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source: palm/trunk/SOURCE/init_pegrid.f90 @ 1332

Last change on this file since 1332 was 1323, checked in by raasch, 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 1323 2014-03-20 17:09:54Z suehring $
27	!
28	! 1322 2014-03-20 16:38:49Z raasch
29	! REAL functions provided with KIND-attribute
30	!
31	! 1320 2014-03-20 08:40:49Z raasch
32	! ONLY-attribute added to USE-statements,
33	! kind-parameters added to all INTEGER and REAL declaration statements,
34	! kinds are defined in new module kinds,
35	! revision history before 2012 removed,
36	! comment fields (!:) to be used for variable explanations added to
37	! all variable declaration statements
38	!
39	! 1304 2014-03-12 10:29:42Z raasch
40	! bugfix: single core MPI runs missed some settings of transpose indices
41	!
42	! 1212 2013-08-15 08:46:27Z raasch
43	! error message for poisfft_hybrid removed
44	!
45	! 1159 2013-05-21 11:58:22Z fricke
46	! dirichlet/neumann and neumann/dirichlet removed
47	!
48	! 1139 2013-04-18 07:25:03Z raasch
49	! bugfix for calculating the id of the PE carrying the recycling plane
50	!
51	! 1111 2013-03-08 23:54:10Z raasch
52	! initialization of poisfft moved to module poisfft
53	!
54	! 1092 2013-02-02 11:24:22Z raasch
55	! unused variables removed
56	!
57	! 1056 2012-11-16 15:28:04Z raasch
58	! Indices for arrays n.._mg start from zero due to definition of arrays f2 and
59	! p2 as automatic arrays in recursive subroutine next_mg_level
60	!
61	! 1041 2012-11-06 02:36:29Z raasch
62	! a 2d virtual processor topology is used by default for all machines
63	!
64	! 1036 2012-10-22 13:43:42Z raasch
65	! code put under GPL (PALM 3.9)
66	!
67	! 1003 2012-09-14 14:35:53Z raasch
68	! subdomains must have identical size (grid matching = "match" removed)
69	!
70	! 1001 2012-09-13 14:08:46Z raasch
71	! all actions concerning upstream-spline-method removed
72	!
73	! 978 2012-08-09 08:28:32Z fricke
74	! dirichlet/neumann and neumann/dirichlet added
75	! nxlu and nysv are also calculated for inflow boundary
76	!
77	! 809 2012-01-30 13:32:58Z maronga
78	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
79	!
80	! 807 2012-01-25 11:53:51Z maronga
81	! New cpp directive "__check" implemented which is used by check_namelist_files
82	!
83	! Revision 1.1 1997/07/24 11:15:09 raasch
84	! Initial revision
85	!
86	!
87	! Description:
88	! ------------
89	! Determination of the virtual processor topology (if not prescribed by the
90	! user)and computation of the grid point number and array bounds of the local
91	! domains.
92	!------------------------------------------------------------------------------!
93
94	USE control_parameters, &
95	ONLY: bc_lr, bc_ns, coupling_mode, coupling_topology, dt_dosp, &
96	gathered_size, grid_level, grid_level_count, host, inflow_l, &
97	inflow_n, inflow_r, inflow_s, io_blocks, io_group, &
98	maximum_grid_level, maximum_parallel_io_streams, message_string,&
99	mg_switch_to_pe0_level, momentum_advec, psolver, outflow_l, &
100	outflow_n, outflow_r, outflow_s, recycling_width, scalar_advec, &
101	subdomain_size
102
103	USE grid_variables, &
104	ONLY: dx
105
106	USE indices, &
107	ONLY: mg_loc_ind, nbgp, nnx, nny, nnz, nx, nx_a, nx_o, nxl, nxl_mg, &
108	nxlu, nxr, nxr_mg, ny, ny_a, ny_o, nyn, nyn_mg, nys, nys_mg, &
109	nysv, nz, nzb, nzt, nzt_mg, wall_flags_1, wall_flags_2, &
110	wall_flags_3, wall_flags_4, wall_flags_5, wall_flags_6, &
111	wall_flags_7, wall_flags_8, wall_flags_9, wall_flags_10
112
113	USE kinds
114
115	USE pegrid
116
117	USE transpose_indices, &
118	ONLY: nxl_y, nxl_yd, nxl_z, nxr_y, nxr_yd, nxr_z, nyn_x, nyn_z, nys_x,&
119	nys_z, nzb_x, nzb_y, nzb_yd, nzt_x, nzt_yd, nzt_y
120
121	IMPLICIT NONE
122
123	INTEGER(iwp) :: i !:
124	INTEGER(iwp) :: id_inflow_l !:
125	INTEGER(iwp) :: id_recycling_l !:
126	INTEGER(iwp) :: ind(5) !:
127	INTEGER(iwp) :: j !:
128	INTEGER(iwp) :: k !:
129	INTEGER(iwp) :: maximum_grid_level_l !:
130	INTEGER(iwp) :: mg_levels_x !:
131	INTEGER(iwp) :: mg_levels_y !:
132	INTEGER(iwp) :: mg_levels_z !:
133	INTEGER(iwp) :: mg_switch_to_pe0_level_l !:
134	INTEGER(iwp) :: nnx_y !:
135	INTEGER(iwp) :: nnx_z !:
136	INTEGER(iwp) :: nny_x !:
137	INTEGER(iwp) :: nny_z !:
138	INTEGER(iwp) :: nnz_x !:
139	INTEGER(iwp) :: nnz_y !:
140	INTEGER(iwp) :: numproc_sqr !:
141	INTEGER(iwp) :: nxl_l !:
142	INTEGER(iwp) :: nxr_l !:
143	INTEGER(iwp) :: nyn_l !:
144	INTEGER(iwp) :: nys_l !:
145	INTEGER(iwp) :: nzb_l !:
146	INTEGER(iwp) :: nzt_l !:
147	INTEGER(iwp) :: omp_get_num_threads !:
148
149	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: ind_all !:
150	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxlf !:
151	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxrf !:
152	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nynf !:
153	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nysf !:
154
155	INTEGER(iwp), DIMENSION(2) :: pdims_remote !:
156
157	#if defined( __mpi2 )
158	LOGICAL :: found !:
159	#endif
160
161	!
