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source: palm/trunk/SOURCE/init_pegrid.f90 @ 1568

Last change on this file since 1568 was 1566, 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 1566 2015-03-09 21:00:32Z suehring $
27	!
28	! 1565 2015-03-09 20:59:31Z suehring
29	! Refine if-clause for setting nbgp.
30	!
31	! 1557 2015-03-05 16:43:04Z suehring
32	! Adjustment for monotonic limiter
33	!
34	! 1468 2014-09-24 14:06:57Z maronga
35	! Adapted for use on up to 6-digit processor cores
36	!
37	! 1435 2014-07-21 10:37:02Z keck
38	! bugfix: added missing parameter coupling_mode_remote to ONLY-attribute
39	!
40	! 1402 2014-05-09 14:25:13Z raasch
41	! location messages modified
42	!
43	! 1384 2014-05-02 14:31:06Z raasch
44	! location messages added
45	!
46	! 1353 2014-04-08 15:21:23Z heinze
47	! REAL constants provided with KIND-attribute
48	!
49	! 1322 2014-03-20 16:38:49Z raasch
50	! REAL functions provided with KIND-attribute
51	!
52	! 1320 2014-03-20 08:40:49Z raasch
53	! ONLY-attribute added to USE-statements,
54	! kind-parameters added to all INTEGER and REAL declaration statements,
55	! kinds are defined in new module kinds,
56	! revision history before 2012 removed,
57	! comment fields (!:) to be used for variable explanations added to
58	! all variable declaration statements
59	!
60	! 1304 2014-03-12 10:29:42Z raasch
61	! bugfix: single core MPI runs missed some settings of transpose indices
62	!
63	! 1212 2013-08-15 08:46:27Z raasch
64	! error message for poisfft_hybrid removed
65	!
66	! 1159 2013-05-21 11:58:22Z fricke
67	! dirichlet/neumann and neumann/dirichlet removed
68	!
69	! 1139 2013-04-18 07:25:03Z raasch
70	! bugfix for calculating the id of the PE carrying the recycling plane
71	!
72	! 1111 2013-03-08 23:54:10Z raasch
73	! initialization of poisfft moved to module poisfft
74	!
75	! 1092 2013-02-02 11:24:22Z raasch
76	! unused variables removed
77	!
78	! 1056 2012-11-16 15:28:04Z raasch
79	! Indices for arrays n.._mg start from zero due to definition of arrays f2 and
80	! p2 as automatic arrays in recursive subroutine next_mg_level
81	!
82	! 1041 2012-11-06 02:36:29Z raasch
83	! a 2d virtual processor topology is used by default for all machines
84	!
85	! 1036 2012-10-22 13:43:42Z raasch
86	! code put under GPL (PALM 3.9)
87	!
88	! 1003 2012-09-14 14:35:53Z raasch
89	! subdomains must have identical size (grid matching = "match" removed)
90	!
91	! 1001 2012-09-13 14:08:46Z raasch
92	! all actions concerning upstream-spline-method removed
93	!
94	! 978 2012-08-09 08:28:32Z fricke
95	! dirichlet/neumann and neumann/dirichlet added
96	! nxlu and nysv are also calculated for inflow boundary
97	!
98	! 809 2012-01-30 13:32:58Z maronga
99	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
100	!
101	! 807 2012-01-25 11:53:51Z maronga
102	! New cpp directive "__check" implemented which is used by check_namelist_files
103	!
104	! Revision 1.1 1997/07/24 11:15:09 raasch
105	! Initial revision
106	!
107	!
108	! Description:
109	! ------------
110	! Determination of the virtual processor topology (if not prescribed by the
111	! user)and computation of the grid point number and array bounds of the local
112	! domains.
113	!------------------------------------------------------------------------------!
114
115	USE control_parameters, &
116	ONLY: bc_lr, bc_ns, coupling_mode, coupling_mode_remote, &
117	coupling_topology, dt_dosp, gathered_size, grid_level, &
118	grid_level_count, host, inflow_l, inflow_n, inflow_r, inflow_s, &
119	io_blocks, io_group, maximum_grid_level, &
120	maximum_parallel_io_streams, message_string, &
121	mg_switch_to_pe0_level, momentum_advec, neutral, psolver, &
122	outflow_l, outflow_n, outflow_r, outflow_s, recycling_width, &
123	scalar_advec, subdomain_size
124
125	USE grid_variables, &
126	ONLY: dx
127
128	USE indices, &
129	ONLY: mg_loc_ind, nbgp, nnx, nny, nnz, nx, nx_a, nx_o, nxl, nxl_mg, &
130	nxlu, nxr, nxr_mg, ny, ny_a, ny_o, nyn, nyn_mg, nys, nys_mg, &
131	nysv, nz, nzb, nzt, nzt_mg, wall_flags_1, wall_flags_2, &
132	wall_flags_3, wall_flags_4, wall_flags_5, wall_flags_6, &
133	wall_flags_7, wall_flags_8, wall_flags_9, wall_flags_10
134
135	USE kinds
136
137	USE pegrid
138
139	USE transpose_indices, &
140	ONLY: nxl_y, nxl_yd, nxl_z, nxr_y, nxr_yd, nxr_z, nyn_x, nyn_z, nys_x,&
141	nys_z, nzb_x, nzb_y, nzb_yd, nzt_x, nzt_yd, nzt_y
142
143	IMPLICIT NONE
144
145	INTEGER(iwp) :: i !:
146	INTEGER(iwp) :: id_inflow_l !:
147	INTEGER(iwp) :: id_recycling_l !:
148	INTEGER(iwp) :: ind(5) !:
149	INTEGER(iwp) :: j !:
150	INTEGER(iwp) :: k !:
151	INTEGER(iwp) :: maximum_grid_level_l !:
152	INTEGER(iwp) :: mg_levels_x !:
153	INTEGER(iwp) :: mg_levels_y !:
154	INTEGER(iwp) :: mg_levels_z !:
155	INTEGER(iwp) :: mg_switch_to_pe0_level_l !:
156	INTEGER(iwp) :: nnx_y !:
157	INTEGER(iwp) :: nnx_z !:
158	INTEGER(iwp) :: nny_x !:
159	INTEGER(iwp) :: nny_z !:
160	INTEGER(iwp) :: nnz_x !:
161	INTEGER(iwp) :: nnz_y !:
162	INTEGER(iwp) :: numproc_sqr !:
163	INTEGER(iwp) :: nxl_l !:
164	INTEGER(iwp) :: nxr_l !:
165	INTEGER(iwp) :: nyn_l !:
166	INTEGER(iwp) :: nys_l !:
167	INTEGER(iwp) :: nzb_l !:
168	INTEGER(iwp) :: nzt_l !:
169	INTEGER(iwp) :: omp_get_num_threads !:
170
171	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: ind_all !:
172	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxlf !:
173	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxrf !:
174	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nynf !:
175	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nysf !:
176
177	INTEGER(iwp), DIMENSION(2) :: pdims_remote !:
178
179	#if defined( __mpi2 )
180	LOGICAL :: found !:
181	#endif
182
183	!
