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source: palm/trunk/SOURCE/init_pegrid.f90 @ 1367

Last change on this file since 1367 was 1354, checked in by heinze, 11 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 1354 2014-04-08 15:22:57Z witha $
27	!
28	! 1353 2014-04-08 15:21:23Z heinze
29	! REAL constants provided with KIND-attribute
30	!
31	! 1322 2014-03-20 16:38:49Z raasch
32	! REAL functions provided with KIND-attribute
33	!
34	! 1320 2014-03-20 08:40:49Z raasch
35	! ONLY-attribute added to USE-statements,
36	! kind-parameters added to all INTEGER and REAL declaration statements,
37	! kinds are defined in new module kinds,
38	! revision history before 2012 removed,
39	! comment fields (!:) to be used for variable explanations added to
40	! all variable declaration statements
41	!
42	! 1304 2014-03-12 10:29:42Z raasch
43	! bugfix: single core MPI runs missed some settings of transpose indices
44	!
45	! 1212 2013-08-15 08:46:27Z raasch
46	! error message for poisfft_hybrid removed
47	!
48	! 1159 2013-05-21 11:58:22Z fricke
49	! dirichlet/neumann and neumann/dirichlet removed
50	!
51	! 1139 2013-04-18 07:25:03Z raasch
52	! bugfix for calculating the id of the PE carrying the recycling plane
53	!
54	! 1111 2013-03-08 23:54:10Z raasch
55	! initialization of poisfft moved to module poisfft
56	!
57	! 1092 2013-02-02 11:24:22Z raasch
58	! unused variables removed
59	!
60	! 1056 2012-11-16 15:28:04Z raasch
61	! Indices for arrays n.._mg start from zero due to definition of arrays f2 and
62	! p2 as automatic arrays in recursive subroutine next_mg_level
63	!
64	! 1041 2012-11-06 02:36:29Z raasch
65	! a 2d virtual processor topology is used by default for all machines
66	!
67	! 1036 2012-10-22 13:43:42Z raasch
68	! code put under GPL (PALM 3.9)
69	!
70	! 1003 2012-09-14 14:35:53Z raasch
71	! subdomains must have identical size (grid matching = "match" removed)
72	!
73	! 1001 2012-09-13 14:08:46Z raasch
74	! all actions concerning upstream-spline-method removed
75	!
76	! 978 2012-08-09 08:28:32Z fricke
77	! dirichlet/neumann and neumann/dirichlet added
78	! nxlu and nysv are also calculated for inflow boundary
79	!
80	! 809 2012-01-30 13:32:58Z maronga
81	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
82	!
83	! 807 2012-01-25 11:53:51Z maronga
84	! New cpp directive "__check" implemented which is used by check_namelist_files
85	!
86	! Revision 1.1 1997/07/24 11:15:09 raasch
87	! Initial revision
88	!
89	!
90	! Description:
91	! ------------
92	! Determination of the virtual processor topology (if not prescribed by the
93	! user)and computation of the grid point number and array bounds of the local
94	! domains.
95	!------------------------------------------------------------------------------!
96
97	USE control_parameters, &
98	ONLY: bc_lr, bc_ns, coupling_mode, coupling_topology, dt_dosp, &
99	gathered_size, grid_level, grid_level_count, host, inflow_l, &
100	inflow_n, inflow_r, inflow_s, io_blocks, io_group, &
101	maximum_grid_level, maximum_parallel_io_streams, message_string,&
102	mg_switch_to_pe0_level, momentum_advec, psolver, outflow_l, &
103	outflow_n, outflow_r, outflow_s, recycling_width, scalar_advec, &
104	subdomain_size
105
106	USE grid_variables, &
107	ONLY: dx
108
109	USE indices, &
110	ONLY: mg_loc_ind, nbgp, nnx, nny, nnz, nx, nx_a, nx_o, nxl, nxl_mg, &
111	nxlu, nxr, nxr_mg, ny, ny_a, ny_o, nyn, nyn_mg, nys, nys_mg, &
112	nysv, nz, nzb, nzt, nzt_mg, wall_flags_1, wall_flags_2, &
113	wall_flags_3, wall_flags_4, wall_flags_5, wall_flags_6, &
114	wall_flags_7, wall_flags_8, wall_flags_9, wall_flags_10
115
116	USE kinds
117
118	USE pegrid
119
120	USE transpose_indices, &
121	ONLY: nxl_y, nxl_yd, nxl_z, nxr_y, nxr_yd, nxr_z, nyn_x, nyn_z, nys_x,&
122	nys_z, nzb_x, nzb_y, nzb_yd, nzt_x, nzt_yd, nzt_y
123
124	IMPLICIT NONE
125
126	INTEGER(iwp) :: i !:
127	INTEGER(iwp) :: id_inflow_l !:
128	INTEGER(iwp) :: id_recycling_l !:
129	INTEGER(iwp) :: ind(5) !:
130	INTEGER(iwp) :: j !:
131	INTEGER(iwp) :: k !:
132	INTEGER(iwp) :: maximum_grid_level_l !:
133	INTEGER(iwp) :: mg_levels_x !:
134	INTEGER(iwp) :: mg_levels_y !:
135	INTEGER(iwp) :: mg_levels_z !:
136	INTEGER(iwp) :: mg_switch_to_pe0_level_l !:
137	INTEGER(iwp) :: nnx_y !:
138	INTEGER(iwp) :: nnx_z !:
139	INTEGER(iwp) :: nny_x !:
140	INTEGER(iwp) :: nny_z !:
141	INTEGER(iwp) :: nnz_x !:
142	INTEGER(iwp) :: nnz_y !:
143	INTEGER(iwp) :: numproc_sqr !:
144	INTEGER(iwp) :: nxl_l !:
145	INTEGER(iwp) :: nxr_l !:
146	INTEGER(iwp) :: nyn_l !:
147	INTEGER(iwp) :: nys_l !:
148	INTEGER(iwp) :: nzb_l !:
149	INTEGER(iwp) :: nzt_l !:
150	INTEGER(iwp) :: omp_get_num_threads !:
151
152	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: ind_all !:
153	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxlf !:
154	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxrf !:
155	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nynf !:
156	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nysf !:
157
158	INTEGER(iwp), DIMENSION(2) :: pdims_remote !:
159
160	#if defined( __mpi2 )
161	LOGICAL :: found !:
162	#endif
163
164	!
