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source: palm/trunk/SOURCE/init_pegrid.f90 @ 1385

Last change on this file since 1385 was 1385, checked in by raasch, 10 years ago
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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	!
24	! Former revisions:
25	! -----------------
26	! $Id: init_pegrid.f90 1385 2014-05-02 14:39:33Z raasch $
27	!
28	! 1384 2014-05-02 14:31:06Z raasch
29	! location messages added
30	!
31	! 1353 2014-04-08 15:21:23Z heinze
32	! REAL constants provided with KIND-attribute
33	!
34	! 1322 2014-03-20 16:38:49Z raasch
35	! REAL functions provided with KIND-attribute
36	!
37	! 1320 2014-03-20 08:40:49Z raasch
38	! ONLY-attribute added to USE-statements,
39	! kind-parameters added to all INTEGER and REAL declaration statements,
40	! kinds are defined in new module kinds,
41	! revision history before 2012 removed,
42	! comment fields (!:) to be used for variable explanations added to
43	! all variable declaration statements
44	!
45	! 1304 2014-03-12 10:29:42Z raasch
46	! bugfix: single core MPI runs missed some settings of transpose indices
47	!
48	! 1212 2013-08-15 08:46:27Z raasch
49	! error message for poisfft_hybrid removed
50	!
51	! 1159 2013-05-21 11:58:22Z fricke
52	! dirichlet/neumann and neumann/dirichlet removed
53	!
54	! 1139 2013-04-18 07:25:03Z raasch
55	! bugfix for calculating the id of the PE carrying the recycling plane
56	!
57	! 1111 2013-03-08 23:54:10Z raasch
58	! initialization of poisfft moved to module poisfft
59	!
60	! 1092 2013-02-02 11:24:22Z raasch
61	! unused variables removed
62	!
63	! 1056 2012-11-16 15:28:04Z raasch
64	! Indices for arrays n.._mg start from zero due to definition of arrays f2 and
65	! p2 as automatic arrays in recursive subroutine next_mg_level
66	!
67	! 1041 2012-11-06 02:36:29Z raasch
68	! a 2d virtual processor topology is used by default for all machines
69	!
70	! 1036 2012-10-22 13:43:42Z raasch
71	! code put under GPL (PALM 3.9)
72	!
73	! 1003 2012-09-14 14:35:53Z raasch
74	! subdomains must have identical size (grid matching = "match" removed)
75	!
76	! 1001 2012-09-13 14:08:46Z raasch
77	! all actions concerning upstream-spline-method removed
78	!
79	! 978 2012-08-09 08:28:32Z fricke
80	! dirichlet/neumann and neumann/dirichlet added
81	! nxlu and nysv are also calculated for inflow boundary
82	!
83	! 809 2012-01-30 13:32:58Z maronga
84	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
85	!
86	! 807 2012-01-25 11:53:51Z maronga
87	! New cpp directive "__check" implemented which is used by check_namelist_files
88	!
89	! Revision 1.1 1997/07/24 11:15:09 raasch
90	! Initial revision
91	!
92	!
93	! Description:
94	! ------------
95	! Determination of the virtual processor topology (if not prescribed by the
96	! user)and computation of the grid point number and array bounds of the local
97	! domains.
98	!------------------------------------------------------------------------------!
99
100	USE control_parameters, &
101	ONLY: bc_lr, bc_ns, coupling_mode, coupling_topology, dt_dosp, &
102	gathered_size, grid_level, grid_level_count, host, inflow_l, &
103	inflow_n, inflow_r, inflow_s, io_blocks, io_group, &
104	maximum_grid_level, maximum_parallel_io_streams, message_string,&
105	mg_switch_to_pe0_level, momentum_advec, psolver, outflow_l, &
106	outflow_n, outflow_r, outflow_s, recycling_width, scalar_advec, &
107	subdomain_size
108
109	USE grid_variables, &
110	ONLY: dx
111
112	USE indices, &
113	ONLY: mg_loc_ind, nbgp, nnx, nny, nnz, nx, nx_a, nx_o, nxl, nxl_mg, &
114	nxlu, nxr, nxr_mg, ny, ny_a, ny_o, nyn, nyn_mg, nys, nys_mg, &
115	nysv, nz, nzb, nzt, nzt_mg, wall_flags_1, wall_flags_2, &
116	wall_flags_3, wall_flags_4, wall_flags_5, wall_flags_6, &
117	wall_flags_7, wall_flags_8, wall_flags_9, wall_flags_10
118
119	USE kinds
120
121	USE pegrid
122
123	USE transpose_indices, &
124	ONLY: nxl_y, nxl_yd, nxl_z, nxr_y, nxr_yd, nxr_z, nyn_x, nyn_z, nys_x,&
125	nys_z, nzb_x, nzb_y, nzb_yd, nzt_x, nzt_yd, nzt_y
126
127	IMPLICIT NONE
128
129	INTEGER(iwp) :: i !:
130	INTEGER(iwp) :: id_inflow_l !:
131	INTEGER(iwp) :: id_recycling_l !:
132	INTEGER(iwp) :: ind(5) !:
133	INTEGER(iwp) :: j !:
134	INTEGER(iwp) :: k !:
135	INTEGER(iwp) :: maximum_grid_level_l !:
136	INTEGER(iwp) :: mg_levels_x !:
137	INTEGER(iwp) :: mg_levels_y !:
138	INTEGER(iwp) :: mg_levels_z !:
139	INTEGER(iwp) :: mg_switch_to_pe0_level_l !:
140	INTEGER(iwp) :: nnx_y !:
141	INTEGER(iwp) :: nnx_z !:
142	INTEGER(iwp) :: nny_x !:
143	INTEGER(iwp) :: nny_z !:
144	INTEGER(iwp) :: nnz_x !:
145	INTEGER(iwp) :: nnz_y !:
146	INTEGER(iwp) :: numproc_sqr !:
147	INTEGER(iwp) :: nxl_l !:
148	INTEGER(iwp) :: nxr_l !:
149	INTEGER(iwp) :: nyn_l !:
150	INTEGER(iwp) :: nys_l !:
151	INTEGER(iwp) :: nzb_l !:
152	INTEGER(iwp) :: nzt_l !:
153	INTEGER(iwp) :: omp_get_num_threads !:
154
155	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: ind_all !:
156	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxlf !:
157	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxrf !:
158	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nynf !:
159	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nysf !:
160
161	INTEGER(iwp), DIMENSION(2) :: pdims_remote !:
162
163	#if defined( __mpi2 )
164	LOGICAL :: found !:
165	#endif
166
167	!
