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source: palm/trunk/SOURCE/init_pegrid.f90 @ 1438

Last change on this file since 1438 was 1436, checked in by keck, 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 1436 2014-07-21 10:39:31Z heinze $
27	!
28	! 1435 2014-07-21 10:37:02Z keck
29	! bugfix: added missing parameter coupling_mode_remote to ONLY-attribute
30	!
31	! 1402 2014-05-09 14:25:13Z raasch
32	! location messages modified
33	!
34	! 1384 2014-05-02 14:31:06Z raasch
35	! location messages added
36	!
37	! 1353 2014-04-08 15:21:23Z heinze
38	! REAL constants provided with KIND-attribute
39	!
40	! 1322 2014-03-20 16:38:49Z raasch
41	! REAL functions provided with KIND-attribute
42	!
43	! 1320 2014-03-20 08:40:49Z raasch
44	! ONLY-attribute added to USE-statements,
45	! kind-parameters added to all INTEGER and REAL declaration statements,
46	! kinds are defined in new module kinds,
47	! revision history before 2012 removed,
48	! comment fields (!:) to be used for variable explanations added to
49	! all variable declaration statements
50	!
51	! 1304 2014-03-12 10:29:42Z raasch
52	! bugfix: single core MPI runs missed some settings of transpose indices
53	!
54	! 1212 2013-08-15 08:46:27Z raasch
55	! error message for poisfft_hybrid removed
56	!
57	! 1159 2013-05-21 11:58:22Z fricke
58	! dirichlet/neumann and neumann/dirichlet removed
59	!
60	! 1139 2013-04-18 07:25:03Z raasch
61	! bugfix for calculating the id of the PE carrying the recycling plane
62	!
63	! 1111 2013-03-08 23:54:10Z raasch
64	! initialization of poisfft moved to module poisfft
65	!
66	! 1092 2013-02-02 11:24:22Z raasch
67	! unused variables removed
68	!
69	! 1056 2012-11-16 15:28:04Z raasch
70	! Indices for arrays n.._mg start from zero due to definition of arrays f2 and
71	! p2 as automatic arrays in recursive subroutine next_mg_level
72	!
73	! 1041 2012-11-06 02:36:29Z raasch
74	! a 2d virtual processor topology is used by default for all machines
75	!
76	! 1036 2012-10-22 13:43:42Z raasch
77	! code put under GPL (PALM 3.9)
78	!
79	! 1003 2012-09-14 14:35:53Z raasch
80	! subdomains must have identical size (grid matching = "match" removed)
81	!
82	! 1001 2012-09-13 14:08:46Z raasch
83	! all actions concerning upstream-spline-method removed
84	!
85	! 978 2012-08-09 08:28:32Z fricke
86	! dirichlet/neumann and neumann/dirichlet added
87	! nxlu and nysv are also calculated for inflow boundary
88	!
89	! 809 2012-01-30 13:32:58Z maronga
90	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
91	!
92	! 807 2012-01-25 11:53:51Z maronga
93	! New cpp directive "__check" implemented which is used by check_namelist_files
94	!
95	! Revision 1.1 1997/07/24 11:15:09 raasch
96	! Initial revision
97	!
98	!
99	! Description:
100	! ------------
101	! Determination of the virtual processor topology (if not prescribed by the
102	! user)and computation of the grid point number and array bounds of the local
103	! domains.
104	!------------------------------------------------------------------------------!
105
106	USE control_parameters, &
107	ONLY: bc_lr, bc_ns, coupling_mode, coupling_mode_remote, &
108	coupling_topology, dt_dosp, gathered_size, grid_level, &
109	grid_level_count, host, inflow_l, inflow_n, inflow_r, inflow_s, &
110	io_blocks, io_group, maximum_grid_level, &
111	maximum_parallel_io_streams, message_string, &
112	mg_switch_to_pe0_level, momentum_advec, psolver, outflow_l, &
113	outflow_n, outflow_r, outflow_s, recycling_width, scalar_advec, &
114	subdomain_size
115
116	USE grid_variables, &
117	ONLY: dx
118
119	USE indices, &
120	ONLY: mg_loc_ind, nbgp, nnx, nny, nnz, nx, nx_a, nx_o, nxl, nxl_mg, &
121	nxlu, nxr, nxr_mg, ny, ny_a, ny_o, nyn, nyn_mg, nys, nys_mg, &
122	nysv, nz, nzb, nzt, nzt_mg, wall_flags_1, wall_flags_2, &
123	wall_flags_3, wall_flags_4, wall_flags_5, wall_flags_6, &
124	wall_flags_7, wall_flags_8, wall_flags_9, wall_flags_10
125
126	USE kinds
127
128	USE pegrid
129
130	USE transpose_indices, &
131	ONLY: nxl_y, nxl_yd, nxl_z, nxr_y, nxr_yd, nxr_z, nyn_x, nyn_z, nys_x,&
132	nys_z, nzb_x, nzb_y, nzb_yd, nzt_x, nzt_yd, nzt_y
133
134	IMPLICIT NONE
135
136	INTEGER(iwp) :: i !:
137	INTEGER(iwp) :: id_inflow_l !:
138	INTEGER(iwp) :: id_recycling_l !:
139	INTEGER(iwp) :: ind(5) !:
140	INTEGER(iwp) :: j !:
141	INTEGER(iwp) :: k !:
142	INTEGER(iwp) :: maximum_grid_level_l !:
143	INTEGER(iwp) :: mg_levels_x !:
144	INTEGER(iwp) :: mg_levels_y !:
145	INTEGER(iwp) :: mg_levels_z !:
146	INTEGER(iwp) :: mg_switch_to_pe0_level_l !:
147	INTEGER(iwp) :: nnx_y !:
148	INTEGER(iwp) :: nnx_z !:
149	INTEGER(iwp) :: nny_x !:
150	INTEGER(iwp) :: nny_z !:
151	INTEGER(iwp) :: nnz_x !:
152	INTEGER(iwp) :: nnz_y !:
153	INTEGER(iwp) :: numproc_sqr !:
154	INTEGER(iwp) :: nxl_l !:
155	INTEGER(iwp) :: nxr_l !:
156	INTEGER(iwp) :: nyn_l !:
157	INTEGER(iwp) :: nys_l !:
158	INTEGER(iwp) :: nzb_l !:
159	INTEGER(iwp) :: nzt_l !:
160	INTEGER(iwp) :: omp_get_num_threads !:
161
162	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: ind_all !:
163	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxlf !:
164	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxrf !:
165	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nynf !:
166	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nysf !:
167
168	INTEGER(iwp), DIMENSION(2) :: pdims_remote !:
169
170	#if defined( __mpi2 )
171	LOGICAL :: found !:
172	#endif
173
174	!
