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source: palm/trunk/SOURCE/init_pegrid.f90 @ 992

Last change on this file since 992 was 979, checked in by fricke, 12 years ago
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1	SUBROUTINE init_pegrid
2
3	!------------------------------------------------------------------------------!
4	! Current revisions:
5	! -----------------
6	!
7	!
8	! Former revisions:
9	! -----------------
10	! $Id: init_pegrid.f90 979 2012-08-09 08:50:11Z hoffmann $
11	!
12	! 978 2012-08-09 08:28:32Z fricke
13	! dirichlet/neumann and neumann/dirichlet added
14	! nxlu and nysv are also calculated for inflow boundary
15	!
16	! 809 2012-01-30 13:32:58Z maronga
17	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
18	!
19	! 807 2012-01-25 11:53:51Z maronga
20	! New cpp directive "__check" implemented which is used by check_namelist_files
21	!
22	! 780 2011-11-10 07:16:47Z raasch
23	! Bugfix for rev 778: Misplaced error message moved to the rigth place
24	!
25	! 778 2011-11-07 14:18:25Z fricke
26	! Calculation of subdomain_size now considers the number of ghost points.
27	! Further coarsening on PE0 is now possible for multigrid solver if the
28	! collected field has more grid points than the subdomain of an PE.
29	!
30	! 759 2011-09-15 13:58:31Z raasch
31	! calculation of number of io_blocks and the io_group to which the respective
32	! PE belongs
33	!
34	! 755 2011-08-29 09:55:16Z witha
35	! 2d-decomposition is default for lcflow (ForWind cluster in Oldenburg)
36	!
37	! 722 2011-04-11 06:21:09Z raasch
38	! Bugfix: bc_lr/ns_cyc/dirrad/raddir replaced by bc_lr/ns, because variables
39	! are not yet set here; grid_level set to 0
40	!
41	! 709 2011-03-30 09:31:40Z raasch
42	! formatting adjustments
43	!
44	! 707 2011-03-29 11:39:40Z raasch
45	! bc_lr/ns replaced by bc_lr/ns_cyc/dirrad/raddir
46	!
47	! 667 2010-12-23 12:06:00Z suehring/gryschka
48	! Moved determination of target_id's from init_coupling
49	! Determination of parameters needed for coupling (coupling_topology, ngp_a,
50	! ngp_o) with different grid/processor-topology in ocean and atmosphere
51	! Adaption of ngp_xy, ngp_y to a dynamic number of ghost points.
52	! The maximum_grid_level changed from 1 to 0. 0 is the normal grid, 1 to
53	! maximum_grid_level the grids for multigrid, in which 0 and 1 are normal grids.
54	! This distinction is due to reasons of data exchange and performance for the
55	! normal grid and grids in poismg.
56	! The definition of MPI-Vectors adapted to a dynamic numer of ghost points.
57	! New MPI-Vectors for data exchange between left and right boundaries added.
58	! This is due to reasons of performance (10% faster).
59	!
60	! 646 2010-12-15 13:03:52Z raasch
61	! lctit is now using a 2d decomposition by default
62	!
63	! 622 2010-12-10 08:08:13Z raasch
64	! optional barriers included in order to speed up collective operations
65	!
66	! 438 2010-02-01 04:32:43Z raasch
67	! 2d-decomposition is default for Cray-XT machines
68	!
69	! 274 2009-03-26 15:11:21Z heinze
70	! Output of messages replaced by message handling routine.
71	!
72	! 206 2008-10-13 14:59:11Z raasch
73	! Implementation of a MPI-1 coupling: added __parallel within the __mpi2 part
74	! 2d-decomposition is default on SGI-ICE systems
75	!
76	! 197 2008-09-16 15:29:03Z raasch
77	! multigrid levels are limited by subdomains if mg_switch_to_pe0_level = -1,
78	! nz is used instead nnz for calculating mg-levels
79	! Collect on PE0 horizontal index bounds from all other PEs,
80	! broadcast the id of the inflow PE (using the respective communicator)
81	!
82	! 114 2007-10-10 00:03:15Z raasch
83	! Allocation of wall flag arrays for multigrid solver
84	!
85	! 108 2007-08-24 15:10:38Z letzel
86	! Intercommunicator (comm_inter) and derived data type (type_xy) for
87	! coupled model runs created, assign coupling_mode_remote,
88	! indices nxlu and nysv are calculated (needed for non-cyclic boundary
89	! conditions)
90	!
91	! 82 2007-04-16 15:40:52Z raasch
92	! Cpp-directive lcmuk changed to intel_openmp_bug, setting of host on lcmuk by
93	! cpp-directive removed
94	!
95	! 75 2007-03-22 09:54:05Z raasch
96	! uxrp, vynp eliminated,
97	! dirichlet/neumann changed to dirichlet/radiation, etc.,
98	! poisfft_init is only called if fft-solver is switched on
99	!
100	! RCS Log replace by Id keyword, revision history cleaned up
101	!
102	! Revision 1.28 2006/04/26 13:23:32 raasch
103	! lcmuk does not understand the !$ comment so a cpp-directive is required
104	!
105	! Revision 1.1 1997/07/24 11:15:09 raasch
106	! Initial revision
107	!
108	!
109	! Description:
110	! ------------
111	! Determination of the virtual processor topology (if not prescribed by the
112	! user)and computation of the grid point number and array bounds of the local
113	! domains.
114	!------------------------------------------------------------------------------!
115
116	USE control_parameters
117	USE fft_xy
118	USE grid_variables
119	USE indices
120	USE pegrid
121	USE poisfft_mod
122	USE poisfft_hybrid_mod
123	USE statistics
124	USE transpose_indices
125
126
127
128	IMPLICIT NONE
129
130	INTEGER :: i, id_inflow_l, id_recycling_l, ind(5), j, k, &
131	maximum_grid_level_l, mg_switch_to_pe0_level_l, mg_levels_x, &
132	mg_levels_y, mg_levels_z, nnx_y, nnx_z, nny_x, nny_z, nnz_x, &
133	nnz_y, numproc_sqr, nx_total, nxl_l, nxr_l, nyn_l, nys_l, &
134	nzb_l, nzt_l, omp_get_num_threads
135
136	INTEGER, DIMENSION(:), ALLOCATABLE :: ind_all, nxlf, nxrf, nynf, nysf
137
138	INTEGER, DIMENSION(2) :: pdims_remote
139
140	LOGICAL :: found
141
142	!
143	!-- Get the number of OpenMP threads
144	!$OMP PARALLEL
145	#if defined( __intel_openmp_bug )
146	threads_per_task = omp_get_num_threads()
147	#else
148	!$ threads_per_task = omp_get_num_threads()
149	#endif
150	!$OMP END PARALLEL
151
152
153	#if defined( __parallel )
154
155	!
