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source: palm/trunk/SOURCE/init_pegrid.f90 @ 1777

Last change on this file since 1777 was 1765, checked in by raasch, 9 years ago
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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 1765 2016-02-28 13:30:40Z hoffmann $
26	!
27	! 1764 2016-02-28 12:45:19Z raasch
28	! cpp-statements for nesting removed
29	!
30	! 1762 2016-02-25 12:31:13Z hellstea
31	! Introduction of nested domain feature
32	!
33	! 1682 2015-10-07 23:56:08Z knoop
34	! Code annotations made doxygen readable
35	!
36	! 1677 2015-10-02 13:25:23Z boeske
37	! New MPI-data types for exchange of 3D integer arrays.
38	!
39	! 1575 2015-03-27 09:56:27Z raasch
40	! adjustments for psolver-queries, calculation of ngp_xz added
41	!
42	! 1565 2015-03-09 20:59:31Z suehring
43	! Refine if-clause for setting nbgp.
44	!
45	! 1557 2015-03-05 16:43:04Z suehring
46	! Adjustment for monotonic limiter
47	!
48	! 1468 2014-09-24 14:06:57Z maronga
49	! Adapted for use on up to 6-digit processor cores
50	!
51	! 1435 2014-07-21 10:37:02Z keck
52	! bugfix: added missing parameter coupling_mode_remote to ONLY-attribute
53	!
54	! 1402 2014-05-09 14:25:13Z raasch
55	! location messages modified
56	!
57	! 1384 2014-05-02 14:31:06Z raasch
58	! location messages added
59	!
60	! 1353 2014-04-08 15:21:23Z heinze
61	! REAL constants provided with KIND-attribute
62	!
63	! 1322 2014-03-20 16:38:49Z raasch
64	! REAL functions provided with KIND-attribute
65	!
66	! 1320 2014-03-20 08:40:49Z raasch
67	! ONLY-attribute added to USE-statements,
68	! kind-parameters added to all INTEGER and REAL declaration statements,
69	! kinds are defined in new module kinds,
70	! revision history before 2012 removed,
71	! comment fields (!:) to be used for variable explanations added to
72	! all variable declaration statements
73	!
74	! 1304 2014-03-12 10:29:42Z raasch
75	! bugfix: single core MPI runs missed some settings of transpose indices
76	!
77	! 1212 2013-08-15 08:46:27Z raasch
78	! error message for poisfft_hybrid removed
79	!
80	! 1159 2013-05-21 11:58:22Z fricke
81	! dirichlet/neumann and neumann/dirichlet removed
82	!
83	! 1139 2013-04-18 07:25:03Z raasch
84	! bugfix for calculating the id of the PE carrying the recycling plane
85	!
86	! 1111 2013-03-08 23:54:10Z raasch
87	! initialization of poisfft moved to module poisfft
88	!
89	! 1092 2013-02-02 11:24:22Z raasch
90	! unused variables removed
91	!
92	! 1056 2012-11-16 15:28:04Z raasch
93	! Indices for arrays n.._mg start from zero due to definition of arrays f2 and
94	! p2 as automatic arrays in recursive subroutine next_mg_level
95	!
96	! 1041 2012-11-06 02:36:29Z raasch
97	! a 2d virtual processor topology is used by default for all machines
98	!
99	! 1036 2012-10-22 13:43:42Z raasch
100	! code put under GPL (PALM 3.9)
101	!
102	! 1003 2012-09-14 14:35:53Z raasch
103	! subdomains must have identical size (grid matching = "match" removed)
104	!
105	! 1001 2012-09-13 14:08:46Z raasch
106	! all actions concerning upstream-spline-method removed
107	!
108	! 978 2012-08-09 08:28:32Z fricke
109	! dirichlet/neumann and neumann/dirichlet added
110	! nxlu and nysv are also calculated for inflow boundary
111	!
112	! 809 2012-01-30 13:32:58Z maronga
113	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
114	!
115	! 807 2012-01-25 11:53:51Z maronga
116	! New cpp directive "__check" implemented which is used by check_namelist_files
117	!
118	! Revision 1.1 1997/07/24 11:15:09 raasch
119	! Initial revision
120	!
121	!
122	! Description:
123	! ------------
124	!> Determination of the virtual processor topology (if not prescribed by the
125	!> user)and computation of the grid point number and array bounds of the local
126	!> domains.
127	!------------------------------------------------------------------------------!
128	SUBROUTINE init_pegrid
129
130
131	USE control_parameters, &
132	ONLY: bc_lr, bc_ns, coupling_mode, coupling_mode_remote, &
133	coupling_topology, dt_dosp, gathered_size, grid_level, &
134	grid_level_count, host, inflow_l, inflow_n, inflow_r, inflow_s, &
135	io_blocks, io_group, maximum_grid_level, &
136	maximum_parallel_io_streams, message_string, &
137	mg_switch_to_pe0_level, momentum_advec, nest_bound_l, &
138	nest_bound_n, nest_bound_r, nest_bound_s, neutral, psolver, &
139	outflow_l, outflow_n, outflow_r, outflow_s, recycling_width, &
140	scalar_advec, subdomain_size
141
142	USE grid_variables, &
143	ONLY: dx
144
145	USE indices, &
146	ONLY: mg_loc_ind, nbgp, nnx, nny, nnz, nx, nx_a, nx_o, nxl, nxl_mg, &
147	nxlu, nxr, nxr_mg, ny, ny_a, ny_o, nyn, nyn_mg, nys, nys_mg, &
148	nysv, nz, nzb, nzt, nzt_mg, wall_flags_1, wall_flags_2, &
149	wall_flags_3, wall_flags_4, wall_flags_5, wall_flags_6, &
150	wall_flags_7, wall_flags_8, wall_flags_9, wall_flags_10
151
152	USE kinds
153
154	USE pegrid
155
156	USE pmc_interface, &
157	ONLY: cpl_npex, cpl_npey, nested_run
158
159	USE transpose_indices, &
160	ONLY: nxl_y, nxl_yd, nxl_z, nxr_y, nxr_yd, nxr_z, nyn_x, nyn_z, nys_x,&
161	nys_z, nzb_x, nzb_y, nzb_yd, nzt_x, nzt_yd, nzt_y
162
163	IMPLICIT NONE
164
165	INTEGER(iwp) :: i !<
166	INTEGER(iwp) :: id_inflow_l !<
167	INTEGER(iwp) :: id_recycling_l !<
168	INTEGER(iwp) :: ind(5) !<
169	INTEGER(iwp) :: j !<
170	INTEGER(iwp) :: k !<
171	INTEGER(iwp) :: maximum_grid_level_l !<
172	INTEGER(iwp) :: mg_levels_x !<
173	INTEGER(iwp) :: mg_levels_y !<
174	INTEGER(iwp) :: mg_levels_z !<
175	INTEGER(iwp) :: mg_switch_to_pe0_level_l !<
176	INTEGER(iwp) :: nnx_y !<
177	INTEGER(iwp) :: nnx_z !<
178	INTEGER(iwp) :: nny_x !<
179	INTEGER(iwp) :: nny_z !<
180	INTEGER(iwp) :: nnz_x !<
181	INTEGER(iwp) :: nnz_y !<
182	INTEGER(iwp) :: numproc_sqr !<
183	INTEGER(iwp) :: nxl_l !<
184	INTEGER(iwp) :: nxr_l !<
185	INTEGER(iwp) :: nyn_l !<
186	INTEGER(iwp) :: nys_l !<
187	INTEGER(iwp) :: nzb_l !<
188	INTEGER(iwp) :: nzt_l !<
189	INTEGER(iwp) :: omp_get_num_threads !<
190
191	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: ind_all !<
192	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxlf !<
193	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxrf !<
194	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nynf !<
195	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nysf !<
196
197	INTEGER(iwp), DIMENSION(2) :: pdims_remote !<
198
199	#if defined( __mpi2 )
200	LOGICAL :: found !<
201	#endif
202
203	!
