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source: palm/trunk/SOURCE/init_pegrid.f90 @ 1563

Last change on this file since 1563 was 1558, checked in by suehring, 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 1558 2015-03-05 16:51:41Z heinze $
27	!
28	! 1557 2015-03-05 16:43:04Z suehring
29	! Adjustment for monotonic limiter
30	!
31	! 1468 2014-09-24 14:06:57Z maronga
32	! Adapted for use on up to 6-digit processor cores
33	!
34	! 1435 2014-07-21 10:37:02Z keck
35	! bugfix: added missing parameter coupling_mode_remote to ONLY-attribute
36	!
37	! 1402 2014-05-09 14:25:13Z raasch
38	! location messages modified
39	!
40	! 1384 2014-05-02 14:31:06Z raasch
41	! location messages added
42	!
43	! 1353 2014-04-08 15:21:23Z heinze
44	! REAL constants provided with KIND-attribute
45	!
46	! 1322 2014-03-20 16:38:49Z raasch
47	! REAL functions provided with KIND-attribute
48	!
49	! 1320 2014-03-20 08:40:49Z raasch
50	! ONLY-attribute added to USE-statements,
51	! kind-parameters added to all INTEGER and REAL declaration statements,
52	! kinds are defined in new module kinds,
53	! revision history before 2012 removed,
54	! comment fields (!:) to be used for variable explanations added to
55	! all variable declaration statements
56	!
57	! 1304 2014-03-12 10:29:42Z raasch
58	! bugfix: single core MPI runs missed some settings of transpose indices
59	!
60	! 1212 2013-08-15 08:46:27Z raasch
61	! error message for poisfft_hybrid removed
62	!
63	! 1159 2013-05-21 11:58:22Z fricke
64	! dirichlet/neumann and neumann/dirichlet removed
65	!
66	! 1139 2013-04-18 07:25:03Z raasch
67	! bugfix for calculating the id of the PE carrying the recycling plane
68	!
69	! 1111 2013-03-08 23:54:10Z raasch
70	! initialization of poisfft moved to module poisfft
71	!
72	! 1092 2013-02-02 11:24:22Z raasch
73	! unused variables removed
74	!
75	! 1056 2012-11-16 15:28:04Z raasch
76	! Indices for arrays n.._mg start from zero due to definition of arrays f2 and
77	! p2 as automatic arrays in recursive subroutine next_mg_level
78	!
79	! 1041 2012-11-06 02:36:29Z raasch
80	! a 2d virtual processor topology is used by default for all machines
81	!
82	! 1036 2012-10-22 13:43:42Z raasch
83	! code put under GPL (PALM 3.9)
84	!
85	! 1003 2012-09-14 14:35:53Z raasch
86	! subdomains must have identical size (grid matching = "match" removed)
87	!
88	! 1001 2012-09-13 14:08:46Z raasch
89	! all actions concerning upstream-spline-method removed
90	!
91	! 978 2012-08-09 08:28:32Z fricke
92	! dirichlet/neumann and neumann/dirichlet added
93	! nxlu and nysv are also calculated for inflow boundary
94	!
95	! 809 2012-01-30 13:32:58Z maronga
96	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
97	!
98	! 807 2012-01-25 11:53:51Z maronga
99	! New cpp directive "__check" implemented which is used by check_namelist_files
100	!
101	! Revision 1.1 1997/07/24 11:15:09 raasch
102	! Initial revision
103	!
104	!
105	! Description:
106	! ------------
107	! Determination of the virtual processor topology (if not prescribed by the
108	! user)and computation of the grid point number and array bounds of the local
109	! domains.
110	!------------------------------------------------------------------------------!
111
112	USE control_parameters, &
113	ONLY: bc_lr, bc_ns, coupling_mode, coupling_mode_remote, &
114	coupling_topology, dt_dosp, gathered_size, grid_level, &
115	grid_level_count, host, inflow_l, inflow_n, inflow_r, inflow_s, &
116	io_blocks, io_group, maximum_grid_level, &
117	maximum_parallel_io_streams, message_string, &
118	mg_switch_to_pe0_level, momentum_advec, psolver, outflow_l, &
119	outflow_n, outflow_r, outflow_s, recycling_width, scalar_advec, &
120	subdomain_size
121
122	USE grid_variables, &
123	ONLY: dx
124
125	USE indices, &
126	ONLY: mg_loc_ind, nbgp, nnx, nny, nnz, nx, nx_a, nx_o, nxl, nxl_mg, &
127	nxlu, nxr, nxr_mg, ny, ny_a, ny_o, nyn, nyn_mg, nys, nys_mg, &
128	nysv, nz, nzb, nzt, nzt_mg, wall_flags_1, wall_flags_2, &
129	wall_flags_3, wall_flags_4, wall_flags_5, wall_flags_6, &
130	wall_flags_7, wall_flags_8, wall_flags_9, wall_flags_10
131
132	USE kinds
133
134	USE pegrid
135
136	USE transpose_indices, &
137	ONLY: nxl_y, nxl_yd, nxl_z, nxr_y, nxr_yd, nxr_z, nyn_x, nyn_z, nys_x,&
138	nys_z, nzb_x, nzb_y, nzb_yd, nzt_x, nzt_yd, nzt_y
139
140	IMPLICIT NONE
141
142	INTEGER(iwp) :: i !:
143	INTEGER(iwp) :: id_inflow_l !:
144	INTEGER(iwp) :: id_recycling_l !:
145	INTEGER(iwp) :: ind(5) !:
146	INTEGER(iwp) :: j !:
147	INTEGER(iwp) :: k !:
148	INTEGER(iwp) :: maximum_grid_level_l !:
149	INTEGER(iwp) :: mg_levels_x !:
150	INTEGER(iwp) :: mg_levels_y !:
151	INTEGER(iwp) :: mg_levels_z !:
152	INTEGER(iwp) :: mg_switch_to_pe0_level_l !:
153	INTEGER(iwp) :: nnx_y !:
154	INTEGER(iwp) :: nnx_z !:
155	INTEGER(iwp) :: nny_x !:
156	INTEGER(iwp) :: nny_z !:
157	INTEGER(iwp) :: nnz_x !:
158	INTEGER(iwp) :: nnz_y !:
159	INTEGER(iwp) :: numproc_sqr !:
160	INTEGER(iwp) :: nxl_l !:
161	INTEGER(iwp) :: nxr_l !:
162	INTEGER(iwp) :: nyn_l !:
163	INTEGER(iwp) :: nys_l !:
164	INTEGER(iwp) :: nzb_l !:
165	INTEGER(iwp) :: nzt_l !:
166	INTEGER(iwp) :: omp_get_num_threads !:
167
168	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: ind_all !:
169	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxlf !:
170	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxrf !:
171	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nynf !:
172	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nysf !:
173
174	INTEGER(iwp), DIMENSION(2) :: pdims_remote !:
175
176	#if defined( __mpi2 )
177	LOGICAL :: found !:
178	#endif
179
180	!