175	!-- Get the number of OpenMP threads
176	!$OMP PARALLEL
177	#if defined( __intel_openmp_bug )
178	threads_per_task = omp_get_num_threads()
179	#else
180	!$ threads_per_task = omp_get_num_threads()
181	#endif
182	!$OMP END PARALLEL
183
184
185	#if defined( __parallel )
186
187	CALL location_message( 'creating virtual PE grids + MPI derived data types', &
188	.FALSE. )
189	!
190	!-- Determine the processor topology or check it, if prescribed by the user
191	IF ( npex == -1 .AND. npey == -1 ) THEN
192
193	!
194	!-- Automatic determination of the topology
195	numproc_sqr = SQRT( REAL( numprocs, KIND=wp ) )
196	pdims(1) = MAX( numproc_sqr , 1 )
197	DO WHILE ( MOD( numprocs , pdims(1) ) /= 0 )
198	pdims(1) = pdims(1) - 1
199	ENDDO
200	pdims(2) = numprocs / pdims(1)
201
202	ELSEIF ( npex /= -1 .AND. npey /= -1 ) THEN
203
204	!
205	!-- Prescribed by user. Number of processors on the prescribed topology
206	!-- must be equal to the number of PEs available to the job
207	IF ( ( npex * npey ) /= numprocs ) THEN
208	WRITE( message_string, * ) 'number of PEs of the prescribed ', &
209	'topology (', npex*npey,') does not match & the number of ', &
210	'PEs available to the job (', numprocs, ')'
211	CALL message( 'init_pegrid', 'PA0221', 1, 2, 0, 6, 0 )
212	ENDIF
213	pdims(1) = npex
214	pdims(2) = npey
215
216	ELSE
217	!
218	!-- If the processor topology is prescribed by the user, the number of
219	!-- PEs must be given in both directions
220	message_string = 'if the processor topology is prescribed by the, ' // &
221	' user& both values of "npex" and "npey" must be given ' // &
222	'in the &NAMELIST-parameter file'
223	CALL message( 'init_pegrid', 'PA0222', 1, 2, 0, 6, 0 )
224
225	ENDIF
226
227	!
228	!-- For communication speedup, set barriers in front of collective
229	!-- communications by default on SGI-type systems
230	IF ( host(3:5) == 'sgi' ) collective_wait = .TRUE.
231
232	!
233	!-- If necessary, set horizontal boundary conditions to non-cyclic
234	IF ( bc_lr /= 'cyclic' ) cyclic(1) = .FALSE.
235	IF ( bc_ns /= 'cyclic' ) cyclic(2) = .FALSE.
236
237
238	#if ! defined( __check)
239	!
240	!-- Create the virtual processor grid
241	CALL MPI_CART_CREATE( comm_palm, ndim, pdims, cyclic, reorder, &
242	comm2d, ierr )
243	CALL MPI_COMM_RANK( comm2d, myid, ierr )
244	WRITE (myid_char,'(''_'',I4.4)') myid
245
246	CALL MPI_CART_COORDS( comm2d, myid, ndim, pcoord, ierr )
247	CALL MPI_CART_SHIFT( comm2d, 0, 1, pleft, pright, ierr )
248	CALL MPI_CART_SHIFT( comm2d, 1, 1, psouth, pnorth, ierr )
249
250	!
251	!-- Determine sub-topologies for transpositions
252	!-- Transposition from z to x:
253	remain_dims(1) = .TRUE.
254	remain_dims(2) = .FALSE.
255	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dx, ierr )
256	CALL MPI_COMM_RANK( comm1dx, myidx, ierr )
257	!
258	!-- Transposition from x to y
259	remain_dims(1) = .FALSE.
260	remain_dims(2) = .TRUE.
261	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dy, ierr )
262	CALL MPI_COMM_RANK( comm1dy, myidy, ierr )
263
264	#endif
265
266	!
267	!-- Calculate array bounds along x-direction for every PE.
268	ALLOCATE( nxlf(0:pdims(1)-1), nxrf(0:pdims(1)-1), nynf(0:pdims(2)-1), &
269	nysf(0:pdims(2)-1) )
270
271	IF ( MOD( nx+1 , pdims(1) ) /= 0 ) THEN
272	WRITE( message_string, * ) 'x-direction: gridpoint number (',nx+1,') ',&
273	'is not an& integral divisor of the number ', &
274	'processors (', pdims(1),')'
275	CALL message( 'init_pegrid', 'PA0225', 1, 2, 0, 6, 0 )
276	ELSE
277	nnx = ( nx + 1 ) / pdims(1)
278	IF ( nnx*pdims(1) - ( nx + 1) > nnx ) THEN
279	WRITE( message_string, * ) 'x-direction: nx does not match the', &
280	'requirements given by the number of PEs &used', &
281	'& please use nx = ', nx - ( pdims(1) - ( nnx*pdims(1) &
282	- ( nx + 1 ) ) ), ' instead of nx =', nx
283	CALL message( 'init_pegrid', 'PA0226', 1, 2, 0, 6, 0 )
284	ENDIF
285	ENDIF
286
287	!
288	!-- Left and right array bounds, number of gridpoints
289	DO i = 0, pdims(1)-1
290	nxlf(i) = i * nnx
291	nxrf(i) = ( i + 1 ) * nnx - 1
292	ENDDO
293
294	!
295	!-- Calculate array bounds in y-direction for every PE.