165	!-- Get the number of OpenMP threads
166	!$OMP PARALLEL
167	#if defined( __intel_openmp_bug )
168	threads_per_task = omp_get_num_threads()
169	#else
170	!$ threads_per_task = omp_get_num_threads()
171	#endif
172	!$OMP END PARALLEL
173
174
175	#if defined( __parallel )
176
177	!
178	!-- Determine the processor topology or check it, if prescribed by the user
179	IF ( npex == -1 .AND. npey == -1 ) THEN
180
181	!
182	!-- Automatic determination of the topology
183	numproc_sqr = SQRT( REAL( numprocs, KIND=wp ) )
184	pdims(1) = MAX( numproc_sqr , 1 )
185	DO WHILE ( MOD( numprocs , pdims(1) ) /= 0 )
186	pdims(1) = pdims(1) - 1
187	ENDDO
188	pdims(2) = numprocs / pdims(1)
189
190	ELSEIF ( npex /= -1 .AND. npey /= -1 ) THEN
191
192	!
193	!-- Prescribed by user. Number of processors on the prescribed topology
194	!-- must be equal to the number of PEs available to the job
195	IF ( ( npex * npey ) /= numprocs ) THEN
196	WRITE( message_string, * ) 'number of PEs of the prescribed ', &
197	'topology (', npex*npey,') does not match & the number of ', &
198	'PEs available to the job (', numprocs, ')'
199	CALL message( 'init_pegrid', 'PA0221', 1, 2, 0, 6, 0 )
200	ENDIF
201	pdims(1) = npex
202	pdims(2) = npey
203
204	ELSE
205	!
206	!-- If the processor topology is prescribed by the user, the number of
207	!-- PEs must be given in both directions
208	message_string = 'if the processor topology is prescribed by the, ' // &
209	' user& both values of "npex" and "npey" must be given ' // &
210	'in the &NAMELIST-parameter file'
211	CALL message( 'init_pegrid', 'PA0222', 1, 2, 0, 6, 0 )
212
213	ENDIF
214
215	!
216	!-- For communication speedup, set barriers in front of collective
217	!-- communications by default on SGI-type systems
218	IF ( host(3:5) == 'sgi' ) collective_wait = .TRUE.
219
220	!
221	!-- If necessary, set horizontal boundary conditions to non-cyclic
222	IF ( bc_lr /= 'cyclic' ) cyclic(1) = .FALSE.
223	IF ( bc_ns /= 'cyclic' ) cyclic(2) = .FALSE.
224
225
226	#if ! defined( __check)
227	!
228	!-- Create the virtual processor grid
229	CALL MPI_CART_CREATE( comm_palm, ndim, pdims, cyclic, reorder, &
230	comm2d, ierr )
231	CALL MPI_COMM_RANK( comm2d, myid, ierr )
232	WRITE (myid_char,'(''_'',I4.4)') myid
233
234	CALL MPI_CART_COORDS( comm2d, myid, ndim, pcoord, ierr )
235	CALL MPI_CART_SHIFT( comm2d, 0, 1, pleft, pright, ierr )
236	CALL MPI_CART_SHIFT( comm2d, 1, 1, psouth, pnorth, ierr )
237
238	!
239	!-- Determine sub-topologies for transpositions
240	!-- Transposition from z to x:
241	remain_dims(1) = .TRUE.
242	remain_dims(2) = .FALSE.
243	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dx, ierr )
244	CALL MPI_COMM_RANK( comm1dx, myidx, ierr )
245	!
246	!-- Transposition from x to y
247	remain_dims(1) = .FALSE.
248	remain_dims(2) = .TRUE.
249	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dy, ierr )
250	CALL MPI_COMM_RANK( comm1dy, myidy, ierr )
251
252	#endif
253
254	!
255	!-- Calculate array bounds along x-direction for every PE.
256	ALLOCATE( nxlf(0:pdims(1)-1), nxrf(0:pdims(1)-1), nynf(0:pdims(2)-1), &
257	nysf(0:pdims(2)-1) )
258
259	IF ( MOD( nx+1 , pdims(1) ) /= 0 ) THEN
260	WRITE( message_string, * ) 'x-direction: gridpoint number (',nx+1,') ',&
261	'is not an& integral divisor of the number ', &
262	'processors (', pdims(1),')'
263	CALL message( 'init_pegrid', 'PA0225', 1, 2, 0, 6, 0 )
264	ELSE
265	nnx = ( nx + 1 ) / pdims(1)
266	IF ( nnx*pdims(1) - ( nx + 1) > nnx ) THEN
267	WRITE( message_string, * ) 'x-direction: nx does not match the', &
268	'requirements given by the number of PEs &used', &
269	'& please use nx = ', nx - ( pdims(1) - ( nnx*pdims(1) &
270	- ( nx + 1 ) ) ), ' instead of nx =', nx
271	CALL message( 'init_pegrid', 'PA0226', 1, 2, 0, 6, 0 )
272	ENDIF
273	ENDIF
274
275	!
276	!-- Left and right array bounds, number of gridpoints
277	DO i = 0, pdims(1)-1
278	nxlf(i) = i * nnx
279	nxrf(i) = ( i + 1 ) * nnx - 1
280	ENDDO
281
282	!
283	!-- Calculate array bounds in y-direction for every PE.
284	IF ( MOD( ny+1 , pdims(2) ) /= 0 ) THEN
285	WRITE( message_string, * ) 'y-direction: gridpoint number (',ny+1,') ', &
286	'is not an& integral divisor of the number of', &
287	'processors (', pdims(2),')'
288	CALL message( 'init_pegrid', 'PA0227', 1, 2, 0, 6, 0 )
289	ELSE
290	nny = ( ny + 1 ) / pdims(2)
291	IF ( nny*pdims(2) - ( ny + 1) > nny ) THEN
292	WRITE( message_string, * ) 'y-direction: ny does not match the', &
293	'requirements given by the number of PEs &used ', &
294	'& please use ny = ', ny - ( pdims(2) - ( nnx*pdims(2) &
295	- ( ny + 1 ) ) ), ' instead of ny =', ny
296	CALL message( 'init_pegrid', 'PA0228', 1, 2, 0, 6, 0 )
297	ENDIF
298	ENDIF
299
300	!
