	INTEGER :: ml_err ! for mpi_isend when avoiding mpi_allgather
2323	INTEGER, DIMENSION(MPI_STATUS_SIZE) :: ml_stat ! for mpi_isend when avoiding mpi_allgather
2324	! ! Workspace for message transfers avoiding mpi_allgather
2325	REAL(wp), DIMENSION(:,:,:) , ALLOCATABLE :: ztab
2326	REAL(wp), DIMENSION(:,:,:) , ALLOCATABLE :: znorthloc, zfoldwk
2327	REAL(wp), DIMENSION(:,:,:,:), ALLOCATABLE :: znorthgloio
2328	REAL(wp), DIMENSION(:,:,:) , ALLOCATABLE :: ztabl, ztabr
2329
2330	INTEGER :: istatus(mpi_status_size)
2331	INTEGER :: iflag
2332	!!----------------------------------------------------------------------
2333	!
2334	ALLOCATE( ztab(jpiglo,4,jpk) , znorthloc(jpi,4,jpk), zfoldwk(jpi,4,jpk), znorthgloio(jpi,4,jpk,jpni) )
2335	ALLOCATE( ztabl(jpi,4,jpk), ztabr(jpi*jpmaxngh, 4, jpk) )
2336
2337	ijpj = 4
2338	ijpjm1 = 3
2339	!
2340	znorthloc(:,:,:) = 0
2341	DO jk = 1, jpk
2342	DO jj = nlcj - ijpj +1, nlcj ! put in xnorthloc the last 4 jlines of pt3d
2343	ij = jj - nlcj + ijpj
2344	znorthloc(:,ij,jk) = pt3d(:,jj,jk)
2345	END DO
2346	END DO
2347	!
2348	! ! Build in procs of ncomm_north the znorthgloio
2349	itaille = jpi * jpk * ijpj
2350
2351	IF ( l_north_nogather ) THEN
2352	!
2353	ztabr(:,:,:) = 0
2354	ztabl(:,:,:) = 0
2355
2356	DO jk = 1, jpk
2357	DO jj = nlcj-ijpj+1, nlcj ! First put local values into the global array
2358	ij = jj - nlcj + ijpj
2359	DO ji = nfsloop, nfeloop
2360	ztabl(ji,ij,jk) = pt3d(ji,jj,jk)
2361	END DO
2362	END DO
2363	END DO
2364
2365	DO jr = 1,nsndto
2366	IF ((nfipproc(isendto(jr),jpnj) .ne. (narea-1)) .and. (nfipproc(isendto(jr),jpnj) .ne. -1)) THEN
2367	CALL mppsend( 5, znorthloc, itaille, nfipproc(isendto(jr),jpnj), ml_req_nf(jr) )
2368	ENDIF
2369	END DO
2370	DO jr = 1,nsndto
2371	iproc = nfipproc(isendto(jr),jpnj)
2372	IF(iproc .ne. -1) THEN
2373	ilei = nleit (iproc+1)
2374	ildi = nldit (iproc+1)
2375	iilb = nfiimpp(isendto(jr),jpnj) - nfiimpp(isendto(1),jpnj)
2376	ENDIF
2377	IF((iproc .ne. (narea-1)) .and. (iproc .ne. -1)) THEN
2378	CALL mpprecv(5, zfoldwk, itaille, iproc)
2379	DO jk = 1, jpk
2380	DO jj = 1, ijpj
2381	DO ji = ildi, ilei
2382	ztabr(iilb+ji,jj,jk) = zfoldwk(ji,jj,jk)
2383	END DO
2384	END DO
2385	END DO
2386	ELSE IF (iproc .eq. (narea-1)) THEN
2387	DO jk = 1, jpk
2388	DO jj = 1, ijpj
2389	DO ji = ildi, ilei
2390	ztabr(iilb+ji,jj,jk) = pt3d(ji,nlcj-ijpj+jj,jk)
2391	END DO
2392	END DO
2393	END DO
2394	ENDIF
2395	END DO
2396	IF (l_isend) THEN
2397	DO jr = 1,nsndto
2398	IF ((nfipproc(isendto(jr),jpnj) .ne. (narea-1)) .and. (nfipproc(isendto(jr),jpnj) .ne. -1)) THEN
2399	CALL mpi_wait(ml_req_nf(jr), ml_stat, ml_err)
2400	ENDIF
2401	END DO
2402	ENDIF
2403	CALL mpp_lbc_nfd( ztabl, ztabr, cd_type, psgn ) ! North fold boundary condition
2404	DO jk = 1, jpk
2405	DO jj = nlcj-ijpj+1, nlcj ! Scatter back to pt3d
2406	ij = jj - nlcj + ijpj
2407	DO ji= 1, nlci
2408	pt3d(ji,jj,jk) = ztabl(ji,ij,jk)
2409	END DO
2410	END DO
2411	END DO
2412	!
2413
2414	ELSE
2415	CALL MPI_ALLGATHER( znorthloc , itaille, MPI_DOUBLE_PRECISION, &
2416	& znorthgloio, itaille, MPI_DOUBLE_PRECISION, ncomm_north, ierr )
2417	!
2418	ztab(:,:,:) = 0.e0
2419	DO jr = 1, ndim_rank_north ! recover the global north array
2420	iproc = nrank_north(jr) + 1
2421	ildi = nldit (iproc)
2422	ilei = nleit (iproc)
2423	iilb = nimppt(iproc)
2424	DO jk = 1, jpk
2425	DO jj = 1, ijpj
2426	DO ji = ildi, ilei
2427	ztab(ji+iilb-1,jj,jk) = znorthgloio(ji,jj,jk,jr)
2428	END DO
2429	END DO
2430	END DO
2431	END DO
2432	CALL lbc_nfd( ztab, cd_type, psgn ) ! North fold boundary condition
2433	!
2434	DO jk = 1, jpk
2435	DO jj = nlcj-ijpj+1, nlcj ! Scatter back to pt3d
2436	ij = jj - nlcj + ijpj
2437	DO ji= 1, nlci
2438	pt3d(ji,jj,jk) = ztab(ji+nimpp-1,ij,jk)
2439	END DO
2440	END DO
2441	END DO
2442	!
2443	ENDIF
2444	!
2445	! The ztab array has been either:
2446	! a. Fully populated by the mpi_allgather operation or
2447	! b. Had the active points for this domain and northern neighbours populated
2448	! by peer to peer exchanges
2449	! Either way the array may be folded by lbc_nfd and the result for the span of
2450	! this domain will be identical.
2451	!
2452	DEALLOCATE( ztab, znorthloc, zfoldwk, znorthgloio )
2453	DEALLOCATE( ztabl, ztabr )
2454	!
2455	END SUBROUTINE mpp_lbc_north_3d
2456
2457
2458	SUBROUTINE mpp_lbc_north_2d( pt2d, cd_type, psgn)
2459	!!---------------------------------------------------------------------
2460	!! * routine mpp_lbc_north_2d *
2461	!!
2462	!! ** Purpose : Ensure proper north fold horizontal bondary condition
2463	!! in mpp configuration in case of jpn1 > 1 (for 2d array )
2464	!!
2465	!! ** Method : North fold condition and mpp with more than one proc
2466	!! in i-direction require a specific treatment. We gather
2467	!! the 4 northern lines of the global domain on 1 processor
2468	!! and apply lbc north-fold on this sub array. Then we
2469	!! scatter the north fold array back to the processors.
2470	!!
2471	!!----------------------------------------------------------------------
2472	REAL(wp), DIMENSION(jpi,jpj), INTENT(inout) :: pt2d ! 2D array on which the b.c. is applied
2473	CHARACTER(len=1) , INTENT(in ) :: cd_type ! nature of pt2d grid-points
2474	! ! = T , U , V , F or W gridpoints
2475	REAL(wp) , INTENT(in ) :: psgn ! = -1. the sign change across the north fold
2476	!! ! = 1. , the sign is kept
2477	INTEGER :: ji, jj, jr
2478	INTEGER :: ierr, itaille, ildi, ilei, iilb
2479	INTEGER :: ijpj, ijpjm1, ij, iproc
2480	INTEGER, DIMENSION (jpmaxngh) :: ml_req_nf !for mpi_isend when avoiding mpi_allgather
2481	INTEGER :: ml_err ! for mpi_isend when avoiding mpi_allgather
2482	INTEGER, DIMENSION(MPI_STATUS_SIZE):: ml_stat ! for mpi_isend when avoiding mpi_allgather
2483	! ! Workspace for message transfers avoiding mpi_allgather
2484	REAL(wp), DIMENSION(:,:) , ALLOCATABLE :: ztab
2485	REAL(wp), DIMENSION(:,:) , ALLOCATABLE :: znorthloc, zfoldwk
2486	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: znorthgloio
2487	REAL(wp), DIMENSION(:,:) , ALLOCATABLE :: ztabl, ztabr
2488	INTEGER :: istatus(mpi_status_size)
2489	INTEGER :: iflag
2490	!!----------------------------------------------------------------------
2491	!
2492	ALLOCATE( ztab(jpiglo,4), znorthloc(jpi,4), zfoldwk(jpi,4), znorthgloio(jpi,4,jpni) )
2493	ALLOCATE( ztabl(jpi,4), ztabr(jpi*jpmaxngh, 4) )
2494	!
2495	ijpj = 4
2496	ijpjm1 = 3
2497	!
2498	DO jj = nlcj-ijpj+1, nlcj ! put in znorthloc the last 4 jlines of pt2d
2499	ij = jj - nlcj + ijpj
2500	znorthloc(:,ij) = pt2d(:,jj)
2501	END DO
2502
2503	! ! Build in procs of ncomm_north the znorthgloio
2504	itaille = jpi * ijpj
2505	IF ( l_north_nogather ) THEN
2506	!
2507	! Avoid the use of mpi_allgather by exchanging only with the processes already identified
2508	! (in nemo_northcomms) as being involved in this process' northern boundary exchange
2509	!
