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nemogcm.F90 in branches/2017/dev_r8126_ROBUST08_no_ghost/NEMOGCM/NEMO/OFF_SRC – NEMO

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source: branches/2017/dev_r8126_ROBUST08_no_ghost/NEMOGCM/NEMO/OFF_SRC/nemogcm.F90 @ 8314

Last change on this file since 8314 was 8314, checked in by acc, 7 years ago
Branch 2017/dev_r8126_ROBUST08_no_ghost. Merge in changes from branches/2017/dev_r8126_ROBUST10_MPPINI to combine mppini and mppini_2 functionalities into a single routine. SETTE-like test performed with ORCA2LIMPISCES using an 8x8 partition with 60 processors to confirm consistency of results when using land suppression. The dev_r8126_ROBUST10_MPPINI branch will not be needed in the 2017 merge if dev_r8126_ROBUST08_no_ghost is included.
Property svn:keywords set to `Id`
File size: 31.4 KB

Line
1	MODULE nemogcm
2	!!======================================================================
3	!! * MODULE nemogcm *
4	!! Off-line Ocean : passive tracer evolution, dynamics read in files
5	!!======================================================================
6	!! History : 3.3 ! 2010-05 (C. Ethe) Full reorganization of the off-line: phasing with the on-line
7	!! 3.4 ! 2011-01 (C. Ethe, A. R. Porter, STFC Daresbury) dynamical allocation
8	!! 4.0 ! 2016-10 (C. Ethe, G. Madec, S. Flavoni) domain configuration / user defined interface
9	!!----------------------------------------------------------------------
10
11	!!----------------------------------------------------------------------
12	!! nemo_gcm : off-line: solve ocean tracer only
13	!! nemo_init : initialization of the nemo model
14	!! nemo_ctl : initialisation of algorithm flag
15	!! nemo_closefile : close remaining files
16	!!----------------------------------------------------------------------
17	USE dom_oce ! ocean space domain variables
18	USE oce ! dynamics and tracers variables
19	USE trc_oce ! Shared ocean/passive tracers variables
20	USE c1d ! 1D configuration
21	USE domain ! domain initialization from coordinate & bathymetry (dom_init routine)
22	USE usrdef_nam ! user defined configuration
23	USE eosbn2 ! equation of state (eos bn2 routine)
24	! ! ocean physics
25	USE ldftra ! lateral diffusivity setting (ldf_tra_init routine)
26	USE ldfslp ! slopes of neutral surfaces (ldf_slp_init routine)
27	USE traqsr ! solar radiation penetration (tra_qsr_init routine)
28	USE trabbl ! bottom boundary layer (tra_bbl_init routine)
29	USE traldf ! lateral physics (tra_ldf_init routine)
30	USE zdfini ! vertical physics: initialization
31	USE sbcmod ! surface boundary condition (sbc_init routine)
32	USE phycst ! physical constant (par_cst routine)
33	USE dtadyn ! Lecture and Interpolation of the dynamical fields
34	USE trcini ! Initilization of the passive tracers
35	USE daymod ! calendar (day routine)
36	USE trcstp ! passive tracer time-stepping (trc_stp routine)
37	USE dtadyn ! Lecture and interpolation of the dynamical fields
38	! ! Passive tracers needs
39	USE trc ! passive tracer : variables
40	USE trcnam ! passive tracer : namelist
41	USE trcrst ! passive tracer restart
42	USE diaptr ! Need to initialise this as some variables are used in if statements later
43	USE sbc_oce , ONLY : ln_rnf
44	USE sbcrnf ! surface boundary condition : runoffs
45	! ! I/O & MPP
46	USE iom ! I/O library
47	USE in_out_manager ! I/O manager
48	USE mppini ! shared/distributed memory setting (mpp_init routine)
49	USE lib_mpp ! distributed memory computing
50	#if defined key_iomput
51	USE xios
52	#endif
53	USE prtctl ! Print control (prt_ctl_init routine)
54	USE timing ! Timing
55	USE lib_fortran ! Fortran utilities (allows no signed zero when 'key_nosignedzero' defined)
56	USE lbcnfd, ONLY: isendto, nsndto, nfsloop, nfeloop ! Setup of north fold exchanges
57
58
59
60	IMPLICIT NONE
61	PRIVATE
62
63	PUBLIC nemo_gcm ! called by nemo.F90
64
65	CHARACTER (len=64) :: cform_aaa="( /, 'AAAAAAAA', / ) " ! flag for output listing
66
67	!!----------------------------------------------------------------------
68	!! NEMO/OPA 3.7 , NEMO Consortium (2016)
69	!! $Id$
70	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
71	!!----------------------------------------------------------------------
72	CONTAINS
73
74	SUBROUTINE nemo_gcm
75	!!----------------------------------------------------------------------
76	!! * ROUTINE nemo_gcm *
77	!!
