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parallel_lmdz.F90 @ 5099

Last change on this file since 5099 was 5099, checked in by abarral, 2 months ago
Replace most uses of CPP_DUST by the corresponding logical defined in lmdz_cppkeys_wrapper.F90 Convert several files from .F to .f90 to allow Dust to compile w/o rrtm/ecrad Create lmdz_yoerad.f90 (lint) Remove "!" on otherwise empty line
Property copyright set to Name of program: LMDZ Creation date: 1984 Version: LMDZ5 License: CeCILL version 2 Holder: Laboratoire de m\'et\'eorologie dynamique, CNRS, UMR 8539 See the license file in the root directory
File size: 19.6 KB

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1
2	! $Id$
3
4	MODULE parallel_lmdz
5	USE mod_const_mpi
6	USE lmdz_mpi, ONLY : using_mpi
7	#ifdef CPP_IOIPSL
8	use IOIPSL
9	#else
10	! if not using IOIPSL, we still need to use (a local version of) getin
11	use ioipsl_getincom
12	#endif
13	INTEGER,PARAMETER :: halo_max=3
14
15	LOGICAL,SAVE :: using_omp ! .true. if using OpenMP
16	LOGICAL,SAVE :: is_master ! .true. if the core is both MPI & OpenMP master
17	!$OMP THREADPRIVATE(is_master)
18
19	integer, save :: mpi_size
20	integer, save :: mpi_rank
21	integer, save :: jj_begin
22	integer, save :: jj_end
23	integer, save :: jj_nb
24	integer, save :: ij_begin
25	integer, save :: ij_end
26	logical, save :: pole_nord
27	logical, save :: pole_sud
28
29	integer,save :: jjb_u
30	integer,save :: jje_u
31	integer,save :: jjnb_u
32	integer,save :: jjb_v
33	integer,save :: jje_v
34	integer,save :: jjnb_v
35
36	integer,save :: ijb_u
37	integer,save :: ije_u
38	integer,save :: ijnb_u
39
40	integer,save :: ijb_v
41	integer,save :: ije_v
42	integer,save :: ijnb_v
43
44
45	integer, allocatable, save, dimension(:) :: jj_begin_para
46	integer, allocatable, save, dimension(:) :: jj_end_para
47	integer, allocatable, save, dimension(:) :: jj_nb_para
48	integer, save :: OMP_CHUNK
49	integer, save :: omp_rank
50	integer, save :: omp_size
51	!$OMP THREADPRIVATE(omp_rank)
52
53	TYPE distrib
54	integer :: jj_begin
55	integer :: jj_end
56	integer :: jj_nb
57	integer :: ij_begin
58	integer :: ij_end
59
60	integer :: jjb_u
61	integer :: jje_u
62	integer :: jjnb_u
63	integer :: jjb_v
64	integer :: jje_v
65	integer :: jjnb_v
66
67	integer :: ijb_u
68	integer :: ije_u
69	integer :: ijnb_u
70
71	integer :: ijb_v
72	integer :: ije_v
73	integer :: ijnb_v
74
75
76	integer, pointer :: jj_begin_para(:) => NULL()
77	integer, pointer :: jj_end_para(:) => NULL()
78	integer, pointer :: jj_nb_para(:) => NULL()
79	END TYPE distrib
80
81	INTERFACE ASSIGNMENT (=)
82	MODULE PROCEDURE copy_distrib
83	END INTERFACE
84	TYPE(distrib),SAVE :: current_dist
85
86	contains
87
88	subroutine init_parallel
89	USE vampir
90	USE lmdz_mpi
91	implicit none
92	INCLUDE "dimensions.h"
93	INCLUDE "paramet.h"
94	INCLUDE "iniprint.h"
95
96	integer :: ierr
97	integer :: i,j
98	integer :: type_size
99	integer, dimension(3) :: blocklen,type
100	integer :: comp_id
101	character(len=4) :: num
102	character(len=20) :: filename
103
104	#ifdef CPP_OMP
105	INTEGER :: OMP_GET_NUM_THREADS
106	EXTERNAL OMP_GET_NUM_THREADS
107	INTEGER :: OMP_GET_THREAD_NUM
108	EXTERNAL OMP_GET_THREAD_NUM
109	#endif
110
111	#ifdef CPP_OMP
112	using_OMP=.TRUE.
