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nemogcm.F90 in branches/2013/dev_LOCEAN_CMCC_INGV_MERC_UKMO_2013/NEMOGCM/NEMO/SAS_SRC – NEMO

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source: branches/2013/dev_LOCEAN_CMCC_INGV_MERC_UKMO_2013/NEMOGCM/NEMO/SAS_SRC/nemogcm.F90 @ 4244

Last change on this file since 4244 was 4232, checked in by cetlod, 10 years ago
dev_LOCEAN_CMCC_INGV_2013 : minor bug corrections, see ticket #1182
File size: 28.5 KB

Line
1	MODULE nemogcm
2	!!======================================================================
3	!! * MODULE nemogcm *
4	!! Ocean system : NEMO GCM (ocean dynamics, on-line tracers, biochemistry and sea-ice)
5	!!======================================================================
6	!! History : OPA ! 1990-10 (C. Levy, G. Madec) Original code
7	!! 7.0 ! 1991-11 (M. Imbard, C. Levy, G. Madec)
8	!! 7.1 ! 1993-03 (M. Imbard, C. Levy, G. Madec, O. Marti, M. Guyon, A. Lazar,
9	!! P. Delecluse, C. Perigaud, G. Caniaux, B. Colot, C. Maes) release 7.1
10	!! - ! 1992-06 (L.Terray) coupling implementation
11	!! - ! 1993-11 (M.A. Filiberti) IGLOO sea-ice
12	!! 8.0 ! 1996-03 (M. Imbard, C. Levy, G. Madec, O. Marti, M. Guyon, A. Lazar,
13	!! P. Delecluse, L.Terray, M.A. Filiberti, J. Vialar, A.M. Treguier, M. Levy) release 8.0
14	!! 8.1 ! 1997-06 (M. Imbard, G. Madec)
15	!! 8.2 ! 1999-11 (M. Imbard, H. Goosse) LIM sea-ice model
16	!! ! 1999-12 (V. Thierry, A-M. Treguier, M. Imbard, M-A. Foujols) OPEN-MP
17	!! ! 2000-07 (J-M Molines, M. Imbard) Open Boundary Conditions (CLIPPER)
18	!! NEMO 1.0 ! 2002-08 (G. Madec) F90: Free form and modules
19	!! - ! 2004-06 (R. Redler, NEC CCRLE, Germany) add OASIS[3/4] coupled interfaces
20	!! - ! 2004-08 (C. Talandier) New trends organization
21	!! - ! 2005-06 (C. Ethe) Add the 1D configuration possibility
22	!! - ! 2005-11 (V. Garnier) Surface pressure gradient organization
23	!! - ! 2006-03 (L. Debreu, C. Mazauric) Agrif implementation
24	!! - ! 2006-04 (G. Madec, R. Benshila) Step reorganization
25	!! - ! 2007-07 (J. Chanut, A. Sellar) Unstructured open boundaries (BDY)
26	!! 3.2 ! 2009-08 (S. Masson) open/write in the listing file in mpp
27	!! 3.3 ! 2010-05 (K. Mogensen, A. Weaver, M. Martin, D. Lea) Assimilation interface
28	!! - ! 2010-10 (C. Ethe, G. Madec) reorganisation of initialisation phase
29	!! 3.3.1! 2011-01 (A. R. Porter, STFC Daresbury) dynamical allocation
30	!! 3.4 ! 2011-11 (C. Harris) decomposition changes for running with CICE
31	!!----------------------------------------------------------------------
32
33	!!----------------------------------------------------------------------
34	!! nemo_gcm : solve ocean dynamics, tracer, biogeochemistry and/or sea-ice
35	!! nemo_init : initialization of the NEMO system
36	!! nemo_ctl : initialisation of the contol print
37	!! nemo_closefile : close remaining open files
38	!! nemo_alloc : dynamical allocation
39	!! nemo_partition : calculate MPP domain decomposition
40	!! factorise : calculate the factors of the no. of MPI processes
41	!!----------------------------------------------------------------------
42	USE step_oce ! module used in the ocean time stepping module
43	USE sbc_oce ! surface boundary condition: ocean