204	!-- Get the number of OpenMP threads
205	!$OMP PARALLEL
206	#if defined( __intel_openmp_bug )
207	threads_per_task = omp_get_num_threads()
208	#else
209	!$ threads_per_task = omp_get_num_threads()
210	#endif
211	!$OMP END PARALLEL
212
213
214	#if defined( __parallel )
215
216	CALL location_message( 'creating virtual PE grids + MPI derived data types', &
217	.FALSE. )
218
219	IF ( nested_run ) THEN
220	!
221	!-- In case of nested-domain runs, the processor grid is explicitly given
222	!-- by the user in the nestpar-NAMELIST
223	pdims(1) = cpl_npex
224	pdims(2) = cpl_npey
225
226	ELSE
227	!
228	!-- Determine the processor topology or check it, if prescribed by the user
229	IF ( npex == -1 .AND. npey == -1 ) THEN
230
231	!
232	!-- Automatic determination of the topology
233	numproc_sqr = SQRT( REAL( numprocs, KIND=wp ) )
234	pdims(1) = MAX( numproc_sqr , 1 )
235	DO WHILE ( MOD( numprocs , pdims(1) ) /= 0 )
236	pdims(1) = pdims(1) - 1
237	ENDDO
238	pdims(2) = numprocs / pdims(1)
239
240	ELSEIF ( npex /= -1 .AND. npey /= -1 ) THEN
241
242	!
243	!-- Prescribed by user. Number of processors on the prescribed topology
244	!-- must be equal to the number of PEs available to the job
245	IF ( ( npex * npey ) /= numprocs ) THEN
246	WRITE( message_string, * ) 'number of PEs of the prescribed ', &
247	'topology (', npex*npey,') does not match & the number of ', &
248	'PEs available to the job (', numprocs, ')'
249	CALL message( 'init_pegrid', 'PA0221', 1, 2, 0, 6, 0 )
250	ENDIF
251	pdims(1) = npex
252	pdims(2) = npey
253
254	ELSE
255	!
256	!-- If the processor topology is prescribed by the user, the number of
257	!-- PEs must be given in both directions
258	message_string = 'if the processor topology is prescribed by th' // &
259	'e user& both values of "npex" and "npey" must be given' // &
260	' in the &NAMELIST-parameter file'
261	CALL message( 'init_pegrid', 'PA0222', 1, 2, 0, 6, 0 )
262
263	ENDIF
264
265	ENDIF
266
267
268	!
269	!-- For communication speedup, set barriers in front of collective
270	!-- communications by default on SGI-type systems
271	IF ( host(3:5) == 'sgi' ) collective_wait = .TRUE.
272
273	!
274	!-- If necessary, set horizontal boundary conditions to non-cyclic
275	IF ( bc_lr /= 'cyclic' ) cyclic(1) = .FALSE.
276	IF ( bc_ns /= 'cyclic' ) cyclic(2) = .FALSE.
277
278
279	#if ! defined( __check)
280	!
281	!-- Create the virtual processor grid
282	CALL MPI_CART_CREATE( comm_palm, ndim, pdims, cyclic, reorder, &
283	comm2d, ierr )
284	CALL MPI_COMM_RANK( comm2d, myid, ierr )
285	WRITE (myid_char,'(''_'',I6.6)') myid
286
287	CALL MPI_CART_COORDS( comm2d, myid, ndim, pcoord, ierr )
288	CALL MPI_CART_SHIFT( comm2d, 0, 1, pleft, pright, ierr )
289	CALL MPI_CART_SHIFT( comm2d, 1, 1, psouth, pnorth, ierr )
290
291	!
292	!-- Determine sub-topologies for transpositions
293	!-- Transposition from z to x:
294	remain_dims(1) = .TRUE.
295	remain_dims(2) = .FALSE.
296	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dx, ierr )
297	CALL MPI_COMM_RANK( comm1dx, myidx, ierr )
298	!
299	!-- Transposition from x to y
300	remain_dims(1) = .FALSE.
301	remain_dims(2) = .TRUE.
302	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dy, ierr )
303	CALL MPI_COMM_RANK( comm1dy, myidy, ierr )
304
305	#endif
306
307	!
308	!-- Calculate array bounds along x-direction for every PE.