113	#else
114	using_OMP=.FALSE.
115	#endif
116
117	call InitVampir
118
119	IF (using_mpi) THEN
120	call MPI_COMM_SIZE(COMM_LMDZ,mpi_size,ierr)
121	call MPI_COMM_RANK(COMM_LMDZ,mpi_rank,ierr)
122	ELSE
123	mpi_size=1
124	mpi_rank=0
125	ENDIF
126
127
128	! Open text output file with mpi_rank in suffix of file name
129	IF (lunout /= 5 .and. lunout /= 6) THEN
130	WRITE(num,'(I4.4)') mpi_rank
131	filename='lmdz.out_'//num
132	IF (mpi_rank /= 0) THEN
133	OPEN(UNIT=lunout,FILE=TRIM(filename),ACTION='write', &
134	STATUS='unknown',FORM='formatted',IOSTAT=ierr)
135	ENDIF
136	ENDIF
137
138
139	allocate(jj_begin_para(0:mpi_size-1))
140	allocate(jj_end_para(0:mpi_size-1))
141	allocate(jj_nb_para(0:mpi_size-1))
142
143	do i=0,mpi_size-1
144	jj_nb_para(i)=(jjm+1)/mpi_size
145	if ( i < MOD((jjm+1),mpi_size) ) jj_nb_para(i)=jj_nb_para(i)+1
146
147	if (jj_nb_para(i) <= 1 ) then
148
149	write(lunout,*)"Arret : le nombre de bande de lattitude par process est trop faible (<2)."
150	write(lunout,*)" ---> diminuez le nombre de CPU ou augmentez la taille en lattitude"
151
152	IF (using_mpi) call MPI_ABORT(COMM_LMDZ,-1, ierr)
153
154	endif
155
156	enddo
157
158	! jj_nb_para(0)=11
159	! jj_nb_para(1)=25
160	! jj_nb_para(2)=25
161	! jj_nb_para(3)=12
162
163	j=1
164
165	do i=0,mpi_size-1
166
167	jj_begin_para(i)=j
168	jj_end_para(i)=j+jj_Nb_para(i)-1
169	j=j+jj_Nb_para(i)
170
171	enddo
172
173	jj_begin = jj_begin_para(mpi_rank)
174	jj_end = jj_end_para(mpi_rank)
175	jj_nb = jj_nb_para(mpi_rank)
176
177	ij_begin=(jj_begin-1)*iip1+1
178	ij_end=jj_end*iip1
179
180	if (mpi_rank==0) then
181	pole_nord=.TRUE.
182	else
183	pole_nord=.FALSE.
184	endif
185
186	if (mpi_rank==mpi_size-1) then
187	pole_sud=.TRUE.
188	else
189	pole_sud=.FALSE.
190	endif
191
192	write(lunout,*)"init_parallel: jj_begin",jj_begin
193	write(lunout,*)"init_parallel: jj_end",jj_end
194	write(lunout,*)"init_parallel: ij_begin",ij_begin
195	write(lunout,*)"init_parallel: ij_end",ij_end
196	jjb_u=MAX(jj_begin-halo_max,1)
197	jje_u=MIN(jj_end+halo_max,jjp1)
198	jjnb_u=jje_u-jjb_u+1
199
200	jjb_v=MAX(jj_begin-halo_max,1)
201	jje_v=MIN(jj_end+halo_max,jjm)
202	jjnb_v=jje_v-jjb_v+1
203
204	ijb_u=MAX(ij_begin-halo_max*iip1,1)
205	ije_u=MIN(ij_end+halo_max*iip1,ip1jmp1)
206	ijnb_u=ije_u-ijb_u+1
207
208	ijb_v=MAX(ij_begin-halo_max*iip1,1)
209	ije_v=MIN(ij_end+halo_max*iip1,ip1jm)
210	ijnb_v=ije_v-ijb_v+1
211
212	!$OMP PARALLEL
213
214	#ifdef CPP_OMP
215	!$OMP MASTER
216	omp_size=OMP_GET_NUM_THREADS()
217	!$OMP END MASTER
218	!$OMP BARRIER
219	omp_rank=OMP_GET_THREAD_NUM()
220
221	!Config Key = omp_chunk
222	!Config Desc = taille des blocs openmp
223	!Config Def = 1
224	!Config Help = defini la taille des packets d'itération openmp
225	!Config distribue a chaque tache lors de l'entree dans une
226	!Config boucle parallelisee
227
228	!$OMP MASTER
229	omp_chunk=(llm+1)/omp_size
230	IF (MOD(llm+1,omp_size)/=0) omp_chunk=omp_chunk+1
231	CALL getin('omp_chunk',omp_chunk)
232	!$OMP END MASTER
233	!$OMP BARRIER
234	#else
235	omp_size=1
236	omp_rank=0
237	#endif
238	!$OMP END PARALLEL
239	CALL create_distrib(jj_nb_para,current_dist)
240
241	IF ((mpi_rank==0).and.(omp_rank==0)) THEN
242	is_master=.true.