162	!-- Get the number of OpenMP threads
163	!$OMP PARALLEL
164	#if defined( __intel_openmp_bug )
165	threads_per_task = omp_get_num_threads()
166	#else
167	!$ threads_per_task = omp_get_num_threads()
168	#endif
169	!$OMP END PARALLEL
170
171
172	#if defined( __parallel )
173
174	!
175	!-- Determine the processor topology or check it, if prescribed by the user
176	IF ( npex == -1 .AND. npey == -1 ) THEN
177
178	!
179	!-- Automatic determination of the topology
180	numproc_sqr = SQRT( REAL( numprocs, KIND=wp ) )
181	pdims(1) = MAX( numproc_sqr , 1 )
182	DO WHILE ( MOD( numprocs , pdims(1) ) /= 0 )
183	pdims(1) = pdims(1) - 1
184	ENDDO
185	pdims(2) = numprocs / pdims(1)
186
187	ELSEIF ( npex /= -1 .AND. npey /= -1 ) THEN
188
189	!
190	!-- Prescribed by user. Number of processors on the prescribed topology
191	!-- must be equal to the number of PEs available to the job
192	IF ( ( npex * npey ) /= numprocs ) THEN
193	WRITE( message_string, * ) 'number of PEs of the prescribed ', &
194	'topology (', npex*npey,') does not match & the number of ', &
195	'PEs available to the job (', numprocs, ')'
196	CALL message( 'init_pegrid', 'PA0221', 1, 2, 0, 6, 0 )
197	ENDIF
198	pdims(1) = npex
199	pdims(2) = npey
200
201	ELSE
202	!
203	!-- If the processor topology is prescribed by the user, the number of
204	!-- PEs must be given in both directions
205	message_string = 'if the processor topology is prescribed by the, ' // &
206	' user& both values of "npex" and "npey" must be given ' // &
207	'in the &NAMELIST-parameter file'
208	CALL message( 'init_pegrid', 'PA0222', 1, 2, 0, 6, 0 )
209
210	ENDIF
211
212	!
213	!-- For communication speedup, set barriers in front of collective
214	!-- communications by default on SGI-type systems
215	IF ( host(3:5) == 'sgi' ) collective_wait = .TRUE.
216
217	!
218	!-- If necessary, set horizontal boundary conditions to non-cyclic
219	IF ( bc_lr /= 'cyclic' ) cyclic(1) = .FALSE.
220	IF ( bc_ns /= 'cyclic' ) cyclic(2) = .FALSE.
221
222
223	#if ! defined( __check)
224	!
225	!-- Create the virtual processor grid
226	CALL MPI_CART_CREATE( comm_palm, ndim, pdims, cyclic, reorder, &
227	comm2d, ierr )
228	CALL MPI_COMM_RANK( comm2d, myid, ierr )
229	WRITE (myid_char,'(''_'',I4.4)') myid
230
231	CALL MPI_CART_COORDS( comm2d, myid, ndim, pcoord, ierr )
232	CALL MPI_CART_SHIFT( comm2d, 0, 1, pleft, pright, ierr )
233	CALL MPI_CART_SHIFT( comm2d, 1, 1, psouth, pnorth, ierr )
234
235	!
236	!-- Determine sub-topologies for transpositions
237	!-- Transposition from z to x:
238	remain_dims(1) = .TRUE.
239	remain_dims(2) = .FALSE.
240	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dx, ierr )
241	CALL MPI_COMM_RANK( comm1dx, myidx, ierr )
242	!
243	!-- Transposition from x to y
244	remain_dims(1) = .FALSE.
245	remain_dims(2) = .TRUE.
246	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dy, ierr )
247	CALL MPI_COMM_RANK( comm1dy, myidy, ierr )
248
249	#endif
250
251	!
252	!-- Calculate array bounds along x-direction for every PE.
253	ALLOCATE( nxlf(0:pdims(1)-1), nxrf(0:pdims(1)-1), nynf(0:pdims(2)-1), &
254	nysf(0:pdims(2)-1) )
255
256	IF ( MOD( nx+1 , pdims(1) ) /= 0 ) THEN
257	WRITE( message_string, * ) 'x-direction: gridpoint number (',nx+1,') ',&
258	'is not an& integral divisor of the number ', &
259	'processors (', pdims(1),')'
260	CALL message( 'init_pegrid', 'PA0225', 1, 2, 0, 6, 0 )
261	ELSE
262	nnx = ( nx + 1 ) / pdims(1)
263	IF ( nnx*pdims(1) - ( nx + 1) > nnx ) THEN
264	WRITE( message_string, * ) 'x-direction: nx does not match the', &
265	'requirements given by the number of PEs &used', &
266	'& please use nx = ', nx - ( pdims(1) - ( nnx*pdims(1) &
267	- ( nx + 1 ) ) ), ' instead of nx =', nx
268	CALL message( 'init_pegrid', 'PA0226', 1, 2, 0, 6, 0 )
269	ENDIF
270	ENDIF
271
272	!
273	!-- Left and right array bounds, number of gridpoints
274	DO i = 0, pdims(1)-1
275	nxlf(i) = i * nnx
276	nxrf(i) = ( i + 1 ) * nnx - 1
277	ENDDO
278
279	!
280	!-- Calculate array bounds in y-direction for every PE.
281	IF ( MOD( ny+1 , pdims(2) ) /= 0 ) THEN
282	WRITE( message_string, * ) 'y-direction: gridpoint number (',ny+1,') ', &
283	'is not an& integral divisor of the number of', &
284	'processors (', pdims(2),')'
285	CALL message( 'init_pegrid', 'PA0227', 1, 2, 0, 6, 0 )
286	ELSE
287	nny = ( ny + 1 ) / pdims(2)
288	IF ( nny*pdims(2) - ( ny + 1) > nny ) THEN
289	WRITE( message_string, * ) 'y-direction: ny does not match the', &
290	'requirements given by the number of PEs &used ', &
291	'& please use ny = ', ny - ( pdims(2) - ( nnx*pdims(2) &
292	- ( ny + 1 ) ) ), ' instead of ny =', ny
293	CALL message( 'init_pegrid', 'PA0228', 1, 2, 0, 6, 0 )
294	ENDIF
295	ENDIF
296
297	!
