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source: palm/trunk/SOURCE/init_pegrid.f90 @ 720

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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 710 2011-03-30 09:45:27Z gryschka $
14	!
15	! 709 2011-03-30 09:31:40Z raasch
16	! formatting adjustments
17	!
18	! 707 2011-03-29 11:39:40Z raasch
19	! bc_lr/ns replaced by bc_lr/ns_cyc/dirrad/raddir
20	!
21	! 667 2010-12-23 12:06:00Z suehring/gryschka
22	! Moved determination of target_id's from init_coupling
23	! Determination of parameters needed for coupling (coupling_topology, ngp_a,
24	! ngp_o) with different grid/processor-topology in ocean and atmosphere
25	! Adaption of ngp_xy, ngp_y to a dynamic number of ghost points.
26	! The maximum_grid_level changed from 1 to 0. 0 is the normal grid, 1 to
27	! maximum_grid_level the grids for multigrid, in which 0 and 1 are normal grids.
28	! This distinction is due to reasons of data exchange and performance for the
29	! normal grid and grids in poismg.
30	! The definition of MPI-Vectors adapted to a dynamic numer of ghost points.
31	! New MPI-Vectors for data exchange between left and right boundaries added.
32	! This is due to reasons of performance (10% faster).
33	!
34	! 646 2010-12-15 13:03:52Z raasch
35	! lctit is now using a 2d decomposition by default
36	!
37	! 622 2010-12-10 08:08:13Z raasch
38	! optional barriers included in order to speed up collective operations
39	!
40	! 438 2010-02-01 04:32:43Z raasch
41	! 2d-decomposition is default for Cray-XT machines
42	!
43	! 274 2009-03-26 15:11:21Z heinze
44	! Output of messages replaced by message handling routine.
45	!
46	! 206 2008-10-13 14:59:11Z raasch
47	! Implementation of a MPI-1 coupling: added __parallel within the __mpi2 part
48	! 2d-decomposition is default on SGI-ICE systems
49	!
50	! 197 2008-09-16 15:29:03Z raasch
51	! multigrid levels are limited by subdomains if mg_switch_to_pe0_level = -1,
52	! nz is used instead nnz for calculating mg-levels
53	! Collect on PE0 horizontal index bounds from all other PEs,
54	! broadcast the id of the inflow PE (using the respective communicator)
55	!
56	! 114 2007-10-10 00:03:15Z raasch
57	! Allocation of wall flag arrays for multigrid solver
58	!
59	! 108 2007-08-24 15:10:38Z letzel
60	! Intercommunicator (comm_inter) and derived data type (type_xy) for
61	! coupled model runs created, assign coupling_mode_remote,
62	! indices nxlu and nysv are calculated (needed for non-cyclic boundary
63	! conditions)
64	!
65	! 82 2007-04-16 15:40:52Z raasch
66	! Cpp-directive lcmuk changed to intel_openmp_bug, setting of host on lcmuk by
67	! cpp-directive removed
68	!
69	! 75 2007-03-22 09:54:05Z raasch
70	! uxrp, vynp eliminated,
71	! dirichlet/neumann changed to dirichlet/radiation, etc.,
72	! poisfft_init is only called if fft-solver is switched on
73	!
74	! RCS Log replace by Id keyword, revision history cleaned up
75	!
76	! Revision 1.28 2006/04/26 13:23:32 raasch
77	! lcmuk does not understand the !$ comment so a cpp-directive is required
78	!
79	! Revision 1.1 1997/07/24 11:15:09 raasch
80	! Initial revision
81	!
82	!
83	! Description:
84	! ------------
85	! Determination of the virtual processor topology (if not prescribed by the
86	! user)and computation of the grid point number and array bounds of the local
87	! domains.
88	!------------------------------------------------------------------------------!
