Home

Context Navigation

source: palm/trunk/SOURCE/init_pegrid.f90 @ 1322

Last change on this file since 1322 was 1322, checked in by raasch, 10 years ago
REAL functions and a lot of REAL constants provided with KIND-attribute, some small bugfixes
Property svn:keywords set to `Id`
File size: 40.5 KB

Line
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	! REAL functions provided with KIND-attribute
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: init_pegrid.f90 1322 2014-03-20 16:38:49Z raasch $
27	!
28	! 1320 2014-03-20 08:40:49Z raasch
29	! ONLY-attribute added to USE-statements,
30	! kind-parameters added to all INTEGER and REAL declaration statements,
31	! kinds are defined in new module kinds,
32	! revision history before 2012 removed,
33	! comment fields (!:) to be used for variable explanations added to
34	! all variable declaration statements
35	!
36	! 1304 2014-03-12 10:29:42Z raasch
37	! bugfix: single core MPI runs missed some settings of transpose indices
38	!
39	! 1212 2013-08-15 08:46:27Z raasch
40	! error message for poisfft_hybrid removed
41	!
42	! 1159 2013-05-21 11:58:22Z fricke
43	! dirichlet/neumann and neumann/dirichlet removed
44	!
45	! 1139 2013-04-18 07:25:03Z raasch
46	! bugfix for calculating the id of the PE carrying the recycling plane
47	!
48	! 1111 2013-03-08 23:54:10Z raasch
49	! initialization of poisfft moved to module poisfft
50	!
51	! 1092 2013-02-02 11:24:22Z raasch
52	! unused variables removed
53	!
54	! 1056 2012-11-16 15:28:04Z raasch
55	! Indices for arrays n.._mg start from zero due to definition of arrays f2 and
56	! p2 as automatic arrays in recursive subroutine next_mg_level
57	!
58	! 1041 2012-11-06 02:36:29Z raasch
59	! a 2d virtual processor topology is used by default for all machines
60	!
61	! 1036 2012-10-22 13:43:42Z raasch
62	! code put under GPL (PALM 3.9)
63	!
64	! 1003 2012-09-14 14:35:53Z raasch
65	! subdomains must have identical size (grid matching = "match" removed)
66	!
67	! 1001 2012-09-13 14:08:46Z raasch
68	! all actions concerning upstream-spline-method removed
69	!
70	! 978 2012-08-09 08:28:32Z fricke
71	! dirichlet/neumann and neumann/dirichlet added
72	! nxlu and nysv are also calculated for inflow boundary
73	!
74	! 809 2012-01-30 13:32:58Z maronga
75	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
76	!
77	! 807 2012-01-25 11:53:51Z maronga
78	! New cpp directive "__check" implemented which is used by check_namelist_files
79	!
80	! Revision 1.1 1997/07/24 11:15:09 raasch
81	! Initial revision
82	!
83	!
84	! Description:
85	! ------------
86	! Determination of the virtual processor topology (if not prescribed by the
87	! user)and computation of the grid point number and array bounds of the local
88	! domains.
89	!------------------------------------------------------------------------------!
90
91	USE control_parameters, &
92	ONLY: bc_lr, bc_ns, coupling_mode, coupling_topology, dt_dosp, &
93	gathered_size, grid_level, grid_level_count, host, inflow_l, &
94	inflow_n, inflow_r, inflow_s, io_blocks, io_group, &
95	maximum_grid_level, maximum_parallel_io_streams, message_string,&
96	mg_switch_to_pe0_level, momentum_advec, psolver, outflow_l, &
97	outflow_n, outflow_r, outflow_s, recycling_width, scalar_advec, &
98	subdomain_size
99
100	USE grid_variables, &
101	ONLY: dx
102
103	USE indices, &
104	ONLY: mg_loc_ind, nbgp, nnx, nny, nnz, nx, nx_a, nx_o, nxl, nxl_mg, &
105	nxlu, nxr, nxr_mg, ny, ny_a, ny_o, nyn, nyn_mg, nys, nys_mg, &
106	nysv, nz, nzb, nzt, nzt_mg, wall_flags_1, wall_flags_2, &
107	wall_flags_3, wall_flags_4, wall_flags_5, wall_flags_6, &
108	wall_flags_7, wall_flags_8, wall_flags_9, wall_flags_10
109
110	USE kinds
111
112	USE pegrid
113
114	USE transpose_indices, &
115	ONLY: nxl_y, nxl_yd, nxl_z, nxr_y, nxr_yd, nxr_z, nyn_x, nyn_z, nys_x,&
116	nys_z, nzb_x, nzb_y, nzb_yd, nzt_x, nzt_yd, nzt_y
117
118	IMPLICIT NONE
119
120	INTEGER(iwp) :: i !:
121	INTEGER(iwp) :: id_inflow_l !:
122	INTEGER(iwp) :: id_recycling_l !:
123	INTEGER(iwp) :: ind(5) !:
124	INTEGER(iwp) :: j !:
125	INTEGER(iwp) :: k !:
126	INTEGER(iwp) :: maximum_grid_level_l !:
127	INTEGER(iwp) :: mg_levels_x !:
128	INTEGER(iwp) :: mg_levels_y !:
129	INTEGER(iwp) :: mg_levels_z !:
130	INTEGER(iwp) :: mg_switch_to_pe0_level_l !:
131	INTEGER(iwp) :: nnx_y !:
132	INTEGER(iwp) :: nnx_z !:
133	INTEGER(iwp) :: nny_x !:
134	INTEGER(iwp) :: nny_z !:
135	INTEGER(iwp) :: nnz_x !:
136	INTEGER(iwp) :: nnz_y !:
137	INTEGER(iwp) :: numproc_sqr !:
138	INTEGER(iwp) :: nxl_l !:
139	INTEGER(iwp) :: nxr_l !:
140	INTEGER(iwp) :: nyn_l !:
141	INTEGER(iwp) :: nys_l !:
142	INTEGER(iwp) :: nzb_l !:
143	INTEGER(iwp) :: nzt_l !:
144	INTEGER(iwp) :: omp_get_num_threads !:
145
146	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: ind_all !:
147	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxlf !:
148	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxrf !:
149	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nynf !:
150	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nysf !:
151
152	INTEGER(iwp), DIMENSION(2) :: pdims_remote !:
153
154	#if defined( __mpi2 )
155	LOGICAL :: found !:
156	#endif
157
158	!
