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source: palm/trunk/SOURCE/init_pegrid.f90 @ 1764

Last change on this file since 1764 was 1764, checked in by raasch, 9 years ago
update of the nested domain system + some bugfixes
Property svn:keywords set to `Id`
File size: 43.3 KB

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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	! cpp-statements for nesting removed
22	!
23	! Former revisions:
24	! -----------------
25	! $Id: init_pegrid.f90 1764 2016-02-28 12:45:19Z raasch $
26	!
27	! 1762 2016-02-25 12:31:13Z hellstea
28	! Introduction of nested domain feature
29	!
30	! 1682 2015-10-07 23:56:08Z knoop
31	! Code annotations made doxygen readable
32	!
33	! 1677 2015-10-02 13:25:23Z boeske
34	! New MPI-data types for exchange of 3D integer arrays.
35	!
36	! 1575 2015-03-27 09:56:27Z raasch
37	! adjustments for psolver-queries, calculation of ngp_xz added
38	!
39	! 1565 2015-03-09 20:59:31Z suehring
40	! Refine if-clause for setting nbgp.
41	!
42	! 1557 2015-03-05 16:43:04Z suehring
43	! Adjustment for monotonic limiter
44	!
45	! 1468 2014-09-24 14:06:57Z maronga
46	! Adapted for use on up to 6-digit processor cores
47	!
48	! 1435 2014-07-21 10:37:02Z keck
49	! bugfix: added missing parameter coupling_mode_remote to ONLY-attribute
50	!
51	! 1402 2014-05-09 14:25:13Z raasch
52	! location messages modified
53	!
54	! 1384 2014-05-02 14:31:06Z raasch
55	! location messages added
56	!
57	! 1353 2014-04-08 15:21:23Z heinze
58	! REAL constants provided with KIND-attribute
59	!
60	! 1322 2014-03-20 16:38:49Z raasch
61	! REAL functions provided with KIND-attribute
62	!
63	! 1320 2014-03-20 08:40:49Z raasch
64	! ONLY-attribute added to USE-statements,
65	! kind-parameters added to all INTEGER and REAL declaration statements,
66	! kinds are defined in new module kinds,
67	! revision history before 2012 removed,
68	! comment fields (!:) to be used for variable explanations added to
69	! all variable declaration statements
70	!
71	! 1304 2014-03-12 10:29:42Z raasch
72	! bugfix: single core MPI runs missed some settings of transpose indices
73	!
74	! 1212 2013-08-15 08:46:27Z raasch
75	! error message for poisfft_hybrid removed
76	!
77	! 1159 2013-05-21 11:58:22Z fricke
78	! dirichlet/neumann and neumann/dirichlet removed
79	!
80	! 1139 2013-04-18 07:25:03Z raasch
81	! bugfix for calculating the id of the PE carrying the recycling plane
82	!
83	! 1111 2013-03-08 23:54:10Z raasch
84	! initialization of poisfft moved to module poisfft
85	!
86	! 1092 2013-02-02 11:24:22Z raasch
87	! unused variables removed
88	!
89	! 1056 2012-11-16 15:28:04Z raasch
90	! Indices for arrays n.._mg start from zero due to definition of arrays f2 and
91	! p2 as automatic arrays in recursive subroutine next_mg_level
92	!
93	! 1041 2012-11-06 02:36:29Z raasch
94	! a 2d virtual processor topology is used by default for all machines
95	!
96	! 1036 2012-10-22 13:43:42Z raasch
97	! code put under GPL (PALM 3.9)
98	!
99	! 1003 2012-09-14 14:35:53Z raasch
100	! subdomains must have identical size (grid matching = "match" removed)
101	!
102	! 1001 2012-09-13 14:08:46Z raasch
103	! all actions concerning upstream-spline-method removed
104	!
105	! 978 2012-08-09 08:28:32Z fricke
106	! dirichlet/neumann and neumann/dirichlet added
107	! nxlu and nysv are also calculated for inflow boundary
108	!
109	! 809 2012-01-30 13:32:58Z maronga
110	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
111	!
112	! 807 2012-01-25 11:53:51Z maronga
113	! New cpp directive "__check" implemented which is used by check_namelist_files
114	!
115	! Revision 1.1 1997/07/24 11:15:09 raasch
116	! Initial revision
117	!
118	!
119	! Description:
120	! ------------
121	!> Determination of the virtual processor topology (if not prescribed by the
122	!> user)and computation of the grid point number and array bounds of the local
123	!> domains.
124	!------------------------------------------------------------------------------!
125	SUBROUTINE init_pegrid
126
127
128	USE control_parameters, &
129	ONLY: bc_lr, bc_ns, coupling_mode, coupling_mode_remote, &
130	coupling_topology, dt_dosp, gathered_size, grid_level, &
131	grid_level_count, host, inflow_l, inflow_n, inflow_r, inflow_s, &
132	io_blocks, io_group, maximum_grid_level, &
133	maximum_parallel_io_streams, message_string, &
134	mg_switch_to_pe0_level, momentum_advec, nest_bound_l, &
135	nest_bound_n, nest_bound_r, nest_bound_s, neutral, psolver, &
136	outflow_l, outflow_n, outflow_r, outflow_s, recycling_width, &
137	scalar_advec, subdomain_size
138
139	USE grid_variables, &
140	ONLY: dx
141
142	USE indices, &
143	ONLY: mg_loc_ind, nbgp, nnx, nny, nnz, nx, nx_a, nx_o, nxl, nxl_mg, &
144	nxlu, nxr, nxr_mg, ny, ny_a, ny_o, nyn, nyn_mg, nys, nys_mg, &
145	nysv, nz, nzb, nzt, nzt_mg, wall_flags_1, wall_flags_2, &
146	wall_flags_3, wall_flags_4, wall_flags_5, wall_flags_6, &
147	wall_flags_7, wall_flags_8, wall_flags_9, wall_flags_10
148
149	USE kinds
150
151	USE pegrid
152
153	USE pmc_interface, &
154	ONLY: cpl_npex, cpl_npey, nested_run
155
156	USE transpose_indices, &
157	ONLY: nxl_y, nxl_yd, nxl_z, nxr_y, nxr_yd, nxr_z, nyn_x, nyn_z, nys_x,&
158	nys_z, nzb_x, nzb_y, nzb_yd, nzt_x, nzt_yd, nzt_y
159
160	IMPLICIT NONE
161
162	INTEGER(iwp) :: i !<
163	INTEGER(iwp) :: id_inflow_l !<
164	INTEGER(iwp) :: id_recycling_l !<
165	INTEGER(iwp) :: ind(5) !<
166	INTEGER(iwp) :: j !<
167	INTEGER(iwp) :: k !<
168	INTEGER(iwp) :: maximum_grid_level_l !<
169	INTEGER(iwp) :: mg_levels_x !<
170	INTEGER(iwp) :: mg_levels_y !<
171	INTEGER(iwp) :: mg_levels_z !<
172	INTEGER(iwp) :: mg_switch_to_pe0_level_l !<
173	INTEGER(iwp) :: nnx_y !<
174	INTEGER(iwp) :: nnx_z !<
175	INTEGER(iwp) :: nny_x !<
176	INTEGER(iwp) :: nny_z !<
177	INTEGER(iwp) :: nnz_x !<
178	INTEGER(iwp) :: nnz_y !<
179	INTEGER(iwp) :: numproc_sqr !<
180	INTEGER(iwp) :: nxl_l !<
181	INTEGER(iwp) :: nxr_l !<
182	INTEGER(iwp) :: nyn_l !<
183	INTEGER(iwp) :: nys_l !<
184	INTEGER(iwp) :: nzb_l !<
185	INTEGER(iwp) :: nzt_l !<
186	INTEGER(iwp) :: omp_get_num_threads !<
187
188	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: ind_all !<
189	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxlf !<
190	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxrf !<
191	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nynf !<
192	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nysf !<
193
194	INTEGER(iwp), DIMENSION(2) :: pdims_remote !<
195
196	#if defined( __mpi2 )
197	LOGICAL :: found !<
198	#endif
199
200	!