156	!-- Determine the processor topology or check it, if prescribed by the user
157	IF ( npex == -1 .AND. npey == -1 ) THEN
158
159	!
160	!-- Automatic determination of the topology
161	!-- The default on SMP- and cluster-hosts is a 1d-decomposition along x
162	IF ( host(1:3) == 'ibm' .OR. host(1:3) == 'nec' .OR. &
163	( host(1:2) == 'lc' .AND. host(3:5) /= 'sgi' .AND. &
164	host(3:4) /= 'xt' .AND. host(3:5) /= 'tit' .AND. &
165	host(3:6) /= 'flow' ) .OR. host(1:3) == 'dec' ) THEN
166
167	pdims(1) = numprocs
168	pdims(2) = 1
169
170	ELSE
171
172	numproc_sqr = SQRT( REAL( numprocs ) )
173	pdims(1) = MAX( numproc_sqr , 1 )
174	DO WHILE ( MOD( numprocs , pdims(1) ) /= 0 )
175	pdims(1) = pdims(1) - 1
176	ENDDO
177	pdims(2) = numprocs / pdims(1)
178
179	ENDIF
180
181	ELSEIF ( npex /= -1 .AND. npey /= -1 ) THEN
182
183	!
184	!-- Prescribed by user. Number of processors on the prescribed topology
185	!-- must be equal to the number of PEs available to the job
186	IF ( ( npex * npey ) /= numprocs ) THEN
187	WRITE( message_string, * ) 'number of PEs of the prescribed ', &
188	'topology (', npex*npey,') does not match & the number of ', &
189	'PEs available to the job (', numprocs, ')'
190	CALL message( 'init_pegrid', 'PA0221', 1, 2, 0, 6, 0 )
191	ENDIF
192	pdims(1) = npex
193	pdims(2) = npey
194
195	ELSE
196	!
197	!-- If the processor topology is prescribed by the user, the number of
198	!-- PEs must be given in both directions
199	message_string = 'if the processor topology is prescribed by the, ' // &
200	' user& both values of "npex" and "npey" must be given ' // &
201	'in the &NAMELIST-parameter file'
202	CALL message( 'init_pegrid', 'PA0222', 1, 2, 0, 6, 0 )
203
204	ENDIF
205
206	!
207	!-- The hybrid solver can only be used in case of a 1d-decomposition along x
208	IF ( pdims(2) /= 1 .AND. psolver == 'poisfft_hybrid' ) THEN
209	message_string = 'psolver = "poisfft_hybrid" can only be' // &
210	'& used in case of a 1d-decomposition along x'
211	CALL message( 'init_pegrid', 'PA0223', 1, 2, 0, 6, 0 )
212	ENDIF
213
214	!
215	!-- For communication speedup, set barriers in front of collective
216	!-- communications by default on SGI-type systems
217	IF ( host(3:5) == 'sgi' ) collective_wait = .TRUE.
218
219	!
220	!-- If necessary, set horizontal boundary conditions to non-cyclic
221	IF ( bc_lr /= 'cyclic' ) cyclic(1) = .FALSE.
222	IF ( bc_ns /= 'cyclic' ) cyclic(2) = .FALSE.
223
224
225	#if ! defined( __check)
226	!
227	!-- Create the virtual processor grid
228	CALL MPI_CART_CREATE( comm_palm, ndim, pdims, cyclic, reorder, &
229	comm2d, ierr )
230	CALL MPI_COMM_RANK( comm2d, myid, ierr )
231	WRITE (myid_char,'(''_'',I4.4)') myid
232
233	CALL MPI_CART_COORDS( comm2d, myid, ndim, pcoord, ierr )
234	CALL MPI_CART_SHIFT( comm2d, 0, 1, pleft, pright, ierr )
235	CALL MPI_CART_SHIFT( comm2d, 1, 1, psouth, pnorth, ierr )
236
237	!
238	!-- Determine sub-topologies for transpositions
239	!-- Transposition from z to x:
240	remain_dims(1) = .TRUE.
241	remain_dims(2) = .FALSE.
242	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dx, ierr )
243	CALL MPI_COMM_RANK( comm1dx, myidx, ierr )
244	!
245	!-- Transposition from x to y
246	remain_dims(1) = .FALSE.
247	remain_dims(2) = .TRUE.
248	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dy, ierr )
249	CALL MPI_COMM_RANK( comm1dy, myidy, ierr )
250
251	#endif
252
253	!
254	!-- Find a grid (used for array d) which will match the transposition demands
255	IF ( grid_matching == 'strict' ) THEN
256
257	nxa = nx; nya = ny; nza = nz
258
259	ELSE
260
261	found = .FALSE.
262	xn: DO nxa = nx, 2*nx
263	!
264	!-- Meet conditions for nx
265	IF ( MOD( nxa+1, pdims(1) ) /= 0 .OR. &
266	MOD( nxa+1, pdims(2) ) /= 0 ) CYCLE xn
267
268	yn: DO nya = ny, 2*ny
269	!
270	!-- Meet conditions for ny
271	IF ( MOD( nya+1, pdims(2) ) /= 0 .OR. &
272	MOD( nya+1, pdims(1) ) /= 0 ) CYCLE yn
273
274
275	zn: DO nza = nz, 2*nz
276	!
277	!-- Meet conditions for nz
278	IF ( ( MOD( nza, pdims(1) ) /= 0 .AND. pdims(1) /= 1 .AND. &
279	pdims(2) /= 1 ) .OR. &
280	( MOD( nza, pdims(2) ) /= 0 .AND. dt_dosp /= 9999999.9 &
281	) ) THEN
282	CYCLE zn
283	ELSE
284	found = .TRUE.
285	EXIT xn
286	ENDIF
287
288	ENDDO zn
289
290	ENDDO yn
291
292	ENDDO xn
293
294	IF ( .NOT. found ) THEN
295	message_string = 'no matching grid for transpositions found'
296	CALL message( 'init_pegrid', 'PA0224', 1, 2, 0, 6, 0 )
297	ENDIF
298
299	ENDIF
300
301	!
302	!-- Calculate array bounds in x-direction for every PE.
303	!-- The last PE along x may get less grid points than the others
304	ALLOCATE( nxlf(0:pdims(1)-1), nxrf(0:pdims(1)-1), nynf(0:pdims(2)-1), &
305	nysf(0:pdims(2)-1), nnx_pe(0:pdims(1)-1), nny_pe(0:pdims(2)-1) )
306
307	IF ( MOD( nxa+1 , pdims(1) ) /= 0 ) THEN
308	WRITE( message_string, * ) 'x-direction: gridpoint number (',nx+1,') ',&
309	'is not an& integral divisor of the number ', &
310	'processors (', pdims(1),')'
311	CALL message( 'init_pegrid', 'PA0225', 1, 2, 0, 6, 0 )
312	ELSE
313	nnx = ( nxa + 1 ) / pdims(1)
314	IF ( nnx*pdims(1) - ( nx + 1) > nnx ) THEN
315	WRITE( message_string, * ) 'x-direction: nx does not match the', &
316	'requirements given by the number of PEs &used', &
317	'& please use nx = ', nx - ( pdims(1) - ( nnx*pdims(1) &
318	- ( nx + 1 ) ) ), ' instead of nx =', nx
319	CALL message( 'init_pegrid', 'PA0226', 1, 2, 0, 6, 0 )
320	ENDIF
321	ENDIF
322
323	!