184	!-- Get the number of OpenMP threads
185	!$OMP PARALLEL
186	#if defined( __intel_openmp_bug )
187	threads_per_task = omp_get_num_threads()
188	#else
189	!$ threads_per_task = omp_get_num_threads()
190	#endif
191	!$OMP END PARALLEL
192
193
194	#if defined( __parallel )
195
196	CALL location_message( 'creating virtual PE grids + MPI derived data types', &
197	.FALSE. )
198	!
199	!-- Determine the processor topology or check it, if prescribed by the user
200	IF ( npex == -1 .AND. npey == -1 ) THEN
201
202	!
203	!-- Automatic determination of the topology
204	numproc_sqr = SQRT( REAL( numprocs, KIND=wp ) )
205	pdims(1) = MAX( numproc_sqr , 1 )
206	DO WHILE ( MOD( numprocs , pdims(1) ) /= 0 )
207	pdims(1) = pdims(1) - 1
208	ENDDO
209	pdims(2) = numprocs / pdims(1)
210
211	ELSEIF ( npex /= -1 .AND. npey /= -1 ) THEN
212
213	!
214	!-- Prescribed by user. Number of processors on the prescribed topology
215	!-- must be equal to the number of PEs available to the job
216	IF ( ( npex * npey ) /= numprocs ) THEN
217	WRITE( message_string, * ) 'number of PEs of the prescribed ', &
218	'topology (', npex*npey,') does not match & the number of ', &
219	'PEs available to the job (', numprocs, ')'
220	CALL message( 'init_pegrid', 'PA0221', 1, 2, 0, 6, 0 )
221	ENDIF
222	pdims(1) = npex
223	pdims(2) = npey
224
225	ELSE
226	!
227	!-- If the processor topology is prescribed by the user, the number of
228	!-- PEs must be given in both directions
229	message_string = 'if the processor topology is prescribed by the, ' // &
230	' user& both values of "npex" and "npey" must be given ' // &
231	'in the &NAMELIST-parameter file'
232	CALL message( 'init_pegrid', 'PA0222', 1, 2, 0, 6, 0 )
233
234	ENDIF
235
236	!
237	!-- For communication speedup, set barriers in front of collective
238	!-- communications by default on SGI-type systems
239	IF ( host(3:5) == 'sgi' ) collective_wait = .TRUE.
240
241	!
242	!-- If necessary, set horizontal boundary conditions to non-cyclic
243	IF ( bc_lr /= 'cyclic' ) cyclic(1) = .FALSE.
244	IF ( bc_ns /= 'cyclic' ) cyclic(2) = .FALSE.
245
246
247	#if ! defined( __check)
248	!
249	!-- Create the virtual processor grid
250	CALL MPI_CART_CREATE( comm_palm, ndim, pdims, cyclic, reorder, &
251	comm2d, ierr )
252	CALL MPI_COMM_RANK( comm2d, myid, ierr )
253	WRITE (myid_char,'(''_'',I6.6)') myid
254
255	CALL MPI_CART_COORDS( comm2d, myid, ndim, pcoord, ierr )
256	CALL MPI_CART_SHIFT( comm2d, 0, 1, pleft, pright, ierr )
257	CALL MPI_CART_SHIFT( comm2d, 1, 1, psouth, pnorth, ierr )
258
259	!
260	!-- Determine sub-topologies for transpositions
261	!-- Transposition from z to x:
262	remain_dims(1) = .TRUE.
263	remain_dims(2) = .FALSE.
264	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dx, ierr )
265	CALL MPI_COMM_RANK( comm1dx, myidx, ierr )
266	!
267	!-- Transposition from x to y
268	remain_dims(1) = .FALSE.
269	remain_dims(2) = .TRUE.
270	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dy, ierr )
271	CALL MPI_COMM_RANK( comm1dy, myidy, ierr )
272
273	#endif
274
275	!
276	!-- Calculate array bounds along x-direction for every PE.
277	ALLOCATE( nxlf(0:pdims(1)-1), nxrf(0:pdims(1)-1), nynf(0:pdims(2)-1), &
278	nysf(0:pdims(2)-1) )
279
280	IF ( MOD( nx+1 , pdims(1) ) /= 0 ) THEN
281	WRITE( message_string, * ) 'x-direction: gridpoint number (',nx+1,') ',&
282	'is not an& integral divisor of the number ', &
283	'processors (', pdims(1),')'
284	CALL message( 'init_pegrid', 'PA0225', 1, 2, 0, 6, 0 )
285	ELSE
286	nnx = ( nx + 1 ) / pdims(1)
287	IF ( nnx*pdims(1) - ( nx + 1) > nnx ) THEN
288	WRITE( message_string, * ) 'x-direction: nx does not match the', &
289	'requirements given by the number of PEs &used', &
290	'& please use nx = ', nx - ( pdims(1) - ( nnx*pdims(1) &
291	- ( nx + 1 ) ) ), ' instead of nx =', nx
292	CALL message( 'init_pegrid', 'PA0226', 1, 2, 0, 6, 0 )
293	ENDIF
294	ENDIF
295
296	!
297	!-- Left and right array bounds, number of gridpoints
298	DO i = 0, pdims(1)-1
299	nxlf(i) = i * nnx
300	nxrf(i) = ( i + 1 ) * nnx - 1
301	ENDDO
302
303	!
304	!-- Calculate array bounds in y-direction for every PE.