181	!-- Get the number of OpenMP threads
182	!$OMP PARALLEL
183	#if defined( __intel_openmp_bug )
184	threads_per_task = omp_get_num_threads()
185	#else
186	!$ threads_per_task = omp_get_num_threads()
187	#endif
188	!$OMP END PARALLEL
189
190
191	#if defined( __parallel )
192
193	CALL location_message( 'creating virtual PE grids + MPI derived data types', &
194	.FALSE. )
195	!
196	!-- Determine the processor topology or check it, if prescribed by the user
197	IF ( npex == -1 .AND. npey == -1 ) THEN
198
199	!
200	!-- Automatic determination of the topology
201	numproc_sqr = SQRT( REAL( numprocs, KIND=wp ) )
202	pdims(1) = MAX( numproc_sqr , 1 )
203	DO WHILE ( MOD( numprocs , pdims(1) ) /= 0 )
204	pdims(1) = pdims(1) - 1
205	ENDDO
206	pdims(2) = numprocs / pdims(1)
207
208	ELSEIF ( npex /= -1 .AND. npey /= -1 ) THEN
209
210	!
211	!-- Prescribed by user. Number of processors on the prescribed topology
212	!-- must be equal to the number of PEs available to the job
213	IF ( ( npex * npey ) /= numprocs ) THEN
214	WRITE( message_string, * ) 'number of PEs of the prescribed ', &
215	'topology (', npex*npey,') does not match & the number of ', &
216	'PEs available to the job (', numprocs, ')'
217	CALL message( 'init_pegrid', 'PA0221', 1, 2, 0, 6, 0 )
218	ENDIF
219	pdims(1) = npex
220	pdims(2) = npey
221
222	ELSE
223	!
224	!-- If the processor topology is prescribed by the user, the number of
225	!-- PEs must be given in both directions
226	message_string = 'if the processor topology is prescribed by the, ' // &
227	' user& both values of "npex" and "npey" must be given ' // &
228	'in the &NAMELIST-parameter file'
229	CALL message( 'init_pegrid', 'PA0222', 1, 2, 0, 6, 0 )
230
231	ENDIF
232
233	!
234	!-- For communication speedup, set barriers in front of collective
235	!-- communications by default on SGI-type systems
236	IF ( host(3:5) == 'sgi' ) collective_wait = .TRUE.
237
238	!
239	!-- If necessary, set horizontal boundary conditions to non-cyclic
240	IF ( bc_lr /= 'cyclic' ) cyclic(1) = .FALSE.
241	IF ( bc_ns /= 'cyclic' ) cyclic(2) = .FALSE.
242
243
244	#if ! defined( __check)
245	!
246	!-- Create the virtual processor grid
247	CALL MPI_CART_CREATE( comm_palm, ndim, pdims, cyclic, reorder, &
248	comm2d, ierr )
249	CALL MPI_COMM_RANK( comm2d, myid, ierr )
250	WRITE (myid_char,'(''_'',I6.6)') myid
251
252	CALL MPI_CART_COORDS( comm2d, myid, ndim, pcoord, ierr )
253	CALL MPI_CART_SHIFT( comm2d, 0, 1, pleft, pright, ierr )
254	CALL MPI_CART_SHIFT( comm2d, 1, 1, psouth, pnorth, ierr )
255
256	!
257	!-- Determine sub-topologies for transpositions
258	!-- Transposition from z to x:
259	remain_dims(1) = .TRUE.
260	remain_dims(2) = .FALSE.
261	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dx, ierr )
262	CALL MPI_COMM_RANK( comm1dx, myidx, ierr )
263	!
264	!-- Transposition from x to y
265	remain_dims(1) = .FALSE.
266	remain_dims(2) = .TRUE.
267	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dy, ierr )
268	CALL MPI_COMM_RANK( comm1dy, myidy, ierr )
269
270	#endif
271
272	!
273	!-- Calculate array bounds along x-direction for every PE.
274	ALLOCATE( nxlf(0:pdims(1)-1), nxrf(0:pdims(1)-1), nynf(0:pdims(2)-1), &
275	nysf(0:pdims(2)-1) )
276
277	IF ( MOD( nx+1 , pdims(1) ) /= 0 ) THEN
278	WRITE( message_string, * ) 'x-direction: gridpoint number (',nx+1,') ',&
279	'is not an& integral divisor of the number ', &
280	'processors (', pdims(1),')'
281	CALL message( 'init_pegrid', 'PA0225', 1, 2, 0, 6, 0 )
282	ELSE
283	nnx = ( nx + 1 ) / pdims(1)
284	IF ( nnx*pdims(1) - ( nx + 1) > nnx ) THEN
285	WRITE( message_string, * ) 'x-direction: nx does not match the', &
286	'requirements given by the number of PEs &used', &
287	'& please use nx = ', nx - ( pdims(1) - ( nnx*pdims(1) &
288	- ( nx + 1 ) ) ), ' instead of nx =', nx
289	CALL message( 'init_pegrid', 'PA0226', 1, 2, 0, 6, 0 )
290	ENDIF
291	ENDIF
292
293	!