301	!-- South and north array bounds
302	DO j = 0, pdims(2)-1
303	nysf(j) = j * nny
304	nynf(j) = ( j + 1 ) * nny - 1
305	ENDDO
306
307	!
308	!-- Local array bounds of the respective PEs
309	nxl = nxlf(pcoord(1))
310	nxr = nxrf(pcoord(1))
311	nys = nysf(pcoord(2))
312	nyn = nynf(pcoord(2))
313	nzb = 0
314	nzt = nz
315	nnz = nz
316
317	!
318	!-- Set switches to define if the PE is situated at the border of the virtual
319	!-- processor grid
320	IF ( nxl == 0 ) left_border_pe = .TRUE.
321	IF ( nxr == nx ) right_border_pe = .TRUE.
322	IF ( nys == 0 ) south_border_pe = .TRUE.
323	IF ( nyn == ny ) north_border_pe = .TRUE.
324
325	!
326	!-- Calculate array bounds and gridpoint numbers for the transposed arrays
327	!-- (needed in the pressure solver)
328	!-- For the transposed arrays, cyclic boundaries as well as top and bottom
329	!-- boundaries are omitted, because they are obstructive to the transposition
330
331	!
332	!-- 1. transposition z --> x
333	!-- This transposition is not neccessary in case of a 1d-decomposition along x
334	nys_x = nys
335	nyn_x = nyn
336	nny_x = nny
337	nnz_x = nz / pdims(1)
338	nzb_x = 1 + myidx * nnz_x
339	nzt_x = ( myidx + 1 ) * nnz_x
340	sendrecvcount_zx = nnx * nny * nnz_x
341
342	IF ( pdims(2) /= 1 ) THEN
343	IF ( MOD( nz , pdims(1) ) /= 0 ) THEN
344	WRITE( message_string, * ) 'transposition z --> x:', &
345	'&nz=',nz,' is not an integral divisior of pdims(1)=', &
346	pdims(1)
347	CALL message( 'init_pegrid', 'PA0230', 1, 2, 0, 6, 0 )
348	ENDIF
349	ENDIF
350
351	!
352	!-- 2. transposition x --> y
353	nnz_y = nnz_x
354	nzb_y = nzb_x
355	nzt_y = nzt_x
356	IF ( MOD( nx+1 , pdims(2) ) /= 0 ) THEN
357	WRITE( message_string, * ) 'transposition x --> y:', &
358	'&nx+1=',nx+1,' is not an integral divisor of ',&
359	'pdims(2)=',pdims(2)
360	CALL message( 'init_pegrid', 'PA0231', 1, 2, 0, 6, 0 )
361	ENDIF
362	nnx_y = (nx+1) / pdims(2)
363	nxl_y = myidy * nnx_y
364	nxr_y = ( myidy + 1 ) * nnx_y - 1
365	sendrecvcount_xy = nnx_y * nny_x * nnz_y
366
367	!
368	!-- 3. transposition y --> z (ELSE: x --> y in case of 1D-decomposition
369	!-- along x)
370	nnx_z = nnx_y
371	nxl_z = nxl_y
372	nxr_z = nxr_y
373	nny_z = (ny+1) / pdims(1)
374	nys_z = myidx * nny_z
375	nyn_z = ( myidx + 1 ) * nny_z - 1
376	sendrecvcount_yz = nnx_y * nny_z * nnz_y
377
378	IF ( pdims(2) /= 1 ) THEN
379	!
380	!-- y --> z
381	!-- This transposition is not neccessary in case of a 1d-decomposition
382	!-- along x, except that the uptream-spline method is switched on
383	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
384	WRITE( message_string, * ) 'transposition y --> z:', &
385	'& ny+1=',ny+1,' is not an integral divisor of ',&
386	'pdims(1)=',pdims(1)
387	CALL message( 'init_pegrid', 'PA0232', 1, 2, 0, 6, 0 )
388	ENDIF
389
390	ELSE
391	!
392	!-- x --> y. This condition must be fulfilled for a 1D-decomposition along x
393	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
394	WRITE( message_string, * ) 'transposition x --> y:', &
395	'& ny+1=',ny+1,' is not an integral divisor of ',&
396	'pdims(1)=',pdims(1)
397	CALL message( 'init_pegrid', 'PA0233', 1, 2, 0, 6, 0 )
398	ENDIF
399
400	ENDIF
401
402	!
403	!-- Indices for direct transpositions z --> y (used for calculating spectra)
404	IF ( dt_dosp /= 9999999.9_wp ) THEN
405	IF ( MOD( nz, pdims(2) ) /= 0 ) THEN
406	WRITE( message_string, * ) 'direct transposition z --> y (needed ', &
407	'for spectra):& nz=',nz,' is not an integral divisor of ',&
408	'pdims(2)=',pdims(2)
409	CALL message( 'init_pegrid', 'PA0234', 1, 2, 0, 6, 0 )
410	ELSE
411	nxl_yd = nxl
412	nxr_yd = nxr
413	nzb_yd = 1 + myidy * ( nz / pdims(2) )
414	nzt_yd = ( myidy + 1 ) * ( nz / pdims(2) )
415	sendrecvcount_zyd = nnx * nny * ( nz / pdims(2) )
416	ENDIF
417	ENDIF
418
419	!
420	!-- Indices for direct transpositions y --> x (they are only possible in case
421	!-- of a 1d-decomposition along x)
422	IF ( pdims(2) == 1 ) THEN
423	nny_x = nny / pdims(1)
424	nys_x = myid * nny_x
425	nyn_x = ( myid + 1 ) * nny_x - 1
426	nzb_x = 1
427	nzt_x = nz
428	sendrecvcount_xy = nnx * nny_x * nz
429	ENDIF
430
431	!