78	!! ** Purpose : nemo solves the primitive equations on an orthogonal
79	!! curvilinear mesh on the sphere.
80	!!
81	!! ** Method : - model general initialization
82	!! - launch the time-stepping (dta_dyn and trc_stp)
83	!! - finalize the run by closing files and communications
84	!!
85	!! References : Madec, Delecluse,Imbard, and Levy, 1997: internal report, IPSL.
86	!! Madec, 2008, internal report, IPSL.
87	!!----------------------------------------------------------------------
88	INTEGER :: istp, indic ! time step index
89	!!----------------------------------------------------------------------
90
91	CALL nemo_init ! Initializations
92
93	! check that all process are still there... If some process have an error,
94	! they will never enter in step and other processes will wait until the end of the cpu time!
95	IF( lk_mpp ) CALL mpp_max( nstop )
96
97	! !-----------------------!
98	! !== time stepping ==!
99	! !-----------------------!
100	istp = nit000
101	!
102	! Initialize arrays of runoffs structures and read data from the namelist
103	IF ( ln_rnf ) CALL sbc_rnf(istp)
104	!
105	CALL iom_init( cxios_context ) ! iom_put initialization (must be done after nemo_init for AGRIF+XIOS+OASIS)
106	!
107	DO WHILE ( istp <= nitend .AND. nstop == 0 ) ! time stepping
108	!
109	IF( istp /= nit000 ) CALL day ( istp ) ! Calendar (day was already called at nit000 in day_init)
110	CALL iom_setkt ( istp - nit000 + 1, "nemo" ) ! say to iom that we are at time step kstp
111	CALL dta_dyn ( istp ) ! Interpolation of the dynamical fields
112	IF( .NOT.ln_linssh ) CALL dta_dyn_swp( istp ) ! swap of sea surface height and vertical scale factors
113
114	CALL trc_stp ( istp ) ! time-stepping
115	CALL stp_ctl ( istp, indic ) ! Time loop: control and print
116	istp = istp + 1
117	IF( lk_mpp ) CALL mpp_max( nstop )
118	END DO
119	#if defined key_iomput
120	CALL iom_context_finalize( cxios_context ) ! needed for XIOS+AGRIF
121	#endif
122
123	! !------------------------!
124	! !== finalize the run ==!
125	! !------------------------!
126	IF(lwp) WRITE(numout,cform_aaa) ! Flag AAAAAAA
127
128	IF( nstop /= 0 .AND. lwp ) THEN ! error print
129	WRITE(numout,cform_err)
130	WRITE(numout,*) nstop, ' error have been found'
131	ENDIF
132	!
133	IF( nn_timing == 1 ) CALL timing_finalize
134	!
135	CALL nemo_closefile
136	!
137	# if defined key_iomput
138	CALL xios_finalize ! end mpp communications
139	# else
140	IF( lk_mpp ) CALL mppstop ! end mpp communications
141	# endif
142	!
143	END SUBROUTINE nemo_gcm
144
145
146	SUBROUTINE nemo_init
147	!!----------------------------------------------------------------------
148	!! * ROUTINE nemo_init *
149	!!
150	!! ** Purpose : initialization of the nemo model in off-line mode
151	!!----------------------------------------------------------------------
152	INTEGER :: ji ! dummy loop indices
153	INTEGER :: ilocal_comm ! local integer
154	INTEGER :: ios, inum
155	REAL(wp) :: ziglo, zjglo, zkglo, zperio ! local scalars
156	CHARACTER(len=120), DIMENSION(30) :: cltxt, cltxt2, clnam
157	!!