201	!-- Get the number of OpenMP threads
202	!$OMP PARALLEL
203	#if defined( __intel_openmp_bug )
204	threads_per_task = omp_get_num_threads()
205	#else
206	!$ threads_per_task = omp_get_num_threads()
207	#endif
208	!$OMP END PARALLEL
209
210
211	#if defined( __parallel )
212
213	CALL location_message( 'creating virtual PE grids + MPI derived data types', &
214	.FALSE. )
215
216	IF ( nested_run ) THEN
217	!
218	!-- In case of nested-domain runs, the processor grid is explicitly given
219	!-- by the user in the nestpar-NAMELIST
220	pdims(1) = cpl_npex
221	pdims(2) = cpl_npey
222
223	ELSE
224	!
225	!-- Determine the processor topology or check it, if prescribed by the user
226	IF ( npex == -1 .AND. npey == -1 ) THEN
227
228	!
229	!-- Automatic determination of the topology
230	numproc_sqr = SQRT( REAL( numprocs, KIND=wp ) )
231	pdims(1) = MAX( numproc_sqr , 1 )
232	DO WHILE ( MOD( numprocs , pdims(1) ) /= 0 )
233	pdims(1) = pdims(1) - 1
234	ENDDO
235	pdims(2) = numprocs / pdims(1)
236
237	ELSEIF ( npex /= -1 .AND. npey /= -1 ) THEN
238
239	!
240	!-- Prescribed by user. Number of processors on the prescribed topology
241	!-- must be equal to the number of PEs available to the job
242	IF ( ( npex * npey ) /= numprocs ) THEN
243	WRITE( message_string, * ) 'number of PEs of the prescribed ', &
244	'topology (', npex*npey,') does not match & the number of ', &
245	'PEs available to the job (', numprocs, ')'
246	CALL message( 'init_pegrid', 'PA0221', 1, 2, 0, 6, 0 )
247	ENDIF
248	pdims(1) = npex
249	pdims(2) = npey
250
251	ELSE
252	!
253	!-- If the processor topology is prescribed by the user, the number of
254	!-- PEs must be given in both directions
255	message_string = 'if the processor topology is prescribed by th' // &
256	'e user& both values of "npex" and "npey" must be given' // &
257	' in the &NAMELIST-parameter file'
258	CALL message( 'init_pegrid', 'PA0222', 1, 2, 0, 6, 0 )
259
260	ENDIF
261
262	ENDIF
263
264
265	!
266	!-- For communication speedup, set barriers in front of collective
267	!-- communications by default on SGI-type systems
268	IF ( host(3:5) == 'sgi' ) collective_wait = .TRUE.
269
270	!
271	!-- If necessary, set horizontal boundary conditions to non-cyclic
272	IF ( bc_lr /= 'cyclic' ) cyclic(1) = .FALSE.
273	IF ( bc_ns /= 'cyclic' ) cyclic(2) = .FALSE.
274
275
276	#if ! defined( __check)
277	!
278	!-- Create the virtual processor grid
279	CALL MPI_CART_CREATE( comm_palm, ndim, pdims, cyclic, reorder, &
280	comm2d, ierr )
281	CALL MPI_COMM_RANK( comm2d, myid, ierr )
282	WRITE (myid_char,'(''_'',I6.6)') myid
283
284	CALL MPI_CART_COORDS( comm2d, myid, ndim, pcoord, ierr )
285	CALL MPI_CART_SHIFT( comm2d, 0, 1, pleft, pright, ierr )
286	CALL MPI_CART_SHIFT( comm2d, 1, 1, psouth, pnorth, ierr )
287
288	!
289	!-- Determine sub-topologies for transpositions
290	!-- Transposition from z to x:
291	remain_dims(1) = .TRUE.
292	remain_dims(2) = .FALSE.
293	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dx, ierr )
294	CALL MPI_COMM_RANK( comm1dx, myidx, ierr )
295	!
296	!-- Transposition from x to y
297	remain_dims(1) = .FALSE.
298	remain_dims(2) = .TRUE.
299	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dy, ierr )
300	CALL MPI_COMM_RANK( comm1dy, myidy, ierr )
301
302	#endif
303
304	!
305	!-- Calculate array bounds along x-direction for every PE.
306	ALLOCATE( nxlf(0:pdims(1)-1), nxrf(0:pdims(1)-1), nynf(0:pdims(2)-1), &
307	nysf(0:pdims(2)-1) )
308
309	IF ( MOD( nx+1 , pdims(1) ) /= 0 ) THEN
310	WRITE( message_string, * ) 'x-direction: gridpoint number (',nx+1,') ',&
311	'is not an& integral divisor of the number ', &
312	'processors (', pdims(1),')'
313	CALL message( 'init_pegrid', 'PA0225', 1, 2, 0, 6, 0 )
314	ELSE
315	nnx = ( nx + 1 ) / pdims(1)
316	IF ( nnx*pdims(1) - ( nx + 1) > nnx ) THEN
317	WRITE( message_string, * ) 'x-direction: nx does not match the', &
318	'requirements given by the number of PEs &used', &
319	'& please use nx = ', nx - ( pdims(1) - ( nnx*pdims(1) &
320	- ( nx + 1 ) ) ), ' instead of nx =', nx
321	CALL message( 'init_pegrid', 'PA0226', 1, 2, 0, 6, 0 )
322	ENDIF
323	ENDIF
324
325	!
