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source: palm/trunk/SOURCE/init_pegrid.f90 @ 1780

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1	!> @file init_pegrid.f90
2	!--------------------------------------------------------------------------------!
3	! This file is part of PALM.
4	!
5	! PALM is free software: you can redistribute it and/or modify it under the terms
6	! of the GNU General Public License as published by the Free Software Foundation,
7	! either version 3 of the License, or (at your option) any later version.
8	!
9	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
10	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
11	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
12	!
13	! You should have received a copy of the GNU General Public License along with
14	! PALM. If not, see <http://www.gnu.org/licenses/>.
15	!
16	! Copyright 1997-2014 Leibniz Universitaet Hannover
17	!--------------------------------------------------------------------------------!
18	!
19	! Current revisions:
20	! ------------------
21	!
22	!
23	! Former revisions:
24	! -----------------
25	! $Id: init_pegrid.f90 1780 2016-03-03 08:39:40Z raasch $
26	!
27	! 1779 2016-03-03 08:01:28Z raasch
28	! changes regarding nested domain removed: virtual PE grid will be automatically
29	! calculated for nested runs too
30	!
31	! 1764 2016-02-28 12:45:19Z raasch
32	! cpp-statements for nesting removed
33	!
34	! 1762 2016-02-25 12:31:13Z hellstea
35	! Introduction of nested domain feature
36	!
37	! 1682 2015-10-07 23:56:08Z knoop
38	! Code annotations made doxygen readable
39	!
40	! 1677 2015-10-02 13:25:23Z boeske
41	! New MPI-data types for exchange of 3D integer arrays.
42	!
43	! 1575 2015-03-27 09:56:27Z raasch
44	! adjustments for psolver-queries, calculation of ngp_xz added
45	!
46	! 1565 2015-03-09 20:59:31Z suehring
47	! Refine if-clause for setting nbgp.
48	!
49	! 1557 2015-03-05 16:43:04Z suehring
50	! Adjustment for monotonic limiter
51	!
52	! 1468 2014-09-24 14:06:57Z maronga
53	! Adapted for use on up to 6-digit processor cores
54	!
55	! 1435 2014-07-21 10:37:02Z keck
56	! bugfix: added missing parameter coupling_mode_remote to ONLY-attribute
57	!
58	! 1402 2014-05-09 14:25:13Z raasch
59	! location messages modified
60	!
61	! 1384 2014-05-02 14:31:06Z raasch
62	! location messages added
63	!
64	! 1353 2014-04-08 15:21:23Z heinze
65	! REAL constants provided with KIND-attribute
66	!
67	! 1322 2014-03-20 16:38:49Z raasch
68	! REAL functions provided with KIND-attribute
69	!
70	! 1320 2014-03-20 08:40:49Z raasch
71	! ONLY-attribute added to USE-statements,
72	! kind-parameters added to all INTEGER and REAL declaration statements,
73	! kinds are defined in new module kinds,
74	! revision history before 2012 removed,
75	! comment fields (!:) to be used for variable explanations added to
76	! all variable declaration statements
77	!
78	! 1304 2014-03-12 10:29:42Z raasch
79	! bugfix: single core MPI runs missed some settings of transpose indices
80	!
81	! 1212 2013-08-15 08:46:27Z raasch
82	! error message for poisfft_hybrid removed
83	!
84	! 1159 2013-05-21 11:58:22Z fricke
85	! dirichlet/neumann and neumann/dirichlet removed
86	!
87	! 1139 2013-04-18 07:25:03Z raasch
88	! bugfix for calculating the id of the PE carrying the recycling plane
89	!
90	! 1111 2013-03-08 23:54:10Z raasch
91	! initialization of poisfft moved to module poisfft
92	!
93	! 1092 2013-02-02 11:24:22Z raasch
94	! unused variables removed
95	!
96	! 1056 2012-11-16 15:28:04Z raasch
97	! Indices for arrays n.._mg start from zero due to definition of arrays f2 and
98	! p2 as automatic arrays in recursive subroutine next_mg_level
99	!
100	! 1041 2012-11-06 02:36:29Z raasch
101	! a 2d virtual processor topology is used by default for all machines
102	!
103	! 1036 2012-10-22 13:43:42Z raasch
104	! code put under GPL (PALM 3.9)
105	!
106	! 1003 2012-09-14 14:35:53Z raasch
107	! subdomains must have identical size (grid matching = "match" removed)
108	!
109	! 1001 2012-09-13 14:08:46Z raasch
110	! all actions concerning upstream-spline-method removed
111	!
112	! 978 2012-08-09 08:28:32Z fricke
113	! dirichlet/neumann and neumann/dirichlet added
114	! nxlu and nysv are also calculated for inflow boundary
115	!
116	! 809 2012-01-30 13:32:58Z maronga
117	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
118	!
119	! 807 2012-01-25 11:53:51Z maronga
120	! New cpp directive "__check" implemented which is used by check_namelist_files
121	!
122	! Revision 1.1 1997/07/24 11:15:09 raasch
123	! Initial revision
124	!
125	!
126	! Description:
127	! ------------
128	!> Determination of the virtual processor topology (if not prescribed by the
129	!> user)and computation of the grid point number and array bounds of the local
130	!> domains.
131	!------------------------------------------------------------------------------!