158	NAMELIST/namctl/ ln_ctl , nn_print, nn_ictls, nn_ictle, &
159	& nn_isplt, nn_jsplt, nn_jctls, nn_jctle, &
160	& nn_timing, nn_diacfl
161
162	NAMELIST/namcfg/ ln_read_cfg, cn_domcfg, ln_write_cfg, cn_domcfg_out, ln_use_jattr
163	!!----------------------------------------------------------------------
164	cltxt = ''
165	cltxt2 = ''
166	clnam = ''
167	cxios_context = 'nemo'
168	!
169	! ! Open reference namelist and configuration namelist files
170	CALL ctl_opn( numnam_ref, 'namelist_ref', 'OLD', 'FORMATTED', 'SEQUENTIAL', -1, 6, .FALSE. )
171	CALL ctl_opn( numnam_cfg, 'namelist_cfg', 'OLD', 'FORMATTED', 'SEQUENTIAL', -1, 6, .FALSE. )
172	!
173	REWIND( numnam_ref ) ! Namelist namctl in reference namelist : Control prints & Benchmark
174	READ ( numnam_ref, namctl, IOSTAT = ios, ERR = 901 )
175	901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namctl in reference namelist', .TRUE. )
176
177	REWIND( numnam_cfg ) ! Namelist namctl in confguration namelist : Control prints & Benchmark
178	READ ( numnam_cfg, namctl, IOSTAT = ios, ERR = 902 )
179	902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namctl in configuration namelist', .TRUE. )
180
181	!
182	REWIND( numnam_ref ) ! Namelist namcfg in reference namelist : Control prints & Benchmark
183	READ ( numnam_ref, namcfg, IOSTAT = ios, ERR = 903 )
184	903 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namcfg in reference namelist', .TRUE. )
185
186	REWIND( numnam_cfg ) ! Namelist namcfg in confguration namelist : Control prints & Benchmark
187	READ ( numnam_cfg, namcfg, IOSTAT = ios, ERR = 904 )
188	904 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namcfg in configuration namelist', .TRUE. )
189
190
191	! !--------------------------!
192	! ! Set global domain size ! (control print return in cltxt2)
193	!
194	IF( ln_read_cfg ) THEN ! Read sizes in domain configuration file
195	CALL domain_cfg ( cltxt2, cn_cfg, nn_cfg, jpiglo, jpjglo, jpkglo, jperio )
196	!
197	ELSE ! user-defined namelist
198	CALL usr_def_nam( cltxt2, clnam, cn_cfg, nn_cfg, jpiglo, jpjglo, jpkglo, jperio )
199	ENDIF
200	jpk = jpkglo
201	!
202	!
203	l_offline = .true. ! passive tracers are run offline
204	!
205	! !--------------------------------------------!
206	! ! set communicator & select the local node !
207	! ! NB: mynode also opens output.namelist.dyn !
208	! ! on unit number numond on first proc !
209	! !--------------------------------------------!
210	#if defined key_iomput
211	CALL xios_initialize( "for_xios_mpi_id",return_comm=ilocal_comm )
212	narea = mynode( cltxt, 'output.namelist.dyn', numnam_ref, numnam_cfg, numond , nstop, ilocal_comm ) ! Nodes selection
213	#else
214	ilocal_comm = 0
215	narea = mynode( cltxt, 'output.namelist.dyn', numnam_ref, numnam_cfg, numond , nstop ) ! Nodes selection (control print return in cltxt)
216	#endif
217
218	narea = narea + 1 ! mynode return the rank of proc (0 --> jpnij -1 )
219
220	lwm = (narea == 1) ! control of output namelists
221	lwp = (narea == 1) .OR. ln_ctl ! control of all listing output print
222
223	IF(lwm) THEN
224	! write merged namelists from earlier to output namelist now that the
225	! file has been opened in call to mynode. nammpp has already been
226	! written in mynode (if lk_mpp_mpi)
227	WRITE( numond, namctl )
228	WRITE( numond, namcfg )
229	IF( .NOT.ln_read_cfg ) THEN
230	DO ji = 1, SIZE(clnam)
231	IF( TRIM(clnam (ji)) /= '' ) WRITE(numond, * ) clnam(ji) ! namusr_def print
232	END DO
233	ENDIF
234	ENDIF
235
236	! If dimensions of processor grid weren't specified in the namelist file
237	! then we calculate them here now that we have our communicator size
238	IF( (jpni < 1) .OR. (jpnj < 1) )THEN
239	#if defined key_mpp_mpi
240	CALL nemo_partition(mppsize)
241	#else
242	jpni = 1
243	jpnj = 1
244	jpnij = jpni*jpnj
245	#endif
246	END IF
247
248	! Calculate domain dimensions given calculated jpni and jpnj
249	! This used to be done in par_oce.F90 when they were parameters rather
250	! than variables
251	jpi = ( jpiglo-2jpreci + (jpni-1) ) / jpni + 2jpreci ! first dim.