159	!-- Get the number of OpenMP threads
160	!$OMP PARALLEL
161	#if defined( __intel_openmp_bug )
162	threads_per_task = omp_get_num_threads()
163	#else
164	!$ threads_per_task = omp_get_num_threads()
165	#endif
166	!$OMP END PARALLEL
167
168
169	#if defined( __parallel )
170
171	!
172	!-- Determine the processor topology or check it, if prescribed by the user
173	IF ( npex == -1 .AND. npey == -1 ) THEN
174
175	!
176	!-- Automatic determination of the topology
177	numproc_sqr = SQRT( REAL( numprocs, KIND=wp ) )
178	pdims(1) = MAX( numproc_sqr , 1 )
179	DO WHILE ( MOD( numprocs , pdims(1) ) /= 0 )
180	pdims(1) = pdims(1) - 1
181	ENDDO
182	pdims(2) = numprocs / pdims(1)
183
184	ELSEIF ( npex /= -1 .AND. npey /= -1 ) THEN
185
186	!
187	!-- Prescribed by user. Number of processors on the prescribed topology
188	!-- must be equal to the number of PEs available to the job
189	IF ( ( npex * npey ) /= numprocs ) THEN
190	WRITE( message_string, * ) 'number of PEs of the prescribed ', &
191	'topology (', npex*npey,') does not match & the number of ', &
192	'PEs available to the job (', numprocs, ')'
193	CALL message( 'init_pegrid', 'PA0221', 1, 2, 0, 6, 0 )
194	ENDIF
195	pdims(1) = npex
196	pdims(2) = npey
197
198	ELSE
199	!
200	!-- If the processor topology is prescribed by the user, the number of
201	!-- PEs must be given in both directions
202	message_string = 'if the processor topology is prescribed by the, ' // &
203	' user& both values of "npex" and "npey" must be given ' // &
204	'in the &NAMELIST-parameter file'
205	CALL message( 'init_pegrid', 'PA0222', 1, 2, 0, 6, 0 )
206
207	ENDIF
208
209	!
210	!-- For communication speedup, set barriers in front of collective
211	!-- communications by default on SGI-type systems
212	IF ( host(3:5) == 'sgi' ) collective_wait = .TRUE.
213
214	!
215	!-- If necessary, set horizontal boundary conditions to non-cyclic
216	IF ( bc_lr /= 'cyclic' ) cyclic(1) = .FALSE.
217	IF ( bc_ns /= 'cyclic' ) cyclic(2) = .FALSE.
218
219
220	#if ! defined( __check)
221	!
222	!-- Create the virtual processor grid
223	CALL MPI_CART_CREATE( comm_palm, ndim, pdims, cyclic, reorder, &
224	comm2d, ierr )
225	CALL MPI_COMM_RANK( comm2d, myid, ierr )
226	WRITE (myid_char,'(''_'',I4.4)') myid
227
228	CALL MPI_CART_COORDS( comm2d, myid, ndim, pcoord, ierr )
229	CALL MPI_CART_SHIFT( comm2d, 0, 1, pleft, pright, ierr )
230	CALL MPI_CART_SHIFT( comm2d, 1, 1, psouth, pnorth, ierr )
231
232	!
233	!-- Determine sub-topologies for transpositions
234	!-- Transposition from z to x:
235	remain_dims(1) = .TRUE.
236	remain_dims(2) = .FALSE.
237	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dx, ierr )
238	CALL MPI_COMM_RANK( comm1dx, myidx, ierr )
239	!
240	!-- Transposition from x to y
241	remain_dims(1) = .FALSE.
242	remain_dims(2) = .TRUE.
243	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dy, ierr )
244	CALL MPI_COMM_RANK( comm1dy, myidy, ierr )
245
246	#endif
247
248	!
249	!-- Calculate array bounds along x-direction for every PE.
250	ALLOCATE( nxlf(0:pdims(1)-1), nxrf(0:pdims(1)-1), nynf(0:pdims(2)-1), &
251	nysf(0:pdims(2)-1) )
252
253	IF ( MOD( nx+1 , pdims(1) ) /= 0 ) THEN
254	WRITE( message_string, * ) 'x-direction: gridpoint number (',nx+1,') ',&
255	'is not an& integral divisor of the number ', &
256	'processors (', pdims(1),')'
257	CALL message( 'init_pegrid', 'PA0225', 1, 2, 0, 6, 0 )
258	ELSE
259	nnx = ( nx + 1 ) / pdims(1)
260	IF ( nnx*pdims(1) - ( nx + 1) > nnx ) THEN
261	WRITE( message_string, * ) 'x-direction: nx does not match the', &
262	'requirements given by the number of PEs &used', &
263	'& please use nx = ', nx - ( pdims(1) - ( nnx*pdims(1) &
264	- ( nx + 1 ) ) ), ' instead of nx =', nx
265	CALL message( 'init_pegrid', 'PA0226', 1, 2, 0, 6, 0 )
266	ENDIF
267	ENDIF
268
269	!
270	!-- Left and right array bounds, number of gridpoints
271	DO i = 0, pdims(1)-1
272	nxlf(i) = i * nnx
273	nxrf(i) = ( i + 1 ) * nnx - 1
274	ENDDO
275
276	!
277	!-- Calculate array bounds in y-direction for every PE.
278	IF ( MOD( ny+1 , pdims(2) ) /= 0 ) THEN
279	WRITE( message_string, * ) 'y-direction: gridpoint number (',ny+1,') ', &
280	'is not an& integral divisor of the number of', &
281	'processors (', pdims(2),')'
282	CALL message( 'init_pegrid', 'PA0227', 1, 2, 0, 6, 0 )
283	ELSE
284	nny = ( ny + 1 ) / pdims(2)
285	IF ( nny*pdims(2) - ( ny + 1) > nny ) THEN
286	WRITE( message_string, * ) 'y-direction: ny does not match the', &
287	'requirements given by the number of PEs &used ', &
288	'& please use ny = ', ny - ( pdims(2) - ( nnx*pdims(2) &
289	- ( ny + 1 ) ) ), ' instead of ny =', ny
290	CALL message( 'init_pegrid', 'PA0228', 1, 2, 0, 6, 0 )
291	ENDIF
292	ENDIF
293
294	!