132	SUBROUTINE init_pegrid
133
134
135	USE control_parameters, &
136	ONLY: bc_lr, bc_ns, coupling_mode, coupling_mode_remote, &
137	coupling_topology, dt_dosp, gathered_size, grid_level, &
138	grid_level_count, host, inflow_l, inflow_n, inflow_r, inflow_s, &
139	io_blocks, io_group, maximum_grid_level, &
140	maximum_parallel_io_streams, message_string, &
141	mg_switch_to_pe0_level, momentum_advec, nest_bound_l, &
142	nest_bound_n, nest_bound_r, nest_bound_s, neutral, psolver, &
143	outflow_l, outflow_n, outflow_r, outflow_s, recycling_width, &
144	scalar_advec, subdomain_size
145
146	USE grid_variables, &
147	ONLY: dx
148
149	USE indices, &
150	ONLY: mg_loc_ind, nbgp, nnx, nny, nnz, nx, nx_a, nx_o, nxl, nxl_mg, &
151	nxlu, nxr, nxr_mg, ny, ny_a, ny_o, nyn, nyn_mg, nys, nys_mg, &
152	nysv, nz, nzb, nzt, nzt_mg, wall_flags_1, wall_flags_2, &
153	wall_flags_3, wall_flags_4, wall_flags_5, wall_flags_6, &
154	wall_flags_7, wall_flags_8, wall_flags_9, wall_flags_10
155
156	USE kinds
157
158	USE pegrid
159
160	USE transpose_indices, &
161	ONLY: nxl_y, nxl_yd, nxl_z, nxr_y, nxr_yd, nxr_z, nyn_x, nyn_z, nys_x,&
162	nys_z, nzb_x, nzb_y, nzb_yd, nzt_x, nzt_yd, nzt_y
163
164	IMPLICIT NONE
165
166	INTEGER(iwp) :: i !<
167	INTEGER(iwp) :: id_inflow_l !<
168	INTEGER(iwp) :: id_recycling_l !<
169	INTEGER(iwp) :: ind(5) !<
170	INTEGER(iwp) :: j !<
171	INTEGER(iwp) :: k !<
172	INTEGER(iwp) :: maximum_grid_level_l !<
173	INTEGER(iwp) :: mg_levels_x !<
174	INTEGER(iwp) :: mg_levels_y !<
175	INTEGER(iwp) :: mg_levels_z !<
176	INTEGER(iwp) :: mg_switch_to_pe0_level_l !<
177	INTEGER(iwp) :: nnx_y !<
178	INTEGER(iwp) :: nnx_z !<
179	INTEGER(iwp) :: nny_x !<
180	INTEGER(iwp) :: nny_z !<
181	INTEGER(iwp) :: nnz_x !<
182	INTEGER(iwp) :: nnz_y !<
183	INTEGER(iwp) :: numproc_sqr !<
184	INTEGER(iwp) :: nxl_l !<
185	INTEGER(iwp) :: nxr_l !<
186	INTEGER(iwp) :: nyn_l !<
187	INTEGER(iwp) :: nys_l !<
188	INTEGER(iwp) :: nzb_l !<
189	INTEGER(iwp) :: nzt_l !<
190	INTEGER(iwp) :: omp_get_num_threads !<
191
192	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: ind_all !<
193	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxlf !<
194	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxrf !<
195	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nynf !<
196	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nysf !<
197
198	INTEGER(iwp), DIMENSION(2) :: pdims_remote !<
199
200	#if defined( __mpi2 )
201	LOGICAL :: found !<
202	#endif
203
204	!
205	!-- Get the number of OpenMP threads
206	!$OMP PARALLEL
207	#if defined( __intel_openmp_bug )
208	threads_per_task = omp_get_num_threads()
209	#else
210	!$ threads_per_task = omp_get_num_threads()
211	#endif
212	!$OMP END PARALLEL
213
214
215	#if defined( __parallel )
216
217	CALL location_message( 'creating virtual PE grids + MPI derived data types', &
218	.FALSE. )
219
220	!
221	!-- Determine the processor topology or check it, if prescribed by the user
222	IF ( npex == -1 .AND. npey == -1 ) THEN
223
224	!
225	!-- Automatic determination of the topology
226	numproc_sqr = SQRT( REAL( numprocs, KIND=wp ) )
227	pdims(1) = MAX( numproc_sqr , 1 )
228	DO WHILE ( MOD( numprocs , pdims(1) ) /= 0 )
229	pdims(1) = pdims(1) - 1
230	ENDDO
231	pdims(2) = numprocs / pdims(1)
232
233	ELSEIF ( npex /= -1 .AND. npey /= -1 ) THEN
234
235	!
236	!-- Prescribed by user. Number of processors on the prescribed topology
237	!-- must be equal to the number of PEs available to the job
238	IF ( ( npex * npey ) /= numprocs ) THEN
239	WRITE( message_string, * ) 'number of PEs of the prescribed ', &
240	'topology (', npex*npey,') does not match & the number of ', &
241	'PEs available to the job (', numprocs, ')'
242	CALL message( 'init_pegrid', 'PA0221', 1, 2, 0, 6, 0 )
243	ENDIF
244	pdims(1) = npex
245	pdims(2) = npey
246
247	ELSE
248	!
249	!-- If the processor topology is prescribed by the user, the number of
250	!-- PEs must be given in both directions
251	message_string = 'if the processor topology is prescribed by th' // &
252	'e user& both values of "npex" and "npey" must be given' // &
253	' in the &NAMELIST-parameter file'
254	CALL message( 'init_pegrid', 'PA0222', 1, 2, 0, 6, 0 )
255
256	ENDIF
257
258	!
259	!-- For communication speedup, set barriers in front of collective
260	!-- communications by default on SGI-type systems
261	IF ( host(3:5) == 'sgi' ) collective_wait = .TRUE.
262
263	!
264	!-- If necessary, set horizontal boundary conditions to non-cyclic
265	IF ( bc_lr /= 'cyclic' ) cyclic(1) = .FALSE.
266	IF ( bc_ns /= 'cyclic' ) cyclic(2) = .FALSE.
267
268
269	#if ! defined( __check)
270	!
271	!-- Create the virtual processor grid
272	CALL MPI_CART_CREATE( comm_palm, ndim, pdims, cyclic, reorder, &
273	comm2d, ierr )
274	CALL MPI_COMM_RANK( comm2d, myid, ierr )
275	WRITE (myid_char,'(''_'',I6.6)') myid
276
277	CALL MPI_CART_COORDS( comm2d, myid, ndim, pcoord, ierr )
278	CALL MPI_CART_SHIFT( comm2d, 0, 1, pleft, pright, ierr )
279	CALL MPI_CART_SHIFT( comm2d, 1, 1, psouth, pnorth, ierr )
280
281	!
282	!-- Determine sub-topologies for transpositions
283	!-- Transposition from z to x:
284	remain_dims(1) = .TRUE.
285	remain_dims(2) = .FALSE.
286	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dx, ierr )
287	CALL MPI_COMM_RANK( comm1dx, myidx, ierr )
288	!
289	!-- Transposition from x to y
290	remain_dims(1) = .FALSE.
291	remain_dims(2) = .TRUE.
292	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dy, ierr )
293	CALL MPI_COMM_RANK( comm1dy, myidy, ierr )
294
295	#endif
296
297	!
298	!-- Calculate array bounds along x-direction for every PE.