252	jpj = ( jpjglo-2jprecj + (jpnj-1) ) / jpnj + 2jprecj ! second dim.
253	jpim1 = jpi-1 ! inner domain indices
254	jpjm1 = jpj-1 ! " "
255	jpkm1 = jpk-1 ! " "
256	jpij = jpi*jpj ! jpi x j
257
258
259	IF(lwp) THEN ! open listing units
260	!
261	CALL ctl_opn( numout, 'ocean.output', 'REPLACE', 'FORMATTED', 'SEQUENTIAL', -1, 6, .FALSE., narea )
262	!
263	WRITE(numout,*)
264	WRITE(numout,*) ' CNRS - NERC - Met OFFICE - MERCATOR-ocean - INGV - CMCC'
265	WRITE(numout,*) ' NEMO team'
266	WRITE(numout,*) ' Ocean General Circulation Model'
267	WRITE(numout,*) ' version 3.6 (2015) '
268	WRITE(numout,*)
269	WRITE(numout,*)
270	DO ji = 1, SIZE(cltxt)
271	IF( TRIM(cltxt(ji)) /= '' ) WRITE(numout,*) cltxt(ji) ! control print of mynode
272	END DO
273	WRITE(numout,cform_aaa) ! Flag AAAAAAA
274	!
275	ENDIF
276
277	! Now we know the dimensions of the grid and numout has been set we can
278	! allocate arrays
279	CALL nemo_alloc()
280
281	! !--------------------------------!
282	! ! Model general initialization !
283	! !--------------------------------!
284
285	CALL nemo_ctl ! Control prints & Benchmark
286
287	! ! Domain decomposition
288	CALL mpp_init
289	!
290	IF( nn_timing == 1 ) CALL timing_init
291	!
292
293	! ! General initialization
294	IF( nn_timing == 1 ) CALL timing_start( 'nemo_init')
295	!
296	CALL phy_cst ! Physical constants
297	CALL eos_init ! Equation of state
298	IF( lk_c1d ) CALL c1d_init ! 1D column configuration
299
300	CALL dom_init ! Domain
301
302	CALL istate_init ! ocean initial state (Dynamics and tracers)
303
304	IF( ln_nnogather ) CALL nemo_northcomms ! Initialise the northfold neighbour lists (must be done after the masks are defined)
305
306	IF( ln_ctl ) CALL prt_ctl_init ! Print control
307
308	CALL sbc_init ! Forcings : surface module
309
310	CALL ldf_tra_init ! Lateral ocean tracer physics
311	CALL ldf_eiv_init ! Eddy induced velocity param
312	CALL tra_ldf_init ! lateral mixing
313	IF( l_ldfslp ) CALL ldf_slp_init ! slope of lateral mixing
314
315	CALL tra_qsr_init ! penetrative solar radiation qsr
316	IF( lk_trabbl ) CALL tra_bbl_init ! advective (and/or diffusive) bottom boundary layer scheme
317
318	CALL trc_nam_run ! Needed to get restart parameters for passive tracers
319	CALL trc_rst_cal( nit000, 'READ' ) ! calendar
320	CALL dta_dyn_init ! Initialization for the dynamics
321
322	CALL trc_init ! Passive tracers initialization
323	CALL dia_ptr_init ! Initialise diaptr as some variables are used
324	! ! in various advection and diffusion routines
325	IF(lwp) WRITE(numout,cform_aaa) ! Flag AAAAAAA
326	!
327	IF( nn_timing == 1 ) CALL timing_stop( 'nemo_init')
328	!
