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source: palm/trunk/SOURCE/init_pegrid.f90 @ 1321

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1	SUBROUTINE init_pegrid
2
3	!--------------------------------------------------------------------------------!
4	! This file is part of PALM.
5	!
6	! PALM is free software: you can redistribute it and/or modify it under the terms
7	! of the GNU General Public License as published by the Free Software Foundation,
8	! either version 3 of the License, or (at your option) any later version.
9	!
10	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
11	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
12	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
13	!
14	! You should have received a copy of the GNU General Public License along with
15	! PALM. If not, see <http://www.gnu.org/licenses/>.
16	!
17	! Copyright 1997-2014 Leibniz Universitaet Hannover
18	!--------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! -----------------
22	!
23	! Former revisions:
24	! -----------------
25	! $Id: init_pegrid.f90 1321 2014-03-20 09:40:40Z raasch $
26	!
27	! 1320 2014-03-20 08:40:49Z raasch
28	! ONLY-attribute added to USE-statements,
29	! kind-parameters added to all INTEGER and REAL declaration statements,
30	! kinds are defined in new module kinds,
31	! revision history before 2012 removed,
32	! comment fields (!:) to be used for variable explanations added to
33	! all variable declaration statements
34	!
35	! 1304 2014-03-12 10:29:42Z raasch
36	! bugfix: single core MPI runs missed some settings of transpose indices
37	!
38	! 1212 2013-08-15 08:46:27Z raasch
39	! error message for poisfft_hybrid removed
40	!
41	! 1159 2013-05-21 11:58:22Z fricke
42	! dirichlet/neumann and neumann/dirichlet removed
43	!
44	! 1139 2013-04-18 07:25:03Z raasch
45	! bugfix for calculating the id of the PE carrying the recycling plane
46	!
47	! 1111 2013-03-08 23:54:10Z raasch
48	! initialization of poisfft moved to module poisfft
49	!
50	! 1092 2013-02-02 11:24:22Z raasch
51	! unused variables removed
52	!
53	! 1056 2012-11-16 15:28:04Z raasch
54	! Indices for arrays n.._mg start from zero due to definition of arrays f2 and
55	! p2 as automatic arrays in recursive subroutine next_mg_level
56	!
57	! 1041 2012-11-06 02:36:29Z raasch
58	! a 2d virtual processor topology is used by default for all machines
59	!
60	! 1036 2012-10-22 13:43:42Z raasch
61	! code put under GPL (PALM 3.9)
62	!
63	! 1003 2012-09-14 14:35:53Z raasch
64	! subdomains must have identical size (grid matching = "match" removed)
65	!
66	! 1001 2012-09-13 14:08:46Z raasch
67	! all actions concerning upstream-spline-method removed
68	!
69	! 978 2012-08-09 08:28:32Z fricke
70	! dirichlet/neumann and neumann/dirichlet added
71	! nxlu and nysv are also calculated for inflow boundary
72	!
73	! 809 2012-01-30 13:32:58Z maronga
74	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
75	!
76	! 807 2012-01-25 11:53:51Z maronga
77	! New cpp directive "__check" implemented which is used by check_namelist_files
78	!
79	! Revision 1.1 1997/07/24 11:15:09 raasch
80	! Initial revision
81	!
82	!
83	! Description:
84	! ------------
85	! Determination of the virtual processor topology (if not prescribed by the
86	! user)and computation of the grid point number and array bounds of the local
87	! domains.
88	!------------------------------------------------------------------------------!
89
90	USE control_parameters, &
91	ONLY: bc_lr, bc_ns, coupling_mode, coupling_topology, dt_dosp, &
92	gathered_size, grid_level, grid_level_count, host, inflow_l, &
93	inflow_n, inflow_r, inflow_s, io_blocks, io_group, &
94	maximum_grid_level, maximum_parallel_io_streams, message_string,&
95	mg_switch_to_pe0_level, momentum_advec, psolver, outflow_l, &
96	outflow_n, outflow_r, outflow_s, recycling_width, scalar_advec, &
97	subdomain_size
98
99	USE grid_variables, &
100	ONLY: dx
101
102	USE indices, &
103	ONLY: mg_loc_ind, nbgp, nnx, nny, nnz, nx, nx_a, nx_o, nxl, nxl_mg, &
104	nxlu, nxr, nxr_mg, ny, ny_a, ny_o, nyn, nyn_mg, nys, nys_mg, &
105	nysv, nz, nzb, nzt, nzt_mg, wall_flags_1, wall_flags_2, &
106	wall_flags_3, wall_flags_4, wall_flags_5, wall_flags_6, &
107	wall_flags_7, wall_flags_8, wall_flags_9, wall_flags_10
108
109	USE kinds
110
111	USE pegrid
112
113	USE transpose_indices, &
114	ONLY: nxl_y, nxl_yd, nxl_z, nxr_y, nxr_yd, nxr_z, nyn_x, nyn_z, nys_x,&
115	nys_z, nzb_x, nzb_y, nzb_yd, nzt_x, nzt_yd, nzt_y
116
117	IMPLICIT NONE
118
119	INTEGER(iwp) :: i !:
120	INTEGER(iwp) :: id_inflow_l !:
121	INTEGER(iwp) :: id_recycling_l !:
122	INTEGER(iwp) :: ind(5) !:
123	INTEGER(iwp) :: j !:
124	INTEGER(iwp) :: k !:
125	INTEGER(iwp) :: maximum_grid_level_l !:
126	INTEGER(iwp) :: mg_levels_x !:
127	INTEGER(iwp) :: mg_levels_y !:
128	INTEGER(iwp) :: mg_levels_z !:
129	INTEGER(iwp) :: mg_switch_to_pe0_level_l !:
130	INTEGER(iwp) :: nnx_y !:
131	INTEGER(iwp) :: nnx_z !:
132	INTEGER(iwp) :: nny_x !:
133	INTEGER(iwp) :: nny_z !:
134	INTEGER(iwp) :: nnz_x !:
135	INTEGER(iwp) :: nnz_y !:
136	INTEGER(iwp) :: numproc_sqr !:
137	INTEGER(iwp) :: nxl_l !:
138	INTEGER(iwp) :: nxr_l !:
139	INTEGER(iwp) :: nyn_l !:
140	INTEGER(iwp) :: nys_l !:
141	INTEGER(iwp) :: nzb_l !:
142	INTEGER(iwp) :: nzt_l !:
143	INTEGER(iwp) :: omp_get_num_threads !:
144
145	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: ind_all !:
146	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxlf !:
147	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxrf !:
148	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nynf !:
149	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nysf !:
150
151	INTEGER(iwp), DIMENSION(2) :: pdims_remote !:
152
153	#if defined( __mpi2 )
154	LOGICAL :: found !:
155	#endif
156
157	!