295	!-- South and north array bounds
296	DO j = 0, pdims(2)-1
297	nysf(j) = j * nny
298	nynf(j) = ( j + 1 ) * nny - 1
299	ENDDO
300
301	!
302	!-- Local array bounds of the respective PEs
303	nxl = nxlf(pcoord(1))
304	nxr = nxrf(pcoord(1))
305	nys = nysf(pcoord(2))
306	nyn = nynf(pcoord(2))
307	nzb = 0
308	nzt = nz
309	nnz = nz
310
311	!
312	!-- Set switches to define if the PE is situated at the border of the virtual
313	!-- processor grid
314	IF ( nxl == 0 ) left_border_pe = .TRUE.
315	IF ( nxr == nx ) right_border_pe = .TRUE.
316	IF ( nys == 0 ) south_border_pe = .TRUE.
317	IF ( nyn == ny ) north_border_pe = .TRUE.
318
319	!
320	!-- Calculate array bounds and gridpoint numbers for the transposed arrays
321	!-- (needed in the pressure solver)
322	!-- For the transposed arrays, cyclic boundaries as well as top and bottom
323	!-- boundaries are omitted, because they are obstructive to the transposition
324
325	!
326	!-- 1. transposition z --> x
327	!-- This transposition is not neccessary in case of a 1d-decomposition along x
328	nys_x = nys
329	nyn_x = nyn
330	nny_x = nny
331	nnz_x = nz / pdims(1)
332	nzb_x = 1 + myidx * nnz_x
333	nzt_x = ( myidx + 1 ) * nnz_x
334	sendrecvcount_zx = nnx * nny * nnz_x
335
336	IF ( pdims(2) /= 1 ) THEN
337	IF ( MOD( nz , pdims(1) ) /= 0 ) THEN
338	WRITE( message_string, * ) 'transposition z --> x:', &
339	'&nz=',nz,' is not an integral divisior of pdims(1)=', &
340	pdims(1)
341	CALL message( 'init_pegrid', 'PA0230', 1, 2, 0, 6, 0 )
342	ENDIF
343	ENDIF
344
345	!
346	!-- 2. transposition x --> y
347	nnz_y = nnz_x
348	nzb_y = nzb_x
349	nzt_y = nzt_x
350	IF ( MOD( nx+1 , pdims(2) ) /= 0 ) THEN
351	WRITE( message_string, * ) 'transposition x --> y:', &
352	'&nx+1=',nx+1,' is not an integral divisor of ',&
353	'pdims(2)=',pdims(2)
354	CALL message( 'init_pegrid', 'PA0231', 1, 2, 0, 6, 0 )
355	ENDIF
356	nnx_y = (nx+1) / pdims(2)
357	nxl_y = myidy * nnx_y
358	nxr_y = ( myidy + 1 ) * nnx_y - 1
359	sendrecvcount_xy = nnx_y * nny_x * nnz_y
360
361	!
362	!-- 3. transposition y --> z (ELSE: x --> y in case of 1D-decomposition
363	!-- along x)
364	nnx_z = nnx_y
365	nxl_z = nxl_y
366	nxr_z = nxr_y
367	nny_z = (ny+1) / pdims(1)
368	nys_z = myidx * nny_z
369	nyn_z = ( myidx + 1 ) * nny_z - 1
370	sendrecvcount_yz = nnx_y * nny_z * nnz_y
371
372	IF ( pdims(2) /= 1 ) THEN
373	!
374	!-- y --> z
375	!-- This transposition is not neccessary in case of a 1d-decomposition
376	!-- along x, except that the uptream-spline method is switched on
377	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
378	WRITE( message_string, * ) 'transposition y --> z:', &
379	'& ny+1=',ny+1,' is not an integral divisor of ',&
380	'pdims(1)=',pdims(1)
381	CALL message( 'init_pegrid', 'PA0232', 1, 2, 0, 6, 0 )
382	ENDIF
383
384	ELSE
385	!
386	!-- x --> y. This condition must be fulfilled for a 1D-decomposition along x
387	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
388	WRITE( message_string, * ) 'transposition x --> y:', &
389	'& ny+1=',ny+1,' is not an integral divisor of ',&
390	'pdims(1)=',pdims(1)
391	CALL message( 'init_pegrid', 'PA0233', 1, 2, 0, 6, 0 )
392	ENDIF
393
394	ENDIF
395
396	!
397	!-- Indices for direct transpositions z --> y (used for calculating spectra)
398	IF ( dt_dosp /= 9999999.9 ) THEN
399	IF ( MOD( nz, pdims(2) ) /= 0 ) THEN
400	WRITE( message_string, * ) 'direct transposition z --> y (needed ', &
401	'for spectra):& nz=',nz,' is not an integral divisor of ',&
402	'pdims(2)=',pdims(2)
403	CALL message( 'init_pegrid', 'PA0234', 1, 2, 0, 6, 0 )
404	ELSE
405	nxl_yd = nxl
406	nxr_yd = nxr
407	nzb_yd = 1 + myidy * ( nz / pdims(2) )
408	nzt_yd = ( myidy + 1 ) * ( nz / pdims(2) )
409	sendrecvcount_zyd = nnx * nny * ( nz / pdims(2) )
410	ENDIF
411	ENDIF
412
413	!
414	!-- Indices for direct transpositions y --> x (they are only possible in case
415	!-- of a 1d-decomposition along x)
416	IF ( pdims(2) == 1 ) THEN
417	nny_x = nny / pdims(1)
418	nys_x = myid * nny_x
419	nyn_x = ( myid + 1 ) * nny_x - 1
420	nzb_x = 1
421	nzt_x = nz
422	sendrecvcount_xy = nnx * nny_x * nz
423	ENDIF
424
425	!