309	ALLOCATE( nxlf(0:pdims(1)-1), nxrf(0:pdims(1)-1), nynf(0:pdims(2)-1), &
310	nysf(0:pdims(2)-1) )
311
312	IF ( MOD( nx+1 , pdims(1) ) /= 0 ) THEN
313	WRITE( message_string, * ) 'x-direction: gridpoint number (',nx+1,') ',&
314	'is not an& integral divisor of the number ', &
315	'processors (', pdims(1),')'
316	CALL message( 'init_pegrid', 'PA0225', 1, 2, 0, 6, 0 )
317	ELSE
318	nnx = ( nx + 1 ) / pdims(1)
319	IF ( nnx*pdims(1) - ( nx + 1) > nnx ) THEN
320	WRITE( message_string, * ) 'x-direction: nx does not match the', &
321	'requirements given by the number of PEs &used', &
322	'& please use nx = ', nx - ( pdims(1) - ( nnx*pdims(1) &
323	- ( nx + 1 ) ) ), ' instead of nx =', nx
324	CALL message( 'init_pegrid', 'PA0226', 1, 2, 0, 6, 0 )
325	ENDIF
326	ENDIF
327
328	!
329	!-- Left and right array bounds, number of gridpoints
330	DO i = 0, pdims(1)-1
331	nxlf(i) = i * nnx
332	nxrf(i) = ( i + 1 ) * nnx - 1
333	ENDDO
334
335	!
336	!-- Calculate array bounds in y-direction for every PE.
337	IF ( MOD( ny+1 , pdims(2) ) /= 0 ) THEN
338	WRITE( message_string, * ) 'y-direction: gridpoint number (',ny+1,') ', &
339	'is not an& integral divisor of the number of', &
340	'processors (', pdims(2),')'
341	CALL message( 'init_pegrid', 'PA0227', 1, 2, 0, 6, 0 )
342	ELSE
343	nny = ( ny + 1 ) / pdims(2)
344	IF ( nny*pdims(2) - ( ny + 1) > nny ) THEN
345	WRITE( message_string, * ) 'y-direction: ny does not match the', &
346	'requirements given by the number of PEs &used ', &
347	'& please use ny = ', ny - ( pdims(2) - ( nnx*pdims(2) &
348	- ( ny + 1 ) ) ), ' instead of ny =', ny
349	CALL message( 'init_pegrid', 'PA0228', 1, 2, 0, 6, 0 )
350	ENDIF
351	ENDIF
352
353	!
354	!-- South and north array bounds
355	DO j = 0, pdims(2)-1
356	nysf(j) = j * nny
357	nynf(j) = ( j + 1 ) * nny - 1
358	ENDDO
359
360	!
361	!-- Local array bounds of the respective PEs
362	nxl = nxlf(pcoord(1))
363	nxr = nxrf(pcoord(1))
364	nys = nysf(pcoord(2))
365	nyn = nynf(pcoord(2))
366	nzb = 0
367	nzt = nz
368	nnz = nz
369
370	!
371	!-- Set switches to define if the PE is situated at the border of the virtual
372	!-- processor grid
373	IF ( nxl == 0 ) left_border_pe = .TRUE.
374	IF ( nxr == nx ) right_border_pe = .TRUE.
375	IF ( nys == 0 ) south_border_pe = .TRUE.
376	IF ( nyn == ny ) north_border_pe = .TRUE.
377
378	!
379	!-- Calculate array bounds and gridpoint numbers for the transposed arrays
380	!-- (needed in the pressure solver)
381	!-- For the transposed arrays, cyclic boundaries as well as top and bottom
382	!-- boundaries are omitted, because they are obstructive to the transposition
383
384	!
385	!-- 1. transposition z --> x
386	!-- This transposition is not neccessary in case of a 1d-decomposition along x
387	nys_x = nys
388	nyn_x = nyn
389	nny_x = nny
390	nnz_x = nz / pdims(1)
391	nzb_x = 1 + myidx * nnz_x
392	nzt_x = ( myidx + 1 ) * nnz_x
393	sendrecvcount_zx = nnx * nny * nnz_x
394
395	IF ( pdims(2) /= 1 ) THEN
396	IF ( MOD( nz , pdims(1) ) /= 0 ) THEN
397	WRITE( message_string, * ) 'transposition z --> x:', &
398	'&nz=',nz,' is not an integral divisior of pdims(1)=', &
399	pdims(1)
400	CALL message( 'init_pegrid', 'PA0230', 1, 2, 0, 6, 0 )
401	ENDIF
402	ENDIF
403
404	!
405	!-- 2. transposition x --> y
406	nnz_y = nnz_x
407	nzb_y = nzb_x
408	nzt_y = nzt_x
409	IF ( MOD( nx+1 , pdims(2) ) /= 0 ) THEN
410	WRITE( message_string, * ) 'transposition x --> y:', &
411	'&nx+1=',nx+1,' is not an integral divisor of ',&
412	'pdims(2)=',pdims(2)
413	CALL message( 'init_pegrid', 'PA0231', 1, 2, 0, 6, 0 )
414	ENDIF
415	nnx_y = (nx+1) / pdims(2)
416	nxl_y = myidy * nnx_y
417	nxr_y = ( myidy + 1 ) * nnx_y - 1
418	sendrecvcount_xy = nnx_y * nny_x * nnz_y
419
420	!
421	!-- 3. transposition y --> z (ELSE: x --> y in case of 1D-decomposition
422	!-- along x)
423	nnx_z = nnx_y
424	nxl_z = nxl_y
425	nxr_z = nxr_y
426	nny_z = (ny+1) / pdims(1)
427	nys_z = myidx * nny_z
428	nyn_z = ( myidx + 1 ) * nny_z - 1
429	sendrecvcount_yz = nnx_y * nny_z * nnz_y
430
431	IF ( pdims(2) /= 1 ) THEN
432	!
433	!-- y --> z
434	!-- This transposition is not neccessary in case of a 1d-decomposition
435	!-- along x, except that the uptream-spline method is switched on
436	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
437	WRITE( message_string, * ) 'transposition y --> z:', &
438	'& ny+1=',ny+1,' is not an integral divisor of ',&
439	'pdims(1)=',pdims(1)
440	CALL message( 'init_pegrid', 'PA0232', 1, 2, 0, 6, 0 )
441	ENDIF
442
443	ELSE
444	!
445	!-- x --> y. This condition must be fulfilled for a 1D-decomposition along x
446	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
447	WRITE( message_string, * ) 'transposition x --> y:', &
448	'& ny+1=',ny+1,' is not an integral divisor of ',&
449	'pdims(1)=',pdims(1)
450	CALL message( 'init_pegrid', 'PA0233', 1, 2, 0, 6, 0 )
451	ENDIF
452
453	ENDIF
454
455	!