168	!-- Get the number of OpenMP threads
169	!$OMP PARALLEL
170	#if defined( __intel_openmp_bug )
171	threads_per_task = omp_get_num_threads()
172	#else
173	!$ threads_per_task = omp_get_num_threads()
174	#endif
175	!$OMP END PARALLEL
176
177
178	#if defined( __parallel )
179
180	CALL location_message( 'creating virtual PE grids + MPI derived data types' )
181	!
182	!-- Determine the processor topology or check it, if prescribed by the user
183	IF ( npex == -1 .AND. npey == -1 ) THEN
184
185	!
186	!-- Automatic determination of the topology
187	numproc_sqr = SQRT( REAL( numprocs, KIND=wp ) )
188	pdims(1) = MAX( numproc_sqr , 1 )
189	DO WHILE ( MOD( numprocs , pdims(1) ) /= 0 )
190	pdims(1) = pdims(1) - 1
191	ENDDO
192	pdims(2) = numprocs / pdims(1)
193
194	ELSEIF ( npex /= -1 .AND. npey /= -1 ) THEN
195
196	!
197	!-- Prescribed by user. Number of processors on the prescribed topology
198	!-- must be equal to the number of PEs available to the job
199	IF ( ( npex * npey ) /= numprocs ) THEN
200	WRITE( message_string, * ) 'number of PEs of the prescribed ', &
201	'topology (', npex*npey,') does not match & the number of ', &
202	'PEs available to the job (', numprocs, ')'
203	CALL message( 'init_pegrid', 'PA0221', 1, 2, 0, 6, 0 )
204	ENDIF
205	pdims(1) = npex
206	pdims(2) = npey
207
208	ELSE
209	!
210	!-- If the processor topology is prescribed by the user, the number of
211	!-- PEs must be given in both directions
212	message_string = 'if the processor topology is prescribed by the, ' // &
213	' user& both values of "npex" and "npey" must be given ' // &
214	'in the &NAMELIST-parameter file'
215	CALL message( 'init_pegrid', 'PA0222', 1, 2, 0, 6, 0 )
216
217	ENDIF
218
219	!
220	!-- For communication speedup, set barriers in front of collective
221	!-- communications by default on SGI-type systems
222	IF ( host(3:5) == 'sgi' ) collective_wait = .TRUE.
223
224	!
225	!-- If necessary, set horizontal boundary conditions to non-cyclic
226	IF ( bc_lr /= 'cyclic' ) cyclic(1) = .FALSE.
227	IF ( bc_ns /= 'cyclic' ) cyclic(2) = .FALSE.
228
229
230	#if ! defined( __check)
231	!
232	!-- Create the virtual processor grid
233	CALL MPI_CART_CREATE( comm_palm, ndim, pdims, cyclic, reorder, &
234	comm2d, ierr )
235	CALL MPI_COMM_RANK( comm2d, myid, ierr )
236	WRITE (myid_char,'(''_'',I4.4)') myid
237
238	CALL MPI_CART_COORDS( comm2d, myid, ndim, pcoord, ierr )
239	CALL MPI_CART_SHIFT( comm2d, 0, 1, pleft, pright, ierr )
240	CALL MPI_CART_SHIFT( comm2d, 1, 1, psouth, pnorth, ierr )
241
242	!
243	!-- Determine sub-topologies for transpositions
244	!-- Transposition from z to x:
245	remain_dims(1) = .TRUE.
246	remain_dims(2) = .FALSE.
247	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dx, ierr )
248	CALL MPI_COMM_RANK( comm1dx, myidx, ierr )
249	!
250	!-- Transposition from x to y
251	remain_dims(1) = .FALSE.
252	remain_dims(2) = .TRUE.
253	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dy, ierr )
254	CALL MPI_COMM_RANK( comm1dy, myidy, ierr )
255
256	#endif
257
258	!
259	!-- Calculate array bounds along x-direction for every PE.
260	ALLOCATE( nxlf(0:pdims(1)-1), nxrf(0:pdims(1)-1), nynf(0:pdims(2)-1), &
261	nysf(0:pdims(2)-1) )
262
263	IF ( MOD( nx+1 , pdims(1) ) /= 0 ) THEN
264	WRITE( message_string, * ) 'x-direction: gridpoint number (',nx+1,') ',&
265	'is not an& integral divisor of the number ', &
266	'processors (', pdims(1),')'
267	CALL message( 'init_pegrid', 'PA0225', 1, 2, 0, 6, 0 )
268	ELSE
269	nnx = ( nx + 1 ) / pdims(1)
270	IF ( nnx*pdims(1) - ( nx + 1) > nnx ) THEN
271	WRITE( message_string, * ) 'x-direction: nx does not match the', &
272	'requirements given by the number of PEs &used', &
273	'& please use nx = ', nx - ( pdims(1) - ( nnx*pdims(1) &
274	- ( nx + 1 ) ) ), ' instead of nx =', nx
275	CALL message( 'init_pegrid', 'PA0226', 1, 2, 0, 6, 0 )
276	ENDIF
277	ENDIF
278
279	!
280	!-- Left and right array bounds, number of gridpoints
281	DO i = 0, pdims(1)-1
282	nxlf(i) = i * nnx
283	nxrf(i) = ( i + 1 ) * nnx - 1
284	ENDDO
285
286	!
287	!-- Calculate array bounds in y-direction for every PE.