326	!-- Left and right array bounds, number of gridpoints
327	DO i = 0, pdims(1)-1
328	nxlf(i) = i * nnx
329	nxrf(i) = ( i + 1 ) * nnx - 1
330	ENDDO
331
332	!
333	!-- Calculate array bounds in y-direction for every PE.
334	IF ( MOD( ny+1 , pdims(2) ) /= 0 ) THEN
335	WRITE( message_string, * ) 'y-direction: gridpoint number (',ny+1,') ', &
336	'is not an& integral divisor of the number of', &
337	'processors (', pdims(2),')'
338	CALL message( 'init_pegrid', 'PA0227', 1, 2, 0, 6, 0 )
339	ELSE
340	nny = ( ny + 1 ) / pdims(2)
341	IF ( nny*pdims(2) - ( ny + 1) > nny ) THEN
342	WRITE( message_string, * ) 'y-direction: ny does not match the', &
343	'requirements given by the number of PEs &used ', &
344	'& please use ny = ', ny - ( pdims(2) - ( nnx*pdims(2) &
345	- ( ny + 1 ) ) ), ' instead of ny =', ny
346	CALL message( 'init_pegrid', 'PA0228', 1, 2, 0, 6, 0 )
347	ENDIF
348	ENDIF
349
350	!
351	!-- South and north array bounds
352	DO j = 0, pdims(2)-1
353	nysf(j) = j * nny
354	nynf(j) = ( j + 1 ) * nny - 1
355	ENDDO
356
357	!
358	!-- Local array bounds of the respective PEs
359	nxl = nxlf(pcoord(1))
360	nxr = nxrf(pcoord(1))
361	nys = nysf(pcoord(2))
362	nyn = nynf(pcoord(2))
363	nzb = 0
364	nzt = nz
365	nnz = nz
366
367	!
368	!-- Set switches to define if the PE is situated at the border of the virtual
369	!-- processor grid
370	IF ( nxl == 0 ) left_border_pe = .TRUE.
371	IF ( nxr == nx ) right_border_pe = .TRUE.
372	IF ( nys == 0 ) south_border_pe = .TRUE.
373	IF ( nyn == ny ) north_border_pe = .TRUE.
374
375	!
376	!-- Calculate array bounds and gridpoint numbers for the transposed arrays
377	!-- (needed in the pressure solver)
378	!-- For the transposed arrays, cyclic boundaries as well as top and bottom
379	!-- boundaries are omitted, because they are obstructive to the transposition
380
381	!
382	!-- 1. transposition z --> x
383	!-- This transposition is not neccessary in case of a 1d-decomposition along x
384	nys_x = nys
385	nyn_x = nyn
386	nny_x = nny
387	nnz_x = nz / pdims(1)
388	nzb_x = 1 + myidx * nnz_x
389	nzt_x = ( myidx + 1 ) * nnz_x
390	sendrecvcount_zx = nnx * nny * nnz_x
391
392	IF ( pdims(2) /= 1 ) THEN
393	IF ( MOD( nz , pdims(1) ) /= 0 ) THEN
394	WRITE( message_string, * ) 'transposition z --> x:', &
395	'&nz=',nz,' is not an integral divisior of pdims(1)=', &
396	pdims(1)
397	CALL message( 'init_pegrid', 'PA0230', 1, 2, 0, 6, 0 )
398	ENDIF
399	ENDIF
400
401	!
402	!-- 2. transposition x --> y
403	nnz_y = nnz_x
404	nzb_y = nzb_x
405	nzt_y = nzt_x
406	IF ( MOD( nx+1 , pdims(2) ) /= 0 ) THEN
407	WRITE( message_string, * ) 'transposition x --> y:', &
408	'&nx+1=',nx+1,' is not an integral divisor of ',&
409	'pdims(2)=',pdims(2)
410	CALL message( 'init_pegrid', 'PA0231', 1, 2, 0, 6, 0 )
411	ENDIF
412	nnx_y = (nx+1) / pdims(2)
413	nxl_y = myidy * nnx_y
414	nxr_y = ( myidy + 1 ) * nnx_y - 1
415	sendrecvcount_xy = nnx_y * nny_x * nnz_y
416
417	!
418	!-- 3. transposition y --> z (ELSE: x --> y in case of 1D-decomposition
419	!-- along x)
420	nnx_z = nnx_y
421	nxl_z = nxl_y
422	nxr_z = nxr_y
423	nny_z = (ny+1) / pdims(1)
424	nys_z = myidx * nny_z
425	nyn_z = ( myidx + 1 ) * nny_z - 1
426	sendrecvcount_yz = nnx_y * nny_z * nnz_y
427
428	IF ( pdims(2) /= 1 ) THEN
429	!
430	!-- y --> z
431	!-- This transposition is not neccessary in case of a 1d-decomposition
432	!-- along x, except that the uptream-spline method is switched on
433	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
434	WRITE( message_string, * ) 'transposition y --> z:', &
435	'& ny+1=',ny+1,' is not an integral divisor of ',&
436	'pdims(1)=',pdims(1)
437	CALL message( 'init_pegrid', 'PA0232', 1, 2, 0, 6, 0 )
438	ENDIF
439
440	ELSE
441	!
442	!-- x --> y. This condition must be fulfilled for a 1D-decomposition along x
443	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
444	WRITE( message_string, * ) 'transposition x --> y:', &
445	'& ny+1=',ny+1,' is not an integral divisor of ',&
446	'pdims(1)=',pdims(1)
447	CALL message( 'init_pegrid', 'PA0233', 1, 2, 0, 6, 0 )
448	ENDIF
449
450	ENDIF
451
452	!
453	!-- Indices for direct transpositions z --> y (used for calculating spectra)
454	IF ( dt_dosp /= 9999999.9_wp ) THEN
455	IF ( MOD( nz, pdims(2) ) /= 0 ) THEN
456	WRITE( message_string, * ) 'direct transposition z --> y (needed ', &
457	'for spectra):& nz=',nz,' is not an integral divisor of ',&
458	'pdims(2)=',pdims(2)
459	CALL message( 'init_pegrid', 'PA0234', 1, 2, 0, 6, 0 )
460	ELSE
461	nxl_yd = nxl
462	nxr_yd = nxr
463	nzb_yd = 1 + myidy * ( nz / pdims(2) )
464	nzt_yd = ( myidy + 1 ) * ( nz / pdims(2) )
465	sendrecvcount_zyd = nnx * nny * ( nz / pdims(2) )
466	ENDIF
467	ENDIF
468
469	!