158	!-- Get the number of OpenMP threads
159	!$OMP PARALLEL
160	#if defined( __intel_openmp_bug )
161	threads_per_task = omp_get_num_threads()
162	#else
163	!$ threads_per_task = omp_get_num_threads()
164	#endif
165	!$OMP END PARALLEL
166
167
168	#if defined( __parallel )
169
170	!
171	!-- Determine the processor topology or check it, if prescribed by the user
172	IF ( npex == -1 .AND. npey == -1 ) THEN
173
174	!
175	!-- Automatic determination of the topology
176	numproc_sqr = SQRT( REAL( numprocs ) )
177	pdims(1) = MAX( numproc_sqr , 1 )
178	DO WHILE ( MOD( numprocs , pdims(1) ) /= 0 )
179	pdims(1) = pdims(1) - 1
180	ENDDO
181	pdims(2) = numprocs / pdims(1)
182
183	ELSEIF ( npex /= -1 .AND. npey /= -1 ) THEN
184
185	!
186	!-- Prescribed by user. Number of processors on the prescribed topology
187	!-- must be equal to the number of PEs available to the job
188	IF ( ( npex * npey ) /= numprocs ) THEN
189	WRITE( message_string, * ) 'number of PEs of the prescribed ', &
190	'topology (', npex*npey,') does not match & the number of ', &
191	'PEs available to the job (', numprocs, ')'
192	CALL message( 'init_pegrid', 'PA0221', 1, 2, 0, 6, 0 )
193	ENDIF
194	pdims(1) = npex
195	pdims(2) = npey
196
197	ELSE
198	!
199	!-- If the processor topology is prescribed by the user, the number of
200	!-- PEs must be given in both directions
201	message_string = 'if the processor topology is prescribed by the, ' // &
202	' user& both values of "npex" and "npey" must be given ' // &
203	'in the &NAMELIST-parameter file'
204	CALL message( 'init_pegrid', 'PA0222', 1, 2, 0, 6, 0 )
205
206	ENDIF
207
208	!
209	!-- For communication speedup, set barriers in front of collective
210	!-- communications by default on SGI-type systems
211	IF ( host(3:5) == 'sgi' ) collective_wait = .TRUE.
212
213	!
214	!-- If necessary, set horizontal boundary conditions to non-cyclic
215	IF ( bc_lr /= 'cyclic' ) cyclic(1) = .FALSE.
216	IF ( bc_ns /= 'cyclic' ) cyclic(2) = .FALSE.
217
218
219	#if ! defined( __check)
220	!
221	!-- Create the virtual processor grid
222	CALL MPI_CART_CREATE( comm_palm, ndim, pdims, cyclic, reorder, &
223	comm2d, ierr )
224	CALL MPI_COMM_RANK( comm2d, myid, ierr )
225	WRITE (myid_char,'(''_'',I4.4)') myid
226
227	CALL MPI_CART_COORDS( comm2d, myid, ndim, pcoord, ierr )
228	CALL MPI_CART_SHIFT( comm2d, 0, 1, pleft, pright, ierr )
229	CALL MPI_CART_SHIFT( comm2d, 1, 1, psouth, pnorth, ierr )
230
231	!
232	!-- Determine sub-topologies for transpositions
233	!-- Transposition from z to x:
234	remain_dims(1) = .TRUE.
235	remain_dims(2) = .FALSE.
236	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dx, ierr )
237	CALL MPI_COMM_RANK( comm1dx, myidx, ierr )
238	!
239	!-- Transposition from x to y
240	remain_dims(1) = .FALSE.
241	remain_dims(2) = .TRUE.
242	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dy, ierr )
243	CALL MPI_COMM_RANK( comm1dy, myidy, ierr )
244
245	#endif
246
247	!
248	!-- Calculate array bounds along x-direction for every PE.
249	ALLOCATE( nxlf(0:pdims(1)-1), nxrf(0:pdims(1)-1), nynf(0:pdims(2)-1), &
250	nysf(0:pdims(2)-1) )
251
252	IF ( MOD( nx+1 , pdims(1) ) /= 0 ) THEN
253	WRITE( message_string, * ) 'x-direction: gridpoint number (',nx+1,') ',&
254	'is not an& integral divisor of the number ', &
255	'processors (', pdims(1),')'
256	CALL message( 'init_pegrid', 'PA0225', 1, 2, 0, 6, 0 )
257	ELSE
258	nnx = ( nx + 1 ) / pdims(1)
259	IF ( nnx*pdims(1) - ( nx + 1) > nnx ) THEN
260	WRITE( message_string, * ) 'x-direction: nx does not match the', &
261	'requirements given by the number of PEs &used', &
262	'& please use nx = ', nx - ( pdims(1) - ( nnx*pdims(1) &
263	- ( nx + 1 ) ) ), ' instead of nx =', nx
264	CALL message( 'init_pegrid', 'PA0226', 1, 2, 0, 6, 0 )
265	ENDIF
266	ENDIF
267
268	!
269	!-- Left and right array bounds, number of gridpoints
270	DO i = 0, pdims(1)-1
271	nxlf(i) = i * nnx
272	nxrf(i) = ( i + 1 ) * nnx - 1
273	ENDDO
274
275	!
276	!-- Calculate array bounds in y-direction for every PE.