426	!-- Indices for direct transpositions x --> y (they are only possible in case
427	!-- of a 1d-decomposition along y)
428	IF ( pdims(1) == 1 ) THEN
429	nnx_y = nnx / pdims(2)
430	nxl_y = myid * nnx_y
431	nxr_y = ( myid + 1 ) * nnx_y - 1
432	nzb_y = 1
433	nzt_y = nz
434	sendrecvcount_xy = nnx_y * nny * nz
435	ENDIF
436
437	!
438	!-- Arrays for storing the array bounds are needed any more
439	DEALLOCATE( nxlf , nxrf , nynf , nysf )
440
441
442	#if ! defined( __check)
443	!
444	!-- Collect index bounds from other PEs (to be written to restart file later)
445	ALLOCATE( hor_index_bounds(4,0:numprocs-1) )
446
447	IF ( myid == 0 ) THEN
448
449	hor_index_bounds(1,0) = nxl
450	hor_index_bounds(2,0) = nxr
451	hor_index_bounds(3,0) = nys
452	hor_index_bounds(4,0) = nyn
453
454	!
455	!-- Receive data from all other PEs
456	DO i = 1, numprocs-1
457	CALL MPI_RECV( ibuf, 4, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
458	ierr )
459	hor_index_bounds(:,i) = ibuf(1:4)
460	ENDDO
461
462	ELSE
463	!
464	!-- Send index bounds to PE0
465	ibuf(1) = nxl
466	ibuf(2) = nxr
467	ibuf(3) = nys
468	ibuf(4) = nyn
469	CALL MPI_SEND( ibuf, 4, MPI_INTEGER, 0, myid, comm2d, ierr )
470
471	ENDIF
472
473	#endif
474
475	#if defined( __print )
476	!
477	!-- Control output
478	IF ( myid == 0 ) THEN
479	PRINT, ' processor topology *'
480	PRINT*, ' '
481	PRINT*, 'myid pcoord left right south north idx idy nxl: nxr',&
482	&' nys: nyn'
483	PRINT*, '------------------------------------------------------------',&
484	&'-----------'
485	WRITE (*,1000) 0, pcoord(1), pcoord(2), pleft, pright, psouth, pnorth, &
486	myidx, myidy, nxl, nxr, nys, nyn
487	1000 FORMAT (I4,2X,'(',I3,',',I3,')',3X,I4,2X,I4,3X,I4,2X,I4,2X,I3,1X,I3, &
488	2(2X,I4,':',I4))
489
490	!
491	!-- Receive data from the other PEs
492	DO i = 1,numprocs-1
493	CALL MPI_RECV( ibuf, 12, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
494	ierr )
495	WRITE (*,1000) i, ( ibuf(j) , j = 1,12 )
496	ENDDO
497	ELSE
498
499	!
500	!-- Send data to PE0
501	ibuf(1) = pcoord(1); ibuf(2) = pcoord(2); ibuf(3) = pleft
502	ibuf(4) = pright; ibuf(5) = psouth; ibuf(6) = pnorth; ibuf(7) = myidx
503	ibuf(8) = myidy; ibuf(9) = nxl; ibuf(10) = nxr; ibuf(11) = nys
504	ibuf(12) = nyn
505	CALL MPI_SEND( ibuf, 12, MPI_INTEGER, 0, myid, comm2d, ierr )
506	ENDIF
507	#endif
508
509	#if defined( __parallel ) && ! defined( __check)
510	#if defined( __mpi2 )
511	!
512	!-- In case of coupled runs, get the port name on PE0 of the atmosphere model
513	!-- and pass it to PE0 of the ocean model
514	IF ( myid == 0 ) THEN
515
516	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
517
518	CALL MPI_OPEN_PORT( MPI_INFO_NULL, port_name, ierr )
519
520	CALL MPI_PUBLISH_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, &
521	ierr )
522
523	!
524	!-- Write a flag file for the ocean model and the other atmosphere
525	!-- processes.
526	!-- There seems to be a bug in MPICH2 which causes hanging processes
527	!-- in case that execution of LOOKUP_NAME is continued too early
528	!-- (i.e. before the port has been created)
529	OPEN( 90, FILE='COUPLING_PORT_OPENED', FORM='FORMATTED' )
530	WRITE ( 90, '(''TRUE'')' )
531	CLOSE ( 90 )
532
533	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
534
535	!
536	!-- Continue only if the atmosphere model has created the port.
537	!-- There seems to be a bug in MPICH2 which causes hanging processes
538	!-- in case that execution of LOOKUP_NAME is continued too early
539	!-- (i.e. before the port has been created)
540	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
541	DO WHILE ( .NOT. found )
542	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
543	ENDDO
544
545	CALL MPI_LOOKUP_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, ierr )
546
547	ENDIF
548
549	ENDIF
550
551	!
552	!-- In case of coupled runs, establish the connection between the atmosphere
553	!-- and the ocean model and define the intercommunicator (comm_inter)
554	CALL MPI_BARRIER( comm2d, ierr )
555	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
556
557	CALL MPI_COMM_ACCEPT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
558	comm_inter, ierr )
559	coupling_mode_remote = 'ocean_to_atmosphere'
560
561	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
562
563	CALL MPI_COMM_CONNECT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
564	comm_inter, ierr )
565	coupling_mode_remote = 'atmosphere_to_ocean'
566
567	ENDIF
568	#endif
569
570	!
571	!-- Determine the number of ghost point layers
572	IF ( scalar_advec == 'ws-scheme' .OR. momentum_advec == 'ws-scheme' ) THEN
573	nbgp = 3
574	ELSE
575	nbgp = 1
576	ENDIF
577
578	!
579	!-- Create a new MPI derived datatype for the exchange of surface (xy) data,
580	!-- which is needed for coupled atmosphere-ocean runs.
581	!-- First, calculate number of grid points of an xy-plane.
582	ngp_xy = ( nxr - nxl + 1 + 2 * nbgp ) * ( nyn - nys + 1 + 2 * nbgp )
583	CALL MPI_TYPE_VECTOR( ngp_xy, 1, nzt-nzb+2, MPI_REAL, type_xy, ierr )
584	CALL MPI_TYPE_COMMIT( type_xy, ierr )
585
586	IF ( TRIM( coupling_mode ) /= 'uncoupled' ) THEN
587
588	!