44	USE cla ! cross land advection (tra_cla routine)
45	USE domcfg ! domain configuration (dom_cfg routine)
46	USE daymod ! calendar
47	USE mppini ! shared/distributed memory setting (mpp_init routine)
48	USE domain ! domain initialization (dom_init routine)
49	USE phycst ! physical constant (par_cst routine)
50	USE step ! NEMO time-stepping (stp routine)
51	USE lib_mpp ! distributed memory computing
52	#if defined key_iomput
53	USE xios
54	#endif
55	USE sbcssm
56	USE lbcnfd, ONLY: isendto, nsndto ! Setup of north fold exchanges
57
58	IMPLICIT NONE
59	PRIVATE
60
61	PUBLIC nemo_gcm ! called by model.F90
62	PUBLIC nemo_init ! needed by AGRIF
63
64	CHARACTER(lc) :: cform_aaa="( /, 'AAAAAAAA', / ) " ! flag for output listing
65
66	!!----------------------------------------------------------------------
67	!! NEMO/OPA 4.0 , NEMO Consortium (2011)
68	!! $Id: nemogcm.F90 3294 2012-01-28 16:44:18Z rblod $
69	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
70	!!----------------------------------------------------------------------
71	CONTAINS
72
73	SUBROUTINE nemo_gcm
74	!!----------------------------------------------------------------------
75	!! * ROUTINE nemo_gcm *
76	!!
77	!! ** Purpose : NEMO solves the primitive equations on an orthogonal
78	!! curvilinear mesh on the sphere.
79	!!
80	!! ** Method : - model general initialization
81	!! - launch the time-stepping (stp routine)
82	!! - finalize the run by closing files and communications
83	!!
84	!! References : Madec, Delecluse, Imbard, and Levy, 1997: internal report, IPSL.
85	!! Madec, 2008, internal report, IPSL.
86	!!----------------------------------------------------------------------
87	INTEGER :: istp ! time step index
88	!!----------------------------------------------------------------------
89	!
90	#if defined key_agrif
91	CALL Agrif_Init_Grids() ! AGRIF: set the meshes
92	#endif
93
94	! !-----------------------!
95	CALL nemo_init !== Initialisations ==!
96	! !-----------------------!
97	#if defined key_agrif
98	CALL Agrif_Declare_Var ! AGRIF: set the meshes
99	#endif
100	! check that all process are still there... If some process have an error,
101	! they will never enter in step and other processes will wait until the end of the cpu time!
102	IF( lk_mpp ) CALL mpp_max( nstop )
103
104	IF(lwp) WRITE(numout,cform_aaa) ! Flag AAAAAAA
105
106	! !-----------------------!
107	! !== time stepping ==!
108	! !-----------------------!
109	istp = nit000
110
111	DO WHILE ( istp <= nitend .AND. nstop == 0 )
112	#if defined key_agrif
113	CALL Agrif_Step( stp ) ! AGRIF: time stepping
114	#else
115	CALL stp( istp ) ! standard time stepping
116	#endif
117	istp = istp + 1
118	IF( lk_mpp ) CALL mpp_max( nstop )
119	END DO
120	! !------------------------!
121	! !== finalize the run ==!
122	! !------------------------!
123	IF(lwp) WRITE(numout,cform_aaa) ! Flag AAAAAAA
124	!
125	IF( nstop /= 0 .AND. lwp ) THEN ! error print
126	WRITE(numout,cform_err)
127	WRITE(numout,*) nstop, ' error have been found'
128	ENDIF
129	!
130	#if defined key_agrif
131	CALL Agrif_ParentGrid_To_ChildGrid()
132	IF( nn_timing == 1 ) CALL timing_finalize
133	CALL Agrif_ChildGrid_To_ParentGrid()
134	#endif
135	IF( nn_timing == 1 ) CALL timing_finalize
136	!