329	END SUBROUTINE nemo_init
330
331
332	SUBROUTINE nemo_ctl
333	!!----------------------------------------------------------------------
334	!! * ROUTINE nemo_ctl *
335	!!
336	!! ** Purpose : control print setting
337	!!
338	!! ** Method : - print namctl information and check some consistencies
339	!!----------------------------------------------------------------------
340	!
341	IF(lwp) THEN ! control print
342	WRITE(numout,*)
343	WRITE(numout,*) 'nemo_ctl: Control prints'
344	WRITE(numout,*) '~~~~~~~ '
345	WRITE(numout,*) ' Namelist namctl'
346	WRITE(numout,*) ' run control (for debugging) ln_ctl = ', ln_ctl
347	WRITE(numout,*) ' level of print nn_print = ', nn_print
348	WRITE(numout,*) ' Start i indice for SUM control nn_ictls = ', nn_ictls
349	WRITE(numout,*) ' End i indice for SUM control nn_ictle = ', nn_ictle
350	WRITE(numout,*) ' Start j indice for SUM control nn_jctls = ', nn_jctls
351	WRITE(numout,*) ' End j indice for SUM control nn_jctle = ', nn_jctle
352	WRITE(numout,*) ' number of proc. following i nn_isplt = ', nn_isplt
353	WRITE(numout,*) ' number of proc. following j nn_jsplt = ', nn_jsplt
354	WRITE(numout,*) ' timing activated (0/1) nn_timing = ', nn_timing
355	ENDIF
356	!
357	nprint = nn_print ! convert DOCTOR namelist names into OLD names
358	nictls = nn_ictls
359	nictle = nn_ictle
360	njctls = nn_jctls
361	njctle = nn_jctle
362	isplt = nn_isplt
363	jsplt = nn_jsplt
364
365
366	IF(lwp) THEN ! control print
367	WRITE(numout,*)
368	WRITE(numout,*) 'namcfg : configuration initialization through namelist read'
369	WRITE(numout,*) '~~~~~~~ '
370	WRITE(numout,*) ' Namelist namcfg'
371	WRITE(numout,*) ' read domain configuration files ln_read_cfg = ', ln_read_cfg
372	WRITE(numout,*) ' filename to be read cn_domcfg = ', TRIM(cn_domcfg)
373	WRITE(numout,*) ' write configuration definition files ln_write_cfg = ', ln_write_cfg
374	WRITE(numout,*) ' filename to be written cn_domcfg_out = ', TRIM(cn_domcfg_out)
375	WRITE(numout,*) ' use file attribute if exists as i/p j-start ln_use_jattr = ', ln_use_jattr
376	ENDIF
377
378	! ! Parameter control
379	!
380	IF( ln_ctl ) THEN ! sub-domain area indices for the control prints
381	IF( lk_mpp .AND. jpnij > 1 ) THEN
382	isplt = jpni ; jsplt = jpnj ; ijsplt = jpni*jpnj ! the domain is forced to the real split domain
383	ELSE
384	IF( isplt == 1 .AND. jsplt == 1 ) THEN
385	CALL ctl_warn( ' - isplt & jsplt are equal to 1', &
386	& ' - the print control will be done over the whole domain' )
387	ENDIF
388	ijsplt = isplt * jsplt ! total number of processors ijsplt
389	ENDIF
390	IF(lwp) WRITE(numout,*)' - The total number of processors over which the'
391	IF(lwp) WRITE(numout,*)' print control will be done is ijsplt : ', ijsplt
392	!
393	! ! indices used for the SUM control
394	IF( nictls+nictle+njctls+njctle == 0 ) THEN ! print control done over the default area
395	lsp_area = .FALSE.
396	ELSE ! print control done over a specific area
397	lsp_area = .TRUE.
398	IF( nictls < 1 .OR. nictls > jpiglo ) THEN
399	CALL ctl_warn( ' - nictls must be 1<=nictls>=jpiglo, it is forced to 1' )
400	nictls = 1
401	ENDIF
402	IF( nictle < 1 .OR. nictle > jpiglo ) THEN
403	CALL ctl_warn( ' - nictle must be 1<=nictle>=jpiglo, it is forced to jpiglo' )
404	nictle = jpiglo
405	ENDIF
406	IF( njctls < 1 .OR. njctls > jpjglo ) THEN
407	CALL ctl_warn( ' - njctls must be 1<=njctls>=jpjglo, it is forced to 1' )
408	njctls = 1
409	ENDIF
410	IF( njctle < 1 .OR. njctle > jpjglo ) THEN
411	CALL ctl_warn( ' - njctle must be 1<=njctle>=jpjglo, it is forced to jpjglo' )
412	njctle = jpjglo
413	ENDIF
414	ENDIF
415	ENDIF
416	!