243	ELSE
244	is_master=.false.
245	ENDIF
246
247	end subroutine init_parallel
248
249	SUBROUTINE create_distrib(jj_nb_new,d)
250	IMPLICIT NONE
251	INCLUDE "dimensions.h"
252	INCLUDE "paramet.h"
253
254	INTEGER,INTENT(IN) :: jj_Nb_New(0:MPI_Size-1)
255	TYPE(distrib),INTENT(INOUT) :: d
256	INTEGER :: i
257
258	IF (.NOT. ASSOCIATED(d%jj_nb_para)) ALLOCATE(d%jj_nb_para(0:MPI_Size-1))
259	IF (.NOT. ASSOCIATED(d%jj_begin_para)) ALLOCATE(d%jj_begin_para(0:MPI_Size-1))
260	IF (.NOT. ASSOCIATED(d%jj_end_para)) ALLOCATE(d%jj_end_para(0:MPI_Size-1))
261
262	d%jj_Nb_Para=jj_Nb_New
263
264	d%jj_begin_para(0)=1
265	d%jj_end_para(0)=d%jj_Nb_Para(0)
266
267	do i=1,mpi_size-1
268
269	d%jj_begin_para(i)=d%jj_end_para(i-1)+1
270	d%jj_end_para(i)=d%jj_begin_para(i)+d%jj_Nb_para(i)-1
271
272	enddo
273
274	d%jj_begin = d%jj_begin_para(mpi_rank)
275	d%jj_end = d%jj_end_para(mpi_rank)
276	d%jj_nb = d%jj_nb_para(mpi_rank)
277
278	d%ij_begin=(d%jj_begin-1)*iip1+1
279	d%ij_end=d%jj_end*iip1
280
281	d%jjb_u=MAX(d%jj_begin-halo_max,1)
282	d%jje_u=MIN(d%jj_end+halo_max,jjp1)
283	d%jjnb_u=d%jje_u-d%jjb_u+1
284
285	d%jjb_v=MAX(d%jj_begin-halo_max,1)
286	d%jje_v=MIN(d%jj_end+halo_max,jjm)
287	d%jjnb_v=d%jje_v-d%jjb_v+1
288
289	d%ijb_u=MAX(d%ij_begin-halo_max*iip1,1)
290	d%ije_u=MIN(d%ij_end+halo_max*iip1,ip1jmp1)
291	d%ijnb_u=d%ije_u-d%ijb_u+1
292
293	d%ijb_v=MAX(d%ij_begin-halo_max*iip1,1)
294	d%ije_v=MIN(d%ij_end+halo_max*iip1,ip1jm)
295	d%ijnb_v=d%ije_v-d%ijb_v+1
296
297	END SUBROUTINE create_distrib
298
299
300	SUBROUTINE Set_Distrib(d)
301	IMPLICIT NONE
302
303	INCLUDE "dimensions.h"
304	INCLUDE "paramet.h"
305	TYPE(distrib),INTENT(IN) :: d
306
307	jj_begin = d%jj_begin
308	jj_end = d%jj_end
309	jj_nb = d%jj_nb
310	ij_begin = d%ij_begin
311	ij_end = d%ij_end
312
313	jjb_u = d%jjb_u
314	jje_u = d%jje_u
315	jjnb_u = d%jjnb_u
316	jjb_v = d%jjb_v