305	IF ( MOD( ny+1 , pdims(2) ) /= 0 ) THEN
306	WRITE( message_string, * ) 'y-direction: gridpoint number (',ny+1,') ', &
307	'is not an& integral divisor of the number of', &
308	'processors (', pdims(2),')'
309	CALL message( 'init_pegrid', 'PA0227', 1, 2, 0, 6, 0 )
310	ELSE
311	nny = ( ny + 1 ) / pdims(2)
312	IF ( nny*pdims(2) - ( ny + 1) > nny ) THEN
313	WRITE( message_string, * ) 'y-direction: ny does not match the', &
314	'requirements given by the number of PEs &used ', &
315	'& please use ny = ', ny - ( pdims(2) - ( nnx*pdims(2) &
316	- ( ny + 1 ) ) ), ' instead of ny =', ny
317	CALL message( 'init_pegrid', 'PA0228', 1, 2, 0, 6, 0 )
318	ENDIF
319	ENDIF
320
321	!
322	!-- South and north array bounds
323	DO j = 0, pdims(2)-1
324	nysf(j) = j * nny
325	nynf(j) = ( j + 1 ) * nny - 1
326	ENDDO
327
328	!
329	!-- Local array bounds of the respective PEs
330	nxl = nxlf(pcoord(1))
331	nxr = nxrf(pcoord(1))
332	nys = nysf(pcoord(2))
333	nyn = nynf(pcoord(2))
334	nzb = 0
335	nzt = nz
336	nnz = nz
337
338	!
339	!-- Set switches to define if the PE is situated at the border of the virtual
340	!-- processor grid
341	IF ( nxl == 0 ) left_border_pe = .TRUE.
342	IF ( nxr == nx ) right_border_pe = .TRUE.
343	IF ( nys == 0 ) south_border_pe = .TRUE.
344	IF ( nyn == ny ) north_border_pe = .TRUE.
345
346	!
347	!-- Calculate array bounds and gridpoint numbers for the transposed arrays
348	!-- (needed in the pressure solver)
349	!-- For the transposed arrays, cyclic boundaries as well as top and bottom
350	!-- boundaries are omitted, because they are obstructive to the transposition
351
352	!
353	!-- 1. transposition z --> x
354	!-- This transposition is not neccessary in case of a 1d-decomposition along x
355	nys_x = nys
356	nyn_x = nyn
357	nny_x = nny
358	nnz_x = nz / pdims(1)
359	nzb_x = 1 + myidx * nnz_x
360	nzt_x = ( myidx + 1 ) * nnz_x
361	sendrecvcount_zx = nnx * nny * nnz_x
362
363	IF ( pdims(2) /= 1 ) THEN
364	IF ( MOD( nz , pdims(1) ) /= 0 ) THEN
365	WRITE( message_string, * ) 'transposition z --> x:', &
366	'&nz=',nz,' is not an integral divisior of pdims(1)=', &
367	pdims(1)
368	CALL message( 'init_pegrid', 'PA0230', 1, 2, 0, 6, 0 )
369	ENDIF
370	ENDIF
371
372	!
373	!-- 2. transposition x --> y
374	nnz_y = nnz_x
375	nzb_y = nzb_x
376	nzt_y = nzt_x
377	IF ( MOD( nx+1 , pdims(2) ) /= 0 ) THEN
378	WRITE( message_string, * ) 'transposition x --> y:', &
379	'&nx+1=',nx+1,' is not an integral divisor of ',&
380	'pdims(2)=',pdims(2)
381	CALL message( 'init_pegrid', 'PA0231', 1, 2, 0, 6, 0 )
382	ENDIF
383	nnx_y = (nx+1) / pdims(2)
384	nxl_y = myidy * nnx_y
385	nxr_y = ( myidy + 1 ) * nnx_y - 1
386	sendrecvcount_xy = nnx_y * nny_x * nnz_y
387
388	!
389	!-- 3. transposition y --> z (ELSE: x --> y in case of 1D-decomposition
390	!-- along x)
391	nnx_z = nnx_y
392	nxl_z = nxl_y
393	nxr_z = nxr_y
394	nny_z = (ny+1) / pdims(1)
395	nys_z = myidx * nny_z
396	nyn_z = ( myidx + 1 ) * nny_z - 1
397	sendrecvcount_yz = nnx_y * nny_z * nnz_y
398
399	IF ( pdims(2) /= 1 ) THEN
400	!
401	!-- y --> z
402	!-- This transposition is not neccessary in case of a 1d-decomposition
403	!-- along x, except that the uptream-spline method is switched on
404	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
405	WRITE( message_string, * ) 'transposition y --> z:', &
406	'& ny+1=',ny+1,' is not an integral divisor of ',&
407	'pdims(1)=',pdims(1)
408	CALL message( 'init_pegrid', 'PA0232', 1, 2, 0, 6, 0 )
409	ENDIF
410
411	ELSE
412	!
413	!-- x --> y. This condition must be fulfilled for a 1D-decomposition along x
414	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
415	WRITE( message_string, * ) 'transposition x --> y:', &
416	'& ny+1=',ny+1,' is not an integral divisor of ',&
417	'pdims(1)=',pdims(1)
418	CALL message( 'init_pegrid', 'PA0233', 1, 2, 0, 6, 0 )
419	ENDIF
420
421	ENDIF
422
423	!
424	!-- Indices for direct transpositions z --> y (used for calculating spectra)
425	IF ( dt_dosp /= 9999999.9_wp ) THEN
426	IF ( MOD( nz, pdims(2) ) /= 0 ) THEN
427	WRITE( message_string, * ) 'direct transposition z --> y (needed ', &
428	'for spectra):& nz=',nz,' is not an integral divisor of ',&
429	'pdims(2)=',pdims(2)
430	CALL message( 'init_pegrid', 'PA0234', 1, 2, 0, 6, 0 )
431	ELSE
432	nxl_yd = nxl
433	nxr_yd = nxr
434	nzb_yd = 1 + myidy * ( nz / pdims(2) )
435	nzt_yd = ( myidy + 1 ) * ( nz / pdims(2) )
436	sendrecvcount_zyd = nnx * nny * ( nz / pdims(2) )
437	ENDIF
438	ENDIF
439
440	!