294	!-- Left and right array bounds, number of gridpoints
295	DO i = 0, pdims(1)-1
296	nxlf(i) = i * nnx
297	nxrf(i) = ( i + 1 ) * nnx - 1
298	ENDDO
299
300	!
301	!-- Calculate array bounds in y-direction for every PE.
302	IF ( MOD( ny+1 , pdims(2) ) /= 0 ) THEN
303	WRITE( message_string, * ) 'y-direction: gridpoint number (',ny+1,') ', &
304	'is not an& integral divisor of the number of', &
305	'processors (', pdims(2),')'
306	CALL message( 'init_pegrid', 'PA0227', 1, 2, 0, 6, 0 )
307	ELSE
308	nny = ( ny + 1 ) / pdims(2)
309	IF ( nny*pdims(2) - ( ny + 1) > nny ) THEN
310	WRITE( message_string, * ) 'y-direction: ny does not match the', &
311	'requirements given by the number of PEs &used ', &
312	'& please use ny = ', ny - ( pdims(2) - ( nnx*pdims(2) &
313	- ( ny + 1 ) ) ), ' instead of ny =', ny
314	CALL message( 'init_pegrid', 'PA0228', 1, 2, 0, 6, 0 )
315	ENDIF
316	ENDIF
317
318	!
319	!-- South and north array bounds
320	DO j = 0, pdims(2)-1
321	nysf(j) = j * nny
322	nynf(j) = ( j + 1 ) * nny - 1
323	ENDDO
324
325	!
326	!-- Local array bounds of the respective PEs
327	nxl = nxlf(pcoord(1))
328	nxr = nxrf(pcoord(1))
329	nys = nysf(pcoord(2))
330	nyn = nynf(pcoord(2))
331	nzb = 0
332	nzt = nz
333	nnz = nz
334
335	!
336	!-- Set switches to define if the PE is situated at the border of the virtual
337	!-- processor grid
338	IF ( nxl == 0 ) left_border_pe = .TRUE.
339	IF ( nxr == nx ) right_border_pe = .TRUE.
340	IF ( nys == 0 ) south_border_pe = .TRUE.
341	IF ( nyn == ny ) north_border_pe = .TRUE.
342
343	!
344	!-- Calculate array bounds and gridpoint numbers for the transposed arrays
345	!-- (needed in the pressure solver)
346	!-- For the transposed arrays, cyclic boundaries as well as top and bottom
347	!-- boundaries are omitted, because they are obstructive to the transposition
348
349	!
350	!-- 1. transposition z --> x
351	!-- This transposition is not neccessary in case of a 1d-decomposition along x
352	nys_x = nys
353	nyn_x = nyn
354	nny_x = nny
355	nnz_x = nz / pdims(1)
356	nzb_x = 1 + myidx * nnz_x
357	nzt_x = ( myidx + 1 ) * nnz_x
358	sendrecvcount_zx = nnx * nny * nnz_x
359
360	IF ( pdims(2) /= 1 ) THEN
361	IF ( MOD( nz , pdims(1) ) /= 0 ) THEN
362	WRITE( message_string, * ) 'transposition z --> x:', &
363	'&nz=',nz,' is not an integral divisior of pdims(1)=', &
364	pdims(1)
365	CALL message( 'init_pegrid', 'PA0230', 1, 2, 0, 6, 0 )
366	ENDIF
367	ENDIF
368
369	!
370	!-- 2. transposition x --> y
371	nnz_y = nnz_x
372	nzb_y = nzb_x
373	nzt_y = nzt_x
374	IF ( MOD( nx+1 , pdims(2) ) /= 0 ) THEN
375	WRITE( message_string, * ) 'transposition x --> y:', &
376	'&nx+1=',nx+1,' is not an integral divisor of ',&
377	'pdims(2)=',pdims(2)
378	CALL message( 'init_pegrid', 'PA0231', 1, 2, 0, 6, 0 )
379	ENDIF
380	nnx_y = (nx+1) / pdims(2)
381	nxl_y = myidy * nnx_y
382	nxr_y = ( myidy + 1 ) * nnx_y - 1
383	sendrecvcount_xy = nnx_y * nny_x * nnz_y
384
385	!
386	!-- 3. transposition y --> z (ELSE: x --> y in case of 1D-decomposition
387	!-- along x)
388	nnx_z = nnx_y
389	nxl_z = nxl_y
390	nxr_z = nxr_y
391	nny_z = (ny+1) / pdims(1)
392	nys_z = myidx * nny_z
393	nyn_z = ( myidx + 1 ) * nny_z - 1
394	sendrecvcount_yz = nnx_y * nny_z * nnz_y
395
396	IF ( pdims(2) /= 1 ) THEN
397	!
398	!-- y --> z
399	!-- This transposition is not neccessary in case of a 1d-decomposition
400	!-- along x, except that the uptream-spline method is switched on
401	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
402	WRITE( message_string, * ) 'transposition y --> z:', &
403	'& ny+1=',ny+1,' is not an integral divisor of ',&
404	'pdims(1)=',pdims(1)
405	CALL message( 'init_pegrid', 'PA0232', 1, 2, 0, 6, 0 )
406	ENDIF
407
408	ELSE
409	!
410	!-- x --> y. This condition must be fulfilled for a 1D-decomposition along x
411	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
412	WRITE( message_string, * ) 'transposition x --> y:', &
413	'& ny+1=',ny+1,' is not an integral divisor of ',&
414	'pdims(1)=',pdims(1)
415	CALL message( 'init_pegrid', 'PA0233', 1, 2, 0, 6, 0 )
416	ENDIF
417
418	ENDIF
419
420	!
421	!-- Indices for direct transpositions z --> y (used for calculating spectra)
422	IF ( dt_dosp /= 9999999.9_wp ) THEN
423	IF ( MOD( nz, pdims(2) ) /= 0 ) THEN
424	WRITE( message_string, * ) 'direct transposition z --> y (needed ', &
425	'for spectra):& nz=',nz,' is not an integral divisor of ',&
426	'pdims(2)=',pdims(2)
427	CALL message( 'init_pegrid', 'PA0234', 1, 2, 0, 6, 0 )
428	ELSE
429	nxl_yd = nxl
430	nxr_yd = nxr
431	nzb_yd = 1 + myidy * ( nz / pdims(2) )
432	nzt_yd = ( myidy + 1 ) * ( nz / pdims(2) )
433	sendrecvcount_zyd = nnx * nny * ( nz / pdims(2) )
434	ENDIF
435	ENDIF
436
437	!