417	IF( 1_wp /= SIGN(1._wp,-0._wp) ) CALL ctl_stop( 'nemo_ctl: The intrinsec SIGN function follows ', &
418	& 'f2003 standard. ' , &
419	& 'Compile with key_nosignedzero enabled' )
420	!
421	END SUBROUTINE nemo_ctl
422
423
424	SUBROUTINE nemo_closefile
425	!!----------------------------------------------------------------------
426	!! * ROUTINE nemo_closefile *
427	!!
428	!! ** Purpose : Close the files
429	!!----------------------------------------------------------------------
430	!
431	IF ( lk_mpp ) CALL mppsync
432	!
433	CALL iom_close ! close all input/output files managed by iom_*
434	!
435	IF( numstp /= -1 ) CLOSE( numstp ) ! time-step file
436	IF( numnam_ref /= -1 ) CLOSE( numnam_ref ) ! oce reference namelist
437	IF( numnam_cfg /= -1 ) CLOSE( numnam_cfg ) ! oce configuration namelist
438	IF( numout /= 6 ) CLOSE( numout ) ! standard model output file
439	IF( lwm.AND.numond /= -1 ) CLOSE( numond ) ! oce output namelist
440
441	numout = 6 ! redefine numout in case it is used after this point...
442	!
443	END SUBROUTINE nemo_closefile
444
445
446	SUBROUTINE nemo_alloc
447	!!----------------------------------------------------------------------
448	!! * ROUTINE nemo_alloc *
449	!!
450	!! ** Purpose : Allocate all the dynamic arrays of the OPA modules
451	!!
452	!! ** Method :
453	!!----------------------------------------------------------------------
454	USE diawri, ONLY: dia_wri_alloc
455	USE dom_oce, ONLY: dom_oce_alloc
456	USE zdf_oce, ONLY: zdf_oce_alloc
457	USE trc_oce, ONLY: trc_oce_alloc
458	!
459	INTEGER :: ierr
460	!!----------------------------------------------------------------------
461	!
462	ierr = oce_alloc () ! ocean
463	ierr = ierr + dia_wri_alloc ()
464	ierr = ierr + dom_oce_alloc () ! ocean domain
465	ierr = ierr + zdf_oce_alloc () ! ocean vertical physics
466	!
467	ierr = ierr + trc_oce_alloc () ! shared TRC / TRA arrays
468	!
469	IF( lk_mpp ) CALL mpp_sum( ierr )
470	IF( ierr /= 0 ) CALL ctl_stop( 'STOP', 'nemo_alloc: unable to allocate standard ocean arrays' )
471	!
472	END SUBROUTINE nemo_alloc
473
474
475	SUBROUTINE nemo_partition( num_pes )
476	!!----------------------------------------------------------------------
477	!! * ROUTINE nemo_partition *
478	!!
479	!! ** Purpose :
480	!!
481	!! ** Method :
482	!!----------------------------------------------------------------------
483	INTEGER, INTENT(in) :: num_pes ! The number of MPI processes we have
484	!
485	INTEGER, PARAMETER :: nfactmax = 20
486	INTEGER :: nfact ! The no. of factors returned
487	INTEGER :: ierr ! Error flag
488	INTEGER :: ji
489	INTEGER :: idiff, mindiff, imin ! For choosing pair of factors that are closest in value
490	INTEGER, DIMENSION(nfactmax) :: ifact ! Array of factors
491	!!----------------------------------------------------------------------
492
493	ierr = 0
494
495	CALL factorise( ifact, nfactmax, nfact, num_pes, ierr )
496
497	IF( nfact <= 1 ) THEN
498	WRITE (numout, *) 'WARNING: factorisation of number of PEs failed'
499	WRITE (numout, *) ' : using grid of ',num_pes,' x 1'
500	jpnj = 1
501	jpni = num_pes
502	ELSE
503	! Search through factors for the pair that are closest in value
504	mindiff = 1000000
505	imin = 1
506	DO ji = 1, nfact-1, 2
507	idiff = ABS( ifact(ji) - ifact(ji+1) )
508	IF( idiff < mindiff ) THEN
509	mindiff = idiff
510	imin = ji
511	ENDIF
512	END DO
513	jpnj = ifact(imin)
514	jpni = ifact(imin + 1)
515	ENDIF
516	!