89
90	USE control_parameters
91	USE fft_xy
92	USE grid_variables
93	USE indices
94	USE pegrid
95	USE poisfft_mod
96	USE poisfft_hybrid_mod
97	USE statistics
98	USE transpose_indices
99
100
101
102	IMPLICIT NONE
103
104	INTEGER :: gathered_size, i, id_inflow_l, id_recycling_l, ind(5), j, k, &
105	maximum_grid_level_l, mg_switch_to_pe0_level_l, mg_levels_x, &
106	mg_levels_y, mg_levels_z, nnx_y, nnx_z, nny_x, nny_z, nnz_x, &
107	nnz_y, numproc_sqr, nx_total, nxl_l, nxr_l, nyn_l, nys_l, &
108	nzb_l, nzt_l, omp_get_num_threads, subdomain_size
109
110	INTEGER, DIMENSION(:), ALLOCATABLE :: ind_all, nxlf, nxrf, nynf, nysf
111
112	INTEGER, DIMENSION(2) :: pdims_remote
113
114	LOGICAL :: found
115
116	!
117	!-- Get the number of OpenMP threads
118	!$OMP PARALLEL
119	#if defined( __intel_openmp_bug )
120	threads_per_task = omp_get_num_threads()
121	#else
122	!$ threads_per_task = omp_get_num_threads()
123	#endif
124	!$OMP END PARALLEL
125
126
127	#if defined( __parallel )
128
129	!
130	!-- Determine the processor topology or check it, if prescribed by the user
131	IF ( npex == -1 .AND. npey == -1 ) THEN
132
133	!
134	!-- Automatic determination of the topology
135	!-- The default on SMP- and cluster-hosts is a 1d-decomposition along x
136	IF ( host(1:3) == 'ibm' .OR. host(1:3) == 'nec' .OR. &
137	( host(1:2) == 'lc' .AND. host(3:5) /= 'sgi' .AND. &
138	host(3:4) /= 'xt' .AND. host(3:5) /= 'tit' ) .OR. &
139	host(1:3) == 'dec' ) THEN
140
141	pdims(1) = numprocs
142	pdims(2) = 1
143
144	ELSE
145
146	numproc_sqr = SQRT( REAL( numprocs ) )
147	pdims(1) = MAX( numproc_sqr , 1 )
148	DO WHILE ( MOD( numprocs , pdims(1) ) /= 0 )
149	pdims(1) = pdims(1) - 1
150	ENDDO
151	pdims(2) = numprocs / pdims(1)
152
153	ENDIF
154
155	ELSEIF ( npex /= -1 .AND. npey /= -1 ) THEN
156
157	!
158	!-- Prescribed by user. Number of processors on the prescribed topology
159	!-- must be equal to the number of PEs available to the job
160	IF ( ( npex * npey ) /= numprocs ) THEN
161	WRITE( message_string, * ) 'number of PEs of the prescribed ', &
162	'topology (', npex*npey,') does not match & the number of ', &
163	'PEs available to the job (', numprocs, ')'
164	CALL message( 'init_pegrid', 'PA0221', 1, 2, 0, 6, 0 )
165	ENDIF
166	pdims(1) = npex
167	pdims(2) = npey
168
169	ELSE
170	!
171	!-- If the processor topology is prescribed by the user, the number of
172	!-- PEs must be given in both directions
173	message_string = 'if the processor topology is prescribed by the, ' // &
174	' user& both values of "npex" and "npey" must be given ' // &
175	'in the &NAMELIST-parameter file'
176	CALL message( 'init_pegrid', 'PA0222', 1, 2, 0, 6, 0 )
177
178	ENDIF
179
180	!
181	!-- The hybrid solver can only be used in case of a 1d-decomposition along x
182	IF ( pdims(2) /= 1 .AND. psolver == 'poisfft_hybrid' ) THEN
183	message_string = 'psolver = "poisfft_hybrid" can only be' // &
184	'& used in case of a 1d-decomposition along x'
185	CALL message( 'init_pegrid', 'PA0223', 1, 2, 0, 6, 0 )
186	ENDIF
187
188	!
189	!-- For communication speedup, set barriers in front of collective
190	!-- communications by default on SGI-type systems
191	IF ( host(3:5) == 'sgi' ) collective_wait = .TRUE.
192
193	!
194	!-- If necessary, set horizontal boundary conditions to non-cyclic
195	IF ( .NOT. bc_lr_cyc ) cyclic(1) = .FALSE.
196	IF ( .NOT. bc_ns_cyc ) cyclic(2) = .FALSE.
197
198	!