317	jje_v = d%jje_v
318	jjnb_v = d%jjnb_v
319
320	ijb_u = d%ijb_u
321	ije_u = d%ije_u
322	ijnb_u = d%ijnb_u
323
324	ijb_v = d%ijb_v
325	ije_v = d%ije_v
326	ijnb_v = d%ijnb_v
327
328
329	jj_begin_para(:) = d%jj_begin_para(:)
330	jj_end_para(:) = d%jj_end_para(:)
331	jj_nb_para(:) = d%jj_nb_para(:)
332	current_dist=d
333
334	END SUBROUTINE Set_Distrib
335
336	SUBROUTINE copy_distrib(dist,new_dist)
337	IMPLICIT NONE
338
339	INCLUDE "dimensions.h"
340	INCLUDE "paramet.h"
341	TYPE(distrib),INTENT(INOUT) :: dist
342	TYPE(distrib),INTENT(IN) :: new_dist
343
344	dist%jj_begin = new_dist%jj_begin
345	dist%jj_end = new_dist%jj_end
346	dist%jj_nb = new_dist%jj_nb
347	dist%ij_begin = new_dist%ij_begin
348	dist%ij_end = new_dist%ij_end
349
350	dist%jjb_u = new_dist%jjb_u
351	dist%jje_u = new_dist%jje_u
352	dist%jjnb_u = new_dist%jjnb_u
353	dist%jjb_v = new_dist%jjb_v
354	dist%jje_v = new_dist%jje_v
355	dist%jjnb_v = new_dist%jjnb_v
356
357	dist%ijb_u = new_dist%ijb_u
358	dist%ije_u = new_dist%ije_u
359	dist%ijnb_u = new_dist%ijnb_u
360
361	dist%ijb_v = new_dist%ijb_v
362	dist%ije_v = new_dist%ije_v
363	dist%ijnb_v = new_dist%ijnb_v
364
365
366	dist%jj_begin_para(:) = new_dist%jj_begin_para(:)
367	dist%jj_end_para(:) = new_dist%jj_end_para(:)
368	dist%jj_nb_para(:) = new_dist%jj_nb_para(:)
369
370	END SUBROUTINE copy_distrib
371
372
373	SUBROUTINE get_current_distrib(d)
374	IMPLICIT NONE
375
376	INCLUDE "dimensions.h"
377	INCLUDE "paramet.h"
378	TYPE(distrib),INTENT(OUT) :: d
379
380	d=current_dist
381
382	END SUBROUTINE get_current_distrib
383
384	subroutine Finalize_parallel
385	USE lmdz_mpi
386	! ug Pour les sorties XIOS
387	USE wxios
388
389	#ifdef CPP_COUPLE
390	! Use of Oasis-MCT coupler
391	#if defined CPP_OMCT
392	use mod_prism
393	#else
394	use mod_prism_proto
395	#endif
396	! Ehouarn: surface_data module is in 'phylmd' ...