432	!-- Indices for direct transpositions x --> y (they are only possible in case
433	!-- of a 1d-decomposition along y)
434	IF ( pdims(1) == 1 ) THEN
435	nnx_y = nnx / pdims(2)
436	nxl_y = myid * nnx_y
437	nxr_y = ( myid + 1 ) * nnx_y - 1
438	nzb_y = 1
439	nzt_y = nz
440	sendrecvcount_xy = nnx_y * nny * nz
441	ENDIF
442
443	!
444	!-- Arrays for storing the array bounds are needed any more
445	DEALLOCATE( nxlf , nxrf , nynf , nysf )
446
447
448	#if ! defined( __check)
449	!
450	!-- Collect index bounds from other PEs (to be written to restart file later)
451	ALLOCATE( hor_index_bounds(4,0:numprocs-1) )
452
453	IF ( myid == 0 ) THEN
454
455	hor_index_bounds(1,0) = nxl
456	hor_index_bounds(2,0) = nxr
457	hor_index_bounds(3,0) = nys
458	hor_index_bounds(4,0) = nyn
459
460	!
461	!-- Receive data from all other PEs
462	DO i = 1, numprocs-1
463	CALL MPI_RECV( ibuf, 4, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
464	ierr )
465	hor_index_bounds(:,i) = ibuf(1:4)
466	ENDDO
467
468	ELSE
469	!
470	!-- Send index bounds to PE0
471	ibuf(1) = nxl
472	ibuf(2) = nxr
473	ibuf(3) = nys
474	ibuf(4) = nyn
475	CALL MPI_SEND( ibuf, 4, MPI_INTEGER, 0, myid, comm2d, ierr )
476
477	ENDIF
478
479	#endif
480
481	#if defined( __print )
482	!
483	!-- Control output
484	IF ( myid == 0 ) THEN
485	PRINT, ' processor topology *'
486	PRINT*, ' '
487	PRINT*, 'myid pcoord left right south north idx idy nxl: nxr',&
488	&' nys: nyn'
489	PRINT*, '------------------------------------------------------------',&
490	&'-----------'
491	WRITE (*,1000) 0, pcoord(1), pcoord(2), pleft, pright, psouth, pnorth, &
492	myidx, myidy, nxl, nxr, nys, nyn
493	1000 FORMAT (I4,2X,'(',I3,',',I3,')',3X,I4,2X,I4,3X,I4,2X,I4,2X,I3,1X,I3, &
494	2(2X,I4,':',I4))
495
496	!
497	!-- Receive data from the other PEs
498	DO i = 1,numprocs-1
499	CALL MPI_RECV( ibuf, 12, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
500	ierr )
501	WRITE (*,1000) i, ( ibuf(j) , j = 1,12 )
502	ENDDO
503	ELSE
504
505	!
506	!-- Send data to PE0
507	ibuf(1) = pcoord(1); ibuf(2) = pcoord(2); ibuf(3) = pleft
508	ibuf(4) = pright; ibuf(5) = psouth; ibuf(6) = pnorth; ibuf(7) = myidx
509	ibuf(8) = myidy; ibuf(9) = nxl; ibuf(10) = nxr; ibuf(11) = nys
510	ibuf(12) = nyn
511	CALL MPI_SEND( ibuf, 12, MPI_INTEGER, 0, myid, comm2d, ierr )
512	ENDIF
513	#endif
514
515	#if defined( __parallel ) && ! defined( __check)
516	#if defined( __mpi2 )
517	!
518	!-- In case of coupled runs, get the port name on PE0 of the atmosphere model
519	!-- and pass it to PE0 of the ocean model
520	IF ( myid == 0 ) THEN
521
522	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
523
524	CALL MPI_OPEN_PORT( MPI_INFO_NULL, port_name, ierr )
525
526	CALL MPI_PUBLISH_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, &
527	ierr )
528
529	!
530	!-- Write a flag file for the ocean model and the other atmosphere
531	!-- processes.
532	!-- There seems to be a bug in MPICH2 which causes hanging processes
533	!-- in case that execution of LOOKUP_NAME is continued too early
534	!-- (i.e. before the port has been created)
535	OPEN( 90, FILE='COUPLING_PORT_OPENED', FORM='FORMATTED' )
536	WRITE ( 90, '(''TRUE'')' )
537	CLOSE ( 90 )
538
539	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
540
541	!
542	!-- Continue only if the atmosphere model has created the port.
543	!-- There seems to be a bug in MPICH2 which causes hanging processes
544	!-- in case that execution of LOOKUP_NAME is continued too early
545	!-- (i.e. before the port has been created)
546	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
547	DO WHILE ( .NOT. found )
548	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
549	ENDDO
550
551	CALL MPI_LOOKUP_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, ierr )
552
553	ENDIF
554
555	ENDIF
556
557	!
558	!-- In case of coupled runs, establish the connection between the atmosphere
559	!-- and the ocean model and define the intercommunicator (comm_inter)
560	CALL MPI_BARRIER( comm2d, ierr )
561	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
562
563	CALL MPI_COMM_ACCEPT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
564	comm_inter, ierr )
565	coupling_mode_remote = 'ocean_to_atmosphere'
566
567	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
568
569	CALL MPI_COMM_CONNECT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
570	comm_inter, ierr )
571	coupling_mode_remote = 'atmosphere_to_ocean'
572
573	ENDIF
574	#endif
575
576	!
577	!-- Determine the number of ghost point layers
578	IF ( scalar_advec == 'ws-scheme' .OR. momentum_advec == 'ws-scheme' ) THEN
579	nbgp = 3
580	ELSE
581	nbgp = 1
582	ENDIF
583
584	!
585	!-- Create a new MPI derived datatype for the exchange of surface (xy) data,
586	!-- which is needed for coupled atmosphere-ocean runs.
587	!-- First, calculate number of grid points of an xy-plane.