470	!-- Indices for direct transpositions y --> x (they are only possible in case
471	!-- of a 1d-decomposition along x)
472	IF ( pdims(2) == 1 ) THEN
473	nny_x = nny / pdims(1)
474	nys_x = myid * nny_x
475	nyn_x = ( myid + 1 ) * nny_x - 1
476	nzb_x = 1
477	nzt_x = nz
478	sendrecvcount_xy = nnx * nny_x * nz
479	ENDIF
480
481	!
482	!-- Indices for direct transpositions x --> y (they are only possible in case
483	!-- of a 1d-decomposition along y)
484	IF ( pdims(1) == 1 ) THEN
485	nnx_y = nnx / pdims(2)
486	nxl_y = myid * nnx_y
487	nxr_y = ( myid + 1 ) * nnx_y - 1
488	nzb_y = 1
489	nzt_y = nz
490	sendrecvcount_xy = nnx_y * nny * nz
491	ENDIF
492
493	!
494	!-- Arrays for storing the array bounds are needed any more
495	DEALLOCATE( nxlf , nxrf , nynf , nysf )
496
497
498	#if ! defined( __check)
499	!
500	!-- Collect index bounds from other PEs (to be written to restart file later)
501	ALLOCATE( hor_index_bounds(4,0:numprocs-1) )
502
503	IF ( myid == 0 ) THEN
504
505	hor_index_bounds(1,0) = nxl
506	hor_index_bounds(2,0) = nxr
507	hor_index_bounds(3,0) = nys
508	hor_index_bounds(4,0) = nyn
509
510	!
511	!-- Receive data from all other PEs
512	DO i = 1, numprocs-1
513	CALL MPI_RECV( ibuf, 4, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
514	ierr )
515	hor_index_bounds(:,i) = ibuf(1:4)
516	ENDDO
517
518	ELSE
519	!
520	!-- Send index bounds to PE0
521	ibuf(1) = nxl
522	ibuf(2) = nxr
523	ibuf(3) = nys
524	ibuf(4) = nyn
525	CALL MPI_SEND( ibuf, 4, MPI_INTEGER, 0, myid, comm2d, ierr )
526
527	ENDIF
528
529	#endif
530
531	#if defined( __print )
532	!
533	!-- Control output
534	IF ( myid == 0 ) THEN
535	PRINT, ' processor topology *'
536	PRINT*, ' '
537	PRINT*, 'myid pcoord left right south north idx idy nxl: nxr',&
538	&' nys: nyn'
539	PRINT*, '------------------------------------------------------------',&
540	&'-----------'
541	WRITE (*,1000) 0, pcoord(1), pcoord(2), pleft, pright, psouth, pnorth, &
542	myidx, myidy, nxl, nxr, nys, nyn
543	1000 FORMAT (I4,2X,'(',I3,',',I3,')',3X,I4,2X,I4,3X,I4,2X,I4,2X,I3,1X,I3, &
544	2(2X,I4,':',I4))
545
546	!
547	!-- Receive data from the other PEs
548	DO i = 1,numprocs-1
549	CALL MPI_RECV( ibuf, 12, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
550	ierr )
551	WRITE (*,1000) i, ( ibuf(j) , j = 1,12 )
552	ENDDO
553	ELSE
554
555	!
556	!-- Send data to PE0
557	ibuf(1) = pcoord(1); ibuf(2) = pcoord(2); ibuf(3) = pleft
558	ibuf(4) = pright; ibuf(5) = psouth; ibuf(6) = pnorth; ibuf(7) = myidx
559	ibuf(8) = myidy; ibuf(9) = nxl; ibuf(10) = nxr; ibuf(11) = nys
560	ibuf(12) = nyn
561	CALL MPI_SEND( ibuf, 12, MPI_INTEGER, 0, myid, comm2d, ierr )
562	ENDIF
563	#endif
564
565	#if defined( __parallel ) && ! defined( __check)
566	#if defined( __mpi2 )
567	!
568	!-- In case of coupled runs, get the port name on PE0 of the atmosphere model
569	!-- and pass it to PE0 of the ocean model
570	IF ( myid == 0 ) THEN
571
572	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
573
574	CALL MPI_OPEN_PORT( MPI_INFO_NULL, port_name, ierr )
575
576	CALL MPI_PUBLISH_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, &
577	ierr )
578
579	!
580	!-- Write a flag file for the ocean model and the other atmosphere
581	!-- processes.
582	!-- There seems to be a bug in MPICH2 which causes hanging processes
583	!-- in case that execution of LOOKUP_NAME is continued too early
584	!-- (i.e. before the port has been created)
585	OPEN( 90, FILE='COUPLING_PORT_OPENED', FORM='FORMATTED' )
586	WRITE ( 90, '(''TRUE'')' )
587	CLOSE ( 90 )
588
589	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
590
591	!
592	!-- Continue only if the atmosphere model has created the port.
593	!-- There seems to be a bug in MPICH2 which causes hanging processes
594	!-- in case that execution of LOOKUP_NAME is continued too early
595	!-- (i.e. before the port has been created)
596	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
597	DO WHILE ( .NOT. found )
598	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
599	ENDDO
600
601	CALL MPI_LOOKUP_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, ierr )
602
603	ENDIF
604
605	ENDIF
606
607	!
608	!-- In case of coupled runs, establish the connection between the atmosphere
609	!-- and the ocean model and define the intercommunicator (comm_inter)
610	CALL MPI_BARRIER( comm2d, ierr )
611	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
612
613	CALL MPI_COMM_ACCEPT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
614	comm_inter, ierr )
615	coupling_mode_remote = 'ocean_to_atmosphere'
616
617	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
618
619	CALL MPI_COMM_CONNECT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
620	comm_inter, ierr )
621	coupling_mode_remote = 'atmosphere_to_ocean'
622
623	ENDIF
624	#endif
625
626	!
627	!-- Determine the number of ghost point layers
628	IF ( ( scalar_advec == 'ws-scheme' .AND. .NOT. neutral ) .OR. &
629	scalar_advec == 'ws-scheme-mono' .OR. &
630	momentum_advec == 'ws-scheme' ) THEN
631	nbgp = 3
632	ELSE
633	nbgp = 1
634	ENDIF
635
636	!
637	!-- Create a new MPI derived datatype for the exchange of surface (xy) data,
638	!-- which is needed for coupled atmosphere-ocean runs.