298	!-- South and north array bounds
299	DO j = 0, pdims(2)-1
300	nysf(j) = j * nny
301	nynf(j) = ( j + 1 ) * nny - 1
302	ENDDO
303
304	!
305	!-- Local array bounds of the respective PEs
306	nxl = nxlf(pcoord(1))
307	nxr = nxrf(pcoord(1))
308	nys = nysf(pcoord(2))
309	nyn = nynf(pcoord(2))
310	nzb = 0
311	nzt = nz
312	nnz = nz
313
314	!
315	!-- Set switches to define if the PE is situated at the border of the virtual
316	!-- processor grid
317	IF ( nxl == 0 ) left_border_pe = .TRUE.
318	IF ( nxr == nx ) right_border_pe = .TRUE.
319	IF ( nys == 0 ) south_border_pe = .TRUE.
320	IF ( nyn == ny ) north_border_pe = .TRUE.
321
322	!
323	!-- Calculate array bounds and gridpoint numbers for the transposed arrays
324	!-- (needed in the pressure solver)
325	!-- For the transposed arrays, cyclic boundaries as well as top and bottom
326	!-- boundaries are omitted, because they are obstructive to the transposition
327
328	!
329	!-- 1. transposition z --> x
330	!-- This transposition is not neccessary in case of a 1d-decomposition along x
331	nys_x = nys
332	nyn_x = nyn
333	nny_x = nny
334	nnz_x = nz / pdims(1)
335	nzb_x = 1 + myidx * nnz_x
336	nzt_x = ( myidx + 1 ) * nnz_x
337	sendrecvcount_zx = nnx * nny * nnz_x
338
339	IF ( pdims(2) /= 1 ) THEN
340	IF ( MOD( nz , pdims(1) ) /= 0 ) THEN
341	WRITE( message_string, * ) 'transposition z --> x:', &
342	'&nz=',nz,' is not an integral divisior of pdims(1)=', &
343	pdims(1)
344	CALL message( 'init_pegrid', 'PA0230', 1, 2, 0, 6, 0 )
345	ENDIF
346	ENDIF
347
348	!
349	!-- 2. transposition x --> y
350	nnz_y = nnz_x
351	nzb_y = nzb_x
352	nzt_y = nzt_x
353	IF ( MOD( nx+1 , pdims(2) ) /= 0 ) THEN
354	WRITE( message_string, * ) 'transposition x --> y:', &
355	'&nx+1=',nx+1,' is not an integral divisor of ',&
356	'pdims(2)=',pdims(2)
357	CALL message( 'init_pegrid', 'PA0231', 1, 2, 0, 6, 0 )
358	ENDIF
359	nnx_y = (nx+1) / pdims(2)
360	nxl_y = myidy * nnx_y
361	nxr_y = ( myidy + 1 ) * nnx_y - 1
362	sendrecvcount_xy = nnx_y * nny_x * nnz_y
363
364	!
365	!-- 3. transposition y --> z (ELSE: x --> y in case of 1D-decomposition
366	!-- along x)
367	nnx_z = nnx_y
368	nxl_z = nxl_y
369	nxr_z = nxr_y
370	nny_z = (ny+1) / pdims(1)
371	nys_z = myidx * nny_z
372	nyn_z = ( myidx + 1 ) * nny_z - 1
373	sendrecvcount_yz = nnx_y * nny_z * nnz_y
374
375	IF ( pdims(2) /= 1 ) THEN
376	!
377	!-- y --> z
378	!-- This transposition is not neccessary in case of a 1d-decomposition
379	!-- along x, except that the uptream-spline method is switched on
380	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
381	WRITE( message_string, * ) 'transposition y --> z:', &
382	'& ny+1=',ny+1,' is not an integral divisor of ',&
383	'pdims(1)=',pdims(1)
384	CALL message( 'init_pegrid', 'PA0232', 1, 2, 0, 6, 0 )
385	ENDIF
386
387	ELSE
388	!
389	!-- x --> y. This condition must be fulfilled for a 1D-decomposition along x
390	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
391	WRITE( message_string, * ) 'transposition x --> y:', &
392	'& ny+1=',ny+1,' is not an integral divisor of ',&
393	'pdims(1)=',pdims(1)
394	CALL message( 'init_pegrid', 'PA0233', 1, 2, 0, 6, 0 )
395	ENDIF
396
397	ENDIF
398
399	!
400	!-- Indices for direct transpositions z --> y (used for calculating spectra)
401	IF ( dt_dosp /= 9999999.9 ) THEN
402	IF ( MOD( nz, pdims(2) ) /= 0 ) THEN
403	WRITE( message_string, * ) 'direct transposition z --> y (needed ', &
404	'for spectra):& nz=',nz,' is not an integral divisor of ',&
405	'pdims(2)=',pdims(2)
406	CALL message( 'init_pegrid', 'PA0234', 1, 2, 0, 6, 0 )
407	ELSE
408	nxl_yd = nxl
409	nxr_yd = nxr
410	nzb_yd = 1 + myidy * ( nz / pdims(2) )
411	nzt_yd = ( myidy + 1 ) * ( nz / pdims(2) )
412	sendrecvcount_zyd = nnx * nny * ( nz / pdims(2) )
413	ENDIF
414	ENDIF
415
416	!
417	!-- Indices for direct transpositions y --> x (they are only possible in case
418	!-- of a 1d-decomposition along x)
419	IF ( pdims(2) == 1 ) THEN
420	nny_x = nny / pdims(1)
421	nys_x = myid * nny_x
422	nyn_x = ( myid + 1 ) * nny_x - 1
423	nzb_x = 1
424	nzt_x = nz
425	sendrecvcount_xy = nnx * nny_x * nz
426	ENDIF
427
428	!