137	CALL nemo_closefile
138	#if defined key_iomput
139	CALL xios_finalize ! end mpp communications with xios
140	#else
141	IF( lk_mpp ) CALL mppstop ! end mpp communications
142	#endif
143	!
144	END SUBROUTINE nemo_gcm
145
146
147	SUBROUTINE nemo_init
148	!!----------------------------------------------------------------------
149	!! * ROUTINE nemo_init *
150	!!
151	!! ** Purpose : initialization of the NEMO GCM
152	!!----------------------------------------------------------------------
153	INTEGER :: ji ! dummy loop indices
154	INTEGER :: ilocal_comm ! local integer
155	INTEGER :: ios
156
157	CHARACTER(len=80), DIMENSION(16) :: cltxt
158	!!
159	NAMELIST/namctl/ ln_ctl , nn_print, nn_ictls, nn_ictle, &
160	& nn_isplt, nn_jsplt, nn_jctls, nn_jctle, &
161	& nn_bench, nn_timing
162	NAMELIST/namcfg/ cp_cfg, cp_cfz, jp_cfg, jpidta, jpjdta, jpkdta, jpiglo, jpjglo, &
163	& jpizoom, jpjzoom, jperio
164	!!----------------------------------------------------------------------
165	!
166	cltxt = '' !
167	! ! Open reference namelist and configuration namelist files
168	CALL ctl_opn( numnam_ref, 'namelist_ref', 'OLD', 'FORMATTED', 'SEQUENTIAL', -1, 6, .FALSE. )
169	CALL ctl_opn( numnam_cfg, 'namelist_cfg', 'OLD', 'FORMATTED', 'SEQUENTIAL', -1, 6, .FALSE. )
170	CALL ctl_opn( numond, 'output.namelist.dyn', 'REPLACE', 'FORMATTED', 'SEQUENTIAL', -1, 6, .FALSE. )
171	!
172	REWIND( numnam_ref ) ! Namelist namctl in reference namelist : Control prints & Benchmark
173	READ ( numnam_ref, namctl, IOSTAT = ios, ERR = 901 )
174	901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namctl in reference namelist', lwp )
175
176	REWIND( numnam_cfg ) ! Namelist namctl in confguration namelist : Control prints & Benchmark
177	READ ( numnam_cfg, namctl, IOSTAT = ios, ERR = 902 )
178	902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namctl in configuration namelist', lwp )
179	WRITE( numond, namctl )
180	!
181	REWIND( numnam_ref ) ! Namelist namcfg in reference namelist : Control prints & Benchmark
182	READ ( numnam_ref, namcfg, IOSTAT = ios, ERR = 903 )
183	903 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namcfg in reference namelist', lwp )
184
185	REWIND( numnam_cfg ) ! Namelist namcfg in confguration namelist : Control prints & Benchmark
186	READ ( numnam_cfg, namcfg, IOSTAT = ios, ERR = 904 )
187	904 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namcfg in configuration namelist', lwp )
188	WRITE( numond, namcfg )
189	! !--------------------------------------------!
190	! ! set communicator & select the local node !
191	! !--------------------------------------------!