2510	ztabr(:,:) = 0
2511	ztabl(:,:) = 0
2512
2513	DO jj = nlcj-ijpj+1, nlcj ! First put local values into the global array
2514	ij = jj - nlcj + ijpj
2515	DO ji = nfsloop, nfeloop
2516	ztabl(ji,ij) = pt2d(ji,jj)
2517	END DO
2518	END DO
2519
2520	DO jr = 1,nsndto
2521	IF ((nfipproc(isendto(jr),jpnj) .ne. (narea-1)) .and. (nfipproc(isendto(jr),jpnj) .ne. -1)) THEN
2522	CALL mppsend(5, znorthloc, itaille, nfipproc(isendto(jr),jpnj), ml_req_nf(jr))
2523	ENDIF
2524	END DO
2525	DO jr = 1,nsndto
2526	iproc = nfipproc(isendto(jr),jpnj)
2527	IF(iproc .ne. -1) THEN
2528	ilei = nleit (iproc+1)
2529	ildi = nldit (iproc+1)
2530	iilb = nfiimpp(isendto(jr),jpnj) - nfiimpp(isendto(1),jpnj)
2531	ENDIF
2532	IF((iproc .ne. (narea-1)) .and. (iproc .ne. -1)) THEN
2533	CALL mpprecv(5, zfoldwk, itaille, iproc)
2534	DO jj = 1, ijpj
2535	DO ji = ildi, ilei
2536	ztabr(iilb+ji,jj) = zfoldwk(ji,jj)
2537	END DO
2538	END DO
2539	ELSE IF (iproc .eq. (narea-1)) THEN
2540	DO jj = 1, ijpj
2541	DO ji = ildi, ilei
2542	ztabr(iilb+ji,jj) = pt2d(ji,nlcj-ijpj+jj)
2543	END DO
2544	END DO
2545	ENDIF
2546	END DO
2547	IF (l_isend) THEN
2548	DO jr = 1,nsndto
2549	IF ((nfipproc(isendto(jr),jpnj) .ne. (narea-1)) .and. (nfipproc(isendto(jr),jpnj) .ne. -1)) THEN
2550	CALL mpi_wait(ml_req_nf(jr), ml_stat, ml_err)
2551	ENDIF
2552	END DO
2553	ENDIF
2554	CALL mpp_lbc_nfd( ztabl, ztabr, cd_type, psgn ) ! North fold boundary condition
2555	!
2556	DO jj = nlcj-ijpj+1, nlcj ! Scatter back to pt2d
2557	ij = jj - nlcj + ijpj
2558	DO ji = 1, nlci
2559	pt2d(ji,jj) = ztabl(ji,ij)
2560	END DO
2561	END DO
2562	!
2563	ELSE
2564	CALL MPI_ALLGATHER( znorthloc , itaille, MPI_DOUBLE_PRECISION, &
2565	& znorthgloio, itaille, MPI_DOUBLE_PRECISION, ncomm_north, ierr )
2566	!
2567	ztab(:,:) = 0.e0
2568	DO jr = 1, ndim_rank_north ! recover the global north array
2569	iproc = nrank_north(jr) + 1
2570	ildi = nldit (iproc)
2571	ilei = nleit (iproc)
2572	iilb = nimppt(iproc)
2573	DO jj = 1, ijpj
2574	DO ji = ildi, ilei
2575	ztab(ji+iilb-1,jj) = znorthgloio(ji,jj,jr)
2576	END DO
2577	END DO
2578	END DO
2579	CALL lbc_nfd( ztab, cd_type, psgn ) ! North fold boundary condition
2580	!
2581	DO jj = nlcj-ijpj+1, nlcj ! Scatter back to pt2d
2582	ij = jj - nlcj + ijpj
2583	DO ji = 1, nlci
2584	pt2d(ji,jj) = ztab(ji+nimpp-1,ij)
2585	END DO
2586	END DO
2587	!
2588	ENDIF
2589	DEALLOCATE( ztab, znorthloc, zfoldwk, znorthgloio )
2590	DEALLOCATE( ztabl, ztabr )
2591	!
2592	END SUBROUTINE mpp_lbc_north_2d
2593
2594
2595	SUBROUTINE mpp_lbc_north_e( pt2d, cd_type, psgn)
2596	!!---------------------------------------------------------------------
2597	!! * routine mpp_lbc_north_2d *
2598	!!
2599	!! ** Purpose : Ensure proper north fold horizontal bondary condition
2600	!! in mpp configuration in case of jpn1 > 1 and for 2d
2601	!! array with outer extra halo
2602	!!
2603	!! ** Method : North fold condition and mpp with more than one proc
2604	!! in i-direction require a specific treatment. We gather
2605	!! the 4+2*jpr2dj northern lines of the global domain on 1
2606	!! processor and apply lbc north-fold on this sub array.
2607	!! Then we scatter the north fold array back to the processors.
2608	!!
2609	!!----------------------------------------------------------------------
2610	REAL(wp), DIMENSION(1-jpr2di:jpi+jpr2di,1-jpr2dj:jpj+jpr2dj), INTENT(inout) :: pt2d ! 2D array with extra halo
2611	CHARACTER(len=1) , INTENT(in ) :: cd_type ! nature of pt3d grid-points
2612	! ! = T , U , V , F or W -points
2613	REAL(wp) , INTENT(in ) :: psgn ! = -1. the sign change across the
2614	!! ! north fold, = 1. otherwise
2615	INTEGER :: ji, jj, jr
2616	INTEGER :: ierr, itaille, ildi, ilei, iilb
2617	INTEGER :: ijpj, ij, iproc
2618	!
2619	REAL(wp), DIMENSION(:,:) , ALLOCATABLE :: ztab_e, znorthloc_e
2620	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: znorthgloio_e
2621
2622	!!----------------------------------------------------------------------
2623	!
2624	ALLOCATE( ztab_e(jpiglo,4+2jpr2dj), znorthloc_e(jpi,4+2jpr2dj), znorthgloio_e(jpi,4+2*jpr2dj,jpni) )
2625
2626	!
2627	ijpj=4
2628	ztab_e(:,:) = 0.e0
2629
2630	ij=0
2631	! put in znorthloc_e the last 4 jlines of pt2d
2632	DO jj = nlcj - ijpj + 1 - jpr2dj, nlcj +jpr2dj
2633	ij = ij + 1
2634	DO ji = 1, jpi
2635	znorthloc_e(ji,ij)=pt2d(ji,jj)
2636	END DO
2637	END DO
2638	!
2639	itaille = jpi * ( ijpj + 2 * jpr2dj )
2640	CALL MPI_ALLGATHER( znorthloc_e(1,1) , itaille, MPI_DOUBLE_PRECISION, &
2641	& znorthgloio_e(1,1,1), itaille, MPI_DOUBLE_PRECISION, ncomm_north, ierr )
2642	!
2643	DO jr = 1, ndim_rank_north ! recover the global north array
2644	iproc = nrank_north(jr) + 1
2645	ildi = nldit (iproc)
2646	ilei = nleit (iproc)
2647	iilb = nimppt(iproc)
2648	DO jj = 1, ijpj+2*jpr2dj
2649	DO ji = ildi, ilei
2650	ztab_e(ji+iilb-1,jj) = znorthgloio_e(ji,jj,jr)
2651	END DO
2652	END DO
2653	END DO
2654
2655
2656	! 2. North-Fold boundary conditions
2657	! ----------------------------------
2658	CALL lbc_nfd( ztab_e(:,:), cd_type, psgn, pr2dj = jpr2dj )
2659
2660	ij = jpr2dj
2661	!! Scatter back to pt2d
2662	DO jj = nlcj - ijpj + 1 , nlcj +jpr2dj
2663	ij = ij +1
2664	DO ji= 1, nlci
2665	pt2d(ji,jj) = ztab_e(ji+nimpp-1,ij)
2666	END DO
2667	END DO
2668	!
2669	DEALLOCATE( ztab_e, znorthloc_e, znorthgloio_e )
2670	!
2671	END SUBROUTINE mpp_lbc_north_e
2672
2673	SUBROUTINE mpp_lnk_bdy_3d( ptab, cd_type, psgn, ib_bdy )
2674	!!----------------------------------------------------------------------
2675	!! * routine mpp_lnk_bdy_3d *
2676	!!
2677	!! ** Purpose : Message passing management
2678	!!
2679	!! ** Method : Use mppsend and mpprecv function for passing BDY boundaries
2680	!! between processors following neighboring subdomains.
2681	!! domain parameters
2682	!! nlci : first dimension of the local subdomain
2683	!! nlcj : second dimension of the local subdomain
2684	!! nbondi_bdy : mark for "east-west local boundary"
2685	!! nbondj_bdy : mark for "north-south local boundary"
2686	!! noea : number for local neighboring processors
2687	!! nowe : number for local neighboring processors
2688	!! noso : number for local neighboring processors
2689	!! nono : number for local neighboring processors
2690	!!
2691	!! ** Action : ptab with update value at its periphery
2692	!!
2693	!!----------------------------------------------------------------------
2694
2695	USE lbcnfd ! north fold
2696
2697	INCLUDE 'mpif.h'
2698
2699	REAL(wp), DIMENSION(jpi,jpj,jpk), INTENT(inout) :: ptab ! 3D array on which the boundary condition is applied
2700	CHARACTER(len=1) , INTENT(in ) :: cd_type ! define the nature of ptab array grid-points
2701	! ! = T , U , V , F , W points
2702	REAL(wp) , INTENT(in ) :: psgn ! =-1 the sign change across the north fold boundary
2703	! ! = 1. , the sign is kept
2704	INTEGER , INTENT(in ) :: ib_bdy ! BDY boundary set
2705	INTEGER :: ji, jj, jk, jl ! dummy loop indices
2706	INTEGER :: imigr, iihom, ijhom ! temporary integers
2707	INTEGER :: ml_req1, ml_req2, ml_err ! for key_mpi_isend
2708	REAL(wp) :: zland
2709	INTEGER, DIMENSION(MPI_STATUS_SIZE) :: ml_stat ! for key_mpi_isend
2710	!