639	!-- First, calculate number of grid points of an xy-plane.
640	ngp_xy = ( nxr - nxl + 1 + 2 * nbgp ) * ( nyn - nys + 1 + 2 * nbgp )
641	CALL MPI_TYPE_VECTOR( ngp_xy, 1, nzt-nzb+2, MPI_REAL, type_xy, ierr )
642	CALL MPI_TYPE_COMMIT( type_xy, ierr )
643
644	IF ( TRIM( coupling_mode ) /= 'uncoupled' ) THEN
645
646	!
647	!-- Pass the number of grid points of the atmosphere model to
648	!-- the ocean model and vice versa
649	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
650
651	nx_a = nx
652	ny_a = ny
653
654	IF ( myid == 0 ) THEN
655
656	CALL MPI_SEND( nx_a, 1, MPI_INTEGER, numprocs, 1, comm_inter, &
657	ierr )
658	CALL MPI_SEND( ny_a, 1, MPI_INTEGER, numprocs, 2, comm_inter, &
659	ierr )
660	CALL MPI_SEND( pdims, 2, MPI_INTEGER, numprocs, 3, comm_inter, &
661	ierr )
662	CALL MPI_RECV( nx_o, 1, MPI_INTEGER, numprocs, 4, comm_inter, &
663	status, ierr )
664	CALL MPI_RECV( ny_o, 1, MPI_INTEGER, numprocs, 5, comm_inter, &
665	status, ierr )
666	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, numprocs, 6, &
667	comm_inter, status, ierr )
668	ENDIF
669
670	CALL MPI_BCAST( nx_o, 1, MPI_INTEGER, 0, comm2d, ierr )
671	CALL MPI_BCAST( ny_o, 1, MPI_INTEGER, 0, comm2d, ierr )
672	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr )
673
674	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
675
676	nx_o = nx
677	ny_o = ny
678
679	IF ( myid == 0 ) THEN
680
681	CALL MPI_RECV( nx_a, 1, MPI_INTEGER, 0, 1, comm_inter, status, &
682	ierr )
683	CALL MPI_RECV( ny_a, 1, MPI_INTEGER, 0, 2, comm_inter, status, &
684	ierr )
685	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, 0, 3, comm_inter, &
686	status, ierr )
687	CALL MPI_SEND( nx_o, 1, MPI_INTEGER, 0, 4, comm_inter, ierr )
688	CALL MPI_SEND( ny_o, 1, MPI_INTEGER, 0, 5, comm_inter, ierr )
689	CALL MPI_SEND( pdims, 2, MPI_INTEGER, 0, 6, comm_inter, ierr )
690	ENDIF
691
692	CALL MPI_BCAST( nx_a, 1, MPI_INTEGER, 0, comm2d, ierr)
693	CALL MPI_BCAST( ny_a, 1, MPI_INTEGER, 0, comm2d, ierr)
694	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr)
695
696	ENDIF
697
698	ngp_a = ( nx_a+1 + 2 * nbgp ) * ( ny_a+1 + 2 * nbgp )
699	ngp_o = ( nx_o+1 + 2 * nbgp ) * ( ny_o+1 + 2 * nbgp )
700
701	!
702	!-- Determine if the horizontal grid and the number of PEs in ocean and
703	!-- atmosphere is same or not
704	IF ( nx_o == nx_a .AND. ny_o == ny_a .AND. &
705	pdims(1) == pdims_remote(1) .AND. pdims(2) == pdims_remote(2) ) &
706	THEN
707	coupling_topology = 0
708	ELSE
709	coupling_topology = 1
710	ENDIF
711
712	!
713	!-- Determine the target PEs for the exchange between ocean and
714	!-- atmosphere (comm2d)
715	IF ( coupling_topology == 0 ) THEN
716	!
717	!-- In case of identical topologies, every atmosphere PE has exactly one
718	!-- ocean PE counterpart and vice versa
719	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
720	target_id = myid + numprocs
721	ELSE
722	target_id = myid
723	ENDIF
724
725	ELSE
726	!
727	!-- In case of nonequivalent topology in ocean and atmosphere only for
728	!-- PE0 in ocean and PE0 in atmosphere a target_id is needed, since
729	!-- data echxchange between ocean and atmosphere will be done only
730	!-- between these PEs.
731	IF ( myid == 0 ) THEN
732
733	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
734	target_id = numprocs
735	ELSE
736	target_id = 0
737	ENDIF
738
739	ENDIF
740
741	ENDIF
742
743	ENDIF
744
745
746	#endif
747
748	#else
749
750	!
751	!-- Array bounds when running on a single PE (respectively a non-parallel
752	!-- machine)
753	nxl = 0
754	nxr = nx
755	nnx = nxr - nxl + 1
756	nys = 0
757	nyn = ny
758	nny = nyn - nys + 1
759	nzb = 0
760	nzt = nz
761	nnz = nz
762
763	ALLOCATE( hor_index_bounds(4,0:0) )
764	hor_index_bounds(1,0) = nxl
765	hor_index_bounds(2,0) = nxr
766	hor_index_bounds(3,0) = nys
767	hor_index_bounds(4,0) = nyn
768
769	!
770	!-- Array bounds for the pressure solver (in the parallel code, these bounds
771	!-- are the ones for the transposed arrays)
772	nys_x = nys
773	nyn_x = nyn
774	nzb_x = nzb + 1
775	nzt_x = nzt
776
777	nxl_y = nxl
778	nxr_y = nxr
779	nzb_y = nzb + 1
780	nzt_y = nzt
781
782	nxl_z = nxl
783	nxr_z = nxr
784	nys_z = nys
785	nyn_z = nyn
786
787	#endif
788
789	!
790	!-- Calculate number of grid levels necessary for the multigrid poisson solver
791	!-- as well as the gridpoint indices on each level
792	IF ( psolver(1:9) == 'multigrid' ) THEN
793
794	!
795	!-- First calculate number of possible grid levels for the subdomains
796	mg_levels_x = 1
797	mg_levels_y = 1
798	mg_levels_z = 1
799
800	i = nnx
801	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
802	i = i / 2
803	mg_levels_x = mg_levels_x + 1
804	ENDDO
805
806	j = nny
807	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
808	j = j / 2
809	mg_levels_y = mg_levels_y + 1
810	ENDDO
811
812	k = nz ! do not use nnz because it might be > nz due to transposition
813	! requirements
814	DO WHILE ( MOD( k, 2 ) == 0 .AND. k /= 2 )
815	k = k / 2
816	mg_levels_z = mg_levels_z + 1
817	ENDDO
818
819	maximum_grid_level = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
820
821	!