199	!-- Create the virtual processor grid
200	CALL MPI_CART_CREATE( comm_palm, ndim, pdims, cyclic, reorder, &
201	comm2d, ierr )
202	CALL MPI_COMM_RANK( comm2d, myid, ierr )
203	WRITE (myid_char,'(''_'',I4.4)') myid
204
205	CALL MPI_CART_COORDS( comm2d, myid, ndim, pcoord, ierr )
206	CALL MPI_CART_SHIFT( comm2d, 0, 1, pleft, pright, ierr )
207	CALL MPI_CART_SHIFT( comm2d, 1, 1, psouth, pnorth, ierr )
208
209	!
210	!-- Determine sub-topologies for transpositions
211	!-- Transposition from z to x:
212	remain_dims(1) = .TRUE.
213	remain_dims(2) = .FALSE.
214	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dx, ierr )
215	CALL MPI_COMM_RANK( comm1dx, myidx, ierr )
216	!
217	!-- Transposition from x to y
218	remain_dims(1) = .FALSE.
219	remain_dims(2) = .TRUE.
220	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dy, ierr )
221	CALL MPI_COMM_RANK( comm1dy, myidy, ierr )
222
223
224	!
225	!-- Find a grid (used for array d) which will match the transposition demands
226	IF ( grid_matching == 'strict' ) THEN
227
228	nxa = nx; nya = ny; nza = nz
229
230	ELSE
231
232	found = .FALSE.
233	xn: DO nxa = nx, 2*nx
234	!
235	!-- Meet conditions for nx
236	IF ( MOD( nxa+1, pdims(1) ) /= 0 .OR. &
237	MOD( nxa+1, pdims(2) ) /= 0 ) CYCLE xn
238
239	yn: DO nya = ny, 2*ny
240	!
241	!-- Meet conditions for ny
242	IF ( MOD( nya+1, pdims(2) ) /= 0 .OR. &
243	MOD( nya+1, pdims(1) ) /= 0 ) CYCLE yn
244
245
246	zn: DO nza = nz, 2*nz
247	!
248	!-- Meet conditions for nz
249	IF ( ( MOD( nza, pdims(1) ) /= 0 .AND. pdims(1) /= 1 .AND. &
250	pdims(2) /= 1 ) .OR. &
251	( MOD( nza, pdims(2) ) /= 0 .AND. dt_dosp /= 9999999.9 &
252	) ) THEN
253	CYCLE zn
254	ELSE
255	found = .TRUE.
256	EXIT xn
257	ENDIF
258
259	ENDDO zn
260
261	ENDDO yn
262
263	ENDDO xn
264
265	IF ( .NOT. found ) THEN
266	message_string = 'no matching grid for transpositions found'
267	CALL message( 'init_pegrid', 'PA0224', 1, 2, 0, 6, 0 )
268	ENDIF
269
270	ENDIF
271
272	!
273	!-- Calculate array bounds in x-direction for every PE.
274	!-- The last PE along x may get less grid points than the others
275	ALLOCATE( nxlf(0:pdims(1)-1), nxrf(0:pdims(1)-1), nynf(0:pdims(2)-1), &
276	nysf(0:pdims(2)-1), nnx_pe(0:pdims(1)-1), nny_pe(0:pdims(2)-1) )
277
278	IF ( MOD( nxa+1 , pdims(1) ) /= 0 ) THEN
279	WRITE( message_string, * ) 'x-direction: gridpoint number (',nx+1,') ',&
280	'is not an& integral divisor of the number ', &
281	'processors (', pdims(1),')'
282	CALL message( 'init_pegrid', 'PA0225', 1, 2, 0, 6, 0 )
283	ELSE
284	nnx = ( nxa + 1 ) / pdims(1)
285	IF ( nnx*pdims(1) - ( nx + 1) > nnx ) THEN
286	WRITE( message_string, * ) 'x-direction: nx does not match the', &
287	'requirements given by the number of PEs &used', &
288	'& please use nx = ', nx - ( pdims(1) - ( nnx*pdims(1) &
289	- ( nx + 1 ) ) ), ' instead of nx =', nx
290	CALL message( 'init_pegrid', 'PA0226', 1, 2, 0, 6, 0 )
291	ENDIF
292	ENDIF
293
294	!