589	!-- Pass the number of grid points of the atmosphere model to
590	!-- the ocean model and vice versa
591	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
592
593	nx_a = nx
594	ny_a = ny
595
596	IF ( myid == 0 ) THEN
597
598	CALL MPI_SEND( nx_a, 1, MPI_INTEGER, numprocs, 1, comm_inter, &
599	ierr )
600	CALL MPI_SEND( ny_a, 1, MPI_INTEGER, numprocs, 2, comm_inter, &
601	ierr )
602	CALL MPI_SEND( pdims, 2, MPI_INTEGER, numprocs, 3, comm_inter, &
603	ierr )
604	CALL MPI_RECV( nx_o, 1, MPI_INTEGER, numprocs, 4, comm_inter, &
605	status, ierr )
606	CALL MPI_RECV( ny_o, 1, MPI_INTEGER, numprocs, 5, comm_inter, &
607	status, ierr )
608	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, numprocs, 6, &
609	comm_inter, status, ierr )
610	ENDIF
611
612	CALL MPI_BCAST( nx_o, 1, MPI_INTEGER, 0, comm2d, ierr )
613	CALL MPI_BCAST( ny_o, 1, MPI_INTEGER, 0, comm2d, ierr )
614	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr )
615
616	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
617
618	nx_o = nx
619	ny_o = ny
620
621	IF ( myid == 0 ) THEN
622
623	CALL MPI_RECV( nx_a, 1, MPI_INTEGER, 0, 1, comm_inter, status, &
624	ierr )
625	CALL MPI_RECV( ny_a, 1, MPI_INTEGER, 0, 2, comm_inter, status, &
626	ierr )
627	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, 0, 3, comm_inter, &
628	status, ierr )
629	CALL MPI_SEND( nx_o, 1, MPI_INTEGER, 0, 4, comm_inter, ierr )
630	CALL MPI_SEND( ny_o, 1, MPI_INTEGER, 0, 5, comm_inter, ierr )
631	CALL MPI_SEND( pdims, 2, MPI_INTEGER, 0, 6, comm_inter, ierr )
632	ENDIF
633
634	CALL MPI_BCAST( nx_a, 1, MPI_INTEGER, 0, comm2d, ierr)
635	CALL MPI_BCAST( ny_a, 1, MPI_INTEGER, 0, comm2d, ierr)
636	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr)
637
638	ENDIF
639
640	ngp_a = ( nx_a+1 + 2 * nbgp ) * ( ny_a+1 + 2 * nbgp )
641	ngp_o = ( nx_o+1 + 2 * nbgp ) * ( ny_o+1 + 2 * nbgp )
642
643	!
644	!-- Determine if the horizontal grid and the number of PEs in ocean and
645	!-- atmosphere is same or not
646	IF ( nx_o == nx_a .AND. ny_o == ny_a .AND. &
647	pdims(1) == pdims_remote(1) .AND. pdims(2) == pdims_remote(2) ) &
648	THEN
649	coupling_topology = 0
650	ELSE
651	coupling_topology = 1
652	ENDIF
653
654	!
655	!-- Determine the target PEs for the exchange between ocean and
656	!-- atmosphere (comm2d)
657	IF ( coupling_topology == 0 ) THEN
658	!
659	!-- In case of identical topologies, every atmosphere PE has exactly one
660	!-- ocean PE counterpart and vice versa
661	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
662	target_id = myid + numprocs
663	ELSE
664	target_id = myid
665	ENDIF
666
667	ELSE
668	!
669	!-- In case of nonequivalent topology in ocean and atmosphere only for
670	!-- PE0 in ocean and PE0 in atmosphere a target_id is needed, since
671	!-- data echxchange between ocean and atmosphere will be done only
672	!-- between these PEs.
673	IF ( myid == 0 ) THEN
674
675	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
676	target_id = numprocs
677	ELSE
678	target_id = 0
679	ENDIF
680
681	ENDIF
682
683	ENDIF
684
685	ENDIF
686
687
688	#endif
689
690	#else
691
692	!
693	!-- Array bounds when running on a single PE (respectively a non-parallel
694	!-- machine)
695	nxl = 0
696	nxr = nx
697	nnx = nxr - nxl + 1
698	nys = 0
699	nyn = ny
700	nny = nyn - nys + 1
701	nzb = 0
702	nzt = nz
703	nnz = nz
704
705	ALLOCATE( hor_index_bounds(4,0:0) )
706	hor_index_bounds(1,0) = nxl
707	hor_index_bounds(2,0) = nxr
708	hor_index_bounds(3,0) = nys
709	hor_index_bounds(4,0) = nyn
710
711	!
712	!-- Array bounds for the pressure solver (in the parallel code, these bounds
713	!-- are the ones for the transposed arrays)
714	nys_x = nys
715	nyn_x = nyn
716	nzb_x = nzb + 1
717	nzt_x = nzt
718
719	nxl_y = nxl
720	nxr_y = nxr
721	nzb_y = nzb + 1
722	nzt_y = nzt
723
724	nxl_z = nxl
725	nxr_z = nxr
726	nys_z = nys
727	nyn_z = nyn
728
729	#endif
730
731	!
732	!-- Calculate number of grid levels necessary for the multigrid poisson solver
733	!-- as well as the gridpoint indices on each level
734	IF ( psolver == 'multigrid' ) THEN
735
736	!
737	!-- First calculate number of possible grid levels for the subdomains
738	mg_levels_x = 1
739	mg_levels_y = 1
740	mg_levels_z = 1
741
742	i = nnx
743	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
744	i = i / 2
745	mg_levels_x = mg_levels_x + 1
746	ENDDO
747
748	j = nny
749	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
750	j = j / 2
751	mg_levels_y = mg_levels_y + 1
752	ENDDO
753
754	k = nz ! do not use nnz because it might be > nz due to transposition
755	! requirements
756	DO WHILE ( MOD( k, 2 ) == 0 .AND. k /= 2 )
757	k = k / 2
758	mg_levels_z = mg_levels_z + 1
759	ENDDO
760
761	maximum_grid_level = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
762
763	!