429	!-- Indices for direct transpositions x --> y (they are only possible in case
430	!-- of a 1d-decomposition along y)
431	IF ( pdims(1) == 1 ) THEN
432	nnx_y = nnx / pdims(2)
433	nxl_y = myid * nnx_y
434	nxr_y = ( myid + 1 ) * nnx_y - 1
435	nzb_y = 1
436	nzt_y = nz
437	sendrecvcount_xy = nnx_y * nny * nz
438	ENDIF
439
440	!
441	!-- Arrays for storing the array bounds are needed any more
442	DEALLOCATE( nxlf , nxrf , nynf , nysf )
443
444
445	#if ! defined( __check)
446	!
447	!-- Collect index bounds from other PEs (to be written to restart file later)
448	ALLOCATE( hor_index_bounds(4,0:numprocs-1) )
449
450	IF ( myid == 0 ) THEN
451
452	hor_index_bounds(1,0) = nxl
453	hor_index_bounds(2,0) = nxr
454	hor_index_bounds(3,0) = nys
455	hor_index_bounds(4,0) = nyn
456
457	!
458	!-- Receive data from all other PEs
459	DO i = 1, numprocs-1
460	CALL MPI_RECV( ibuf, 4, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
461	ierr )
462	hor_index_bounds(:,i) = ibuf(1:4)
463	ENDDO
464
465	ELSE
466	!
467	!-- Send index bounds to PE0
468	ibuf(1) = nxl
469	ibuf(2) = nxr
470	ibuf(3) = nys
471	ibuf(4) = nyn
472	CALL MPI_SEND( ibuf, 4, MPI_INTEGER, 0, myid, comm2d, ierr )
473
474	ENDIF
475
476	#endif
477
478	#if defined( __print )
479	!
480	!-- Control output
481	IF ( myid == 0 ) THEN
482	PRINT, ' processor topology *'
483	PRINT*, ' '
484	PRINT*, 'myid pcoord left right south north idx idy nxl: nxr',&
485	&' nys: nyn'
486	PRINT*, '------------------------------------------------------------',&
487	&'-----------'
488	WRITE (*,1000) 0, pcoord(1), pcoord(2), pleft, pright, psouth, pnorth, &
489	myidx, myidy, nxl, nxr, nys, nyn
490	1000 FORMAT (I4,2X,'(',I3,',',I3,')',3X,I4,2X,I4,3X,I4,2X,I4,2X,I3,1X,I3, &
491	2(2X,I4,':',I4))
492
493	!
494	!-- Receive data from the other PEs
495	DO i = 1,numprocs-1
496	CALL MPI_RECV( ibuf, 12, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
497	ierr )
498	WRITE (*,1000) i, ( ibuf(j) , j = 1,12 )
499	ENDDO
500	ELSE
501
502	!
503	!-- Send data to PE0
504	ibuf(1) = pcoord(1); ibuf(2) = pcoord(2); ibuf(3) = pleft
505	ibuf(4) = pright; ibuf(5) = psouth; ibuf(6) = pnorth; ibuf(7) = myidx
506	ibuf(8) = myidy; ibuf(9) = nxl; ibuf(10) = nxr; ibuf(11) = nys
507	ibuf(12) = nyn
508	CALL MPI_SEND( ibuf, 12, MPI_INTEGER, 0, myid, comm2d, ierr )
509	ENDIF
510	#endif
511
512	#if defined( __parallel ) && ! defined( __check)
513	#if defined( __mpi2 )
514	!
515	!-- In case of coupled runs, get the port name on PE0 of the atmosphere model
516	!-- and pass it to PE0 of the ocean model
517	IF ( myid == 0 ) THEN
518
519	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
520
521	CALL MPI_OPEN_PORT( MPI_INFO_NULL, port_name, ierr )
522
523	CALL MPI_PUBLISH_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, &
524	ierr )
525
526	!
527	!-- Write a flag file for the ocean model and the other atmosphere
528	!-- processes.
529	!-- There seems to be a bug in MPICH2 which causes hanging processes
530	!-- in case that execution of LOOKUP_NAME is continued too early
531	!-- (i.e. before the port has been created)
532	OPEN( 90, FILE='COUPLING_PORT_OPENED', FORM='FORMATTED' )
533	WRITE ( 90, '(''TRUE'')' )
534	CLOSE ( 90 )
535
536	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
537
538	!
539	!-- Continue only if the atmosphere model has created the port.
540	!-- There seems to be a bug in MPICH2 which causes hanging processes
541	!-- in case that execution of LOOKUP_NAME is continued too early
542	!-- (i.e. before the port has been created)
543	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
544	DO WHILE ( .NOT. found )
545	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
546	ENDDO
547
548	CALL MPI_LOOKUP_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, ierr )
549
550	ENDIF
551
552	ENDIF
553
554	!
555	!-- In case of coupled runs, establish the connection between the atmosphere
556	!-- and the ocean model and define the intercommunicator (comm_inter)
557	CALL MPI_BARRIER( comm2d, ierr )
558	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
559
560	CALL MPI_COMM_ACCEPT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
561	comm_inter, ierr )
562	coupling_mode_remote = 'ocean_to_atmosphere'
563
564	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
565
566	CALL MPI_COMM_CONNECT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
567	comm_inter, ierr )
568	coupling_mode_remote = 'atmosphere_to_ocean'
569
570	ENDIF
571	#endif
572
573	!
574	!-- Determine the number of ghost point layers
575	IF ( scalar_advec == 'ws-scheme' .OR. momentum_advec == 'ws-scheme' ) THEN
576	nbgp = 3
577	ELSE
578	nbgp = 1
579	ENDIF
580
581	!
582	!-- Create a new MPI derived datatype for the exchange of surface (xy) data,
583	!-- which is needed for coupled atmosphere-ocean runs.
584	!-- First, calculate number of grid points of an xy-plane.
585	ngp_xy = ( nxr - nxl + 1 + 2 * nbgp ) * ( nyn - nys + 1 + 2 * nbgp )
586	CALL MPI_TYPE_VECTOR( ngp_xy, 1, nzt-nzb+2, MPI_REAL, type_xy, ierr )
587	CALL MPI_TYPE_COMMIT( type_xy, ierr )
588
589	IF ( TRIM( coupling_mode ) /= 'uncoupled' ) THEN
590
591	!