299	ALLOCATE( nxlf(0:pdims(1)-1), nxrf(0:pdims(1)-1), nynf(0:pdims(2)-1), &
300	nysf(0:pdims(2)-1) )
301
302	IF ( MOD( nx+1 , pdims(1) ) /= 0 ) THEN
303	WRITE( message_string, * ) 'x-direction: gridpoint number (',nx+1,') ',&
304	'is not an& integral divisor of the number ', &
305	'processors (', pdims(1),')'
306	CALL message( 'init_pegrid', 'PA0225', 1, 2, 0, 6, 0 )
307	ELSE
308	nnx = ( nx + 1 ) / pdims(1)
309	IF ( nnx*pdims(1) - ( nx + 1) > nnx ) THEN
310	WRITE( message_string, * ) 'x-direction: nx does not match the', &
311	'requirements given by the number of PEs &used', &
312	'& please use nx = ', nx - ( pdims(1) - ( nnx*pdims(1) &
313	- ( nx + 1 ) ) ), ' instead of nx =', nx
314	CALL message( 'init_pegrid', 'PA0226', 1, 2, 0, 6, 0 )
315	ENDIF
316	ENDIF
317
318	!
319	!-- Left and right array bounds, number of gridpoints
320	DO i = 0, pdims(1)-1
321	nxlf(i) = i * nnx
322	nxrf(i) = ( i + 1 ) * nnx - 1
323	ENDDO
324
325	!
326	!-- Calculate array bounds in y-direction for every PE.
327	IF ( MOD( ny+1 , pdims(2) ) /= 0 ) THEN
328	WRITE( message_string, * ) 'y-direction: gridpoint number (',ny+1,') ', &
329	'is not an& integral divisor of the number of', &
330	'processors (', pdims(2),')'
331	CALL message( 'init_pegrid', 'PA0227', 1, 2, 0, 6, 0 )
332	ELSE
333	nny = ( ny + 1 ) / pdims(2)
334	IF ( nny*pdims(2) - ( ny + 1) > nny ) THEN
335	WRITE( message_string, * ) 'y-direction: ny does not match the', &
336	'requirements given by the number of PEs &used ', &
337	'& please use ny = ', ny - ( pdims(2) - ( nnx*pdims(2) &
338	- ( ny + 1 ) ) ), ' instead of ny =', ny
339	CALL message( 'init_pegrid', 'PA0228', 1, 2, 0, 6, 0 )
340	ENDIF
341	ENDIF
342
343	!
344	!-- South and north array bounds
345	DO j = 0, pdims(2)-1
346	nysf(j) = j * nny
347	nynf(j) = ( j + 1 ) * nny - 1
348	ENDDO
349
350	!
351	!-- Local array bounds of the respective PEs
352	nxl = nxlf(pcoord(1))
353	nxr = nxrf(pcoord(1))
354	nys = nysf(pcoord(2))
355	nyn = nynf(pcoord(2))
356	nzb = 0
357	nzt = nz
358	nnz = nz
359
360	!
361	!-- Set switches to define if the PE is situated at the border of the virtual
362	!-- processor grid
363	IF ( nxl == 0 ) left_border_pe = .TRUE.
364	IF ( nxr == nx ) right_border_pe = .TRUE.
365	IF ( nys == 0 ) south_border_pe = .TRUE.
366	IF ( nyn == ny ) north_border_pe = .TRUE.
367
368	!
369	!-- Calculate array bounds and gridpoint numbers for the transposed arrays
370	!-- (needed in the pressure solver)
371	!-- For the transposed arrays, cyclic boundaries as well as top and bottom
372	!-- boundaries are omitted, because they are obstructive to the transposition
373
374	!
375	!-- 1. transposition z --> x
376	!-- This transposition is not neccessary in case of a 1d-decomposition along x
377	nys_x = nys
378	nyn_x = nyn
379	nny_x = nny
380	nnz_x = nz / pdims(1)
381	nzb_x = 1 + myidx * nnz_x
382	nzt_x = ( myidx + 1 ) * nnz_x
383	sendrecvcount_zx = nnx * nny * nnz_x
384
385	IF ( pdims(2) /= 1 ) THEN
386	IF ( MOD( nz , pdims(1) ) /= 0 ) THEN
387	WRITE( message_string, * ) 'transposition z --> x:', &
388	'&nz=',nz,' is not an integral divisior of pdims(1)=', &
389	pdims(1)
390	CALL message( 'init_pegrid', 'PA0230', 1, 2, 0, 6, 0 )
391	ENDIF
392	ENDIF
393
394	!
395	!-- 2. transposition x --> y
396	nnz_y = nnz_x
397	nzb_y = nzb_x
398	nzt_y = nzt_x
399	IF ( MOD( nx+1 , pdims(2) ) /= 0 ) THEN
400	WRITE( message_string, * ) 'transposition x --> y:', &
401	'&nx+1=',nx+1,' is not an integral divisor of ',&
402	'pdims(2)=',pdims(2)
403	CALL message( 'init_pegrid', 'PA0231', 1, 2, 0, 6, 0 )
404	ENDIF
405	nnx_y = (nx+1) / pdims(2)
406	nxl_y = myidy * nnx_y
407	nxr_y = ( myidy + 1 ) * nnx_y - 1
408	sendrecvcount_xy = nnx_y * nny_x * nnz_y
409
410	!
411	!-- 3. transposition y --> z (ELSE: x --> y in case of 1D-decomposition
412	!-- along x)
413	nnx_z = nnx_y
414	nxl_z = nxl_y
415	nxr_z = nxr_y
416	nny_z = (ny+1) / pdims(1)
417	nys_z = myidx * nny_z
418	nyn_z = ( myidx + 1 ) * nny_z - 1
419	sendrecvcount_yz = nnx_y * nny_z * nnz_y
420
421	IF ( pdims(2) /= 1 ) THEN
422	!
423	!-- y --> z
424	!-- This transposition is not neccessary in case of a 1d-decomposition
425	!-- along x, except that the uptream-spline method is switched on
426	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
427	WRITE( message_string, * ) 'transposition y --> z:', &
428	'& ny+1=',ny+1,' is not an integral divisor of ',&
429	'pdims(1)=',pdims(1)
430	CALL message( 'init_pegrid', 'PA0232', 1, 2, 0, 6, 0 )
431	ENDIF
432
433	ELSE
434	!
435	!-- x --> y. This condition must be fulfilled for a 1D-decomposition along x
436	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
437	WRITE( message_string, * ) 'transposition x --> y:', &
438	'& ny+1=',ny+1,' is not an integral divisor of ',&
439	'pdims(1)=',pdims(1)
440	CALL message( 'init_pegrid', 'PA0233', 1, 2, 0, 6, 0 )
441	ENDIF
442
443	ENDIF
444
445	!