822	!-- Find out, if the total domain allows more levels. These additional
823	!-- levels are identically processed on all PEs.
824	IF ( numprocs > 1 .AND. mg_switch_to_pe0_level /= -1 ) THEN
825
826	IF ( mg_levels_z > MIN( mg_levels_x, mg_levels_y ) ) THEN
827
828	mg_switch_to_pe0_level_l = maximum_grid_level
829
830	mg_levels_x = 1
831	mg_levels_y = 1
832
833	i = nx+1
834	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
835	i = i / 2
836	mg_levels_x = mg_levels_x + 1
837	ENDDO
838
839	j = ny+1
840	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
841	j = j / 2
842	mg_levels_y = mg_levels_y + 1
843	ENDDO
844
845	maximum_grid_level_l = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
846
847	IF ( maximum_grid_level_l > mg_switch_to_pe0_level_l ) THEN
848	mg_switch_to_pe0_level_l = maximum_grid_level_l - &
849	mg_switch_to_pe0_level_l + 1
850	ELSE
851	mg_switch_to_pe0_level_l = 0
852	ENDIF
853
854	ELSE
855	mg_switch_to_pe0_level_l = 0
856	maximum_grid_level_l = maximum_grid_level
857
858	ENDIF
859
860	!
861	!-- Use switch level calculated above only if it is not pre-defined
862	!-- by user
863	IF ( mg_switch_to_pe0_level == 0 ) THEN
864	IF ( mg_switch_to_pe0_level_l /= 0 ) THEN
865	mg_switch_to_pe0_level = mg_switch_to_pe0_level_l
866	maximum_grid_level = maximum_grid_level_l
867	ENDIF
868
869	ELSE
870	!
871	!-- Check pre-defined value and reset to default, if neccessary
872	IF ( mg_switch_to_pe0_level < mg_switch_to_pe0_level_l .OR. &
873	mg_switch_to_pe0_level >= maximum_grid_level_l ) THEN
874	message_string = 'mg_switch_to_pe0_level ' // &
875	'out of range and reset to default (=0)'
876	CALL message( 'init_pegrid', 'PA0235', 0, 1, 0, 6, 0 )
877	mg_switch_to_pe0_level = 0
878	ELSE
879	!
880	!-- Use the largest number of possible levels anyway and recalculate
881	!-- the switch level to this largest number of possible values
882	maximum_grid_level = maximum_grid_level_l
883
884	ENDIF
885
886	ENDIF
887
888	ENDIF
889
890	ALLOCATE( grid_level_count(maximum_grid_level), &
891	nxl_mg(0:maximum_grid_level), nxr_mg(0:maximum_grid_level), &
892	nyn_mg(0:maximum_grid_level), nys_mg(0:maximum_grid_level), &
893	nzt_mg(0:maximum_grid_level) )
894
895	grid_level_count = 0
896	!
897	!-- Index zero required as dummy due to definition of arrays f2 and p2 in
898	!-- recursive subroutine next_mg_level
899	nxl_mg(0) = 0; nxr_mg(0) = 0; nyn_mg(0) = 0; nys_mg(0) = 0; nzt_mg(0) = 0
900
901	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzt_l = nzt
902
903	DO i = maximum_grid_level, 1 , -1
904
905	IF ( i == mg_switch_to_pe0_level ) THEN
906	#if defined( __parallel ) && ! defined( __check )
907	!
908	!-- Save the grid size of the subdomain at the switch level, because
909	!-- it is needed in poismg.
910	ind(1) = nxl_l; ind(2) = nxr_l
911	ind(3) = nys_l; ind(4) = nyn_l
912	ind(5) = nzt_l
913	ALLOCATE( ind_all(5*numprocs), mg_loc_ind(5,0:numprocs-1) )
914	CALL MPI_ALLGATHER( ind, 5, MPI_INTEGER, ind_all, 5, &
915	MPI_INTEGER, comm2d, ierr )
916	DO j = 0, numprocs-1
917	DO k = 1, 5
918	mg_loc_ind(k,j) = ind_all(k+j*5)
919	ENDDO
920	ENDDO
921	DEALLOCATE( ind_all )
922	!
923	!-- Calculate the grid size of the total domain
924	nxr_l = ( nxr_l-nxl_l+1 ) * pdims(1) - 1
925	nxl_l = 0
926	nyn_l = ( nyn_l-nys_l+1 ) * pdims(2) - 1
927	nys_l = 0
928	!
929	!-- The size of this gathered array must not be larger than the
930	!-- array tend, which is used in the multigrid scheme as a temporary
931	!-- array. Therefore the subdomain size of an PE is calculated and
932	!-- the size of the gathered grid. These values are used in
933	!-- routines pres and poismg
934	subdomain_size = ( nxr - nxl + 2 * nbgp + 1 ) * &
935	( nyn - nys + 2 * nbgp + 1 ) * ( nzt - nzb + 2 )
936	gathered_size = ( nxr_l - nxl_l + 3 ) * ( nyn_l - nys_l + 3 ) * &
937	( nzt_l - nzb + 2 )
938
939	#elif ! defined ( __parallel )
940	message_string = 'multigrid gather/scatter impossible ' // &
941	'in non parallel mode'
942	CALL message( 'init_pegrid', 'PA0237', 1, 2, 0, 6, 0 )
943	#endif
944	ENDIF
945
946	nxl_mg(i) = nxl_l
947	nxr_mg(i) = nxr_l
948	nys_mg(i) = nys_l
949	nyn_mg(i) = nyn_l
950	nzt_mg(i) = nzt_l
951
952	nxl_l = nxl_l / 2
953	nxr_l = nxr_l / 2
954	nys_l = nys_l / 2
955	nyn_l = nyn_l / 2
956	nzt_l = nzt_l / 2
957
958	ENDDO
959
960	!
961	!-- Temporary problem: Currently calculation of maxerror iin routine poismg crashes
962	!-- if grid data are collected on PE0 already on the finest grid level.
963	!-- To be solved later.
964	IF ( maximum_grid_level == mg_switch_to_pe0_level ) THEN
965	message_string = 'grid coarsening on subdomain level cannot be performed'
966	CALL message( 'poismg', 'PA0236', 1, 2, 0, 6, 0 )
967	ENDIF
968
969	ELSE
970
971	maximum_grid_level = 0
972
973	ENDIF
974
975	!
976	!-- Default level 0 tells exchange_horiz that all ghost planes have to be
977	!-- exchanged. grid_level is adjusted in poismg, where only one ghost plane
978	!-- is required.