438	!-- Indices for direct transpositions y --> x (they are only possible in case
439	!-- of a 1d-decomposition along x)
440	IF ( pdims(2) == 1 ) THEN
441	nny_x = nny / pdims(1)
442	nys_x = myid * nny_x
443	nyn_x = ( myid + 1 ) * nny_x - 1
444	nzb_x = 1
445	nzt_x = nz
446	sendrecvcount_xy = nnx * nny_x * nz
447	ENDIF
448
449	!
450	!-- Indices for direct transpositions x --> y (they are only possible in case
451	!-- of a 1d-decomposition along y)
452	IF ( pdims(1) == 1 ) THEN
453	nnx_y = nnx / pdims(2)
454	nxl_y = myid * nnx_y
455	nxr_y = ( myid + 1 ) * nnx_y - 1
456	nzb_y = 1
457	nzt_y = nz
458	sendrecvcount_xy = nnx_y * nny * nz
459	ENDIF
460
461	!
462	!-- Arrays for storing the array bounds are needed any more
463	DEALLOCATE( nxlf , nxrf , nynf , nysf )
464
465
466	#if ! defined( __check)
467	!
468	!-- Collect index bounds from other PEs (to be written to restart file later)
469	ALLOCATE( hor_index_bounds(4,0:numprocs-1) )
470
471	IF ( myid == 0 ) THEN
472
473	hor_index_bounds(1,0) = nxl
474	hor_index_bounds(2,0) = nxr
475	hor_index_bounds(3,0) = nys
476	hor_index_bounds(4,0) = nyn
477
478	!
479	!-- Receive data from all other PEs
480	DO i = 1, numprocs-1
481	CALL MPI_RECV( ibuf, 4, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
482	ierr )
483	hor_index_bounds(:,i) = ibuf(1:4)
484	ENDDO
485
486	ELSE
487	!
488	!-- Send index bounds to PE0
489	ibuf(1) = nxl
490	ibuf(2) = nxr
491	ibuf(3) = nys
492	ibuf(4) = nyn
493	CALL MPI_SEND( ibuf, 4, MPI_INTEGER, 0, myid, comm2d, ierr )
494
495	ENDIF
496
497	#endif
498
499	#if defined( __print )
500	!
501	!-- Control output
502	IF ( myid == 0 ) THEN
503	PRINT, ' processor topology *'
504	PRINT*, ' '
505	PRINT*, 'myid pcoord left right south north idx idy nxl: nxr',&
506	&' nys: nyn'
507	PRINT*, '------------------------------------------------------------',&
508	&'-----------'
509	WRITE (*,1000) 0, pcoord(1), pcoord(2), pleft, pright, psouth, pnorth, &
510	myidx, myidy, nxl, nxr, nys, nyn
511	1000 FORMAT (I4,2X,'(',I3,',',I3,')',3X,I4,2X,I4,3X,I4,2X,I4,2X,I3,1X,I3, &
512	2(2X,I4,':',I4))
513
514	!
515	!-- Receive data from the other PEs
516	DO i = 1,numprocs-1
517	CALL MPI_RECV( ibuf, 12, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
518	ierr )
519	WRITE (*,1000) i, ( ibuf(j) , j = 1,12 )
520	ENDDO
521	ELSE
522
523	!
524	!-- Send data to PE0
525	ibuf(1) = pcoord(1); ibuf(2) = pcoord(2); ibuf(3) = pleft
526	ibuf(4) = pright; ibuf(5) = psouth; ibuf(6) = pnorth; ibuf(7) = myidx
527	ibuf(8) = myidy; ibuf(9) = nxl; ibuf(10) = nxr; ibuf(11) = nys
528	ibuf(12) = nyn
529	CALL MPI_SEND( ibuf, 12, MPI_INTEGER, 0, myid, comm2d, ierr )
530	ENDIF
531	#endif
532
533	#if defined( __parallel ) && ! defined( __check)
534	#if defined( __mpi2 )
535	!
536	!-- In case of coupled runs, get the port name on PE0 of the atmosphere model
537	!-- and pass it to PE0 of the ocean model
538	IF ( myid == 0 ) THEN
539
540	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
541
542	CALL MPI_OPEN_PORT( MPI_INFO_NULL, port_name, ierr )
543
544	CALL MPI_PUBLISH_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, &
545	ierr )
546
547	!
548	!-- Write a flag file for the ocean model and the other atmosphere
549	!-- processes.
550	!-- There seems to be a bug in MPICH2 which causes hanging processes
551	!-- in case that execution of LOOKUP_NAME is continued too early
552	!-- (i.e. before the port has been created)
553	OPEN( 90, FILE='COUPLING_PORT_OPENED', FORM='FORMATTED' )
554	WRITE ( 90, '(''TRUE'')' )
555	CLOSE ( 90 )
556
557	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
558
559	!
560	!-- Continue only if the atmosphere model has created the port.
561	!-- There seems to be a bug in MPICH2 which causes hanging processes
562	!-- in case that execution of LOOKUP_NAME is continued too early
563	!-- (i.e. before the port has been created)
564	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
565	DO WHILE ( .NOT. found )
566	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
567	ENDDO
568
569	CALL MPI_LOOKUP_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, ierr )
570
571	ENDIF
572
573	ENDIF
574
575	!
576	!-- In case of coupled runs, establish the connection between the atmosphere
577	!-- and the ocean model and define the intercommunicator (comm_inter)
578	CALL MPI_BARRIER( comm2d, ierr )
579	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
580
581	CALL MPI_COMM_ACCEPT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
582	comm_inter, ierr )
583	coupling_mode_remote = 'ocean_to_atmosphere'
584
585	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
586
587	CALL MPI_COMM_CONNECT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
588	comm_inter, ierr )
589	coupling_mode_remote = 'atmosphere_to_ocean'
590
591	ENDIF
592	#endif
593
594	!
