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source: palm/trunk/SOURCE/init_pegrid.f90 @ 754

Last change on this file since 754 was 723, checked in by raasch, 14 years ago
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1	SUBROUTINE init_pegrid
2
3	!------------------------------------------------------------------------------!
4	! Current revisions:
5	! -----------------
6	!
7	!
8	! ATTENTION: nnz_x undefined problem still has to be solved!!!!!!!!
9	! TEST OUTPUT (TO BE REMOVED) logging mpi2 ierr values
10	!
11	! Former revisions:
12	! -----------------
13	! $Id: init_pegrid.f90 723 2011-04-11 06:28:19Z raasch $
14	!
15	! 722 2011-04-11 06:21:09Z raasch
16	! Bugfix: bc_lr/ns_cyc/dirrad/raddir replaced by bc_lr/ns, because variables
17	! are not yet set here; grid_level set to 0
18	!
19	! 709 2011-03-30 09:31:40Z raasch
20	! formatting adjustments
21	!
22	! 707 2011-03-29 11:39:40Z raasch
23	! bc_lr/ns replaced by bc_lr/ns_cyc/dirrad/raddir
24	!
25	! 667 2010-12-23 12:06:00Z suehring/gryschka
26	! Moved determination of target_id's from init_coupling
27	! Determination of parameters needed for coupling (coupling_topology, ngp_a,
28	! ngp_o) with different grid/processor-topology in ocean and atmosphere
29	! Adaption of ngp_xy, ngp_y to a dynamic number of ghost points.
30	! The maximum_grid_level changed from 1 to 0. 0 is the normal grid, 1 to
31	! maximum_grid_level the grids for multigrid, in which 0 and 1 are normal grids.
32	! This distinction is due to reasons of data exchange and performance for the
33	! normal grid and grids in poismg.
34	! The definition of MPI-Vectors adapted to a dynamic numer of ghost points.
35	! New MPI-Vectors for data exchange between left and right boundaries added.
36	! This is due to reasons of performance (10% faster).
37	!
38	! 646 2010-12-15 13:03:52Z raasch
39	! lctit is now using a 2d decomposition by default
40	!
41	! 622 2010-12-10 08:08:13Z raasch
42	! optional barriers included in order to speed up collective operations
43	!
44	! 438 2010-02-01 04:32:43Z raasch
45	! 2d-decomposition is default for Cray-XT machines
46	!
47	! 274 2009-03-26 15:11:21Z heinze
48	! Output of messages replaced by message handling routine.
49	!
50	! 206 2008-10-13 14:59:11Z raasch
51	! Implementation of a MPI-1 coupling: added __parallel within the __mpi2 part
52	! 2d-decomposition is default on SGI-ICE systems
53	!
54	! 197 2008-09-16 15:29:03Z raasch
55	! multigrid levels are limited by subdomains if mg_switch_to_pe0_level = -1,
56	! nz is used instead nnz for calculating mg-levels
57	! Collect on PE0 horizontal index bounds from all other PEs,
58	! broadcast the id of the inflow PE (using the respective communicator)
59	!
60	! 114 2007-10-10 00:03:15Z raasch
61	! Allocation of wall flag arrays for multigrid solver
62	!
63	! 108 2007-08-24 15:10:38Z letzel
64	! Intercommunicator (comm_inter) and derived data type (type_xy) for
65	! coupled model runs created, assign coupling_mode_remote,
66	! indices nxlu and nysv are calculated (needed for non-cyclic boundary
67	! conditions)
68	!
69	! 82 2007-04-16 15:40:52Z raasch
70	! Cpp-directive lcmuk changed to intel_openmp_bug, setting of host on lcmuk by
71	! cpp-directive removed
72	!
73	! 75 2007-03-22 09:54:05Z raasch
74	! uxrp, vynp eliminated,
75	! dirichlet/neumann changed to dirichlet/radiation, etc.,
76	! poisfft_init is only called if fft-solver is switched on
77	!
78	! RCS Log replace by Id keyword, revision history cleaned up
79	!
80	! Revision 1.28 2006/04/26 13:23:32 raasch
81	! lcmuk does not understand the !$ comment so a cpp-directive is required
82	!
83	! Revision 1.1 1997/07/24 11:15:09 raasch
84	! Initial revision
85	!
86	!
87	! Description:
88	! ------------
89	! Determination of the virtual processor topology (if not prescribed by the
90	! user)and computation of the grid point number and array bounds of the local
91	! domains.
92	!------------------------------------------------------------------------------!
93
94	USE control_parameters
95	USE fft_xy
96	USE grid_variables
97	USE indices
98	USE pegrid
99	USE poisfft_mod
100	USE poisfft_hybrid_mod
101	USE statistics
102	USE transpose_indices
103
104
105
106	IMPLICIT NONE
107
108	INTEGER :: gathered_size, i, id_inflow_l, id_recycling_l, ind(5), j, k, &
109	maximum_grid_level_l, mg_switch_to_pe0_level_l, mg_levels_x, &
110	mg_levels_y, mg_levels_z, nnx_y, nnx_z, nny_x, nny_z, nnz_x, &
111	nnz_y, numproc_sqr, nx_total, nxl_l, nxr_l, nyn_l, nys_l, &
112	nzb_l, nzt_l, omp_get_num_threads, subdomain_size
113
114	INTEGER, DIMENSION(:), ALLOCATABLE :: ind_all, nxlf, nxrf, nynf, nysf
115
116	INTEGER, DIMENSION(2) :: pdims_remote
117
118	LOGICAL :: found
119
120	!
121	!-- Get the number of OpenMP threads
122	!$OMP PARALLEL
123	#if defined( __intel_openmp_bug )
124	threads_per_task = omp_get_num_threads()
125	#else
126	!$ threads_per_task = omp_get_num_threads()
127	#endif
128	!$OMP END PARALLEL
129
130
131	#if defined( __parallel )
132
133	!
134	!-- Determine the processor topology or check it, if prescribed by the user
135	IF ( npex == -1 .AND. npey == -1 ) THEN
136
137	!