296	IF ( MOD( ny+1 , pdims(2) ) /= 0 ) THEN
297	WRITE( message_string, * ) 'y-direction: gridpoint number (',ny+1,') ', &
298	'is not an& integral divisor of the number of', &
299	'processors (', pdims(2),')'
300	CALL message( 'init_pegrid', 'PA0227', 1, 2, 0, 6, 0 )
301	ELSE
302	nny = ( ny + 1 ) / pdims(2)
303	IF ( nny*pdims(2) - ( ny + 1) > nny ) THEN
304	WRITE( message_string, * ) 'y-direction: ny does not match the', &
305	'requirements given by the number of PEs &used ', &
306	'& please use ny = ', ny - ( pdims(2) - ( nnx*pdims(2) &
307	- ( ny + 1 ) ) ), ' instead of ny =', ny
308	CALL message( 'init_pegrid', 'PA0228', 1, 2, 0, 6, 0 )
309	ENDIF
310	ENDIF
311
312	!
313	!-- South and north array bounds
314	DO j = 0, pdims(2)-1
315	nysf(j) = j * nny
316	nynf(j) = ( j + 1 ) * nny - 1
317	ENDDO
318
319	!
320	!-- Local array bounds of the respective PEs
321	nxl = nxlf(pcoord(1))
322	nxr = nxrf(pcoord(1))
323	nys = nysf(pcoord(2))
324	nyn = nynf(pcoord(2))
325	nzb = 0
326	nzt = nz
327	nnz = nz
328
329	!
330	!-- Set switches to define if the PE is situated at the border of the virtual
331	!-- processor grid
332	IF ( nxl == 0 ) left_border_pe = .TRUE.
333	IF ( nxr == nx ) right_border_pe = .TRUE.
334	IF ( nys == 0 ) south_border_pe = .TRUE.
335	IF ( nyn == ny ) north_border_pe = .TRUE.
336
337	!
338	!-- Calculate array bounds and gridpoint numbers for the transposed arrays
339	!-- (needed in the pressure solver)
340	!-- For the transposed arrays, cyclic boundaries as well as top and bottom
341	!-- boundaries are omitted, because they are obstructive to the transposition
342
343	!
344	!-- 1. transposition z --> x
345	!-- This transposition is not neccessary in case of a 1d-decomposition along x
346	nys_x = nys
347	nyn_x = nyn
348	nny_x = nny
349	nnz_x = nz / pdims(1)
350	nzb_x = 1 + myidx * nnz_x
351	nzt_x = ( myidx + 1 ) * nnz_x
352	sendrecvcount_zx = nnx * nny * nnz_x
353
354	IF ( pdims(2) /= 1 ) THEN
355	IF ( MOD( nz , pdims(1) ) /= 0 ) THEN
356	WRITE( message_string, * ) 'transposition z --> x:', &
357	'&nz=',nz,' is not an integral divisior of pdims(1)=', &
358	pdims(1)
359	CALL message( 'init_pegrid', 'PA0230', 1, 2, 0, 6, 0 )
360	ENDIF
361	ENDIF
362
363	!
364	!-- 2. transposition x --> y
365	nnz_y = nnz_x
366	nzb_y = nzb_x
367	nzt_y = nzt_x
368	IF ( MOD( nx+1 , pdims(2) ) /= 0 ) THEN
369	WRITE( message_string, * ) 'transposition x --> y:', &
370	'&nx+1=',nx+1,' is not an integral divisor of ',&
371	'pdims(2)=',pdims(2)
372	CALL message( 'init_pegrid', 'PA0231', 1, 2, 0, 6, 0 )
373	ENDIF
374	nnx_y = (nx+1) / pdims(2)
375	nxl_y = myidy * nnx_y
376	nxr_y = ( myidy + 1 ) * nnx_y - 1
377	sendrecvcount_xy = nnx_y * nny_x * nnz_y
378
379	!
380	!-- 3. transposition y --> z (ELSE: x --> y in case of 1D-decomposition
381	!-- along x)
382	nnx_z = nnx_y
383	nxl_z = nxl_y
384	nxr_z = nxr_y
385	nny_z = (ny+1) / pdims(1)
386	nys_z = myidx * nny_z
387	nyn_z = ( myidx + 1 ) * nny_z - 1
388	sendrecvcount_yz = nnx_y * nny_z * nnz_y
389
390	IF ( pdims(2) /= 1 ) THEN
391	!
392	!-- y --> z
393	!-- This transposition is not neccessary in case of a 1d-decomposition
394	!-- along x, except that the uptream-spline method is switched on
395	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
396	WRITE( message_string, * ) 'transposition y --> z:', &
397	'& ny+1=',ny+1,' is not an integral divisor of ',&
398	'pdims(1)=',pdims(1)
399	CALL message( 'init_pegrid', 'PA0232', 1, 2, 0, 6, 0 )
400	ENDIF
401
402	ELSE
403	!
404	!-- x --> y. This condition must be fulfilled for a 1D-decomposition along x
405	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
406	WRITE( message_string, * ) 'transposition x --> y:', &
407	'& ny+1=',ny+1,' is not an integral divisor of ',&
408	'pdims(1)=',pdims(1)
409	CALL message( 'init_pegrid', 'PA0233', 1, 2, 0, 6, 0 )
410	ENDIF
411
412	ENDIF
413
414	!
415	!-- Indices for direct transpositions z --> y (used for calculating spectra)
416	IF ( dt_dosp /= 9999999.9_wp ) THEN
417	IF ( MOD( nz, pdims(2) ) /= 0 ) THEN
418	WRITE( message_string, * ) 'direct transposition z --> y (needed ', &
419	'for spectra):& nz=',nz,' is not an integral divisor of ',&
420	'pdims(2)=',pdims(2)
421	CALL message( 'init_pegrid', 'PA0234', 1, 2, 0, 6, 0 )
422	ELSE
423	nxl_yd = nxl
424	nxr_yd = nxr
425	nzb_yd = 1 + myidy * ( nz / pdims(2) )
426	nzt_yd = ( myidy + 1 ) * ( nz / pdims(2) )
427	sendrecvcount_zyd = nnx * nny * ( nz / pdims(2) )
428	ENDIF
429	ENDIF
430
431	!