764	!-- Find out, if the total domain allows more levels. These additional
765	!-- levels are identically processed on all PEs.
766	IF ( numprocs > 1 .AND. mg_switch_to_pe0_level /= -1 ) THEN
767
768	IF ( mg_levels_z > MIN( mg_levels_x, mg_levels_y ) ) THEN
769
770	mg_switch_to_pe0_level_l = maximum_grid_level
771
772	mg_levels_x = 1
773	mg_levels_y = 1
774
775	i = nx+1
776	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
777	i = i / 2
778	mg_levels_x = mg_levels_x + 1
779	ENDDO
780
781	j = ny+1
782	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
783	j = j / 2
784	mg_levels_y = mg_levels_y + 1
785	ENDDO
786
787	maximum_grid_level_l = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
788
789	IF ( maximum_grid_level_l > mg_switch_to_pe0_level_l ) THEN
790	mg_switch_to_pe0_level_l = maximum_grid_level_l - &
791	mg_switch_to_pe0_level_l + 1
792	ELSE
793	mg_switch_to_pe0_level_l = 0
794	ENDIF
795
796	ELSE
797	mg_switch_to_pe0_level_l = 0
798	maximum_grid_level_l = maximum_grid_level
799
800	ENDIF
801
802	!
803	!-- Use switch level calculated above only if it is not pre-defined
804	!-- by user
805	IF ( mg_switch_to_pe0_level == 0 ) THEN
806	IF ( mg_switch_to_pe0_level_l /= 0 ) THEN
807	mg_switch_to_pe0_level = mg_switch_to_pe0_level_l
808	maximum_grid_level = maximum_grid_level_l
809	ENDIF
810
811	ELSE
812	!
813	!-- Check pre-defined value and reset to default, if neccessary
814	IF ( mg_switch_to_pe0_level < mg_switch_to_pe0_level_l .OR. &
815	mg_switch_to_pe0_level >= maximum_grid_level_l ) THEN
816	message_string = 'mg_switch_to_pe0_level ' // &
817	'out of range and reset to default (=0)'
818	CALL message( 'init_pegrid', 'PA0235', 0, 1, 0, 6, 0 )
819	mg_switch_to_pe0_level = 0
820	ELSE
821	!
822	!-- Use the largest number of possible levels anyway and recalculate
823	!-- the switch level to this largest number of possible values
824	maximum_grid_level = maximum_grid_level_l
825
826	ENDIF
827
828	ENDIF
829
830	ENDIF
831
832	ALLOCATE( grid_level_count(maximum_grid_level), &
833	nxl_mg(0:maximum_grid_level), nxr_mg(0:maximum_grid_level), &
834	nyn_mg(0:maximum_grid_level), nys_mg(0:maximum_grid_level), &
835	nzt_mg(0:maximum_grid_level) )
836
837	grid_level_count = 0
838	!
839	!-- Index zero required as dummy due to definition of arrays f2 and p2 in
840	!-- recursive subroutine next_mg_level
841	nxl_mg(0) = 0; nxr_mg(0) = 0; nyn_mg(0) = 0; nys_mg(0) = 0; nzt_mg(0) = 0
842
843	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzt_l = nzt
844
845	DO i = maximum_grid_level, 1 , -1
846
847	IF ( i == mg_switch_to_pe0_level ) THEN
848	#if defined( __parallel ) && ! defined( __check )
849	!
850	!-- Save the grid size of the subdomain at the switch level, because
851	!-- it is needed in poismg.
852	ind(1) = nxl_l; ind(2) = nxr_l
853	ind(3) = nys_l; ind(4) = nyn_l
854	ind(5) = nzt_l
855	ALLOCATE( ind_all(5*numprocs), mg_loc_ind(5,0:numprocs-1) )
856	CALL MPI_ALLGATHER( ind, 5, MPI_INTEGER, ind_all, 5, &
857	MPI_INTEGER, comm2d, ierr )
858	DO j = 0, numprocs-1
859	DO k = 1, 5
860	mg_loc_ind(k,j) = ind_all(k+j*5)
861	ENDDO
862	ENDDO
863	DEALLOCATE( ind_all )
864	!
865	!-- Calculate the grid size of the total domain
866	nxr_l = ( nxr_l-nxl_l+1 ) * pdims(1) - 1
867	nxl_l = 0
868	nyn_l = ( nyn_l-nys_l+1 ) * pdims(2) - 1
869	nys_l = 0
870	!
871	!-- The size of this gathered array must not be larger than the
872	!-- array tend, which is used in the multigrid scheme as a temporary
873	!-- array. Therefore the subdomain size of an PE is calculated and
874	!-- the size of the gathered grid. These values are used in
875	!-- routines pres and poismg
876	subdomain_size = ( nxr - nxl + 2 * nbgp + 1 ) * &
877	( nyn - nys + 2 * nbgp + 1 ) * ( nzt - nzb + 2 )
878	gathered_size = ( nxr_l - nxl_l + 3 ) * ( nyn_l - nys_l + 3 ) * &
879	( nzt_l - nzb + 2 )
880
881	#elif ! defined ( __parallel )
882	message_string = 'multigrid gather/scatter impossible ' // &
883	'in non parallel mode'
884	CALL message( 'init_pegrid', 'PA0237', 1, 2, 0, 6, 0 )
885	#endif
886	ENDIF
887
888	nxl_mg(i) = nxl_l
889	nxr_mg(i) = nxr_l
890	nys_mg(i) = nys_l
891	nyn_mg(i) = nyn_l
892	nzt_mg(i) = nzt_l
893
894	nxl_l = nxl_l / 2
895	nxr_l = nxr_l / 2
896	nys_l = nys_l / 2
897	nyn_l = nyn_l / 2
898	nzt_l = nzt_l / 2
899
900	ENDDO
901
902	!
903	!-- Temporary problem: Currently calculation of maxerror iin routine poismg crashes
904	!-- if grid data are collected on PE0 already on the finest grid level.