595	!-- Determine the number of ghost point layers
596	IF ( scalar_advec == 'ws-scheme' .OR. &
597	scalar_advec == 'ws-scheme-mono' .OR. &
598	momentum_advec == 'ws-scheme' ) THEN
599	nbgp = 3
600	ELSE
601	nbgp = 1
602	ENDIF
603
604	!
605	!-- Create a new MPI derived datatype for the exchange of surface (xy) data,
606	!-- which is needed for coupled atmosphere-ocean runs.
607	!-- First, calculate number of grid points of an xy-plane.
608	ngp_xy = ( nxr - nxl + 1 + 2 * nbgp ) * ( nyn - nys + 1 + 2 * nbgp )
609	CALL MPI_TYPE_VECTOR( ngp_xy, 1, nzt-nzb+2, MPI_REAL, type_xy, ierr )
610	CALL MPI_TYPE_COMMIT( type_xy, ierr )
611
612	IF ( TRIM( coupling_mode ) /= 'uncoupled' ) THEN
613
614	!
615	!-- Pass the number of grid points of the atmosphere model to
616	!-- the ocean model and vice versa
617	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
618
619	nx_a = nx
620	ny_a = ny
621
622	IF ( myid == 0 ) THEN
623
624	CALL MPI_SEND( nx_a, 1, MPI_INTEGER, numprocs, 1, comm_inter, &
625	ierr )
626	CALL MPI_SEND( ny_a, 1, MPI_INTEGER, numprocs, 2, comm_inter, &
627	ierr )
628	CALL MPI_SEND( pdims, 2, MPI_INTEGER, numprocs, 3, comm_inter, &
629	ierr )
630	CALL MPI_RECV( nx_o, 1, MPI_INTEGER, numprocs, 4, comm_inter, &
631	status, ierr )
632	CALL MPI_RECV( ny_o, 1, MPI_INTEGER, numprocs, 5, comm_inter, &
633	status, ierr )
634	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, numprocs, 6, &
635	comm_inter, status, ierr )
636	ENDIF
637
638	CALL MPI_BCAST( nx_o, 1, MPI_INTEGER, 0, comm2d, ierr )
639	CALL MPI_BCAST( ny_o, 1, MPI_INTEGER, 0, comm2d, ierr )
640	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr )
641
642	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
643
644	nx_o = nx
645	ny_o = ny
646
647	IF ( myid == 0 ) THEN
648
649	CALL MPI_RECV( nx_a, 1, MPI_INTEGER, 0, 1, comm_inter, status, &
650	ierr )
651	CALL MPI_RECV( ny_a, 1, MPI_INTEGER, 0, 2, comm_inter, status, &
652	ierr )
653	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, 0, 3, comm_inter, &
654	status, ierr )
655	CALL MPI_SEND( nx_o, 1, MPI_INTEGER, 0, 4, comm_inter, ierr )
656	CALL MPI_SEND( ny_o, 1, MPI_INTEGER, 0, 5, comm_inter, ierr )
657	CALL MPI_SEND( pdims, 2, MPI_INTEGER, 0, 6, comm_inter, ierr )
658	ENDIF
659
660	CALL MPI_BCAST( nx_a, 1, MPI_INTEGER, 0, comm2d, ierr)
661	CALL MPI_BCAST( ny_a, 1, MPI_INTEGER, 0, comm2d, ierr)
662	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr)
663
664	ENDIF
665
666	ngp_a = ( nx_a+1 + 2 * nbgp ) * ( ny_a+1 + 2 * nbgp )
667	ngp_o = ( nx_o+1 + 2 * nbgp ) * ( ny_o+1 + 2 * nbgp )
668
669	!
670	!-- Determine if the horizontal grid and the number of PEs in ocean and
671	!-- atmosphere is same or not
672	IF ( nx_o == nx_a .AND. ny_o == ny_a .AND. &
673	pdims(1) == pdims_remote(1) .AND. pdims(2) == pdims_remote(2) ) &
674	THEN
675	coupling_topology = 0
676	ELSE
677	coupling_topology = 1
678	ENDIF
679
680	!
681	!-- Determine the target PEs for the exchange between ocean and
682	!-- atmosphere (comm2d)
683	IF ( coupling_topology == 0 ) THEN
684	!
685	!-- In case of identical topologies, every atmosphere PE has exactly one
686	!-- ocean PE counterpart and vice versa
687	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
688	target_id = myid + numprocs
689	ELSE
690	target_id = myid
691	ENDIF
692
693	ELSE
694	!
695	!-- In case of nonequivalent topology in ocean and atmosphere only for
696	!-- PE0 in ocean and PE0 in atmosphere a target_id is needed, since
697	!-- data echxchange between ocean and atmosphere will be done only
698	!-- between these PEs.
699	IF ( myid == 0 ) THEN
700
701	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
702	target_id = numprocs
703	ELSE
704	target_id = 0
705	ENDIF
706
707	ENDIF
708
709	ENDIF
710
711	ENDIF
712
713
714	#endif
715
716	#else
717
718	!
719	!-- Array bounds when running on a single PE (respectively a non-parallel
720	!-- machine)
721	nxl = 0
722	nxr = nx
723	nnx = nxr - nxl + 1
724	nys = 0
725	nyn = ny
726	nny = nyn - nys + 1
727	nzb = 0
728	nzt = nz
729	nnz = nz
730
731	ALLOCATE( hor_index_bounds(4,0:0) )
732	hor_index_bounds(1,0) = nxl
733	hor_index_bounds(2,0) = nxr
734	hor_index_bounds(3,0) = nys
735	hor_index_bounds(4,0) = nyn
736
737	!
738	!-- Array bounds for the pressure solver (in the parallel code, these bounds
739	!-- are the ones for the transposed arrays)
740	nys_x = nys
741	nyn_x = nyn
742	nzb_x = nzb + 1
743	nzt_x = nzt
744
745	nxl_y = nxl
746	nxr_y = nxr
747	nzb_y = nzb + 1
748	nzt_y = nzt
749
750	nxl_z = nxl
751	nxr_z = nxr
752	nys_z = nys
753	nyn_z = nyn
754
755	#endif
756
757	!