277	IF ( MOD( ny+1 , pdims(2) ) /= 0 ) THEN
278	WRITE( message_string, * ) 'y-direction: gridpoint number (',ny+1,') ', &
279	'is not an& integral divisor of the number of', &
280	'processors (', pdims(2),')'
281	CALL message( 'init_pegrid', 'PA0227', 1, 2, 0, 6, 0 )
282	ELSE
283	nny = ( ny + 1 ) / pdims(2)
284	IF ( nny*pdims(2) - ( ny + 1) > nny ) THEN
285	WRITE( message_string, * ) 'y-direction: ny does not match the', &
286	'requirements given by the number of PEs &used ', &
287	'& please use ny = ', ny - ( pdims(2) - ( nnx*pdims(2) &
288	- ( ny + 1 ) ) ), ' instead of ny =', ny
289	CALL message( 'init_pegrid', 'PA0228', 1, 2, 0, 6, 0 )
290	ENDIF
291	ENDIF
292
293	!
294	!-- South and north array bounds
295	DO j = 0, pdims(2)-1
296	nysf(j) = j * nny
297	nynf(j) = ( j + 1 ) * nny - 1
298	ENDDO
299
300	!
301	!-- Local array bounds of the respective PEs
302	nxl = nxlf(pcoord(1))
303	nxr = nxrf(pcoord(1))
304	nys = nysf(pcoord(2))
305	nyn = nynf(pcoord(2))
306	nzb = 0
307	nzt = nz
308	nnz = nz
309
310	!
311	!-- Set switches to define if the PE is situated at the border of the virtual
312	!-- processor grid
313	IF ( nxl == 0 ) left_border_pe = .TRUE.
314	IF ( nxr == nx ) right_border_pe = .TRUE.
315	IF ( nys == 0 ) south_border_pe = .TRUE.
316	IF ( nyn == ny ) north_border_pe = .TRUE.
317
318	!
319	!-- Calculate array bounds and gridpoint numbers for the transposed arrays
320	!-- (needed in the pressure solver)
321	!-- For the transposed arrays, cyclic boundaries as well as top and bottom
322	!-- boundaries are omitted, because they are obstructive to the transposition
323
324	!
325	!-- 1. transposition z --> x
326	!-- This transposition is not neccessary in case of a 1d-decomposition along x
327	nys_x = nys
328	nyn_x = nyn
329	nny_x = nny
330	nnz_x = nz / pdims(1)
331	nzb_x = 1 + myidx * nnz_x
332	nzt_x = ( myidx + 1 ) * nnz_x
333	sendrecvcount_zx = nnx * nny * nnz_x
334
335	IF ( pdims(2) /= 1 ) THEN
336	IF ( MOD( nz , pdims(1) ) /= 0 ) THEN
337	WRITE( message_string, * ) 'transposition z --> x:', &
338	'&nz=',nz,' is not an integral divisior of pdims(1)=', &
339	pdims(1)
340	CALL message( 'init_pegrid', 'PA0230', 1, 2, 0, 6, 0 )
341	ENDIF
342	ENDIF
343
344	!
345	!-- 2. transposition x --> y
346	nnz_y = nnz_x
347	nzb_y = nzb_x
348	nzt_y = nzt_x
349	IF ( MOD( nx+1 , pdims(2) ) /= 0 ) THEN
350	WRITE( message_string, * ) 'transposition x --> y:', &
351	'&nx+1=',nx+1,' is not an integral divisor of ',&
352	'pdims(2)=',pdims(2)
353	CALL message( 'init_pegrid', 'PA0231', 1, 2, 0, 6, 0 )
354	ENDIF
355	nnx_y = (nx+1) / pdims(2)
356	nxl_y = myidy * nnx_y
357	nxr_y = ( myidy + 1 ) * nnx_y - 1
358	sendrecvcount_xy = nnx_y * nny_x * nnz_y
359
360	!
361	!-- 3. transposition y --> z (ELSE: x --> y in case of 1D-decomposition
362	!-- along x)
363	nnx_z = nnx_y
364	nxl_z = nxl_y
365	nxr_z = nxr_y
366	nny_z = (ny+1) / pdims(1)
367	nys_z = myidx * nny_z
368	nyn_z = ( myidx + 1 ) * nny_z - 1
369	sendrecvcount_yz = nnx_y * nny_z * nnz_y
370
371	IF ( pdims(2) /= 1 ) THEN
372	!
373	!-- y --> z
374	!-- This transposition is not neccessary in case of a 1d-decomposition
375	!-- along x, except that the uptream-spline method is switched on
376	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
377	WRITE( message_string, * ) 'transposition y --> z:', &
378	'& ny+1=',ny+1,' is not an integral divisor of ',&
379	'pdims(1)=',pdims(1)
380	CALL message( 'init_pegrid', 'PA0232', 1, 2, 0, 6, 0 )
381	ENDIF
382
383	ELSE
384	!
385	!-- x --> y. This condition must be fulfilled for a 1D-decomposition along x
386	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
387	WRITE( message_string, * ) 'transposition x --> y:', &
388	'& ny+1=',ny+1,' is not an integral divisor of ',&
389	'pdims(1)=',pdims(1)
390	CALL message( 'init_pegrid', 'PA0233', 1, 2, 0, 6, 0 )
391	ENDIF
392
393	ENDIF
394
395	!
396	!-- Indices for direct transpositions z --> y (used for calculating spectra)
397	IF ( dt_dosp /= 9999999.9 ) THEN
398	IF ( MOD( nz, pdims(2) ) /= 0 ) THEN
399	WRITE( message_string, * ) 'direct transposition z --> y (needed ', &
400	'for spectra):& nz=',nz,' is not an integral divisor of ',&
401	'pdims(2)=',pdims(2)
402	CALL message( 'init_pegrid', 'PA0234', 1, 2, 0, 6, 0 )
403	ELSE
404	nxl_yd = nxl
405	nxr_yd = nxr
406	nzb_yd = 1 + myidy * ( nz / pdims(2) )
407	nzt_yd = ( myidy + 1 ) * ( nz / pdims(2) )
408	sendrecvcount_zyd = nnx * nny * ( nz / pdims(2) )
409	ENDIF
410	ENDIF
411
412	!