397	use surface_data, only : type_ocean
398	implicit none
399	#else
400	implicit none
401	! without the surface_data module, we declare (and set) a dummy 'type_ocean'
402	character(len=6),parameter :: type_ocean="dummy"
403	#endif
404
405	include "dimensions.h"
406	include "paramet.h"
407
408	integer :: ierr
409	integer :: i
410
411	if (allocated(jj_begin_para)) deallocate(jj_begin_para)
412	if (allocated(jj_end_para)) deallocate(jj_end_para)
413	if (allocated(jj_nb_para)) deallocate(jj_nb_para)
414
415	if (type_ocean == 'couple') then
416	#ifdef CPP_COUPLE
417	IF (using_xios) THEN
418	!Fermeture propre de XIOS
419	CALL wxios_close()
420	CALL prism_terminate_proto(ierr)
421	IF (ierr .ne. PRISM_Ok) THEN
422	CALL abort_gcm('Finalize_parallel',' Probleme dans prism_terminate_proto ',1)
423	ENDIF
424	ELSE
425	call prism_terminate_proto(ierr)
426	IF (ierr .ne. PRISM_Ok) THEN
427	call abort_gcm('Finalize_parallel',' Probleme dans prism_terminate_proto ',1)
428	endif
429	ENDIF
430	#else
431	call abort_gcm('Finalize_parallel','type_ocean = couple but CPP_COUPLE not defined',1)
432	#endif
433	else
434	IF (using_xios) THEN
435	!Fermeture propre de XIOS
436	CALL wxios_close()
437	ENDIF
438	IF (using_mpi) call MPI_FINALIZE(ierr)
439	end if
440
441	end subroutine Finalize_parallel
442
443	subroutine Pack_Data(Field,ij,ll,row,Buffer)
444	implicit none
445
446	INCLUDE "dimensions.h"
447	INCLUDE "paramet.h"
448
449	integer, intent(in) :: ij,ll,row
450	real,dimension(ij,ll),intent(in) ::Field
451	real,dimension(lliip1row), intent(out) :: Buffer
452
453	integer :: Pos
454	integer :: i,l
455
456	Pos=0
457	do l=1,ll
458	do i=1,row*iip1
459	Pos=Pos+1
460	Buffer(Pos)=Field(i,l)
461	enddo
462	enddo
463
464	end subroutine Pack_data
465
466	subroutine Unpack_Data(Field,ij,ll,row,Buffer)
467	implicit none
468
469	INCLUDE "dimensions.h"
470	INCLUDE "paramet.h"
471
472	integer, intent(in) :: ij,ll,row
473	real,dimension(ij,ll),intent(out) ::Field
474	real,dimension(lliip1row), intent(in) :: Buffer
475
476	integer :: Pos
477	integer :: i,l
478
479	Pos=0
480
481	do l=1,ll
482	do i=1,row*iip1
483	Pos=Pos+1
484	Field(i,l)=Buffer(Pos)
485	enddo
486	enddo
487
488	end subroutine UnPack_data
489
490
491	SUBROUTINE barrier
492	USE lmdz_mpi
493	IMPLICIT NONE
494	INTEGER :: ierr
495
496	!$OMP CRITICAL (MPI)
497	IF (using_mpi) CALL MPI_Barrier(COMM_LMDZ,ierr)
498	!$OMP END CRITICAL (MPI)
499
500	END SUBROUTINE barrier
501
502
503	subroutine exchange_hallo(Field,ij,ll,up,down)
504	USE lmdz_mpi
505	USE Vampir
506	implicit none
507	INCLUDE "dimensions.h"
508	INCLUDE "paramet.h"
509	INTEGER :: ij,ll
510	REAL, dimension(ij,ll) :: Field
511	INTEGER :: up,down
512
513	INTEGER :: ierr
514	LOGICAL :: SendUp,SendDown
515	LOGICAL :: RecvUp,RecvDown
516	INTEGER, DIMENSION(4) :: Request
517	INTEGER, DIMENSION(MPI_STATUS_SIZE,4) :: Status
518
519	INTEGER :: NbRequest
520	REAL, dimension(:),allocatable :: Buffer_Send_up,Buffer_Send_down
521	REAL, dimension(:),allocatable :: Buffer_Recv_up,Buffer_Recv_down
522	INTEGER :: Buffer_size
523
524	IF (using_mpi) THEN
525
526	CALL barrier
527
528	call VTb(VThallo)