446	!-- Indices for direct transpositions z --> y (used for calculating spectra)
447	IF ( dt_dosp /= 9999999.9_wp ) THEN
448	IF ( MOD( nz, pdims(2) ) /= 0 ) THEN
449	WRITE( message_string, * ) 'direct transposition z --> y (needed ', &
450	'for spectra):& nz=',nz,' is not an integral divisor of ',&
451	'pdims(2)=',pdims(2)
452	CALL message( 'init_pegrid', 'PA0234', 1, 2, 0, 6, 0 )
453	ELSE
454	nxl_yd = nxl
455	nxr_yd = nxr
456	nzb_yd = 1 + myidy * ( nz / pdims(2) )
457	nzt_yd = ( myidy + 1 ) * ( nz / pdims(2) )
458	sendrecvcount_zyd = nnx * nny * ( nz / pdims(2) )
459	ENDIF
460	ENDIF
461
462	!
463	!-- Indices for direct transpositions y --> x (they are only possible in case
464	!-- of a 1d-decomposition along x)
465	IF ( pdims(2) == 1 ) THEN
466	nny_x = nny / pdims(1)
467	nys_x = myid * nny_x
468	nyn_x = ( myid + 1 ) * nny_x - 1
469	nzb_x = 1
470	nzt_x = nz
471	sendrecvcount_xy = nnx * nny_x * nz
472	ENDIF
473
474	!
475	!-- Indices for direct transpositions x --> y (they are only possible in case
476	!-- of a 1d-decomposition along y)
477	IF ( pdims(1) == 1 ) THEN
478	nnx_y = nnx / pdims(2)
479	nxl_y = myid * nnx_y
480	nxr_y = ( myid + 1 ) * nnx_y - 1
481	nzb_y = 1
482	nzt_y = nz
483	sendrecvcount_xy = nnx_y * nny * nz
484	ENDIF
485
486	!
487	!-- Arrays for storing the array bounds are needed any more
488	DEALLOCATE( nxlf , nxrf , nynf , nysf )
489
490
491	#if ! defined( __check)
492	!
493	!-- Collect index bounds from other PEs (to be written to restart file later)
494	ALLOCATE( hor_index_bounds(4,0:numprocs-1) )
495
496	IF ( myid == 0 ) THEN
497
498	hor_index_bounds(1,0) = nxl
499	hor_index_bounds(2,0) = nxr
500	hor_index_bounds(3,0) = nys
501	hor_index_bounds(4,0) = nyn
502
503	!
504	!-- Receive data from all other PEs
505	DO i = 1, numprocs-1
506	CALL MPI_RECV( ibuf, 4, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
507	ierr )
508	hor_index_bounds(:,i) = ibuf(1:4)
509	ENDDO
510
511	ELSE
512	!
513	!-- Send index bounds to PE0
514	ibuf(1) = nxl
515	ibuf(2) = nxr
516	ibuf(3) = nys
517	ibuf(4) = nyn
518	CALL MPI_SEND( ibuf, 4, MPI_INTEGER, 0, myid, comm2d, ierr )
519
520	ENDIF
521
522	#endif
523
524	#if defined( __print )
525	!
526	!-- Control output
527	IF ( myid == 0 ) THEN
528	PRINT, ' processor topology *'
529	PRINT*, ' '
530	PRINT*, 'myid pcoord left right south north idx idy nxl: nxr',&
531	&' nys: nyn'
532	PRINT*, '------------------------------------------------------------',&
533	&'-----------'
534	WRITE (*,1000) 0, pcoord(1), pcoord(2), pleft, pright, psouth, pnorth, &
535	myidx, myidy, nxl, nxr, nys, nyn
536	1000 FORMAT (I4,2X,'(',I3,',',I3,')',3X,I4,2X,I4,3X,I4,2X,I4,2X,I3,1X,I3, &
537	2(2X,I4,':',I4))
538
539	!
540	!-- Receive data from the other PEs
541	DO i = 1,numprocs-1
542	CALL MPI_RECV( ibuf, 12, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
543	ierr )
544	WRITE (*,1000) i, ( ibuf(j) , j = 1,12 )
545	ENDDO
546	ELSE
547
548	!
549	!-- Send data to PE0
550	ibuf(1) = pcoord(1); ibuf(2) = pcoord(2); ibuf(3) = pleft
551	ibuf(4) = pright; ibuf(5) = psouth; ibuf(6) = pnorth; ibuf(7) = myidx
552	ibuf(8) = myidy; ibuf(9) = nxl; ibuf(10) = nxr; ibuf(11) = nys
553	ibuf(12) = nyn
554	CALL MPI_SEND( ibuf, 12, MPI_INTEGER, 0, myid, comm2d, ierr )
555	ENDIF
556	#endif
557
558	#if defined( __parallel ) && ! defined( __check)
559	#if defined( __mpi2 )
560	!
561	!-- In case of coupled runs, get the port name on PE0 of the atmosphere model
562	!-- and pass it to PE0 of the ocean model
563	IF ( myid == 0 ) THEN
564
565	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
566
567	CALL MPI_OPEN_PORT( MPI_INFO_NULL, port_name, ierr )
568
569	CALL MPI_PUBLISH_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, &
570	ierr )
571
572	!
573	!-- Write a flag file for the ocean model and the other atmosphere
574	!-- processes.
575	!-- There seems to be a bug in MPICH2 which causes hanging processes
576	!-- in case that execution of LOOKUP_NAME is continued too early
577	!-- (i.e. before the port has been created)
578	OPEN( 90, FILE='COUPLING_PORT_OPENED', FORM='FORMATTED' )
579	WRITE ( 90, '(''TRUE'')' )
580	CLOSE ( 90 )
581
582	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
583
584	!
585	!-- Continue only if the atmosphere model has created the port.
586	!-- There seems to be a bug in MPICH2 which causes hanging processes
587	!-- in case that execution of LOOKUP_NAME is continued too early
588	!-- (i.e. before the port has been created)
589	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
590	DO WHILE ( .NOT. found )
591	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
592	ENDDO
593
594	CALL MPI_LOOKUP_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, ierr )
595
596	ENDIF
597
598	ENDIF
599
600	!
601	!-- In case of coupled runs, establish the connection between the atmosphere
602	!-- and the ocean model and define the intercommunicator (comm_inter)
603	CALL MPI_BARRIER( comm2d, ierr )
604	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
605
606	CALL MPI_COMM_ACCEPT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
607	comm_inter, ierr )
608	coupling_mode_remote = 'ocean_to_atmosphere'
609
610	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
611
612	CALL MPI_COMM_CONNECT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
613	comm_inter, ierr )
614	coupling_mode_remote = 'atmosphere_to_ocean'
615
616	ENDIF
617	#endif
618
619	!