413	!-- Indices for direct transpositions y --> x (they are only possible in case
414	!-- of a 1d-decomposition along x)
415	IF ( pdims(2) == 1 ) THEN
416	nny_x = nny / pdims(1)
417	nys_x = myid * nny_x
418	nyn_x = ( myid + 1 ) * nny_x - 1
419	nzb_x = 1
420	nzt_x = nz
421	sendrecvcount_xy = nnx * nny_x * nz
422	ENDIF
423
424	!
425	!-- Indices for direct transpositions x --> y (they are only possible in case
426	!-- of a 1d-decomposition along y)
427	IF ( pdims(1) == 1 ) THEN
428	nnx_y = nnx / pdims(2)
429	nxl_y = myid * nnx_y
430	nxr_y = ( myid + 1 ) * nnx_y - 1
431	nzb_y = 1
432	nzt_y = nz
433	sendrecvcount_xy = nnx_y * nny * nz
434	ENDIF
435
436	!
437	!-- Arrays for storing the array bounds are needed any more
438	DEALLOCATE( nxlf , nxrf , nynf , nysf )
439
440
441	#if ! defined( __check)
442	!
443	!-- Collect index bounds from other PEs (to be written to restart file later)
444	ALLOCATE( hor_index_bounds(4,0:numprocs-1) )
445
446	IF ( myid == 0 ) THEN
447
448	hor_index_bounds(1,0) = nxl
449	hor_index_bounds(2,0) = nxr
450	hor_index_bounds(3,0) = nys
451	hor_index_bounds(4,0) = nyn
452
453	!
454	!-- Receive data from all other PEs
455	DO i = 1, numprocs-1
456	CALL MPI_RECV( ibuf, 4, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
457	ierr )
458	hor_index_bounds(:,i) = ibuf(1:4)
459	ENDDO
460
461	ELSE
462	!
463	!-- Send index bounds to PE0
464	ibuf(1) = nxl
465	ibuf(2) = nxr
466	ibuf(3) = nys
467	ibuf(4) = nyn
468	CALL MPI_SEND( ibuf, 4, MPI_INTEGER, 0, myid, comm2d, ierr )
469
470	ENDIF
471
472	#endif
473
474	#if defined( __print )
475	!
476	!-- Control output
477	IF ( myid == 0 ) THEN
478	PRINT, ' processor topology *'
479	PRINT*, ' '
480	PRINT*, 'myid pcoord left right south north idx idy nxl: nxr',&
481	&' nys: nyn'
482	PRINT*, '------------------------------------------------------------',&
483	&'-----------'
484	WRITE (*,1000) 0, pcoord(1), pcoord(2), pleft, pright, psouth, pnorth, &
485	myidx, myidy, nxl, nxr, nys, nyn
486	1000 FORMAT (I4,2X,'(',I3,',',I3,')',3X,I4,2X,I4,3X,I4,2X,I4,2X,I3,1X,I3, &
487	2(2X,I4,':',I4))
488
489	!
490	!-- Receive data from the other PEs
491	DO i = 1,numprocs-1
492	CALL MPI_RECV( ibuf, 12, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
493	ierr )
494	WRITE (*,1000) i, ( ibuf(j) , j = 1,12 )
495	ENDDO
496	ELSE
497
498	!
499	!-- Send data to PE0
500	ibuf(1) = pcoord(1); ibuf(2) = pcoord(2); ibuf(3) = pleft
501	ibuf(4) = pright; ibuf(5) = psouth; ibuf(6) = pnorth; ibuf(7) = myidx
502	ibuf(8) = myidy; ibuf(9) = nxl; ibuf(10) = nxr; ibuf(11) = nys
503	ibuf(12) = nyn
504	CALL MPI_SEND( ibuf, 12, MPI_INTEGER, 0, myid, comm2d, ierr )
505	ENDIF
506	#endif
507
508	#if defined( __parallel ) && ! defined( __check)
509	#if defined( __mpi2 )
510	!
511	!-- In case of coupled runs, get the port name on PE0 of the atmosphere model
512	!-- and pass it to PE0 of the ocean model
513	IF ( myid == 0 ) THEN
514
515	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
516
517	CALL MPI_OPEN_PORT( MPI_INFO_NULL, port_name, ierr )
518
519	CALL MPI_PUBLISH_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, &
520	ierr )
521
522	!
523	!-- Write a flag file for the ocean model and the other atmosphere
524	!-- processes.
525	!-- There seems to be a bug in MPICH2 which causes hanging processes
526	!-- in case that execution of LOOKUP_NAME is continued too early
527	!-- (i.e. before the port has been created)
528	OPEN( 90, FILE='COUPLING_PORT_OPENED', FORM='FORMATTED' )
529	WRITE ( 90, '(''TRUE'')' )
530	CLOSE ( 90 )
531
532	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
533
534	!
535	!-- Continue only if the atmosphere model has created the port.
536	!-- There seems to be a bug in MPICH2 which causes hanging processes
537	!-- in case that execution of LOOKUP_NAME is continued too early
538	!-- (i.e. before the port has been created)
539	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
540	DO WHILE ( .NOT. found )
541	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
542	ENDDO
543
544	CALL MPI_LOOKUP_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, ierr )
545
546	ENDIF
547
548	ENDIF
549
550	!
551	!-- In case of coupled runs, establish the connection between the atmosphere
552	!-- and the ocean model and define the intercommunicator (comm_inter)
553	CALL MPI_BARRIER( comm2d, ierr )
554	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
555
556	CALL MPI_COMM_ACCEPT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
557	comm_inter, ierr )
558	coupling_mode_remote = 'ocean_to_atmosphere'
559
560	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
561
562	CALL MPI_COMM_CONNECT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
563	comm_inter, ierr )
564	coupling_mode_remote = 'atmosphere_to_ocean'
565
566	ENDIF
567	#endif
568
569	!
570	!-- Determine the number of ghost point layers
571	IF ( scalar_advec == 'ws-scheme' .OR. momentum_advec == 'ws-scheme' ) THEN
572	nbgp = 3
573	ELSE
574	nbgp = 1
575	ENDIF
576
577	!
578	!-- Create a new MPI derived datatype for the exchange of surface (xy) data,
579	!-- which is needed for coupled atmosphere-ocean runs.
580	!-- First, calculate number of grid points of an xy-plane.