288	IF ( MOD( ny+1 , pdims(2) ) /= 0 ) THEN
289	WRITE( message_string, * ) 'y-direction: gridpoint number (',ny+1,') ', &
290	'is not an& integral divisor of the number of', &
291	'processors (', pdims(2),')'
292	CALL message( 'init_pegrid', 'PA0227', 1, 2, 0, 6, 0 )
293	ELSE
294	nny = ( ny + 1 ) / pdims(2)
295	IF ( nny*pdims(2) - ( ny + 1) > nny ) THEN
296	WRITE( message_string, * ) 'y-direction: ny does not match the', &
297	'requirements given by the number of PEs &used ', &
298	'& please use ny = ', ny - ( pdims(2) - ( nnx*pdims(2) &
299	- ( ny + 1 ) ) ), ' instead of ny =', ny
300	CALL message( 'init_pegrid', 'PA0228', 1, 2, 0, 6, 0 )
301	ENDIF
302	ENDIF
303
304	!
305	!-- South and north array bounds
306	DO j = 0, pdims(2)-1
307	nysf(j) = j * nny
308	nynf(j) = ( j + 1 ) * nny - 1
309	ENDDO
310
311	!
312	!-- Local array bounds of the respective PEs
313	nxl = nxlf(pcoord(1))
314	nxr = nxrf(pcoord(1))
315	nys = nysf(pcoord(2))
316	nyn = nynf(pcoord(2))
317	nzb = 0
318	nzt = nz
319	nnz = nz
320
321	!
322	!-- Set switches to define if the PE is situated at the border of the virtual
323	!-- processor grid
324	IF ( nxl == 0 ) left_border_pe = .TRUE.
325	IF ( nxr == nx ) right_border_pe = .TRUE.
326	IF ( nys == 0 ) south_border_pe = .TRUE.
327	IF ( nyn == ny ) north_border_pe = .TRUE.
328
329	!
330	!-- Calculate array bounds and gridpoint numbers for the transposed arrays
331	!-- (needed in the pressure solver)
332	!-- For the transposed arrays, cyclic boundaries as well as top and bottom
333	!-- boundaries are omitted, because they are obstructive to the transposition
334
335	!
336	!-- 1. transposition z --> x
337	!-- This transposition is not neccessary in case of a 1d-decomposition along x
338	nys_x = nys
339	nyn_x = nyn
340	nny_x = nny
341	nnz_x = nz / pdims(1)
342	nzb_x = 1 + myidx * nnz_x
343	nzt_x = ( myidx + 1 ) * nnz_x
344	sendrecvcount_zx = nnx * nny * nnz_x
345
346	IF ( pdims(2) /= 1 ) THEN
347	IF ( MOD( nz , pdims(1) ) /= 0 ) THEN
348	WRITE( message_string, * ) 'transposition z --> x:', &
349	'&nz=',nz,' is not an integral divisior of pdims(1)=', &
350	pdims(1)
351	CALL message( 'init_pegrid', 'PA0230', 1, 2, 0, 6, 0 )
352	ENDIF
353	ENDIF
354
355	!
356	!-- 2. transposition x --> y
357	nnz_y = nnz_x
358	nzb_y = nzb_x
359	nzt_y = nzt_x
360	IF ( MOD( nx+1 , pdims(2) ) /= 0 ) THEN
361	WRITE( message_string, * ) 'transposition x --> y:', &
362	'&nx+1=',nx+1,' is not an integral divisor of ',&
363	'pdims(2)=',pdims(2)
364	CALL message( 'init_pegrid', 'PA0231', 1, 2, 0, 6, 0 )
365	ENDIF
366	nnx_y = (nx+1) / pdims(2)
367	nxl_y = myidy * nnx_y
368	nxr_y = ( myidy + 1 ) * nnx_y - 1
369	sendrecvcount_xy = nnx_y * nny_x * nnz_y
370
371	!
372	!-- 3. transposition y --> z (ELSE: x --> y in case of 1D-decomposition
373	!-- along x)
374	nnx_z = nnx_y
375	nxl_z = nxl_y
376	nxr_z = nxr_y
377	nny_z = (ny+1) / pdims(1)
378	nys_z = myidx * nny_z
379	nyn_z = ( myidx + 1 ) * nny_z - 1
380	sendrecvcount_yz = nnx_y * nny_z * nnz_y
381
382	IF ( pdims(2) /= 1 ) THEN
383	!
384	!-- y --> z
385	!-- This transposition is not neccessary in case of a 1d-decomposition
386	!-- along x, except that the uptream-spline method is switched on
387	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
388	WRITE( message_string, * ) 'transposition y --> z:', &
389	'& ny+1=',ny+1,' is not an integral divisor of ',&
390	'pdims(1)=',pdims(1)
391	CALL message( 'init_pegrid', 'PA0232', 1, 2, 0, 6, 0 )
392	ENDIF
393
394	ELSE
395	!
396	!-- x --> y. This condition must be fulfilled for a 1D-decomposition along x
397	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
398	WRITE( message_string, * ) 'transposition x --> y:', &
399	'& ny+1=',ny+1,' is not an integral divisor of ',&
400	'pdims(1)=',pdims(1)
401	CALL message( 'init_pegrid', 'PA0233', 1, 2, 0, 6, 0 )
402	ENDIF
403
404	ENDIF
405
406	!
407	!-- Indices for direct transpositions z --> y (used for calculating spectra)
408	IF ( dt_dosp /= 9999999.9_wp ) THEN
409	IF ( MOD( nz, pdims(2) ) /= 0 ) THEN
410	WRITE( message_string, * ) 'direct transposition z --> y (needed ', &
411	'for spectra):& nz=',nz,' is not an integral divisor of ',&
412	'pdims(2)=',pdims(2)
413	CALL message( 'init_pegrid', 'PA0234', 1, 2, 0, 6, 0 )
414	ELSE
415	nxl_yd = nxl
416	nxr_yd = nxr
417	nzb_yd = 1 + myidy * ( nz / pdims(2) )
418	nzt_yd = ( myidy + 1 ) * ( nz / pdims(2) )
419	sendrecvcount_zyd = nnx * nny * ( nz / pdims(2) )
420	ENDIF
421	ENDIF
422
423	!