905	!-- To be solved later.
906	IF ( maximum_grid_level == mg_switch_to_pe0_level ) THEN
907	message_string = 'grid coarsening on subdomain level cannot be performed'
908	CALL message( 'poismg', 'PA0236', 1, 2, 0, 6, 0 )
909	ENDIF
910
911	ELSE
912
913	maximum_grid_level = 0
914
915	ENDIF
916
917	!
918	!-- Default level 0 tells exchange_horiz that all ghost planes have to be
919	!-- exchanged. grid_level is adjusted in poismg, where only one ghost plane
920	!-- is required.
921	grid_level = 0
922
923	#if defined( __parallel ) && ! defined ( __check )
924	!
925	!-- Gridpoint number for the exchange of ghost points (y-line for 2D-arrays)
926	ngp_y = nyn - nys + 1 + 2 * nbgp
927
928	!
929	!-- Define new MPI derived datatypes for the exchange of ghost points in
930	!-- x- and y-direction for 2D-arrays (line)
931	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_REAL, type_x, &
932	ierr )
933	CALL MPI_TYPE_COMMIT( type_x, ierr )
934	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_INTEGER, &
935	type_x_int, ierr )
936	CALL MPI_TYPE_COMMIT( type_x_int, ierr )
937
938	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_REAL, type_y, ierr )
939	CALL MPI_TYPE_COMMIT( type_y, ierr )
940	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_INTEGER, type_y_int, ierr )
941	CALL MPI_TYPE_COMMIT( type_y_int, ierr )
942
943
944	!
945	!-- Calculate gridpoint numbers for the exchange of ghost points along x
946	!-- (yz-plane for 3D-arrays) and define MPI derived data type(s) for the
947	!-- exchange of ghost points in y-direction (xz-plane).
948	!-- Do these calculations for the model grid and (if necessary) also
949	!-- for the coarser grid levels used in the multigrid method
950	ALLOCATE ( ngp_yz(0:maximum_grid_level), type_xz(0:maximum_grid_level),&
951	type_yz(0:maximum_grid_level) )
952
953	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzb_l = nzb; nzt_l = nzt
954
955	!
956	!-- Discern between the model grid, which needs nbgp ghost points and
957	!-- grid levels for the multigrid scheme. In the latter case only one
958	!-- ghost point is necessary.
959	!-- First definition of MPI-datatypes for exchange of ghost layers on normal
960	!-- grid. The following loop is needed for data exchange in poismg.f90.
961	!
962	!-- Determine number of grid points of yz-layer for exchange
963	ngp_yz(0) = (nzt - nzb + 2) * (nyn - nys + 1 + 2 * nbgp)
964
965	!
966	!-- Define an MPI-datatype for the exchange of left/right boundaries.
967	!-- Although data are contiguous in physical memory (which does not
968	!-- necessarily require an MPI-derived datatype), the data exchange between
969	!-- left and right PE's using the MPI-derived type is 10% faster than without.
970	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2nbgp, nbgp(nzt-nzb+2), ngp_yz(0), &
971	MPI_REAL, type_xz(0), ierr )
972	CALL MPI_TYPE_COMMIT( type_xz(0), ierr )
973
974	CALL MPI_TYPE_VECTOR( nbgp, ngp_yz(0), ngp_yz(0), MPI_REAL, type_yz(0), &
975	ierr )
976	CALL MPI_TYPE_COMMIT( type_yz(0), ierr )
977
978	!
979	!-- Definition of MPI-datatypes for multigrid method (coarser level grids)
980	IF ( psolver == 'multigrid' ) THEN
981	!
982	!-- Definition of MPI-datatyoe as above, but only 1 ghost level is used
983	DO i = maximum_grid_level, 1 , -1
984
985	ngp_yz(i) = (nzt_l - nzb_l + 2) * (nyn_l - nys_l + 3)
986
987	CALL MPI_TYPE_VECTOR( nxr_l-nxl_l+3, nzt_l-nzb_l+2, ngp_yz(i), &
988	MPI_REAL, type_xz(i), ierr )
989	CALL MPI_TYPE_COMMIT( type_xz(i), ierr )
990
991	CALL MPI_TYPE_VECTOR( 1, ngp_yz(i), ngp_yz(i), MPI_REAL, type_yz(i), &
992	ierr )
993	CALL MPI_TYPE_COMMIT( type_yz(i), ierr )
994
995	nxl_l = nxl_l / 2
996	nxr_l = nxr_l / 2
997	nys_l = nys_l / 2
998	nyn_l = nyn_l / 2
999	nzt_l = nzt_l / 2
1000
1001	ENDDO
1002
1003	ENDIF
1004	#endif
1005
1006	#if defined( __parallel ) && ! defined ( __check )
1007	!
1008	!-- Setting of flags for inflow/outflow conditions in case of non-cyclic
1009	!-- horizontal boundary conditions.
1010	IF ( pleft == MPI_PROC_NULL ) THEN
1011	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1012	inflow_l = .TRUE.
1013	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1014	outflow_l = .TRUE.
1015	ENDIF
1016	ENDIF
1017
1018	IF ( pright == MPI_PROC_NULL ) THEN
1019	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1020	outflow_r = .TRUE.
1021	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1022	inflow_r = .TRUE.
1023	ENDIF
1024	ENDIF
1025
1026	IF ( psouth == MPI_PROC_NULL ) THEN
1027	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1028	outflow_s = .TRUE.
1029	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1030	inflow_s = .TRUE.
1031	ENDIF
1032	ENDIF
1033
1034	IF ( pnorth == MPI_PROC_NULL ) THEN
1035	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1036	inflow_n = .TRUE.
1037	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1038	outflow_n = .TRUE.
1039	ENDIF
1040	ENDIF
1041
1042	!
1043	!-- Broadcast the id of the inflow PE
1044	IF ( inflow_l ) THEN
1045	id_inflow_l = myidx
1046	ELSE
1047	id_inflow_l = 0
1048	ENDIF
1049	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1050	CALL MPI_ALLREDUCE( id_inflow_l, id_inflow, 1, MPI_INTEGER, MPI_SUM, &
1051	comm1dx, ierr )
1052
1053	!