758	!-- Calculate number of grid levels necessary for the multigrid poisson solver
759	!-- as well as the gridpoint indices on each level
760	IF ( psolver == 'multigrid' ) THEN
761
762	!
763	!-- First calculate number of possible grid levels for the subdomains
764	mg_levels_x = 1
765	mg_levels_y = 1
766	mg_levels_z = 1
767
768	i = nnx
769	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
770	i = i / 2
771	mg_levels_x = mg_levels_x + 1
772	ENDDO
773
774	j = nny
775	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
776	j = j / 2
777	mg_levels_y = mg_levels_y + 1
778	ENDDO
779
780	k = nz ! do not use nnz because it might be > nz due to transposition
781	! requirements
782	DO WHILE ( MOD( k, 2 ) == 0 .AND. k /= 2 )
783	k = k / 2
784	mg_levels_z = mg_levels_z + 1
785	ENDDO
786
787	maximum_grid_level = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
788
789	!
790	!-- Find out, if the total domain allows more levels. These additional
791	!-- levels are identically processed on all PEs.
792	IF ( numprocs > 1 .AND. mg_switch_to_pe0_level /= -1 ) THEN
793
794	IF ( mg_levels_z > MIN( mg_levels_x, mg_levels_y ) ) THEN
795
796	mg_switch_to_pe0_level_l = maximum_grid_level
797
798	mg_levels_x = 1
799	mg_levels_y = 1
800
801	i = nx+1
802	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
803	i = i / 2
804	mg_levels_x = mg_levels_x + 1
805	ENDDO
806
807	j = ny+1
808	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
809	j = j / 2
810	mg_levels_y = mg_levels_y + 1
811	ENDDO
812
813	maximum_grid_level_l = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
814
815	IF ( maximum_grid_level_l > mg_switch_to_pe0_level_l ) THEN
816	mg_switch_to_pe0_level_l = maximum_grid_level_l - &
817	mg_switch_to_pe0_level_l + 1
818	ELSE
819	mg_switch_to_pe0_level_l = 0
820	ENDIF
821
822	ELSE
823	mg_switch_to_pe0_level_l = 0
824	maximum_grid_level_l = maximum_grid_level
825
826	ENDIF
827
828	!
829	!-- Use switch level calculated above only if it is not pre-defined
830	!-- by user
831	IF ( mg_switch_to_pe0_level == 0 ) THEN
832	IF ( mg_switch_to_pe0_level_l /= 0 ) THEN
833	mg_switch_to_pe0_level = mg_switch_to_pe0_level_l
834	maximum_grid_level = maximum_grid_level_l
835	ENDIF
836
837	ELSE
838	!
839	!-- Check pre-defined value and reset to default, if neccessary
840	IF ( mg_switch_to_pe0_level < mg_switch_to_pe0_level_l .OR. &
841	mg_switch_to_pe0_level >= maximum_grid_level_l ) THEN
842	message_string = 'mg_switch_to_pe0_level ' // &
843	'out of range and reset to default (=0)'
844	CALL message( 'init_pegrid', 'PA0235', 0, 1, 0, 6, 0 )
845	mg_switch_to_pe0_level = 0
846	ELSE
847	!
848	!-- Use the largest number of possible levels anyway and recalculate
849	!-- the switch level to this largest number of possible values
850	maximum_grid_level = maximum_grid_level_l
851
852	ENDIF
853
854	ENDIF
855
856	ENDIF
857
858	ALLOCATE( grid_level_count(maximum_grid_level), &
859	nxl_mg(0:maximum_grid_level), nxr_mg(0:maximum_grid_level), &
860	nyn_mg(0:maximum_grid_level), nys_mg(0:maximum_grid_level), &
861	nzt_mg(0:maximum_grid_level) )
862
863	grid_level_count = 0
864	!
865	!-- Index zero required as dummy due to definition of arrays f2 and p2 in
866	!-- recursive subroutine next_mg_level
867	nxl_mg(0) = 0; nxr_mg(0) = 0; nyn_mg(0) = 0; nys_mg(0) = 0; nzt_mg(0) = 0
868
869	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzt_l = nzt
870
871	DO i = maximum_grid_level, 1 , -1
872
873	IF ( i == mg_switch_to_pe0_level ) THEN
874	#if defined( __parallel ) && ! defined( __check )
875	!
876	!-- Save the grid size of the subdomain at the switch level, because
877	!-- it is needed in poismg.
878	ind(1) = nxl_l; ind(2) = nxr_l
879	ind(3) = nys_l; ind(4) = nyn_l
880	ind(5) = nzt_l
881	ALLOCATE( ind_all(5*numprocs), mg_loc_ind(5,0:numprocs-1) )
882	CALL MPI_ALLGATHER( ind, 5, MPI_INTEGER, ind_all, 5, &
883	MPI_INTEGER, comm2d, ierr )
884	DO j = 0, numprocs-1
885	DO k = 1, 5
886	mg_loc_ind(k,j) = ind_all(k+j*5)
887	ENDDO
888	ENDDO
889	DEALLOCATE( ind_all )
890	!
891	!-- Calculate the grid size of the total domain
892	nxr_l = ( nxr_l-nxl_l+1 ) * pdims(1) - 1
893	nxl_l = 0
894	nyn_l = ( nyn_l-nys_l+1 ) * pdims(2) - 1
895	nys_l = 0
896	!