138	!-- Automatic determination of the topology
139	!-- The default on SMP- and cluster-hosts is a 1d-decomposition along x
140	IF ( host(1:3) == 'ibm' .OR. host(1:3) == 'nec' .OR. &
141	( host(1:2) == 'lc' .AND. host(3:5) /= 'sgi' .AND. &
142	host(3:4) /= 'xt' .AND. host(3:5) /= 'tit' ) .OR. &
143	host(1:3) == 'dec' ) THEN
144
145	pdims(1) = numprocs
146	pdims(2) = 1
147
148	ELSE
149
150	numproc_sqr = SQRT( REAL( numprocs ) )
151	pdims(1) = MAX( numproc_sqr , 1 )
152	DO WHILE ( MOD( numprocs , pdims(1) ) /= 0 )
153	pdims(1) = pdims(1) - 1
154	ENDDO
155	pdims(2) = numprocs / pdims(1)
156
157	ENDIF
158
159	ELSEIF ( npex /= -1 .AND. npey /= -1 ) THEN
160
161	!
162	!-- Prescribed by user. Number of processors on the prescribed topology
163	!-- must be equal to the number of PEs available to the job
164	IF ( ( npex * npey ) /= numprocs ) THEN
165	WRITE( message_string, * ) 'number of PEs of the prescribed ', &
166	'topology (', npex*npey,') does not match & the number of ', &
167	'PEs available to the job (', numprocs, ')'
168	CALL message( 'init_pegrid', 'PA0221', 1, 2, 0, 6, 0 )
169	ENDIF
170	pdims(1) = npex
171	pdims(2) = npey
172
173	ELSE
174	!
175	!-- If the processor topology is prescribed by the user, the number of
176	!-- PEs must be given in both directions
177	message_string = 'if the processor topology is prescribed by the, ' // &
178	' user& both values of "npex" and "npey" must be given ' // &
179	'in the &NAMELIST-parameter file'
180	CALL message( 'init_pegrid', 'PA0222', 1, 2, 0, 6, 0 )
181
182	ENDIF
183
184	!
185	!-- The hybrid solver can only be used in case of a 1d-decomposition along x
186	IF ( pdims(2) /= 1 .AND. psolver == 'poisfft_hybrid' ) THEN
187	message_string = 'psolver = "poisfft_hybrid" can only be' // &
188	'& used in case of a 1d-decomposition along x'
189	CALL message( 'init_pegrid', 'PA0223', 1, 2, 0, 6, 0 )
190	ENDIF
191
192	!
193	!-- For communication speedup, set barriers in front of collective
194	!-- communications by default on SGI-type systems
195	IF ( host(3:5) == 'sgi' ) collective_wait = .TRUE.
196
197	!
198	!-- If necessary, set horizontal boundary conditions to non-cyclic
199	IF ( bc_lr /= 'cyclic' ) cyclic(1) = .FALSE.
200	IF ( bc_ns /= 'cyclic' ) cyclic(2) = .FALSE.
201
202	!
203	!-- Create the virtual processor grid
204	CALL MPI_CART_CREATE( comm_palm, ndim, pdims, cyclic, reorder, &
205	comm2d, ierr )
206	CALL MPI_COMM_RANK( comm2d, myid, ierr )
207	WRITE (myid_char,'(''_'',I4.4)') myid
208
209	CALL MPI_CART_COORDS( comm2d, myid, ndim, pcoord, ierr )
210	CALL MPI_CART_SHIFT( comm2d, 0, 1, pleft, pright, ierr )
211	CALL MPI_CART_SHIFT( comm2d, 1, 1, psouth, pnorth, ierr )
212
213	!
214	!-- Determine sub-topologies for transpositions
215	!-- Transposition from z to x:
216	remain_dims(1) = .TRUE.
217	remain_dims(2) = .FALSE.
218	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dx, ierr )
219	CALL MPI_COMM_RANK( comm1dx, myidx, ierr )
220	!
221	!-- Transposition from x to y
222	remain_dims(1) = .FALSE.
223	remain_dims(2) = .TRUE.
224	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dy, ierr )
225	CALL MPI_COMM_RANK( comm1dy, myidy, ierr )
226
227
228	!
229	!-- Find a grid (used for array d) which will match the transposition demands
230	IF ( grid_matching == 'strict' ) THEN
231
232	nxa = nx; nya = ny; nza = nz
233
234	ELSE
235
236	found = .FALSE.
237	xn: DO nxa = nx, 2*nx
238	!
239	!-- Meet conditions for nx
240	IF ( MOD( nxa+1, pdims(1) ) /= 0 .OR. &
241	MOD( nxa+1, pdims(2) ) /= 0 ) CYCLE xn
242
243	yn: DO nya = ny, 2*ny
244	!
245	!-- Meet conditions for ny
246	IF ( MOD( nya+1, pdims(2) ) /= 0 .OR. &
247	MOD( nya+1, pdims(1) ) /= 0 ) CYCLE yn
248
249
250	zn: DO nza = nz, 2*nz
251	!
252	!-- Meet conditions for nz
253	IF ( ( MOD( nza, pdims(1) ) /= 0 .AND. pdims(1) /= 1 .AND. &
254	pdims(2) /= 1 ) .OR. &
255	( MOD( nza, pdims(2) ) /= 0 .AND. dt_dosp /= 9999999.9 &
256	) ) THEN
257	CYCLE zn
258	ELSE
259	found = .TRUE.
260	EXIT xn
261	ENDIF
262
263	ENDDO zn
264
265	ENDDO yn
266
267	ENDDO xn
268
269	IF ( .NOT. found ) THEN
270	message_string = 'no matching grid for transpositions found'
271	CALL message( 'init_pegrid', 'PA0224', 1, 2, 0, 6, 0 )
272	ENDIF
273
274	ENDIF
275
276	!
277	!-- Calculate array bounds in x-direction for every PE.