581	ngp_xy = ( nxr - nxl + 1 + 2 * nbgp ) * ( nyn - nys + 1 + 2 * nbgp )
582	CALL MPI_TYPE_VECTOR( ngp_xy, 1, nzt-nzb+2, MPI_REAL, type_xy, ierr )
583	CALL MPI_TYPE_COMMIT( type_xy, ierr )
584
585	IF ( TRIM( coupling_mode ) /= 'uncoupled' ) THEN
586
587	!
588	!-- Pass the number of grid points of the atmosphere model to
589	!-- the ocean model and vice versa
590	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
591
592	nx_a = nx
593	ny_a = ny
594
595	IF ( myid == 0 ) THEN
596
597	CALL MPI_SEND( nx_a, 1, MPI_INTEGER, numprocs, 1, comm_inter, &
598	ierr )
599	CALL MPI_SEND( ny_a, 1, MPI_INTEGER, numprocs, 2, comm_inter, &
600	ierr )
601	CALL MPI_SEND( pdims, 2, MPI_INTEGER, numprocs, 3, comm_inter, &
602	ierr )
603	CALL MPI_RECV( nx_o, 1, MPI_INTEGER, numprocs, 4, comm_inter, &
604	status, ierr )
605	CALL MPI_RECV( ny_o, 1, MPI_INTEGER, numprocs, 5, comm_inter, &
606	status, ierr )
607	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, numprocs, 6, &
608	comm_inter, status, ierr )
609	ENDIF
610
611	CALL MPI_BCAST( nx_o, 1, MPI_INTEGER, 0, comm2d, ierr )
612	CALL MPI_BCAST( ny_o, 1, MPI_INTEGER, 0, comm2d, ierr )
613	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr )
614
615	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
616
617	nx_o = nx
618	ny_o = ny
619
620	IF ( myid == 0 ) THEN
621
622	CALL MPI_RECV( nx_a, 1, MPI_INTEGER, 0, 1, comm_inter, status, &
623	ierr )
624	CALL MPI_RECV( ny_a, 1, MPI_INTEGER, 0, 2, comm_inter, status, &
625	ierr )
626	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, 0, 3, comm_inter, &
627	status, ierr )
628	CALL MPI_SEND( nx_o, 1, MPI_INTEGER, 0, 4, comm_inter, ierr )
629	CALL MPI_SEND( ny_o, 1, MPI_INTEGER, 0, 5, comm_inter, ierr )
630	CALL MPI_SEND( pdims, 2, MPI_INTEGER, 0, 6, comm_inter, ierr )
631	ENDIF
632
633	CALL MPI_BCAST( nx_a, 1, MPI_INTEGER, 0, comm2d, ierr)
634	CALL MPI_BCAST( ny_a, 1, MPI_INTEGER, 0, comm2d, ierr)
635	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr)
636
637	ENDIF
638
639	ngp_a = ( nx_a+1 + 2 * nbgp ) * ( ny_a+1 + 2 * nbgp )
640	ngp_o = ( nx_o+1 + 2 * nbgp ) * ( ny_o+1 + 2 * nbgp )
641
642	!
643	!-- Determine if the horizontal grid and the number of PEs in ocean and
644	!-- atmosphere is same or not
645	IF ( nx_o == nx_a .AND. ny_o == ny_a .AND. &
646	pdims(1) == pdims_remote(1) .AND. pdims(2) == pdims_remote(2) ) &
647	THEN
648	coupling_topology = 0
649	ELSE
650	coupling_topology = 1
651	ENDIF
652
653	!
654	!-- Determine the target PEs for the exchange between ocean and
655	!-- atmosphere (comm2d)
656	IF ( coupling_topology == 0 ) THEN
657	!
658	!-- In case of identical topologies, every atmosphere PE has exactly one
659	!-- ocean PE counterpart and vice versa
660	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
661	target_id = myid + numprocs
662	ELSE
663	target_id = myid
664	ENDIF
665
666	ELSE
667	!
668	!-- In case of nonequivalent topology in ocean and atmosphere only for
669	!-- PE0 in ocean and PE0 in atmosphere a target_id is needed, since
670	!-- data echxchange between ocean and atmosphere will be done only
671	!-- between these PEs.
672	IF ( myid == 0 ) THEN
673
674	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
675	target_id = numprocs
676	ELSE
677	target_id = 0
678	ENDIF
679
680	ENDIF
681
682	ENDIF
683
684	ENDIF
685
686
687	#endif
688
689	#else
690
691	!
692	!-- Array bounds when running on a single PE (respectively a non-parallel
693	!-- machine)
694	nxl = 0
695	nxr = nx
696	nnx = nxr - nxl + 1
697	nys = 0
698	nyn = ny
699	nny = nyn - nys + 1
700	nzb = 0
701	nzt = nz
702	nnz = nz
703
704	ALLOCATE( hor_index_bounds(4,0:0) )
705	hor_index_bounds(1,0) = nxl
706	hor_index_bounds(2,0) = nxr
707	hor_index_bounds(3,0) = nys
708	hor_index_bounds(4,0) = nyn
709
710	!
711	!-- Array bounds for the pressure solver (in the parallel code, these bounds
712	!-- are the ones for the transposed arrays)
713	nys_x = nys
714	nyn_x = nyn
715	nzb_x = nzb + 1
716	nzt_x = nzt
717
718	nxl_y = nxl
719	nxr_y = nxr
720	nzb_y = nzb + 1
721	nzt_y = nzt
722
723	nxl_z = nxl
724	nxr_z = nxr
725	nys_z = nys
726	nyn_z = nyn
727
728	#endif
729
730	!
731	!-- Calculate number of grid levels necessary for the multigrid poisson solver
732	!-- as well as the gridpoint indices on each level
733	IF ( psolver == 'multigrid' ) THEN
734
735	!