517	jpnij = jpni*jpnj
518	!
519	END SUBROUTINE nemo_partition
520
521
522	SUBROUTINE factorise( kfax, kmaxfax, knfax, kn, kerr )
523	!!----------------------------------------------------------------------
524	!! * ROUTINE factorise *
525	!!
526	!! ** Purpose : return the prime factors of n.
527	!! knfax factors are returned in array kfax which is of
528	!! maximum dimension kmaxfax.
529	!! ** Method :
530	!!----------------------------------------------------------------------
531	INTEGER , INTENT(in ) :: kn, kmaxfax
532	INTEGER , INTENT( out) :: kerr, knfax
533	INTEGER, DIMENSION(kmaxfax), INTENT( out) :: kfax
534	!
535	INTEGER :: ifac, jl, inu
536	INTEGER, PARAMETER :: ntest = 14
537	INTEGER :: ilfax(ntest)
538	!
539	! lfax contains the set of allowed factors.
540	ilfax(:) = (/(2**jl,jl=ntest,1,-1)/)
541
542	! Clear the error flag and initialise output vars
543	kerr = 0
544	kfax = 1
545	knfax = 0
546
547	! Find the factors of n.
548	IF( kn == 1 ) GOTO 20
549
550	! nu holds the unfactorised part of the number.
551	! knfax holds the number of factors found.
552	! l points to the allowed factor list.
553	! ifac holds the current factor.
554
555	inu = kn
556	knfax = 0
557
558	DO jl = ntest, 1, -1
559	!
560	ifac = ilfax(jl)
561	IF( ifac > inu ) CYCLE
562
563	! Test whether the factor will divide.
564
565	IF( MOD(inu,ifac) == 0 ) THEN
566	!
567	knfax = knfax + 1 ! Add the factor to the list
568	IF( knfax > kmaxfax ) THEN
569	kerr = 6
570	write (,) 'FACTOR: insufficient space in factor array ', knfax
571	return
572	ENDIF
573	kfax(knfax) = ifac
574	! Store the other factor that goes with this one
575	knfax = knfax + 1
576	kfax(knfax) = inu / ifac
577	!WRITE (,) 'ARPDBG, factors ',knfax-1,' & ',knfax,' are ', kfax(knfax-1),' and ',kfax(knfax)
578	ENDIF
579	!
580	END DO
581
582	20 CONTINUE ! Label 20 is the exit point from the factor search loop.
583	!
584	END SUBROUTINE factorise
585
586	#if defined key_mpp_mpi
587	SUBROUTINE nemo_northcomms
588	!!======================================================================
589	!! * ROUTINE nemo_northcomms *
590	!! nemo_northcomms : Setup for north fold exchanges with explicit
591	!! point-to-point messaging
592	!!=====================================================================
593	!!----------------------------------------------------------------------
594	!!
595	!! ** Purpose : Initialization of the northern neighbours lists.
596	!!----------------------------------------------------------------------
597	!! 1.0 ! 2011-10 (A. C. Coward, NOCS & J. Donners, PRACE)
598	!! 2.0 ! 2013-06 Setup avoiding MPI communication (I. Epicoco, S.