324	!-- Left and right array bounds, number of gridpoints
325	DO i = 0, pdims(1)-1
326	nxlf(i) = i * nnx
327	nxrf(i) = ( i + 1 ) * nnx - 1
328	nnx_pe(i) = MIN( nx, nxrf(i) ) - nxlf(i) + 1
329	ENDDO
330
331	!
332	!-- Calculate array bounds in y-direction for every PE.
333	IF ( MOD( nya+1 , pdims(2) ) /= 0 ) THEN
334	WRITE( message_string, * ) 'y-direction: gridpoint number (',ny+1,') ', &
335	'is not an& integral divisor of the number of', &
336	'processors (', pdims(2),')'
337	CALL message( 'init_pegrid', 'PA0227', 1, 2, 0, 6, 0 )
338	ELSE
339	nny = ( nya + 1 ) / pdims(2)
340	IF ( nny*pdims(2) - ( ny + 1) > nny ) THEN
341	WRITE( message_string, * ) 'y-direction: ny does not match the', &
342	'requirements given by the number of PEs &used ', &
343	'& please use ny = ', ny - ( pdims(2) - ( nnx*pdims(2) &
344	- ( ny + 1 ) ) ), ' instead of ny =', ny
345	CALL message( 'init_pegrid', 'PA0228', 1, 2, 0, 6, 0 )
346	ENDIF
347	ENDIF
348
349	!
350	!-- South and north array bounds
351	DO j = 0, pdims(2)-1
352	nysf(j) = j * nny
353	nynf(j) = ( j + 1 ) * nny - 1
354	nny_pe(j) = MIN( ny, nynf(j) ) - nysf(j) + 1
355	ENDDO
356
357	!
358	!-- Local array bounds of the respective PEs
359	nxl = nxlf(pcoord(1))
360	nxra = nxrf(pcoord(1))
361	nxr = MIN( nx, nxra )
362	nys = nysf(pcoord(2))
363	nyna = nynf(pcoord(2))
364	nyn = MIN( ny, nyna )
365	nzb = 0
366	nzta = nza
367	nzt = MIN( nz, nzta )
368	nnz = nza
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	!-- except that the uptream-spline method is switched on
388	IF ( pdims(2) /= 1 .OR. momentum_advec == 'ups-scheme' .OR. &
389	scalar_advec == 'ups-scheme' ) THEN
390
391	IF ( pdims(2) == 1 .AND. ( momentum_advec == 'ups-scheme' .OR. &
392	scalar_advec == 'ups-scheme' ) ) THEN
393	message_string = '1d-decomposition along x ' // &
394	'chosen but nz restrictions may occur' // &
395	'& since ups-scheme is activated'
396	CALL message( 'init_pegrid', 'PA0229', 0, 1, 0, 6, 0 )
397	ENDIF
398	nys_x = nys
399	nyn_xa = nyna
400	nyn_x = nyn
401	nny_x = nny
402	IF ( MOD( nza , pdims(1) ) /= 0 ) THEN
403	WRITE( message_string, * ) 'transposition z --> x:', &
404	'&nz=',nz,' is not an integral divisior of pdims(1)=', &
405	pdims(1)
406	CALL message( 'init_pegrid', 'PA0230', 1, 2, 0, 6, 0 )
407	ENDIF
408	nnz_x = nza / pdims(1)
409	nzb_x = 1 + myidx * nnz_x
410	nzt_xa = ( myidx + 1 ) * nnz_x
411	nzt_x = MIN( nzt, nzt_xa )
412
413	sendrecvcount_zx = nnx * nny * nnz_x
414
415	ELSE
416	!
417	!--- Setting of dummy values because otherwise variables are undefined in
418	!--- the next step x --> y
419	!--- WARNING: This case has still to be clarified!!!!!!!!!!!!
420	nnz_x = 1
421	nzb_x = 1
422	nzt_xa = 1
423	nzt_x = 1
424	nny_x = nny
425
426	ENDIF
427
428	!
429	!-- 2. transposition x --> y
430	nnz_y = nnz_x
431	nzb_y = nzb_x
432	nzt_ya = nzt_xa
433	nzt_y = nzt_x
434	IF ( MOD( nxa+1 , pdims(2) ) /= 0 ) THEN
435	WRITE( message_string, * ) 'transposition x --> y:', &
436	'&nx+1=',nx+1,' is not an integral divisor of ',&
437	'pdims(2)=',pdims(2)
438	CALL message( 'init_pegrid', 'PA0231', 1, 2, 0, 6, 0 )
439	ENDIF
440	nnx_y = (nxa+1) / pdims(2)
441	nxl_y = myidy * nnx_y
442	nxr_ya = ( myidy + 1 ) * nnx_y - 1
443	nxr_y = MIN( nx, nxr_ya )
444
445	sendrecvcount_xy = nnx_y * nny_x * nnz_y
446
447	!
448	!-- 3. transposition y --> z (ELSE: x --> y in case of 1D-decomposition
449	!-- along x)
450	IF ( pdims(2) /= 1 .OR. momentum_advec == 'ups-scheme' .OR. &
451	scalar_advec == 'ups-scheme' ) THEN
452	!
453	!-- y --> z
454	!-- This transposition is not neccessary in case of a 1d-decomposition
455	!-- along x, except that the uptream-spline method is switched on
456	nnx_z = nnx_y
457	nxl_z = nxl_y
458	nxr_za = nxr_ya
459	nxr_z = nxr_y
460	IF ( MOD( nya+1 , pdims(1) ) /= 0 ) THEN
461	WRITE( message_string, * ) 'transposition y --> z:', &
462	'& ny+1=',ny+1,' is not an integral divisor of ',&
463	'pdims(1)=',pdims(1)
464	CALL message( 'init_pegrid', 'PA0232', 1, 2, 0, 6, 0 )
465	ENDIF
466	nny_z = (nya+1) / pdims(1)
467	nys_z = myidx * nny_z
468	nyn_za = ( myidx + 1 ) * nny_z - 1
469	nyn_z = MIN( ny, nyn_za )
470
471	sendrecvcount_yz = nnx_y * nny_z * nnz_y
472
473	ELSE
474	!