736	!-- First calculate number of possible grid levels for the subdomains
737	mg_levels_x = 1
738	mg_levels_y = 1
739	mg_levels_z = 1
740
741	i = nnx
742	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
743	i = i / 2
744	mg_levels_x = mg_levels_x + 1
745	ENDDO
746
747	j = nny
748	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
749	j = j / 2
750	mg_levels_y = mg_levels_y + 1
751	ENDDO
752
753	k = nz ! do not use nnz because it might be > nz due to transposition
754	! requirements
755	DO WHILE ( MOD( k, 2 ) == 0 .AND. k /= 2 )
756	k = k / 2
757	mg_levels_z = mg_levels_z + 1
758	ENDDO
759
760	maximum_grid_level = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
761
762	!
763	!-- Find out, if the total domain allows more levels. These additional
764	!-- levels are identically processed on all PEs.
765	IF ( numprocs > 1 .AND. mg_switch_to_pe0_level /= -1 ) THEN
766
767	IF ( mg_levels_z > MIN( mg_levels_x, mg_levels_y ) ) THEN
768
769	mg_switch_to_pe0_level_l = maximum_grid_level
770
771	mg_levels_x = 1
772	mg_levels_y = 1
773
774	i = nx+1
775	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
776	i = i / 2
777	mg_levels_x = mg_levels_x + 1
778	ENDDO
779
780	j = ny+1
781	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
782	j = j / 2
783	mg_levels_y = mg_levels_y + 1
784	ENDDO
785
786	maximum_grid_level_l = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
787
788	IF ( maximum_grid_level_l > mg_switch_to_pe0_level_l ) THEN
789	mg_switch_to_pe0_level_l = maximum_grid_level_l - &
790	mg_switch_to_pe0_level_l + 1
791	ELSE
792	mg_switch_to_pe0_level_l = 0
793	ENDIF
794
795	ELSE
796	mg_switch_to_pe0_level_l = 0
797	maximum_grid_level_l = maximum_grid_level
798
799	ENDIF
800
801	!
802	!-- Use switch level calculated above only if it is not pre-defined
803	!-- by user
804	IF ( mg_switch_to_pe0_level == 0 ) THEN
805	IF ( mg_switch_to_pe0_level_l /= 0 ) THEN
806	mg_switch_to_pe0_level = mg_switch_to_pe0_level_l
807	maximum_grid_level = maximum_grid_level_l
808	ENDIF
809
810	ELSE
811	!
812	!-- Check pre-defined value and reset to default, if neccessary
813	IF ( mg_switch_to_pe0_level < mg_switch_to_pe0_level_l .OR. &
814	mg_switch_to_pe0_level >= maximum_grid_level_l ) THEN
815	message_string = 'mg_switch_to_pe0_level ' // &
816	'out of range and reset to default (=0)'
817	CALL message( 'init_pegrid', 'PA0235', 0, 1, 0, 6, 0 )
818	mg_switch_to_pe0_level = 0
819	ELSE
820	!
821	!-- Use the largest number of possible levels anyway and recalculate
822	!-- the switch level to this largest number of possible values
823	maximum_grid_level = maximum_grid_level_l
824
825	ENDIF
826
827	ENDIF
828
829	ENDIF
830
831	ALLOCATE( grid_level_count(maximum_grid_level), &
832	nxl_mg(0:maximum_grid_level), nxr_mg(0:maximum_grid_level), &
833	nyn_mg(0:maximum_grid_level), nys_mg(0:maximum_grid_level), &
834	nzt_mg(0:maximum_grid_level) )
835
836	grid_level_count = 0
837	!
838	!-- Index zero required as dummy due to definition of arrays f2 and p2 in
839	!-- recursive subroutine next_mg_level
840	nxl_mg(0) = 0; nxr_mg(0) = 0; nyn_mg(0) = 0; nys_mg(0) = 0; nzt_mg(0) = 0
841
842	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzt_l = nzt
843
844	DO i = maximum_grid_level, 1 , -1
845
846	IF ( i == mg_switch_to_pe0_level ) THEN
847	#if defined( __parallel ) && ! defined( __check )
848	!
849	!-- Save the grid size of the subdomain at the switch level, because
850	!-- it is needed in poismg.
851	ind(1) = nxl_l; ind(2) = nxr_l
852	ind(3) = nys_l; ind(4) = nyn_l
853	ind(5) = nzt_l
854	ALLOCATE( ind_all(5*numprocs), mg_loc_ind(5,0:numprocs-1) )
855	CALL MPI_ALLGATHER( ind, 5, MPI_INTEGER, ind_all, 5, &
856	MPI_INTEGER, comm2d, ierr )
857	DO j = 0, numprocs-1
858	DO k = 1, 5
859	mg_loc_ind(k,j) = ind_all(k+j*5)
860	ENDDO
861	ENDDO
862	DEALLOCATE( ind_all )
863	!
864	!-- Calculate the grid size of the total domain
865	nxr_l = ( nxr_l-nxl_l+1 ) * pdims(1) - 1
866	nxl_l = 0
867	nyn_l = ( nyn_l-nys_l+1 ) * pdims(2) - 1
868	nys_l = 0
869	!
870	!-- The size of this gathered array must not be larger than the
871	!-- array tend, which is used in the multigrid scheme as a temporary
872	!-- array. Therefore the subdomain size of an PE is calculated and
873	!-- the size of the gathered grid. These values are used in
874	!-- routines pres and poismg
875	subdomain_size = ( nxr - nxl + 2 * nbgp + 1 ) * &
876	( nyn - nys + 2 * nbgp + 1 ) * ( nzt - nzb + 2 )
877	gathered_size = ( nxr_l - nxl_l + 3 ) * ( nyn_l - nys_l + 3 ) * &
878	( nzt_l - nzb + 2 )
879
880	#elif ! defined ( __parallel )
881	message_string = 'multigrid gather/scatter impossible ' // &
882	'in non parallel mode'
883	CALL message( 'init_pegrid', 'PA0237', 1, 2, 0, 6, 0 )
884	#endif
885	ENDIF
886
887	nxl_mg(i) = nxl_l
888	nxr_mg(i) = nxr_l
889	nys_mg(i) = nys_l
890	nyn_mg(i) = nyn_l
891	nzt_mg(i) = nzt_l
892
893	nxl_l = nxl_l / 2
894	nxr_l = nxr_l / 2
895	nys_l = nys_l / 2
896	nyn_l = nyn_l / 2
897	nzt_l = nzt_l / 2
898
899	ENDDO
900
901	!