432	!-- Indices for direct transpositions y --> x (they are only possible in case
433	!-- of a 1d-decomposition along x)
434	IF ( pdims(2) == 1 ) THEN
435	nny_x = nny / pdims(1)
436	nys_x = myid * nny_x
437	nyn_x = ( myid + 1 ) * nny_x - 1
438	nzb_x = 1
439	nzt_x = nz
440	sendrecvcount_xy = nnx * nny_x * nz
441	ENDIF
442
443	!
444	!-- Indices for direct transpositions x --> y (they are only possible in case
445	!-- of a 1d-decomposition along y)
446	IF ( pdims(1) == 1 ) THEN
447	nnx_y = nnx / pdims(2)
448	nxl_y = myid * nnx_y
449	nxr_y = ( myid + 1 ) * nnx_y - 1
450	nzb_y = 1
451	nzt_y = nz
452	sendrecvcount_xy = nnx_y * nny * nz
453	ENDIF
454
455	!
456	!-- Arrays for storing the array bounds are needed any more
457	DEALLOCATE( nxlf , nxrf , nynf , nysf )
458
459
460	#if ! defined( __check)
461	!
462	!-- Collect index bounds from other PEs (to be written to restart file later)
463	ALLOCATE( hor_index_bounds(4,0:numprocs-1) )
464
465	IF ( myid == 0 ) THEN
466
467	hor_index_bounds(1,0) = nxl
468	hor_index_bounds(2,0) = nxr
469	hor_index_bounds(3,0) = nys
470	hor_index_bounds(4,0) = nyn
471
472	!
473	!-- Receive data from all other PEs
474	DO i = 1, numprocs-1
475	CALL MPI_RECV( ibuf, 4, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
476	ierr )
477	hor_index_bounds(:,i) = ibuf(1:4)
478	ENDDO
479
480	ELSE
481	!
482	!-- Send index bounds to PE0
483	ibuf(1) = nxl
484	ibuf(2) = nxr
485	ibuf(3) = nys
486	ibuf(4) = nyn
487	CALL MPI_SEND( ibuf, 4, MPI_INTEGER, 0, myid, comm2d, ierr )
488
489	ENDIF
490
491	#endif
492
493	#if defined( __print )
494	!
495	!-- Control output
496	IF ( myid == 0 ) THEN
497	PRINT, ' processor topology *'
498	PRINT*, ' '
499	PRINT*, 'myid pcoord left right south north idx idy nxl: nxr',&
500	&' nys: nyn'
501	PRINT*, '------------------------------------------------------------',&
502	&'-----------'
503	WRITE (*,1000) 0, pcoord(1), pcoord(2), pleft, pright, psouth, pnorth, &
504	myidx, myidy, nxl, nxr, nys, nyn
505	1000 FORMAT (I4,2X,'(',I3,',',I3,')',3X,I4,2X,I4,3X,I4,2X,I4,2X,I3,1X,I3, &
506	2(2X,I4,':',I4))
507
508	!
509	!-- Receive data from the other PEs
510	DO i = 1,numprocs-1
511	CALL MPI_RECV( ibuf, 12, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
512	ierr )
513	WRITE (*,1000) i, ( ibuf(j) , j = 1,12 )
514	ENDDO
515	ELSE
516
517	!
518	!-- Send data to PE0
519	ibuf(1) = pcoord(1); ibuf(2) = pcoord(2); ibuf(3) = pleft
520	ibuf(4) = pright; ibuf(5) = psouth; ibuf(6) = pnorth; ibuf(7) = myidx
521	ibuf(8) = myidy; ibuf(9) = nxl; ibuf(10) = nxr; ibuf(11) = nys
522	ibuf(12) = nyn
523	CALL MPI_SEND( ibuf, 12, MPI_INTEGER, 0, myid, comm2d, ierr )
524	ENDIF
525	#endif
526
527	#if defined( __parallel ) && ! defined( __check)
528	#if defined( __mpi2 )
529	!
530	!-- In case of coupled runs, get the port name on PE0 of the atmosphere model
531	!-- and pass it to PE0 of the ocean model
532	IF ( myid == 0 ) THEN
533
534	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
535
536	CALL MPI_OPEN_PORT( MPI_INFO_NULL, port_name, ierr )
537
538	CALL MPI_PUBLISH_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, &
539	ierr )
540
541	!
542	!-- Write a flag file for the ocean model and the other atmosphere
543	!-- processes.
544	!-- There seems to be a bug in MPICH2 which causes hanging processes
545	!-- in case that execution of LOOKUP_NAME is continued too early
546	!-- (i.e. before the port has been created)
547	OPEN( 90, FILE='COUPLING_PORT_OPENED', FORM='FORMATTED' )
548	WRITE ( 90, '(''TRUE'')' )
549	CLOSE ( 90 )
550
551	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
552
553	!
554	!-- Continue only if the atmosphere model has created the port.
555	!-- There seems to be a bug in MPICH2 which causes hanging processes
556	!-- in case that execution of LOOKUP_NAME is continued too early
557	!-- (i.e. before the port has been created)
558	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
559	DO WHILE ( .NOT. found )
560	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
561	ENDDO
562
563	CALL MPI_LOOKUP_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, ierr )
564
565	ENDIF
566
567	ENDIF
568
569	!
570	!-- In case of coupled runs, establish the connection between the atmosphere
571	!-- and the ocean model and define the intercommunicator (comm_inter)
572	CALL MPI_BARRIER( comm2d, ierr )
573	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
574
575	CALL MPI_COMM_ACCEPT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
576	comm_inter, ierr )
577	coupling_mode_remote = 'ocean_to_atmosphere'
578
579	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
580
581	CALL MPI_COMM_CONNECT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
582	comm_inter, ierr )
583	coupling_mode_remote = 'atmosphere_to_ocean'
584
585	ENDIF
586	#endif
587
588	!
589	!-- Determine the number of ghost point layers
590	IF ( scalar_advec == 'ws-scheme' .OR. momentum_advec == 'ws-scheme' ) THEN
591	nbgp = 3
592	ELSE
593	nbgp = 1
594	ENDIF
595
596	!
597	!-- Create a new MPI derived datatype for the exchange of surface (xy) data,
598	!-- which is needed for coupled atmosphere-ocean runs.
599	!-- First, calculate number of grid points of an xy-plane.