441	!-- Indices for direct transpositions y --> x (they are only possible in case
442	!-- of a 1d-decomposition along x)
443	IF ( pdims(2) == 1 ) THEN
444	nny_x = nny / pdims(1)
445	nys_x = myid * nny_x
446	nyn_x = ( myid + 1 ) * nny_x - 1
447	nzb_x = 1
448	nzt_x = nz
449	sendrecvcount_xy = nnx * nny_x * nz
450	ENDIF
451
452	!
453	!-- Indices for direct transpositions x --> y (they are only possible in case
454	!-- of a 1d-decomposition along y)
455	IF ( pdims(1) == 1 ) THEN
456	nnx_y = nnx / pdims(2)
457	nxl_y = myid * nnx_y
458	nxr_y = ( myid + 1 ) * nnx_y - 1
459	nzb_y = 1
460	nzt_y = nz
461	sendrecvcount_xy = nnx_y * nny * nz
462	ENDIF
463
464	!
465	!-- Arrays for storing the array bounds are needed any more
466	DEALLOCATE( nxlf , nxrf , nynf , nysf )
467
468
469	#if ! defined( __check)
470	!
471	!-- Collect index bounds from other PEs (to be written to restart file later)
472	ALLOCATE( hor_index_bounds(4,0:numprocs-1) )
473
474	IF ( myid == 0 ) THEN
475
476	hor_index_bounds(1,0) = nxl
477	hor_index_bounds(2,0) = nxr
478	hor_index_bounds(3,0) = nys
479	hor_index_bounds(4,0) = nyn
480
481	!
482	!-- Receive data from all other PEs
483	DO i = 1, numprocs-1
484	CALL MPI_RECV( ibuf, 4, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
485	ierr )
486	hor_index_bounds(:,i) = ibuf(1:4)
487	ENDDO
488
489	ELSE
490	!
491	!-- Send index bounds to PE0
492	ibuf(1) = nxl
493	ibuf(2) = nxr
494	ibuf(3) = nys
495	ibuf(4) = nyn
496	CALL MPI_SEND( ibuf, 4, MPI_INTEGER, 0, myid, comm2d, ierr )
497
498	ENDIF
499
500	#endif
501
502	#if defined( __print )
503	!
504	!-- Control output
505	IF ( myid == 0 ) THEN
506	PRINT, ' processor topology *'
507	PRINT*, ' '
508	PRINT*, 'myid pcoord left right south north idx idy nxl: nxr',&
509	&' nys: nyn'
510	PRINT*, '------------------------------------------------------------',&
511	&'-----------'
512	WRITE (*,1000) 0, pcoord(1), pcoord(2), pleft, pright, psouth, pnorth, &
513	myidx, myidy, nxl, nxr, nys, nyn
514	1000 FORMAT (I4,2X,'(',I3,',',I3,')',3X,I4,2X,I4,3X,I4,2X,I4,2X,I3,1X,I3, &
515	2(2X,I4,':',I4))
516
517	!
518	!-- Receive data from the other PEs
519	DO i = 1,numprocs-1
520	CALL MPI_RECV( ibuf, 12, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
521	ierr )
522	WRITE (*,1000) i, ( ibuf(j) , j = 1,12 )
523	ENDDO
524	ELSE
525
526	!
527	!-- Send data to PE0
528	ibuf(1) = pcoord(1); ibuf(2) = pcoord(2); ibuf(3) = pleft
529	ibuf(4) = pright; ibuf(5) = psouth; ibuf(6) = pnorth; ibuf(7) = myidx
530	ibuf(8) = myidy; ibuf(9) = nxl; ibuf(10) = nxr; ibuf(11) = nys
531	ibuf(12) = nyn
532	CALL MPI_SEND( ibuf, 12, MPI_INTEGER, 0, myid, comm2d, ierr )
533	ENDIF
534	#endif
535
536	#if defined( __parallel ) && ! defined( __check)
537	#if defined( __mpi2 )
538	!
539	!-- In case of coupled runs, get the port name on PE0 of the atmosphere model
540	!-- and pass it to PE0 of the ocean model
541	IF ( myid == 0 ) THEN
542
543	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
544
545	CALL MPI_OPEN_PORT( MPI_INFO_NULL, port_name, ierr )
546
547	CALL MPI_PUBLISH_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, &
548	ierr )
549
550	!
551	!-- Write a flag file for the ocean model and the other atmosphere
552	!-- processes.
553	!-- There seems to be a bug in MPICH2 which causes hanging processes
554	!-- in case that execution of LOOKUP_NAME is continued too early
555	!-- (i.e. before the port has been created)
556	OPEN( 90, FILE='COUPLING_PORT_OPENED', FORM='FORMATTED' )
557	WRITE ( 90, '(''TRUE'')' )
558	CLOSE ( 90 )
559
560	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
561
562	!
563	!-- Continue only if the atmosphere model has created the port.
564	!-- There seems to be a bug in MPICH2 which causes hanging processes
565	!-- in case that execution of LOOKUP_NAME is continued too early
566	!-- (i.e. before the port has been created)
567	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
568	DO WHILE ( .NOT. found )
569	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
570	ENDDO
571
572	CALL MPI_LOOKUP_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, ierr )
573
574	ENDIF
575
576	ENDIF
577
578	!
579	!-- In case of coupled runs, establish the connection between the atmosphere
580	!-- and the ocean model and define the intercommunicator (comm_inter)
581	CALL MPI_BARRIER( comm2d, ierr )
582	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
583
584	CALL MPI_COMM_ACCEPT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
585	comm_inter, ierr )
586	coupling_mode_remote = 'ocean_to_atmosphere'
587
588	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
589
590	CALL MPI_COMM_CONNECT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
591	comm_inter, ierr )
592	coupling_mode_remote = 'atmosphere_to_ocean'
593
594	ENDIF
595	#endif
596
597	!
598	!-- Determine the number of ghost point layers
599	IF ( ( scalar_advec == 'ws-scheme' .AND. .NOT. neutral ) .OR. &
600	scalar_advec == 'ws-scheme-mono' .OR. &
601	momentum_advec == 'ws-scheme' ) THEN
602	nbgp = 3
603	ELSE
604	nbgp = 1
605	ENDIF
606
607	!