599	!Mocavero, CMCC)
600	!!----------------------------------------------------------------------
601
602	INTEGER :: sxM, dxM, sxT, dxT, jn
603	INTEGER :: njmppmax
604
605	njmppmax = MAXVAL( njmppt )
606
607	!initializes the north-fold communication variables
608	isendto(:) = 0
609	nsndto = 0
610
611	!if I am a process in the north
612	IF ( njmpp == njmppmax ) THEN
613	!sxM is the first point (in the global domain) needed to compute the
614	!north-fold for the current process
615	sxM = jpiglo - nimppt(narea) - nlcit(narea) + 1
616	!dxM is the last point (in the global domain) needed to compute the
617	!north-fold for the current process
618	dxM = jpiglo - nimppt(narea) + 2
619
620	!loop over the other north-fold processes to find the processes
621	!managing the points belonging to the sxT-dxT range
622
623	DO jn = 1, jpni
624	!sxT is the first point (in the global domain) of the jn
625	!process
626	sxT = nfiimpp(jn, jpnj)
627	!dxT is the last point (in the global domain) of the jn
628	!process
629	dxT = nfiimpp(jn, jpnj) + nfilcit(jn, jpnj) - 1
630	IF ((sxM .gt. sxT) .AND. (sxM .lt. dxT)) THEN
631	nsndto = nsndto + 1
632	isendto(nsndto) = jn
633	ELSEIF ((sxM .le. sxT) .AND. (dxM .ge. dxT)) THEN
634	nsndto = nsndto + 1
635	isendto(nsndto) = jn
636	ELSEIF ((dxM .lt. dxT) .AND. (sxT .lt. dxM)) THEN
637	nsndto = nsndto + 1
638	isendto(nsndto) = jn
639	END IF
640	END DO
641	nfsloop = 1
642	nfeloop = nlci
643	DO jn = 2,jpni-1
644	IF(nfipproc(jn,jpnj) .eq. (narea - 1)) THEN
645	IF (nfipproc(jn - 1 ,jpnj) .eq. -1) THEN
646	nfsloop = nldi
647	ENDIF
648	IF (nfipproc(jn + 1,jpnj) .eq. -1) THEN
649	nfeloop = nlei
650	ENDIF
651	ENDIF
652	END DO
653
654	ENDIF
655	l_north_nogather = .TRUE.
656	END SUBROUTINE nemo_northcomms
657	#else
658	SUBROUTINE nemo_northcomms ! Dummy routine
659	WRITE(,) 'nemo_northcomms: You should not have seen this print! error?'
660	END SUBROUTINE nemo_northcomms
661	#endif
662
663	SUBROUTINE istate_init
664	!!----------------------------------------------------------------------
665	!! * ROUTINE istate_init *
666	!!
667	!! ** Purpose : Initialization to zero of the dynamics and tracers.
668	!!----------------------------------------------------------------------
669	!
670	! now fields ! after fields !
671	un (:,:,:) = 0._wp ; ua(:,:,:) = 0._wp !
672	vn (:,:,:) = 0._wp ; va(:,:,:) = 0._wp !
673	wn (:,:,:) = 0._wp ! !
674	hdivn(:,:,:) = 0._wp ! !
675	tsn (:,:,:,:) = 0._wp ! !
676	!
677	rhd (:,:,:) = 0.e0
678	rhop (:,:,:) = 0.e0
679	rn2 (:,:,:) = 0.e0
680	!
681	END SUBROUTINE istate_init
682
683	SUBROUTINE stp_ctl( kt, kindic )
684	!!----------------------------------------------------------------------
685	!! * ROUTINE stp_ctl *
686	!!
687	!! ** Purpose : Control the run
688	!!
689	!! ** Method : - Save the time step in numstp
690	!!
691	!! ** Actions : 'time.step' file containing the last ocean time-step
692	!!----------------------------------------------------------------------
693	INTEGER, INTENT(in ) :: kt ! ocean time-step index
694	INTEGER, INTENT(inout) :: kindic ! indicator of solver convergence
695	!!----------------------------------------------------------------------
696	!
697	IF( kt == nit000 .AND. lwp ) THEN
698	WRITE(numout,*)
699	WRITE(numout,*) 'stp_ctl : time-stepping control'
700	WRITE(numout,*) '~~~~~~~'
701	! open time.step file
702	CALL ctl_opn( numstp, 'time.step', 'REPLACE', 'FORMATTED', 'SEQUENTIAL', -1, numout, lwp, narea )
703	ENDIF
704	!
705	IF(lwp) WRITE ( numstp, '(1x, i8)' ) kt !* save the current time step in numstp
706	IF(lwp) REWIND( numstp ) ! --------------------------
707	!
708	END SUBROUTINE stp_ctl
709	!!======================================================================
710	END MODULE nemogcm

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