278	!-- The last PE along x may get less grid points than the others
279	ALLOCATE( nxlf(0:pdims(1)-1), nxrf(0:pdims(1)-1), nynf(0:pdims(2)-1), &
280	nysf(0:pdims(2)-1), nnx_pe(0:pdims(1)-1), nny_pe(0:pdims(2)-1) )
281
282	IF ( MOD( nxa+1 , pdims(1) ) /= 0 ) THEN
283	WRITE( message_string, * ) 'x-direction: gridpoint number (',nx+1,') ',&
284	'is not an& integral divisor of the number ', &
285	'processors (', pdims(1),')'
286	CALL message( 'init_pegrid', 'PA0225', 1, 2, 0, 6, 0 )
287	ELSE
288	nnx = ( nxa + 1 ) / pdims(1)
289	IF ( nnx*pdims(1) - ( nx + 1) > nnx ) THEN
290	WRITE( message_string, * ) 'x-direction: nx does not match the', &
291	'requirements given by the number of PEs &used', &
292	'& please use nx = ', nx - ( pdims(1) - ( nnx*pdims(1) &
293	- ( nx + 1 ) ) ), ' instead of nx =', nx
294	CALL message( 'init_pegrid', 'PA0226', 1, 2, 0, 6, 0 )
295	ENDIF
296	ENDIF
297
298	!
299	!-- Left and right array bounds, number of gridpoints
300	DO i = 0, pdims(1)-1
301	nxlf(i) = i * nnx
302	nxrf(i) = ( i + 1 ) * nnx - 1
303	nnx_pe(i) = MIN( nx, nxrf(i) ) - nxlf(i) + 1
304	ENDDO
305
306	!
307	!-- Calculate array bounds in y-direction for every PE.
308	IF ( MOD( nya+1 , pdims(2) ) /= 0 ) THEN
309	WRITE( message_string, * ) 'y-direction: gridpoint number (',ny+1,') ', &
310	'is not an& integral divisor of the number of', &
311	'processors (', pdims(2),')'
312	CALL message( 'init_pegrid', 'PA0227', 1, 2, 0, 6, 0 )
313	ELSE
314	nny = ( nya + 1 ) / pdims(2)
315	IF ( nny*pdims(2) - ( ny + 1) > nny ) THEN
316	WRITE( message_string, * ) 'y-direction: ny does not match the', &
317	'requirements given by the number of PEs &used ', &
318	'& please use ny = ', ny - ( pdims(2) - ( nnx*pdims(2) &
319	- ( ny + 1 ) ) ), ' instead of ny =', ny
320	CALL message( 'init_pegrid', 'PA0228', 1, 2, 0, 6, 0 )
321	ENDIF
322	ENDIF
323
324	!
325	!-- South and north array bounds
326	DO j = 0, pdims(2)-1
327	nysf(j) = j * nny
328	nynf(j) = ( j + 1 ) * nny - 1
329	nny_pe(j) = MIN( ny, nynf(j) ) - nysf(j) + 1
330	ENDDO
331
332	!
333	!-- Local array bounds of the respective PEs
334	nxl = nxlf(pcoord(1))
335	nxra = nxrf(pcoord(1))
336	nxr = MIN( nx, nxra )
337	nys = nysf(pcoord(2))
338	nyna = nynf(pcoord(2))
339	nyn = MIN( ny, nyna )
340	nzb = 0
341	nzta = nza
342	nzt = MIN( nz, nzta )
343	nnz = nza
344
345	!
346	!-- Set switches to define if the PE is situated at the border of the virtual
347	!-- processor grid
348	IF ( nxl == 0 ) left_border_pe = .TRUE.
349	IF ( nxr == nx ) right_border_pe = .TRUE.
350	IF ( nys == 0 ) south_border_pe = .TRUE.
351	IF ( nyn == ny ) north_border_pe = .TRUE.
352
353	!
354	!-- Calculate array bounds and gridpoint numbers for the transposed arrays
355	!-- (needed in the pressure solver)
356	!-- For the transposed arrays, cyclic boundaries as well as top and bottom
357	!-- boundaries are omitted, because they are obstructive to the transposition
358
359	!
360	!-- 1. transposition z --> x
361	!-- This transposition is not neccessary in case of a 1d-decomposition along x,
362	!-- except that the uptream-spline method is switched on
363	IF ( pdims(2) /= 1 .OR. momentum_advec == 'ups-scheme' .OR. &
364	scalar_advec == 'ups-scheme' ) THEN
365
366	IF ( pdims(2) == 1 .AND. ( momentum_advec == 'ups-scheme' .OR. &
367	scalar_advec == 'ups-scheme' ) ) THEN
368	message_string = '1d-decomposition along x ' // &
369	'chosen but nz restrictions may occur' // &
370	'& since ups-scheme is activated'
371	CALL message( 'init_pegrid', 'PA0229', 0, 1, 0, 6, 0 )
372	ENDIF
373	nys_x = nys
374	nyn_xa = nyna
375	nyn_x = nyn
376	nny_x = nny
377	IF ( MOD( nza , pdims(1) ) /= 0 ) THEN
378	WRITE( message_string, * ) 'transposition z --> x:', &
379	'&nz=',nz,' is not an integral divisior of pdims(1)=', &
380	pdims(1)
381	CALL message( 'init_pegrid', 'PA0230', 1, 2, 0, 6, 0 )
382	ENDIF
383	nnz_x = nza / pdims(1)
384	nzb_x = 1 + myidx * nnz_x
385	nzt_xa = ( myidx + 1 ) * nnz_x
386	nzt_x = MIN( nzt, nzt_xa )
387
388	sendrecvcount_zx = nnx * nny * nnz_x
389
390	ELSE
391	!
392	!--- Setting of dummy values because otherwise variables are undefined in
393	!--- the next step x --> y
394	!--- WARNING: This case has still to be clarified!!!!!!!!!!!!
395	nnz_x = 1
396	nzb_x = 1
397	nzt_xa = 1
398	nzt_x = 1
399	nny_x = nny
400
401	ENDIF
402
403	!
404	!-- 2. transposition x --> y
405	nnz_y = nnz_x
406	nzb_y = nzb_x
407	nzt_ya = nzt_xa
408	nzt_y = nzt_x
409	IF ( MOD( nxa+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 = (nxa+1) / pdims(2)
416	nxl_y = myidy * nnx_y
417	nxr_ya = ( myidy + 1 ) * nnx_y - 1
418	nxr_y = MIN( nx, nxr_ya )
419
420	sendrecvcount_xy = nnx_y * nny_x * nnz_y
421
422	!