295	!-- Left and right array bounds, number of gridpoints
296	DO i = 0, pdims(1)-1
297	nxlf(i) = i * nnx
298	nxrf(i) = ( i + 1 ) * nnx - 1
299	nnx_pe(i) = MIN( nx, nxrf(i) ) - nxlf(i) + 1
300	ENDDO
301
302	!
303	!-- Calculate array bounds in y-direction for every PE.
304	IF ( MOD( nya+1 , pdims(2) ) /= 0 ) THEN
305	WRITE( message_string, * ) 'y-direction: gridpoint number (',ny+1,') ', &
306	'is not an& integral divisor of the number of', &
307	'processors (', pdims(2),')'
308	CALL message( 'init_pegrid', 'PA0227', 1, 2, 0, 6, 0 )
309	ELSE
310	nny = ( nya + 1 ) / pdims(2)
311	IF ( nny*pdims(2) - ( ny + 1) > nny ) THEN
312	WRITE( message_string, * ) 'y-direction: ny does not match the', &
313	'requirements given by the number of PEs &used ', &
314	'& please use ny = ', ny - ( pdims(2) - ( nnx*pdims(2) &
315	- ( ny + 1 ) ) ), ' instead of ny =', ny
316	CALL message( 'init_pegrid', 'PA0228', 1, 2, 0, 6, 0 )
317	ENDIF
318	ENDIF
319
320	!
321	!-- South and north array bounds
322	DO j = 0, pdims(2)-1
323	nysf(j) = j * nny
324	nynf(j) = ( j + 1 ) * nny - 1
325	nny_pe(j) = MIN( ny, nynf(j) ) - nysf(j) + 1
326	ENDDO
327
328	!
329	!-- Local array bounds of the respective PEs
330	nxl = nxlf(pcoord(1))
331	nxra = nxrf(pcoord(1))
332	nxr = MIN( nx, nxra )
333	nys = nysf(pcoord(2))
334	nyna = nynf(pcoord(2))
335	nyn = MIN( ny, nyna )
336	nzb = 0
337	nzta = nza
338	nzt = MIN( nz, nzta )
339	nnz = nza
340
341	!
342	!-- Set switches to define if the PE is situated at the border of the virtual
343	!-- processor grid
344	IF ( nxl == 0 ) left_border_pe = .TRUE.
345	IF ( nxr == nx ) right_border_pe = .TRUE.
346	IF ( nys == 0 ) south_border_pe = .TRUE.
347	IF ( nyn == ny ) north_border_pe = .TRUE.
348
349	!
350	!-- Calculate array bounds and gridpoint numbers for the transposed arrays
351	!-- (needed in the pressure solver)
352	!-- For the transposed arrays, cyclic boundaries as well as top and bottom
353	!-- boundaries are omitted, because they are obstructive to the transposition
354
355	!
356	!-- 1. transposition z --> x
357	!-- This transposition is not neccessary in case of a 1d-decomposition along x,
358	!-- except that the uptream-spline method is switched on
359	IF ( pdims(2) /= 1 .OR. momentum_advec == 'ups-scheme' .OR. &
360	scalar_advec == 'ups-scheme' ) THEN
361
362	IF ( pdims(2) == 1 .AND. ( momentum_advec == 'ups-scheme' .OR. &
363	scalar_advec == 'ups-scheme' ) ) THEN
364	message_string = '1d-decomposition along x ' // &
365	'chosen but nz restrictions may occur' // &
366	'& since ups-scheme is activated'
367	CALL message( 'init_pegrid', 'PA0229', 0, 1, 0, 6, 0 )
368	ENDIF
369	nys_x = nys
370	nyn_xa = nyna
371	nyn_x = nyn
372	nny_x = nny
373	IF ( MOD( nza , pdims(1) ) /= 0 ) THEN
374	WRITE( message_string, * ) 'transposition z --> x:', &
375	'&nz=',nz,' is not an integral divisior of pdims(1)=', &
376	pdims(1)
377	CALL message( 'init_pegrid', 'PA0230', 1, 2, 0, 6, 0 )
378	ENDIF
379	nnz_x = nza / pdims(1)
380	nzb_x = 1 + myidx * nnz_x
381	nzt_xa = ( myidx + 1 ) * nnz_x
382	nzt_x = MIN( nzt, nzt_xa )
383
384	sendrecvcount_zx = nnx * nny * nnz_x
385
386	ELSE
387	!