456	!-- Indices for direct transpositions z --> y (used for calculating spectra)
457	IF ( dt_dosp /= 9999999.9_wp ) THEN
458	IF ( MOD( nz, pdims(2) ) /= 0 ) THEN
459	WRITE( message_string, * ) 'direct transposition z --> y (needed ', &
460	'for spectra):& nz=',nz,' is not an integral divisor of ',&
461	'pdims(2)=',pdims(2)
462	CALL message( 'init_pegrid', 'PA0234', 1, 2, 0, 6, 0 )
463	ELSE
464	nxl_yd = nxl
465	nxr_yd = nxr
466	nzb_yd = 1 + myidy * ( nz / pdims(2) )
467	nzt_yd = ( myidy + 1 ) * ( nz / pdims(2) )
468	sendrecvcount_zyd = nnx * nny * ( nz / pdims(2) )
469	ENDIF
470	ENDIF
471
472	!
473	!-- Indices for direct transpositions y --> x (they are only possible in case
474	!-- of a 1d-decomposition along x)
475	IF ( pdims(2) == 1 ) THEN
476	nny_x = nny / pdims(1)
477	nys_x = myid * nny_x
478	nyn_x = ( myid + 1 ) * nny_x - 1
479	nzb_x = 1
480	nzt_x = nz
481	sendrecvcount_xy = nnx * nny_x * nz
482	ENDIF
483
484	!
485	!-- Indices for direct transpositions x --> y (they are only possible in case
486	!-- of a 1d-decomposition along y)
487	IF ( pdims(1) == 1 ) THEN
488	nnx_y = nnx / pdims(2)
489	nxl_y = myid * nnx_y
490	nxr_y = ( myid + 1 ) * nnx_y - 1
491	nzb_y = 1
492	nzt_y = nz
493	sendrecvcount_xy = nnx_y * nny * nz
494	ENDIF
495
496	!
497	!-- Arrays for storing the array bounds are needed any more
498	DEALLOCATE( nxlf , nxrf , nynf , nysf )
499
500
501	#if ! defined( __check)
502	!
503	!-- Collect index bounds from other PEs (to be written to restart file later)
504	ALLOCATE( hor_index_bounds(4,0:numprocs-1) )
505
506	IF ( myid == 0 ) THEN
507
508	hor_index_bounds(1,0) = nxl
509	hor_index_bounds(2,0) = nxr
510	hor_index_bounds(3,0) = nys
511	hor_index_bounds(4,0) = nyn
512
513	!
514	!-- Receive data from all other PEs
515	DO i = 1, numprocs-1
516	CALL MPI_RECV( ibuf, 4, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
517	ierr )
518	hor_index_bounds(:,i) = ibuf(1:4)
519	ENDDO
520
521	ELSE
522	!
523	!-- Send index bounds to PE0
524	ibuf(1) = nxl
525	ibuf(2) = nxr
526	ibuf(3) = nys
527	ibuf(4) = nyn
528	CALL MPI_SEND( ibuf, 4, MPI_INTEGER, 0, myid, comm2d, ierr )
529
530	ENDIF
531
532	#endif
533
534	#if defined( __print )
535	!
536	!-- Control output
537	IF ( myid == 0 ) THEN
538	PRINT, ' processor topology *'
539	PRINT*, ' '
540	PRINT*, 'myid pcoord left right south north idx idy nxl: nxr',&
541	&' nys: nyn'
542	PRINT*, '------------------------------------------------------------',&
543	&'-----------'
544	WRITE (*,1000) 0, pcoord(1), pcoord(2), pleft, pright, psouth, pnorth, &
545	myidx, myidy, nxl, nxr, nys, nyn
546	1000 FORMAT (I4,2X,'(',I3,',',I3,')',3X,I4,2X,I4,3X,I4,2X,I4,2X,I3,1X,I3, &
547	2(2X,I4,':',I4))
548
549	!
550	!-- Receive data from the other PEs
551	DO i = 1,numprocs-1
552	CALL MPI_RECV( ibuf, 12, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
553	ierr )
554	WRITE (*,1000) i, ( ibuf(j) , j = 1,12 )
555	ENDDO
556	ELSE
557
558	!
559	!-- Send data to PE0
560	ibuf(1) = pcoord(1); ibuf(2) = pcoord(2); ibuf(3) = pleft
561	ibuf(4) = pright; ibuf(5) = psouth; ibuf(6) = pnorth; ibuf(7) = myidx
562	ibuf(8) = myidy; ibuf(9) = nxl; ibuf(10) = nxr; ibuf(11) = nys
563	ibuf(12) = nyn
564	CALL MPI_SEND( ibuf, 12, MPI_INTEGER, 0, myid, comm2d, ierr )
565	ENDIF
566	#endif
567
568	#if defined( __parallel ) && ! defined( __check)
569	#if defined( __mpi2 )
570	!
571	!-- In case of coupled runs, get the port name on PE0 of the atmosphere model
572	!-- and pass it to PE0 of the ocean model
573	IF ( myid == 0 ) THEN
574
575	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
576
577	CALL MPI_OPEN_PORT( MPI_INFO_NULL, port_name, ierr )
578
579	CALL MPI_PUBLISH_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, &
580	ierr )
581
582	!
583	!-- Write a flag file for the ocean model and the other atmosphere
584	!-- processes.
585	!-- There seems to be a bug in MPICH2 which causes hanging processes
586	!-- in case that execution of LOOKUP_NAME is continued too early
587	!-- (i.e. before the port has been created)
588	OPEN( 90, FILE='COUPLING_PORT_OPENED', FORM='FORMATTED' )
589	WRITE ( 90, '(''TRUE'')' )
590	CLOSE ( 90 )
591
592	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
593
594	!
595	!-- Continue only if the atmosphere model has created the port.
596	!-- There seems to be a bug in MPICH2 which causes hanging processes
597	!-- in case that execution of LOOKUP_NAME is continued too early
598	!-- (i.e. before the port has been created)
599	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
600	DO WHILE ( .NOT. found )
601	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
602	ENDDO
603
604	CALL MPI_LOOKUP_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, ierr )
605
606	ENDIF
607
608	ENDIF
609
610	!
611	!-- In case of coupled runs, establish the connection between the atmosphere
612	!-- and the ocean model and define the intercommunicator (comm_inter)
613	CALL MPI_BARRIER( comm2d, ierr )
614	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
615
616	CALL MPI_COMM_ACCEPT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
617	comm_inter, ierr )
618	coupling_mode_remote = 'ocean_to_atmosphere'
619
620	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
621
622	CALL MPI_COMM_CONNECT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
623	comm_inter, ierr )
624	coupling_mode_remote = 'atmosphere_to_ocean'
625
626	ENDIF
627	#endif
628
629	!