588	ngp_xy = ( nxr - nxl + 1 + 2 * nbgp ) * ( nyn - nys + 1 + 2 * nbgp )
589	CALL MPI_TYPE_VECTOR( ngp_xy, 1, nzt-nzb+2, MPI_REAL, type_xy, ierr )
590	CALL MPI_TYPE_COMMIT( type_xy, ierr )
591
592	IF ( TRIM( coupling_mode ) /= 'uncoupled' ) THEN
593
594	!
595	!-- Pass the number of grid points of the atmosphere model to
596	!-- the ocean model and vice versa
597	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
598
599	nx_a = nx
600	ny_a = ny
601
602	IF ( myid == 0 ) THEN
603
604	CALL MPI_SEND( nx_a, 1, MPI_INTEGER, numprocs, 1, comm_inter, &
605	ierr )
606	CALL MPI_SEND( ny_a, 1, MPI_INTEGER, numprocs, 2, comm_inter, &
607	ierr )
608	CALL MPI_SEND( pdims, 2, MPI_INTEGER, numprocs, 3, comm_inter, &
609	ierr )
610	CALL MPI_RECV( nx_o, 1, MPI_INTEGER, numprocs, 4, comm_inter, &
611	status, ierr )
612	CALL MPI_RECV( ny_o, 1, MPI_INTEGER, numprocs, 5, comm_inter, &
613	status, ierr )
614	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, numprocs, 6, &
615	comm_inter, status, ierr )
616	ENDIF
617
618	CALL MPI_BCAST( nx_o, 1, MPI_INTEGER, 0, comm2d, ierr )
619	CALL MPI_BCAST( ny_o, 1, MPI_INTEGER, 0, comm2d, ierr )
620	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr )
621
622	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
623
624	nx_o = nx
625	ny_o = ny
626
627	IF ( myid == 0 ) THEN
628
629	CALL MPI_RECV( nx_a, 1, MPI_INTEGER, 0, 1, comm_inter, status, &
630	ierr )
631	CALL MPI_RECV( ny_a, 1, MPI_INTEGER, 0, 2, comm_inter, status, &
632	ierr )
633	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, 0, 3, comm_inter, &
634	status, ierr )
635	CALL MPI_SEND( nx_o, 1, MPI_INTEGER, 0, 4, comm_inter, ierr )
636	CALL MPI_SEND( ny_o, 1, MPI_INTEGER, 0, 5, comm_inter, ierr )
637	CALL MPI_SEND( pdims, 2, MPI_INTEGER, 0, 6, comm_inter, ierr )
638	ENDIF
639
640	CALL MPI_BCAST( nx_a, 1, MPI_INTEGER, 0, comm2d, ierr)
641	CALL MPI_BCAST( ny_a, 1, MPI_INTEGER, 0, comm2d, ierr)
642	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr)
643
644	ENDIF
645
646	ngp_a = ( nx_a+1 + 2 * nbgp ) * ( ny_a+1 + 2 * nbgp )
647	ngp_o = ( nx_o+1 + 2 * nbgp ) * ( ny_o+1 + 2 * nbgp )
648
649	!
650	!-- Determine if the horizontal grid and the number of PEs in ocean and
651	!-- atmosphere is same or not
652	IF ( nx_o == nx_a .AND. ny_o == ny_a .AND. &
653	pdims(1) == pdims_remote(1) .AND. pdims(2) == pdims_remote(2) ) &
654	THEN
655	coupling_topology = 0
656	ELSE
657	coupling_topology = 1
658	ENDIF
659
660	!
661	!-- Determine the target PEs for the exchange between ocean and
662	!-- atmosphere (comm2d)
663	IF ( coupling_topology == 0 ) THEN
664	!
665	!-- In case of identical topologies, every atmosphere PE has exactly one
666	!-- ocean PE counterpart and vice versa
667	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
668	target_id = myid + numprocs
669	ELSE
670	target_id = myid
671	ENDIF
672
673	ELSE
674	!
675	!-- In case of nonequivalent topology in ocean and atmosphere only for
676	!-- PE0 in ocean and PE0 in atmosphere a target_id is needed, since
677	!-- data echxchange between ocean and atmosphere will be done only
678	!-- between these PEs.
679	IF ( myid == 0 ) THEN
680
681	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
682	target_id = numprocs
683	ELSE
684	target_id = 0
685	ENDIF
686
687	ENDIF
688
689	ENDIF
690
691	ENDIF
692
693
694	#endif
695
696	#else
697
698	!
699	!-- Array bounds when running on a single PE (respectively a non-parallel
700	!-- machine)
701	nxl = 0
702	nxr = nx
703	nnx = nxr - nxl + 1
704	nys = 0
705	nyn = ny
706	nny = nyn - nys + 1
707	nzb = 0
708	nzt = nz
709	nnz = nz
710
711	ALLOCATE( hor_index_bounds(4,0:0) )
712	hor_index_bounds(1,0) = nxl
713	hor_index_bounds(2,0) = nxr
714	hor_index_bounds(3,0) = nys
715	hor_index_bounds(4,0) = nyn
716
717	!
718	!-- Array bounds for the pressure solver (in the parallel code, these bounds
719	!-- are the ones for the transposed arrays)
720	nys_x = nys
721	nyn_x = nyn
722	nzb_x = nzb + 1
723	nzt_x = nzt
724
725	nxl_y = nxl
726	nxr_y = nxr
727	nzb_y = nzb + 1
728	nzt_y = nzt
729
730	nxl_z = nxl
731	nxr_z = nxr
732	nys_z = nys
733	nyn_z = nyn
734
735	#endif
736
737	!
738	!-- Calculate number of grid levels necessary for the multigrid poisson solver
739	!-- as well as the gridpoint indices on each level
740	IF ( psolver == 'multigrid' ) THEN
741
742	!
743	!-- First calculate number of possible grid levels for the subdomains
744	mg_levels_x = 1
745	mg_levels_y = 1
746	mg_levels_z = 1
747
748	i = nnx
749	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
750	i = i / 2
751	mg_levels_x = mg_levels_x + 1
752	ENDDO
753
754	j = nny
755	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
756	j = j / 2
757	mg_levels_y = mg_levels_y + 1
758	ENDDO
759
760	k = nz ! do not use nnz because it might be > nz due to transposition
761	! requirements
762	DO WHILE ( MOD( k, 2 ) == 0 .AND. k /= 2 )
763	k = k / 2
764	mg_levels_z = mg_levels_z + 1
765	ENDDO
766
767	maximum_grid_level = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
768
769	!