388	!--- Setting of dummy values because otherwise variables are undefined in
389	!--- the next step x --> y
390	!--- WARNING: This case has still to be clarified!!!!!!!!!!!!
391	nnz_x = 1
392	nzb_x = 1
393	nzt_xa = 1
394	nzt_x = 1
395	nny_x = nny
396
397	ENDIF
398
399	!
400	!-- 2. transposition x --> y
401	nnz_y = nnz_x
402	nzb_y = nzb_x
403	nzt_ya = nzt_xa
404	nzt_y = nzt_x
405	IF ( MOD( nxa+1 , pdims(2) ) /= 0 ) THEN
406	WRITE( message_string, * ) 'transposition x --> y:', &
407	'&nx+1=',nx+1,' is not an integral divisor of ',&
408	'pdims(2)=',pdims(2)
409	CALL message( 'init_pegrid', 'PA0231', 1, 2, 0, 6, 0 )
410	ENDIF
411	nnx_y = (nxa+1) / pdims(2)
412	nxl_y = myidy * nnx_y
413	nxr_ya = ( myidy + 1 ) * nnx_y - 1
414	nxr_y = MIN( nx, nxr_ya )
415
416	sendrecvcount_xy = nnx_y * nny_x * nnz_y
417
418	!
419	!-- 3. transposition y --> z (ELSE: x --> y in case of 1D-decomposition
420	!-- along x)
421	IF ( pdims(2) /= 1 .OR. momentum_advec == 'ups-scheme' .OR. &
422	scalar_advec == 'ups-scheme' ) THEN
423	!
424	!-- y --> z
425	!-- This transposition is not neccessary in case of a 1d-decomposition
426	!-- along x, except that the uptream-spline method is switched on
427	nnx_z = nnx_y
428	nxl_z = nxl_y
429	nxr_za = nxr_ya
430	nxr_z = nxr_y
431	IF ( MOD( nya+1 , pdims(1) ) /= 0 ) THEN
432	WRITE( message_string, * ) 'transposition y --> z:', &
433	'& ny+1=',ny+1,' is not an integral divisor of ',&
434	'pdims(1)=',pdims(1)
435	CALL message( 'init_pegrid', 'PA0232', 1, 2, 0, 6, 0 )
436	ENDIF
437	nny_z = (nya+1) / pdims(1)
438	nys_z = myidx * nny_z
439	nyn_za = ( myidx + 1 ) * nny_z - 1
440	nyn_z = MIN( ny, nyn_za )
441
442	sendrecvcount_yz = nnx_y * nny_z * nnz_y
443
444	ELSE
445	!
446	!-- x --> y. This condition must be fulfilled for a 1D-decomposition along x
447	IF ( MOD( nya+1 , pdims(1) ) /= 0 ) THEN
448	WRITE( message_string, * ) 'transposition x --> y:', &
449	'& ny+1=',ny+1,' is not an integral divisor of ',&
450	'pdims(1)=',pdims(1)
451	CALL message( 'init_pegrid', 'PA0233', 1, 2, 0, 6, 0 )
452	ENDIF
453
454	ENDIF
455
456	!
457	!-- Indices for direct transpositions z --> y (used for calculating spectra)
458	IF ( dt_dosp /= 9999999.9 ) THEN
459	IF ( MOD( nza, pdims(2) ) /= 0 ) THEN
460	WRITE( message_string, * ) 'direct transposition z --> y (needed ', &
461	'for spectra):& nz=',nz,' is not an integral divisor of ',&
462	'pdims(2)=',pdims(2)
463	CALL message( 'init_pegrid', 'PA0234', 1, 2, 0, 6, 0 )
464	ELSE
465	nxl_yd = nxl
466	nxr_yda = nxra
467	nxr_yd = nxr
468	nzb_yd = 1 + myidy * ( nza / pdims(2) )
469	nzt_yda = ( myidy + 1 ) * ( nza / pdims(2) )
470	nzt_yd = MIN( nzt, nzt_yda )
471
472	sendrecvcount_zyd = nnx * nny * ( nza / pdims(2) )
473	ENDIF
474	ENDIF
475
476	!