608	!-- Create a new MPI derived datatype for the exchange of surface (xy) data,
609	!-- which is needed for coupled atmosphere-ocean runs.
610	!-- First, calculate number of grid points of an xy-plane.
611	ngp_xy = ( nxr - nxl + 1 + 2 * nbgp ) * ( nyn - nys + 1 + 2 * nbgp )
612	CALL MPI_TYPE_VECTOR( ngp_xy, 1, nzt-nzb+2, MPI_REAL, type_xy, ierr )
613	CALL MPI_TYPE_COMMIT( type_xy, ierr )
614
615	IF ( TRIM( coupling_mode ) /= 'uncoupled' ) THEN
616
617	!
618	!-- Pass the number of grid points of the atmosphere model to
619	!-- the ocean model and vice versa
620	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
621
622	nx_a = nx
623	ny_a = ny
624
625	IF ( myid == 0 ) THEN
626
627	CALL MPI_SEND( nx_a, 1, MPI_INTEGER, numprocs, 1, comm_inter, &
628	ierr )
629	CALL MPI_SEND( ny_a, 1, MPI_INTEGER, numprocs, 2, comm_inter, &
630	ierr )
631	CALL MPI_SEND( pdims, 2, MPI_INTEGER, numprocs, 3, comm_inter, &
632	ierr )
633	CALL MPI_RECV( nx_o, 1, MPI_INTEGER, numprocs, 4, comm_inter, &
634	status, ierr )
635	CALL MPI_RECV( ny_o, 1, MPI_INTEGER, numprocs, 5, comm_inter, &
636	status, ierr )
637	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, numprocs, 6, &
638	comm_inter, status, ierr )
639	ENDIF
640
641	CALL MPI_BCAST( nx_o, 1, MPI_INTEGER, 0, comm2d, ierr )
642	CALL MPI_BCAST( ny_o, 1, MPI_INTEGER, 0, comm2d, ierr )
643	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr )
644
645	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
646
647	nx_o = nx
648	ny_o = ny
649
650	IF ( myid == 0 ) THEN
651
652	CALL MPI_RECV( nx_a, 1, MPI_INTEGER, 0, 1, comm_inter, status, &
653	ierr )
654	CALL MPI_RECV( ny_a, 1, MPI_INTEGER, 0, 2, comm_inter, status, &
655	ierr )
656	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, 0, 3, comm_inter, &
657	status, ierr )
658	CALL MPI_SEND( nx_o, 1, MPI_INTEGER, 0, 4, comm_inter, ierr )
659	CALL MPI_SEND( ny_o, 1, MPI_INTEGER, 0, 5, comm_inter, ierr )
660	CALL MPI_SEND( pdims, 2, MPI_INTEGER, 0, 6, comm_inter, ierr )
661	ENDIF
662
663	CALL MPI_BCAST( nx_a, 1, MPI_INTEGER, 0, comm2d, ierr)
664	CALL MPI_BCAST( ny_a, 1, MPI_INTEGER, 0, comm2d, ierr)
665	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr)
666
667	ENDIF
668
669	ngp_a = ( nx_a+1 + 2 * nbgp ) * ( ny_a+1 + 2 * nbgp )
670	ngp_o = ( nx_o+1 + 2 * nbgp ) * ( ny_o+1 + 2 * nbgp )
671
672	!
673	!-- Determine if the horizontal grid and the number of PEs in ocean and
674	!-- atmosphere is same or not
675	IF ( nx_o == nx_a .AND. ny_o == ny_a .AND. &
676	pdims(1) == pdims_remote(1) .AND. pdims(2) == pdims_remote(2) ) &
677	THEN
678	coupling_topology = 0
679	ELSE
680	coupling_topology = 1
681	ENDIF
682
683	!
684	!-- Determine the target PEs for the exchange between ocean and
685	!-- atmosphere (comm2d)
686	IF ( coupling_topology == 0 ) THEN
687	!
688	!-- In case of identical topologies, every atmosphere PE has exactly one
689	!-- ocean PE counterpart and vice versa
690	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
691	target_id = myid + numprocs
692	ELSE
693	target_id = myid
694	ENDIF
695
696	ELSE
697	!
698	!-- In case of nonequivalent topology in ocean and atmosphere only for
699	!-- PE0 in ocean and PE0 in atmosphere a target_id is needed, since
700	!-- data echxchange between ocean and atmosphere will be done only
701	!-- between these PEs.
702	IF ( myid == 0 ) THEN
703
704	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
705	target_id = numprocs
706	ELSE
707	target_id = 0
708	ENDIF
709
710	ENDIF
711
712	ENDIF
713
714	ENDIF
715
716
717	#endif
718
719	#else
720
721	!
722	!-- Array bounds when running on a single PE (respectively a non-parallel
723	!-- machine)
724	nxl = 0
725	nxr = nx
726	nnx = nxr - nxl + 1
727	nys = 0
728	nyn = ny
729	nny = nyn - nys + 1
730	nzb = 0
731	nzt = nz
732	nnz = nz
733
734	ALLOCATE( hor_index_bounds(4,0:0) )
735	hor_index_bounds(1,0) = nxl
736	hor_index_bounds(2,0) = nxr
737	hor_index_bounds(3,0) = nys
738	hor_index_bounds(4,0) = nyn
739
740	!
741	!-- Array bounds for the pressure solver (in the parallel code, these bounds
742	!-- are the ones for the transposed arrays)
743	nys_x = nys
744	nyn_x = nyn
745	nzb_x = nzb + 1
746	nzt_x = nzt
747
748	nxl_y = nxl
749	nxr_y = nxr
750	nzb_y = nzb + 1
751	nzt_y = nzt
752
753	nxl_z = nxl
754	nxr_z = nxr
755	nys_z = nys
756	nyn_z = nyn
757
758	#endif
759
760	!
761	!-- Calculate number of grid levels necessary for the multigrid poisson solver
762	!-- as well as the gridpoint indices on each level
763	IF ( psolver == 'multigrid' ) THEN
764
765	!