423	!-- 3. transposition y --> z (ELSE: x --> y in case of 1D-decomposition
424	!-- along x)
425	IF ( pdims(2) /= 1 .OR. momentum_advec == 'ups-scheme' .OR. &
426	scalar_advec == 'ups-scheme' ) THEN
427	!
428	!-- y --> z
429	!-- This transposition is not neccessary in case of a 1d-decomposition
430	!-- along x, except that the uptream-spline method is switched on
431	nnx_z = nnx_y
432	nxl_z = nxl_y
433	nxr_za = nxr_ya
434	nxr_z = nxr_y
435	IF ( MOD( nya+1 , pdims(1) ) /= 0 ) THEN
436	WRITE( message_string, * ) 'transposition y --> z:', &
437	'& ny+1=',ny+1,' is not an integral divisor of ',&
438	'pdims(1)=',pdims(1)
439	CALL message( 'init_pegrid', 'PA0232', 1, 2, 0, 6, 0 )
440	ENDIF
441	nny_z = (nya+1) / pdims(1)
442	nys_z = myidx * nny_z
443	nyn_za = ( myidx + 1 ) * nny_z - 1
444	nyn_z = MIN( ny, nyn_za )
445
446	sendrecvcount_yz = nnx_y * nny_z * nnz_y
447
448	ELSE
449	!
450	!-- x --> y. This condition must be fulfilled for a 1D-decomposition along x
451	IF ( MOD( nya+1 , pdims(1) ) /= 0 ) THEN
452	WRITE( message_string, * ) 'transposition x --> y:', &
453	'& ny+1=',ny+1,' is not an integral divisor of ',&
454	'pdims(1)=',pdims(1)
455	CALL message( 'init_pegrid', 'PA0233', 1, 2, 0, 6, 0 )
456	ENDIF
457
458	ENDIF
459
460	!
461	!-- Indices for direct transpositions z --> y (used for calculating spectra)
462	IF ( dt_dosp /= 9999999.9 ) THEN
463	IF ( MOD( nza, pdims(2) ) /= 0 ) THEN
464	WRITE( message_string, * ) 'direct transposition z --> y (needed ', &
465	'for spectra):& nz=',nz,' is not an integral divisor of ',&
466	'pdims(2)=',pdims(2)
467	CALL message( 'init_pegrid', 'PA0234', 1, 2, 0, 6, 0 )
468	ELSE
469	nxl_yd = nxl
470	nxr_yda = nxra
471	nxr_yd = nxr
472	nzb_yd = 1 + myidy * ( nza / pdims(2) )
473	nzt_yda = ( myidy + 1 ) * ( nza / pdims(2) )
474	nzt_yd = MIN( nzt, nzt_yda )
475
476	sendrecvcount_zyd = nnx * nny * ( nza / pdims(2) )
477	ENDIF
478	ENDIF
479
480	!
481	!-- Indices for direct transpositions y --> x (they are only possible in case
482	!-- of a 1d-decomposition along x)
483	IF ( pdims(2) == 1 ) THEN
484	nny_x = nny / pdims(1)
485	nys_x = myid * nny_x
486	nyn_xa = ( myid + 1 ) * nny_x - 1
487	nyn_x = MIN( ny, nyn_xa )
488	nzb_x = 1
489	nzt_xa = nza
490	nzt_x = nz
491	sendrecvcount_xy = nnx * nny_x * nza
492	ENDIF
493
494	!
495	!-- Indices for direct transpositions x --> y (they are only possible in case
496	!-- of a 1d-decomposition along y)
497	IF ( pdims(1) == 1 ) THEN
498	nnx_y = nnx / pdims(2)
499	nxl_y = myid * nnx_y
500	nxr_ya = ( myid + 1 ) * nnx_y - 1
501	nxr_y = MIN( nx, nxr_ya )
502	nzb_y = 1
503	nzt_ya = nza
504	nzt_y = nz
505	sendrecvcount_xy = nnx_y * nny * nza
506	ENDIF
507
508	!
509	!-- Arrays for storing the array bounds are needed any more
510	DEALLOCATE( nxlf , nxrf , nynf , nysf )
511
512	!
513	!-- Collect index bounds from other PEs (to be written to restart file later)
514	ALLOCATE( hor_index_bounds(4,0:numprocs-1) )
515
516	IF ( myid == 0 ) THEN
517
518	hor_index_bounds(1,0) = nxl
519	hor_index_bounds(2,0) = nxr
520	hor_index_bounds(3,0) = nys
521	hor_index_bounds(4,0) = nyn
522
523	!
524	!-- Receive data from all other PEs
525	DO i = 1, numprocs-1
526	CALL MPI_RECV( ibuf, 4, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
527	ierr )
528	hor_index_bounds(:,i) = ibuf(1:4)
529	ENDDO
530
531	ELSE
532	!
533	!-- Send index bounds to PE0
534	ibuf(1) = nxl
535	ibuf(2) = nxr
536	ibuf(3) = nys
537	ibuf(4) = nyn
538	CALL MPI_SEND( ibuf, 4, MPI_INTEGER, 0, myid, comm2d, ierr )
539
540	ENDIF
541
542	#if defined( __print )
543	!
544	!-- Control output
545	IF ( myid == 0 ) THEN
546	PRINT, ' processor topology *'
547	PRINT*, ' '
548	PRINT*, 'myid pcoord left right south north idx idy nxl: nxr',&
549	&' nys: nyn'
550	PRINT*, '------------------------------------------------------------',&
551	&'-----------'
552	WRITE (*,1000) 0, pcoord(1), pcoord(2), pleft, pright, psouth, pnorth, &
553	myidx, myidy, nxl, nxr, nys, nyn
554	1000 FORMAT (I4,2X,'(',I3,',',I3,')',3X,I4,2X,I4,3X,I4,2X,I4,2X,I3,1X,I3, &
555	2(2X,I4,':',I4))
556
557	!
558	!-- Receive data from the other PEs
559	DO i = 1,numprocs-1
560	CALL MPI_RECV( ibuf, 12, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
561	ierr )
562	WRITE (*,1000) i, ( ibuf(j) , j = 1,12 )
563	ENDDO
564	ELSE
565
566	!