192	#if defined key_iomput
193	IF( Agrif_Root() ) THEN
194	CALL xios_initialize( "nemo",return_comm=ilocal_comm )
195	ENDIF
196	narea = mynode ( cltxt, numnam_ref, numnam_cfg, numond , nstop, ilocal_comm ) ! Nodes selection
197	#else
198	ilocal_comm = 0
199	narea = mynode( cltxt, numnam_ref, numnam_cfg, numond , nstop, ilocal_comm ) ! Nodes selection (control print return in cltxt)
200	#endif
201	narea = narea + 1 ! mynode return the rank of proc (0 --> jpnij -1 )
202
203	lwp = (narea == 1) .OR. ln_ctl ! control of all listing output print
204
205	! If dimensions of processor grid weren't specified in the namelist file
206	! then we calculate them here now that we have our communicator size
207	IF( (jpni < 1) .OR. (jpnj < 1) )THEN
208	#if defined key_mpp_mpi
209	IF( Agrif_Root() ) CALL nemo_partition(mppsize)
210	#else
211	jpni = 1
212	jpnj = 1
213	jpnij = jpni*jpnj
214	#endif
215	END IF
216
217	! Calculate domain dimensions given calculated jpni and jpnj
218	! This used to be done in par_oce.F90 when they were parameters rather
219	! than variables
220	IF( Agrif_Root() ) THEN
221	jpi = ( jpiglo-2jpreci + (jpni-1) ) / jpni + 2jpreci ! first dim.
222	#if defined key_nemocice_decomp
223	jpj = ( jpjglo+1-2jprecj + (jpnj-1) ) / jpnj + 2jprecj ! second dim.
224	#else
225	jpj = ( jpjglo-2jprecj + (jpnj-1) ) / jpnj + 2jprecj ! second dim.
226	#endif
227	jpk = jpkdta ! third dim
228	jpim1 = jpi-1 ! inner domain indices
229	jpjm1 = jpj-1 ! " "
230	jpkm1 = jpk-1 ! " "
231	jpij = jpi*jpj ! jpi x j
232	ENDIF
233
234	IF(lwp) THEN ! open listing units
235	!
236	CALL ctl_opn( numout, 'ocean.output', 'REPLACE', 'FORMATTED', 'SEQUENTIAL', -1, 6, .FALSE., narea )
237	!
238	WRITE(numout,*)
239	WRITE(numout,*) ' CNRS - NERC - Met OFFICE - MERCATOR-ocean - INGV - CMCC'
240	WRITE(numout,*) ' NEMO team'
241	WRITE(numout,*) ' Ocean General Circulation Model'
242	WRITE(numout,*) ' version 3.4 (2011) '
243	WRITE(numout,*) ' StandAlone Surface version (SAS) '
244	WRITE(numout,*)
245	WRITE(numout,*)
246	DO ji = 1, SIZE(cltxt)
247	IF( TRIM(cltxt(ji)) /= '' ) WRITE(numout,*) cltxt(ji) ! control print of mynode
248	END DO
249	WRITE(numout,cform_aaa) ! Flag AAAAAAA
250	!
251	ENDIF
252
253	! Now we know the dimensions of the grid and numout has been set we can
254	! allocate arrays
255	CALL nemo_alloc()
256
257	! !-------------------------------!
258	! ! NEMO general initialization !
259	! !-------------------------------!
260
261	CALL nemo_ctl ! Control prints & Benchmark
262
263	! ! Domain decomposition
264	IF( jpni*jpnj == jpnij ) THEN ; CALL mpp_init ! standard cutting out
265	ELSE ; CALL mpp_init2 ! eliminate land processors
266	ENDIF
267	!
268	IF( nn_timing == 1 ) CALL timing_init
269	!
270	! ! General initialization
271	CALL phy_cst ! Physical constants
272	CALL eos_init ! Equation of state
273	CALL dom_cfg ! Domain configuration
274	CALL dom_init ! Domain
275
276	IF( ln_nnogather ) CALL nemo_northcomms ! Initialise the northfold neighbour lists (must be done after the masks are defined)
277
278	IF( ln_ctl ) CALL prt_ctl_init ! Print control
279	CALL flush(numout)
280
281	CALL day_init ! model calendar (using both namelist and restart infos)
282
283	CALL sbc_init ! Forcings : surface module
284
285	IF(lwp) WRITE(numout,*) 'Euler time step switch is ', neuler
286	!
287	END SUBROUTINE nemo_init
288
289
290	SUBROUTINE nemo_ctl
291	!!----------------------------------------------------------------------
292	!! * ROUTINE nemo_ctl *
293	!!