600	ngp_xy = ( nxr - nxl + 1 + 2 * nbgp ) * ( nyn - nys + 1 + 2 * nbgp )
601	CALL MPI_TYPE_VECTOR( ngp_xy, 1, nzt-nzb+2, MPI_REAL, type_xy, ierr )
602	CALL MPI_TYPE_COMMIT( type_xy, ierr )
603
604	IF ( TRIM( coupling_mode ) /= 'uncoupled' ) THEN
605
606	!
607	!-- Pass the number of grid points of the atmosphere model to
608	!-- the ocean model and vice versa
609	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
610
611	nx_a = nx
612	ny_a = ny
613
614	IF ( myid == 0 ) THEN
615
616	CALL MPI_SEND( nx_a, 1, MPI_INTEGER, numprocs, 1, comm_inter, &
617	ierr )
618	CALL MPI_SEND( ny_a, 1, MPI_INTEGER, numprocs, 2, comm_inter, &
619	ierr )
620	CALL MPI_SEND( pdims, 2, MPI_INTEGER, numprocs, 3, comm_inter, &
621	ierr )
622	CALL MPI_RECV( nx_o, 1, MPI_INTEGER, numprocs, 4, comm_inter, &
623	status, ierr )
624	CALL MPI_RECV( ny_o, 1, MPI_INTEGER, numprocs, 5, comm_inter, &
625	status, ierr )
626	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, numprocs, 6, &
627	comm_inter, status, ierr )
628	ENDIF
629
630	CALL MPI_BCAST( nx_o, 1, MPI_INTEGER, 0, comm2d, ierr )
631	CALL MPI_BCAST( ny_o, 1, MPI_INTEGER, 0, comm2d, ierr )
632	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr )
633
634	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
635
636	nx_o = nx
637	ny_o = ny
638
639	IF ( myid == 0 ) THEN
640
641	CALL MPI_RECV( nx_a, 1, MPI_INTEGER, 0, 1, comm_inter, status, &
642	ierr )
643	CALL MPI_RECV( ny_a, 1, MPI_INTEGER, 0, 2, comm_inter, status, &
644	ierr )
645	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, 0, 3, comm_inter, &
646	status, ierr )
647	CALL MPI_SEND( nx_o, 1, MPI_INTEGER, 0, 4, comm_inter, ierr )
648	CALL MPI_SEND( ny_o, 1, MPI_INTEGER, 0, 5, comm_inter, ierr )
649	CALL MPI_SEND( pdims, 2, MPI_INTEGER, 0, 6, comm_inter, ierr )
650	ENDIF
651
652	CALL MPI_BCAST( nx_a, 1, MPI_INTEGER, 0, comm2d, ierr)
653	CALL MPI_BCAST( ny_a, 1, MPI_INTEGER, 0, comm2d, ierr)
654	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr)
655
656	ENDIF
657
658	ngp_a = ( nx_a+1 + 2 * nbgp ) * ( ny_a+1 + 2 * nbgp )
659	ngp_o = ( nx_o+1 + 2 * nbgp ) * ( ny_o+1 + 2 * nbgp )
660
661	!
662	!-- Determine if the horizontal grid and the number of PEs in ocean and
663	!-- atmosphere is same or not
664	IF ( nx_o == nx_a .AND. ny_o == ny_a .AND. &
665	pdims(1) == pdims_remote(1) .AND. pdims(2) == pdims_remote(2) ) &
666	THEN
667	coupling_topology = 0
668	ELSE
669	coupling_topology = 1
670	ENDIF
671
672	!
673	!-- Determine the target PEs for the exchange between ocean and
674	!-- atmosphere (comm2d)
675	IF ( coupling_topology == 0 ) THEN
676	!
677	!-- In case of identical topologies, every atmosphere PE has exactly one
678	!-- ocean PE counterpart and vice versa
679	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
680	target_id = myid + numprocs
681	ELSE
682	target_id = myid
683	ENDIF
684
685	ELSE
686	!
687	!-- In case of nonequivalent topology in ocean and atmosphere only for
688	!-- PE0 in ocean and PE0 in atmosphere a target_id is needed, since
689	!-- data echxchange between ocean and atmosphere will be done only
690	!-- between these PEs.
691	IF ( myid == 0 ) THEN
692
693	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
694	target_id = numprocs
695	ELSE
696	target_id = 0
697	ENDIF
698
699	ENDIF
700
701	ENDIF
702
703	ENDIF
704
705
706	#endif
707
708	#else
709
710	!
711	!-- Array bounds when running on a single PE (respectively a non-parallel
712	!-- machine)
713	nxl = 0
714	nxr = nx
715	nnx = nxr - nxl + 1
716	nys = 0
717	nyn = ny
718	nny = nyn - nys + 1
719	nzb = 0
720	nzt = nz
721	nnz = nz
722
723	ALLOCATE( hor_index_bounds(4,0:0) )
724	hor_index_bounds(1,0) = nxl
725	hor_index_bounds(2,0) = nxr
726	hor_index_bounds(3,0) = nys
727	hor_index_bounds(4,0) = nyn
728
729	!
730	!-- Array bounds for the pressure solver (in the parallel code, these bounds
731	!-- are the ones for the transposed arrays)
732	nys_x = nys
733	nyn_x = nyn
734	nzb_x = nzb + 1
735	nzt_x = nzt
736
737	nxl_y = nxl
738	nxr_y = nxr
739	nzb_y = nzb + 1
740	nzt_y = nzt
741
742	nxl_z = nxl
743	nxr_z = nxr
744	nys_z = nys
745	nyn_z = nyn
746
747	#endif
748
749	!
750	!-- Calculate number of grid levels necessary for the multigrid poisson solver
751	!-- as well as the gridpoint indices on each level
752	IF ( psolver == 'multigrid' ) THEN
753
754	!
755	!-- First calculate number of possible grid levels for the subdomains
756	mg_levels_x = 1
757	mg_levels_y = 1
758	mg_levels_z = 1
759
760	i = nnx
761	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
762	i = i / 2
763	mg_levels_x = mg_levels_x + 1
764	ENDDO
765
766	j = nny
767	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
768	j = j / 2
769	mg_levels_y = mg_levels_y + 1
770	ENDDO
771
772	k = nz ! do not use nnz because it might be > nz due to transposition
773	! requirements
774	DO WHILE ( MOD( k, 2 ) == 0 .AND. k /= 2 )
775	k = k / 2
776	mg_levels_z = mg_levels_z + 1
777	ENDDO
778
779	maximum_grid_level = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
780
781	!