424	!-- Indices for direct transpositions y --> x (they are only possible in case
425	!-- of a 1d-decomposition along x)
426	IF ( pdims(2) == 1 ) THEN
427	nny_x = nny / pdims(1)
428	nys_x = myid * nny_x
429	nyn_x = ( myid + 1 ) * nny_x - 1
430	nzb_x = 1
431	nzt_x = nz
432	sendrecvcount_xy = nnx * nny_x * nz
433	ENDIF
434
435	!
436	!-- Indices for direct transpositions x --> y (they are only possible in case
437	!-- of a 1d-decomposition along y)
438	IF ( pdims(1) == 1 ) THEN
439	nnx_y = nnx / pdims(2)
440	nxl_y = myid * nnx_y
441	nxr_y = ( myid + 1 ) * nnx_y - 1
442	nzb_y = 1
443	nzt_y = nz
444	sendrecvcount_xy = nnx_y * nny * nz
445	ENDIF
446
447	!
448	!-- Arrays for storing the array bounds are needed any more
449	DEALLOCATE( nxlf , nxrf , nynf , nysf )
450
451
452	#if ! defined( __check)
453	!
454	!-- Collect index bounds from other PEs (to be written to restart file later)
455	ALLOCATE( hor_index_bounds(4,0:numprocs-1) )
456
457	IF ( myid == 0 ) THEN
458
459	hor_index_bounds(1,0) = nxl
460	hor_index_bounds(2,0) = nxr
461	hor_index_bounds(3,0) = nys
462	hor_index_bounds(4,0) = nyn
463
464	!
465	!-- Receive data from all other PEs
466	DO i = 1, numprocs-1
467	CALL MPI_RECV( ibuf, 4, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
468	ierr )
469	hor_index_bounds(:,i) = ibuf(1:4)
470	ENDDO
471
472	ELSE
473	!
474	!-- Send index bounds to PE0
475	ibuf(1) = nxl
476	ibuf(2) = nxr
477	ibuf(3) = nys
478	ibuf(4) = nyn
479	CALL MPI_SEND( ibuf, 4, MPI_INTEGER, 0, myid, comm2d, ierr )
480
481	ENDIF
482
483	#endif
484
485	#if defined( __print )
486	!
487	!-- Control output
488	IF ( myid == 0 ) THEN
489	PRINT, ' processor topology *'
490	PRINT*, ' '
491	PRINT*, 'myid pcoord left right south north idx idy nxl: nxr',&
492	&' nys: nyn'
493	PRINT*, '------------------------------------------------------------',&
494	&'-----------'
495	WRITE (*,1000) 0, pcoord(1), pcoord(2), pleft, pright, psouth, pnorth, &
496	myidx, myidy, nxl, nxr, nys, nyn
497	1000 FORMAT (I4,2X,'(',I3,',',I3,')',3X,I4,2X,I4,3X,I4,2X,I4,2X,I3,1X,I3, &
498	2(2X,I4,':',I4))
499
500	!
501	!-- Receive data from the other PEs
502	DO i = 1,numprocs-1
503	CALL MPI_RECV( ibuf, 12, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
504	ierr )
505	WRITE (*,1000) i, ( ibuf(j) , j = 1,12 )
506	ENDDO
507	ELSE
508
509	!
510	!-- Send data to PE0
511	ibuf(1) = pcoord(1); ibuf(2) = pcoord(2); ibuf(3) = pleft
512	ibuf(4) = pright; ibuf(5) = psouth; ibuf(6) = pnorth; ibuf(7) = myidx
513	ibuf(8) = myidy; ibuf(9) = nxl; ibuf(10) = nxr; ibuf(11) = nys
514	ibuf(12) = nyn
515	CALL MPI_SEND( ibuf, 12, MPI_INTEGER, 0, myid, comm2d, ierr )
516	ENDIF
517	#endif
518
519	#if defined( __parallel ) && ! defined( __check)
520	#if defined( __mpi2 )
521	!
522	!-- In case of coupled runs, get the port name on PE0 of the atmosphere model
523	!-- and pass it to PE0 of the ocean model
524	IF ( myid == 0 ) THEN
525
526	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
527
528	CALL MPI_OPEN_PORT( MPI_INFO_NULL, port_name, ierr )
529
530	CALL MPI_PUBLISH_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, &
531	ierr )
532
533	!
534	!-- Write a flag file for the ocean model and the other atmosphere
535	!-- processes.
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	OPEN( 90, FILE='COUPLING_PORT_OPENED', FORM='FORMATTED' )
540	WRITE ( 90, '(''TRUE'')' )
541	CLOSE ( 90 )
542
543	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
544
545	!
546	!-- Continue only if the atmosphere model has created the port.
547	!-- There seems to be a bug in MPICH2 which causes hanging processes
548	!-- in case that execution of LOOKUP_NAME is continued too early
549	!-- (i.e. before the port has been created)
550	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
551	DO WHILE ( .NOT. found )
552	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
553	ENDDO
554
555	CALL MPI_LOOKUP_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, ierr )
556
557	ENDIF
558
559	ENDIF
560
561	!
562	!-- In case of coupled runs, establish the connection between the atmosphere
563	!-- and the ocean model and define the intercommunicator (comm_inter)
564	CALL MPI_BARRIER( comm2d, ierr )
565	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
566
567	CALL MPI_COMM_ACCEPT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
568	comm_inter, ierr )
569	coupling_mode_remote = 'ocean_to_atmosphere'
570
571	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
572
573	CALL MPI_COMM_CONNECT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
574	comm_inter, ierr )
575	coupling_mode_remote = 'atmosphere_to_ocean'
576
577	ENDIF
578	#endif
579
580	!
581	!-- Determine the number of ghost point layers
582	IF ( scalar_advec == 'ws-scheme' .OR. momentum_advec == 'ws-scheme' ) THEN
583	nbgp = 3
584	ELSE
585	nbgp = 1
586	ENDIF
587
588	!
589	!-- Create a new MPI derived datatype for the exchange of surface (xy) data,
590	!-- which is needed for coupled atmosphere-ocean runs.
591	!-- First, calculate number of grid points of an xy-plane.