294	!! ** Purpose : control print setting
295	!!
296	!! ** Method : - print namctl information and check some consistencies
297	!!----------------------------------------------------------------------
298	!
299	IF(lwp) THEN ! control print
300	WRITE(numout,*)
301	WRITE(numout,*) 'nemo_ctl: Control prints & Benchmark'
302	WRITE(numout,*) '~~~~~~~ '
303	WRITE(numout,*) ' Namelist namctl'
304	WRITE(numout,*) ' run control (for debugging) ln_ctl = ', ln_ctl
305	WRITE(numout,*) ' level of print nn_print = ', nn_print
306	WRITE(numout,*) ' Start i indice for SUM control nn_ictls = ', nn_ictls
307	WRITE(numout,*) ' End i indice for SUM control nn_ictle = ', nn_ictle
308	WRITE(numout,*) ' Start j indice for SUM control nn_jctls = ', nn_jctls
309	WRITE(numout,*) ' End j indice for SUM control nn_jctle = ', nn_jctle
310	WRITE(numout,*) ' number of proc. following i nn_isplt = ', nn_isplt
311	WRITE(numout,*) ' number of proc. following j nn_jsplt = ', nn_jsplt
312	WRITE(numout,*) ' benchmark parameter (0/1) nn_bench = ', nn_bench
313	ENDIF
314	!
315	nprint = nn_print ! convert DOCTOR namelist names into OLD names
316	nictls = nn_ictls
317	nictle = nn_ictle
318	njctls = nn_jctls
319	njctle = nn_jctle
320	isplt = nn_isplt
321	jsplt = nn_jsplt
322	nbench = nn_bench
323
324	IF(lwp) THEN ! control print
325	WRITE(numout,*)
326	WRITE(numout,*) 'namcfg : configuration initialization through namelist read'
327	WRITE(numout,*) '~~~~~~~ '
328	WRITE(numout,*) ' Namelist namcfg'
329	WRITE(numout,*) ' configuration name cp_cfg = ', TRIM(cp_cfg)
330	WRITE(numout,*) ' configuration zoom name cp_cfz = ', TRIM(cp_cfz)
331	WRITE(numout,*) ' configuration resolution jp_cfg = ', jp_cfg
332	WRITE(numout,*) ' 1st lateral dimension ( >= jpi ) jpidta = ', jpidta
333	WRITE(numout,*) ' 2nd " " ( >= jpj ) jpjdta = ', jpjdta
334	WRITE(numout,*) ' 3nd " " jpkdta = ', jpkdta
335	WRITE(numout,*) ' 1st dimension of global domain in i jpiglo = ', jpiglo
336	WRITE(numout,*) ' 2nd - - in j jpjglo = ', jpjglo
337	WRITE(numout,*) ' left bottom i index of the zoom (in data domain) jpizoom = ', jpizoom
338	WRITE(numout,*) ' left bottom j index of the zoom (in data domain) jpizoom = ', jpjzoom
339	WRITE(numout,*) ' lateral cond. type (between 0 and 6) jperio = ', jperio
340	ENDIF
341	! ! Parameter control
342	!
343	IF( ln_ctl ) THEN ! sub-domain area indices for the control prints
344	IF( lk_mpp .AND. jpnij > 1 ) THEN
345	isplt = jpni ; jsplt = jpnj ; ijsplt = jpni*jpnj ! the domain is forced to the real split domain
346	ELSE
347	IF( isplt == 1 .AND. jsplt == 1 ) THEN
348	CALL ctl_warn( ' - isplt & jsplt are equal to 1', &
349	& ' - the print control will be done over the whole domain' )
350	ENDIF
351	ijsplt = isplt * jsplt ! total number of processors ijsplt
352	ENDIF
353	IF(lwp) WRITE(numout,*)' - The total number of processors over which the'
354	IF(lwp) WRITE(numout,*)' print control will be done is ijsplt : ', ijsplt
355	!