979	grid_level = 0
980
981	#if defined( __parallel ) && ! defined ( __check )
982	!
983	!-- Gridpoint number for the exchange of ghost points (y-line for 2D-arrays)
984	ngp_y = nyn - nys + 1 + 2 * nbgp
985
986	!
987	!-- Define new MPI derived datatypes for the exchange of ghost points in
988	!-- x- and y-direction for 2D-arrays (line)
989	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_REAL, type_x, &
990	ierr )
991	CALL MPI_TYPE_COMMIT( type_x, ierr )
992	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_INTEGER, &
993	type_x_int, ierr )
994	CALL MPI_TYPE_COMMIT( type_x_int, ierr )
995
996	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_REAL, type_y, ierr )
997	CALL MPI_TYPE_COMMIT( type_y, ierr )
998	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_INTEGER, type_y_int, ierr )
999	CALL MPI_TYPE_COMMIT( type_y_int, ierr )
1000
1001
1002	!
1003	!-- Calculate gridpoint numbers for the exchange of ghost points along x
1004	!-- (yz-plane for 3D-arrays) and define MPI derived data type(s) for the
1005	!-- exchange of ghost points in y-direction (xz-plane).
1006	!-- Do these calculations for the model grid and (if necessary) also
1007	!-- for the coarser grid levels used in the multigrid method
1008	ALLOCATE ( ngp_xz(0:maximum_grid_level), ngp_yz(0:maximum_grid_level), &
1009	type_xz(0:maximum_grid_level), type_yz(0:maximum_grid_level) )
1010
1011	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzb_l = nzb; nzt_l = nzt
1012
1013	!
1014	!-- Discern between the model grid, which needs nbgp ghost points and
1015	!-- grid levels for the multigrid scheme. In the latter case only one
1016	!-- ghost point is necessary.
1017	!-- First definition of MPI-datatypes for exchange of ghost layers on normal
1018	!-- grid. The following loop is needed for data exchange in poismg.f90.
1019	!
1020	!-- Determine number of grid points of yz-layer for exchange
1021	ngp_yz(0) = (nzt - nzb + 2) * (nyn - nys + 1 + 2 * nbgp)
1022
1023	!
1024	!-- Define an MPI-datatype for the exchange of left/right boundaries.
1025	!-- Although data are contiguous in physical memory (which does not
1026	!-- necessarily require an MPI-derived datatype), the data exchange between
1027	!-- left and right PE's using the MPI-derived type is 10% faster than without.
1028	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2nbgp, nbgp(nzt-nzb+2), ngp_yz(0), &
1029	MPI_REAL, type_xz(0), ierr )
1030	CALL MPI_TYPE_COMMIT( type_xz(0), ierr )
1031
1032	CALL MPI_TYPE_VECTOR( nbgp, ngp_yz(0), ngp_yz(0), MPI_REAL, type_yz(0), &
1033	ierr )
1034	CALL MPI_TYPE_COMMIT( type_yz(0), ierr )
1035
1036	!
1037	!-- Definition of MPI-datatypes for multigrid method (coarser level grids)
1038	IF ( psolver(1:9) == 'multigrid' ) THEN
1039	!
1040	!-- Definition of MPI-datatyoe as above, but only 1 ghost level is used
1041	DO i = maximum_grid_level, 1 , -1
1042
1043	ngp_xz(i) = (nzt_l - nzb_l + 2) * (nxr_l - nxl_l + 3)
1044	ngp_yz(i) = (nzt_l - nzb_l + 2) * (nyn_l - nys_l + 3)
1045
1046	CALL MPI_TYPE_VECTOR( nxr_l-nxl_l+3, nzt_l-nzb_l+2, ngp_yz(i), &
1047	MPI_REAL, type_xz(i), ierr )
1048	CALL MPI_TYPE_COMMIT( type_xz(i), ierr )
1049
1050	CALL MPI_TYPE_VECTOR( 1, ngp_yz(i), ngp_yz(i), MPI_REAL, type_yz(i), &
1051	ierr )
1052	CALL MPI_TYPE_COMMIT( type_yz(i), ierr )
1053
1054	nxl_l = nxl_l / 2
1055	nxr_l = nxr_l / 2
1056	nys_l = nys_l / 2
1057	nyn_l = nyn_l / 2
1058	nzt_l = nzt_l / 2
1059
1060	ENDDO
1061
1062	ENDIF
1063	!
1064	!-- Define data types for exchange of 3D Integer arrays.
1065	ngp_yz_int = (nzt - nzb + 2) * (nyn - nys + 1 + 2 * nbgp)
1066
1067	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2nbgp, nbgp(nzt-nzb+2), ngp_yz_int, &
1068	MPI_INTEGER, type_xz_int, ierr )
1069	CALL MPI_TYPE_COMMIT( type_xz_int, ierr )
1070
1071	CALL MPI_TYPE_VECTOR( nbgp, ngp_yz_int, ngp_yz_int, MPI_INTEGER, type_yz_int, &
1072	ierr )
1073	CALL MPI_TYPE_COMMIT( type_yz_int, ierr )
1074
1075	#endif
1076
1077	#if defined( __parallel ) && ! defined ( __check )
1078	!
1079	!-- Setting of flags for inflow/outflow/nesting conditions in case of non-cyclic
1080	!-- horizontal boundary conditions.
1081	IF ( pleft == MPI_PROC_NULL ) THEN
1082	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1083	inflow_l = .TRUE.
1084	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1085	outflow_l = .TRUE.
1086	ELSEIF ( bc_lr == 'nested' ) THEN
1087	nest_bound_l = .TRUE.
1088	ENDIF
1089	ENDIF
1090
1091	IF ( pright == MPI_PROC_NULL ) THEN
1092	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1093	outflow_r = .TRUE.
1094	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1095	inflow_r = .TRUE.
1096	ELSEIF ( bc_lr == 'nested' ) THEN
1097	nest_bound_r = .TRUE.
1098	ENDIF
1099	ENDIF
1100
1101	IF ( psouth == MPI_PROC_NULL ) THEN
1102	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1103	outflow_s = .TRUE.
1104	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1105	inflow_s = .TRUE.
1106	ELSEIF ( bc_ns == 'nested' ) THEN
1107	nest_bound_s = .TRUE.
1108	ENDIF
1109	ENDIF
1110
1111	IF ( pnorth == MPI_PROC_NULL ) THEN
1112	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1113	inflow_n = .TRUE.
1114	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1115	outflow_n = .TRUE.
1116	ELSEIF ( bc_ns == 'nested' ) THEN
1117	nest_bound_n = .TRUE.