592	ngp_xy = ( nxr - nxl + 1 + 2 * nbgp ) * ( nyn - nys + 1 + 2 * nbgp )
593	CALL MPI_TYPE_VECTOR( ngp_xy, 1, nzt-nzb+2, MPI_REAL, type_xy, ierr )
594	CALL MPI_TYPE_COMMIT( type_xy, ierr )
595
596	IF ( TRIM( coupling_mode ) /= 'uncoupled' ) THEN
597
598	!
599	!-- Pass the number of grid points of the atmosphere model to
600	!-- the ocean model and vice versa
601	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
602
603	nx_a = nx
604	ny_a = ny
605
606	IF ( myid == 0 ) THEN
607
608	CALL MPI_SEND( nx_a, 1, MPI_INTEGER, numprocs, 1, comm_inter, &
609	ierr )
610	CALL MPI_SEND( ny_a, 1, MPI_INTEGER, numprocs, 2, comm_inter, &
611	ierr )
612	CALL MPI_SEND( pdims, 2, MPI_INTEGER, numprocs, 3, comm_inter, &
613	ierr )
614	CALL MPI_RECV( nx_o, 1, MPI_INTEGER, numprocs, 4, comm_inter, &
615	status, ierr )
616	CALL MPI_RECV( ny_o, 1, MPI_INTEGER, numprocs, 5, comm_inter, &
617	status, ierr )
618	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, numprocs, 6, &
619	comm_inter, status, ierr )
620	ENDIF
621
622	CALL MPI_BCAST( nx_o, 1, MPI_INTEGER, 0, comm2d, ierr )
623	CALL MPI_BCAST( ny_o, 1, MPI_INTEGER, 0, comm2d, ierr )
624	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr )
625
626	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
627
628	nx_o = nx
629	ny_o = ny
630
631	IF ( myid == 0 ) THEN
632
633	CALL MPI_RECV( nx_a, 1, MPI_INTEGER, 0, 1, comm_inter, status, &
634	ierr )
635	CALL MPI_RECV( ny_a, 1, MPI_INTEGER, 0, 2, comm_inter, status, &
636	ierr )
637	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, 0, 3, comm_inter, &
638	status, ierr )
639	CALL MPI_SEND( nx_o, 1, MPI_INTEGER, 0, 4, comm_inter, ierr )
640	CALL MPI_SEND( ny_o, 1, MPI_INTEGER, 0, 5, comm_inter, ierr )
641	CALL MPI_SEND( pdims, 2, MPI_INTEGER, 0, 6, comm_inter, ierr )
642	ENDIF
643
644	CALL MPI_BCAST( nx_a, 1, MPI_INTEGER, 0, comm2d, ierr)
645	CALL MPI_BCAST( ny_a, 1, MPI_INTEGER, 0, comm2d, ierr)
646	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr)
647
648	ENDIF
649
650	ngp_a = ( nx_a+1 + 2 * nbgp ) * ( ny_a+1 + 2 * nbgp )
651	ngp_o = ( nx_o+1 + 2 * nbgp ) * ( ny_o+1 + 2 * nbgp )
652
653	!
654	!-- Determine if the horizontal grid and the number of PEs in ocean and
655	!-- atmosphere is same or not
656	IF ( nx_o == nx_a .AND. ny_o == ny_a .AND. &
657	pdims(1) == pdims_remote(1) .AND. pdims(2) == pdims_remote(2) ) &
658	THEN
659	coupling_topology = 0
660	ELSE
661	coupling_topology = 1
662	ENDIF
663
664	!
665	!-- Determine the target PEs for the exchange between ocean and
666	!-- atmosphere (comm2d)
667	IF ( coupling_topology == 0 ) THEN
668	!
669	!-- In case of identical topologies, every atmosphere PE has exactly one
670	!-- ocean PE counterpart and vice versa
671	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
672	target_id = myid + numprocs
673	ELSE
674	target_id = myid
675	ENDIF
676
677	ELSE
678	!
679	!-- In case of nonequivalent topology in ocean and atmosphere only for
680	!-- PE0 in ocean and PE0 in atmosphere a target_id is needed, since
681	!-- data echxchange between ocean and atmosphere will be done only
682	!-- between these PEs.
683	IF ( myid == 0 ) THEN
684
685	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
686	target_id = numprocs
687	ELSE
688	target_id = 0
689	ENDIF
690
691	ENDIF
692
693	ENDIF
694
695	ENDIF
696
697
698	#endif
699
700	#else
701
702	!
703	!-- Array bounds when running on a single PE (respectively a non-parallel
704	!-- machine)
705	nxl = 0
706	nxr = nx
707	nnx = nxr - nxl + 1
708	nys = 0
709	nyn = ny
710	nny = nyn - nys + 1
711	nzb = 0
712	nzt = nz
713	nnz = nz
714
715	ALLOCATE( hor_index_bounds(4,0:0) )
716	hor_index_bounds(1,0) = nxl
717	hor_index_bounds(2,0) = nxr
718	hor_index_bounds(3,0) = nys
719	hor_index_bounds(4,0) = nyn
720
721	!
722	!-- Array bounds for the pressure solver (in the parallel code, these bounds
723	!-- are the ones for the transposed arrays)
724	nys_x = nys
725	nyn_x = nyn
726	nzb_x = nzb + 1
727	nzt_x = nzt
728
729	nxl_y = nxl
730	nxr_y = nxr
731	nzb_y = nzb + 1
732	nzt_y = nzt
733
734	nxl_z = nxl
735	nxr_z = nxr
736	nys_z = nys
737	nyn_z = nyn
738
739	#endif
740
741	!
742	!-- Calculate number of grid levels necessary for the multigrid poisson solver
743	!-- as well as the gridpoint indices on each level
744	IF ( psolver == 'multigrid' ) THEN
745
746	!
747	!-- First calculate number of possible grid levels for the subdomains
748	mg_levels_x = 1
749	mg_levels_y = 1
750	mg_levels_z = 1
751
752	i = nnx
753	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
754	i = i / 2
755	mg_levels_x = mg_levels_x + 1
756	ENDDO
757
758	j = nny
759	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
760	j = j / 2
761	mg_levels_y = mg_levels_y + 1
762	ENDDO
763
764	k = nz ! do not use nnz because it might be > nz due to transposition
765	! requirements
766	DO WHILE ( MOD( k, 2 ) == 0 .AND. k /= 2 )
767	k = k / 2
768	mg_levels_z = mg_levels_z + 1
769	ENDDO
770
771	maximum_grid_level = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
772
773	!