620	!-- Determine the number of ghost point layers
621	IF ( ( scalar_advec == 'ws-scheme' .AND. .NOT. neutral ) .OR. &
622	scalar_advec == 'ws-scheme-mono' .OR. &
623	momentum_advec == 'ws-scheme' ) THEN
624	nbgp = 3
625	ELSE
626	nbgp = 1
627	ENDIF
628
629	!
630	!-- Create a new MPI derived datatype for the exchange of surface (xy) data,
631	!-- which is needed for coupled atmosphere-ocean runs.
632	!-- First, calculate number of grid points of an xy-plane.
633	ngp_xy = ( nxr - nxl + 1 + 2 * nbgp ) * ( nyn - nys + 1 + 2 * nbgp )
634	CALL MPI_TYPE_VECTOR( ngp_xy, 1, nzt-nzb+2, MPI_REAL, type_xy, ierr )
635	CALL MPI_TYPE_COMMIT( type_xy, ierr )
636
637	IF ( TRIM( coupling_mode ) /= 'uncoupled' ) THEN
638
639	!
640	!-- Pass the number of grid points of the atmosphere model to
641	!-- the ocean model and vice versa
642	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
643
644	nx_a = nx
645	ny_a = ny
646
647	IF ( myid == 0 ) THEN
648
649	CALL MPI_SEND( nx_a, 1, MPI_INTEGER, numprocs, 1, comm_inter, &
650	ierr )
651	CALL MPI_SEND( ny_a, 1, MPI_INTEGER, numprocs, 2, comm_inter, &
652	ierr )
653	CALL MPI_SEND( pdims, 2, MPI_INTEGER, numprocs, 3, comm_inter, &
654	ierr )
655	CALL MPI_RECV( nx_o, 1, MPI_INTEGER, numprocs, 4, comm_inter, &
656	status, ierr )
657	CALL MPI_RECV( ny_o, 1, MPI_INTEGER, numprocs, 5, comm_inter, &
658	status, ierr )
659	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, numprocs, 6, &
660	comm_inter, status, ierr )
661	ENDIF
662
663	CALL MPI_BCAST( nx_o, 1, MPI_INTEGER, 0, comm2d, ierr )
664	CALL MPI_BCAST( ny_o, 1, MPI_INTEGER, 0, comm2d, ierr )
665	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr )
666
667	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
668
669	nx_o = nx
670	ny_o = ny
671
672	IF ( myid == 0 ) THEN
673
674	CALL MPI_RECV( nx_a, 1, MPI_INTEGER, 0, 1, comm_inter, status, &
675	ierr )
676	CALL MPI_RECV( ny_a, 1, MPI_INTEGER, 0, 2, comm_inter, status, &
677	ierr )
678	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, 0, 3, comm_inter, &
679	status, ierr )
680	CALL MPI_SEND( nx_o, 1, MPI_INTEGER, 0, 4, comm_inter, ierr )
681	CALL MPI_SEND( ny_o, 1, MPI_INTEGER, 0, 5, comm_inter, ierr )
682	CALL MPI_SEND( pdims, 2, MPI_INTEGER, 0, 6, comm_inter, ierr )
683	ENDIF
684
685	CALL MPI_BCAST( nx_a, 1, MPI_INTEGER, 0, comm2d, ierr)
686	CALL MPI_BCAST( ny_a, 1, MPI_INTEGER, 0, comm2d, ierr)
687	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr)
688
689	ENDIF
690
691	ngp_a = ( nx_a+1 + 2 * nbgp ) * ( ny_a+1 + 2 * nbgp )
692	ngp_o = ( nx_o+1 + 2 * nbgp ) * ( ny_o+1 + 2 * nbgp )
693
694	!
695	!-- Determine if the horizontal grid and the number of PEs in ocean and
696	!-- atmosphere is same or not
697	IF ( nx_o == nx_a .AND. ny_o == ny_a .AND. &
698	pdims(1) == pdims_remote(1) .AND. pdims(2) == pdims_remote(2) ) &
699	THEN
700	coupling_topology = 0
701	ELSE
702	coupling_topology = 1
703	ENDIF
704
705	!
706	!-- Determine the target PEs for the exchange between ocean and
707	!-- atmosphere (comm2d)
708	IF ( coupling_topology == 0 ) THEN
709	!
710	!-- In case of identical topologies, every atmosphere PE has exactly one
711	!-- ocean PE counterpart and vice versa
712	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
713	target_id = myid + numprocs
714	ELSE
715	target_id = myid
716	ENDIF
717
718	ELSE
719	!
720	!-- In case of nonequivalent topology in ocean and atmosphere only for
721	!-- PE0 in ocean and PE0 in atmosphere a target_id is needed, since
722	!-- data echxchange between ocean and atmosphere will be done only
723	!-- between these PEs.
724	IF ( myid == 0 ) THEN
725
726	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
727	target_id = numprocs
728	ELSE
729	target_id = 0
730	ENDIF
731
732	ENDIF
733
734	ENDIF
735
736	ENDIF
737
738
739	#endif
740
741	#else
742
743	!
744	!-- Array bounds when running on a single PE (respectively a non-parallel
745	!-- machine)
746	nxl = 0
747	nxr = nx
748	nnx = nxr - nxl + 1
749	nys = 0
750	nyn = ny
751	nny = nyn - nys + 1
752	nzb = 0
753	nzt = nz
754	nnz = nz
755
756	ALLOCATE( hor_index_bounds(4,0:0) )
757	hor_index_bounds(1,0) = nxl
758	hor_index_bounds(2,0) = nxr
759	hor_index_bounds(3,0) = nys
760	hor_index_bounds(4,0) = nyn
761
762	!
763	!-- Array bounds for the pressure solver (in the parallel code, these bounds
764	!-- are the ones for the transposed arrays)
765	nys_x = nys
766	nyn_x = nyn
767	nzb_x = nzb + 1
768	nzt_x = nzt
769
770	nxl_y = nxl
771	nxr_y = nxr
772	nzb_y = nzb + 1
773	nzt_y = nzt
774
775	nxl_z = nxl
776	nxr_z = nxr
777	nys_z = nys
778	nyn_z = nyn
779
780	#endif
781
782	!
783	!-- Calculate number of grid levels necessary for the multigrid poisson solver
784	!-- as well as the gridpoint indices on each level
785	IF ( psolver(1:9) == 'multigrid' ) THEN
786
787	!
788	!-- First calculate number of possible grid levels for the subdomains
789	mg_levels_x = 1
790	mg_levels_y = 1
791	mg_levels_z = 1
792
793	i = nnx
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 = nny
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	k = nz ! do not use nnz because it might be > nz due to transposition
806	! requirements
807	DO WHILE ( MOD( k, 2 ) == 0 .AND. k /= 2 )
808	k = k / 2
809	mg_levels_z = mg_levels_z + 1
810	ENDDO
811
812	maximum_grid_level = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
813
814	!