770	!-- Find out, if the total domain allows more levels. These additional
771	!-- levels are identically processed on all PEs.
772	IF ( numprocs > 1 .AND. mg_switch_to_pe0_level /= -1 ) THEN
773
774	IF ( mg_levels_z > MIN( mg_levels_x, mg_levels_y ) ) THEN
775
776	mg_switch_to_pe0_level_l = maximum_grid_level
777
778	mg_levels_x = 1
779	mg_levels_y = 1
780
781	i = nx+1
782	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
783	i = i / 2
784	mg_levels_x = mg_levels_x + 1
785	ENDDO
786
787	j = ny+1
788	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
789	j = j / 2
790	mg_levels_y = mg_levels_y + 1
791	ENDDO
792
793	maximum_grid_level_l = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
794
795	IF ( maximum_grid_level_l > mg_switch_to_pe0_level_l ) THEN
796	mg_switch_to_pe0_level_l = maximum_grid_level_l - &
797	mg_switch_to_pe0_level_l + 1
798	ELSE
799	mg_switch_to_pe0_level_l = 0
800	ENDIF
801
802	ELSE
803	mg_switch_to_pe0_level_l = 0
804	maximum_grid_level_l = maximum_grid_level
805
806	ENDIF
807
808	!
809	!-- Use switch level calculated above only if it is not pre-defined
810	!-- by user
811	IF ( mg_switch_to_pe0_level == 0 ) THEN
812	IF ( mg_switch_to_pe0_level_l /= 0 ) THEN
813	mg_switch_to_pe0_level = mg_switch_to_pe0_level_l
814	maximum_grid_level = maximum_grid_level_l
815	ENDIF
816
817	ELSE
818	!
819	!-- Check pre-defined value and reset to default, if neccessary
820	IF ( mg_switch_to_pe0_level < mg_switch_to_pe0_level_l .OR. &
821	mg_switch_to_pe0_level >= maximum_grid_level_l ) THEN
822	message_string = 'mg_switch_to_pe0_level ' // &
823	'out of range and reset to default (=0)'
824	CALL message( 'init_pegrid', 'PA0235', 0, 1, 0, 6, 0 )
825	mg_switch_to_pe0_level = 0
826	ELSE
827	!
828	!-- Use the largest number of possible levels anyway and recalculate
829	!-- the switch level to this largest number of possible values
830	maximum_grid_level = maximum_grid_level_l
831
832	ENDIF
833
834	ENDIF
835
836	ENDIF
837
838	ALLOCATE( grid_level_count(maximum_grid_level), &
839	nxl_mg(0:maximum_grid_level), nxr_mg(0:maximum_grid_level), &
840	nyn_mg(0:maximum_grid_level), nys_mg(0:maximum_grid_level), &
841	nzt_mg(0:maximum_grid_level) )
842
843	grid_level_count = 0
844	!
845	!-- Index zero required as dummy due to definition of arrays f2 and p2 in
846	!-- recursive subroutine next_mg_level
847	nxl_mg(0) = 0; nxr_mg(0) = 0; nyn_mg(0) = 0; nys_mg(0) = 0; nzt_mg(0) = 0
848
849	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzt_l = nzt
850
851	DO i = maximum_grid_level, 1 , -1
852
853	IF ( i == mg_switch_to_pe0_level ) THEN
854	#if defined( __parallel ) && ! defined( __check )
855	!
856	!-- Save the grid size of the subdomain at the switch level, because
857	!-- it is needed in poismg.
858	ind(1) = nxl_l; ind(2) = nxr_l
859	ind(3) = nys_l; ind(4) = nyn_l
860	ind(5) = nzt_l
861	ALLOCATE( ind_all(5*numprocs), mg_loc_ind(5,0:numprocs-1) )
862	CALL MPI_ALLGATHER( ind, 5, MPI_INTEGER, ind_all, 5, &
863	MPI_INTEGER, comm2d, ierr )
864	DO j = 0, numprocs-1
865	DO k = 1, 5
866	mg_loc_ind(k,j) = ind_all(k+j*5)
867	ENDDO
868	ENDDO
869	DEALLOCATE( ind_all )
870	!
871	!-- Calculate the grid size of the total domain
872	nxr_l = ( nxr_l-nxl_l+1 ) * pdims(1) - 1
873	nxl_l = 0
874	nyn_l = ( nyn_l-nys_l+1 ) * pdims(2) - 1
875	nys_l = 0
876	!
877	!-- The size of this gathered array must not be larger than the
878	!-- array tend, which is used in the multigrid scheme as a temporary
879	!-- array. Therefore the subdomain size of an PE is calculated and
880	!-- the size of the gathered grid. These values are used in
881	!-- routines pres and poismg
882	subdomain_size = ( nxr - nxl + 2 * nbgp + 1 ) * &
883	( nyn - nys + 2 * nbgp + 1 ) * ( nzt - nzb + 2 )
884	gathered_size = ( nxr_l - nxl_l + 3 ) * ( nyn_l - nys_l + 3 ) * &
885	( nzt_l - nzb + 2 )
886
887	#elif ! defined ( __parallel )
888	message_string = 'multigrid gather/scatter impossible ' // &
889	'in non parallel mode'
890	CALL message( 'init_pegrid', 'PA0237', 1, 2, 0, 6, 0 )
891	#endif
892	ENDIF
893
894	nxl_mg(i) = nxl_l
895	nxr_mg(i) = nxr_l
896	nys_mg(i) = nys_l
897	nyn_mg(i) = nyn_l
898	nzt_mg(i) = nzt_l
899
900	nxl_l = nxl_l / 2
901	nxr_l = nxr_l / 2
902	nys_l = nys_l / 2
903	nyn_l = nyn_l / 2
904	nzt_l = nzt_l / 2
905
906	ENDDO
907
908	!