2711	REAL(wp), DIMENSION(:,:,:,:), ALLOCATABLE :: zt3ns, zt3sn ! 3d for north-south & south-north
2712	REAL(wp), DIMENSION(:,:,:,:), ALLOCATABLE :: zt3ew, zt3we ! 3d for east-west & west-east
2713
2714	!!----------------------------------------------------------------------
2715
2716	ALLOCATE( zt3ns(jpi,jprecj,jpk,2), zt3sn(jpi,jprecj,jpk,2), &
2717	& zt3ew(jpj,jpreci,jpk,2), zt3we(jpj,jpreci,jpk,2) )
2718
2719	zland = 0.e0
2720
2721	! 1. standard boundary treatment
2722	! ------------------------------
2723
2724	! ! East-West boundaries
2725	! !* Cyclic east-west
2726
2727	IF( nbondi == 2) THEN
2728	IF (nperio == 1 .OR. nperio == 4 .OR. nperio == 6) THEN
2729	ptab( 1 ,:,:) = ptab(jpim1,:,:)
2730	ptab(jpi,:,:) = ptab( 2 ,:,:)
2731	ELSE
2732	IF( .NOT. cd_type == 'F' ) ptab( 1 :jpreci,:,:) = zland ! south except F-point
2733	ptab(nlci-jpreci+1:jpi ,:,:) = zland ! north
2734	ENDIF
2735	ELSEIF(nbondi == -1) THEN
2736	IF( .NOT. cd_type == 'F' ) ptab( 1 :jpreci,:,:) = zland ! south except F-point
2737	ELSEIF(nbondi == 1) THEN
2738	ptab(nlci-jpreci+1:jpi ,:,:) = zland ! north
2739	ENDIF !* closed
2740
2741	IF (nbondj == 2 .OR. nbondj == -1) THEN
2742	IF( .NOT. cd_type == 'F' ) ptab(:, 1 :jprecj,:) = zland ! south except F-point
2743	ELSEIF (nbondj == 2 .OR. nbondj == 1) THEN
2744	ptab(:,nlcj-jprecj+1:jpj ,:) = zland ! north
2745	ENDIF
2746
2747	!
2748
2749	! 2. East and west directions exchange
2750	! ------------------------------------
2751	! we play with the neigbours AND the row number because of the periodicity
2752	!
2753	SELECT CASE ( nbondi_bdy(ib_bdy) ) ! Read Dirichlet lateral conditions
2754	CASE ( -1, 0, 1 ) ! all exept 2 (i.e. close case)
2755	iihom = nlci-nreci
2756	DO jl = 1, jpreci
2757	zt3ew(:,jl,:,1) = ptab(jpreci+jl,:,:)
2758	zt3we(:,jl,:,1) = ptab(iihom +jl,:,:)
2759	END DO
2760	END SELECT
2761	!
2762	! ! Migrations
2763	imigr = jpreci * jpj * jpk
2764	!
2765	SELECT CASE ( nbondi_bdy(ib_bdy) )
2766	CASE ( -1 )
2767	CALL mppsend( 2, zt3we(1,1,1,1), imigr, noea, ml_req1 )
2768	CASE ( 0 )
2769	CALL mppsend( 1, zt3ew(1,1,1,1), imigr, nowe, ml_req1 )
2770	CALL mppsend( 2, zt3we(1,1,1,1), imigr, noea, ml_req2 )
2771	CASE ( 1 )
2772	CALL mppsend( 1, zt3ew(1,1,1,1), imigr, nowe, ml_req1 )
2773	END SELECT
2774	!
2775	SELECT CASE ( nbondi_bdy_b(ib_bdy) )
2776	CASE ( -1 )
2777	CALL mpprecv( 1, zt3ew(1,1,1,2), imigr, noea )
2778	CASE ( 0 )
2779	CALL mpprecv( 1, zt3ew(1,1,1,2), imigr, noea )
2780	CALL mpprecv( 2, zt3we(1,1,1,2), imigr, nowe )
2781	CASE ( 1 )
2782	CALL mpprecv( 2, zt3we(1,1,1,2), imigr, nowe )
2783	END SELECT
2784	!
2785	SELECT CASE ( nbondi_bdy(ib_bdy) )
2786	CASE ( -1 )
2787	IF(l_isend) CALL mpi_wait(ml_req1, ml_stat, ml_err)
2788	CASE ( 0 )
2789	IF(l_isend) CALL mpi_wait(ml_req1, ml_stat, ml_err)
2790	IF(l_isend) CALL mpi_wait(ml_req2, ml_stat, ml_err)
2791	CASE ( 1 )
2792	IF(l_isend) CALL mpi_wait(ml_req1, ml_stat, ml_err)
2793	END SELECT
2794	!
2795	! ! Write Dirichlet lateral conditions
2796	iihom = nlci-jpreci
2797	!
2798	SELECT CASE ( nbondi_bdy_b(ib_bdy) )
2799	CASE ( -1 )
2800	DO jl = 1, jpreci
2801	ptab(iihom+jl,:,:) = zt3ew(:,jl,:,2)
2802	END DO
2803	CASE ( 0 )
2804	DO jl = 1, jpreci
2805	ptab(jl ,:,:) = zt3we(:,jl,:,2)
2806	ptab(iihom+jl,:,:) = zt3ew(:,jl,:,2)
2807	END DO
2808	CASE ( 1 )
2809	DO jl = 1, jpreci
2810	ptab(jl ,:,:) = zt3we(:,jl,:,2)
2811	END DO
2812	END SELECT
2813
2814
2815	! 3. North and south directions
2816	! -----------------------------
2817	! always closed : we play only with the neigbours
2818	!
2819	IF( nbondj_bdy(ib_bdy) /= 2 ) THEN ! Read Dirichlet lateral conditions
2820	ijhom = nlcj-nrecj
2821	DO jl = 1, jprecj
2822	zt3sn(:,jl,:,1) = ptab(:,ijhom +jl,:)
2823	zt3ns(:,jl,:,1) = ptab(:,jprecj+jl,:)
2824	END DO
2825	ENDIF
2826	!
2827	! ! Migrations
2828	imigr = jprecj * jpi * jpk
2829	!
2830	SELECT CASE ( nbondj_bdy(ib_bdy) )
2831	CASE ( -1 )
2832	CALL mppsend( 4, zt3sn(1,1,1,1), imigr, nono, ml_req1 )
2833	CASE ( 0 )
2834	CALL mppsend( 3, zt3ns(1,1,1,1), imigr, noso, ml_req1 )
2835	CALL mppsend( 4, zt3sn(1,1,1,1), imigr, nono, ml_req2 )
2836	CASE ( 1 )
2837	CALL mppsend( 3, zt3ns(1,1,1,1), imigr, noso, ml_req1 )
2838	END SELECT
2839	!
2840	SELECT CASE ( nbondj_bdy_b(ib_bdy) )
2841	CASE ( -1 )
2842	CALL mpprecv( 3, zt3ns(1,1,1,2), imigr, nono )
2843	CASE ( 0 )
2844	CALL mpprecv( 3, zt3ns(1,1,1,2), imigr, nono )
2845	CALL mpprecv( 4, zt3sn(1,1,1,2), imigr, noso )
2846	CASE ( 1 )
2847	CALL mpprecv( 4, zt3sn(1,1,1,2), imigr, noso )
2848	END SELECT
2849	!
2850	SELECT CASE ( nbondj_bdy(ib_bdy) )
2851	CASE ( -1 )
2852	IF(l_isend) CALL mpi_wait(ml_req1, ml_stat, ml_err)
2853	CASE ( 0 )
2854	IF(l_isend) CALL mpi_wait(ml_req1, ml_stat, ml_err)
2855	IF(l_isend) CALL mpi_wait(ml_req2, ml_stat, ml_err)
2856	CASE ( 1 )
2857	IF(l_isend) CALL mpi_wait(ml_req1, ml_stat, ml_err)
2858	END SELECT
2859	!
2860	! ! Write Dirichlet lateral conditions
2861	ijhom = nlcj-jprecj
2862	!
2863	SELECT CASE ( nbondj_bdy_b(ib_bdy) )
2864	CASE ( -1 )
2865	DO jl = 1, jprecj
2866	ptab(:,ijhom+jl,:) = zt3ns(:,jl,:,2)
2867	END DO
2868	CASE ( 0 )
2869	DO jl = 1, jprecj
2870	ptab(:,jl ,:) = zt3sn(:,jl,:,2)
2871	ptab(:,ijhom+jl,:) = zt3ns(:,jl,:,2)
2872	END DO
2873	CASE ( 1 )
2874	DO jl = 1, jprecj
2875	ptab(:,jl,:) = zt3sn(:,jl,:,2)
2876	END DO
2877	END SELECT
2878
2879
2880	! 4. north fold treatment
2881	! -----------------------
2882	!
2883	IF( npolj /= 0) THEN
2884	!
2885	SELECT CASE ( jpni )
2886	CASE ( 1 ) ; CALL lbc_nfd ( ptab, cd_type, psgn ) ! only 1 northern proc, no mpp
2887	CASE DEFAULT ; CALL mpp_lbc_north( ptab, cd_type, psgn ) ! for all northern procs.
2888	END SELECT
2889	!
2890	ENDIF
2891	!
2892	DEALLOCATE( zt3ns, zt3sn, zt3ew, zt3we )
2893	!
2894	END SUBROUTINE mpp_lnk_bdy_3d
2895
2896	SUBROUTINE mpp_lnk_bdy_2d( ptab, cd_type, psgn, ib_bdy )
2897	!!----------------------------------------------------------------------
2898	!! * routine mpp_lnk_bdy_2d *
2899	!!
2900	!! ** Purpose : Message passing management
2901	!!
2902	!! ** Method : Use mppsend and mpprecv function for passing BDY boundaries
2903	!! between processors following neighboring subdomains.
2904	!! domain parameters
2905	!! nlci : first dimension of the local subdomain
2906	!! nlcj : second dimension of the local subdomain
2907	!! nbondi_bdy : mark for "east-west local boundary"
2908	!! nbondj_bdy : mark for "north-south local boundary"
2909	!! noea : number for local neighboring processors
2910	!! nowe : number for local neighboring processors
2911	!! noso : number for local neighboring processors
2912	!! nono : number for local neighboring processors
2913	!!
2914	!! ** Action : ptab with update value at its periphery
2915	!!