766	!-- First calculate number of possible grid levels for the subdomains
767	mg_levels_x = 1
768	mg_levels_y = 1
769	mg_levels_z = 1
770
771	i = nnx
772	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
773	i = i / 2
774	mg_levels_x = mg_levels_x + 1
775	ENDDO
776
777	j = nny
778	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
779	j = j / 2
780	mg_levels_y = mg_levels_y + 1
781	ENDDO
782
783	k = nz ! do not use nnz because it might be > nz due to transposition
784	! requirements
785	DO WHILE ( MOD( k, 2 ) == 0 .AND. k /= 2 )
786	k = k / 2
787	mg_levels_z = mg_levels_z + 1
788	ENDDO
789
790	maximum_grid_level = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
791
792	!
793	!-- Find out, if the total domain allows more levels. These additional
794	!-- levels are identically processed on all PEs.
795	IF ( numprocs > 1 .AND. mg_switch_to_pe0_level /= -1 ) THEN
796
797	IF ( mg_levels_z > MIN( mg_levels_x, mg_levels_y ) ) THEN
798
799	mg_switch_to_pe0_level_l = maximum_grid_level
800
801	mg_levels_x = 1
802	mg_levels_y = 1
803
804	i = nx+1
805	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
806	i = i / 2
807	mg_levels_x = mg_levels_x + 1
808	ENDDO
809
810	j = ny+1
811	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
812	j = j / 2
813	mg_levels_y = mg_levels_y + 1
814	ENDDO
815
816	maximum_grid_level_l = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
817
818	IF ( maximum_grid_level_l > mg_switch_to_pe0_level_l ) THEN
819	mg_switch_to_pe0_level_l = maximum_grid_level_l - &
820	mg_switch_to_pe0_level_l + 1
821	ELSE
822	mg_switch_to_pe0_level_l = 0
823	ENDIF
824
825	ELSE
826	mg_switch_to_pe0_level_l = 0
827	maximum_grid_level_l = maximum_grid_level
828
829	ENDIF
830
831	!
832	!-- Use switch level calculated above only if it is not pre-defined
833	!-- by user
834	IF ( mg_switch_to_pe0_level == 0 ) THEN
835	IF ( mg_switch_to_pe0_level_l /= 0 ) THEN
836	mg_switch_to_pe0_level = mg_switch_to_pe0_level_l
837	maximum_grid_level = maximum_grid_level_l
838	ENDIF
839
840	ELSE
841	!
842	!-- Check pre-defined value and reset to default, if neccessary
843	IF ( mg_switch_to_pe0_level < mg_switch_to_pe0_level_l .OR. &
844	mg_switch_to_pe0_level >= maximum_grid_level_l ) THEN
845	message_string = 'mg_switch_to_pe0_level ' // &
846	'out of range and reset to default (=0)'
847	CALL message( 'init_pegrid', 'PA0235', 0, 1, 0, 6, 0 )
848	mg_switch_to_pe0_level = 0
849	ELSE
850	!
851	!-- Use the largest number of possible levels anyway and recalculate
852	!-- the switch level to this largest number of possible values
853	maximum_grid_level = maximum_grid_level_l
854
855	ENDIF
856
857	ENDIF
858
859	ENDIF
860
861	ALLOCATE( grid_level_count(maximum_grid_level), &
862	nxl_mg(0:maximum_grid_level), nxr_mg(0:maximum_grid_level), &
863	nyn_mg(0:maximum_grid_level), nys_mg(0:maximum_grid_level), &
864	nzt_mg(0:maximum_grid_level) )
865
866	grid_level_count = 0
867	!
868	!-- Index zero required as dummy due to definition of arrays f2 and p2 in
869	!-- recursive subroutine next_mg_level
870	nxl_mg(0) = 0; nxr_mg(0) = 0; nyn_mg(0) = 0; nys_mg(0) = 0; nzt_mg(0) = 0
871
872	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzt_l = nzt
873
874	DO i = maximum_grid_level, 1 , -1
875
876	IF ( i == mg_switch_to_pe0_level ) THEN
877	#if defined( __parallel ) && ! defined( __check )
878	!
879	!-- Save the grid size of the subdomain at the switch level, because
880	!-- it is needed in poismg.
881	ind(1) = nxl_l; ind(2) = nxr_l
882	ind(3) = nys_l; ind(4) = nyn_l
883	ind(5) = nzt_l
884	ALLOCATE( ind_all(5*numprocs), mg_loc_ind(5,0:numprocs-1) )
885	CALL MPI_ALLGATHER( ind, 5, MPI_INTEGER, ind_all, 5, &
886	MPI_INTEGER, comm2d, ierr )
887	DO j = 0, numprocs-1
888	DO k = 1, 5
889	mg_loc_ind(k,j) = ind_all(k+j*5)
890	ENDDO
891	ENDDO
892	DEALLOCATE( ind_all )
893	!
894	!-- Calculate the grid size of the total domain
895	nxr_l = ( nxr_l-nxl_l+1 ) * pdims(1) - 1
896	nxl_l = 0
897	nyn_l = ( nyn_l-nys_l+1 ) * pdims(2) - 1
898	nys_l = 0
899	!
900	!-- The size of this gathered array must not be larger than the
901	!-- array tend, which is used in the multigrid scheme as a temporary
902	!-- array. Therefore the subdomain size of an PE is calculated and
903	!-- the size of the gathered grid. These values are used in
904	!-- routines pres and poismg
905	subdomain_size = ( nxr - nxl + 2 * nbgp + 1 ) * &
906	( nyn - nys + 2 * nbgp + 1 ) * ( nzt - nzb + 2 )
907	gathered_size = ( nxr_l - nxl_l + 3 ) * ( nyn_l - nys_l + 3 ) * &
908	( nzt_l - nzb + 2 )
909
910	#elif ! defined ( __parallel )
911	message_string = 'multigrid gather/scatter impossible ' // &
912	'in non parallel mode'
913	CALL message( 'init_pegrid', 'PA0237', 1, 2, 0, 6, 0 )
914	#endif
915	ENDIF
916
917	nxl_mg(i) = nxl_l
918	nxr_mg(i) = nxr_l
919	nys_mg(i) = nys_l
920	nyn_mg(i) = nyn_l
921	nzt_mg(i) = nzt_l
922
923	nxl_l = nxl_l / 2
924	nxr_l = nxr_l / 2
925	nys_l = nys_l / 2
926	nyn_l = nyn_l / 2
927	nzt_l = nzt_l / 2
928
929	ENDDO
930
931	!