630	!-- Determine the number of ghost point layers
631	IF ( ( scalar_advec == 'ws-scheme' .AND. .NOT. neutral ) .OR. &
632	scalar_advec == 'ws-scheme-mono' .OR. &
633	momentum_advec == 'ws-scheme' ) THEN
634	nbgp = 3
635	ELSE
636	nbgp = 1
637	ENDIF
638
639	!
640	!-- Create a new MPI derived datatype for the exchange of surface (xy) data,
641	!-- which is needed for coupled atmosphere-ocean runs.
642	!-- First, calculate number of grid points of an xy-plane.
643	ngp_xy = ( nxr - nxl + 1 + 2 * nbgp ) * ( nyn - nys + 1 + 2 * nbgp )
644	CALL MPI_TYPE_VECTOR( ngp_xy, 1, nzt-nzb+2, MPI_REAL, type_xy, ierr )
645	CALL MPI_TYPE_COMMIT( type_xy, ierr )
646
647	IF ( TRIM( coupling_mode ) /= 'uncoupled' ) THEN
648
649	!
650	!-- Pass the number of grid points of the atmosphere model to
651	!-- the ocean model and vice versa
652	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
653
654	nx_a = nx
655	ny_a = ny
656
657	IF ( myid == 0 ) THEN
658
659	CALL MPI_SEND( nx_a, 1, MPI_INTEGER, numprocs, 1, comm_inter, &
660	ierr )
661	CALL MPI_SEND( ny_a, 1, MPI_INTEGER, numprocs, 2, comm_inter, &
662	ierr )
663	CALL MPI_SEND( pdims, 2, MPI_INTEGER, numprocs, 3, comm_inter, &
664	ierr )
665	CALL MPI_RECV( nx_o, 1, MPI_INTEGER, numprocs, 4, comm_inter, &
666	status, ierr )
667	CALL MPI_RECV( ny_o, 1, MPI_INTEGER, numprocs, 5, comm_inter, &
668	status, ierr )
669	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, numprocs, 6, &
670	comm_inter, status, ierr )
671	ENDIF
672
673	CALL MPI_BCAST( nx_o, 1, MPI_INTEGER, 0, comm2d, ierr )
674	CALL MPI_BCAST( ny_o, 1, MPI_INTEGER, 0, comm2d, ierr )
675	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr )
676
677	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
678
679	nx_o = nx
680	ny_o = ny
681
682	IF ( myid == 0 ) THEN
683
684	CALL MPI_RECV( nx_a, 1, MPI_INTEGER, 0, 1, comm_inter, status, &
685	ierr )
686	CALL MPI_RECV( ny_a, 1, MPI_INTEGER, 0, 2, comm_inter, status, &
687	ierr )
688	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, 0, 3, comm_inter, &
689	status, ierr )
690	CALL MPI_SEND( nx_o, 1, MPI_INTEGER, 0, 4, comm_inter, ierr )
691	CALL MPI_SEND( ny_o, 1, MPI_INTEGER, 0, 5, comm_inter, ierr )
692	CALL MPI_SEND( pdims, 2, MPI_INTEGER, 0, 6, comm_inter, ierr )
693	ENDIF
694
695	CALL MPI_BCAST( nx_a, 1, MPI_INTEGER, 0, comm2d, ierr)
696	CALL MPI_BCAST( ny_a, 1, MPI_INTEGER, 0, comm2d, ierr)
697	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr)
698
699	ENDIF
700
701	ngp_a = ( nx_a+1 + 2 * nbgp ) * ( ny_a+1 + 2 * nbgp )
702	ngp_o = ( nx_o+1 + 2 * nbgp ) * ( ny_o+1 + 2 * nbgp )
703
704	!
705	!-- Determine if the horizontal grid and the number of PEs in ocean and
706	!-- atmosphere is same or not
707	IF ( nx_o == nx_a .AND. ny_o == ny_a .AND. &
708	pdims(1) == pdims_remote(1) .AND. pdims(2) == pdims_remote(2) ) &
709	THEN
710	coupling_topology = 0
711	ELSE
712	coupling_topology = 1
713	ENDIF
714
715	!
716	!-- Determine the target PEs for the exchange between ocean and
717	!-- atmosphere (comm2d)
718	IF ( coupling_topology == 0 ) THEN
719	!
720	!-- In case of identical topologies, every atmosphere PE has exactly one
721	!-- ocean PE counterpart and vice versa
722	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
723	target_id = myid + numprocs
724	ELSE
725	target_id = myid
726	ENDIF
727
728	ELSE
729	!
730	!-- In case of nonequivalent topology in ocean and atmosphere only for
731	!-- PE0 in ocean and PE0 in atmosphere a target_id is needed, since
732	!-- data echxchange between ocean and atmosphere will be done only
733	!-- between these PEs.
734	IF ( myid == 0 ) THEN
735
736	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
737	target_id = numprocs
738	ELSE
739	target_id = 0
740	ENDIF
741
742	ENDIF
743
744	ENDIF
745
746	ENDIF
747
748
749	#endif
750
751	#else
752
753	!
754	!-- Array bounds when running on a single PE (respectively a non-parallel
755	!-- machine)
756	nxl = 0
757	nxr = nx
758	nnx = nxr - nxl + 1
759	nys = 0
760	nyn = ny
761	nny = nyn - nys + 1
762	nzb = 0
763	nzt = nz
764	nnz = nz
765
766	ALLOCATE( hor_index_bounds(4,0:0) )
767	hor_index_bounds(1,0) = nxl
768	hor_index_bounds(2,0) = nxr
769	hor_index_bounds(3,0) = nys
770	hor_index_bounds(4,0) = nyn
771
772	!
773	!-- Array bounds for the pressure solver (in the parallel code, these bounds
774	!-- are the ones for the transposed arrays)
775	nys_x = nys
776	nyn_x = nyn
777	nzb_x = nzb + 1
778	nzt_x = nzt
779
780	nxl_y = nxl
781	nxr_y = nxr
782	nzb_y = nzb + 1
783	nzt_y = nzt
784
785	nxl_z = nxl
786	nxr_z = nxr
787	nys_z = nys
788	nyn_z = nyn
789
790	#endif
791
792	!