356	! ! indices used for the SUM control
357	IF( nictls+nictle+njctls+njctle == 0 ) THEN ! print control done over the default area
358	lsp_area = .FALSE.
359	ELSE ! print control done over a specific area
360	lsp_area = .TRUE.
361	IF( nictls < 1 .OR. nictls > jpiglo ) THEN
362	CALL ctl_warn( ' - nictls must be 1<=nictls>=jpiglo, it is forced to 1' )
363	nictls = 1
364	ENDIF
365	IF( nictle < 1 .OR. nictle > jpiglo ) THEN
366	CALL ctl_warn( ' - nictle must be 1<=nictle>=jpiglo, it is forced to jpiglo' )
367	nictle = jpiglo
368	ENDIF
369	IF( njctls < 1 .OR. njctls > jpjglo ) THEN
370	CALL ctl_warn( ' - njctls must be 1<=njctls>=jpjglo, it is forced to 1' )
371	njctls = 1
372	ENDIF
373	IF( njctle < 1 .OR. njctle > jpjglo ) THEN
374	CALL ctl_warn( ' - njctle must be 1<=njctle>=jpjglo, it is forced to jpjglo' )
375	njctle = jpjglo
376	ENDIF
377	ENDIF
378	ENDIF
379	!
380	IF( nbench == 1 ) THEN ! Benchmark
381	SELECT CASE ( cp_cfg )
382	CASE ( 'gyre' ) ; CALL ctl_warn( ' The Benchmark is activated ' )
383	CASE DEFAULT ; CALL ctl_stop( ' The Benchmark is based on the GYRE configuration:', &
384	& ' cp_cfg="gyre" in namelist &namcfg or set nbench = 0' )
385	END SELECT
386	ENDIF
387	!
388	END SUBROUTINE nemo_ctl
389
390
391	SUBROUTINE nemo_closefile
392	!!----------------------------------------------------------------------
393	!! * ROUTINE nemo_closefile *
394	!!
395	!! ** Purpose : Close the files
396	!!----------------------------------------------------------------------
397	!
398	IF( lk_mpp ) CALL mppsync
399	!
400	CALL iom_close ! close all input/output files managed by iom_*
401	!
402	IF( numstp /= -1 ) CLOSE( numstp ) ! time-step file
403	IF( numnam_ref /= -1 ) CLOSE( numnam_ref ) ! oce reference namelist
404	IF( numnam_cfg /= -1 ) CLOSE( numnam_cfg ) ! oce configuration namelist
405	IF( numond /= -1 ) CLOSE( numond ) ! oce output namelist
406	IF( numnam_ice_ref /= -1 ) CLOSE( numnam_ice_ref ) ! ice reference namelist
407	IF( numnam_ice_cfg /= -1 ) CLOSE( numnam_ice_cfg ) ! ice configuration namelist
408	IF( numoni /= -1 ) CLOSE( numoni ) ! ice output namelist
409	IF( numevo_ice /= -1 ) CLOSE( numevo_ice ) ! ice variables (temp. evolution)
410	IF( numout /= 6 ) CLOSE( numout ) ! standard model output file
411	!
412	numout = 6 ! redefine numout in case it is used after this point...
413	!
414	END SUBROUTINE nemo_closefile
415
416
417	SUBROUTINE nemo_alloc
418	!!----------------------------------------------------------------------
419	!! * ROUTINE nemo_alloc *
420	!!
421	!! ** Purpose : Allocate all the dynamic arrays of the OPA modules
422	!!
423	!! ** Method :
424	!!----------------------------------------------------------------------
425	USE diawri , ONLY: dia_wri_alloc
426	USE dom_oce , ONLY: dom_oce_alloc
427	USE oce , ONLY : sshn, sshb, snwice_mass, snwice_mass_b, snwice_fmass
428	!
429	INTEGER :: ierr,ierr4
430	!!----------------------------------------------------------------------
431	!