909	!-- Temporary problem: Currently calculation of maxerror iin routine poismg crashes
910	!-- if grid data are collected on PE0 already on the finest grid level.
911	!-- To be solved later.
912	IF ( maximum_grid_level == mg_switch_to_pe0_level ) THEN
913	message_string = 'grid coarsening on subdomain level cannot be performed'
914	CALL message( 'poismg', 'PA0236', 1, 2, 0, 6, 0 )
915	ENDIF
916
917	ELSE
918
919	maximum_grid_level = 0
920
921	ENDIF
922
923	!
924	!-- Default level 0 tells exchange_horiz that all ghost planes have to be
925	!-- exchanged. grid_level is adjusted in poismg, where only one ghost plane
926	!-- is required.
927	grid_level = 0
928
929	#if defined( __parallel ) && ! defined ( __check )
930	!
931	!-- Gridpoint number for the exchange of ghost points (y-line for 2D-arrays)
932	ngp_y = nyn - nys + 1 + 2 * nbgp
933
934	!
935	!-- Define new MPI derived datatypes for the exchange of ghost points in
936	!-- x- and y-direction for 2D-arrays (line)
937	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_REAL, type_x, &
938	ierr )
939	CALL MPI_TYPE_COMMIT( type_x, ierr )
940	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_INTEGER, &
941	type_x_int, ierr )
942	CALL MPI_TYPE_COMMIT( type_x_int, ierr )
943
944	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_REAL, type_y, ierr )
945	CALL MPI_TYPE_COMMIT( type_y, ierr )
946	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_INTEGER, type_y_int, ierr )
947	CALL MPI_TYPE_COMMIT( type_y_int, ierr )
948
949
950	!
951	!-- Calculate gridpoint numbers for the exchange of ghost points along x
952	!-- (yz-plane for 3D-arrays) and define MPI derived data type(s) for the
953	!-- exchange of ghost points in y-direction (xz-plane).
954	!-- Do these calculations for the model grid and (if necessary) also
955	!-- for the coarser grid levels used in the multigrid method
956	ALLOCATE ( ngp_yz(0:maximum_grid_level), type_xz(0:maximum_grid_level),&
957	type_yz(0:maximum_grid_level) )
958
959	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzb_l = nzb; nzt_l = nzt
960
961	!
962	!-- Discern between the model grid, which needs nbgp ghost points and
963	!-- grid levels for the multigrid scheme. In the latter case only one
964	!-- ghost point is necessary.
965	!-- First definition of MPI-datatypes for exchange of ghost layers on normal
966	!-- grid. The following loop is needed for data exchange in poismg.f90.
967	!
968	!-- Determine number of grid points of yz-layer for exchange
969	ngp_yz(0) = (nzt - nzb + 2) * (nyn - nys + 1 + 2 * nbgp)
970
971	!
972	!-- Define an MPI-datatype for the exchange of left/right boundaries.
973	!-- Although data are contiguous in physical memory (which does not
974	!-- necessarily require an MPI-derived datatype), the data exchange between
975	!-- left and right PE's using the MPI-derived type is 10% faster than without.
976	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2nbgp, nbgp(nzt-nzb+2), ngp_yz(0), &
977	MPI_REAL, type_xz(0), ierr )
978	CALL MPI_TYPE_COMMIT( type_xz(0), ierr )
979
980	CALL MPI_TYPE_VECTOR( nbgp, ngp_yz(0), ngp_yz(0), MPI_REAL, type_yz(0), &
981	ierr )
982	CALL MPI_TYPE_COMMIT( type_yz(0), ierr )
983
984	!
985	!-- Definition of MPI-datatypes for multigrid method (coarser level grids)
986	IF ( psolver == 'multigrid' ) THEN
987	!
988	!-- Definition of MPI-datatyoe as above, but only 1 ghost level is used
989	DO i = maximum_grid_level, 1 , -1
990
991	ngp_yz(i) = (nzt_l - nzb_l + 2) * (nyn_l - nys_l + 3)
992
993	CALL MPI_TYPE_VECTOR( nxr_l-nxl_l+3, nzt_l-nzb_l+2, ngp_yz(i), &
994	MPI_REAL, type_xz(i), ierr )
995	CALL MPI_TYPE_COMMIT( type_xz(i), ierr )
996
997	CALL MPI_TYPE_VECTOR( 1, ngp_yz(i), ngp_yz(i), MPI_REAL, type_yz(i), &
998	ierr )
999	CALL MPI_TYPE_COMMIT( type_yz(i), ierr )
1000
1001	nxl_l = nxl_l / 2
1002	nxr_l = nxr_l / 2
1003	nys_l = nys_l / 2
1004	nyn_l = nyn_l / 2
1005	nzt_l = nzt_l / 2
1006
1007	ENDDO
1008
1009	ENDIF
1010	#endif
1011
1012	#if defined( __parallel ) && ! defined ( __check )
1013	!
1014	!-- Setting of flags for inflow/outflow conditions in case of non-cyclic
1015	!-- horizontal boundary conditions.
1016	IF ( pleft == MPI_PROC_NULL ) THEN
1017	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1018	inflow_l = .TRUE.
1019	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1020	outflow_l = .TRUE.
1021	ENDIF
1022	ENDIF
1023
1024	IF ( pright == MPI_PROC_NULL ) THEN
1025	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1026	outflow_r = .TRUE.
1027	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1028	inflow_r = .TRUE.
1029	ENDIF
1030	ENDIF
1031
1032	IF ( psouth == MPI_PROC_NULL ) THEN
1033	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1034	outflow_s = .TRUE.
1035	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1036	inflow_s = .TRUE.
1037	ENDIF
1038	ENDIF
1039
1040	IF ( pnorth == MPI_PROC_NULL ) THEN
1041	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1042	inflow_n = .TRUE.
1043	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1044	outflow_n = .TRUE.
1045	ENDIF
1046	ENDIF
1047
1048	!
1049	!-- Broadcast the id of the inflow PE
1050	IF ( inflow_l ) THEN
1051	id_inflow_l = myidx
1052	ELSE
1053	id_inflow_l = 0
1054	ENDIF
1055	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1056	CALL MPI_ALLREDUCE( id_inflow_l, id_inflow, 1, MPI_INTEGER, MPI_SUM, &
1057	comm1dx, ierr )
1058
1059	!