815	!-- Find out, if the total domain allows more levels. These additional
816	!-- levels are identically processed on all PEs.
817	IF ( numprocs > 1 .AND. mg_switch_to_pe0_level /= -1 ) THEN
818
819	IF ( mg_levels_z > MIN( mg_levels_x, mg_levels_y ) ) THEN
820
821	mg_switch_to_pe0_level_l = maximum_grid_level
822
823	mg_levels_x = 1
824	mg_levels_y = 1
825
826	i = nx+1
827	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
828	i = i / 2
829	mg_levels_x = mg_levels_x + 1
830	ENDDO
831
832	j = ny+1
833	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
834	j = j / 2
835	mg_levels_y = mg_levels_y + 1
836	ENDDO
837
838	maximum_grid_level_l = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
839
840	IF ( maximum_grid_level_l > mg_switch_to_pe0_level_l ) THEN
841	mg_switch_to_pe0_level_l = maximum_grid_level_l - &
842	mg_switch_to_pe0_level_l + 1
843	ELSE
844	mg_switch_to_pe0_level_l = 0
845	ENDIF
846
847	ELSE
848	mg_switch_to_pe0_level_l = 0
849	maximum_grid_level_l = maximum_grid_level
850
851	ENDIF
852
853	!
854	!-- Use switch level calculated above only if it is not pre-defined
855	!-- by user
856	IF ( mg_switch_to_pe0_level == 0 ) THEN
857	IF ( mg_switch_to_pe0_level_l /= 0 ) THEN
858	mg_switch_to_pe0_level = mg_switch_to_pe0_level_l
859	maximum_grid_level = maximum_grid_level_l
860	ENDIF
861
862	ELSE
863	!
864	!-- Check pre-defined value and reset to default, if neccessary
865	IF ( mg_switch_to_pe0_level < mg_switch_to_pe0_level_l .OR. &
866	mg_switch_to_pe0_level >= maximum_grid_level_l ) THEN
867	message_string = 'mg_switch_to_pe0_level ' // &
868	'out of range and reset to default (=0)'
869	CALL message( 'init_pegrid', 'PA0235', 0, 1, 0, 6, 0 )
870	mg_switch_to_pe0_level = 0
871	ELSE
872	!
873	!-- Use the largest number of possible levels anyway and recalculate
874	!-- the switch level to this largest number of possible values
875	maximum_grid_level = maximum_grid_level_l
876
877	ENDIF
878
879	ENDIF
880
881	ENDIF
882
883	ALLOCATE( grid_level_count(maximum_grid_level), &
884	nxl_mg(0:maximum_grid_level), nxr_mg(0:maximum_grid_level), &
885	nyn_mg(0:maximum_grid_level), nys_mg(0:maximum_grid_level), &
886	nzt_mg(0:maximum_grid_level) )
887
888	grid_level_count = 0
889	!
890	!-- Index zero required as dummy due to definition of arrays f2 and p2 in
891	!-- recursive subroutine next_mg_level
892	nxl_mg(0) = 0; nxr_mg(0) = 0; nyn_mg(0) = 0; nys_mg(0) = 0; nzt_mg(0) = 0
893
894	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzt_l = nzt
895
896	DO i = maximum_grid_level, 1 , -1
897
898	IF ( i == mg_switch_to_pe0_level ) THEN
899	#if defined( __parallel ) && ! defined( __check )
900	!
901	!-- Save the grid size of the subdomain at the switch level, because
902	!-- it is needed in poismg.
903	ind(1) = nxl_l; ind(2) = nxr_l
904	ind(3) = nys_l; ind(4) = nyn_l
905	ind(5) = nzt_l
906	ALLOCATE( ind_all(5*numprocs), mg_loc_ind(5,0:numprocs-1) )
907	CALL MPI_ALLGATHER( ind, 5, MPI_INTEGER, ind_all, 5, &
908	MPI_INTEGER, comm2d, ierr )
909	DO j = 0, numprocs-1
910	DO k = 1, 5
911	mg_loc_ind(k,j) = ind_all(k+j*5)
912	ENDDO
913	ENDDO
914	DEALLOCATE( ind_all )
915	!
916	!-- Calculate the grid size of the total domain
917	nxr_l = ( nxr_l-nxl_l+1 ) * pdims(1) - 1
918	nxl_l = 0
919	nyn_l = ( nyn_l-nys_l+1 ) * pdims(2) - 1
920	nys_l = 0
921	!
922	!-- The size of this gathered array must not be larger than the
923	!-- array tend, which is used in the multigrid scheme as a temporary
924	!-- array. Therefore the subdomain size of an PE is calculated and
925	!-- the size of the gathered grid. These values are used in
926	!-- routines pres and poismg
927	subdomain_size = ( nxr - nxl + 2 * nbgp + 1 ) * &
928	( nyn - nys + 2 * nbgp + 1 ) * ( nzt - nzb + 2 )
929	gathered_size = ( nxr_l - nxl_l + 3 ) * ( nyn_l - nys_l + 3 ) * &
930	( nzt_l - nzb + 2 )
931
932	#elif ! defined ( __parallel )
933	message_string = 'multigrid gather/scatter impossible ' // &
934	'in non parallel mode'
935	CALL message( 'init_pegrid', 'PA0237', 1, 2, 0, 6, 0 )
936	#endif
937	ENDIF
938
939	nxl_mg(i) = nxl_l
940	nxr_mg(i) = nxr_l
941	nys_mg(i) = nys_l
942	nyn_mg(i) = nyn_l
943	nzt_mg(i) = nzt_l
944
945	nxl_l = nxl_l / 2
946	nxr_l = nxr_l / 2
947	nys_l = nys_l / 2
948	nyn_l = nyn_l / 2
949	nzt_l = nzt_l / 2
950
951	ENDDO
952
953	!
954	!-- Temporary problem: Currently calculation of maxerror iin routine poismg crashes
955	!-- if grid data are collected on PE0 already on the finest grid level.
956	!-- To be solved later.
957	IF ( maximum_grid_level == mg_switch_to_pe0_level ) THEN
958	message_string = 'grid coarsening on subdomain level cannot be performed'
959	CALL message( 'poismg', 'PA0236', 1, 2, 0, 6, 0 )
960	ENDIF
961
962	ELSE
963
964	maximum_grid_level = 0
965
966	ENDIF
967
968	!
969	!-- Default level 0 tells exchange_horiz that all ghost planes have to be
970	!-- exchanged. grid_level is adjusted in poismg, where only one ghost plane
971	!-- is required.