2916	!!----------------------------------------------------------------------
2917
2918	USE lbcnfd ! north fold
2919
2920	INCLUDE 'mpif.h'
2921
2922	REAL(wp), DIMENSION(jpi,jpj) , INTENT(inout) :: ptab ! 3D array on which the boundary condition is applied
2923	CHARACTER(len=1) , INTENT(in ) :: cd_type ! define the nature of ptab array grid-points
2924	! ! = T , U , V , F , W points
2925	REAL(wp) , INTENT(in ) :: psgn ! =-1 the sign change across the north fold boundary
2926	! ! = 1. , the sign is kept
2927	INTEGER , INTENT(in ) :: ib_bdy ! BDY boundary set
2928	INTEGER :: ji, jj, jl ! dummy loop indices
2929	INTEGER :: imigr, iihom, ijhom ! temporary integers
2930	INTEGER :: ml_req1, ml_req2, ml_err ! for key_mpi_isend
2931	REAL(wp) :: zland
2932	INTEGER, DIMENSION(MPI_STATUS_SIZE) :: ml_stat ! for key_mpi_isend
2933	!
2934	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: zt2ns, zt2sn ! 2d for north-south & south-north
2935	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: zt2ew, zt2we ! 2d for east-west & west-east
2936
2937	!!----------------------------------------------------------------------
2938
2939	ALLOCATE( zt2ns(jpi,jprecj,2), zt2sn(jpi,jprecj,2), &
2940	& zt2ew(jpj,jpreci,2), zt2we(jpj,jpreci,2) )
2941
2942	zland = 0.e0
2943
2944	! 1. standard boundary treatment
2945	! ------------------------------
2946
2947	! ! East-West boundaries
2948	! !* Cyclic east-west
2949
2950	IF( nbondi == 2) THEN
2951	IF (nperio == 1 .OR. nperio == 4 .OR. nperio == 6) THEN
2952	ptab( 1 ,:) = ptab(jpim1,:)
2953	ptab(jpi,:) = ptab( 2 ,:)
2954	ELSE
2955	IF( .NOT. cd_type == 'F' ) ptab( 1 :jpreci,:) = zland ! south except F-point
2956	ptab(nlci-jpreci+1:jpi ,:) = zland ! north
2957	ENDIF
2958	ELSEIF(nbondi == -1) THEN
2959	IF( .NOT. cd_type == 'F' ) ptab( 1 :jpreci,:) = zland ! south except F-point
2960	ELSEIF(nbondi == 1) THEN
2961	ptab(nlci-jpreci+1:jpi ,:) = zland ! north
2962	ENDIF !* closed
2963
2964	IF (nbondj == 2 .OR. nbondj == -1) THEN
2965	IF( .NOT. cd_type == 'F' ) ptab(:, 1 :jprecj) = zland ! south except F-point
2966	ELSEIF (nbondj == 2 .OR. nbondj == 1) THEN
2967	ptab(:,nlcj-jprecj+1:jpj) = zland ! north
2968	ENDIF
2969
2970	!
2971
2972	! 2. East and west directions exchange
2973	! ------------------------------------
2974	! we play with the neigbours AND the row number because of the periodicity
2975	!
2976	SELECT CASE ( nbondi_bdy(ib_bdy) ) ! Read Dirichlet lateral conditions
2977	CASE ( -1, 0, 1 ) ! all exept 2 (i.e. close case)
2978	iihom = nlci-nreci
2979	DO jl = 1, jpreci
2980	zt2ew(:,jl,1) = ptab(jpreci+jl,:)
2981	zt2we(:,jl,1) = ptab(iihom +jl,:)
2982	END DO
2983	END SELECT
2984	!
2985	! ! Migrations
2986	imigr = jpreci * jpj
2987	!
2988	SELECT CASE ( nbondi_bdy(ib_bdy) )
2989	CASE ( -1 )
2990	CALL mppsend( 2, zt2we(1,1,1), imigr, noea, ml_req1 )
2991	CASE ( 0 )
2992	CALL mppsend( 1, zt2ew(1,1,1), imigr, nowe, ml_req1 )
2993	CALL mppsend( 2, zt2we(1,1,1), imigr, noea, ml_req2 )
2994	CASE ( 1 )
2995	CALL mppsend( 1, zt2ew(1,1,1), imigr, nowe, ml_req1 )
2996	END SELECT
2997	!
2998	SELECT CASE ( nbondi_bdy_b(ib_bdy) )
2999	CASE ( -1 )
3000	CALL mpprecv( 1, zt2ew(1,1,2), imigr, noea )
3001	CASE ( 0 )
3002	CALL mpprecv( 1, zt2ew(1,1,2), imigr, noea )
3003	CALL mpprecv( 2, zt2we(1,1,2), imigr, nowe )
3004	CASE ( 1 )
3005	CALL mpprecv( 2, zt2we(1,1,2), imigr, nowe )
3006	END SELECT
3007	!
3008	SELECT CASE ( nbondi_bdy(ib_bdy) )
3009	CASE ( -1 )
3010	IF(l_isend) CALL mpi_wait(ml_req1, ml_stat, ml_err)
3011	CASE ( 0 )
3012	IF(l_isend) CALL mpi_wait(ml_req1, ml_stat, ml_err)
3013	IF(l_isend) CALL mpi_wait(ml_req2, ml_stat, ml_err)
3014	CASE ( 1 )
3015	IF(l_isend) CALL mpi_wait(ml_req1, ml_stat, ml_err)
3016	END SELECT
3017	!
3018	! ! Write Dirichlet lateral conditions
3019	iihom = nlci-jpreci
3020	!
3021	SELECT CASE ( nbondi_bdy_b(ib_bdy) )
3022	CASE ( -1 )
3023	DO jl = 1, jpreci
3024	ptab(iihom+jl,:) = zt2ew(:,jl,2)
3025	END DO
3026	CASE ( 0 )
3027	DO jl = 1, jpreci
3028	ptab(jl ,:) = zt2we(:,jl,2)
3029	ptab(iihom+jl,:) = zt2ew(:,jl,2)
3030	END DO
3031	CASE ( 1 )
3032	DO jl = 1, jpreci
3033	ptab(jl ,:) = zt2we(:,jl,2)
3034	END DO
3035	END SELECT
3036
3037
3038	! 3. North and south directions
3039	! -----------------------------
3040	! always closed : we play only with the neigbours
3041	!
3042	IF( nbondj_bdy(ib_bdy) /= 2 ) THEN ! Read Dirichlet lateral conditions
3043	ijhom = nlcj-nrecj
3044	DO jl = 1, jprecj
3045	zt2sn(:,jl,1) = ptab(:,ijhom +jl)
3046	zt2ns(:,jl,1) = ptab(:,jprecj+jl)
3047	END DO
3048	ENDIF
3049	!
3050	! ! Migrations
3051	imigr = jprecj * jpi
3052	!
3053	SELECT CASE ( nbondj_bdy(ib_bdy) )
3054	CASE ( -1 )
3055	CALL mppsend( 4, zt2sn(1,1,1), imigr, nono, ml_req1 )
3056	CASE ( 0 )
3057	CALL mppsend( 3, zt2ns(1,1,1), imigr, noso, ml_req1 )
3058	CALL mppsend( 4, zt2sn(1,1,1), imigr, nono, ml_req2 )
3059	CASE ( 1 )
3060	CALL mppsend( 3, zt2ns(1,1,1), imigr, noso, ml_req1 )
3061	END SELECT
3062	!
3063	SELECT CASE ( nbondj_bdy_b(ib_bdy) )
3064	CASE ( -1 )
3065	CALL mpprecv( 3, zt2ns(1,1,2), imigr, nono )
3066	CASE ( 0 )
3067	CALL mpprecv( 3, zt2ns(1,1,2), imigr, nono )
3068	CALL mpprecv( 4, zt2sn(1,1,2), imigr, noso )
3069	CASE ( 1 )
3070	CALL mpprecv( 4, zt2sn(1,1,2), imigr, noso )
3071	END SELECT
3072	!
3073	SELECT CASE ( nbondj_bdy(ib_bdy) )
3074	CASE ( -1 )
3075	IF(l_isend) CALL mpi_wait(ml_req1, ml_stat, ml_err)
3076	CASE ( 0 )
3077	IF(l_isend) CALL mpi_wait(ml_req1, ml_stat, ml_err)
3078	IF(l_isend) CALL mpi_wait(ml_req2, ml_stat, ml_err)
3079	CASE ( 1 )
3080	IF(l_isend) CALL mpi_wait(ml_req1, ml_stat, ml_err)
3081	END SELECT
3082	!
3083	! ! Write Dirichlet lateral conditions
3084	ijhom = nlcj-jprecj
3085	!
3086	SELECT CASE ( nbondj_bdy_b(ib_bdy) )
3087	CASE ( -1 )
3088	DO jl = 1, jprecj
3089	ptab(:,ijhom+jl) = zt2ns(:,jl,2)
3090	END DO
3091	CASE ( 0 )
3092	DO jl = 1, jprecj
3093	ptab(:,jl ) = zt2sn(:,jl,2)
3094	ptab(:,ijhom+jl) = zt2ns(:,jl,2)
3095	END DO
3096	CASE ( 1 )
3097	DO jl = 1, jprecj
3098	ptab(:,jl) = zt2sn(:,jl,2)
3099	END DO
3100	END SELECT
3101
3102
3103	! 4. north fold treatment
3104	! -----------------------
3105	!
3106	IF( npolj /= 0) THEN
3107	!
3108	SELECT CASE ( jpni )
3109	CASE ( 1 ) ; CALL lbc_nfd ( ptab, cd_type, psgn ) ! only 1 northern proc, no mpp
3110	CASE DEFAULT ; CALL mpp_lbc_north( ptab, cd_type, psgn ) ! for all northern procs.
3111	END SELECT
3112	!
3113	ENDIF
3114	!
3115	DEALLOCATE( zt2ns, zt2sn, zt2ew, zt2we )
3116	!
3117	END SUBROUTINE mpp_lnk_bdy_2d
3118
3119	SUBROUTINE mpi_init_opa( ldtxt, ksft, code )
3120	!!---------------------------------------------------------------------
3121	!! * routine mpp_init.opa *
3122	!!