897	!-- The size of this gathered array must not be larger than the
898	!-- array tend, which is used in the multigrid scheme as a temporary
899	!-- array. Therefore the subdomain size of an PE is calculated and
900	!-- the size of the gathered grid. These values are used in
901	!-- routines pres and poismg
902	subdomain_size = ( nxr - nxl + 2 * nbgp + 1 ) * &
903	( nyn - nys + 2 * nbgp + 1 ) * ( nzt - nzb + 2 )
904	gathered_size = ( nxr_l - nxl_l + 3 ) * ( nyn_l - nys_l + 3 ) * &
905	( nzt_l - nzb + 2 )
906
907	#elif ! defined ( __parallel )
908	message_string = 'multigrid gather/scatter impossible ' // &
909	'in non parallel mode'
910	CALL message( 'init_pegrid', 'PA0237', 1, 2, 0, 6, 0 )
911	#endif
912	ENDIF
913
914	nxl_mg(i) = nxl_l
915	nxr_mg(i) = nxr_l
916	nys_mg(i) = nys_l
917	nyn_mg(i) = nyn_l
918	nzt_mg(i) = nzt_l
919
920	nxl_l = nxl_l / 2
921	nxr_l = nxr_l / 2
922	nys_l = nys_l / 2
923	nyn_l = nyn_l / 2
924	nzt_l = nzt_l / 2
925
926	ENDDO
927
928	!
929	!-- Temporary problem: Currently calculation of maxerror iin routine poismg crashes
930	!-- if grid data are collected on PE0 already on the finest grid level.
931	!-- To be solved later.
932	IF ( maximum_grid_level == mg_switch_to_pe0_level ) THEN
933	message_string = 'grid coarsening on subdomain level cannot be performed'
934	CALL message( 'poismg', 'PA0236', 1, 2, 0, 6, 0 )
935	ENDIF
936
937	ELSE
938
939	maximum_grid_level = 0
940
941	ENDIF
942
943	!
944	!-- Default level 0 tells exchange_horiz that all ghost planes have to be
945	!-- exchanged. grid_level is adjusted in poismg, where only one ghost plane
946	!-- is required.
947	grid_level = 0
948
949	#if defined( __parallel ) && ! defined ( __check )
950	!
951	!-- Gridpoint number for the exchange of ghost points (y-line for 2D-arrays)
952	ngp_y = nyn - nys + 1 + 2 * nbgp
953
954	!
955	!-- Define new MPI derived datatypes for the exchange of ghost points in
956	!-- x- and y-direction for 2D-arrays (line)
957	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_REAL, type_x, &
958	ierr )
959	CALL MPI_TYPE_COMMIT( type_x, ierr )
960	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_INTEGER, &
961	type_x_int, ierr )
962	CALL MPI_TYPE_COMMIT( type_x_int, ierr )
963
964	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_REAL, type_y, ierr )
965	CALL MPI_TYPE_COMMIT( type_y, ierr )
966	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_INTEGER, type_y_int, ierr )
967	CALL MPI_TYPE_COMMIT( type_y_int, ierr )
968
969
970	!
971	!-- Calculate gridpoint numbers for the exchange of ghost points along x
972	!-- (yz-plane for 3D-arrays) and define MPI derived data type(s) for the
973	!-- exchange of ghost points in y-direction (xz-plane).
974	!-- Do these calculations for the model grid and (if necessary) also
975	!-- for the coarser grid levels used in the multigrid method
976	ALLOCATE ( ngp_yz(0:maximum_grid_level), type_xz(0:maximum_grid_level),&
977	type_yz(0:maximum_grid_level) )
978
979	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzb_l = nzb; nzt_l = nzt
980
981	!
982	!-- Discern between the model grid, which needs nbgp ghost points and
983	!-- grid levels for the multigrid scheme. In the latter case only one
984	!-- ghost point is necessary.
985	!-- First definition of MPI-datatypes for exchange of ghost layers on normal
986	!-- grid. The following loop is needed for data exchange in poismg.f90.
987	!
988	!-- Determine number of grid points of yz-layer for exchange
989	ngp_yz(0) = (nzt - nzb + 2) * (nyn - nys + 1 + 2 * nbgp)
990
991	!
992	!-- Define an MPI-datatype for the exchange of left/right boundaries.
993	!-- Although data are contiguous in physical memory (which does not
994	!-- necessarily require an MPI-derived datatype), the data exchange between
995	!-- left and right PE's using the MPI-derived type is 10% faster than without.
996	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2nbgp, nbgp(nzt-nzb+2), ngp_yz(0), &
997	MPI_REAL, type_xz(0), ierr )
998	CALL MPI_TYPE_COMMIT( type_xz(0), ierr )
999
1000	CALL MPI_TYPE_VECTOR( nbgp, ngp_yz(0), ngp_yz(0), MPI_REAL, type_yz(0), &
1001	ierr )
1002	CALL MPI_TYPE_COMMIT( type_yz(0), ierr )
1003
1004	!
1005	!-- Definition of MPI-datatypes for multigrid method (coarser level grids)
1006	IF ( psolver == 'multigrid' ) THEN
1007	!
1008	!-- Definition of MPI-datatyoe as above, but only 1 ghost level is used
1009	DO i = maximum_grid_level, 1 , -1
1010
1011	ngp_yz(i) = (nzt_l - nzb_l + 2) * (nyn_l - nys_l + 3)
1012
1013	CALL MPI_TYPE_VECTOR( nxr_l-nxl_l+3, nzt_l-nzb_l+2, ngp_yz(i), &
1014	MPI_REAL, type_xz(i), ierr )
1015	CALL MPI_TYPE_COMMIT( type_xz(i), ierr )
1016
1017	CALL MPI_TYPE_VECTOR( 1, ngp_yz(i), ngp_yz(i), MPI_REAL, type_yz(i), &
1018	ierr )
1019	CALL MPI_TYPE_COMMIT( type_yz(i), ierr )
1020
1021	nxl_l = nxl_l / 2
1022	nxr_l = nxr_l / 2
1023	nys_l = nys_l / 2
1024	nyn_l = nyn_l / 2
1025	nzt_l = nzt_l / 2
1026
1027	ENDDO
1028
1029	ENDIF
1030	#endif
1031
1032	#if defined( __parallel ) && ! defined ( __check )
1033	!
1034	!-- Setting of flags for inflow/outflow conditions in case of non-cyclic
1035	!-- horizontal boundary conditions.
1036	IF ( pleft == MPI_PROC_NULL ) THEN
1037	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1038	inflow_l = .TRUE.
1039	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1040	outflow_l = .TRUE.