475	!-- x --> y. This condition must be fulfilled for a 1D-decomposition along x
476	IF ( MOD( nya+1 , pdims(1) ) /= 0 ) THEN
477	WRITE( message_string, * ) 'transposition x --> y:', &
478	'& ny+1=',ny+1,' is not an integral divisor of ',&
479	'pdims(1)=',pdims(1)
480	CALL message( 'init_pegrid', 'PA0233', 1, 2, 0, 6, 0 )
481	ENDIF
482
483	ENDIF
484
485	!
486	!-- Indices for direct transpositions z --> y (used for calculating spectra)
487	IF ( dt_dosp /= 9999999.9 ) THEN
488	IF ( MOD( nza, pdims(2) ) /= 0 ) THEN
489	WRITE( message_string, * ) 'direct transposition z --> y (needed ', &
490	'for spectra):& nz=',nz,' is not an integral divisor of ',&
491	'pdims(2)=',pdims(2)
492	CALL message( 'init_pegrid', 'PA0234', 1, 2, 0, 6, 0 )
493	ELSE
494	nxl_yd = nxl
495	nxr_yda = nxra
496	nxr_yd = nxr
497	nzb_yd = 1 + myidy * ( nza / pdims(2) )
498	nzt_yda = ( myidy + 1 ) * ( nza / pdims(2) )
499	nzt_yd = MIN( nzt, nzt_yda )
500
501	sendrecvcount_zyd = nnx * nny * ( nza / pdims(2) )
502	ENDIF
503	ENDIF
504
505	!
506	!-- Indices for direct transpositions y --> x (they are only possible in case
507	!-- of a 1d-decomposition along x)
508	IF ( pdims(2) == 1 ) THEN
509	nny_x = nny / pdims(1)
510	nys_x = myid * nny_x
511	nyn_xa = ( myid + 1 ) * nny_x - 1
512	nyn_x = MIN( ny, nyn_xa )
513	nzb_x = 1
514	nzt_xa = nza
515	nzt_x = nz
516	sendrecvcount_xy = nnx * nny_x * nza
517	ENDIF
518
519	!
520	!-- Indices for direct transpositions x --> y (they are only possible in case
521	!-- of a 1d-decomposition along y)
522	IF ( pdims(1) == 1 ) THEN
523	nnx_y = nnx / pdims(2)
524	nxl_y = myid * nnx_y
525	nxr_ya = ( myid + 1 ) * nnx_y - 1
526	nxr_y = MIN( nx, nxr_ya )
527	nzb_y = 1
528	nzt_ya = nza
529	nzt_y = nz
530	sendrecvcount_xy = nnx_y * nny * nza
531	ENDIF
532
533	!
534	!-- Arrays for storing the array bounds are needed any more
535	DEALLOCATE( nxlf , nxrf , nynf , nysf )
536
537
538	#if ! defined( __check)
539	!
540	!-- Collect index bounds from other PEs (to be written to restart file later)
541	ALLOCATE( hor_index_bounds(4,0:numprocs-1) )
542
543	IF ( myid == 0 ) THEN
544
545	hor_index_bounds(1,0) = nxl
546	hor_index_bounds(2,0) = nxr
547	hor_index_bounds(3,0) = nys
548	hor_index_bounds(4,0) = nyn
549
550	!
551	!-- Receive data from all other PEs
552	DO i = 1, numprocs-1
553	CALL MPI_RECV( ibuf, 4, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
554	ierr )
555	hor_index_bounds(:,i) = ibuf(1:4)
556	ENDDO
557
558	ELSE
559	!
560	!-- Send index bounds to PE0
561	ibuf(1) = nxl
562	ibuf(2) = nxr
563	ibuf(3) = nys
564	ibuf(4) = nyn
565	CALL MPI_SEND( ibuf, 4, MPI_INTEGER, 0, myid, comm2d, ierr )
566
567	ENDIF
568
569	#endif
570
571	#if defined( __print )
572	!
573	!-- Control output
574	IF ( myid == 0 ) THEN
575	PRINT, ' processor topology *'
576	PRINT*, ' '
577	PRINT*, 'myid pcoord left right south north idx idy nxl: nxr',&
578	&' nys: nyn'
579	PRINT*, '------------------------------------------------------------',&
580	&'-----------'
581	WRITE (*,1000) 0, pcoord(1), pcoord(2), pleft, pright, psouth, pnorth, &
582	myidx, myidy, nxl, nxr, nys, nyn
583	1000 FORMAT (I4,2X,'(',I3,',',I3,')',3X,I4,2X,I4,3X,I4,2X,I4,2X,I3,1X,I3, &
584	2(2X,I4,':',I4))
585
586	!
587	!-- Receive data from the other PEs
588	DO i = 1,numprocs-1
589	CALL MPI_RECV( ibuf, 12, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
590	ierr )
591	WRITE (*,1000) i, ( ibuf(j) , j = 1,12 )
592	ENDDO
593	ELSE
594
595	!
596	!-- Send data to PE0
597	ibuf(1) = pcoord(1); ibuf(2) = pcoord(2); ibuf(3) = pleft
598	ibuf(4) = pright; ibuf(5) = psouth; ibuf(6) = pnorth; ibuf(7) = myidx
599	ibuf(8) = myidy; ibuf(9) = nxl; ibuf(10) = nxr; ibuf(11) = nys
600	ibuf(12) = nyn
601	CALL MPI_SEND( ibuf, 12, MPI_INTEGER, 0, myid, comm2d, ierr )
602	ENDIF
603	#endif
604
605	#if defined( __parallel ) && ! defined( __check)
606	#if defined( __mpi2 )
607	!
608	!-- In case of coupled runs, get the port name on PE0 of the atmosphere model
609	!-- and pass it to PE0 of the ocean model
610	IF ( myid == 0 ) THEN
611
612	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
613
614	CALL MPI_OPEN_PORT( MPI_INFO_NULL, port_name, ierr )
615
616	CALL MPI_PUBLISH_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, &
617	ierr )
618
619	!
620	!-- Write a flag file for the ocean model and the other atmosphere
621	!-- processes.
622	!-- There seems to be a bug in MPICH2 which causes hanging processes
623	!-- in case that execution of LOOKUP_NAME is continued too early
624	!-- (i.e. before the port has been created)
625	OPEN( 90, FILE='COUPLING_PORT_OPENED', FORM='FORMATTED' )
626	WRITE ( 90, '(''TRUE'')' )
627	CLOSE ( 90 )
628
629	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
630
631	!
632	!-- Continue only if the atmosphere model has created the port.
633	!-- There seems to be a bug in MPICH2 which causes hanging processes
634	!-- in case that execution of LOOKUP_NAME is continued too early
635	!-- (i.e. before the port has been created)
636	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
637	DO WHILE ( .NOT. found )
638	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
639	ENDDO
640
641	CALL MPI_LOOKUP_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, ierr )
642
643	ENDIF
644
645	ENDIF
646
647	!