529
530	SendUp=.TRUE.
531	SendDown=.TRUE.
532	RecvUp=.TRUE.
533	RecvDown=.TRUE.
534
535	IF (pole_nord) THEN
536	SendUp=.FALSE.
537	RecvUp=.FALSE.
538	ENDIF
539
540	IF (pole_sud) THEN
541	SendDown=.FALSE.
542	RecvDown=.FALSE.
543	ENDIF
544
545	if (up==0) then
546	SendDown=.FALSE.
547	RecvUp=.FALSE.
548	endif
549
550	if (down==0) then
551	SendUp=.FALSE.
552	RecvDown=.FALSE.
553	endif
554
555	NbRequest=0
556
557	IF (SendUp) THEN
558	NbRequest=NbRequest+1
559	buffer_size=downiip1ll
560	allocate(Buffer_Send_up(Buffer_size))
561	call PACK_Data(Field(ij_begin,1),ij,ll,down,Buffer_Send_up)
562	!$OMP CRITICAL (MPI)
563	call MPI_ISEND(Buffer_send_up,Buffer_Size,MPI_REAL8,MPI_Rank-1,1, &
564	COMM_LMDZ,Request(NbRequest),ierr)
565	!$OMP END CRITICAL (MPI)
566	ENDIF
567
568	IF (SendDown) THEN
569	NbRequest=NbRequest+1
570
571	buffer_size=upiip1ll
572	allocate(Buffer_Send_down(Buffer_size))
573	call PACK_Data(Field(ij_end+1-up*iip1,1),ij,ll,up,Buffer_send_down)
574
575	!$OMP CRITICAL (MPI)
576	call MPI_ISEND(Buffer_send_down,Buffer_Size,MPI_REAL8,MPI_Rank+1,1, &
577	COMM_LMDZ,Request(NbRequest),ierr)
578	!$OMP END CRITICAL (MPI)
579	ENDIF
580
581
582	IF (RecvUp) THEN
583	NbRequest=NbRequest+1
584	buffer_size=upiip1ll
585	allocate(Buffer_recv_up(Buffer_size))
586
587	!$OMP CRITICAL (MPI)
588	call MPI_IRECV(Buffer_recv_up,Buffer_size,MPI_REAL8,MPI_Rank-1,1, &
589	COMM_LMDZ,Request(NbRequest),ierr)
590	!$OMP END CRITICAL (MPI)
591
592
593	ENDIF
594
595	IF (RecvDown) THEN
596	NbRequest=NbRequest+1
597	buffer_size=downiip1ll
598	allocate(Buffer_recv_down(Buffer_size))
599
600	!$OMP CRITICAL (MPI)
601	call MPI_IRECV(Buffer_recv_down,Buffer_size,MPI_REAL8,MPI_Rank+1,1, &
602	COMM_LMDZ,Request(NbRequest),ierr)
603	!$OMP END CRITICAL (MPI)
604
605	ENDIF
606
607	if (NbRequest > 0) call MPI_WAITALL(NbRequest,Request,Status,ierr)
608	IF (RecvUp) call Unpack_Data(Field(ij_begin-up*iip1,1),ij,ll,up,Buffer_Recv_up)
609	IF (RecvDown) call Unpack_Data(Field(ij_end+1,1),ij,ll,down,Buffer_Recv_down)
610
611	call VTe(VThallo)
612	call barrier
613
614	ENDIF ! using_mpi
615
616	RETURN
617
618	end subroutine exchange_Hallo
619
620
621	subroutine Gather_Field(Field,ij,ll,rank)
622	USE lmdz_mpi
623	implicit none
624	INCLUDE "dimensions.h"
625	INCLUDE "paramet.h"
626	INCLUDE "iniprint.h"
627	INTEGER :: ij,ll,rank
628	REAL, dimension(ij,ll) :: Field
629	REAL, dimension(:),allocatable :: Buffer_send
630	REAL, dimension(:),allocatable :: Buffer_Recv
631	INTEGER, dimension(0:MPI_Size-1) :: Recv_count, displ
632	INTEGER :: ierr
633	INTEGER ::i
634
635	IF (using_mpi) THEN
636
637	if (ij==ip1jmp1) then
638	allocate(Buffer_send(iip1ll(jj_end-jj_begin+1)))
639	call Pack_Data(Field(ij_begin,1),ij,ll,jj_end-jj_begin+1,Buffer_send)
640	else if (ij==ip1jm) then
641	allocate(Buffer_send(iip1ll(min(jj_end,jjm)-jj_begin+1)))
642	call Pack_Data(Field(ij_begin,1),ij,ll,min(jj_end,jjm)-jj_begin+1,Buffer_send)
643	else
644	write(lunout,*)ij
645	CALL abort_gcm("parallel_lmdz","erreur dans Gather_Field",1)
646	endif
647
648	if (MPI_Rank==rank) then
649	allocate(Buffer_Recv(ij*ll))
650
651	!CDIR NOVECTOR
652	do i=0,MPI_Size-1
653
654	if (ij==ip1jmp1) then
655	Recv_count(i)=(jj_end_para(i)-jj_begin_para(i)+1)lliip1
656	else if (ij==ip1jm) then
657	Recv_count(i)=(min(jj_end_para(i),jjm)-jj_begin_para(i)+1)lliip1
658	else
659	CALL abort_gcm("parallel_lmdz","erreur dans Gather_Field",1)
660	endif
661
662	if (i==0) then
663	displ(i)=0
664	else
665	displ(i)=displ(i-1)+Recv_count(i-1)
666	endif
667
668	enddo
669
670	else
671	! Ehouarn: When in debug mode, ifort complains (for call MPI_GATHERV
672	! below) about Buffer_Recv() being not allocated.