567	!-- Send data to PE0
568	ibuf(1) = pcoord(1); ibuf(2) = pcoord(2); ibuf(3) = pleft
569	ibuf(4) = pright; ibuf(5) = psouth; ibuf(6) = pnorth; ibuf(7) = myidx
570	ibuf(8) = myidy; ibuf(9) = nxl; ibuf(10) = nxr; ibuf(11) = nys
571	ibuf(12) = nyn
572	CALL MPI_SEND( ibuf, 12, MPI_INTEGER, 0, myid, comm2d, ierr )
573	ENDIF
574	#endif
575
576	#if defined( __parallel )
577	#if defined( __mpi2 )
578	!
579	!-- In case of coupled runs, get the port name on PE0 of the atmosphere model
580	!-- and pass it to PE0 of the ocean model
581	IF ( myid == 0 ) THEN
582
583	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
584
585	CALL MPI_OPEN_PORT( MPI_INFO_NULL, port_name, ierr )
586
587	CALL MPI_PUBLISH_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, &
588	ierr )
589
590	!
591	!-- Write a flag file for the ocean model and the other atmosphere
592	!-- processes.
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	OPEN( 90, FILE='COUPLING_PORT_OPENED', FORM='FORMATTED' )
597	WRITE ( 90, '(''TRUE'')' )
598	CLOSE ( 90 )
599
600	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
601
602	!
603	!-- Continue only if the atmosphere model has created the port.
604	!-- There seems to be a bug in MPICH2 which causes hanging processes
605	!-- in case that execution of LOOKUP_NAME is continued too early
606	!-- (i.e. before the port has been created)
607	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
608	DO WHILE ( .NOT. found )
609	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
610	ENDDO
611
612	CALL MPI_LOOKUP_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, ierr )
613
614	ENDIF
615
616	ENDIF
617
618	!
619	!-- In case of coupled runs, establish the connection between the atmosphere
620	!-- and the ocean model and define the intercommunicator (comm_inter)
621	CALL MPI_BARRIER( comm2d, ierr )
622	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
623
624	CALL MPI_COMM_ACCEPT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
625	comm_inter, ierr )
626	coupling_mode_remote = 'ocean_to_atmosphere'
627
628	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
629
630	CALL MPI_COMM_CONNECT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
631	comm_inter, ierr )
632	coupling_mode_remote = 'atmosphere_to_ocean'
633
634	ENDIF
635	#endif
636
637	!
638	!-- Determine the number of ghost point layers
639	IF ( scalar_advec == 'ws-scheme' .OR. momentum_advec == 'ws-scheme' ) THEN
640	nbgp = 3
641	ELSE
642	nbgp = 1
643	ENDIF
644
645	!
646	!-- Create a new MPI derived datatype for the exchange of surface (xy) data,
647	!-- which is needed for coupled atmosphere-ocean runs.
648	!-- First, calculate number of grid points of an xy-plane.
649	ngp_xy = ( nxr - nxl + 1 + 2 * nbgp ) * ( nyn - nys + 1 + 2 * nbgp )
650	CALL MPI_TYPE_VECTOR( ngp_xy, 1, nzt-nzb+2, MPI_REAL, type_xy, ierr )
651	CALL MPI_TYPE_COMMIT( type_xy, ierr )
652
653	IF ( TRIM( coupling_mode ) /= 'uncoupled' ) THEN
654
655	!
656	!-- Pass the number of grid points of the atmosphere model to
657	!-- the ocean model and vice versa
658	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
659
660	nx_a = nx
661	ny_a = ny
662
663	IF ( myid == 0 ) THEN
664
665	CALL MPI_SEND( nx_a, 1, MPI_INTEGER, numprocs, 1, comm_inter, &
666	ierr )
667	CALL MPI_SEND( ny_a, 1, MPI_INTEGER, numprocs, 2, comm_inter, &
668	ierr )
669	CALL MPI_SEND( pdims, 2, MPI_INTEGER, numprocs, 3, comm_inter, &
670	ierr )
671	CALL MPI_RECV( nx_o, 1, MPI_INTEGER, numprocs, 4, comm_inter, &
672	status, ierr )
673	CALL MPI_RECV( ny_o, 1, MPI_INTEGER, numprocs, 5, comm_inter, &
674	status, ierr )
675	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, numprocs, 6, &
676	comm_inter, status, ierr )
677	ENDIF
678
679	CALL MPI_BCAST( nx_o, 1, MPI_INTEGER, 0, comm2d, ierr )
680	CALL MPI_BCAST( ny_o, 1, MPI_INTEGER, 0, comm2d, ierr )
681	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr )
682
683	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
684
685	nx_o = nx
686	ny_o = ny
687
688	IF ( myid == 0 ) THEN
689
690	CALL MPI_RECV( nx_a, 1, MPI_INTEGER, 0, 1, comm_inter, status, &
691	ierr )
692	CALL MPI_RECV( ny_a, 1, MPI_INTEGER, 0, 2, comm_inter, status, &
693	ierr )
694	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, 0, 3, comm_inter, &
695	status, ierr )
696	CALL MPI_SEND( nx_o, 1, MPI_INTEGER, 0, 4, comm_inter, ierr )
697	CALL MPI_SEND( ny_o, 1, MPI_INTEGER, 0, 5, comm_inter, ierr )
698	CALL MPI_SEND( pdims, 2, MPI_INTEGER, 0, 6, comm_inter, ierr )
699	ENDIF
700
701	CALL MPI_BCAST( nx_a, 1, MPI_INTEGER, 0, comm2d, ierr)
702	CALL MPI_BCAST( ny_a, 1, MPI_INTEGER, 0, comm2d, ierr)
703	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr)
704
705	ENDIF
706
707	ngp_a = ( nx_a+1 + 2 * nbgp ) * ( ny_a+1 + 2 * nbgp )
708	ngp_o = ( nx_o+1 + 2 * nbgp ) * ( ny_o+1 + 2 * nbgp )
709
710	!