648	!-- In case of coupled runs, establish the connection between the atmosphere
649	!-- and the ocean model and define the intercommunicator (comm_inter)
650	CALL MPI_BARRIER( comm2d, ierr )
651	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
652
653	CALL MPI_COMM_ACCEPT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
654	comm_inter, ierr )
655	coupling_mode_remote = 'ocean_to_atmosphere'
656
657	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
658
659	CALL MPI_COMM_CONNECT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
660	comm_inter, ierr )
661	coupling_mode_remote = 'atmosphere_to_ocean'
662
663	ENDIF
664	#endif
665
666	!
667	!-- Determine the number of ghost point layers
668	IF ( scalar_advec == 'ws-scheme' .OR. momentum_advec == 'ws-scheme' ) THEN
669	nbgp = 3
670	ELSE
671	nbgp = 1
672	ENDIF
673
674	!
675	!-- Create a new MPI derived datatype for the exchange of surface (xy) data,
676	!-- which is needed for coupled atmosphere-ocean runs.
677	!-- First, calculate number of grid points of an xy-plane.
678	ngp_xy = ( nxr - nxl + 1 + 2 * nbgp ) * ( nyn - nys + 1 + 2 * nbgp )
679	CALL MPI_TYPE_VECTOR( ngp_xy, 1, nzt-nzb+2, MPI_REAL, type_xy, ierr )
680	CALL MPI_TYPE_COMMIT( type_xy, ierr )
681
682	IF ( TRIM( coupling_mode ) /= 'uncoupled' ) THEN
683
684	!
685	!-- Pass the number of grid points of the atmosphere model to
686	!-- the ocean model and vice versa
687	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
688
689	nx_a = nx
690	ny_a = ny
691
692	IF ( myid == 0 ) THEN
693
694	CALL MPI_SEND( nx_a, 1, MPI_INTEGER, numprocs, 1, comm_inter, &
695	ierr )
696	CALL MPI_SEND( ny_a, 1, MPI_INTEGER, numprocs, 2, comm_inter, &
697	ierr )
698	CALL MPI_SEND( pdims, 2, MPI_INTEGER, numprocs, 3, comm_inter, &
699	ierr )
700	CALL MPI_RECV( nx_o, 1, MPI_INTEGER, numprocs, 4, comm_inter, &
701	status, ierr )
702	CALL MPI_RECV( ny_o, 1, MPI_INTEGER, numprocs, 5, comm_inter, &
703	status, ierr )
704	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, numprocs, 6, &
705	comm_inter, status, ierr )
706	ENDIF
707
708	CALL MPI_BCAST( nx_o, 1, MPI_INTEGER, 0, comm2d, ierr )
709	CALL MPI_BCAST( ny_o, 1, MPI_INTEGER, 0, comm2d, ierr )
710	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr )
711
712	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
713
714	nx_o = nx
715	ny_o = ny
716
717	IF ( myid == 0 ) THEN
718
719	CALL MPI_RECV( nx_a, 1, MPI_INTEGER, 0, 1, comm_inter, status, &
720	ierr )
721	CALL MPI_RECV( ny_a, 1, MPI_INTEGER, 0, 2, comm_inter, status, &
722	ierr )
723	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, 0, 3, comm_inter, &
724	status, ierr )
725	CALL MPI_SEND( nx_o, 1, MPI_INTEGER, 0, 4, comm_inter, ierr )
726	CALL MPI_SEND( ny_o, 1, MPI_INTEGER, 0, 5, comm_inter, ierr )
727	CALL MPI_SEND( pdims, 2, MPI_INTEGER, 0, 6, comm_inter, ierr )
728	ENDIF
729
730	CALL MPI_BCAST( nx_a, 1, MPI_INTEGER, 0, comm2d, ierr)
731	CALL MPI_BCAST( ny_a, 1, MPI_INTEGER, 0, comm2d, ierr)
732	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr)
733
734	ENDIF
735
736	ngp_a = ( nx_a+1 + 2 * nbgp ) * ( ny_a+1 + 2 * nbgp )
737	ngp_o = ( nx_o+1 + 2 * nbgp ) * ( ny_o+1 + 2 * nbgp )
738
739	!
740	!-- Determine if the horizontal grid and the number of PEs in ocean and
741	!-- atmosphere is same or not
742	IF ( nx_o == nx_a .AND. ny_o == ny_a .AND. &
743	pdims(1) == pdims_remote(1) .AND. pdims(2) == pdims_remote(2) ) &
744	THEN
745	coupling_topology = 0
746	ELSE
747	coupling_topology = 1
748	ENDIF
749
750	!
751	!-- Determine the target PEs for the exchange between ocean and
752	!-- atmosphere (comm2d)
753	IF ( coupling_topology == 0 ) THEN
754	!
755	!-- In case of identical topologies, every atmosphere PE has exactly one
756	!-- ocean PE counterpart and vice versa
757	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
758	target_id = myid + numprocs
759	ELSE
760	target_id = myid
761	ENDIF
762
763	ELSE
764	!
765	!-- In case of nonequivalent topology in ocean and atmosphere only for
766	!-- PE0 in ocean and PE0 in atmosphere a target_id is needed, since
767	!-- data echxchange between ocean and atmosphere will be done only
768	!-- between these PEs.
769	IF ( myid == 0 ) THEN
770
771	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
772	target_id = numprocs
773	ELSE
774	target_id = 0
775	ENDIF
776
777	ENDIF
778
779	ENDIF
780
781	ENDIF
782
783
784	#endif
785
786	#else
787
788	!
789	!-- Array bounds when running on a single PE (respectively a non-parallel
790	!-- machine)
791	nxl = 0
792	nxr = nx
793	nxra = nx
794	nnx = nxr - nxl + 1
795	nys = 0
796	nyn = ny
797	nyna = ny
798	nny = nyn - nys + 1
799	nzb = 0
800	nzt = nz
801	nzta = nz
802	nnz = nz
803
804	ALLOCATE( hor_index_bounds(4,0:0) )
805	hor_index_bounds(1,0) = nxl
806	hor_index_bounds(2,0) = nxr
807	hor_index_bounds(3,0) = nys
808	hor_index_bounds(4,0) = nyn
809
810	!
811	!-- Array bounds for the pressure solver (in the parallel code, these bounds
812	!-- are the ones for the transposed arrays)
813	nys_x = nys
814	nyn_x = nyn
815	nyn_xa = nyn
816	nzb_x = nzb + 1
817	nzt_x = nzt
818	nzt_xa = nzt
819
820	nxl_y = nxl
821	nxr_y = nxr
822	nxr_ya = nxr
823	nzb_y = nzb + 1
824	nzt_y = nzt
825	nzt_ya = nzt
826
827	nxl_z = nxl
828	nxr_z = nxr
829	nxr_za = nxr
830	nys_z = nys
831	nyn_z = nyn
832	nyn_za = nyn
833
834	#endif
835
836	!