782	!-- Find out, if the total domain allows more levels. These additional
783	!-- levels are identically processed on all PEs.
784	IF ( numprocs > 1 .AND. mg_switch_to_pe0_level /= -1 ) THEN
785
786	IF ( mg_levels_z > MIN( mg_levels_x, mg_levels_y ) ) THEN
787
788	mg_switch_to_pe0_level_l = maximum_grid_level
789
790	mg_levels_x = 1
791	mg_levels_y = 1
792
793	i = nx+1
794	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
795	i = i / 2
796	mg_levels_x = mg_levels_x + 1
797	ENDDO
798
799	j = ny+1
800	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
801	j = j / 2
802	mg_levels_y = mg_levels_y + 1
803	ENDDO
804
805	maximum_grid_level_l = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
806
807	IF ( maximum_grid_level_l > mg_switch_to_pe0_level_l ) THEN
808	mg_switch_to_pe0_level_l = maximum_grid_level_l - &
809	mg_switch_to_pe0_level_l + 1
810	ELSE
811	mg_switch_to_pe0_level_l = 0
812	ENDIF
813
814	ELSE
815	mg_switch_to_pe0_level_l = 0
816	maximum_grid_level_l = maximum_grid_level
817
818	ENDIF
819
820	!
821	!-- Use switch level calculated above only if it is not pre-defined
822	!-- by user
823	IF ( mg_switch_to_pe0_level == 0 ) THEN
824	IF ( mg_switch_to_pe0_level_l /= 0 ) THEN
825	mg_switch_to_pe0_level = mg_switch_to_pe0_level_l
826	maximum_grid_level = maximum_grid_level_l
827	ENDIF
828
829	ELSE
830	!
831	!-- Check pre-defined value and reset to default, if neccessary
832	IF ( mg_switch_to_pe0_level < mg_switch_to_pe0_level_l .OR. &
833	mg_switch_to_pe0_level >= maximum_grid_level_l ) THEN
834	message_string = 'mg_switch_to_pe0_level ' // &
835	'out of range and reset to default (=0)'
836	CALL message( 'init_pegrid', 'PA0235', 0, 1, 0, 6, 0 )
837	mg_switch_to_pe0_level = 0
838	ELSE
839	!
840	!-- Use the largest number of possible levels anyway and recalculate
841	!-- the switch level to this largest number of possible values
842	maximum_grid_level = maximum_grid_level_l
843
844	ENDIF
845
846	ENDIF
847
848	ENDIF
849
850	ALLOCATE( grid_level_count(maximum_grid_level), &
851	nxl_mg(0:maximum_grid_level), nxr_mg(0:maximum_grid_level), &
852	nyn_mg(0:maximum_grid_level), nys_mg(0:maximum_grid_level), &
853	nzt_mg(0:maximum_grid_level) )
854
855	grid_level_count = 0
856	!
857	!-- Index zero required as dummy due to definition of arrays f2 and p2 in
858	!-- recursive subroutine next_mg_level
859	nxl_mg(0) = 0; nxr_mg(0) = 0; nyn_mg(0) = 0; nys_mg(0) = 0; nzt_mg(0) = 0
860
861	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzt_l = nzt
862
863	DO i = maximum_grid_level, 1 , -1
864
865	IF ( i == mg_switch_to_pe0_level ) THEN
866	#if defined( __parallel ) && ! defined( __check )
867	!
868	!-- Save the grid size of the subdomain at the switch level, because
869	!-- it is needed in poismg.
870	ind(1) = nxl_l; ind(2) = nxr_l
871	ind(3) = nys_l; ind(4) = nyn_l
872	ind(5) = nzt_l
873	ALLOCATE( ind_all(5*numprocs), mg_loc_ind(5,0:numprocs-1) )
874	CALL MPI_ALLGATHER( ind, 5, MPI_INTEGER, ind_all, 5, &
875	MPI_INTEGER, comm2d, ierr )
876	DO j = 0, numprocs-1
877	DO k = 1, 5
878	mg_loc_ind(k,j) = ind_all(k+j*5)
879	ENDDO
880	ENDDO
881	DEALLOCATE( ind_all )
882	!
883	!-- Calculate the grid size of the total domain
884	nxr_l = ( nxr_l-nxl_l+1 ) * pdims(1) - 1
885	nxl_l = 0
886	nyn_l = ( nyn_l-nys_l+1 ) * pdims(2) - 1
887	nys_l = 0
888	!
889	!-- The size of this gathered array must not be larger than the
890	!-- array tend, which is used in the multigrid scheme as a temporary
891	!-- array. Therefore the subdomain size of an PE is calculated and
892	!-- the size of the gathered grid. These values are used in
893	!-- routines pres and poismg
894	subdomain_size = ( nxr - nxl + 2 * nbgp + 1 ) * &
895	( nyn - nys + 2 * nbgp + 1 ) * ( nzt - nzb + 2 )
896	gathered_size = ( nxr_l - nxl_l + 3 ) * ( nyn_l - nys_l + 3 ) * &
897	( nzt_l - nzb + 2 )
898
899	#elif ! defined ( __parallel )
900	message_string = 'multigrid gather/scatter impossible ' // &
901	'in non parallel mode'
902	CALL message( 'init_pegrid', 'PA0237', 1, 2, 0, 6, 0 )
903	#endif
904	ENDIF
905
906	nxl_mg(i) = nxl_l
907	nxr_mg(i) = nxr_l
908	nys_mg(i) = nys_l
909	nyn_mg(i) = nyn_l
910	nzt_mg(i) = nzt_l
911
912	nxl_l = nxl_l / 2
913	nxr_l = nxr_l / 2
914	nys_l = nys_l / 2
915	nyn_l = nyn_l / 2
916	nzt_l = nzt_l / 2
917
918	ENDDO
919
920	!