477	!-- Indices for direct transpositions y --> x (they are only possible in case
478	!-- of a 1d-decomposition along x)
479	IF ( pdims(2) == 1 ) THEN
480	nny_x = nny / pdims(1)
481	nys_x = myid * nny_x
482	nyn_xa = ( myid + 1 ) * nny_x - 1
483	nyn_x = MIN( ny, nyn_xa )
484	nzb_x = 1
485	nzt_xa = nza
486	nzt_x = nz
487	sendrecvcount_xy = nnx * nny_x * nza
488	ENDIF
489
490	!
491	!-- Indices for direct transpositions x --> y (they are only possible in case
492	!-- of a 1d-decomposition along y)
493	IF ( pdims(1) == 1 ) THEN
494	nnx_y = nnx / pdims(2)
495	nxl_y = myid * nnx_y
496	nxr_ya = ( myid + 1 ) * nnx_y - 1
497	nxr_y = MIN( nx, nxr_ya )
498	nzb_y = 1
499	nzt_ya = nza
500	nzt_y = nz
501	sendrecvcount_xy = nnx_y * nny * nza
502	ENDIF
503
504	!
505	!-- Arrays for storing the array bounds are needed any more
506	DEALLOCATE( nxlf , nxrf , nynf , nysf )
507
508	!
509	!-- Collect index bounds from other PEs (to be written to restart file later)
510	ALLOCATE( hor_index_bounds(4,0:numprocs-1) )
511
512	IF ( myid == 0 ) THEN
513
514	hor_index_bounds(1,0) = nxl
515	hor_index_bounds(2,0) = nxr
516	hor_index_bounds(3,0) = nys
517	hor_index_bounds(4,0) = nyn
518
519	!
520	!-- Receive data from all other PEs
521	DO i = 1, numprocs-1
522	CALL MPI_RECV( ibuf, 4, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
523	ierr )
524	hor_index_bounds(:,i) = ibuf(1:4)
525	ENDDO
526
527	ELSE
528	!
529	!-- Send index bounds to PE0
530	ibuf(1) = nxl
531	ibuf(2) = nxr
532	ibuf(3) = nys
533	ibuf(4) = nyn
534	CALL MPI_SEND( ibuf, 4, MPI_INTEGER, 0, myid, comm2d, ierr )
535
536	ENDIF
537
538	#if defined( __print )
539	!
540	!-- Control output
541	IF ( myid == 0 ) THEN
542	PRINT, ' processor topology *'
543	PRINT*, ' '
544	PRINT*, 'myid pcoord left right south north idx idy nxl: nxr',&
545	&' nys: nyn'
546	PRINT*, '------------------------------------------------------------',&
547	&'-----------'
548	WRITE (*,1000) 0, pcoord(1), pcoord(2), pleft, pright, psouth, pnorth, &
549	myidx, myidy, nxl, nxr, nys, nyn
550	1000 FORMAT (I4,2X,'(',I3,',',I3,')',3X,I4,2X,I4,3X,I4,2X,I4,2X,I3,1X,I3, &
551	2(2X,I4,':',I4))
552
553	!
554	!-- Receive data from the other PEs
555	DO i = 1,numprocs-1
556	CALL MPI_RECV( ibuf, 12, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
557	ierr )
558	WRITE (*,1000) i, ( ibuf(j) , j = 1,12 )
559	ENDDO
560	ELSE
561
562	!
563	!-- Send data to PE0
564	ibuf(1) = pcoord(1); ibuf(2) = pcoord(2); ibuf(3) = pleft
565	ibuf(4) = pright; ibuf(5) = psouth; ibuf(6) = pnorth; ibuf(7) = myidx
566	ibuf(8) = myidy; ibuf(9) = nxl; ibuf(10) = nxr; ibuf(11) = nys
567	ibuf(12) = nyn
568	CALL MPI_SEND( ibuf, 12, MPI_INTEGER, 0, myid, comm2d, ierr )
569	ENDIF
570	#endif
571
572	#if defined( __parallel )
573	#if defined( __mpi2 )
574	!
575	!-- In case of coupled runs, get the port name on PE0 of the atmosphere model
576	!-- and pass it to PE0 of the ocean model
577	IF ( myid == 0 ) THEN
578
579	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
580
581	CALL MPI_OPEN_PORT( MPI_INFO_NULL, port_name, ierr )
582
583	CALL MPI_PUBLISH_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, &
584	ierr )
585
586	!