592	!-- Pass the number of grid points of the atmosphere model to
593	!-- the ocean model and vice versa
594	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
595
596	nx_a = nx
597	ny_a = ny
598
599	IF ( myid == 0 ) THEN
600
601	CALL MPI_SEND( nx_a, 1, MPI_INTEGER, numprocs, 1, comm_inter, &
602	ierr )
603	CALL MPI_SEND( ny_a, 1, MPI_INTEGER, numprocs, 2, comm_inter, &
604	ierr )
605	CALL MPI_SEND( pdims, 2, MPI_INTEGER, numprocs, 3, comm_inter, &
606	ierr )
607	CALL MPI_RECV( nx_o, 1, MPI_INTEGER, numprocs, 4, comm_inter, &
608	status, ierr )
609	CALL MPI_RECV( ny_o, 1, MPI_INTEGER, numprocs, 5, comm_inter, &
610	status, ierr )
611	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, numprocs, 6, &
612	comm_inter, status, ierr )
613	ENDIF
614
615	CALL MPI_BCAST( nx_o, 1, MPI_INTEGER, 0, comm2d, ierr )
616	CALL MPI_BCAST( ny_o, 1, MPI_INTEGER, 0, comm2d, ierr )
617	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr )
618
619	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
620
621	nx_o = nx
622	ny_o = ny
623
624	IF ( myid == 0 ) THEN
625
626	CALL MPI_RECV( nx_a, 1, MPI_INTEGER, 0, 1, comm_inter, status, &
627	ierr )
628	CALL MPI_RECV( ny_a, 1, MPI_INTEGER, 0, 2, comm_inter, status, &
629	ierr )
630	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, 0, 3, comm_inter, &
631	status, ierr )
632	CALL MPI_SEND( nx_o, 1, MPI_INTEGER, 0, 4, comm_inter, ierr )
633	CALL MPI_SEND( ny_o, 1, MPI_INTEGER, 0, 5, comm_inter, ierr )
634	CALL MPI_SEND( pdims, 2, MPI_INTEGER, 0, 6, comm_inter, ierr )
635	ENDIF
636
637	CALL MPI_BCAST( nx_a, 1, MPI_INTEGER, 0, comm2d, ierr)
638	CALL MPI_BCAST( ny_a, 1, MPI_INTEGER, 0, comm2d, ierr)
639	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr)
640
641	ENDIF
642
643	ngp_a = ( nx_a+1 + 2 * nbgp ) * ( ny_a+1 + 2 * nbgp )
644	ngp_o = ( nx_o+1 + 2 * nbgp ) * ( ny_o+1 + 2 * nbgp )
645
646	!
647	!-- Determine if the horizontal grid and the number of PEs in ocean and
648	!-- atmosphere is same or not
649	IF ( nx_o == nx_a .AND. ny_o == ny_a .AND. &
650	pdims(1) == pdims_remote(1) .AND. pdims(2) == pdims_remote(2) ) &
651	THEN
652	coupling_topology = 0
653	ELSE
654	coupling_topology = 1
655	ENDIF
656
657	!
658	!-- Determine the target PEs for the exchange between ocean and
659	!-- atmosphere (comm2d)
660	IF ( coupling_topology == 0 ) THEN
661	!
662	!-- In case of identical topologies, every atmosphere PE has exactly one
663	!-- ocean PE counterpart and vice versa
664	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
665	target_id = myid + numprocs
666	ELSE
667	target_id = myid
668	ENDIF
669
670	ELSE
671	!
672	!-- In case of nonequivalent topology in ocean and atmosphere only for
673	!-- PE0 in ocean and PE0 in atmosphere a target_id is needed, since
674	!-- data echxchange between ocean and atmosphere will be done only
675	!-- between these PEs.
676	IF ( myid == 0 ) THEN
677
678	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
679	target_id = numprocs
680	ELSE
681	target_id = 0
682	ENDIF
683
684	ENDIF
685
686	ENDIF
687
688	ENDIF
689
690
691	#endif
692
693	#else
694
695	!
696	!-- Array bounds when running on a single PE (respectively a non-parallel
697	!-- machine)
698	nxl = 0
699	nxr = nx
700	nnx = nxr - nxl + 1
701	nys = 0
702	nyn = ny
703	nny = nyn - nys + 1
704	nzb = 0
705	nzt = nz
706	nnz = nz
707
708	ALLOCATE( hor_index_bounds(4,0:0) )
709	hor_index_bounds(1,0) = nxl
710	hor_index_bounds(2,0) = nxr
711	hor_index_bounds(3,0) = nys
712	hor_index_bounds(4,0) = nyn
713
714	!
715	!-- Array bounds for the pressure solver (in the parallel code, these bounds
716	!-- are the ones for the transposed arrays)
717	nys_x = nys
718	nyn_x = nyn
719	nzb_x = nzb + 1
720	nzt_x = nzt
721
722	nxl_y = nxl
723	nxr_y = nxr
724	nzb_y = nzb + 1
725	nzt_y = nzt
726
727	nxl_z = nxl
728	nxr_z = nxr
729	nys_z = nys
730	nyn_z = nyn
731
732	#endif
733
734	!
735	!-- Calculate number of grid levels necessary for the multigrid poisson solver
736	!-- as well as the gridpoint indices on each level
737	IF ( psolver == 'multigrid' ) THEN
738
739	!
740	!-- First calculate number of possible grid levels for the subdomains
741	mg_levels_x = 1
742	mg_levels_y = 1
743	mg_levels_z = 1
744
745	i = nnx
746	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
747	i = i / 2
748	mg_levels_x = mg_levels_x + 1
749	ENDDO
750
751	j = nny
752	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
753	j = j / 2
754	mg_levels_y = mg_levels_y + 1
755	ENDDO
756
757	k = nz ! do not use nnz because it might be > nz due to transposition
758	! requirements
759	DO WHILE ( MOD( k, 2 ) == 0 .AND. k /= 2 )
760	k = k / 2
761	mg_levels_z = mg_levels_z + 1
762	ENDDO
763
764	maximum_grid_level = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
765
766	!