837	!-- Calculate number of grid levels necessary for the multigrid poisson solver
838	!-- as well as the gridpoint indices on each level
839	IF ( psolver == 'multigrid' ) THEN
840
841	!
842	!-- First calculate number of possible grid levels for the subdomains
843	mg_levels_x = 1
844	mg_levels_y = 1
845	mg_levels_z = 1
846
847	i = nnx
848	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
849	i = i / 2
850	mg_levels_x = mg_levels_x + 1
851	ENDDO
852
853	j = nny
854	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
855	j = j / 2
856	mg_levels_y = mg_levels_y + 1
857	ENDDO
858
859	k = nz ! do not use nnz because it might be > nz due to transposition
860	! requirements
861	DO WHILE ( MOD( k, 2 ) == 0 .AND. k /= 2 )
862	k = k / 2
863	mg_levels_z = mg_levels_z + 1
864	ENDDO
865
866	maximum_grid_level = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
867
868	!
869	!-- Find out, if the total domain allows more levels. These additional
870	!-- levels are identically processed on all PEs.
871	IF ( numprocs > 1 .AND. mg_switch_to_pe0_level /= -1 ) THEN
872
873	IF ( mg_levels_z > MIN( mg_levels_x, mg_levels_y ) ) THEN
874
875	mg_switch_to_pe0_level_l = maximum_grid_level
876
877	mg_levels_x = 1
878	mg_levels_y = 1
879
880	i = nx+1
881	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
882	i = i / 2
883	mg_levels_x = mg_levels_x + 1
884	ENDDO
885
886	j = ny+1
887	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
888	j = j / 2
889	mg_levels_y = mg_levels_y + 1
890	ENDDO
891
892	maximum_grid_level_l = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
893
894	IF ( maximum_grid_level_l > mg_switch_to_pe0_level_l ) THEN
895	mg_switch_to_pe0_level_l = maximum_grid_level_l - &
896	mg_switch_to_pe0_level_l + 1
897	ELSE
898	mg_switch_to_pe0_level_l = 0
899	ENDIF
900
901	ELSE
902	mg_switch_to_pe0_level_l = 0
903	maximum_grid_level_l = maximum_grid_level
904
905	ENDIF
906
907	!
908	!-- Use switch level calculated above only if it is not pre-defined
909	!-- by user
910	IF ( mg_switch_to_pe0_level == 0 ) THEN
911	IF ( mg_switch_to_pe0_level_l /= 0 ) THEN
912	mg_switch_to_pe0_level = mg_switch_to_pe0_level_l
913	maximum_grid_level = maximum_grid_level_l
914	ENDIF
915
916	ELSE
917	!
918	!-- Check pre-defined value and reset to default, if neccessary
919	IF ( mg_switch_to_pe0_level < mg_switch_to_pe0_level_l .OR. &
920	mg_switch_to_pe0_level >= maximum_grid_level_l ) THEN
921	message_string = 'mg_switch_to_pe0_level ' // &
922	'out of range and reset to default (=0)'
923	CALL message( 'init_pegrid', 'PA0235', 0, 1, 0, 6, 0 )
924	mg_switch_to_pe0_level = 0
925	ELSE
926	!
927	!-- Use the largest number of possible levels anyway and recalculate
928	!-- the switch level to this largest number of possible values
929	maximum_grid_level = maximum_grid_level_l
930
931	ENDIF
932
933	ENDIF
934
935	ENDIF
936
937	ALLOCATE( grid_level_count(maximum_grid_level), &
938	nxl_mg(maximum_grid_level), nxr_mg(maximum_grid_level), &
939	nyn_mg(maximum_grid_level), nys_mg(maximum_grid_level), &
940	nzt_mg(maximum_grid_level) )
941
942	grid_level_count = 0
943
944	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzt_l = nzt
945
946	DO i = maximum_grid_level, 1 , -1
947
948	IF ( i == mg_switch_to_pe0_level ) THEN
949	#if defined( __parallel ) && ! defined( __check )
950	!
951	!-- Save the grid size of the subdomain at the switch level, because
952	!-- it is needed in poismg.
953	ind(1) = nxl_l; ind(2) = nxr_l
954	ind(3) = nys_l; ind(4) = nyn_l
955	ind(5) = nzt_l
956	ALLOCATE( ind_all(5*numprocs), mg_loc_ind(5,0:numprocs-1) )
957	CALL MPI_ALLGATHER( ind, 5, MPI_INTEGER, ind_all, 5, &
958	MPI_INTEGER, comm2d, ierr )
959	DO j = 0, numprocs-1
960	DO k = 1, 5
961	mg_loc_ind(k,j) = ind_all(k+j*5)
962	ENDDO
963	ENDDO
964	DEALLOCATE( ind_all )
965	!
966	!-- Calculate the grid size of the total domain
967	nxr_l = ( nxr_l-nxl_l+1 ) * pdims(1) - 1
968	nxl_l = 0
969	nyn_l = ( nyn_l-nys_l+1 ) * pdims(2) - 1
970	nys_l = 0
971	!
972	!-- The size of this gathered array must not be larger than the
973	!-- array tend, which is used in the multigrid scheme as a temporary
974	!-- array. Therefore the subdomain size of an PE is calculated and
975	!-- the size of the gathered grid. These values are used in
976	!-- routines pres and poismg
977	subdomain_size = ( nxr - nxl + 2 * nbgp + 1 ) * &
978	( nyn - nys + 2 * nbgp + 1 ) * ( nzt - nzb + 2 )
979	gathered_size = ( nxr_l - nxl_l + 3 ) * ( nyn_l - nys_l + 3 ) * &
980	( nzt_l - nzb + 2 )
981
982	#elif ! defined ( __parallel )
983	message_string = 'multigrid gather/scatter impossible ' // &
984	'in non parallel mode'
985	CALL message( 'init_pegrid', 'PA0237', 1, 2, 0, 6, 0 )
986	#endif
987	ENDIF
988
989	nxl_mg(i) = nxl_l
990	nxr_mg(i) = nxr_l
991	nys_mg(i) = nys_l
992	nyn_mg(i) = nyn_l
993	nzt_mg(i) = nzt_l
994
995	nxl_l = nxl_l / 2
996	nxr_l = nxr_l / 2
997	nys_l = nys_l / 2
998	nyn_l = nyn_l / 2
999	nzt_l = nzt_l / 2
1000
1001	ENDDO
1002
1003	!
1004	!-- Temporary problem: Currently calculation of maxerror iin routine poismg crashes
1005	!-- if grid data are collected on PE0 already on the finest grid level.
1006	!-- To be solved later.
1007	IF ( maximum_grid_level == mg_switch_to_pe0_level ) THEN
1008	message_string = 'grid coarsening on subdomain level cannot be performed'
1009	CALL message( 'poismg', 'PA0236', 1, 2, 0, 6, 0 )
1010	ENDIF
1011
1012	ELSE
1013
1014	maximum_grid_level = 0
1015
1016	ENDIF
1017
1018	!