711	!-- Determine if the horizontal grid and the number of PEs in ocean and
712	!-- atmosphere is same or not
713	IF ( nx_o == nx_a .AND. ny_o == ny_a .AND. &
714	pdims(1) == pdims_remote(1) .AND. pdims(2) == pdims_remote(2) ) &
715	THEN
716	coupling_topology = 0
717	ELSE
718	coupling_topology = 1
719	ENDIF
720
721	!
722	!-- Determine the target PEs for the exchange between ocean and
723	!-- atmosphere (comm2d)
724	IF ( coupling_topology == 0 ) THEN
725	!
726	!-- In case of identical topologies, every atmosphere PE has exactly one
727	!-- ocean PE counterpart and vice versa
728	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
729	target_id = myid + numprocs
730	ELSE
731	target_id = myid
732	ENDIF
733
734	ELSE
735	!
736	!-- In case of nonequivalent topology in ocean and atmosphere only for
737	!-- PE0 in ocean and PE0 in atmosphere a target_id is needed, since
738	!-- data echxchange between ocean and atmosphere will be done only
739	!-- between these PEs.
740	IF ( myid == 0 ) THEN
741
742	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
743	target_id = numprocs
744	ELSE
745	target_id = 0
746	ENDIF
747
748	ENDIF
749
750	ENDIF
751
752	ENDIF
753
754
755	#endif
756
757	#else
758
759	!
760	!-- Array bounds when running on a single PE (respectively a non-parallel
761	!-- machine)
762	nxl = 0
763	nxr = nx
764	nxra = nx
765	nnx = nxr - nxl + 1
766	nys = 0
767	nyn = ny
768	nyna = ny
769	nny = nyn - nys + 1
770	nzb = 0
771	nzt = nz
772	nzta = nz
773	nnz = nz
774
775	ALLOCATE( hor_index_bounds(4,0:0) )
776	hor_index_bounds(1,0) = nxl
777	hor_index_bounds(2,0) = nxr
778	hor_index_bounds(3,0) = nys
779	hor_index_bounds(4,0) = nyn
780
781	!
782	!-- Array bounds for the pressure solver (in the parallel code, these bounds
783	!-- are the ones for the transposed arrays)
784	nys_x = nys
785	nyn_x = nyn
786	nyn_xa = nyn
787	nzb_x = nzb + 1
788	nzt_x = nzt
789	nzt_xa = nzt
790
791	nxl_y = nxl
792	nxr_y = nxr
793	nxr_ya = nxr
794	nzb_y = nzb + 1
795	nzt_y = nzt
796	nzt_ya = nzt
797
798	nxl_z = nxl
799	nxr_z = nxr
800	nxr_za = nxr
801	nys_z = nys
802	nyn_z = nyn
803	nyn_za = nyn
804
805	#endif
806
807	!
808	!-- Calculate number of grid levels necessary for the multigrid poisson solver
809	!-- as well as the gridpoint indices on each level
810	IF ( psolver == 'multigrid' ) THEN
811
812	!
813	!-- First calculate number of possible grid levels for the subdomains
814	mg_levels_x = 1
815	mg_levels_y = 1
816	mg_levels_z = 1
817
818	i = nnx
819	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
820	i = i / 2
821	mg_levels_x = mg_levels_x + 1
822	ENDDO
823
824	j = nny
825	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
826	j = j / 2
827	mg_levels_y = mg_levels_y + 1
828	ENDDO
829
830	k = nz ! do not use nnz because it might be > nz due to transposition
831	! requirements
832	DO WHILE ( MOD( k, 2 ) == 0 .AND. k /= 2 )
833	k = k / 2
834	mg_levels_z = mg_levels_z + 1
835	ENDDO
836
837	maximum_grid_level = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
838
839	!
840	!-- Find out, if the total domain allows more levels. These additional
841	!-- levels are identically processed on all PEs.
842	IF ( numprocs > 1 .AND. mg_switch_to_pe0_level /= -1 ) THEN
843
844	IF ( mg_levels_z > MIN( mg_levels_x, mg_levels_y ) ) THEN
845
846	mg_switch_to_pe0_level_l = maximum_grid_level
847
848	mg_levels_x = 1
849	mg_levels_y = 1
850
851	i = nx+1
852	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
853	i = i / 2
854	mg_levels_x = mg_levels_x + 1
855	ENDDO
856
857	j = ny+1
858	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
859	j = j / 2
860	mg_levels_y = mg_levels_y + 1
861	ENDDO
862
863	maximum_grid_level_l = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
864
865	IF ( maximum_grid_level_l > mg_switch_to_pe0_level_l ) THEN
866	mg_switch_to_pe0_level_l = maximum_grid_level_l - &
867	mg_switch_to_pe0_level_l + 1
868	ELSE
869	mg_switch_to_pe0_level_l = 0
870	ENDIF
871
872	ELSE
873
874	mg_switch_to_pe0_level_l = 0
875	maximum_grid_level_l = maximum_grid_level
876
877	ENDIF
878
879	!
880	!-- Use switch level calculated above only if it is not pre-defined
881	!-- by user
882	IF ( mg_switch_to_pe0_level == 0 ) THEN
883
884	IF ( mg_switch_to_pe0_level_l /= 0 ) THEN
885	mg_switch_to_pe0_level = mg_switch_to_pe0_level_l
886	maximum_grid_level = maximum_grid_level_l
887	ENDIF
888
889	ELSE
890	!
891	!-- Check pre-defined value and reset to default, if neccessary
892	IF ( mg_switch_to_pe0_level < mg_switch_to_pe0_level_l .OR. &
893	mg_switch_to_pe0_level >= maximum_grid_level_l ) THEN
894	message_string = 'mg_switch_to_pe0_level ' // &
895	'out of range and reset to default (=0)'
896	CALL message( 'init_pegrid', 'PA0235', 0, 1, 0, 6, 0 )
897	mg_switch_to_pe0_level = 0
898	ELSE
899	!