3123	!! ** Purpose :: export and attach a MPI buffer for bsend
3124	!!
3125	!! ** Method :: define buffer size in namelist, if 0 no buffer attachment
3126	!! but classical mpi_init
3127	!!
3128	!! History :: 01/11 :: IDRIS initial version for IBM only
3129	!! 08/04 :: R. Benshila, generalisation
3130	!!---------------------------------------------------------------------
3131	CHARACTER(len=*),DIMENSION(:), INTENT( out) :: ldtxt
3132	INTEGER , INTENT(inout) :: ksft
3133	INTEGER , INTENT( out) :: code
3134	INTEGER :: ierr, ji
3135	LOGICAL :: mpi_was_called
3136	!!---------------------------------------------------------------------
3137	!
3138	CALL mpi_initialized( mpi_was_called, code ) ! MPI initialization
3139	IF ( code /= MPI_SUCCESS ) THEN
3140	DO ji = 1, SIZE(ldtxt)
3141	IF( TRIM(ldtxt(ji)) /= '' ) WRITE(,) ldtxt(ji) ! control print of mynode
3142	END DO
3143	WRITE(*, cform_err)
3144	WRITE(, ) ' lib_mpp: Error in routine mpi_initialized'
3145	CALL mpi_abort( mpi_comm_world, code, ierr )
3146	ENDIF
3147	!
3148	IF( .NOT. mpi_was_called ) THEN
3149	CALL mpi_init( code )
3150	CALL mpi_comm_dup( mpi_comm_world, mpi_comm_opa, code )
3151	IF ( code /= MPI_SUCCESS ) THEN
3152	DO ji = 1, SIZE(ldtxt)
3153	IF( TRIM(ldtxt(ji)) /= '' ) WRITE(,) ldtxt(ji) ! control print of mynode
3154	END DO
3155	WRITE(*, cform_err)
3156	WRITE(, ) ' lib_mpp: Error in routine mpi_comm_dup'
3157	CALL mpi_abort( mpi_comm_world, code, ierr )
3158	ENDIF
3159	ENDIF
3160	!
3161	IF( nn_buffer > 0 ) THEN
3162	WRITE(ldtxt(ksft),*) 'mpi_bsend, buffer allocation of : ', nn_buffer ; ksft = ksft + 1
3163	! Buffer allocation and attachment
3164	ALLOCATE( tampon(nn_buffer), stat = ierr )
3165	IF( ierr /= 0 ) THEN
3166	DO ji = 1, SIZE(ldtxt)
3167	IF( TRIM(ldtxt(ji)) /= '' ) WRITE(,) ldtxt(ji) ! control print of mynode
3168	END DO
3169	WRITE(*, cform_err)
3170	WRITE(, ) ' lib_mpp: Error in ALLOCATE', ierr
3171	CALL mpi_abort( mpi_comm_world, code, ierr )
3172	END IF
3173	CALL mpi_buffer_attach( tampon, nn_buffer, code )
3174	ENDIF
3175	!
3176	END SUBROUTINE mpi_init_opa
3177
3178	SUBROUTINE DDPDD_MPI (ydda, yddb, ilen, itype)
3179	!!---------------------------------------------------------------------
3180	!! Routine DDPDD_MPI: used by reduction operator MPI_SUMDD
3181	!!
3182	!! Modification of original codes written by David H. Bailey
3183	!! This subroutine computes yddb(i) = ydda(i)+yddb(i)
3184	!!---------------------------------------------------------------------
3185	INTEGER, INTENT(in) :: ilen, itype
3186	COMPLEX(wp), DIMENSION(ilen), INTENT(in) :: ydda
3187	COMPLEX(wp), DIMENSION(ilen), INTENT(inout) :: yddb
3188	!
3189	REAL(wp) :: zerr, zt1, zt2 ! local work variables
3190	INTEGER :: ji, ztmp ! local scalar
3191
3192	ztmp = itype ! avoid compilation warning
3193
3194	DO ji=1,ilen
3195	! Compute ydda + yddb using Knuth's trick.
3196	zt1 = real(ydda(ji)) + real(yddb(ji))
3197	zerr = zt1 - real(ydda(ji))
3198	zt2 = ((real(yddb(ji)) - zerr) + (real(ydda(ji)) - (zt1 - zerr))) &
3199	+ aimag(ydda(ji)) + aimag(yddb(ji))
3200
3201	! The result is zt1 + zt2, after normalization.
3202	yddb(ji) = cmplx ( zt1 + zt2, zt2 - ((zt1 + zt2) - zt1),wp )
3203	END DO
3204
3205	END SUBROUTINE DDPDD_MPI
3206
3207	SUBROUTINE mpp_lbc_north_icb( pt2d, cd_type, psgn, pr2dj)
3208	!!---------------------------------------------------------------------
3209	!! * routine mpp_lbc_north_icb *
3210	!!
3211	!! ** Purpose : Ensure proper north fold horizontal bondary condition
3212	!! in mpp configuration in case of jpn1 > 1 and for 2d
3213	!! array with outer extra halo
3214	!!
3215	!! ** Method : North fold condition and mpp with more than one proc
3216	!! in i-direction require a specific treatment. We gather
3217	!! the 4+2*jpr2dj northern lines of the global domain on 1
3218	!! processor and apply lbc north-fold on this sub array.
3219	!! Then we scatter the north fold array back to the processors.
3220	!! This version accounts for an extra halo with icebergs.
3221	!!
3222	!!----------------------------------------------------------------------
3223	REAL(wp), DIMENSION(:,:), INTENT(inout) :: pt2d ! 2D array with extra halo
3224	CHARACTER(len=1) , INTENT(in ) :: cd_type ! nature of pt3d grid-points
3225	! ! = T , U , V , F or W -points
3226	REAL(wp) , INTENT(in ) :: psgn ! = -1. the sign change across the
3227	!! ! north fold, = 1. otherwise
3228	INTEGER, OPTIONAL , INTENT(in ) :: pr2dj
3229	INTEGER :: ji, jj, jr
3230	INTEGER :: ierr, itaille, ildi, ilei, iilb
3231	INTEGER :: ijpj, ij, iproc, ipr2dj
3232	!
3233	REAL(wp), DIMENSION(:,:) , ALLOCATABLE :: ztab_e, znorthloc_e
3234	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: znorthgloio_e
3235
3236	!!----------------------------------------------------------------------
3237	!
3238	ijpj=4
3239	IF( PRESENT(pr2dj) ) THEN ! use of additional halos
3240	ipr2dj = pr2dj
3241	ELSE
3242	ipr2dj = 0
3243	ENDIF
3244	ALLOCATE( ztab_e(jpiglo,4+2ipr2dj), znorthloc_e(jpi,4+2ipr2dj), znorthgloio_e(jpi,4+2*ipr2dj,jpni) )
3245
3246	!
3247	ztab_e(:,:) = 0.e0
3248
3249	ij=0
3250	! put in znorthloc_e the last 4 jlines of pt2d
3251	DO jj = nlcj - ijpj + 1 - ipr2dj, nlcj +ipr2dj
3252	ij = ij + 1
3253	DO ji = 1, jpi
3254	znorthloc_e(ji,ij)=pt2d(ji,jj)
3255	END DO
3256	END DO
3257	!
3258	itaille = jpi * ( ijpj + 2 * ipr2dj )
3259	CALL MPI_ALLGATHER( znorthloc_e(1,1) , itaille, MPI_DOUBLE_PRECISION, &
3260	& znorthgloio_e(1,1,1), itaille, MPI_DOUBLE_PRECISION, ncomm_north, ierr )
3261	!
3262	DO jr = 1, ndim_rank_north ! recover the global north array
3263	iproc = nrank_north(jr) + 1
3264	ildi = nldit (iproc)
3265	ilei = nleit (iproc)
3266	iilb = nimppt(iproc)
3267	DO jj = 1, ijpj+2*ipr2dj
3268	DO ji = ildi, ilei
3269	ztab_e(ji+iilb-1,jj) = znorthgloio_e(ji,jj,jr)
3270	END DO
3271	END DO
3272	END DO
3273
3274
3275	! 2. North-Fold boundary conditions
3276	! ----------------------------------
3277	CALL lbc_nfd( ztab_e(:,:), cd_type, psgn, pr2dj = ipr2dj )
3278
3279	ij = ipr2dj
3280	!! Scatter back to pt2d
3281	DO jj = nlcj - ijpj + 1 , nlcj +ipr2dj
3282	ij = ij +1
3283	DO ji= 1, nlci
3284	pt2d(ji,jj) = ztab_e(ji+nimpp-1,ij)
3285	END DO
3286	END DO
3287	!
3288	DEALLOCATE( ztab_e, znorthloc_e, znorthgloio_e )
3289	!
3290	END SUBROUTINE mpp_lbc_north_icb
3291
3292	SUBROUTINE mpp_lnk_2d_icb( pt2d, cd_type, psgn, jpri, jprj )
3293	!!----------------------------------------------------------------------
3294	!! * routine mpp_lnk_2d_icb *
3295	!!
3296	!! ** Purpose : Message passing manadgement for 2d array (with extra halo and icebergs)
3297	!!
3298	!! ** Method : Use mppsend and mpprecv function for passing mask
3299	!! between processors following neighboring subdomains.
3300	!! domain parameters
3301	!! nlci : first dimension of the local subdomain
3302	!! nlcj : second dimension of the local subdomain
3303	!! jpri : number of rows for extra outer halo
3304	!! jprj : number of columns for extra outer halo
3305	!! nbondi : mark for "east-west local boundary"
3306	!! nbondj : mark for "north-south local boundary"
3307	!! noea : number for local neighboring processors
3308	!! nowe : number for local neighboring processors
3309	!! noso : number for local neighboring processors
3310	!! nono : number for local neighboring processors
3311	!!