1019	!-- Default level 0 tells exchange_horiz that all ghost planes have to be
1020	!-- exchanged. grid_level is adjusted in poismg, where only one ghost plane
1021	!-- is required.
1022	grid_level = 0
1023
1024	#if defined( __parallel ) && ! defined ( __check )
1025	!
1026	!-- Gridpoint number for the exchange of ghost points (y-line for 2D-arrays)
1027	ngp_y = nyn - nys + 1 + 2 * nbgp
1028
1029	!
1030	!-- Define new MPI derived datatypes for the exchange of ghost points in
1031	!-- x- and y-direction for 2D-arrays (line)
1032	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_REAL, type_x, &
1033	ierr )
1034	CALL MPI_TYPE_COMMIT( type_x, ierr )
1035	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_INTEGER, &
1036	type_x_int, ierr )
1037	CALL MPI_TYPE_COMMIT( type_x_int, ierr )
1038
1039	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_REAL, type_y, ierr )
1040	CALL MPI_TYPE_COMMIT( type_y, ierr )
1041	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_INTEGER, type_y_int, ierr )
1042	CALL MPI_TYPE_COMMIT( type_y_int, ierr )
1043
1044
1045	!
1046	!-- Calculate gridpoint numbers for the exchange of ghost points along x
1047	!-- (yz-plane for 3D-arrays) and define MPI derived data type(s) for the
1048	!-- exchange of ghost points in y-direction (xz-plane).
1049	!-- Do these calculations for the model grid and (if necessary) also
1050	!-- for the coarser grid levels used in the multigrid method
1051	ALLOCATE ( ngp_yz(0:maximum_grid_level), type_xz(0:maximum_grid_level),&
1052	type_yz(0:maximum_grid_level) )
1053
1054	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzb_l = nzb; nzt_l = nzt
1055
1056	!
1057	!-- Discern between the model grid, which needs nbgp ghost points and
1058	!-- grid levels for the multigrid scheme. In the latter case only one
1059	!-- ghost point is necessary.
1060	!-- First definition of MPI-datatypes for exchange of ghost layers on normal
1061	!-- grid. The following loop is needed for data exchange in poismg.f90.
1062	!
1063	!-- Determine number of grid points of yz-layer for exchange
1064	ngp_yz(0) = (nzt - nzb + 2) * (nyn - nys + 1 + 2 * nbgp)
1065
1066	!
1067	!-- Define an MPI-datatype for the exchange of left/right boundaries.
1068	!-- Although data are contiguous in physical memory (which does not
1069	!-- necessarily require an MPI-derived datatype), the data exchange between
1070	!-- left and right PE's using the MPI-derived type is 10% faster than without.
1071	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2nbgp, nbgp(nzt-nzb+2), ngp_yz(0), &
1072	MPI_REAL, type_xz(0), ierr )
1073	CALL MPI_TYPE_COMMIT( type_xz(0), ierr )
1074
1075	CALL MPI_TYPE_VECTOR( nbgp, ngp_yz(0), ngp_yz(0), MPI_REAL, type_yz(0), &
1076	ierr )
1077	CALL MPI_TYPE_COMMIT( type_yz(0), ierr )
1078
1079	!
1080	!-- Definition of MPI-datatypes for multigrid method (coarser level grids)
1081	IF ( psolver == 'multigrid' ) THEN
1082	!
1083	!-- Definition of MPI-datatyoe as above, but only 1 ghost level is used
1084	DO i = maximum_grid_level, 1 , -1
1085
1086	ngp_yz(i) = (nzt_l - nzb_l + 2) * (nyn_l - nys_l + 3)
1087
1088	CALL MPI_TYPE_VECTOR( nxr_l-nxl_l+3, nzt_l-nzb_l+2, ngp_yz(i), &
1089	MPI_REAL, type_xz(i), ierr )
1090	CALL MPI_TYPE_COMMIT( type_xz(i), ierr )
1091
1092	CALL MPI_TYPE_VECTOR( 1, ngp_yz(i), ngp_yz(i), MPI_REAL, type_yz(i), &
1093	ierr )
1094	CALL MPI_TYPE_COMMIT( type_yz(i), ierr )
1095
1096	nxl_l = nxl_l / 2
1097	nxr_l = nxr_l / 2
1098	nys_l = nys_l / 2
1099	nyn_l = nyn_l / 2
1100	nzt_l = nzt_l / 2
1101
1102	ENDDO
1103
1104	ENDIF
1105	#endif
1106
1107	#if defined( __parallel ) && ! defined ( __check )
1108	!
1109	!-- Setting of flags for inflow/outflow conditions in case of non-cyclic
1110	!-- horizontal boundary conditions.
1111	IF ( pleft == MPI_PROC_NULL ) THEN
1112	IF ( bc_lr == 'dirichlet/radiation' .OR. bc_lr == 'dirichlet/neumann' ) THEN
1113	inflow_l = .TRUE.
1114	ELSEIF ( bc_lr == 'radiation/dirichlet' .OR. bc_lr == 'neumann/dirichlet' ) THEN
1115	outflow_l = .TRUE.
1116	ENDIF
1117	ENDIF
1118
1119	IF ( pright == MPI_PROC_NULL ) THEN
1120	IF ( bc_lr == 'dirichlet/radiation' .OR. bc_lr == 'dirichlet/neumann' ) THEN
1121	outflow_r = .TRUE.
1122	ELSEIF ( bc_lr == 'radiation/dirichlet' .OR. bc_lr == 'neumann/dirichlet' ) THEN
1123	inflow_r = .TRUE.
1124	ENDIF
1125	ENDIF
1126
1127	IF ( psouth == MPI_PROC_NULL ) THEN
1128	IF ( bc_ns == 'dirichlet/radiation' .OR. bc_ns == 'dirichlet/neumann' ) THEN
1129	outflow_s = .TRUE.
1130	ELSEIF ( bc_ns == 'radiation/dirichlet' .OR. bc_ns == 'neumann/dirichlet' ) THEN
1131	inflow_s = .TRUE.
1132	ENDIF
1133	ENDIF
1134
1135	IF ( pnorth == MPI_PROC_NULL ) THEN
1136	IF ( bc_ns == 'dirichlet/radiation' .OR. bc_ns == 'dirichlet/neumann' ) THEN
1137	inflow_n = .TRUE.
1138	ELSEIF ( bc_ns == 'radiation/dirichlet' .OR. bc_ns == 'neumann/dirichlet' ) THEN
1139	outflow_n = .TRUE.
1140	ENDIF
1141	ENDIF
1142
1143	!
1144	!-- Broadcast the id of the inflow PE
1145	IF ( inflow_l ) THEN
1146	id_inflow_l = myidx
1147	ELSE
1148	id_inflow_l = 0
1149	ENDIF
1150	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1151	CALL MPI_ALLREDUCE( id_inflow_l, id_inflow, 1, MPI_INTEGER, MPI_SUM, &
1152	comm1dx, ierr )
1153
1154	!