972	grid_level = 0
973
974	#if defined( __parallel ) && ! defined ( __check )
975	!
976	!-- Gridpoint number for the exchange of ghost points (y-line for 2D-arrays)
977	ngp_y = nyn - nys + 1 + 2 * nbgp
978
979	!
980	!-- Define new MPI derived datatypes for the exchange of ghost points in
981	!-- x- and y-direction for 2D-arrays (line)
982	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_REAL, type_x, &
983	ierr )
984	CALL MPI_TYPE_COMMIT( type_x, ierr )
985	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_INTEGER, &
986	type_x_int, ierr )
987	CALL MPI_TYPE_COMMIT( type_x_int, ierr )
988
989	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_REAL, type_y, ierr )
990	CALL MPI_TYPE_COMMIT( type_y, ierr )
991	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_INTEGER, type_y_int, ierr )
992	CALL MPI_TYPE_COMMIT( type_y_int, ierr )
993
994
995	!
996	!-- Calculate gridpoint numbers for the exchange of ghost points along x
997	!-- (yz-plane for 3D-arrays) and define MPI derived data type(s) for the
998	!-- exchange of ghost points in y-direction (xz-plane).
999	!-- Do these calculations for the model grid and (if necessary) also
1000	!-- for the coarser grid levels used in the multigrid method
1001	ALLOCATE ( ngp_xz(0:maximum_grid_level), ngp_yz(0:maximum_grid_level), &
1002	type_xz(0:maximum_grid_level), type_yz(0:maximum_grid_level) )
1003
1004	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzb_l = nzb; nzt_l = nzt
1005
1006	!
1007	!-- Discern between the model grid, which needs nbgp ghost points and
1008	!-- grid levels for the multigrid scheme. In the latter case only one
1009	!-- ghost point is necessary.
1010	!-- First definition of MPI-datatypes for exchange of ghost layers on normal
1011	!-- grid. The following loop is needed for data exchange in poismg.f90.
1012	!
1013	!-- Determine number of grid points of yz-layer for exchange
1014	ngp_yz(0) = (nzt - nzb + 2) * (nyn - nys + 1 + 2 * nbgp)
1015
1016	!
1017	!-- Define an MPI-datatype for the exchange of left/right boundaries.
1018	!-- Although data are contiguous in physical memory (which does not
1019	!-- necessarily require an MPI-derived datatype), the data exchange between
1020	!-- left and right PE's using the MPI-derived type is 10% faster than without.
1021	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2nbgp, nbgp(nzt-nzb+2), ngp_yz(0), &
1022	MPI_REAL, type_xz(0), ierr )
1023	CALL MPI_TYPE_COMMIT( type_xz(0), ierr )
1024
1025	CALL MPI_TYPE_VECTOR( nbgp, ngp_yz(0), ngp_yz(0), MPI_REAL, type_yz(0), &
1026	ierr )
1027	CALL MPI_TYPE_COMMIT( type_yz(0), ierr )
1028
1029	!
1030	!-- Definition of MPI-datatypes for multigrid method (coarser level grids)
1031	IF ( psolver(1:9) == 'multigrid' ) THEN
1032	!
1033	!-- Definition of MPI-datatyoe as above, but only 1 ghost level is used
1034	DO i = maximum_grid_level, 1 , -1
1035
1036	ngp_xz(i) = (nzt_l - nzb_l + 2) * (nxr_l - nxl_l + 3)
1037	ngp_yz(i) = (nzt_l - nzb_l + 2) * (nyn_l - nys_l + 3)
1038
1039	CALL MPI_TYPE_VECTOR( nxr_l-nxl_l+3, nzt_l-nzb_l+2, ngp_yz(i), &
1040	MPI_REAL, type_xz(i), ierr )
1041	CALL MPI_TYPE_COMMIT( type_xz(i), ierr )
1042
1043	CALL MPI_TYPE_VECTOR( 1, ngp_yz(i), ngp_yz(i), MPI_REAL, type_yz(i), &
1044	ierr )
1045	CALL MPI_TYPE_COMMIT( type_yz(i), ierr )
1046
1047	nxl_l = nxl_l / 2
1048	nxr_l = nxr_l / 2
1049	nys_l = nys_l / 2
1050	nyn_l = nyn_l / 2
1051	nzt_l = nzt_l / 2
1052
1053	ENDDO
1054
1055	ENDIF
1056	!
1057	!-- Define data types for exchange of 3D Integer arrays.
1058	ngp_yz_int = (nzt - nzb + 2) * (nyn - nys + 1 + 2 * nbgp)
1059
1060	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2nbgp, nbgp(nzt-nzb+2), ngp_yz_int, &
1061	MPI_INTEGER, type_xz_int, ierr )
1062	CALL MPI_TYPE_COMMIT( type_xz_int, ierr )
1063
1064	CALL MPI_TYPE_VECTOR( nbgp, ngp_yz_int, ngp_yz_int, MPI_INTEGER, type_yz_int, &
1065	ierr )
1066	CALL MPI_TYPE_COMMIT( type_yz_int, ierr )
1067
1068	#endif
1069
1070	#if defined( __parallel ) && ! defined ( __check )
1071	!
1072	!-- Setting of flags for inflow/outflow/nesting conditions in case of non-cyclic
1073	!-- horizontal boundary conditions.
1074	IF ( pleft == MPI_PROC_NULL ) THEN
1075	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1076	inflow_l = .TRUE.
1077	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1078	outflow_l = .TRUE.
1079	ELSEIF ( bc_lr == 'nested' ) THEN
1080	nest_bound_l = .TRUE.
1081	ENDIF
1082	ENDIF
1083
1084	IF ( pright == MPI_PROC_NULL ) THEN
1085	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1086	outflow_r = .TRUE.
1087	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1088	inflow_r = .TRUE.
1089	ELSEIF ( bc_lr == 'nested' ) THEN
1090	nest_bound_r = .TRUE.
1091	ENDIF
1092	ENDIF
1093
1094	IF ( psouth == MPI_PROC_NULL ) THEN
1095	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1096	outflow_s = .TRUE.
1097	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1098	inflow_s = .TRUE.
1099	ELSEIF ( bc_ns == 'nested' ) THEN
1100	nest_bound_s = .TRUE.
1101	ENDIF
1102	ENDIF
1103
1104	IF ( pnorth == MPI_PROC_NULL ) THEN
1105	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1106	inflow_n = .TRUE.
1107	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1108	outflow_n = .TRUE.
1109	ELSEIF ( bc_ns == 'nested' ) THEN
1110	nest_bound_n = .TRUE.