1060	!-- Broadcast the id of the recycling plane
1061	!-- WARNING: needs to be adjusted in case of inflows other than from left side!
1062	IF ( NINT( recycling_width / dx ) >= nxl .AND. &
1063	NINT( recycling_width / dx ) <= nxr ) THEN
1064	id_recycling_l = myidx
1065	ELSE
1066	id_recycling_l = 0
1067	ENDIF
1068	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1069	CALL MPI_ALLREDUCE( id_recycling_l, id_recycling, 1, MPI_INTEGER, MPI_SUM, &
1070	comm1dx, ierr )
1071
1072	#elif ! defined ( __parallel )
1073	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1074	inflow_l = .TRUE.
1075	outflow_r = .TRUE.
1076	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1077	outflow_l = .TRUE.
1078	inflow_r = .TRUE.
1079	ENDIF
1080
1081	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1082	inflow_n = .TRUE.
1083	outflow_s = .TRUE.
1084	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1085	outflow_n = .TRUE.
1086	inflow_s = .TRUE.
1087	ENDIF
1088	#endif
1089
1090	!
1091	!-- At the inflow or outflow, u or v, respectively, have to be calculated for
1092	!-- one more grid point.
1093	IF ( inflow_l .OR. outflow_l ) THEN
1094	nxlu = nxl + 1
1095	ELSE
1096	nxlu = nxl
1097	ENDIF
1098	IF ( inflow_s .OR. outflow_s ) THEN
1099	nysv = nys + 1
1100	ELSE
1101	nysv = nys
1102	ENDIF
1103
1104	!
1105	!-- Allocate wall flag arrays used in the multigrid solver
1106	IF ( psolver == 'multigrid' ) THEN
1107
1108	DO i = maximum_grid_level, 1, -1
1109
1110	SELECT CASE ( i )
1111
1112	CASE ( 1 )
1113	ALLOCATE( wall_flags_1(nzb:nzt_mg(i)+1, &
1114	nys_mg(i)-1:nyn_mg(i)+1, &
1115	nxl_mg(i)-1:nxr_mg(i)+1) )
1116
1117	CASE ( 2 )
1118	ALLOCATE( wall_flags_2(nzb:nzt_mg(i)+1, &
1119	nys_mg(i)-1:nyn_mg(i)+1, &
1120	nxl_mg(i)-1:nxr_mg(i)+1) )
1121
1122	CASE ( 3 )
1123	ALLOCATE( wall_flags_3(nzb:nzt_mg(i)+1, &
1124	nys_mg(i)-1:nyn_mg(i)+1, &
1125	nxl_mg(i)-1:nxr_mg(i)+1) )
1126
1127	CASE ( 4 )
1128	ALLOCATE( wall_flags_4(nzb:nzt_mg(i)+1, &
1129	nys_mg(i)-1:nyn_mg(i)+1, &
1130	nxl_mg(i)-1:nxr_mg(i)+1) )
1131
1132	CASE ( 5 )
1133	ALLOCATE( wall_flags_5(nzb:nzt_mg(i)+1, &
1134	nys_mg(i)-1:nyn_mg(i)+1, &
1135	nxl_mg(i)-1:nxr_mg(i)+1) )
1136
1137	CASE ( 6 )
1138	ALLOCATE( wall_flags_6(nzb:nzt_mg(i)+1, &
1139	nys_mg(i)-1:nyn_mg(i)+1, &
1140	nxl_mg(i)-1:nxr_mg(i)+1) )
1141
1142	CASE ( 7 )
1143	ALLOCATE( wall_flags_7(nzb:nzt_mg(i)+1, &
1144	nys_mg(i)-1:nyn_mg(i)+1, &
1145	nxl_mg(i)-1:nxr_mg(i)+1) )
1146
1147	CASE ( 8 )
1148	ALLOCATE( wall_flags_8(nzb:nzt_mg(i)+1, &
1149	nys_mg(i)-1:nyn_mg(i)+1, &
1150	nxl_mg(i)-1:nxr_mg(i)+1) )
1151
1152	CASE ( 9 )
1153	ALLOCATE( wall_flags_9(nzb:nzt_mg(i)+1, &
1154	nys_mg(i)-1:nyn_mg(i)+1, &
1155	nxl_mg(i)-1:nxr_mg(i)+1) )
1156
1157	CASE ( 10 )
1158	ALLOCATE( wall_flags_10(nzb:nzt_mg(i)+1, &
1159	nys_mg(i)-1:nyn_mg(i)+1, &
1160	nxl_mg(i)-1:nxr_mg(i)+1) )
1161
1162	CASE DEFAULT
1163	message_string = 'more than 10 multigrid levels'
1164	CALL message( 'init_pegrid', 'PA0238', 1, 2, 0, 6, 0 )
1165
1166	END SELECT
1167
1168	ENDDO
1169
1170	ENDIF
1171
1172	!
1173	!-- Calculate the number of groups into which parallel I/O is split.
1174	!-- The default for files which are opened by all PEs (or where each
1175	!-- PE opens his own independent file) is, that all PEs are doing input/output
1176	!-- in parallel at the same time. This might cause performance or even more
1177	!-- severe problems depending on the configuration of the underlying file
1178	!-- system.
1179	!-- First, set the default:
1180	IF ( maximum_parallel_io_streams == -1 .OR. &
1181	maximum_parallel_io_streams > numprocs ) THEN
1182	maximum_parallel_io_streams = numprocs
1183	ENDIF
1184
1185	!
1186	!-- Now calculate the number of io_blocks and the io_group to which the
1187	!-- respective PE belongs. I/O of the groups is done in serial, but in parallel
1188	!-- for all PEs belonging to the same group. A preliminary setting with myid
1189	!-- based on MPI_COMM_WORLD has been done in parin.
1190	io_blocks = numprocs / maximum_parallel_io_streams
1191	io_group = MOD( myid+1, io_blocks )
1192
1193
1194	END SUBROUTINE init_pegrid

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