432	ierr = dia_wri_alloc ()
433	ierr = ierr + dom_oce_alloc () ! ocean domain
434	ALLOCATE( snwice_mass(jpi,jpj) , snwice_mass_b(jpi,jpj), &
435	& snwice_fmass(jpi,jpj), STAT= ierr4 )
436	ierr = ierr + ierr4
437	!
438	IF( lk_mpp ) CALL mpp_sum( ierr )
439	IF( ierr /= 0 ) CALL ctl_stop( 'STOP', 'nemo_alloc : unable to allocate standard ocean arrays' )
440	!
441	END SUBROUTINE nemo_alloc
442
443
444	SUBROUTINE nemo_partition( num_pes )
445	!!----------------------------------------------------------------------
446	!! * ROUTINE nemo_partition *
447	!!
448	!! ** Purpose :
449	!!
450	!! ** Method :
451	!!----------------------------------------------------------------------
452	INTEGER, INTENT(in) :: num_pes ! The number of MPI processes we have
453	!
454	INTEGER, PARAMETER :: nfactmax = 20
455	INTEGER :: nfact ! The no. of factors returned
456	INTEGER :: ierr ! Error flag
457	INTEGER :: ji
458	INTEGER :: idiff, mindiff, imin ! For choosing pair of factors that are closest in value
459	INTEGER, DIMENSION(nfactmax) :: ifact ! Array of factors
460	!!----------------------------------------------------------------------
461
462	ierr = 0
463
464	CALL factorise( ifact, nfactmax, nfact, num_pes, ierr )
465
466	IF( nfact <= 1 ) THEN
467	WRITE (numout, *) 'WARNING: factorisation of number of PEs failed'
468	WRITE (numout, *) ' : using grid of ',num_pes,' x 1'
469	jpnj = 1
470	jpni = num_pes
471	ELSE
472	! Search through factors for the pair that are closest in value
473	mindiff = 1000000
474	imin = 1
475	DO ji = 1, nfact-1, 2
476	idiff = ABS( ifact(ji) - ifact(ji+1) )
477	IF( idiff < mindiff ) THEN
478	mindiff = idiff
479	imin = ji
480	ENDIF
481	END DO
482	jpnj = ifact(imin)
483	jpni = ifact(imin + 1)
484	ENDIF
485	!
486	jpnij = jpni*jpnj
487	!
488	END SUBROUTINE nemo_partition
489
490
491	SUBROUTINE factorise( kfax, kmaxfax, knfax, kn, kerr )
492	!!----------------------------------------------------------------------
493	!! * ROUTINE factorise *
494	!!
495	!! ** Purpose : return the prime factors of n.
496	!! knfax factors are returned in array kfax which is of
497	!! maximum dimension kmaxfax.
498	!! ** Method :
499	!!----------------------------------------------------------------------
500	INTEGER , INTENT(in ) :: kn, kmaxfax
501	INTEGER , INTENT( out) :: kerr, knfax
502	INTEGER, DIMENSION(kmaxfax), INTENT( out) :: kfax
503	!
504	INTEGER :: ifac, jl, inu
505	INTEGER, PARAMETER :: ntest = 14
506	INTEGER :: ilfax(ntest)
507
508	! lfax contains the set of allowed factors.
509	data (ilfax(jl),jl=1,ntest) / 16384, 8192, 4096, 2048, 1024, 512, 256, &
510	& 128, 64, 32, 16, 8, 4, 2 /
511	!!----------------------------------------------------------------------
512
513	! Clear the error flag and initialise output vars
514	kerr = 0
515	kfax = 1
516	knfax = 0
517
518	! Find the factors of n.
519	IF( kn == 1 ) GOTO 20
520
521	! nu holds the unfactorised part of the number.
522	! knfax holds the number of factors found.
523	! l points to the allowed factor list.
524	! ifac holds the current factor.