767	!-- Find out, if the total domain allows more levels. These additional
768	!-- levels are identically processed on all PEs.
769	IF ( numprocs > 1 .AND. mg_switch_to_pe0_level /= -1 ) THEN
770
771	IF ( mg_levels_z > MIN( mg_levels_x, mg_levels_y ) ) THEN
772
773	mg_switch_to_pe0_level_l = maximum_grid_level
774
775	mg_levels_x = 1
776	mg_levels_y = 1
777
778	i = nx+1
779	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
780	i = i / 2
781	mg_levels_x = mg_levels_x + 1
782	ENDDO
783
784	j = ny+1
785	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
786	j = j / 2
787	mg_levels_y = mg_levels_y + 1
788	ENDDO
789
790	maximum_grid_level_l = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
791
792	IF ( maximum_grid_level_l > mg_switch_to_pe0_level_l ) THEN
793	mg_switch_to_pe0_level_l = maximum_grid_level_l - &
794	mg_switch_to_pe0_level_l + 1
795	ELSE
796	mg_switch_to_pe0_level_l = 0
797	ENDIF
798
799	ELSE
800	mg_switch_to_pe0_level_l = 0
801	maximum_grid_level_l = maximum_grid_level
802
803	ENDIF
804
805	!
806	!-- Use switch level calculated above only if it is not pre-defined
807	!-- by user
808	IF ( mg_switch_to_pe0_level == 0 ) THEN
809	IF ( mg_switch_to_pe0_level_l /= 0 ) THEN
810	mg_switch_to_pe0_level = mg_switch_to_pe0_level_l
811	maximum_grid_level = maximum_grid_level_l
812	ENDIF
813
814	ELSE
815	!
816	!-- Check pre-defined value and reset to default, if neccessary
817	IF ( mg_switch_to_pe0_level < mg_switch_to_pe0_level_l .OR. &
818	mg_switch_to_pe0_level >= maximum_grid_level_l ) THEN
819	message_string = 'mg_switch_to_pe0_level ' // &
820	'out of range and reset to default (=0)'
821	CALL message( 'init_pegrid', 'PA0235', 0, 1, 0, 6, 0 )
822	mg_switch_to_pe0_level = 0
823	ELSE
824	!
825	!-- Use the largest number of possible levels anyway and recalculate
826	!-- the switch level to this largest number of possible values
827	maximum_grid_level = maximum_grid_level_l
828
829	ENDIF
830
831	ENDIF
832
833	ENDIF
834
835	ALLOCATE( grid_level_count(maximum_grid_level), &
836	nxl_mg(0:maximum_grid_level), nxr_mg(0:maximum_grid_level), &
837	nyn_mg(0:maximum_grid_level), nys_mg(0:maximum_grid_level), &
838	nzt_mg(0:maximum_grid_level) )
839
840	grid_level_count = 0
841	!
842	!-- Index zero required as dummy due to definition of arrays f2 and p2 in
843	!-- recursive subroutine next_mg_level
844	nxl_mg(0) = 0; nxr_mg(0) = 0; nyn_mg(0) = 0; nys_mg(0) = 0; nzt_mg(0) = 0
845
846	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzt_l = nzt
847
848	DO i = maximum_grid_level, 1 , -1
849
850	IF ( i == mg_switch_to_pe0_level ) THEN
851	#if defined( __parallel ) && ! defined( __check )
852	!
853	!-- Save the grid size of the subdomain at the switch level, because
854	!-- it is needed in poismg.
855	ind(1) = nxl_l; ind(2) = nxr_l
856	ind(3) = nys_l; ind(4) = nyn_l
857	ind(5) = nzt_l
858	ALLOCATE( ind_all(5*numprocs), mg_loc_ind(5,0:numprocs-1) )
859	CALL MPI_ALLGATHER( ind, 5, MPI_INTEGER, ind_all, 5, &
860	MPI_INTEGER, comm2d, ierr )
861	DO j = 0, numprocs-1
862	DO k = 1, 5
863	mg_loc_ind(k,j) = ind_all(k+j*5)
864	ENDDO
865	ENDDO
866	DEALLOCATE( ind_all )
867	!
868	!-- Calculate the grid size of the total domain
869	nxr_l = ( nxr_l-nxl_l+1 ) * pdims(1) - 1
870	nxl_l = 0
871	nyn_l = ( nyn_l-nys_l+1 ) * pdims(2) - 1
872	nys_l = 0
873	!
874	!-- The size of this gathered array must not be larger than the
875	!-- array tend, which is used in the multigrid scheme as a temporary
876	!-- array. Therefore the subdomain size of an PE is calculated and
877	!-- the size of the gathered grid. These values are used in
878	!-- routines pres and poismg
879	subdomain_size = ( nxr - nxl + 2 * nbgp + 1 ) * &
880	( nyn - nys + 2 * nbgp + 1 ) * ( nzt - nzb + 2 )
881	gathered_size = ( nxr_l - nxl_l + 3 ) * ( nyn_l - nys_l + 3 ) * &
882	( nzt_l - nzb + 2 )
883
884	#elif ! defined ( __parallel )
885	message_string = 'multigrid gather/scatter impossible ' // &
886	'in non parallel mode'
887	CALL message( 'init_pegrid', 'PA0237', 1, 2, 0, 6, 0 )
888	#endif
889	ENDIF
890
891	nxl_mg(i) = nxl_l
892	nxr_mg(i) = nxr_l
893	nys_mg(i) = nys_l
894	nyn_mg(i) = nyn_l
895	nzt_mg(i) = nzt_l
896
897	nxl_l = nxl_l / 2
898	nxr_l = nxr_l / 2
899	nys_l = nys_l / 2
900	nyn_l = nyn_l / 2
901	nzt_l = nzt_l / 2
902
903	ENDDO
904
905	!
906	!-- Temporary problem: Currently calculation of maxerror iin routine poismg crashes
907	!-- if grid data are collected on PE0 already on the finest grid level.