900	!-- Use the largest number of possible levels anyway and recalculate
901	!-- the switch level to this largest number of possible values
902	maximum_grid_level = maximum_grid_level_l
903
904	ENDIF
905
906	ENDIF
907
908	ENDIF
909
910	ALLOCATE( grid_level_count(maximum_grid_level), &
911	nxl_mg(maximum_grid_level), nxr_mg(maximum_grid_level), &
912	nyn_mg(maximum_grid_level), nys_mg(maximum_grid_level), &
913	nzt_mg(maximum_grid_level) )
914
915	grid_level_count = 0
916	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzt_l = nzt
917
918	DO i = maximum_grid_level, 1 , -1
919
920	IF ( i == mg_switch_to_pe0_level ) THEN
921	#if defined( __parallel )
922	!
923	!-- Save the grid size of the subdomain at the switch level, because
924	!-- it is needed in poismg.
925	ind(1) = nxl_l; ind(2) = nxr_l
926	ind(3) = nys_l; ind(4) = nyn_l
927	ind(5) = nzt_l
928	ALLOCATE( ind_all(5*numprocs), mg_loc_ind(5,0:numprocs-1) )
929	CALL MPI_ALLGATHER( ind, 5, MPI_INTEGER, ind_all, 5, &
930	MPI_INTEGER, comm2d, ierr )
931	DO j = 0, numprocs-1
932	DO k = 1, 5
933	mg_loc_ind(k,j) = ind_all(k+j*5)
934	ENDDO
935	ENDDO
936	DEALLOCATE( ind_all )
937	!
938	!-- Calculate the grid size of the total domain
939	nxr_l = ( nxr_l-nxl_l+1 ) * pdims(1) - 1
940	nxl_l = 0
941	nyn_l = ( nyn_l-nys_l+1 ) * pdims(2) - 1
942	nys_l = 0
943	!
944	!-- The size of this gathered array must not be larger than the
945	!-- array tend, which is used in the multigrid scheme as a temporary
946	!-- array
947	subdomain_size = ( nxr - nxl + 3 ) * ( nyn - nys + 3 ) * &
948	( nzt - nzb + 2 )
949	gathered_size = ( nxr_l - nxl_l + 3 ) * ( nyn_l - nys_l + 3 ) * &
950	( nzt_l - nzb + 2 )
951
952	IF ( gathered_size > subdomain_size ) THEN
953	message_string = 'not enough memory for storing ' // &
954	'gathered multigrid data on PE0'
955	CALL message( 'init_pegrid', 'PA0236', 1, 2, 0, 6, 0 )
956	ENDIF
957	#else
958	message_string = 'multigrid gather/scatter impossible ' // &
959	'in non parallel mode'
960	CALL message( 'init_pegrid', 'PA0237', 1, 2, 0, 6, 0 )
961	#endif
962	ENDIF
963
964	nxl_mg(i) = nxl_l
965	nxr_mg(i) = nxr_l
966	nys_mg(i) = nys_l
967	nyn_mg(i) = nyn_l
968	nzt_mg(i) = nzt_l
969
970	nxl_l = nxl_l / 2
971	nxr_l = nxr_l / 2
972	nys_l = nys_l / 2
973	nyn_l = nyn_l / 2
974	nzt_l = nzt_l / 2
975	ENDDO
976
977	ELSE
978
979	maximum_grid_level = 0
980
981	ENDIF
982
983	!
984	!-- Default level 0 tells exchange_horiz that all ghost planes have to be
985	!-- exchanged. grid_level is adjusted in poismg, where only one ghost plane
986	!-- is required.
987	grid_level = 0
988
989	#if defined( __parallel )
990	!
991	!-- Gridpoint number for the exchange of ghost points (y-line for 2D-arrays)
992	ngp_y = nyn - nys + 1 + 2 * nbgp
993
994	!
995	!-- Define new MPI derived datatypes for the exchange of ghost points in
996	!-- x- and y-direction for 2D-arrays (line)
997	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_REAL, type_x, &
998	ierr )
999	CALL MPI_TYPE_COMMIT( type_x, ierr )
1000	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_INTEGER, &
1001	type_x_int, ierr )
1002	CALL MPI_TYPE_COMMIT( type_x_int, ierr )
1003
1004	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_REAL, type_y, ierr )
1005	CALL MPI_TYPE_COMMIT( type_y, ierr )
1006	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_INTEGER, type_y_int, ierr )
1007	CALL MPI_TYPE_COMMIT( type_y_int, ierr )
1008
1009
1010	!
1011	!-- Calculate gridpoint numbers for the exchange of ghost points along x
1012	!-- (yz-plane for 3D-arrays) and define MPI derived data type(s) for the
1013	!-- exchange of ghost points in y-direction (xz-plane).
1014	!-- Do these calculations for the model grid and (if necessary) also
1015	!-- for the coarser grid levels used in the multigrid method
1016	ALLOCATE ( ngp_yz(0:maximum_grid_level), type_xz(0:maximum_grid_level),&
1017	type_yz(0:maximum_grid_level) )
1018
1019	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzb_l = nzb; nzt_l = nzt
1020
1021	!
1022	!-- Discern between the model grid, which needs nbgp ghost points and
1023	!-- grid levels for the multigrid scheme. In the latter case only one
1024	!-- ghost point is necessary.
1025	!-- First definition of MPI-datatypes for exchange of ghost layers on normal
1026	!-- grid. The following loop is needed for data exchange in poismg.f90.
1027	!
1028	!-- Determine number of grid points of yz-layer for exchange
1029	ngp_yz(0) = (nzt - nzb + 2) * (nyn - nys + 1 + 2 * nbgp)
1030
1031	!
1032	!-- Define an MPI-datatype for the exchange of left/right boundaries.
1033	!-- Although data are contiguous in physical memory (which does not
1034	!-- necessarily require an MPI-derived datatype), the data exchange between
1035	!-- left and right PE's using the MPI-derived type is 10% faster than without.
1036	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2nbgp, nbgp(nzt-nzb+2), ngp_yz(0), &
1037	MPI_REAL, type_xz(0), ierr )
1038	CALL MPI_TYPE_COMMIT( type_xz(0), ierr )
1039
1040	CALL MPI_TYPE_VECTOR( nbgp, ngp_yz(0), ngp_yz(0), MPI_REAL, type_yz(0), &
1041	ierr )
1042	CALL MPI_TYPE_COMMIT( type_yz(0), ierr )
1043
1044	!