1155	!-- Broadcast the id of the recycling plane
1156	!-- WARNING: needs to be adjusted in case of inflows other than from left side!
1157	IF ( ( recycling_width / dx ) >= nxl .AND. &
1158	( recycling_width / dx ) <= nxr ) THEN
1159	id_recycling_l = myidx
1160	ELSE
1161	id_recycling_l = 0
1162	ENDIF
1163	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1164	CALL MPI_ALLREDUCE( id_recycling_l, id_recycling, 1, MPI_INTEGER, MPI_SUM, &
1165	comm1dx, ierr )
1166
1167	#elif ! defined ( __parallel )
1168	IF ( bc_lr == 'dirichlet/radiation' .OR. bc_lr == 'dirichlet/neumann' ) THEN
1169	inflow_l = .TRUE.
1170	outflow_r = .TRUE.
1171	ELSEIF ( bc_lr == 'radiation/dirichlet' .OR. bc_lr == 'neumann/dirichlet' ) THEN
1172	outflow_l = .TRUE.
1173	inflow_r = .TRUE.
1174	ENDIF
1175
1176	IF ( bc_ns == 'dirichlet/radiation' .OR. bc_ns == 'dirichlet/neumann' ) THEN
1177	inflow_n = .TRUE.
1178	outflow_s = .TRUE.
1179	ELSEIF ( bc_ns == 'radiation/dirichlet' .OR. bc_ns == 'neumann/dirichlet' ) THEN
1180	outflow_n = .TRUE.
1181	inflow_s = .TRUE.
1182	ENDIF
1183	#endif
1184
1185	!
1186	!-- At the inflow or outflow, u or v, respectively, have to be calculated for
1187	!-- one more grid point.
1188	IF ( inflow_l .OR. outflow_l ) THEN
1189	nxlu = nxl + 1
1190	ELSE
1191	nxlu = nxl
1192	ENDIF
1193	IF ( inflow_s .OR. outflow_s ) THEN
1194	nysv = nys + 1
1195	ELSE
1196	nysv = nys
1197	ENDIF
1198
1199	IF ( psolver == 'poisfft_hybrid' ) THEN
1200	CALL poisfft_hybrid_ini
1201	ELSEIF ( psolver == 'poisfft' ) THEN
1202	CALL poisfft_init
1203	ENDIF
1204
1205	!
1206	!-- Allocate wall flag arrays used in the multigrid solver
1207	IF ( psolver == 'multigrid' ) THEN
1208
1209	DO i = maximum_grid_level, 1, -1
1210
1211	SELECT CASE ( i )
1212
1213	CASE ( 1 )
1214	ALLOCATE( wall_flags_1(nzb:nzt_mg(i)+1, &
1215	nys_mg(i)-1:nyn_mg(i)+1, &
1216	nxl_mg(i)-1:nxr_mg(i)+1) )
1217
1218	CASE ( 2 )
1219	ALLOCATE( wall_flags_2(nzb:nzt_mg(i)+1, &
1220	nys_mg(i)-1:nyn_mg(i)+1, &
1221	nxl_mg(i)-1:nxr_mg(i)+1) )
1222
1223	CASE ( 3 )
1224	ALLOCATE( wall_flags_3(nzb:nzt_mg(i)+1, &
1225	nys_mg(i)-1:nyn_mg(i)+1, &
1226	nxl_mg(i)-1:nxr_mg(i)+1) )
1227
1228	CASE ( 4 )
1229	ALLOCATE( wall_flags_4(nzb:nzt_mg(i)+1, &
1230	nys_mg(i)-1:nyn_mg(i)+1, &
1231	nxl_mg(i)-1:nxr_mg(i)+1) )
1232
1233	CASE ( 5 )
1234	ALLOCATE( wall_flags_5(nzb:nzt_mg(i)+1, &
1235	nys_mg(i)-1:nyn_mg(i)+1, &
1236	nxl_mg(i)-1:nxr_mg(i)+1) )
1237
1238	CASE ( 6 )
1239	ALLOCATE( wall_flags_6(nzb:nzt_mg(i)+1, &
1240	nys_mg(i)-1:nyn_mg(i)+1, &
1241	nxl_mg(i)-1:nxr_mg(i)+1) )
1242
1243	CASE ( 7 )
1244	ALLOCATE( wall_flags_7(nzb:nzt_mg(i)+1, &
1245	nys_mg(i)-1:nyn_mg(i)+1, &
1246	nxl_mg(i)-1:nxr_mg(i)+1) )
1247
1248	CASE ( 8 )
1249	ALLOCATE( wall_flags_8(nzb:nzt_mg(i)+1, &
1250	nys_mg(i)-1:nyn_mg(i)+1, &
1251	nxl_mg(i)-1:nxr_mg(i)+1) )
1252
1253	CASE ( 9 )
1254	ALLOCATE( wall_flags_9(nzb:nzt_mg(i)+1, &
1255	nys_mg(i)-1:nyn_mg(i)+1, &
1256	nxl_mg(i)-1:nxr_mg(i)+1) )
1257
1258	CASE ( 10 )
1259	ALLOCATE( wall_flags_10(nzb:nzt_mg(i)+1, &
1260	nys_mg(i)-1:nyn_mg(i)+1, &
1261	nxl_mg(i)-1:nxr_mg(i)+1) )
1262
1263	CASE DEFAULT
1264	message_string = 'more than 10 multigrid levels'
1265	CALL message( 'init_pegrid', 'PA0238', 1, 2, 0, 6, 0 )
1266
1267	END SELECT
1268
1269	ENDDO
1270
1271	ENDIF
1272
1273	!
1274	!-- Calculate the number of groups into which parallel I/O is split.
1275	!-- The default for files which are opened by all PEs (or where each
1276	!-- PE opens his own independent file) is, that all PEs are doing input/output
1277	!-- in parallel at the same time. This might cause performance or even more
1278	!-- severe problems depending on the configuration of the underlying file
1279	!-- system.
1280	!-- First, set the default:
1281	IF ( maximum_parallel_io_streams == -1 .OR. &
1282	maximum_parallel_io_streams > numprocs ) THEN
1283	maximum_parallel_io_streams = numprocs
1284	ENDIF
1285
1286	!
1287	!-- Now calculate the number of io_blocks and the io_group to which the
1288	!-- respective PE belongs. I/O of the groups is done in serial, but in parallel
1289	!-- for all PEs belonging to the same group. A preliminary setting with myid
1290	!-- based on MPI_COMM_WORLD has been done in parin.
1291	io_blocks = numprocs / maximum_parallel_io_streams
1292	io_group = MOD( myid+1, io_blocks )
1293
1294
1295	END SUBROUTINE init_pegrid

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