1118	ENDIF
1119	ENDIF
1120
1121	!
1122	!-- Broadcast the id of the inflow PE
1123	IF ( inflow_l ) THEN
1124	id_inflow_l = myidx
1125	ELSE
1126	id_inflow_l = 0
1127	ENDIF
1128	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1129	CALL MPI_ALLREDUCE( id_inflow_l, id_inflow, 1, MPI_INTEGER, MPI_SUM, &
1130	comm1dx, ierr )
1131
1132	!
1133	!-- Broadcast the id of the recycling plane
1134	!-- WARNING: needs to be adjusted in case of inflows other than from left side!
1135	IF ( NINT( recycling_width / dx ) >= nxl .AND. &
1136	NINT( recycling_width / dx ) <= nxr ) THEN
1137	id_recycling_l = myidx
1138	ELSE
1139	id_recycling_l = 0
1140	ENDIF
1141	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1142	CALL MPI_ALLREDUCE( id_recycling_l, id_recycling, 1, MPI_INTEGER, MPI_SUM, &
1143	comm1dx, ierr )
1144
1145	CALL location_message( 'finished', .TRUE. )
1146
1147	#elif ! defined ( __parallel )
1148	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1149	inflow_l = .TRUE.
1150	outflow_r = .TRUE.
1151	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1152	outflow_l = .TRUE.
1153	inflow_r = .TRUE.
1154	ENDIF
1155
1156	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1157	inflow_n = .TRUE.
1158	outflow_s = .TRUE.
1159	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1160	outflow_n = .TRUE.
1161	inflow_s = .TRUE.
1162	ENDIF
1163	#endif
1164
1165	!
1166	!-- At the inflow or outflow, u or v, respectively, have to be calculated for
1167	!-- one more grid point.
1168	IF ( inflow_l .OR. outflow_l .OR. nest_bound_l ) THEN
1169	nxlu = nxl + 1
1170	ELSE
1171	nxlu = nxl
1172	ENDIF
1173	IF ( inflow_s .OR. outflow_s .OR. nest_bound_s ) THEN
1174	nysv = nys + 1
1175	ELSE
1176	nysv = nys
1177	ENDIF
1178
1179	!
1180	!-- Allocate wall flag arrays used in the multigrid solver
1181	IF ( psolver(1:9) == 'multigrid' ) THEN
1182
1183	DO i = maximum_grid_level, 1, -1
1184
1185	SELECT CASE ( i )
1186
1187	CASE ( 1 )
1188	ALLOCATE( wall_flags_1(nzb:nzt_mg(i)+1, &
1189	nys_mg(i)-1:nyn_mg(i)+1, &
1190	nxl_mg(i)-1:nxr_mg(i)+1) )
1191
1192	CASE ( 2 )
1193	ALLOCATE( wall_flags_2(nzb:nzt_mg(i)+1, &
1194	nys_mg(i)-1:nyn_mg(i)+1, &
1195	nxl_mg(i)-1:nxr_mg(i)+1) )
1196
1197	CASE ( 3 )
1198	ALLOCATE( wall_flags_3(nzb:nzt_mg(i)+1, &
1199	nys_mg(i)-1:nyn_mg(i)+1, &
1200	nxl_mg(i)-1:nxr_mg(i)+1) )
1201
1202	CASE ( 4 )
1203	ALLOCATE( wall_flags_4(nzb:nzt_mg(i)+1, &
1204	nys_mg(i)-1:nyn_mg(i)+1, &
1205	nxl_mg(i)-1:nxr_mg(i)+1) )
1206
1207	CASE ( 5 )
1208	ALLOCATE( wall_flags_5(nzb:nzt_mg(i)+1, &
1209	nys_mg(i)-1:nyn_mg(i)+1, &
1210	nxl_mg(i)-1:nxr_mg(i)+1) )
1211
1212	CASE ( 6 )
1213	ALLOCATE( wall_flags_6(nzb:nzt_mg(i)+1, &
1214	nys_mg(i)-1:nyn_mg(i)+1, &
1215	nxl_mg(i)-1:nxr_mg(i)+1) )
1216
1217	CASE ( 7 )
1218	ALLOCATE( wall_flags_7(nzb:nzt_mg(i)+1, &
1219	nys_mg(i)-1:nyn_mg(i)+1, &
1220	nxl_mg(i)-1:nxr_mg(i)+1) )
1221
1222	CASE ( 8 )
1223	ALLOCATE( wall_flags_8(nzb:nzt_mg(i)+1, &
1224	nys_mg(i)-1:nyn_mg(i)+1, &
1225	nxl_mg(i)-1:nxr_mg(i)+1) )
1226
1227	CASE ( 9 )
1228	ALLOCATE( wall_flags_9(nzb:nzt_mg(i)+1, &
1229	nys_mg(i)-1:nyn_mg(i)+1, &
1230	nxl_mg(i)-1:nxr_mg(i)+1) )
1231
1232	CASE ( 10 )
1233	ALLOCATE( wall_flags_10(nzb:nzt_mg(i)+1, &
1234	nys_mg(i)-1:nyn_mg(i)+1, &
1235	nxl_mg(i)-1:nxr_mg(i)+1) )
1236
1237	CASE DEFAULT
1238	message_string = 'more than 10 multigrid levels'
1239	CALL message( 'init_pegrid', 'PA0238', 1, 2, 0, 6, 0 )
1240
1241	END SELECT
1242
1243	ENDDO
1244
1245	ENDIF
1246
1247	!
1248	!-- Calculate the number of groups into which parallel I/O is split.
1249	!-- The default for files which are opened by all PEs (or where each
1250	!-- PE opens his own independent file) is, that all PEs are doing input/output
1251	!-- in parallel at the same time. This might cause performance or even more
1252	!-- severe problems depending on the configuration of the underlying file
1253	!-- system.
1254	!-- First, set the default:
1255	IF ( maximum_parallel_io_streams == -1 .OR. &
1256	maximum_parallel_io_streams > numprocs ) THEN
1257	maximum_parallel_io_streams = numprocs
1258	ENDIF
1259
1260	!
1261	!-- Now calculate the number of io_blocks and the io_group to which the
1262	!-- respective PE belongs. I/O of the groups is done in serial, but in parallel
1263	!-- for all PEs belonging to the same group. A preliminary setting with myid
1264	!-- based on MPI_COMM_WORLD has been done in parin.
1265	io_blocks = numprocs / maximum_parallel_io_streams
1266	io_group = MOD( myid+1, io_blocks )
1267
1268
1269	END SUBROUTINE init_pegrid

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