774	!-- Find out, if the total domain allows more levels. These additional
775	!-- levels are identically processed on all PEs.
776	IF ( numprocs > 1 .AND. mg_switch_to_pe0_level /= -1 ) THEN
777
778	IF ( mg_levels_z > MIN( mg_levels_x, mg_levels_y ) ) THEN
779
780	mg_switch_to_pe0_level_l = maximum_grid_level
781
782	mg_levels_x = 1
783	mg_levels_y = 1
784
785	i = nx+1
786	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
787	i = i / 2
788	mg_levels_x = mg_levels_x + 1
789	ENDDO
790
791	j = ny+1
792	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
793	j = j / 2
794	mg_levels_y = mg_levels_y + 1
795	ENDDO
796
797	maximum_grid_level_l = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
798
799	IF ( maximum_grid_level_l > mg_switch_to_pe0_level_l ) THEN
800	mg_switch_to_pe0_level_l = maximum_grid_level_l - &
801	mg_switch_to_pe0_level_l + 1
802	ELSE
803	mg_switch_to_pe0_level_l = 0
804	ENDIF
805
806	ELSE
807	mg_switch_to_pe0_level_l = 0
808	maximum_grid_level_l = maximum_grid_level
809
810	ENDIF
811
812	!
813	!-- Use switch level calculated above only if it is not pre-defined
814	!-- by user
815	IF ( mg_switch_to_pe0_level == 0 ) THEN
816	IF ( mg_switch_to_pe0_level_l /= 0 ) THEN
817	mg_switch_to_pe0_level = mg_switch_to_pe0_level_l
818	maximum_grid_level = maximum_grid_level_l
819	ENDIF
820
821	ELSE
822	!
823	!-- Check pre-defined value and reset to default, if neccessary
824	IF ( mg_switch_to_pe0_level < mg_switch_to_pe0_level_l .OR. &
825	mg_switch_to_pe0_level >= maximum_grid_level_l ) THEN
826	message_string = 'mg_switch_to_pe0_level ' // &
827	'out of range and reset to default (=0)'
828	CALL message( 'init_pegrid', 'PA0235', 0, 1, 0, 6, 0 )
829	mg_switch_to_pe0_level = 0
830	ELSE
831	!
832	!-- Use the largest number of possible levels anyway and recalculate
833	!-- the switch level to this largest number of possible values
834	maximum_grid_level = maximum_grid_level_l
835
836	ENDIF
837
838	ENDIF
839
840	ENDIF
841
842	ALLOCATE( grid_level_count(maximum_grid_level), &
843	nxl_mg(0:maximum_grid_level), nxr_mg(0:maximum_grid_level), &
844	nyn_mg(0:maximum_grid_level), nys_mg(0:maximum_grid_level), &
845	nzt_mg(0:maximum_grid_level) )
846
847	grid_level_count = 0
848	!
849	!-- Index zero required as dummy due to definition of arrays f2 and p2 in
850	!-- recursive subroutine next_mg_level
851	nxl_mg(0) = 0; nxr_mg(0) = 0; nyn_mg(0) = 0; nys_mg(0) = 0; nzt_mg(0) = 0
852
853	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzt_l = nzt
854
855	DO i = maximum_grid_level, 1 , -1
856
857	IF ( i == mg_switch_to_pe0_level ) THEN
858	#if defined( __parallel ) && ! defined( __check )
859	!
860	!-- Save the grid size of the subdomain at the switch level, because
861	!-- it is needed in poismg.
862	ind(1) = nxl_l; ind(2) = nxr_l
863	ind(3) = nys_l; ind(4) = nyn_l
864	ind(5) = nzt_l
865	ALLOCATE( ind_all(5*numprocs), mg_loc_ind(5,0:numprocs-1) )
866	CALL MPI_ALLGATHER( ind, 5, MPI_INTEGER, ind_all, 5, &
867	MPI_INTEGER, comm2d, ierr )
868	DO j = 0, numprocs-1
869	DO k = 1, 5
870	mg_loc_ind(k,j) = ind_all(k+j*5)
871	ENDDO
872	ENDDO
873	DEALLOCATE( ind_all )
874	!
875	!-- Calculate the grid size of the total domain
876	nxr_l = ( nxr_l-nxl_l+1 ) * pdims(1) - 1
877	nxl_l = 0
878	nyn_l = ( nyn_l-nys_l+1 ) * pdims(2) - 1
879	nys_l = 0
880	!
881	!-- The size of this gathered array must not be larger than the
882	!-- array tend, which is used in the multigrid scheme as a temporary
883	!-- array. Therefore the subdomain size of an PE is calculated and
884	!-- the size of the gathered grid. These values are used in
885	!-- routines pres and poismg
886	subdomain_size = ( nxr - nxl + 2 * nbgp + 1 ) * &
887	( nyn - nys + 2 * nbgp + 1 ) * ( nzt - nzb + 2 )
888	gathered_size = ( nxr_l - nxl_l + 3 ) * ( nyn_l - nys_l + 3 ) * &
889	( nzt_l - nzb + 2 )
890
891	#elif ! defined ( __parallel )
892	message_string = 'multigrid gather/scatter impossible ' // &
893	'in non parallel mode'
894	CALL message( 'init_pegrid', 'PA0237', 1, 2, 0, 6, 0 )
895	#endif
896	ENDIF
897
898	nxl_mg(i) = nxl_l
899	nxr_mg(i) = nxr_l
900	nys_mg(i) = nys_l
901	nyn_mg(i) = nyn_l
902	nzt_mg(i) = nzt_l
903
904	nxl_l = nxl_l / 2
905	nxr_l = nxr_l / 2
906	nys_l = nys_l / 2
907	nyn_l = nyn_l / 2
908	nzt_l = nzt_l / 2
909
910	ENDDO
911
912	!
913	!-- Temporary problem: Currently calculation of maxerror iin routine poismg crashes
914	!-- if grid data are collected on PE0 already on the finest grid level.