902	!-- Temporary problem: Currently calculation of maxerror iin routine poismg crashes
903	!-- if grid data are collected on PE0 already on the finest grid level.
904	!-- To be solved later.
905	IF ( maximum_grid_level == mg_switch_to_pe0_level ) THEN
906	message_string = 'grid coarsening on subdomain level cannot be performed'
907	CALL message( 'poismg', 'PA0236', 1, 2, 0, 6, 0 )
908	ENDIF
909
910	ELSE
911
912	maximum_grid_level = 0
913
914	ENDIF
915
916	!
917	!-- Default level 0 tells exchange_horiz that all ghost planes have to be
918	!-- exchanged. grid_level is adjusted in poismg, where only one ghost plane
919	!-- is required.
920	grid_level = 0
921
922	#if defined( __parallel ) && ! defined ( __check )
923	!
924	!-- Gridpoint number for the exchange of ghost points (y-line for 2D-arrays)
925	ngp_y = nyn - nys + 1 + 2 * nbgp
926
927	!
928	!-- Define new MPI derived datatypes for the exchange of ghost points in
929	!-- x- and y-direction for 2D-arrays (line)
930	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_REAL, type_x, &
931	ierr )
932	CALL MPI_TYPE_COMMIT( type_x, ierr )
933	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_INTEGER, &
934	type_x_int, ierr )
935	CALL MPI_TYPE_COMMIT( type_x_int, ierr )
936
937	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_REAL, type_y, ierr )
938	CALL MPI_TYPE_COMMIT( type_y, ierr )
939	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_INTEGER, type_y_int, ierr )
940	CALL MPI_TYPE_COMMIT( type_y_int, ierr )
941
942
943	!
944	!-- Calculate gridpoint numbers for the exchange of ghost points along x
945	!-- (yz-plane for 3D-arrays) and define MPI derived data type(s) for the
946	!-- exchange of ghost points in y-direction (xz-plane).
947	!-- Do these calculations for the model grid and (if necessary) also
948	!-- for the coarser grid levels used in the multigrid method
949	ALLOCATE ( ngp_yz(0:maximum_grid_level), type_xz(0:maximum_grid_level),&
950	type_yz(0:maximum_grid_level) )
951
952	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzb_l = nzb; nzt_l = nzt
953
954	!
955	!-- Discern between the model grid, which needs nbgp ghost points and
956	!-- grid levels for the multigrid scheme. In the latter case only one
957	!-- ghost point is necessary.
958	!-- First definition of MPI-datatypes for exchange of ghost layers on normal
959	!-- grid. The following loop is needed for data exchange in poismg.f90.
960	!
961	!-- Determine number of grid points of yz-layer for exchange
962	ngp_yz(0) = (nzt - nzb + 2) * (nyn - nys + 1 + 2 * nbgp)
963
964	!
965	!-- Define an MPI-datatype for the exchange of left/right boundaries.
966	!-- Although data are contiguous in physical memory (which does not
967	!-- necessarily require an MPI-derived datatype), the data exchange between
968	!-- left and right PE's using the MPI-derived type is 10% faster than without.
969	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2nbgp, nbgp(nzt-nzb+2), ngp_yz(0), &
970	MPI_REAL, type_xz(0), ierr )
971	CALL MPI_TYPE_COMMIT( type_xz(0), ierr )
972
973	CALL MPI_TYPE_VECTOR( nbgp, ngp_yz(0), ngp_yz(0), MPI_REAL, type_yz(0), &
974	ierr )
975	CALL MPI_TYPE_COMMIT( type_yz(0), ierr )
976
977	!
978	!-- Definition of MPI-datatypes for multigrid method (coarser level grids)
979	IF ( psolver == 'multigrid' ) THEN
980	!
981	!-- Definition of MPI-datatyoe as above, but only 1 ghost level is used
982	DO i = maximum_grid_level, 1 , -1
983
984	ngp_yz(i) = (nzt_l - nzb_l + 2) * (nyn_l - nys_l + 3)
985
986	CALL MPI_TYPE_VECTOR( nxr_l-nxl_l+3, nzt_l-nzb_l+2, ngp_yz(i), &
987	MPI_REAL, type_xz(i), ierr )
988	CALL MPI_TYPE_COMMIT( type_xz(i), ierr )
989
990	CALL MPI_TYPE_VECTOR( 1, ngp_yz(i), ngp_yz(i), MPI_REAL, type_yz(i), &
991	ierr )
992	CALL MPI_TYPE_COMMIT( type_yz(i), ierr )
993
994	nxl_l = nxl_l / 2
995	nxr_l = nxr_l / 2
996	nys_l = nys_l / 2
997	nyn_l = nyn_l / 2
998	nzt_l = nzt_l / 2
999
1000	ENDDO
1001
1002	ENDIF
1003	#endif
1004
1005	#if defined( __parallel ) && ! defined ( __check )
1006	!
1007	!-- Setting of flags for inflow/outflow conditions in case of non-cyclic
1008	!-- horizontal boundary conditions.
1009	IF ( pleft == MPI_PROC_NULL ) THEN
1010	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1011	inflow_l = .TRUE.
1012	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1013	outflow_l = .TRUE.
1014	ENDIF
1015	ENDIF
1016
1017	IF ( pright == MPI_PROC_NULL ) THEN
1018	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1019	outflow_r = .TRUE.
1020	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1021	inflow_r = .TRUE.
1022	ENDIF
1023	ENDIF
1024
1025	IF ( psouth == MPI_PROC_NULL ) THEN
1026	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1027	outflow_s = .TRUE.
1028	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1029	inflow_s = .TRUE.
1030	ENDIF
1031	ENDIF
1032
1033	IF ( pnorth == MPI_PROC_NULL ) THEN
1034	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1035	inflow_n = .TRUE.
1036	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1037	outflow_n = .TRUE.
1038	ENDIF
1039	ENDIF
1040
1041	!
1042	!-- Broadcast the id of the inflow PE
1043	IF ( inflow_l ) THEN
1044	id_inflow_l = myidx
1045	ELSE
1046	id_inflow_l = 0
1047	ENDIF
1048	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1049	CALL MPI_ALLREDUCE( id_inflow_l, id_inflow, 1, MPI_INTEGER, MPI_SUM, &
1050	comm1dx, ierr )
1051
1052	!