587	!-- Write a flag file for the ocean model and the other atmosphere
588	!-- processes.
589	!-- There seems to be a bug in MPICH2 which causes hanging processes
590	!-- in case that execution of LOOKUP_NAME is continued too early
591	!-- (i.e. before the port has been created)
592	OPEN( 90, FILE='COUPLING_PORT_OPENED', FORM='FORMATTED' )
593	WRITE ( 90, '(''TRUE'')' )
594	CLOSE ( 90 )
595
596	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
597
598	!
599	!-- Continue only if the atmosphere model has created the port.
600	!-- There seems to be a bug in MPICH2 which causes hanging processes
601	!-- in case that execution of LOOKUP_NAME is continued too early
602	!-- (i.e. before the port has been created)
603	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
604	DO WHILE ( .NOT. found )
605	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
606	ENDDO
607
608	CALL MPI_LOOKUP_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, ierr )
609
610	ENDIF
611
612	ENDIF
613
614	!
615	!-- In case of coupled runs, establish the connection between the atmosphere
616	!-- and the ocean model and define the intercommunicator (comm_inter)
617	CALL MPI_BARRIER( comm2d, ierr )
618	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
619
620	CALL MPI_COMM_ACCEPT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
621	comm_inter, ierr )
622	coupling_mode_remote = 'ocean_to_atmosphere'
623
624	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
625
626	CALL MPI_COMM_CONNECT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
627	comm_inter, ierr )
628	coupling_mode_remote = 'atmosphere_to_ocean'
629
630	ENDIF
631	#endif
632
633	!
634	!-- Determine the number of ghost point layers
635	IF ( scalar_advec == 'ws-scheme' .OR. momentum_advec == 'ws-scheme' ) THEN
636	nbgp = 3
637	ELSE
638	nbgp = 1
639	ENDIF
640
641	!
642	!-- Create a new MPI derived datatype for the exchange of surface (xy) data,
643	!-- which is needed for coupled atmosphere-ocean runs.
644	!-- First, calculate number of grid points of an xy-plane.
645	ngp_xy = ( nxr - nxl + 1 + 2 * nbgp ) * ( nyn - nys + 1 + 2 * nbgp )
646	CALL MPI_TYPE_VECTOR( ngp_xy, 1, nzt-nzb+2, MPI_REAL, type_xy, ierr )
647	CALL MPI_TYPE_COMMIT( type_xy, ierr )
648
649	IF ( TRIM( coupling_mode ) /= 'uncoupled' ) THEN
650
651	!
652	!-- Pass the number of grid points of the atmosphere model to
653	!-- the ocean model and vice versa
654	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
655
656	nx_a = nx
657	ny_a = ny
658
659	IF ( myid == 0 ) THEN
660
661	CALL MPI_SEND( nx_a, 1, MPI_INTEGER, numprocs, 1, comm_inter, &
662	ierr )
663	CALL MPI_SEND( ny_a, 1, MPI_INTEGER, numprocs, 2, comm_inter, &
664	ierr )
665	CALL MPI_SEND( pdims, 2, MPI_INTEGER, numprocs, 3, comm_inter, &
666	ierr )
667	CALL MPI_RECV( nx_o, 1, MPI_INTEGER, numprocs, 4, comm_inter, &
668	status, ierr )
669	CALL MPI_RECV( ny_o, 1, MPI_INTEGER, numprocs, 5, comm_inter, &
670	status, ierr )
671	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, numprocs, 6, &
672	comm_inter, status, ierr )
673	ENDIF
674
675	CALL MPI_BCAST( nx_o, 1, MPI_INTEGER, 0, comm2d, ierr )
676	CALL MPI_BCAST( ny_o, 1, MPI_INTEGER, 0, comm2d, ierr )
677	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr )
678
679	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
680
681	nx_o = nx
682	ny_o = ny
683
684	IF ( myid == 0 ) THEN
685
686	CALL MPI_RECV( nx_a, 1, MPI_INTEGER, 0, 1, comm_inter, status, &
687	ierr )
688	CALL MPI_RECV( ny_a, 1, MPI_INTEGER, 0, 2, comm_inter, status, &
689	ierr )
690	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, 0, 3, comm_inter, &
691	status, ierr )
692	CALL MPI_SEND( nx_o, 1, MPI_INTEGER, 0, 4, comm_inter, ierr )
693	CALL MPI_SEND( ny_o, 1, MPI_INTEGER, 0, 5, comm_inter, ierr )
694	CALL MPI_SEND( pdims, 2, MPI_INTEGER, 0, 6, comm_inter, ierr )
695	ENDIF
696
697	CALL MPI_BCAST( nx_a, 1, MPI_INTEGER, 0, comm2d, ierr)
698	CALL MPI_BCAST( ny_a, 1, MPI_INTEGER, 0, comm2d, ierr)
699	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr)
700
701	ENDIF
702
703	ngp_a = ( nx_a+1 + 2 * nbgp ) * ( ny_a+1 + 2 * nbgp )
704	ngp_o = ( nx_o+1 + 2 * nbgp ) * ( ny_o+1 + 2 * nbgp )
705
706	!