793	!-- Calculate number of grid levels necessary for the multigrid poisson solver
794	!-- as well as the gridpoint indices on each level
795	IF ( psolver(1:9) == 'multigrid' ) THEN
796
797	!
798	!-- First calculate number of possible grid levels for the subdomains
799	mg_levels_x = 1
800	mg_levels_y = 1
801	mg_levels_z = 1
802
803	i = nnx
804	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
805	i = i / 2
806	mg_levels_x = mg_levels_x + 1
807	ENDDO
808
809	j = nny
810	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
811	j = j / 2
812	mg_levels_y = mg_levels_y + 1
813	ENDDO
814
815	k = nz ! do not use nnz because it might be > nz due to transposition
816	! requirements
817	DO WHILE ( MOD( k, 2 ) == 0 .AND. k /= 2 )
818	k = k / 2
819	mg_levels_z = mg_levels_z + 1
820	ENDDO
821
822	maximum_grid_level = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
823
824	!
825	!-- Find out, if the total domain allows more levels. These additional
826	!-- levels are identically processed on all PEs.
827	IF ( numprocs > 1 .AND. mg_switch_to_pe0_level /= -1 ) THEN
828
829	IF ( mg_levels_z > MIN( mg_levels_x, mg_levels_y ) ) THEN
830
831	mg_switch_to_pe0_level_l = maximum_grid_level
832
833	mg_levels_x = 1
834	mg_levels_y = 1
835
836	i = nx+1
837	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
838	i = i / 2
839	mg_levels_x = mg_levels_x + 1
840	ENDDO
841
842	j = ny+1
843	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
844	j = j / 2
845	mg_levels_y = mg_levels_y + 1
846	ENDDO
847
848	maximum_grid_level_l = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
849
850	IF ( maximum_grid_level_l > mg_switch_to_pe0_level_l ) THEN
851	mg_switch_to_pe0_level_l = maximum_grid_level_l - &
852	mg_switch_to_pe0_level_l + 1
853	ELSE
854	mg_switch_to_pe0_level_l = 0
855	ENDIF
856
857	ELSE
858	mg_switch_to_pe0_level_l = 0
859	maximum_grid_level_l = maximum_grid_level
860
861	ENDIF
862
863	!
864	!-- Use switch level calculated above only if it is not pre-defined
865	!-- by user
866	IF ( mg_switch_to_pe0_level == 0 ) THEN
867	IF ( mg_switch_to_pe0_level_l /= 0 ) THEN
868	mg_switch_to_pe0_level = mg_switch_to_pe0_level_l
869	maximum_grid_level = maximum_grid_level_l
870	ENDIF
871
872	ELSE
873	!
874	!-- Check pre-defined value and reset to default, if neccessary
875	IF ( mg_switch_to_pe0_level < mg_switch_to_pe0_level_l .OR. &
876	mg_switch_to_pe0_level >= maximum_grid_level_l ) THEN
877	message_string = 'mg_switch_to_pe0_level ' // &
878	'out of range and reset to default (=0)'
879	CALL message( 'init_pegrid', 'PA0235', 0, 1, 0, 6, 0 )
880	mg_switch_to_pe0_level = 0
881	ELSE
882	!
883	!-- Use the largest number of possible levels anyway and recalculate
884	!-- the switch level to this largest number of possible values
885	maximum_grid_level = maximum_grid_level_l
886
887	ENDIF
888
889	ENDIF
890
891	ENDIF
892
893	ALLOCATE( grid_level_count(maximum_grid_level), &
894	nxl_mg(0:maximum_grid_level), nxr_mg(0:maximum_grid_level), &
895	nyn_mg(0:maximum_grid_level), nys_mg(0:maximum_grid_level), &
896	nzt_mg(0:maximum_grid_level) )
897
898	grid_level_count = 0
899	!
900	!-- Index zero required as dummy due to definition of arrays f2 and p2 in
901	!-- recursive subroutine next_mg_level
902	nxl_mg(0) = 0; nxr_mg(0) = 0; nyn_mg(0) = 0; nys_mg(0) = 0; nzt_mg(0) = 0
903
904	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzt_l = nzt
905
906	DO i = maximum_grid_level, 1 , -1
907
908	IF ( i == mg_switch_to_pe0_level ) THEN
909	#if defined( __parallel ) && ! defined( __check )
910	!
911	!-- Save the grid size of the subdomain at the switch level, because
912	!-- it is needed in poismg.
913	ind(1) = nxl_l; ind(2) = nxr_l
914	ind(3) = nys_l; ind(4) = nyn_l
915	ind(5) = nzt_l
916	ALLOCATE( ind_all(5*numprocs), mg_loc_ind(5,0:numprocs-1) )
917	CALL MPI_ALLGATHER( ind, 5, MPI_INTEGER, ind_all, 5, &
918	MPI_INTEGER, comm2d, ierr )
919	DO j = 0, numprocs-1
920	DO k = 1, 5
921	mg_loc_ind(k,j) = ind_all(k+j*5)
922	ENDDO
923	ENDDO
924	DEALLOCATE( ind_all )
925	!
926	!-- Calculate the grid size of the total domain
927	nxr_l = ( nxr_l-nxl_l+1 ) * pdims(1) - 1
928	nxl_l = 0
929	nyn_l = ( nyn_l-nys_l+1 ) * pdims(2) - 1
930	nys_l = 0
931	!
932	!-- The size of this gathered array must not be larger than the
933	!-- array tend, which is used in the multigrid scheme as a temporary
934	!-- array. Therefore the subdomain size of an PE is calculated and
935	!-- the size of the gathered grid. These values are used in
936	!-- routines pres and poismg
937	subdomain_size = ( nxr - nxl + 2 * nbgp + 1 ) * &
938	( nyn - nys + 2 * nbgp + 1 ) * ( nzt - nzb + 2 )
939	gathered_size = ( nxr_l - nxl_l + 3 ) * ( nyn_l - nys_l + 3 ) * &
940	( nzt_l - nzb + 2 )
941
942	#elif ! defined ( __parallel )
943	message_string = 'multigrid gather/scatter impossible ' // &
944	'in non parallel mode'
945	CALL message( 'init_pegrid', 'PA0237', 1, 2, 0, 6, 0 )
946	#endif
947	ENDIF
948
949	nxl_mg(i) = nxl_l
950	nxr_mg(i) = nxr_l
951	nys_mg(i) = nys_l
952	nyn_mg(i) = nyn_l
953	nzt_mg(i) = nzt_l
954
955	nxl_l = nxl_l / 2
956	nxr_l = nxr_l / 2
957	nys_l = nys_l / 2
958	nyn_l = nyn_l / 2
959	nzt_l = nzt_l / 2
960
961	ENDDO
962
963	!