908	!-- To be solved later.
909	IF ( maximum_grid_level == mg_switch_to_pe0_level ) THEN
910	message_string = 'grid coarsening on subdomain level cannot be performed'
911	CALL message( 'poismg', 'PA0236', 1, 2, 0, 6, 0 )
912	ENDIF
913
914	ELSE
915
916	maximum_grid_level = 0
917
918	ENDIF
919
920	!
921	!-- Default level 0 tells exchange_horiz that all ghost planes have to be
922	!-- exchanged. grid_level is adjusted in poismg, where only one ghost plane
923	!-- is required.
924	grid_level = 0
925
926	#if defined( __parallel ) && ! defined ( __check )
927	!
928	!-- Gridpoint number for the exchange of ghost points (y-line for 2D-arrays)
929	ngp_y = nyn - nys + 1 + 2 * nbgp
930
931	!
932	!-- Define new MPI derived datatypes for the exchange of ghost points in
933	!-- x- and y-direction for 2D-arrays (line)
934	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_REAL, type_x, &
935	ierr )
936	CALL MPI_TYPE_COMMIT( type_x, ierr )
937	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_INTEGER, &
938	type_x_int, ierr )
939	CALL MPI_TYPE_COMMIT( type_x_int, ierr )
940
941	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_REAL, type_y, ierr )
942	CALL MPI_TYPE_COMMIT( type_y, ierr )
943	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_INTEGER, type_y_int, ierr )
944	CALL MPI_TYPE_COMMIT( type_y_int, ierr )
945
946
947	!
948	!-- Calculate gridpoint numbers for the exchange of ghost points along x
949	!-- (yz-plane for 3D-arrays) and define MPI derived data type(s) for the
950	!-- exchange of ghost points in y-direction (xz-plane).
951	!-- Do these calculations for the model grid and (if necessary) also
952	!-- for the coarser grid levels used in the multigrid method
953	ALLOCATE ( ngp_yz(0:maximum_grid_level), type_xz(0:maximum_grid_level),&
954	type_yz(0:maximum_grid_level) )
955
956	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzb_l = nzb; nzt_l = nzt
957
958	!
959	!-- Discern between the model grid, which needs nbgp ghost points and
960	!-- grid levels for the multigrid scheme. In the latter case only one
961	!-- ghost point is necessary.
962	!-- First definition of MPI-datatypes for exchange of ghost layers on normal
963	!-- grid. The following loop is needed for data exchange in poismg.f90.
964	!
965	!-- Determine number of grid points of yz-layer for exchange
966	ngp_yz(0) = (nzt - nzb + 2) * (nyn - nys + 1 + 2 * nbgp)
967
968	!
969	!-- Define an MPI-datatype for the exchange of left/right boundaries.
970	!-- Although data are contiguous in physical memory (which does not
971	!-- necessarily require an MPI-derived datatype), the data exchange between
972	!-- left and right PE's using the MPI-derived type is 10% faster than without.
973	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2nbgp, nbgp(nzt-nzb+2), ngp_yz(0), &
974	MPI_REAL, type_xz(0), ierr )
975	CALL MPI_TYPE_COMMIT( type_xz(0), ierr )
976
977	CALL MPI_TYPE_VECTOR( nbgp, ngp_yz(0), ngp_yz(0), MPI_REAL, type_yz(0), &
978	ierr )
979	CALL MPI_TYPE_COMMIT( type_yz(0), ierr )
980
981	!
982	!-- Definition of MPI-datatypes for multigrid method (coarser level grids)
983	IF ( psolver == 'multigrid' ) THEN
984	!
985	!-- Definition of MPI-datatyoe as above, but only 1 ghost level is used
986	DO i = maximum_grid_level, 1 , -1
987
988	ngp_yz(i) = (nzt_l - nzb_l + 2) * (nyn_l - nys_l + 3)
989
990	CALL MPI_TYPE_VECTOR( nxr_l-nxl_l+3, nzt_l-nzb_l+2, ngp_yz(i), &
991	MPI_REAL, type_xz(i), ierr )
992	CALL MPI_TYPE_COMMIT( type_xz(i), ierr )
993
994	CALL MPI_TYPE_VECTOR( 1, ngp_yz(i), ngp_yz(i), MPI_REAL, type_yz(i), &
995	ierr )
996	CALL MPI_TYPE_COMMIT( type_yz(i), ierr )
997
998	nxl_l = nxl_l / 2
999	nxr_l = nxr_l / 2
1000	nys_l = nys_l / 2
1001	nyn_l = nyn_l / 2
1002	nzt_l = nzt_l / 2
1003
1004	ENDDO
1005
1006	ENDIF
1007	#endif
1008
1009	#if defined( __parallel ) && ! defined ( __check )
1010	!
1011	!-- Setting of flags for inflow/outflow conditions in case of non-cyclic
1012	!-- horizontal boundary conditions.
1013	IF ( pleft == MPI_PROC_NULL ) THEN
1014	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1015	inflow_l = .TRUE.
1016	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1017	outflow_l = .TRUE.
1018	ENDIF
1019	ENDIF
1020
1021	IF ( pright == MPI_PROC_NULL ) THEN
1022	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1023	outflow_r = .TRUE.
1024	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1025	inflow_r = .TRUE.
1026	ENDIF
1027	ENDIF
1028
1029	IF ( psouth == MPI_PROC_NULL ) THEN
1030	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1031	outflow_s = .TRUE.
1032	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1033	inflow_s = .TRUE.
1034	ENDIF
1035	ENDIF
1036
1037	IF ( pnorth == MPI_PROC_NULL ) THEN
1038	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1039	inflow_n = .TRUE.
1040	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1041	outflow_n = .TRUE.
1042	ENDIF
1043	ENDIF
1044
1045	!
1046	!-- Broadcast the id of the inflow PE
1047	IF ( inflow_l ) THEN
1048	id_inflow_l = myidx
1049	ELSE
1050	id_inflow_l = 0
1051	ENDIF
1052	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1053	CALL MPI_ALLREDUCE( id_inflow_l, id_inflow, 1, MPI_INTEGER, MPI_SUM, &
1054	comm1dx, ierr )
1055
1056	!