921	!-- Temporary problem: Currently calculation of maxerror iin routine poismg crashes
922	!-- if grid data are collected on PE0 already on the finest grid level.
923	!-- To be solved later.
924	IF ( maximum_grid_level == mg_switch_to_pe0_level ) THEN
925	message_string = 'grid coarsening on subdomain level cannot be performed'
926	CALL message( 'poismg', 'PA0236', 1, 2, 0, 6, 0 )
927	ENDIF
928
929	ELSE
930
931	maximum_grid_level = 0
932
933	ENDIF
934
935	!
936	!-- Default level 0 tells exchange_horiz that all ghost planes have to be
937	!-- exchanged. grid_level is adjusted in poismg, where only one ghost plane
938	!-- is required.
939	grid_level = 0
940
941	#if defined( __parallel ) && ! defined ( __check )
942	!
943	!-- Gridpoint number for the exchange of ghost points (y-line for 2D-arrays)
944	ngp_y = nyn - nys + 1 + 2 * nbgp
945
946	!
947	!-- Define new MPI derived datatypes for the exchange of ghost points in
948	!-- x- and y-direction for 2D-arrays (line)
949	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_REAL, type_x, &
950	ierr )
951	CALL MPI_TYPE_COMMIT( type_x, ierr )
952	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_INTEGER, &
953	type_x_int, ierr )
954	CALL MPI_TYPE_COMMIT( type_x_int, ierr )
955
956	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_REAL, type_y, ierr )
957	CALL MPI_TYPE_COMMIT( type_y, ierr )
958	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_INTEGER, type_y_int, ierr )
959	CALL MPI_TYPE_COMMIT( type_y_int, ierr )
960
961
962	!
963	!-- Calculate gridpoint numbers for the exchange of ghost points along x
964	!-- (yz-plane for 3D-arrays) and define MPI derived data type(s) for the
965	!-- exchange of ghost points in y-direction (xz-plane).
966	!-- Do these calculations for the model grid and (if necessary) also
967	!-- for the coarser grid levels used in the multigrid method
968	ALLOCATE ( ngp_yz(0:maximum_grid_level), type_xz(0:maximum_grid_level),&
969	type_yz(0:maximum_grid_level) )
970
971	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzb_l = nzb; nzt_l = nzt
972
973	!
974	!-- Discern between the model grid, which needs nbgp ghost points and
975	!-- grid levels for the multigrid scheme. In the latter case only one
976	!-- ghost point is necessary.
977	!-- First definition of MPI-datatypes for exchange of ghost layers on normal
978	!-- grid. The following loop is needed for data exchange in poismg.f90.
979	!
980	!-- Determine number of grid points of yz-layer for exchange
981	ngp_yz(0) = (nzt - nzb + 2) * (nyn - nys + 1 + 2 * nbgp)
982
983	!
984	!-- Define an MPI-datatype for the exchange of left/right boundaries.
985	!-- Although data are contiguous in physical memory (which does not
986	!-- necessarily require an MPI-derived datatype), the data exchange between
987	!-- left and right PE's using the MPI-derived type is 10% faster than without.
988	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2nbgp, nbgp(nzt-nzb+2), ngp_yz(0), &
989	MPI_REAL, type_xz(0), ierr )
990	CALL MPI_TYPE_COMMIT( type_xz(0), ierr )
991
992	CALL MPI_TYPE_VECTOR( nbgp, ngp_yz(0), ngp_yz(0), MPI_REAL, type_yz(0), &
993	ierr )
994	CALL MPI_TYPE_COMMIT( type_yz(0), ierr )
995
996	!
997	!-- Definition of MPI-datatypes for multigrid method (coarser level grids)
998	IF ( psolver == 'multigrid' ) THEN
999	!
1000	!-- Definition of MPI-datatyoe as above, but only 1 ghost level is used
1001	DO i = maximum_grid_level, 1 , -1
1002
1003	ngp_yz(i) = (nzt_l - nzb_l + 2) * (nyn_l - nys_l + 3)
1004
1005	CALL MPI_TYPE_VECTOR( nxr_l-nxl_l+3, nzt_l-nzb_l+2, ngp_yz(i), &
1006	MPI_REAL, type_xz(i), ierr )
1007	CALL MPI_TYPE_COMMIT( type_xz(i), ierr )
1008
1009	CALL MPI_TYPE_VECTOR( 1, ngp_yz(i), ngp_yz(i), MPI_REAL, type_yz(i), &
1010	ierr )
1011	CALL MPI_TYPE_COMMIT( type_yz(i), ierr )
1012
1013	nxl_l = nxl_l / 2
1014	nxr_l = nxr_l / 2
1015	nys_l = nys_l / 2
1016	nyn_l = nyn_l / 2
1017	nzt_l = nzt_l / 2
1018
1019	ENDDO
1020
1021	ENDIF
1022	#endif
1023
1024	#if defined( __parallel ) && ! defined ( __check )
1025	!
1026	!-- Setting of flags for inflow/outflow conditions in case of non-cyclic
1027	!-- horizontal boundary conditions.
1028	IF ( pleft == MPI_PROC_NULL ) THEN
1029	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1030	inflow_l = .TRUE.
1031	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1032	outflow_l = .TRUE.
1033	ENDIF
1034	ENDIF
1035
1036	IF ( pright == MPI_PROC_NULL ) THEN
1037	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1038	outflow_r = .TRUE.
1039	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1040	inflow_r = .TRUE.
1041	ENDIF
1042	ENDIF
1043
1044	IF ( psouth == MPI_PROC_NULL ) THEN
1045	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1046	outflow_s = .TRUE.
1047	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1048	inflow_s = .TRUE.
1049	ENDIF
1050	ENDIF
1051
1052	IF ( pnorth == MPI_PROC_NULL ) THEN
1053	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1054	inflow_n = .TRUE.
1055	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1056	outflow_n = .TRUE.
1057	ENDIF
1058	ENDIF
1059
1060	!
1061	!-- Broadcast the id of the inflow PE
1062	IF ( inflow_l ) THEN
1063	id_inflow_l = myidx
1064	ELSE
1065	id_inflow_l = 0
1066	ENDIF
1067	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1068	CALL MPI_ALLREDUCE( id_inflow_l, id_inflow, 1, MPI_INTEGER, MPI_SUM, &
1069	comm1dx, ierr )
1070
1071	!