3312	!!----------------------------------------------------------------------
3313	INTEGER , INTENT(in ) :: jpri
3314	INTEGER , INTENT(in ) :: jprj
3315	REAL(wp), DIMENSION(1-jpri:jpi+jpri,1-jprj:jpj+jprj), INTENT(inout) :: pt2d ! 2D array with extra halo
3316	CHARACTER(len=1) , INTENT(in ) :: cd_type ! nature of ptab array grid-points
3317	! ! = T , U , V , F , W and I points
3318	REAL(wp) , INTENT(in ) :: psgn ! =-1 the sign change across the
3319	!! ! north boundary, = 1. otherwise
3320	INTEGER :: jl ! dummy loop indices
3321	INTEGER :: imigr, iihom, ijhom ! temporary integers
3322	INTEGER :: ipreci, iprecj ! temporary integers
3323	INTEGER :: ml_req1, ml_req2, ml_err ! for key_mpi_isend
3324	INTEGER, DIMENSION(MPI_STATUS_SIZE) :: ml_stat ! for key_mpi_isend
3325	!!
3326	REAL(wp), DIMENSION(1-jpri:jpi+jpri,jprecj+jprj,2) :: r2dns
3327	REAL(wp), DIMENSION(1-jpri:jpi+jpri,jprecj+jprj,2) :: r2dsn
3328	REAL(wp), DIMENSION(1-jprj:jpj+jprj,jpreci+jpri,2) :: r2dwe
3329	REAL(wp), DIMENSION(1-jprj:jpj+jprj,jpreci+jpri,2) :: r2dew
3330	!!----------------------------------------------------------------------
3331
3332	ipreci = jpreci + jpri ! take into account outer extra 2D overlap area
3333	iprecj = jprecj + jprj
3334
3335
3336	! 1. standard boundary treatment
3337	! ------------------------------
3338	! Order matters Here !!!!
3339	!
3340	! ! East-West boundaries
3341	! !* Cyclic east-west
3342	IF( nbondi == 2 .AND. (nperio == 1 .OR. nperio == 4 .OR. nperio == 6) ) THEN
3343	pt2d(1-jpri: 1 ,:) = pt2d(jpim1-jpri: jpim1 ,:) ! east
3344	pt2d( jpi :jpi+jpri,:) = pt2d( 2 :2+jpri,:) ! west
3345	!
3346	ELSE !* closed
3347	IF( .NOT. cd_type == 'F' ) pt2d( 1-jpri :jpreci ,:) = 0.e0 ! south except at F-point
3348	pt2d(nlci-jpreci+1:jpi+jpri,:) = 0.e0 ! north
3349	ENDIF
3350	!
3351
3352	! north fold treatment
3353	! -----------------------
3354	IF( npolj /= 0 ) THEN
3355	!
3356	SELECT CASE ( jpni )
3357	CASE ( 1 ) ; CALL lbc_nfd ( pt2d(1:jpi,1:jpj+jprj), cd_type, psgn, pr2dj=jprj )
3358	CASE DEFAULT ; CALL mpp_lbc_north_icb( pt2d(1:jpi,1:jpj+jprj) , cd_type, psgn , pr2dj=jprj )
3359	END SELECT
3360	!
3361	ENDIF
3362
3363	! 2. East and west directions exchange
3364	! ------------------------------------
3365	! we play with the neigbours AND the row number because of the periodicity
3366	!
3367	SELECT CASE ( nbondi ) ! Read Dirichlet lateral conditions
3368	CASE ( -1, 0, 1 ) ! all exept 2 (i.e. close case)
3369	iihom = nlci-nreci-jpri
3370	DO jl = 1, ipreci
3371	r2dew(:,jl,1) = pt2d(jpreci+jl,:)
3372	r2dwe(:,jl,1) = pt2d(iihom +jl,:)
3373	END DO
3374	END SELECT
3375	!
3376	! ! Migrations
3377	imigr = ipreci * ( jpj + 2*jprj)
3378	!
3379	SELECT CASE ( nbondi )
3380	CASE ( -1 )
3381	CALL mppsend( 2, r2dwe(1-jprj,1,1), imigr, noea, ml_req1 )
3382	CALL mpprecv( 1, r2dew(1-jprj,1,2), imigr, noea )
3383	IF(l_isend) CALL mpi_wait(ml_req1,ml_stat,ml_err)
3384	CASE ( 0 )
3385	CALL mppsend( 1, r2dew(1-jprj,1,1), imigr, nowe, ml_req1 )
3386	CALL mppsend( 2, r2dwe(1-jprj,1,1), imigr, noea, ml_req2 )
3387	CALL mpprecv( 1, r2dew(1-jprj,1,2), imigr, noea )
3388	CALL mpprecv( 2, r2dwe(1-jprj,1,2), imigr, nowe )
3389	IF(l_isend) CALL mpi_wait(ml_req1,ml_stat,ml_err)
3390	IF(l_isend) CALL mpi_wait(ml_req2,ml_stat,ml_err)
3391	CASE ( 1 )
3392	CALL mppsend( 1, r2dew(1-jprj,1,1), imigr, nowe, ml_req1 )
3393	CALL mpprecv( 2, r2dwe(1-jprj,1,2), imigr, nowe )
3394	IF(l_isend) CALL mpi_wait(ml_req1,ml_stat,ml_err)
3395	END SELECT
3396	!
3397	! ! Write Dirichlet lateral conditions
3398	iihom = nlci - jpreci
3399	!
3400	SELECT CASE ( nbondi )
3401	CASE ( -1 )
3402	DO jl = 1, ipreci
3403	pt2d(iihom+jl,:) = r2dew(:,jl,2)
3404	END DO
3405	CASE ( 0 )
3406	DO jl = 1, ipreci
3407	pt2d(jl-jpri,:) = r2dwe(:,jl,2)
3408	pt2d( iihom+jl,:) = r2dew(:,jl,2)
3409	END DO
3410	CASE ( 1 )
3411	DO jl = 1, ipreci
3412	pt2d(jl-jpri,:) = r2dwe(:,jl,2)
3413	END DO
3414	END SELECT
3415
3416
3417	! 3. North and south directions
3418	! -----------------------------
3419	! always closed : we play only with the neigbours
3420	!
3421	IF( nbondj /= 2 ) THEN ! Read Dirichlet lateral conditions
3422	ijhom = nlcj-nrecj-jprj
3423	DO jl = 1, iprecj
3424	r2dsn(:,jl,1) = pt2d(:,ijhom +jl)
3425	r2dns(:,jl,1) = pt2d(:,jprecj+jl)
3426	END DO
3427	ENDIF
3428	!
3429	! ! Migrations
3430	imigr = iprecj * ( jpi + 2*jpri )
3431	!
3432	SELECT CASE ( nbondj )
3433	CASE ( -1 )
3434	CALL mppsend( 4, r2dsn(1-jpri,1,1), imigr, nono, ml_req1 )
3435	CALL mpprecv( 3, r2dns(1-jpri,1,2), imigr, nono )
3436	IF(l_isend) CALL mpi_wait(ml_req1,ml_stat,ml_err)
3437	CASE ( 0 )
3438	CALL mppsend( 3, r2dns(1-jpri,1,1), imigr, noso, ml_req1 )
3439	CALL mppsend( 4, r2dsn(1-jpri,1,1), imigr, nono, ml_req2 )
3440	CALL mpprecv( 3, r2dns(1-jpri,1,2), imigr, nono )
3441	CALL mpprecv( 4, r2dsn(1-jpri,1,2), imigr, noso )
3442	IF(l_isend) CALL mpi_wait(ml_req1,ml_stat,ml_err)
3443	IF(l_isend) CALL mpi_wait(ml_req2,ml_stat,ml_err)
3444	CASE ( 1 )
3445	CALL mppsend( 3, r2dns(1-jpri,1,1), imigr, noso, ml_req1 )
3446	CALL mpprecv( 4, r2dsn(1-jpri,1,2), imigr, noso )
3447	IF(l_isend) CALL mpi_wait(ml_req1,ml_stat,ml_err)
3448	END SELECT
3449	!
3450	! ! Write Dirichlet lateral conditions
3451	ijhom = nlcj - jprecj
3452	!