1057	!-- Broadcast the id of the recycling plane
1058	!-- WARNING: needs to be adjusted in case of inflows other than from left side!
1059	IF ( NINT( recycling_width / dx ) >= nxl .AND. &
1060	NINT( recycling_width / dx ) <= nxr ) THEN
1061	id_recycling_l = myidx
1062	ELSE
1063	id_recycling_l = 0
1064	ENDIF
1065	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1066	CALL MPI_ALLREDUCE( id_recycling_l, id_recycling, 1, MPI_INTEGER, MPI_SUM, &
1067	comm1dx, ierr )
1068
1069	#elif ! defined ( __parallel )
1070	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1071	inflow_l = .TRUE.
1072	outflow_r = .TRUE.
1073	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1074	outflow_l = .TRUE.
1075	inflow_r = .TRUE.
1076	ENDIF
1077
1078	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1079	inflow_n = .TRUE.
1080	outflow_s = .TRUE.
1081	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1082	outflow_n = .TRUE.
1083	inflow_s = .TRUE.
1084	ENDIF
1085	#endif
1086
1087	!
1088	!-- At the inflow or outflow, u or v, respectively, have to be calculated for
1089	!-- one more grid point.
1090	IF ( inflow_l .OR. outflow_l ) THEN
1091	nxlu = nxl + 1
1092	ELSE
1093	nxlu = nxl
1094	ENDIF
1095	IF ( inflow_s .OR. outflow_s ) THEN
1096	nysv = nys + 1
1097	ELSE
1098	nysv = nys
1099	ENDIF
1100
1101	!
1102	!-- Allocate wall flag arrays used in the multigrid solver
1103	IF ( psolver == 'multigrid' ) THEN
1104
1105	DO i = maximum_grid_level, 1, -1
1106
1107	SELECT CASE ( i )
1108
1109	CASE ( 1 )
1110	ALLOCATE( wall_flags_1(nzb:nzt_mg(i)+1, &
1111	nys_mg(i)-1:nyn_mg(i)+1, &
1112	nxl_mg(i)-1:nxr_mg(i)+1) )
1113
1114	CASE ( 2 )
1115	ALLOCATE( wall_flags_2(nzb:nzt_mg(i)+1, &
1116	nys_mg(i)-1:nyn_mg(i)+1, &
1117	nxl_mg(i)-1:nxr_mg(i)+1) )
1118
1119	CASE ( 3 )
1120	ALLOCATE( wall_flags_3(nzb:nzt_mg(i)+1, &
1121	nys_mg(i)-1:nyn_mg(i)+1, &
1122	nxl_mg(i)-1:nxr_mg(i)+1) )
1123
1124	CASE ( 4 )
1125	ALLOCATE( wall_flags_4(nzb:nzt_mg(i)+1, &
1126	nys_mg(i)-1:nyn_mg(i)+1, &
1127	nxl_mg(i)-1:nxr_mg(i)+1) )
1128
1129	CASE ( 5 )
1130	ALLOCATE( wall_flags_5(nzb:nzt_mg(i)+1, &
1131	nys_mg(i)-1:nyn_mg(i)+1, &
1132	nxl_mg(i)-1:nxr_mg(i)+1) )
1133
1134	CASE ( 6 )
1135	ALLOCATE( wall_flags_6(nzb:nzt_mg(i)+1, &
1136	nys_mg(i)-1:nyn_mg(i)+1, &
1137	nxl_mg(i)-1:nxr_mg(i)+1) )
1138
1139	CASE ( 7 )
1140	ALLOCATE( wall_flags_7(nzb:nzt_mg(i)+1, &
1141	nys_mg(i)-1:nyn_mg(i)+1, &
1142	nxl_mg(i)-1:nxr_mg(i)+1) )
1143
1144	CASE ( 8 )
1145	ALLOCATE( wall_flags_8(nzb:nzt_mg(i)+1, &
1146	nys_mg(i)-1:nyn_mg(i)+1, &
1147	nxl_mg(i)-1:nxr_mg(i)+1) )
1148
1149	CASE ( 9 )
1150	ALLOCATE( wall_flags_9(nzb:nzt_mg(i)+1, &
1151	nys_mg(i)-1:nyn_mg(i)+1, &
1152	nxl_mg(i)-1:nxr_mg(i)+1) )
1153
1154	CASE ( 10 )
1155	ALLOCATE( wall_flags_10(nzb:nzt_mg(i)+1, &
1156	nys_mg(i)-1:nyn_mg(i)+1, &
1157	nxl_mg(i)-1:nxr_mg(i)+1) )
1158
1159	CASE DEFAULT
1160	message_string = 'more than 10 multigrid levels'
1161	CALL message( 'init_pegrid', 'PA0238', 1, 2, 0, 6, 0 )
1162
1163	END SELECT
1164
1165	ENDDO
1166
1167	ENDIF
1168
1169	!
1170	!-- Calculate the number of groups into which parallel I/O is split.
1171	!-- The default for files which are opened by all PEs (or where each
1172	!-- PE opens his own independent file) is, that all PEs are doing input/output
1173	!-- in parallel at the same time. This might cause performance or even more
1174	!-- severe problems depending on the configuration of the underlying file
1175	!-- system.
1176	!-- First, set the default:
1177	IF ( maximum_parallel_io_streams == -1 .OR. &
1178	maximum_parallel_io_streams > numprocs ) THEN
1179	maximum_parallel_io_streams = numprocs
1180	ENDIF
1181
1182	!
1183	!-- Now calculate the number of io_blocks and the io_group to which the
1184	!-- respective PE belongs. I/O of the groups is done in serial, but in parallel
1185	!-- for all PEs belonging to the same group. A preliminary setting with myid
1186	!-- based on MPI_COMM_WORLD has been done in parin.
1187	io_blocks = numprocs / maximum_parallel_io_streams
1188	io_group = MOD( myid+1, io_blocks )
1189
1190
1191	END SUBROUTINE init_pegrid

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