915	!-- To be solved later.
916	IF ( maximum_grid_level == mg_switch_to_pe0_level ) THEN
917	message_string = 'grid coarsening on subdomain level cannot be performed'
918	CALL message( 'poismg', 'PA0236', 1, 2, 0, 6, 0 )
919	ENDIF
920
921	ELSE
922
923	maximum_grid_level = 0
924
925	ENDIF
926
927	!
928	!-- Default level 0 tells exchange_horiz that all ghost planes have to be
929	!-- exchanged. grid_level is adjusted in poismg, where only one ghost plane
930	!-- is required.
931	grid_level = 0
932
933	#if defined( __parallel ) && ! defined ( __check )
934	!
935	!-- Gridpoint number for the exchange of ghost points (y-line for 2D-arrays)
936	ngp_y = nyn - nys + 1 + 2 * nbgp
937
938	!
939	!-- Define new MPI derived datatypes for the exchange of ghost points in
940	!-- x- and y-direction for 2D-arrays (line)
941	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_REAL, type_x, &
942	ierr )
943	CALL MPI_TYPE_COMMIT( type_x, ierr )
944	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_INTEGER, &
945	type_x_int, ierr )
946	CALL MPI_TYPE_COMMIT( type_x_int, ierr )
947
948	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_REAL, type_y, ierr )
949	CALL MPI_TYPE_COMMIT( type_y, ierr )
950	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_INTEGER, type_y_int, ierr )
951	CALL MPI_TYPE_COMMIT( type_y_int, ierr )
952
953
954	!
955	!-- Calculate gridpoint numbers for the exchange of ghost points along x
956	!-- (yz-plane for 3D-arrays) and define MPI derived data type(s) for the
957	!-- exchange of ghost points in y-direction (xz-plane).
958	!-- Do these calculations for the model grid and (if necessary) also
959	!-- for the coarser grid levels used in the multigrid method
960	ALLOCATE ( ngp_yz(0:maximum_grid_level), type_xz(0:maximum_grid_level),&
961	type_yz(0:maximum_grid_level) )
962
963	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzb_l = nzb; nzt_l = nzt
964
965	!
966	!-- Discern between the model grid, which needs nbgp ghost points and
967	!-- grid levels for the multigrid scheme. In the latter case only one
968	!-- ghost point is necessary.
969	!-- First definition of MPI-datatypes for exchange of ghost layers on normal
970	!-- grid. The following loop is needed for data exchange in poismg.f90.
971	!
972	!-- Determine number of grid points of yz-layer for exchange
973	ngp_yz(0) = (nzt - nzb + 2) * (nyn - nys + 1 + 2 * nbgp)
974
975	!
976	!-- Define an MPI-datatype for the exchange of left/right boundaries.
977	!-- Although data are contiguous in physical memory (which does not
978	!-- necessarily require an MPI-derived datatype), the data exchange between
979	!-- left and right PE's using the MPI-derived type is 10% faster than without.
980	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2nbgp, nbgp(nzt-nzb+2), ngp_yz(0), &
981	MPI_REAL, type_xz(0), ierr )
982	CALL MPI_TYPE_COMMIT( type_xz(0), ierr )
983
984	CALL MPI_TYPE_VECTOR( nbgp, ngp_yz(0), ngp_yz(0), MPI_REAL, type_yz(0), &
985	ierr )
986	CALL MPI_TYPE_COMMIT( type_yz(0), ierr )
987
988	!
989	!-- Definition of MPI-datatypes for multigrid method (coarser level grids)
990	IF ( psolver == 'multigrid' ) THEN
991	!
992	!-- Definition of MPI-datatyoe as above, but only 1 ghost level is used
993	DO i = maximum_grid_level, 1 , -1
994
995	ngp_yz(i) = (nzt_l - nzb_l + 2) * (nyn_l - nys_l + 3)
996
997	CALL MPI_TYPE_VECTOR( nxr_l-nxl_l+3, nzt_l-nzb_l+2, ngp_yz(i), &
998	MPI_REAL, type_xz(i), ierr )
999	CALL MPI_TYPE_COMMIT( type_xz(i), ierr )
1000
1001	CALL MPI_TYPE_VECTOR( 1, ngp_yz(i), ngp_yz(i), MPI_REAL, type_yz(i), &
1002	ierr )
1003	CALL MPI_TYPE_COMMIT( type_yz(i), ierr )
1004
1005	nxl_l = nxl_l / 2
1006	nxr_l = nxr_l / 2
1007	nys_l = nys_l / 2
1008	nyn_l = nyn_l / 2
1009	nzt_l = nzt_l / 2
1010
1011	ENDDO
1012
1013	ENDIF
1014	#endif
1015
1016	#if defined( __parallel ) && ! defined ( __check )
1017	!
1018	!-- Setting of flags for inflow/outflow conditions in case of non-cyclic
1019	!-- horizontal boundary conditions.
1020	IF ( pleft == MPI_PROC_NULL ) THEN
1021	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1022	inflow_l = .TRUE.
1023	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1024	outflow_l = .TRUE.
1025	ENDIF
1026	ENDIF
1027
1028	IF ( pright == MPI_PROC_NULL ) THEN
1029	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1030	outflow_r = .TRUE.
1031	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1032	inflow_r = .TRUE.
1033	ENDIF
1034	ENDIF
1035
1036	IF ( psouth == MPI_PROC_NULL ) THEN
1037	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1038	outflow_s = .TRUE.
1039	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1040	inflow_s = .TRUE.
1041	ENDIF
1042	ENDIF
1043
1044	IF ( pnorth == MPI_PROC_NULL ) THEN
1045	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1046	inflow_n = .TRUE.
1047	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1048	outflow_n = .TRUE.
1049	ENDIF
1050	ENDIF
1051
1052	!
1053	!-- Broadcast the id of the inflow PE
1054	IF ( inflow_l ) THEN
1055	id_inflow_l = myidx
1056	ELSE
1057	id_inflow_l = 0
1058	ENDIF
1059	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1060	CALL MPI_ALLREDUCE( id_inflow_l, id_inflow, 1, MPI_INTEGER, MPI_SUM, &
1061	comm1dx, ierr )
1062
1063	!