3453	SELECT CASE ( nbondj )
3454	CASE ( -1 )
3455	DO jl = 1, iprecj
3456	pt2d(:,ijhom+jl) = r2dns(:,jl,2)
3457	END DO
3458	CASE ( 0 )
3459	DO jl = 1, iprecj
3460	pt2d(:,jl-jprj) = r2dsn(:,jl,2)
3461	pt2d(:,ijhom+jl ) = r2dns(:,jl,2)
3462	END DO
3463	CASE ( 1 )
3464	DO jl = 1, iprecj
3465	pt2d(:,jl-jprj) = r2dsn(:,jl,2)
3466	END DO
3467	END SELECT
3468
3469	END SUBROUTINE mpp_lnk_2d_icb
3470	#else
3471	!!----------------------------------------------------------------------
3472	!! Default case: Dummy module share memory computing
3473	!!----------------------------------------------------------------------
3474	USE in_out_manager
3475
3476	INTERFACE mpp_sum
3477	MODULE PROCEDURE mpp_sum_a2s, mpp_sum_as, mpp_sum_ai, mpp_sum_s, mpp_sum_i, mppsum_realdd, mppsum_a_realdd
3478	END INTERFACE
3479	INTERFACE mpp_max
3480	MODULE PROCEDURE mppmax_a_int, mppmax_int, mppmax_a_real, mppmax_real
3481	END INTERFACE
3482	INTERFACE mpp_min
3483	MODULE PROCEDURE mppmin_a_int, mppmin_int, mppmin_a_real, mppmin_real
3484	END INTERFACE
3485	INTERFACE mpp_minloc
3486	MODULE PROCEDURE mpp_minloc2d ,mpp_minloc3d
3487	END INTERFACE
3488	INTERFACE mpp_maxloc
3489	MODULE PROCEDURE mpp_maxloc2d ,mpp_maxloc3d
3490	END INTERFACE
3491
3492	LOGICAL, PUBLIC, PARAMETER :: lk_mpp = .FALSE. !: mpp flag
3493	LOGICAL, PUBLIC :: ln_nnogather !: namelist control of northfold comms (needed here in case "key_mpp_mpi" is not used)
3494	INTEGER :: ncomm_ice
3495	INTEGER, PUBLIC :: mpi_comm_opa ! opa local communicator
3496	!!----------------------------------------------------------------------
3497	CONTAINS
3498
3499	INTEGER FUNCTION lib_mpp_alloc(kumout) ! Dummy function
3500	INTEGER, INTENT(in) :: kumout
3501	lib_mpp_alloc = 0
3502	END FUNCTION lib_mpp_alloc
3503
3504	FUNCTION mynode( ldtxt, ldname, kumnam_ref, knumnam_cfg, kumond , kstop, localComm ) RESULT (function_value)
3505	INTEGER, OPTIONAL , INTENT(in ) :: localComm
3506	CHARACTER(len=*),DIMENSION(:) :: ldtxt
3507	CHARACTER(len=*) :: ldname
3508	INTEGER :: kumnam_ref, knumnam_cfg , kumond , kstop
3509	IF( PRESENT( localComm ) ) mpi_comm_opa = localComm
3510	function_value = 0
3511	IF( .FALSE. ) ldtxt(:) = 'never done'
3512	CALL ctl_opn( kumond, TRIM(ldname), 'UNKNOWN', 'FORMATTED', 'SEQUENTIAL', -1, 6, .FALSE. , 1 )
3513	END FUNCTION mynode
3514
3515	SUBROUTINE mppsync ! Dummy routine
3516	END SUBROUTINE mppsync
3517
3518	SUBROUTINE mpp_sum_as( parr, kdim, kcom ) ! Dummy routine
3519	REAL , DIMENSION(:) :: parr
3520	INTEGER :: kdim
3521	INTEGER, OPTIONAL :: kcom
3522	WRITE(,) 'mpp_sum_as: You should not have seen this print! error?', kdim, parr(1), kcom
3523	END SUBROUTINE mpp_sum_as
3524
3525	SUBROUTINE mpp_sum_a2s( parr, kdim, kcom ) ! Dummy routine
3526	REAL , DIMENSION(:,:) :: parr
3527	INTEGER :: kdim
3528	INTEGER, OPTIONAL :: kcom
3529	WRITE(,) 'mpp_sum_a2s: You should not have seen this print! error?', kdim, parr(1,1), kcom
3530	END SUBROUTINE mpp_sum_a2s
3531
3532	SUBROUTINE mpp_sum_ai( karr, kdim, kcom ) ! Dummy routine
3533	INTEGER, DIMENSION(:) :: karr
3534	INTEGER :: kdim
3535	INTEGER, OPTIONAL :: kcom
3536	WRITE(,) 'mpp_sum_ai: You should not have seen this print! error?', kdim, karr(1), kcom
3537	END SUBROUTINE mpp_sum_ai
3538
3539	SUBROUTINE mpp_sum_s( psca, kcom ) ! Dummy routine
3540	REAL :: psca
3541	INTEGER, OPTIONAL :: kcom
3542	WRITE(,) 'mpp_sum_s: You should not have seen this print! error?', psca, kcom
3543	END SUBROUTINE mpp_sum_s
3544
3545	SUBROUTINE mpp_sum_i( kint, kcom ) ! Dummy routine
3546	integer :: kint
3547	INTEGER, OPTIONAL :: kcom
3548	WRITE(,) 'mpp_sum_i: You should not have seen this print! error?', kint, kcom
3549	END SUBROUTINE mpp_sum_i
3550
3551	SUBROUTINE mppsum_realdd( ytab, kcom )
3552	COMPLEX(wp), INTENT(inout) :: ytab ! input scalar
3553	INTEGER , INTENT( in ), OPTIONAL :: kcom
3554	WRITE(,) 'mppsum_realdd: You should not have seen this print! error?', ytab
3555	END SUBROUTINE mppsum_realdd
3556
3557	SUBROUTINE mppsum_a_realdd( ytab, kdim, kcom )
3558	INTEGER , INTENT( in ) :: kdim ! size of ytab
3559	COMPLEX(wp), DIMENSION(kdim), INTENT( inout ) :: ytab ! input array
3560	INTEGER , INTENT( in ), OPTIONAL :: kcom
3561	WRITE(,) 'mppsum_a_realdd: You should not have seen this print! error?', kdim, ytab(1), kcom
3562	END SUBROUTINE mppsum_a_realdd
3563
3564	SUBROUTINE mppmax_a_real( parr, kdim, kcom )
3565	REAL , DIMENSION(:) :: parr
3566	INTEGER :: kdim
3567	INTEGER, OPTIONAL :: kcom
3568	WRITE(,) 'mppmax_a_real: You should not have seen this print! error?', kdim, parr(1), kcom
3569	END SUBROUTINE mppmax_a_real
3570
3571	SUBROUTINE mppmax_real( psca, kcom )
3572	REAL :: psca
3573	INTEGER, OPTIONAL :: kcom
3574	WRITE(,) 'mppmax_real: You should not have seen this print! error?', psca, kcom
3575	END SUBROUTINE mppmax_real
3576
3577	SUBROUTINE mppmin_a_real( parr, kdim, kcom )
3578	REAL , DIMENSION(:) :: parr
3579	INTEGER :: kdim
3580	INTEGER, OPTIONAL :: kcom
3581	WRITE(,) 'mppmin_a_real: You should not have seen this print! error?', kdim, parr(1), kcom
3582	END SUBROUTINE mppmin_a_real
3583
3584	SUBROUTINE mppmin_real( psca, kcom )
3585	REAL :: psca
3586	INTEGER, OPTIONAL :: kcom
3587	WRITE(,) 'mppmin_real: You should not have seen this print! error?', psca, kcom
3588	END SUBROUTINE mppmin_real
3589
3590	SUBROUTINE mppmax_a_int( karr, kdim ,kcom)
3591	INTEGER, DIMENSION(:) :: karr
3592	INTEGER :: kdim
3593	INTEGER, OPTIONAL :: kcom
3594	WRITE(,) 'mppmax_a_int: You should not have seen this print! error?', kdim, karr(1), kcom
3595	END SUBROUTINE mppmax_a_int
3596
3597	SUBROUTINE mppmax_int( kint, kcom)
3598	INTEGER :: kint
3599	INTEGER, OPTIONAL :: kcom
3600	WRITE(,) 'mppmax_int: You should not have seen this print! error?', kint, kcom
3601	END SUBROUTINE mppmax_int
3602
3603	SUBROUTINE mppmin_a_int( karr, kdim, kcom )
3604	INTEGER, DIMENSION(:) :: karr
3605	INTEGER :: kdim
3606	INTEGER, OPTIONAL :: kcom
3607	WRITE(,) 'mppmin_a_int: You should not have seen this print! error?', kdim, karr(1), kcom
3608	END SUBROUTINE mppmin_a_int
3609
3610	SUBROUTINE mppmin_int( kint, kcom )
3611	INTEGER :: kint
3612	INTEGER, OPTIONAL :: kcom
3613	WRITE(,) 'mppmin_int: You should not have seen this print! error?', kint, kcom
3614	END SUBROUTINE mppmin_int
3615
3616	SUBROUTINE mpp_minloc2d( ptab, pmask, pmin, ki, kj )
3617	REAL :: pmin
3618	REAL , DIMENSION (:,:) :: ptab, pmask
3619	INTEGER :: ki, kj
3620	WRITE(,) 'mpp_minloc2d: You should not have seen this print! error?', pmin, ki, kj, ptab(1,1), pmask(1,1)
3621	END SUBROUTINE mpp_minloc2d
3622
3623	SUBROUTINE mpp_minloc3d( ptab, pmask, pmin, ki, kj, kk )
3624	REAL :: pmin
3625	REAL , DIMENSION (:,:,:) :: ptab, pmask
3626	INTEGER :: ki, kj, kk
3627	WRITE(,) 'mpp_minloc3d: You should not have seen this print! error?', pmin, ki, kj, kk, ptab(1,1,1), pmask(1,1,1)
3628	END SUBROUTINE mpp_minloc3d
3629
3630	SUBROUTINE mpp_maxloc2d( ptab, pmask, pmax, ki, kj )
3631	REAL :: pmax
3632	REAL , DIMENSION (:,:) :: ptab, pmask
3633	INTEGER :: ki, kj
3634	WRITE(,) 'mpp_maxloc2d: You should not have seen this print! error?', pmax, ki, kj, ptab(1,1), pmask(1,1)
3635	END SUBROUTINE mpp_maxloc2d
3636
3637	SUBROUTINE mpp_maxloc3d( ptab, pmask, pmax, ki, kj, kk )
3638	REAL :: pmax
3639	REAL , DIMENSION (:,:,:) :: ptab, pmask
3640	INTEGER :: ki, kj, kk
3641	WRITE(,) 'mpp_maxloc3d: You should not have seen this print! error?', pmax, ki, kj, kk, ptab(1,1,1), pmask(1,1,1)
3642	END SUBROUTINE mpp_maxloc3d
3643
3644	SUBROUTINE mppstop
3645	STOP ! non MPP case, just stop the run
3646	END SUBROUTINE mppstop
3647
3648	SUBROUTINE mpp_ini_ice( kcom, knum )
3649	INTEGER :: kcom, knum
3650	WRITE(,) 'mpp_ini_ice: You should not have seen this print! error?', kcom, knum
3651	END SUBROUTINE mpp_ini_ice
3652
3653	SUBROUTINE mpp_ini_znl( knum )
3654	INTEGER :: knum
3655	WRITE(,) 'mpp_ini_znl: You should not have seen this print! error?', knum
3656	END SUBROUTINE mpp_ini_znl
3657
3658	SUBROUTINE mpp_comm_free( kcom )
3659	INTEGER :: kcom
3660	WRITE(,) 'mpp_comm_free: You should not have seen this print! error?', kcom
3661	END SUBROUTINE mpp_comm_free
3662	#endif
3663
3664	!!----------------------------------------------------------------------
3665	!! All cases: ctl_stop, ctl_warn, get_unit, ctl_opn, ctl_nam routines
3666	!!----------------------------------------------------------------------
3667
3668	SUBROUTINE ctl_stop( cd1, cd2, cd3, cd4, cd5 , &
3669	& cd6, cd7, cd8, cd9, cd10 )
3670	!!----------------------------------------------------------------------
3671	!! * ROUTINE stop_opa *
3672	!!