1111	ENDIF
1112	ENDIF
1113
1114	!
1115	!-- Broadcast the id of the inflow PE
1116	IF ( inflow_l ) THEN
1117	id_inflow_l = myidx
1118	ELSE
1119	id_inflow_l = 0
1120	ENDIF
1121	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1122	CALL MPI_ALLREDUCE( id_inflow_l, id_inflow, 1, MPI_INTEGER, MPI_SUM, &
1123	comm1dx, ierr )
1124
1125	!
1126	!-- Broadcast the id of the recycling plane
1127	!-- WARNING: needs to be adjusted in case of inflows other than from left side!
1128	IF ( NINT( recycling_width / dx ) >= nxl .AND. &
1129	NINT( recycling_width / dx ) <= nxr ) THEN
1130	id_recycling_l = myidx
1131	ELSE
1132	id_recycling_l = 0
1133	ENDIF
1134	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1135	CALL MPI_ALLREDUCE( id_recycling_l, id_recycling, 1, MPI_INTEGER, MPI_SUM, &
1136	comm1dx, ierr )
1137
1138	CALL location_message( 'finished', .TRUE. )
1139
1140	#elif ! defined ( __parallel )
1141	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1142	inflow_l = .TRUE.
1143	outflow_r = .TRUE.
1144	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1145	outflow_l = .TRUE.
1146	inflow_r = .TRUE.
1147	ENDIF
1148
1149	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1150	inflow_n = .TRUE.
1151	outflow_s = .TRUE.
1152	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1153	outflow_n = .TRUE.
1154	inflow_s = .TRUE.
1155	ENDIF
1156	#endif
1157
1158	!
1159	!-- At the inflow or outflow, u or v, respectively, have to be calculated for
1160	!-- one more grid point.
1161	IF ( inflow_l .OR. outflow_l .OR. nest_bound_l ) THEN
1162	nxlu = nxl + 1
1163	ELSE
1164	nxlu = nxl
1165	ENDIF
1166	IF ( inflow_s .OR. outflow_s .OR. nest_bound_s ) THEN
1167	nysv = nys + 1
1168	ELSE
1169	nysv = nys
1170	ENDIF
1171
1172	!
1173	!-- Allocate wall flag arrays used in the multigrid solver
1174	IF ( psolver(1:9) == 'multigrid' ) THEN
1175
1176	DO i = maximum_grid_level, 1, -1
1177
1178	SELECT CASE ( i )
1179
1180	CASE ( 1 )
1181	ALLOCATE( wall_flags_1(nzb:nzt_mg(i)+1, &
1182	nys_mg(i)-1:nyn_mg(i)+1, &
1183	nxl_mg(i)-1:nxr_mg(i)+1) )
1184
1185	CASE ( 2 )
1186	ALLOCATE( wall_flags_2(nzb:nzt_mg(i)+1, &
1187	nys_mg(i)-1:nyn_mg(i)+1, &
1188	nxl_mg(i)-1:nxr_mg(i)+1) )
1189
1190	CASE ( 3 )
1191	ALLOCATE( wall_flags_3(nzb:nzt_mg(i)+1, &
1192	nys_mg(i)-1:nyn_mg(i)+1, &
1193	nxl_mg(i)-1:nxr_mg(i)+1) )
1194
1195	CASE ( 4 )
1196	ALLOCATE( wall_flags_4(nzb:nzt_mg(i)+1, &
1197	nys_mg(i)-1:nyn_mg(i)+1, &
1198	nxl_mg(i)-1:nxr_mg(i)+1) )
1199
1200	CASE ( 5 )
1201	ALLOCATE( wall_flags_5(nzb:nzt_mg(i)+1, &
1202	nys_mg(i)-1:nyn_mg(i)+1, &
1203	nxl_mg(i)-1:nxr_mg(i)+1) )
1204
1205	CASE ( 6 )
1206	ALLOCATE( wall_flags_6(nzb:nzt_mg(i)+1, &
1207	nys_mg(i)-1:nyn_mg(i)+1, &
1208	nxl_mg(i)-1:nxr_mg(i)+1) )
1209
1210	CASE ( 7 )
1211	ALLOCATE( wall_flags_7(nzb:nzt_mg(i)+1, &
1212	nys_mg(i)-1:nyn_mg(i)+1, &
1213	nxl_mg(i)-1:nxr_mg(i)+1) )
1214
1215	CASE ( 8 )
1216	ALLOCATE( wall_flags_8(nzb:nzt_mg(i)+1, &
1217	nys_mg(i)-1:nyn_mg(i)+1, &
1218	nxl_mg(i)-1:nxr_mg(i)+1) )
1219
1220	CASE ( 9 )
1221	ALLOCATE( wall_flags_9(nzb:nzt_mg(i)+1, &
1222	nys_mg(i)-1:nyn_mg(i)+1, &
1223	nxl_mg(i)-1:nxr_mg(i)+1) )
1224
1225	CASE ( 10 )
1226	ALLOCATE( wall_flags_10(nzb:nzt_mg(i)+1, &
1227	nys_mg(i)-1:nyn_mg(i)+1, &
1228	nxl_mg(i)-1:nxr_mg(i)+1) )
1229
1230	CASE DEFAULT
1231	message_string = 'more than 10 multigrid levels'
1232	CALL message( 'init_pegrid', 'PA0238', 1, 2, 0, 6, 0 )
1233
1234	END SELECT
1235
1236	ENDDO
1237
1238	ENDIF
1239
1240	!
1241	!-- Calculate the number of groups into which parallel I/O is split.
1242	!-- The default for files which are opened by all PEs (or where each
1243	!-- PE opens his own independent file) is, that all PEs are doing input/output
1244	!-- in parallel at the same time. This might cause performance or even more
1245	!-- severe problems depending on the configuration of the underlying file
1246	!-- system.
1247	!-- First, set the default:
1248	IF ( maximum_parallel_io_streams == -1 .OR. &
1249	maximum_parallel_io_streams > numprocs ) THEN
1250	maximum_parallel_io_streams = numprocs
1251	ENDIF
1252
1253	!
1254	!-- Now calculate the number of io_blocks and the io_group to which the
1255	!-- respective PE belongs. I/O of the groups is done in serial, but in parallel
1256	!-- for all PEs belonging to the same group. A preliminary setting with myid
1257	!-- based on MPI_COMM_WORLD has been done in parin.
1258	io_blocks = numprocs / maximum_parallel_io_streams
1259	io_group = MOD( myid+1, io_blocks )
1260
1261
1262	END SUBROUTINE init_pegrid

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