1064	!-- Broadcast the id of the recycling plane
1065	!-- WARNING: needs to be adjusted in case of inflows other than from left side!
1066	IF ( NINT( recycling_width / dx ) >= nxl .AND. &
1067	NINT( recycling_width / dx ) <= nxr ) THEN
1068	id_recycling_l = myidx
1069	ELSE
1070	id_recycling_l = 0
1071	ENDIF
1072	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1073	CALL MPI_ALLREDUCE( id_recycling_l, id_recycling, 1, MPI_INTEGER, MPI_SUM, &
1074	comm1dx, ierr )
1075
1076	CALL location_message( 'finished' )
1077
1078	#elif ! defined ( __parallel )
1079	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1080	inflow_l = .TRUE.
1081	outflow_r = .TRUE.
1082	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1083	outflow_l = .TRUE.
1084	inflow_r = .TRUE.
1085	ENDIF
1086
1087	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1088	inflow_n = .TRUE.
1089	outflow_s = .TRUE.
1090	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1091	outflow_n = .TRUE.
1092	inflow_s = .TRUE.
1093	ENDIF
1094	#endif
1095
1096	!
1097	!-- At the inflow or outflow, u or v, respectively, have to be calculated for
1098	!-- one more grid point.
1099	IF ( inflow_l .OR. outflow_l ) THEN
1100	nxlu = nxl + 1
1101	ELSE
1102	nxlu = nxl
1103	ENDIF
1104	IF ( inflow_s .OR. outflow_s ) THEN
1105	nysv = nys + 1
1106	ELSE
1107	nysv = nys
1108	ENDIF
1109
1110	!
1111	!-- Allocate wall flag arrays used in the multigrid solver
1112	IF ( psolver == 'multigrid' ) THEN
1113
1114	DO i = maximum_grid_level, 1, -1
1115
1116	SELECT CASE ( i )
1117
1118	CASE ( 1 )
1119	ALLOCATE( wall_flags_1(nzb:nzt_mg(i)+1, &
1120	nys_mg(i)-1:nyn_mg(i)+1, &
1121	nxl_mg(i)-1:nxr_mg(i)+1) )
1122
1123	CASE ( 2 )
1124	ALLOCATE( wall_flags_2(nzb:nzt_mg(i)+1, &
1125	nys_mg(i)-1:nyn_mg(i)+1, &
1126	nxl_mg(i)-1:nxr_mg(i)+1) )
1127
1128	CASE ( 3 )
1129	ALLOCATE( wall_flags_3(nzb:nzt_mg(i)+1, &
1130	nys_mg(i)-1:nyn_mg(i)+1, &
1131	nxl_mg(i)-1:nxr_mg(i)+1) )
1132
1133	CASE ( 4 )
1134	ALLOCATE( wall_flags_4(nzb:nzt_mg(i)+1, &
1135	nys_mg(i)-1:nyn_mg(i)+1, &
1136	nxl_mg(i)-1:nxr_mg(i)+1) )
1137
1138	CASE ( 5 )
1139	ALLOCATE( wall_flags_5(nzb:nzt_mg(i)+1, &
1140	nys_mg(i)-1:nyn_mg(i)+1, &
1141	nxl_mg(i)-1:nxr_mg(i)+1) )
1142
1143	CASE ( 6 )
1144	ALLOCATE( wall_flags_6(nzb:nzt_mg(i)+1, &
1145	nys_mg(i)-1:nyn_mg(i)+1, &
1146	nxl_mg(i)-1:nxr_mg(i)+1) )
1147
1148	CASE ( 7 )
1149	ALLOCATE( wall_flags_7(nzb:nzt_mg(i)+1, &
1150	nys_mg(i)-1:nyn_mg(i)+1, &
1151	nxl_mg(i)-1:nxr_mg(i)+1) )
1152
1153	CASE ( 8 )
1154	ALLOCATE( wall_flags_8(nzb:nzt_mg(i)+1, &
1155	nys_mg(i)-1:nyn_mg(i)+1, &
1156	nxl_mg(i)-1:nxr_mg(i)+1) )
1157
1158	CASE ( 9 )
1159	ALLOCATE( wall_flags_9(nzb:nzt_mg(i)+1, &
1160	nys_mg(i)-1:nyn_mg(i)+1, &
1161	nxl_mg(i)-1:nxr_mg(i)+1) )
1162
1163	CASE ( 10 )
1164	ALLOCATE( wall_flags_10(nzb:nzt_mg(i)+1, &
1165	nys_mg(i)-1:nyn_mg(i)+1, &
1166	nxl_mg(i)-1:nxr_mg(i)+1) )
1167
1168	CASE DEFAULT
1169	message_string = 'more than 10 multigrid levels'
1170	CALL message( 'init_pegrid', 'PA0238', 1, 2, 0, 6, 0 )
1171
1172	END SELECT
1173
1174	ENDDO
1175
1176	ENDIF
1177
1178	!
1179	!-- Calculate the number of groups into which parallel I/O is split.
1180	!-- The default for files which are opened by all PEs (or where each
1181	!-- PE opens his own independent file) is, that all PEs are doing input/output
1182	!-- in parallel at the same time. This might cause performance or even more
1183	!-- severe problems depending on the configuration of the underlying file
1184	!-- system.
1185	!-- First, set the default:
1186	IF ( maximum_parallel_io_streams == -1 .OR. &
1187	maximum_parallel_io_streams > numprocs ) THEN
1188	maximum_parallel_io_streams = numprocs
1189	ENDIF
1190
1191	!
1192	!-- Now calculate the number of io_blocks and the io_group to which the
1193	!-- respective PE belongs. I/O of the groups is done in serial, but in parallel
1194	!-- for all PEs belonging to the same group. A preliminary setting with myid
1195	!-- based on MPI_COMM_WORLD has been done in parin.
1196	io_blocks = numprocs / maximum_parallel_io_streams
1197	io_group = MOD( myid+1, io_blocks )
1198
1199
1200	END SUBROUTINE init_pegrid

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