1072	!-- Broadcast the id of the recycling plane
1073	!-- WARNING: needs to be adjusted in case of inflows other than from left side!
1074	IF ( NINT( recycling_width / dx ) >= nxl .AND. &
1075	NINT( recycling_width / dx ) <= nxr ) THEN
1076	id_recycling_l = myidx
1077	ELSE
1078	id_recycling_l = 0
1079	ENDIF
1080	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1081	CALL MPI_ALLREDUCE( id_recycling_l, id_recycling, 1, MPI_INTEGER, MPI_SUM, &
1082	comm1dx, ierr )
1083
1084	CALL location_message( 'finished', .TRUE. )
1085
1086	#elif ! defined ( __parallel )
1087	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1088	inflow_l = .TRUE.
1089	outflow_r = .TRUE.
1090	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1091	outflow_l = .TRUE.
1092	inflow_r = .TRUE.
1093	ENDIF
1094
1095	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1096	inflow_n = .TRUE.
1097	outflow_s = .TRUE.
1098	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1099	outflow_n = .TRUE.
1100	inflow_s = .TRUE.
1101	ENDIF
1102	#endif
1103
1104	!
1105	!-- At the inflow or outflow, u or v, respectively, have to be calculated for
1106	!-- one more grid point.
1107	IF ( inflow_l .OR. outflow_l ) THEN
1108	nxlu = nxl + 1
1109	ELSE
1110	nxlu = nxl
1111	ENDIF
1112	IF ( inflow_s .OR. outflow_s ) THEN
1113	nysv = nys + 1
1114	ELSE
1115	nysv = nys
1116	ENDIF
1117
1118	!
1119	!-- Allocate wall flag arrays used in the multigrid solver
1120	IF ( psolver == 'multigrid' ) THEN
1121
1122	DO i = maximum_grid_level, 1, -1
1123
1124	SELECT CASE ( i )
1125
1126	CASE ( 1 )
1127	ALLOCATE( wall_flags_1(nzb:nzt_mg(i)+1, &
1128	nys_mg(i)-1:nyn_mg(i)+1, &
1129	nxl_mg(i)-1:nxr_mg(i)+1) )
1130
1131	CASE ( 2 )
1132	ALLOCATE( wall_flags_2(nzb:nzt_mg(i)+1, &
1133	nys_mg(i)-1:nyn_mg(i)+1, &
1134	nxl_mg(i)-1:nxr_mg(i)+1) )
1135
1136	CASE ( 3 )
1137	ALLOCATE( wall_flags_3(nzb:nzt_mg(i)+1, &
1138	nys_mg(i)-1:nyn_mg(i)+1, &
1139	nxl_mg(i)-1:nxr_mg(i)+1) )
1140
1141	CASE ( 4 )
1142	ALLOCATE( wall_flags_4(nzb:nzt_mg(i)+1, &
1143	nys_mg(i)-1:nyn_mg(i)+1, &
1144	nxl_mg(i)-1:nxr_mg(i)+1) )
1145
1146	CASE ( 5 )
1147	ALLOCATE( wall_flags_5(nzb:nzt_mg(i)+1, &
1148	nys_mg(i)-1:nyn_mg(i)+1, &
1149	nxl_mg(i)-1:nxr_mg(i)+1) )
1150
1151	CASE ( 6 )
1152	ALLOCATE( wall_flags_6(nzb:nzt_mg(i)+1, &
1153	nys_mg(i)-1:nyn_mg(i)+1, &
1154	nxl_mg(i)-1:nxr_mg(i)+1) )
1155
1156	CASE ( 7 )
1157	ALLOCATE( wall_flags_7(nzb:nzt_mg(i)+1, &
1158	nys_mg(i)-1:nyn_mg(i)+1, &
1159	nxl_mg(i)-1:nxr_mg(i)+1) )
1160
1161	CASE ( 8 )
1162	ALLOCATE( wall_flags_8(nzb:nzt_mg(i)+1, &
1163	nys_mg(i)-1:nyn_mg(i)+1, &
1164	nxl_mg(i)-1:nxr_mg(i)+1) )
1165
1166	CASE ( 9 )
1167	ALLOCATE( wall_flags_9(nzb:nzt_mg(i)+1, &
1168	nys_mg(i)-1:nyn_mg(i)+1, &
1169	nxl_mg(i)-1:nxr_mg(i)+1) )
1170
1171	CASE ( 10 )
1172	ALLOCATE( wall_flags_10(nzb:nzt_mg(i)+1, &
1173	nys_mg(i)-1:nyn_mg(i)+1, &
1174	nxl_mg(i)-1:nxr_mg(i)+1) )
1175
1176	CASE DEFAULT
1177	message_string = 'more than 10 multigrid levels'
1178	CALL message( 'init_pegrid', 'PA0238', 1, 2, 0, 6, 0 )
1179
1180	END SELECT
1181
1182	ENDDO
1183
1184	ENDIF
1185
1186	!
1187	!-- Calculate the number of groups into which parallel I/O is split.
1188	!-- The default for files which are opened by all PEs (or where each
1189	!-- PE opens his own independent file) is, that all PEs are doing input/output
1190	!-- in parallel at the same time. This might cause performance or even more
1191	!-- severe problems depending on the configuration of the underlying file
1192	!-- system.
1193	!-- First, set the default:
1194	IF ( maximum_parallel_io_streams == -1 .OR. &
1195	maximum_parallel_io_streams > numprocs ) THEN
1196	maximum_parallel_io_streams = numprocs
1197	ENDIF
1198
1199	!
1200	!-- Now calculate the number of io_blocks and the io_group to which the
1201	!-- respective PE belongs. I/O of the groups is done in serial, but in parallel
1202	!-- for all PEs belonging to the same group. A preliminary setting with myid
1203	!-- based on MPI_COMM_WORLD has been done in parin.
1204	io_blocks = numprocs / maximum_parallel_io_streams
1205	io_group = MOD( myid+1, io_blocks )
1206
1207
1208	END SUBROUTINE init_pegrid

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