932	!-- Temporary problem: Currently calculation of maxerror iin routine poismg crashes
933	!-- if grid data are collected on PE0 already on the finest grid level.
934	!-- To be solved later.
935	IF ( maximum_grid_level == mg_switch_to_pe0_level ) THEN
936	message_string = 'grid coarsening on subdomain level cannot be performed'
937	CALL message( 'poismg', 'PA0236', 1, 2, 0, 6, 0 )
938	ENDIF
939
940	ELSE
941
942	maximum_grid_level = 0
943
944	ENDIF
945
946	!
947	!-- Default level 0 tells exchange_horiz that all ghost planes have to be
948	!-- exchanged. grid_level is adjusted in poismg, where only one ghost plane
949	!-- is required.
950	grid_level = 0
951
952	#if defined( __parallel ) && ! defined ( __check )
953	!
954	!-- Gridpoint number for the exchange of ghost points (y-line for 2D-arrays)
955	ngp_y = nyn - nys + 1 + 2 * nbgp
956
957	!
958	!-- Define new MPI derived datatypes for the exchange of ghost points in
959	!-- x- and y-direction for 2D-arrays (line)
960	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_REAL, type_x, &
961	ierr )
962	CALL MPI_TYPE_COMMIT( type_x, ierr )
963	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_INTEGER, &
964	type_x_int, ierr )
965	CALL MPI_TYPE_COMMIT( type_x_int, ierr )
966
967	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_REAL, type_y, ierr )
968	CALL MPI_TYPE_COMMIT( type_y, ierr )
969	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_INTEGER, type_y_int, ierr )
970	CALL MPI_TYPE_COMMIT( type_y_int, ierr )
971
972
973	!
974	!-- Calculate gridpoint numbers for the exchange of ghost points along x
975	!-- (yz-plane for 3D-arrays) and define MPI derived data type(s) for the
976	!-- exchange of ghost points in y-direction (xz-plane).
977	!-- Do these calculations for the model grid and (if necessary) also
978	!-- for the coarser grid levels used in the multigrid method
979	ALLOCATE ( ngp_yz(0:maximum_grid_level), type_xz(0:maximum_grid_level),&
980	type_yz(0:maximum_grid_level) )
981
982	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzb_l = nzb; nzt_l = nzt
983
984	!
985	!-- Discern between the model grid, which needs nbgp ghost points and
986	!-- grid levels for the multigrid scheme. In the latter case only one
987	!-- ghost point is necessary.
988	!-- First definition of MPI-datatypes for exchange of ghost layers on normal
989	!-- grid. The following loop is needed for data exchange in poismg.f90.
990	!
991	!-- Determine number of grid points of yz-layer for exchange
992	ngp_yz(0) = (nzt - nzb + 2) * (nyn - nys + 1 + 2 * nbgp)
993
994	!
995	!-- Define an MPI-datatype for the exchange of left/right boundaries.
996	!-- Although data are contiguous in physical memory (which does not
997	!-- necessarily require an MPI-derived datatype), the data exchange between
998	!-- left and right PE's using the MPI-derived type is 10% faster than without.
999	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2nbgp, nbgp(nzt-nzb+2), ngp_yz(0), &
1000	MPI_REAL, type_xz(0), ierr )
1001	CALL MPI_TYPE_COMMIT( type_xz(0), ierr )
1002
1003	CALL MPI_TYPE_VECTOR( nbgp, ngp_yz(0), ngp_yz(0), MPI_REAL, type_yz(0), &
1004	ierr )
1005	CALL MPI_TYPE_COMMIT( type_yz(0), ierr )
1006
1007	!
1008	!-- Definition of MPI-datatypes for multigrid method (coarser level grids)
1009	IF ( psolver == 'multigrid' ) THEN
1010	!
1011	!-- Definition of MPI-datatyoe as above, but only 1 ghost level is used
1012	DO i = maximum_grid_level, 1 , -1
1013
1014	ngp_yz(i) = (nzt_l - nzb_l + 2) * (nyn_l - nys_l + 3)
1015
1016	CALL MPI_TYPE_VECTOR( nxr_l-nxl_l+3, nzt_l-nzb_l+2, ngp_yz(i), &
1017	MPI_REAL, type_xz(i), ierr )
1018	CALL MPI_TYPE_COMMIT( type_xz(i), ierr )
1019
1020	CALL MPI_TYPE_VECTOR( 1, ngp_yz(i), ngp_yz(i), MPI_REAL, type_yz(i), &
1021	ierr )
1022	CALL MPI_TYPE_COMMIT( type_yz(i), ierr )
1023
1024	nxl_l = nxl_l / 2
1025	nxr_l = nxr_l / 2
1026	nys_l = nys_l / 2
1027	nyn_l = nyn_l / 2
1028	nzt_l = nzt_l / 2
1029
1030	ENDDO
1031
1032	ENDIF
1033	#endif
1034
1035	#if defined( __parallel ) && ! defined ( __check )
1036	!
1037	!-- Setting of flags for inflow/outflow conditions in case of non-cyclic
1038	!-- horizontal boundary conditions.
1039	IF ( pleft == MPI_PROC_NULL ) THEN
1040	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1041	inflow_l = .TRUE.
1042	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1043	outflow_l = .TRUE.
1044	ENDIF
1045	ENDIF
1046
1047	IF ( pright == MPI_PROC_NULL ) THEN
1048	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1049	outflow_r = .TRUE.
1050	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1051	inflow_r = .TRUE.
1052	ENDIF
1053	ENDIF
1054
1055	IF ( psouth == MPI_PROC_NULL ) THEN
1056	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1057	outflow_s = .TRUE.
1058	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1059	inflow_s = .TRUE.
1060	ENDIF
1061	ENDIF
1062
1063	IF ( pnorth == MPI_PROC_NULL ) THEN
1064	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1065	inflow_n = .TRUE.
1066	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1067	outflow_n = .TRUE.
1068	ENDIF
1069	ENDIF
1070
1071	!