1045	!-- Definition of MPI-datatypes for multigrid method (coarser level grids)
1046	IF ( psolver == 'multigrid' ) THEN
1047	!
1048	!-- Definition of MPI-datatyoe as above, but only 1 ghost level is used
1049	DO i = maximum_grid_level, 1 , -1
1050
1051	ngp_yz(i) = (nzt_l - nzb_l + 2) * (nyn_l - nys_l + 3)
1052
1053	CALL MPI_TYPE_VECTOR( nxr_l-nxl_l+3, nzt_l-nzb_l+2, ngp_yz(i), &
1054	MPI_REAL, type_xz(i), ierr )
1055	CALL MPI_TYPE_COMMIT( type_xz(i), ierr )
1056
1057	CALL MPI_TYPE_VECTOR( 1, ngp_yz(i), ngp_yz(i), MPI_REAL, type_yz(i), &
1058	ierr )
1059	CALL MPI_TYPE_COMMIT( type_yz(i), ierr )
1060
1061	nxl_l = nxl_l / 2
1062	nxr_l = nxr_l / 2
1063	nys_l = nys_l / 2
1064	nyn_l = nyn_l / 2
1065	nzt_l = nzt_l / 2
1066
1067	ENDDO
1068
1069	ENDIF
1070	#endif
1071
1072	#if defined( __parallel )
1073	!
1074	!-- Setting of flags for inflow/outflow conditions in case of non-cyclic
1075	!-- horizontal boundary conditions.
1076	IF ( pleft == MPI_PROC_NULL ) THEN
1077	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1078	inflow_l = .TRUE.
1079	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1080	outflow_l = .TRUE.
1081	ENDIF
1082	ENDIF
1083
1084	IF ( pright == MPI_PROC_NULL ) THEN
1085	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1086	outflow_r = .TRUE.
1087	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1088	inflow_r = .TRUE.
1089	ENDIF
1090	ENDIF
1091
1092	IF ( psouth == MPI_PROC_NULL ) THEN
1093	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1094	outflow_s = .TRUE.
1095	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1096	inflow_s = .TRUE.
1097	ENDIF
1098	ENDIF
1099
1100	IF ( pnorth == MPI_PROC_NULL ) THEN
1101	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1102	inflow_n = .TRUE.
1103	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1104	outflow_n = .TRUE.
1105	ENDIF
1106	ENDIF
1107
1108	!
1109	!-- Broadcast the id of the inflow PE
1110	IF ( inflow_l ) THEN
1111	id_inflow_l = myidx
1112	ELSE
1113	id_inflow_l = 0
1114	ENDIF
1115	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1116	CALL MPI_ALLREDUCE( id_inflow_l, id_inflow, 1, MPI_INTEGER, MPI_SUM, &
1117	comm1dx, ierr )
1118
1119	!
1120	!-- Broadcast the id of the recycling plane
1121	!-- WARNING: needs to be adjusted in case of inflows other than from left side!
1122	IF ( ( recycling_width / dx ) >= nxl .AND. &
1123	( recycling_width / dx ) <= nxr ) THEN
1124	id_recycling_l = myidx
1125	ELSE
1126	id_recycling_l = 0
1127	ENDIF
1128	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1129	CALL MPI_ALLREDUCE( id_recycling_l, id_recycling, 1, MPI_INTEGER, MPI_SUM, &
1130	comm1dx, ierr )
1131
1132	#else
1133	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1134	inflow_l = .TRUE.
1135	outflow_r = .TRUE.
1136	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1137	outflow_l = .TRUE.
1138	inflow_r = .TRUE.
1139	ENDIF
1140
1141	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1142	inflow_n = .TRUE.
1143	outflow_s = .TRUE.
1144	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1145	outflow_n = .TRUE.
1146	inflow_s = .TRUE.
1147	ENDIF
1148	#endif
1149	!
1150	!-- At the outflow, u or v, respectively, have to be calculated for one more
1151	!-- grid point.
1152	IF ( outflow_l ) THEN
1153	nxlu = nxl + 1
1154	ELSE
1155	nxlu = nxl
1156	ENDIF
1157	IF ( outflow_s ) THEN
1158	nysv = nys + 1
1159	ELSE
1160	nysv = nys
1161	ENDIF
1162
1163	IF ( psolver == 'poisfft_hybrid' ) THEN
1164	CALL poisfft_hybrid_ini
1165	ELSEIF ( psolver == 'poisfft' ) THEN
1166	CALL poisfft_init
1167	ENDIF
1168
1169	!
1170	!-- Allocate wall flag arrays used in the multigrid solver
1171	IF ( psolver == 'multigrid' ) THEN
1172
1173	DO i = maximum_grid_level, 1, -1
1174
1175	SELECT CASE ( i )
1176
1177	CASE ( 1 )
1178	ALLOCATE( wall_flags_1(nzb:nzt_mg(i)+1, &
1179	nys_mg(i)-1:nyn_mg(i)+1, &
1180	nxl_mg(i)-1:nxr_mg(i)+1) )
1181
1182	CASE ( 2 )
1183	ALLOCATE( wall_flags_2(nzb:nzt_mg(i)+1, &
1184	nys_mg(i)-1:nyn_mg(i)+1, &
1185	nxl_mg(i)-1:nxr_mg(i)+1) )
1186
1187	CASE ( 3 )
1188	ALLOCATE( wall_flags_3(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 ( 4 )
1193	ALLOCATE( wall_flags_4(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 ( 5 )
1198	ALLOCATE( wall_flags_5(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 ( 6 )
1203	ALLOCATE( wall_flags_6(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 ( 7 )
1208	ALLOCATE( wall_flags_7(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 ( 8 )
1213	ALLOCATE( wall_flags_8(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 ( 9 )
1218	ALLOCATE( wall_flags_9(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 ( 10 )
1223	ALLOCATE( wall_flags_10(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 DEFAULT
1228	message_string = 'more than 10 multigrid levels'
1229	CALL message( 'init_pegrid', 'PA0238', 1, 2, 0, 6, 0 )
1230
1231	END SELECT
1232
1233	ENDDO
1234
1235	ENDIF
1236
1237	END SUBROUTINE init_pegrid

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