964	!-- Temporary problem: Currently calculation of maxerror iin routine poismg crashes
965	!-- if grid data are collected on PE0 already on the finest grid level.
966	!-- To be solved later.
967	IF ( maximum_grid_level == mg_switch_to_pe0_level ) THEN
968	message_string = 'grid coarsening on subdomain level cannot be performed'
969	CALL message( 'poismg', 'PA0236', 1, 2, 0, 6, 0 )
970	ENDIF
971
972	ELSE
973
974	maximum_grid_level = 0
975
976	ENDIF
977
978	!
979	!-- Default level 0 tells exchange_horiz that all ghost planes have to be
980	!-- exchanged. grid_level is adjusted in poismg, where only one ghost plane
981	!-- is required.
982	grid_level = 0
983
984	#if defined( __parallel ) && ! defined ( __check )
985	!
986	!-- Gridpoint number for the exchange of ghost points (y-line for 2D-arrays)
987	ngp_y = nyn - nys + 1 + 2 * nbgp
988
989	!
990	!-- Define new MPI derived datatypes for the exchange of ghost points in
991	!-- x- and y-direction for 2D-arrays (line)
992	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_REAL, type_x, &
993	ierr )
994	CALL MPI_TYPE_COMMIT( type_x, ierr )
995	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_INTEGER, &
996	type_x_int, ierr )
997	CALL MPI_TYPE_COMMIT( type_x_int, ierr )
998
999	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_REAL, type_y, ierr )
1000	CALL MPI_TYPE_COMMIT( type_y, ierr )
1001	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_INTEGER, type_y_int, ierr )
1002	CALL MPI_TYPE_COMMIT( type_y_int, ierr )
1003
1004
1005	!
1006	!-- Calculate gridpoint numbers for the exchange of ghost points along x
1007	!-- (yz-plane for 3D-arrays) and define MPI derived data type(s) for the
1008	!-- exchange of ghost points in y-direction (xz-plane).
1009	!-- Do these calculations for the model grid and (if necessary) also
1010	!-- for the coarser grid levels used in the multigrid method
1011	ALLOCATE ( ngp_xz(0:maximum_grid_level), ngp_yz(0:maximum_grid_level), &
1012	type_xz(0:maximum_grid_level), type_yz(0:maximum_grid_level) )
1013
1014	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzb_l = nzb; nzt_l = nzt
1015
1016	!
1017	!-- Discern between the model grid, which needs nbgp ghost points and
1018	!-- grid levels for the multigrid scheme. In the latter case only one
1019	!-- ghost point is necessary.
1020	!-- First definition of MPI-datatypes for exchange of ghost layers on normal
1021	!-- grid. The following loop is needed for data exchange in poismg.f90.
1022	!
1023	!-- Determine number of grid points of yz-layer for exchange
1024	ngp_yz(0) = (nzt - nzb + 2) * (nyn - nys + 1 + 2 * nbgp)
1025
1026	!
1027	!-- Define an MPI-datatype for the exchange of left/right boundaries.
1028	!-- Although data are contiguous in physical memory (which does not
1029	!-- necessarily require an MPI-derived datatype), the data exchange between
1030	!-- left and right PE's using the MPI-derived type is 10% faster than without.
1031	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2nbgp, nbgp(nzt-nzb+2), ngp_yz(0), &
1032	MPI_REAL, type_xz(0), ierr )
1033	CALL MPI_TYPE_COMMIT( type_xz(0), ierr )
1034
1035	CALL MPI_TYPE_VECTOR( nbgp, ngp_yz(0), ngp_yz(0), MPI_REAL, type_yz(0), &
1036	ierr )
1037	CALL MPI_TYPE_COMMIT( type_yz(0), ierr )
1038
1039	!
1040	!-- Definition of MPI-datatypes for multigrid method (coarser level grids)
1041	IF ( psolver(1:9) == 'multigrid' ) THEN
1042	!
1043	!-- Definition of MPI-datatyoe as above, but only 1 ghost level is used
1044	DO i = maximum_grid_level, 1 , -1
1045
1046	ngp_xz(i) = (nzt_l - nzb_l + 2) * (nxr_l - nxl_l + 3)
1047	ngp_yz(i) = (nzt_l - nzb_l + 2) * (nyn_l - nys_l + 3)
1048
1049	CALL MPI_TYPE_VECTOR( nxr_l-nxl_l+3, nzt_l-nzb_l+2, ngp_yz(i), &
1050	MPI_REAL, type_xz(i), ierr )
1051	CALL MPI_TYPE_COMMIT( type_xz(i), ierr )
1052
1053	CALL MPI_TYPE_VECTOR( 1, ngp_yz(i), ngp_yz(i), MPI_REAL, type_yz(i), &
1054	ierr )
1055	CALL MPI_TYPE_COMMIT( type_yz(i), ierr )
1056
1057	nxl_l = nxl_l / 2
1058	nxr_l = nxr_l / 2
1059	nys_l = nys_l / 2
1060	nyn_l = nyn_l / 2
1061	nzt_l = nzt_l / 2
1062
1063	ENDDO
1064
1065	ENDIF
1066	!
1067	!-- Define data types for exchange of 3D Integer arrays.
1068	ngp_yz_int = (nzt - nzb + 2) * (nyn - nys + 1 + 2 * nbgp)
1069
1070	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2nbgp, nbgp(nzt-nzb+2), ngp_yz_int, &
1071	MPI_INTEGER, type_xz_int, ierr )
1072	CALL MPI_TYPE_COMMIT( type_xz_int, ierr )
1073
1074	CALL MPI_TYPE_VECTOR( nbgp, ngp_yz_int, ngp_yz_int, MPI_INTEGER, type_yz_int, &
1075	ierr )
1076	CALL MPI_TYPE_COMMIT( type_yz_int, ierr )
1077
1078	#endif
1079
1080	#if defined( __parallel ) && ! defined ( __check )
1081	!