1054	!-- Broadcast the id of the recycling plane
1055	!-- WARNING: needs to be adjusted in case of inflows other than from left side!
1056	IF ( NINT( recycling_width / dx ) >= nxl .AND. &
1057	NINT( recycling_width / dx ) <= nxr ) THEN
1058	id_recycling_l = myidx
1059	ELSE
1060	id_recycling_l = 0
1061	ENDIF
1062	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1063	CALL MPI_ALLREDUCE( id_recycling_l, id_recycling, 1, MPI_INTEGER, MPI_SUM, &
1064	comm1dx, ierr )
1065
1066	#elif ! defined ( __parallel )
1067	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1068	inflow_l = .TRUE.
1069	outflow_r = .TRUE.
1070	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1071	outflow_l = .TRUE.
1072	inflow_r = .TRUE.
1073	ENDIF
1074
1075	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1076	inflow_n = .TRUE.
1077	outflow_s = .TRUE.
1078	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1079	outflow_n = .TRUE.
1080	inflow_s = .TRUE.
1081	ENDIF
1082	#endif
1083
1084	!
1085	!-- At the inflow or outflow, u or v, respectively, have to be calculated for
1086	!-- one more grid point.
1087	IF ( inflow_l .OR. outflow_l ) THEN
1088	nxlu = nxl + 1
1089	ELSE
1090	nxlu = nxl
1091	ENDIF
1092	IF ( inflow_s .OR. outflow_s ) THEN
1093	nysv = nys + 1
1094	ELSE
1095	nysv = nys
1096	ENDIF
1097
1098	!
1099	!-- Allocate wall flag arrays used in the multigrid solver
1100	IF ( psolver == 'multigrid' ) THEN
1101
1102	DO i = maximum_grid_level, 1, -1
1103
1104	SELECT CASE ( i )
1105
1106	CASE ( 1 )
1107	ALLOCATE( wall_flags_1(nzb:nzt_mg(i)+1, &
1108	nys_mg(i)-1:nyn_mg(i)+1, &
1109	nxl_mg(i)-1:nxr_mg(i)+1) )
1110
1111	CASE ( 2 )
1112	ALLOCATE( wall_flags_2(nzb:nzt_mg(i)+1, &
1113	nys_mg(i)-1:nyn_mg(i)+1, &
1114	nxl_mg(i)-1:nxr_mg(i)+1) )
1115
1116	CASE ( 3 )
1117	ALLOCATE( wall_flags_3(nzb:nzt_mg(i)+1, &
1118	nys_mg(i)-1:nyn_mg(i)+1, &
1119	nxl_mg(i)-1:nxr_mg(i)+1) )
1120
1121	CASE ( 4 )
1122	ALLOCATE( wall_flags_4(nzb:nzt_mg(i)+1, &
1123	nys_mg(i)-1:nyn_mg(i)+1, &
1124	nxl_mg(i)-1:nxr_mg(i)+1) )
1125
1126	CASE ( 5 )
1127	ALLOCATE( wall_flags_5(nzb:nzt_mg(i)+1, &
1128	nys_mg(i)-1:nyn_mg(i)+1, &
1129	nxl_mg(i)-1:nxr_mg(i)+1) )
1130
1131	CASE ( 6 )
1132	ALLOCATE( wall_flags_6(nzb:nzt_mg(i)+1, &
1133	nys_mg(i)-1:nyn_mg(i)+1, &
1134	nxl_mg(i)-1:nxr_mg(i)+1) )
1135
1136	CASE ( 7 )
1137	ALLOCATE( wall_flags_7(nzb:nzt_mg(i)+1, &
1138	nys_mg(i)-1:nyn_mg(i)+1, &
1139	nxl_mg(i)-1:nxr_mg(i)+1) )
1140
1141	CASE ( 8 )
1142	ALLOCATE( wall_flags_8(nzb:nzt_mg(i)+1, &
1143	nys_mg(i)-1:nyn_mg(i)+1, &
1144	nxl_mg(i)-1:nxr_mg(i)+1) )
1145
1146	CASE ( 9 )
1147	ALLOCATE( wall_flags_9(nzb:nzt_mg(i)+1, &
1148	nys_mg(i)-1:nyn_mg(i)+1, &
1149	nxl_mg(i)-1:nxr_mg(i)+1) )
1150
1151	CASE ( 10 )
1152	ALLOCATE( wall_flags_10(nzb:nzt_mg(i)+1, &
1153	nys_mg(i)-1:nyn_mg(i)+1, &
1154	nxl_mg(i)-1:nxr_mg(i)+1) )
1155
1156	CASE DEFAULT
1157	message_string = 'more than 10 multigrid levels'
1158	CALL message( 'init_pegrid', 'PA0238', 1, 2, 0, 6, 0 )
1159
1160	END SELECT
1161
1162	ENDDO
1163
1164	ENDIF
1165
1166	!
1167	!-- Calculate the number of groups into which parallel I/O is split.
1168	!-- The default for files which are opened by all PEs (or where each
1169	!-- PE opens his own independent file) is, that all PEs are doing input/output
1170	!-- in parallel at the same time. This might cause performance or even more
1171	!-- severe problems depending on the configuration of the underlying file
1172	!-- system.
1173	!-- First, set the default:
1174	IF ( maximum_parallel_io_streams == -1 .OR. &
1175	maximum_parallel_io_streams > numprocs ) THEN
1176	maximum_parallel_io_streams = numprocs
1177	ENDIF
1178
1179	!
1180	!-- Now calculate the number of io_blocks and the io_group to which the
1181	!-- respective PE belongs. I/O of the groups is done in serial, but in parallel
1182	!-- for all PEs belonging to the same group. A preliminary setting with myid
1183	!-- based on MPI_COMM_WORLD has been done in parin.
1184	io_blocks = numprocs / maximum_parallel_io_streams
1185	io_group = MOD( myid+1, io_blocks )
1186
1187
1188	END SUBROUTINE init_pegrid

Note: See TracBrowser for help on using the repository browser.

Download in other formats:

| Impressum | ©Leibniz Universität Hannover |