3673	!! ** Purpose : print in ocean.outpput file a error message and
3674	!! increment the error number (nstop) by one.
3675	!!----------------------------------------------------------------------
3676	CHARACTER(len=*), INTENT(in), OPTIONAL :: cd1, cd2, cd3, cd4, cd5
3677	CHARACTER(len=*), INTENT(in), OPTIONAL :: cd6, cd7, cd8, cd9, cd10
3678	!!----------------------------------------------------------------------
3679	!
3680	nstop = nstop + 1
3681	IF(lwp) THEN
3682	WRITE(numout,cform_err)
3683	IF( PRESENT(cd1 ) ) WRITE(numout,*) cd1
3684	IF( PRESENT(cd2 ) ) WRITE(numout,*) cd2
3685	IF( PRESENT(cd3 ) ) WRITE(numout,*) cd3
3686	IF( PRESENT(cd4 ) ) WRITE(numout,*) cd4
3687	IF( PRESENT(cd5 ) ) WRITE(numout,*) cd5
3688	IF( PRESENT(cd6 ) ) WRITE(numout,*) cd6
3689	IF( PRESENT(cd7 ) ) WRITE(numout,*) cd7
3690	IF( PRESENT(cd8 ) ) WRITE(numout,*) cd8
3691	IF( PRESENT(cd9 ) ) WRITE(numout,*) cd9
3692	IF( PRESENT(cd10) ) WRITE(numout,*) cd10
3693	ENDIF
3694	CALL FLUSH(numout )
3695	IF( numstp /= -1 ) CALL FLUSH(numstp )
3696	IF( numsol /= -1 ) CALL FLUSH(numsol )
3697	IF( numevo_ice /= -1 ) CALL FLUSH(numevo_ice)
3698	!
3699	IF( cd1 == 'STOP' ) THEN
3700	IF(lwp) WRITE(numout,*) 'huge E-R-R-O-R : immediate stop'
3701	CALL mppstop()
3702	ENDIF
3703	!
3704	END SUBROUTINE ctl_stop
3705
3706
3707	SUBROUTINE ctl_warn( cd1, cd2, cd3, cd4, cd5, &
3708	& cd6, cd7, cd8, cd9, cd10 )
3709	!!----------------------------------------------------------------------
3710	!! * ROUTINE stop_warn *
3711	!!
3712	!! ** Purpose : print in ocean.outpput file a error message and
3713	!! increment the warning number (nwarn) by one.
3714	!!----------------------------------------------------------------------
3715	CHARACTER(len=*), INTENT(in), OPTIONAL :: cd1, cd2, cd3, cd4, cd5
3716	CHARACTER(len=*), INTENT(in), OPTIONAL :: cd6, cd7, cd8, cd9, cd10
3717	!!----------------------------------------------------------------------
3718	!
3719	nwarn = nwarn + 1
3720	IF(lwp) THEN
3721	WRITE(numout,cform_war)
3722	IF( PRESENT(cd1 ) ) WRITE(numout,*) cd1
3723	IF( PRESENT(cd2 ) ) WRITE(numout,*) cd2
3724	IF( PRESENT(cd3 ) ) WRITE(numout,*) cd3
3725	IF( PRESENT(cd4 ) ) WRITE(numout,*) cd4
3726	IF( PRESENT(cd5 ) ) WRITE(numout,*) cd5
3727	IF( PRESENT(cd6 ) ) WRITE(numout,*) cd6
3728	IF( PRESENT(cd7 ) ) WRITE(numout,*) cd7
3729	IF( PRESENT(cd8 ) ) WRITE(numout,*) cd8
3730	IF( PRESENT(cd9 ) ) WRITE(numout,*) cd9
3731	IF( PRESENT(cd10) ) WRITE(numout,*) cd10
3732	ENDIF
3733	CALL FLUSH(numout)
3734	!
3735	END SUBROUTINE ctl_warn
3736
3737
3738	SUBROUTINE ctl_opn( knum, cdfile, cdstat, cdform, cdacce, klengh, kout, ldwp, karea )
3739	!!----------------------------------------------------------------------
3740	!! * ROUTINE ctl_opn *
3741	!!
3742	!! ** Purpose : Open file and check if required file is available.
3743	!!
3744	!! ** Method : Fortan open
3745	!!----------------------------------------------------------------------
3746	INTEGER , INTENT( out) :: knum ! logical unit to open
3747	CHARACTER(len=*) , INTENT(in ) :: cdfile ! file name to open
3748	CHARACTER(len=*) , INTENT(in ) :: cdstat ! disposition specifier
3749	CHARACTER(len=*) , INTENT(in ) :: cdform ! formatting specifier
3750	CHARACTER(len=*) , INTENT(in ) :: cdacce ! access specifier
3751	INTEGER , INTENT(in ) :: klengh ! record length
3752	INTEGER , INTENT(in ) :: kout ! number of logical units for write
3753	LOGICAL , INTENT(in ) :: ldwp ! boolean term for print
3754	INTEGER, OPTIONAL, INTENT(in ) :: karea ! proc number
3755	!!
3756	CHARACTER(len=80) :: clfile
3757	INTEGER :: iost
3758	!!----------------------------------------------------------------------
3759
3760	! adapt filename
3761	! ----------------
3762	clfile = TRIM(cdfile)
3763	IF( PRESENT( karea ) ) THEN
3764	IF( karea > 1 ) WRITE(clfile, "(a,'_',i4.4)") TRIM(clfile), karea-1
3765	ENDIF
3766	#if defined key_agrif
3767	IF( .NOT. Agrif_Root() ) clfile = TRIM(Agrif_CFixed())//'_'//TRIM(clfile)
3768	knum=Agrif_Get_Unit()
3769	#else
3770	knum=get_unit()
3771	#endif
3772
3773	iost=0
3774	IF( cdacce(1:6) == 'DIRECT' ) THEN
3775	OPEN( UNIT=knum, FILE=clfile, FORM=cdform, ACCESS=cdacce, STATUS=cdstat, RECL=klengh, ERR=100, IOSTAT=iost )
3776	ELSE
3777	OPEN( UNIT=knum, FILE=clfile, FORM=cdform, ACCESS=cdacce, STATUS=cdstat , ERR=100, IOSTAT=iost )
3778	ENDIF
3779	IF( iost == 0 ) THEN
3780	IF(ldwp) THEN
3781	WRITE(kout,*) ' file : ', clfile,' open ok'
3782	WRITE(kout,*) ' unit = ', knum
3783	WRITE(kout,*) ' status = ', cdstat
3784	WRITE(kout,*) ' form = ', cdform
3785	WRITE(kout,*) ' access = ', cdacce
3786	WRITE(kout,*)
3787	ENDIF
3788	ENDIF
3789	100 CONTINUE
3790	IF( iost /= 0 ) THEN
3791	IF(ldwp) THEN
3792	WRITE(kout,*)
3793	WRITE(kout,*) ' ===>>>> : bad opening file: ', clfile
3794	WRITE(kout,*) ' ======= === '
3795	WRITE(kout,*) ' unit = ', knum
3796	WRITE(kout,*) ' status = ', cdstat
3797	WRITE(kout,*) ' form = ', cdform
3798	WRITE(kout,*) ' access = ', cdacce
3799	WRITE(kout,*) ' iostat = ', iost
3800	WRITE(kout,*) ' we stop. verify the file '
3801	WRITE(kout,*)
3802	ENDIF
3803	CALL ctl_stop ('STOP', 'NEMO abort ctl_opn bad opening')
3804	ENDIF
3805
3806	END SUBROUTINE ctl_opn
3807
3808	SUBROUTINE ctl_nam ( kios, cdnam, ldwp )
3809	!!----------------------------------------------------------------------
3810	!! * ROUTINE ctl_nam *
3811	!!
3812	!! ** Purpose : Informations when error while reading a namelist
3813	!!
3814	!! ** Method : Fortan open
3815	!!----------------------------------------------------------------------
3816	INTEGER , INTENT(inout) :: kios ! IO status after reading the namelist
3817	CHARACTER(len=*) , INTENT(in ) :: cdnam ! group name of namelist for which error occurs
3818	CHARACTER(len=4) :: clios ! string to convert iostat in character for print
3819	LOGICAL , INTENT(in ) :: ldwp ! boolean term for print
3820	!!----------------------------------------------------------------------
3821
3822	!
3823	! ----------------
3824	WRITE (clios, '(I4.0)') kios
3825	IF( kios < 0 ) THEN
3826	CALL ctl_warn( 'W A R N I N G: end of record or file while reading namelist ' &
3827	& // TRIM(cdnam) // ' iostat = ' // TRIM(clios) )
3828	ENDIF
3829
3830	IF( kios > 0 ) THEN
3831	CALL ctl_stop( 'E R R O R : misspelled variable in namelist ' &
3832	& // TRIM(cdnam) // ' iostat = ' // TRIM(clios) )
3833	ENDIF
3834	kios = 0
3835	RETURN
3836
3837	END SUBROUTINE ctl_nam
3838
3839	INTEGER FUNCTION get_unit()
3840	!!----------------------------------------------------------------------
3841	!! * FUNCTION get_unit *
3842	!!
3843	!! ** Purpose : return the index of an unused logical unit
3844	!!----------------------------------------------------------------------
3845	LOGICAL :: llopn
3846	!!----------------------------------------------------------------------
3847	!
3848	get_unit = 15 ! choose a unit that is big enough then it is not already used in NEMO
3849	llopn = .TRUE.
3850	DO WHILE( (get_unit < 998) .AND. llopn )
3851	get_unit = get_unit + 1
3852	INQUIRE( unit = get_unit, opened = llopn )
3853	END DO
3854	IF( (get_unit == 999) .AND. llopn ) THEN
3855	CALL ctl_stop( 'get_unit: All logical units until 999 are used...' )
3856	get_unit = -1
3857	ENDIF
3858	!
3859	END FUNCTION get_unit
3860
3861	!!----------------------------------------------------------------------
3862	END MODULE lib_mpp

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