1082	!-- Setting of flags for inflow/outflow/nesting conditions in case of non-cyclic
1083	!-- horizontal boundary conditions.
1084	IF ( pleft == MPI_PROC_NULL ) THEN
1085	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1086	inflow_l = .TRUE.
1087	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1088	outflow_l = .TRUE.
1089	ELSEIF ( bc_lr == 'nested' ) THEN
1090	nest_bound_l = .TRUE.
1091	ENDIF
1092	ENDIF
1093
1094	IF ( pright == MPI_PROC_NULL ) THEN
1095	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1096	outflow_r = .TRUE.
1097	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1098	inflow_r = .TRUE.
1099	ELSEIF ( bc_lr == 'nested' ) THEN
1100	nest_bound_r = .TRUE.
1101	ENDIF
1102	ENDIF
1103
1104	IF ( psouth == MPI_PROC_NULL ) THEN
1105	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1106	outflow_s = .TRUE.
1107	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1108	inflow_s = .TRUE.
1109	ELSEIF ( bc_ns == 'nested' ) THEN
1110	nest_bound_s = .TRUE.
1111	ENDIF
1112	ENDIF
1113
1114	IF ( pnorth == MPI_PROC_NULL ) THEN
1115	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1116	inflow_n = .TRUE.
1117	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1118	outflow_n = .TRUE.
1119	ELSEIF ( bc_ns == 'nested' ) THEN
1120	nest_bound_n = .TRUE.
1121	ENDIF
1122	ENDIF
1123
1124	!
1125	!-- Broadcast the id of the inflow PE
1126	IF ( inflow_l ) THEN
1127	id_inflow_l = myidx
1128	ELSE
1129	id_inflow_l = 0
1130	ENDIF
1131	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1132	CALL MPI_ALLREDUCE( id_inflow_l, id_inflow, 1, MPI_INTEGER, MPI_SUM, &
1133	comm1dx, ierr )
1134
1135	!
1136	!-- Broadcast the id of the recycling plane
1137	!-- WARNING: needs to be adjusted in case of inflows other than from left side!
1138	IF ( NINT( recycling_width / dx ) >= nxl .AND. &
1139	NINT( recycling_width / dx ) <= nxr ) THEN
1140	id_recycling_l = myidx
1141	ELSE
1142	id_recycling_l = 0
1143	ENDIF
1144	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1145	CALL MPI_ALLREDUCE( id_recycling_l, id_recycling, 1, MPI_INTEGER, MPI_SUM, &
1146	comm1dx, ierr )
1147
1148	CALL location_message( 'finished', .TRUE. )
1149
1150	#elif ! defined ( __parallel )
1151	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1152	inflow_l = .TRUE.
1153	outflow_r = .TRUE.
1154	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1155	outflow_l = .TRUE.
1156	inflow_r = .TRUE.
1157	ENDIF
1158
1159	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1160	inflow_n = .TRUE.
1161	outflow_s = .TRUE.
1162	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1163	outflow_n = .TRUE.
1164	inflow_s = .TRUE.
1165	ENDIF
1166	#endif
1167
1168	!
1169	!-- At the inflow or outflow, u or v, respectively, have to be calculated for
1170	!-- one more grid point.
1171	IF ( inflow_l .OR. outflow_l .OR. nest_bound_l ) THEN
1172	nxlu = nxl + 1
1173	ELSE
1174	nxlu = nxl
1175	ENDIF
1176	IF ( inflow_s .OR. outflow_s .OR. nest_bound_s ) THEN
1177	nysv = nys + 1
1178	ELSE
1179	nysv = nys
1180	ENDIF
1181
1182	!
1183	!-- Allocate wall flag arrays used in the multigrid solver
1184	IF ( psolver(1:9) == 'multigrid' ) THEN
1185
1186	DO i = maximum_grid_level, 1, -1
1187
1188	SELECT CASE ( i )
1189
1190	CASE ( 1 )
1191	ALLOCATE( wall_flags_1(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 ( 2 )
1196	ALLOCATE( wall_flags_2(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 ( 3 )
1201	ALLOCATE( wall_flags_3(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 ( 4 )
1206	ALLOCATE( wall_flags_4(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 ( 5 )
1211	ALLOCATE( wall_flags_5(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 ( 6 )
1216	ALLOCATE( wall_flags_6(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 ( 7 )
1221	ALLOCATE( wall_flags_7(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 ( 8 )
1226	ALLOCATE( wall_flags_8(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 ( 9 )
1231	ALLOCATE( wall_flags_9(nzb:nzt_mg(i)+1, &
1232	nys_mg(i)-1:nyn_mg(i)+1, &
1233	nxl_mg(i)-1:nxr_mg(i)+1) )
1234
1235	CASE ( 10 )
1236	ALLOCATE( wall_flags_10(nzb:nzt_mg(i)+1, &
1237	nys_mg(i)-1:nyn_mg(i)+1, &
1238	nxl_mg(i)-1:nxr_mg(i)+1) )
1239
1240	CASE DEFAULT
1241	message_string = 'more than 10 multigrid levels'
1242	CALL message( 'init_pegrid', 'PA0238', 1, 2, 0, 6, 0 )
1243
1244	END SELECT
1245
1246	ENDDO
1247
1248	ENDIF
1249
1250	!
1251	!-- Calculate the number of groups into which parallel I/O is split.
1252	!-- The default for files which are opened by all PEs (or where each
1253	!-- PE opens his own independent file) is, that all PEs are doing input/output
1254	!-- in parallel at the same time. This might cause performance or even more
1255	!-- severe problems depending on the configuration of the underlying file
1256	!-- system.
1257	!-- First, set the default:
1258	IF ( maximum_parallel_io_streams == -1 .OR. &
1259	maximum_parallel_io_streams > numprocs ) THEN
1260	maximum_parallel_io_streams = numprocs
1261	ENDIF
1262
1263	!
1264	!-- Now calculate the number of io_blocks and the io_group to which the
1265	!-- respective PE belongs. I/O of the groups is done in serial, but in parallel
1266	!-- for all PEs belonging to the same group. A preliminary setting with myid
1267	!-- based on MPI_COMM_WORLD has been done in parin.
1268	io_blocks = numprocs / maximum_parallel_io_streams
1269	io_group = MOD( myid+1, io_blocks )
1270
1271
1272	END SUBROUTINE init_pegrid

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