1041	ENDIF
1042	ENDIF
1043
1044	IF ( pright == MPI_PROC_NULL ) THEN
1045	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1046	outflow_r = .TRUE.
1047	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1048	inflow_r = .TRUE.
1049	ENDIF
1050	ENDIF
1051
1052	IF ( psouth == MPI_PROC_NULL ) THEN
1053	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1054	outflow_s = .TRUE.
1055	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1056	inflow_s = .TRUE.
1057	ENDIF
1058	ENDIF
1059
1060	IF ( pnorth == MPI_PROC_NULL ) THEN
1061	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1062	inflow_n = .TRUE.
1063	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1064	outflow_n = .TRUE.
1065	ENDIF
1066	ENDIF
1067
1068	!
1069	!-- Broadcast the id of the inflow PE
1070	IF ( inflow_l ) THEN
1071	id_inflow_l = myidx
1072	ELSE
1073	id_inflow_l = 0
1074	ENDIF
1075	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1076	CALL MPI_ALLREDUCE( id_inflow_l, id_inflow, 1, MPI_INTEGER, MPI_SUM, &
1077	comm1dx, ierr )
1078
1079	!
1080	!-- Broadcast the id of the recycling plane
1081	!-- WARNING: needs to be adjusted in case of inflows other than from left side!
1082	IF ( NINT( recycling_width / dx ) >= nxl .AND. &
1083	NINT( recycling_width / dx ) <= nxr ) THEN
1084	id_recycling_l = myidx
1085	ELSE
1086	id_recycling_l = 0
1087	ENDIF
1088	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1089	CALL MPI_ALLREDUCE( id_recycling_l, id_recycling, 1, MPI_INTEGER, MPI_SUM, &
1090	comm1dx, ierr )
1091
1092	CALL location_message( 'finished', .TRUE. )
1093
1094	#elif ! defined ( __parallel )
1095	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1096	inflow_l = .TRUE.
1097	outflow_r = .TRUE.
1098	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1099	outflow_l = .TRUE.
1100	inflow_r = .TRUE.
1101	ENDIF
1102
1103	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1104	inflow_n = .TRUE.
1105	outflow_s = .TRUE.
1106	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1107	outflow_n = .TRUE.
1108	inflow_s = .TRUE.
1109	ENDIF
1110	#endif
1111
1112	!
1113	!-- At the inflow or outflow, u or v, respectively, have to be calculated for
1114	!-- one more grid point.
1115	IF ( inflow_l .OR. outflow_l ) THEN
1116	nxlu = nxl + 1
1117	ELSE
1118	nxlu = nxl
1119	ENDIF
1120	IF ( inflow_s .OR. outflow_s ) THEN
1121	nysv = nys + 1
1122	ELSE
1123	nysv = nys
1124	ENDIF
1125
1126	!
1127	!-- Allocate wall flag arrays used in the multigrid solver
1128	IF ( psolver == 'multigrid' ) THEN
1129
1130	DO i = maximum_grid_level, 1, -1
1131
1132	SELECT CASE ( i )
1133
1134	CASE ( 1 )
1135	ALLOCATE( wall_flags_1(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 ( 2 )
1140	ALLOCATE( wall_flags_2(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 ( 3 )
1145	ALLOCATE( wall_flags_3(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 ( 4 )
1150	ALLOCATE( wall_flags_4(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 ( 5 )
1155	ALLOCATE( wall_flags_5(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 ( 6 )
1160	ALLOCATE( wall_flags_6(nzb:nzt_mg(i)+1, &
1161	nys_mg(i)-1:nyn_mg(i)+1, &
1162	nxl_mg(i)-1:nxr_mg(i)+1) )
1163
1164	CASE ( 7 )
1165	ALLOCATE( wall_flags_7(nzb:nzt_mg(i)+1, &
1166	nys_mg(i)-1:nyn_mg(i)+1, &
1167	nxl_mg(i)-1:nxr_mg(i)+1) )
1168
1169	CASE ( 8 )
1170	ALLOCATE( wall_flags_8(nzb:nzt_mg(i)+1, &
1171	nys_mg(i)-1:nyn_mg(i)+1, &
1172	nxl_mg(i)-1:nxr_mg(i)+1) )
1173
1174	CASE ( 9 )
1175	ALLOCATE( wall_flags_9(nzb:nzt_mg(i)+1, &
1176	nys_mg(i)-1:nyn_mg(i)+1, &
1177	nxl_mg(i)-1:nxr_mg(i)+1) )
1178
1179	CASE ( 10 )
1180	ALLOCATE( wall_flags_10(nzb:nzt_mg(i)+1, &
1181	nys_mg(i)-1:nyn_mg(i)+1, &
1182	nxl_mg(i)-1:nxr_mg(i)+1) )
1183
1184	CASE DEFAULT
1185	message_string = 'more than 10 multigrid levels'
1186	CALL message( 'init_pegrid', 'PA0238', 1, 2, 0, 6, 0 )
1187
1188	END SELECT
1189
1190	ENDDO
1191
1192	ENDIF
1193
1194	!
1195	!-- Calculate the number of groups into which parallel I/O is split.
1196	!-- The default for files which are opened by all PEs (or where each
1197	!-- PE opens his own independent file) is, that all PEs are doing input/output
1198	!-- in parallel at the same time. This might cause performance or even more
1199	!-- severe problems depending on the configuration of the underlying file
1200	!-- system.
1201	!-- First, set the default:
1202	IF ( maximum_parallel_io_streams == -1 .OR. &
1203	maximum_parallel_io_streams > numprocs ) THEN
1204	maximum_parallel_io_streams = numprocs
1205	ENDIF
1206
1207	!
1208	!-- Now calculate the number of io_blocks and the io_group to which the
1209	!-- respective PE belongs. I/O of the groups is done in serial, but in parallel
1210	!-- for all PEs belonging to the same group. A preliminary setting with myid
1211	!-- based on MPI_COMM_WORLD has been done in parin.
1212	io_blocks = numprocs / maximum_parallel_io_streams
1213	io_group = MOD( myid+1, io_blocks )
1214
1215
1216	END SUBROUTINE init_pegrid

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