1072	!-- Broadcast the id of the inflow PE
1073	IF ( inflow_l ) THEN
1074	id_inflow_l = myidx
1075	ELSE
1076	id_inflow_l = 0
1077	ENDIF
1078	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1079	CALL MPI_ALLREDUCE( id_inflow_l, id_inflow, 1, MPI_INTEGER, MPI_SUM, &
1080	comm1dx, ierr )
1081
1082	!
1083	!-- Broadcast the id of the recycling plane
1084	!-- WARNING: needs to be adjusted in case of inflows other than from left side!
1085	IF ( NINT( recycling_width / dx ) >= nxl .AND. &
1086	NINT( recycling_width / dx ) <= nxr ) THEN
1087	id_recycling_l = myidx
1088	ELSE
1089	id_recycling_l = 0
1090	ENDIF
1091	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1092	CALL MPI_ALLREDUCE( id_recycling_l, id_recycling, 1, MPI_INTEGER, MPI_SUM, &
1093	comm1dx, ierr )
1094
1095	CALL location_message( 'finished', .TRUE. )
1096
1097	#elif ! defined ( __parallel )
1098	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1099	inflow_l = .TRUE.
1100	outflow_r = .TRUE.
1101	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1102	outflow_l = .TRUE.
1103	inflow_r = .TRUE.
1104	ENDIF
1105
1106	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1107	inflow_n = .TRUE.
1108	outflow_s = .TRUE.
1109	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1110	outflow_n = .TRUE.
1111	inflow_s = .TRUE.
1112	ENDIF
1113	#endif
1114
1115	!
1116	!-- At the inflow or outflow, u or v, respectively, have to be calculated for
1117	!-- one more grid point.
1118	IF ( inflow_l .OR. outflow_l ) THEN
1119	nxlu = nxl + 1
1120	ELSE
1121	nxlu = nxl
1122	ENDIF
1123	IF ( inflow_s .OR. outflow_s ) THEN
1124	nysv = nys + 1
1125	ELSE
1126	nysv = nys
1127	ENDIF
1128
1129	!
1130	!-- Allocate wall flag arrays used in the multigrid solver
1131	IF ( psolver == 'multigrid' ) THEN
1132
1133	DO i = maximum_grid_level, 1, -1
1134
1135	SELECT CASE ( i )
1136
1137	CASE ( 1 )
1138	ALLOCATE( wall_flags_1(nzb:nzt_mg(i)+1, &
1139	nys_mg(i)-1:nyn_mg(i)+1, &
1140	nxl_mg(i)-1:nxr_mg(i)+1) )
1141
1142	CASE ( 2 )
1143	ALLOCATE( wall_flags_2(nzb:nzt_mg(i)+1, &
1144	nys_mg(i)-1:nyn_mg(i)+1, &
1145	nxl_mg(i)-1:nxr_mg(i)+1) )
1146
1147	CASE ( 3 )
1148	ALLOCATE( wall_flags_3(nzb:nzt_mg(i)+1, &
1149	nys_mg(i)-1:nyn_mg(i)+1, &
1150	nxl_mg(i)-1:nxr_mg(i)+1) )
1151
1152	CASE ( 4 )
1153	ALLOCATE( wall_flags_4(nzb:nzt_mg(i)+1, &
1154	nys_mg(i)-1:nyn_mg(i)+1, &
1155	nxl_mg(i)-1:nxr_mg(i)+1) )
1156
1157	CASE ( 5 )
1158	ALLOCATE( wall_flags_5(nzb:nzt_mg(i)+1, &
1159	nys_mg(i)-1:nyn_mg(i)+1, &
1160	nxl_mg(i)-1:nxr_mg(i)+1) )
1161
1162	CASE ( 6 )
1163	ALLOCATE( wall_flags_6(nzb:nzt_mg(i)+1, &
1164	nys_mg(i)-1:nyn_mg(i)+1, &
1165	nxl_mg(i)-1:nxr_mg(i)+1) )
1166
1167	CASE ( 7 )
1168	ALLOCATE( wall_flags_7(nzb:nzt_mg(i)+1, &
1169	nys_mg(i)-1:nyn_mg(i)+1, &
1170	nxl_mg(i)-1:nxr_mg(i)+1) )
1171
1172	CASE ( 8 )
1173	ALLOCATE( wall_flags_8(nzb:nzt_mg(i)+1, &
1174	nys_mg(i)-1:nyn_mg(i)+1, &
1175	nxl_mg(i)-1:nxr_mg(i)+1) )
1176
1177	CASE ( 9 )
1178	ALLOCATE( wall_flags_9(nzb:nzt_mg(i)+1, &
1179	nys_mg(i)-1:nyn_mg(i)+1, &
1180	nxl_mg(i)-1:nxr_mg(i)+1) )
1181
1182	CASE ( 10 )
1183	ALLOCATE( wall_flags_10(nzb:nzt_mg(i)+1, &
1184	nys_mg(i)-1:nyn_mg(i)+1, &
1185	nxl_mg(i)-1:nxr_mg(i)+1) )
1186
1187	CASE DEFAULT
1188	message_string = 'more than 10 multigrid levels'
1189	CALL message( 'init_pegrid', 'PA0238', 1, 2, 0, 6, 0 )
1190
1191	END SELECT
1192
1193	ENDDO
1194
1195	ENDIF
1196
1197	!
1198	!-- Calculate the number of groups into which parallel I/O is split.
1199	!-- The default for files which are opened by all PEs (or where each
1200	!-- PE opens his own independent file) is, that all PEs are doing input/output
1201	!-- in parallel at the same time. This might cause performance or even more
1202	!-- severe problems depending on the configuration of the underlying file
1203	!-- system.
1204	!-- First, set the default:
1205	IF ( maximum_parallel_io_streams == -1 .OR. &
1206	maximum_parallel_io_streams > numprocs ) THEN
1207	maximum_parallel_io_streams = numprocs
1208	ENDIF
1209
1210	!
1211	!-- Now calculate the number of io_blocks and the io_group to which the
1212	!-- respective PE belongs. I/O of the groups is done in serial, but in parallel
1213	!-- for all PEs belonging to the same group. A preliminary setting with myid
1214	!-- based on MPI_COMM_WORLD has been done in parin.
1215	io_blocks = numprocs / maximum_parallel_io_streams
1216	io_group = MOD( myid+1, io_blocks )
1217
1218
1219	END SUBROUTINE init_pegrid

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