673	! So make a dummy allocation.
674	allocate(Buffer_Recv(1))
675	endif ! of if (MPI_Rank==rank)
676
677	!$OMP CRITICAL (MPI)
678	call MPI_GATHERV(Buffer_send,(min(ij_end,ij)-ij_begin+1)*ll,MPI_REAL8, &
679	Buffer_Recv,Recv_count,displ,MPI_REAL8,rank,COMM_LMDZ,ierr)
680	!$OMP END CRITICAL (MPI)
681
682	if (MPI_Rank==rank) then
683
684	if (ij==ip1jmp1) then
685	do i=0,MPI_Size-1
686	call Unpack_Data(Field((jj_begin_para(i)-1)*iip1+1,1),ij,ll, &
687	jj_end_para(i)-jj_begin_para(i)+1,Buffer_Recv(displ(i)+1))
688	enddo
689	else if (ij==ip1jm) then
690	do i=0,MPI_Size-1
691	call Unpack_Data(Field((jj_begin_para(i)-1)*iip1+1,1),ij,ll, &
692	min(jj_end_para(i),jjm)-jj_begin_para(i)+1,Buffer_Recv(displ(i)+1))
693	enddo
694	endif
695	endif
696	ENDIF ! using_mpi
697
698	end subroutine Gather_Field
699
700
701	subroutine AllGather_Field(Field,ij,ll)
702	USE lmdz_mpi
703	implicit none
704	INCLUDE "dimensions.h"
705	INCLUDE "paramet.h"
706	INTEGER :: ij,ll
707	REAL, dimension(ij,ll) :: Field
708	INTEGER :: ierr
709
710	IF (using_mpi) THEN
711	call Gather_Field(Field,ij,ll,0)
712	!$OMP CRITICAL (MPI)
713	call MPI_BCAST(Field,ij*ll,MPI_REAL8,0,COMM_LMDZ,ierr)
714	!$OMP END CRITICAL (MPI)
715	ENDIF
716
717	end subroutine AllGather_Field
718
719	subroutine Broadcast_Field(Field,ij,ll,rank)
720	USE lmdz_mpi
721	implicit none
722	INCLUDE "dimensions.h"
723	INCLUDE "paramet.h"
724	INTEGER :: ij,ll
725	REAL, dimension(ij,ll) :: Field
726	INTEGER :: rank
727	INTEGER :: ierr
728
729	IF (using_mpi) THEN
730
731	!$OMP CRITICAL (MPI)
732	call MPI_BCAST(Field,ij*ll,MPI_REAL8,rank,COMM_LMDZ,ierr)
733	!$OMP END CRITICAL (MPI)
734
735	ENDIF
736	end subroutine Broadcast_Field
737
738
739	! Subroutine verif_hallo(Field,ij,ll,up,down)
740	! USE lmdz_mpi
741	! implicit none
742	! INCLUDE "dimensions.h"
743	! INCLUDE "paramet.h"
744
745	! INTEGER :: ij,ll
746	! REAL, dimension(ij,ll) :: Field
747	! INTEGER :: up,down
748
749	! REAL,dimension(ij,ll): NewField
750
751	! NewField=0
752
753	! ijb=ij_begin
754	! ije=ij_end
755	! if (pole_nord)
756	! NewField(ij_be
757
758	end MODULE parallel_lmdz

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