525
526	inu = kn
527	knfax = 0
528
529	DO jl = ntest, 1, -1
530	!
531	ifac = ilfax(jl)
532	IF( ifac > inu ) CYCLE
533
534	! Test whether the factor will divide.
535
536	IF( MOD(inu,ifac) == 0 ) THEN
537	!
538	knfax = knfax + 1 ! Add the factor to the list
539	IF( knfax > kmaxfax ) THEN
540	kerr = 6
541	write (,) 'FACTOR: insufficient space in factor array ', knfax
542	return
543	ENDIF
544	kfax(knfax) = ifac
545	! Store the other factor that goes with this one
546	knfax = knfax + 1
547	kfax(knfax) = inu / ifac
548	!WRITE (,) 'ARPDBG, factors ',knfax-1,' & ',knfax,' are ', kfax(knfax-1),' and ',kfax(knfax)
549	ENDIF
550	!
551	END DO
552
553	20 CONTINUE ! Label 20 is the exit point from the factor search loop.
554	!
555	END SUBROUTINE factorise
556
557	#if defined key_mpp_mpi
558	SUBROUTINE nemo_northcomms
559	!!======================================================================
560	!! * ROUTINE nemo_northcomms *
561	!! nemo_northcomms : Setup for north fold exchanges with explicit
562	!! point-to-point messaging
563	!!=====================================================================
564	!!----------------------------------------------------------------------
565	!!
566	!! ** Purpose : Initialization of the northern neighbours lists.
567	!!----------------------------------------------------------------------
568	!! 1.0 ! 2011-10 (A. C. Coward, NOCS & J. Donners, PRACE)
569	!! 2.0 ! 2013-06 Setup avoiding MPI communication (I. Epicoco, S. Mocavero, CMCC)
570	!!----------------------------------------------------------------------
571
572	INTEGER :: sxM, dxM, sxT, dxT, jn
573	INTEGER :: njmppmax
574
575	njmppmax = MAXVAL( njmppt )
576
577	!initializes the north-fold communication variables
578	isendto(:) = 0
579	nsndto = 0
580
581	!if I am a process in the north
582	IF ( njmpp == njmppmax ) THEN
583	!sxM is the first point (in the global domain) needed to compute the
584	!north-fold for the current process
585	sxM = jpiglo - nimppt(narea) - nlcit(narea) + 1
586	!dxM is the last point (in the global domain) needed to compute the
587	!north-fold for the current process
588	dxM = jpiglo - nimppt(narea) + 2
589
590	!loop over the other north-fold processes to find the processes
591	!managing the points belonging to the sxT-dxT range
592	DO jn = jpnij - jpni +1, jpnij
593	IF ( njmppt(jn) == njmppmax ) THEN
594	!sxT is the first point (in the global domain) of the jn
595	!process
596	sxT = nimppt(jn)
597	!dxT is the last point (in the global domain) of the jn
598	!process
599	dxT = nimppt(jn) + nlcit(jn) - 1
600	IF ((sxM .gt. sxT) .AND. (sxM .lt. dxT)) THEN
601	nsndto = nsndto + 1
602	isendto(nsndto) = jn
603	ELSEIF ((sxM .le. sxT) .AND. (dxM .gt. dxT)) THEN
604	nsndto = nsndto + 1
605	isendto(nsndto) = jn
606	ELSEIF ((dxM .lt. dxT) .AND. (sxT .lt. dxM)) THEN
607	nsndto = nsndto + 1
608	isendto(nsndto) = jn
609	END IF
610	END IF
611	END DO
612	ENDIF
613	l_north_nogather = .TRUE.
614	END SUBROUTINE nemo_northcomms
615
616	#else
617	SUBROUTINE nemo_northcomms ! Dummy routine
618	WRITE(,) 'nemo_northcomms: You should not have seen this print! error?'
619	END SUBROUTINE nemo_northcomms
620	#endif
621	!!======================================================================
622	END MODULE nemogcm

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