1053	!-- Broadcast the id of the recycling plane
1054	!-- WARNING: needs to be adjusted in case of inflows other than from left side!
1055	IF ( NINT( recycling_width / dx ) >= nxl .AND. &
1056	NINT( recycling_width / dx ) <= nxr ) THEN
1057	id_recycling_l = myidx
1058	ELSE
1059	id_recycling_l = 0
1060	ENDIF
1061	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1062	CALL MPI_ALLREDUCE( id_recycling_l, id_recycling, 1, MPI_INTEGER, MPI_SUM, &
1063	comm1dx, ierr )
1064
1065	#elif ! defined ( __parallel )
1066	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1067	inflow_l = .TRUE.
1068	outflow_r = .TRUE.
1069	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1070	outflow_l = .TRUE.
1071	inflow_r = .TRUE.
1072	ENDIF
1073
1074	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1075	inflow_n = .TRUE.
1076	outflow_s = .TRUE.
1077	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1078	outflow_n = .TRUE.
1079	inflow_s = .TRUE.
1080	ENDIF
1081	#endif
1082
1083	!
1084	!-- At the inflow or outflow, u or v, respectively, have to be calculated for
1085	!-- one more grid point.
1086	IF ( inflow_l .OR. outflow_l ) THEN
1087	nxlu = nxl + 1
1088	ELSE
1089	nxlu = nxl
1090	ENDIF
1091	IF ( inflow_s .OR. outflow_s ) THEN
1092	nysv = nys + 1
1093	ELSE
1094	nysv = nys
1095	ENDIF
1096
1097	!
1098	!-- Allocate wall flag arrays used in the multigrid solver
1099	IF ( psolver == 'multigrid' ) THEN
1100
1101	DO i = maximum_grid_level, 1, -1
1102
1103	SELECT CASE ( i )
1104
1105	CASE ( 1 )
1106	ALLOCATE( wall_flags_1(nzb:nzt_mg(i)+1, &
1107	nys_mg(i)-1:nyn_mg(i)+1, &
1108	nxl_mg(i)-1:nxr_mg(i)+1) )
1109
1110	CASE ( 2 )
1111	ALLOCATE( wall_flags_2(nzb:nzt_mg(i)+1, &
1112	nys_mg(i)-1:nyn_mg(i)+1, &
1113	nxl_mg(i)-1:nxr_mg(i)+1) )
1114
1115	CASE ( 3 )
1116	ALLOCATE( wall_flags_3(nzb:nzt_mg(i)+1, &
1117	nys_mg(i)-1:nyn_mg(i)+1, &
1118	nxl_mg(i)-1:nxr_mg(i)+1) )
1119
1120	CASE ( 4 )
1121	ALLOCATE( wall_flags_4(nzb:nzt_mg(i)+1, &
1122	nys_mg(i)-1:nyn_mg(i)+1, &
1123	nxl_mg(i)-1:nxr_mg(i)+1) )
1124
1125	CASE ( 5 )
1126	ALLOCATE( wall_flags_5(nzb:nzt_mg(i)+1, &
1127	nys_mg(i)-1:nyn_mg(i)+1, &
1128	nxl_mg(i)-1:nxr_mg(i)+1) )
1129
1130	CASE ( 6 )
1131	ALLOCATE( wall_flags_6(nzb:nzt_mg(i)+1, &
1132	nys_mg(i)-1:nyn_mg(i)+1, &
1133	nxl_mg(i)-1:nxr_mg(i)+1) )
1134
1135	CASE ( 7 )
1136	ALLOCATE( wall_flags_7(nzb:nzt_mg(i)+1, &
1137	nys_mg(i)-1:nyn_mg(i)+1, &
1138	nxl_mg(i)-1:nxr_mg(i)+1) )
1139
1140	CASE ( 8 )
1141	ALLOCATE( wall_flags_8(nzb:nzt_mg(i)+1, &
1142	nys_mg(i)-1:nyn_mg(i)+1, &
1143	nxl_mg(i)-1:nxr_mg(i)+1) )
1144
1145	CASE ( 9 )
1146	ALLOCATE( wall_flags_9(nzb:nzt_mg(i)+1, &
1147	nys_mg(i)-1:nyn_mg(i)+1, &
1148	nxl_mg(i)-1:nxr_mg(i)+1) )
1149
1150	CASE ( 10 )
1151	ALLOCATE( wall_flags_10(nzb:nzt_mg(i)+1, &
1152	nys_mg(i)-1:nyn_mg(i)+1, &
1153	nxl_mg(i)-1:nxr_mg(i)+1) )
1154
1155	CASE DEFAULT
1156	message_string = 'more than 10 multigrid levels'
1157	CALL message( 'init_pegrid', 'PA0238', 1, 2, 0, 6, 0 )
1158
1159	END SELECT
1160
1161	ENDDO
1162
1163	ENDIF
1164
1165	!
1166	!-- Calculate the number of groups into which parallel I/O is split.
1167	!-- The default for files which are opened by all PEs (or where each
1168	!-- PE opens his own independent file) is, that all PEs are doing input/output
1169	!-- in parallel at the same time. This might cause performance or even more
1170	!-- severe problems depending on the configuration of the underlying file
1171	!-- system.
1172	!-- First, set the default:
1173	IF ( maximum_parallel_io_streams == -1 .OR. &
1174	maximum_parallel_io_streams > numprocs ) THEN
1175	maximum_parallel_io_streams = numprocs
1176	ENDIF
1177
1178	!
1179	!-- Now calculate the number of io_blocks and the io_group to which the
1180	!-- respective PE belongs. I/O of the groups is done in serial, but in parallel
1181	!-- for all PEs belonging to the same group. A preliminary setting with myid
1182	!-- based on MPI_COMM_WORLD has been done in parin.
1183	io_blocks = numprocs / maximum_parallel_io_streams
1184	io_group = MOD( myid+1, io_blocks )
1185
1186
1187	END SUBROUTINE init_pegrid

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