707	!-- Determine if the horizontal grid and the number of PEs in ocean and
708	!-- atmosphere is same or not
709	IF ( nx_o == nx_a .AND. ny_o == ny_a .AND. &
710	pdims(1) == pdims_remote(1) .AND. pdims(2) == pdims_remote(2) ) &
711	THEN
712	coupling_topology = 0
713	ELSE
714	coupling_topology = 1
715	ENDIF
716
717	!
718	!-- Determine the target PEs for the exchange between ocean and
719	!-- atmosphere (comm2d)
720	IF ( coupling_topology == 0 ) THEN
721	!
722	!-- In case of identical topologies, every atmosphere PE has exactly one
723	!-- ocean PE counterpart and vice versa
724	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
725	target_id = myid + numprocs
726	ELSE
727	target_id = myid
728	ENDIF
729
730	ELSE
731	!
732	!-- In case of nonequivalent topology in ocean and atmosphere only for
733	!-- PE0 in ocean and PE0 in atmosphere a target_id is needed, since
734	!-- data echxchange between ocean and atmosphere will be done only
735	!-- between these PEs.
736	IF ( myid == 0 ) THEN
737
738	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
739	target_id = numprocs
740	ELSE
741	target_id = 0
742	ENDIF
743
744	ENDIF
745
746	ENDIF
747
748	ENDIF
749
750
751	#endif
752
753	#else
754
755	!
756	!-- Array bounds when running on a single PE (respectively a non-parallel
757	!-- machine)
758	nxl = 0
759	nxr = nx
760	nxra = nx
761	nnx = nxr - nxl + 1
762	nys = 0
763	nyn = ny
764	nyna = ny
765	nny = nyn - nys + 1
766	nzb = 0
767	nzt = nz
768	nzta = nz
769	nnz = nz
770
771	ALLOCATE( hor_index_bounds(4,0:0) )
772	hor_index_bounds(1,0) = nxl
773	hor_index_bounds(2,0) = nxr
774	hor_index_bounds(3,0) = nys
775	hor_index_bounds(4,0) = nyn
776
777	!
778	!-- Array bounds for the pressure solver (in the parallel code, these bounds
779	!-- are the ones for the transposed arrays)
780	nys_x = nys
781	nyn_x = nyn
782	nyn_xa = nyn
783	nzb_x = nzb + 1
784	nzt_x = nzt
785	nzt_xa = nzt
786
787	nxl_y = nxl
788	nxr_y = nxr
789	nxr_ya = nxr
790	nzb_y = nzb + 1
791	nzt_y = nzt
792	nzt_ya = nzt
793
794	nxl_z = nxl
795	nxr_z = nxr
796	nxr_za = nxr
797	nys_z = nys
798	nyn_z = nyn
799	nyn_za = nyn
800
801	#endif
802
803	!
804	!-- Calculate number of grid levels necessary for the multigrid poisson solver
805	!-- as well as the gridpoint indices on each level
806	IF ( psolver == 'multigrid' ) THEN
807
808	!
809	!-- First calculate number of possible grid levels for the subdomains
810	mg_levels_x = 1
811	mg_levels_y = 1
812	mg_levels_z = 1
813
814	i = nnx
815	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
816	i = i / 2
817	mg_levels_x = mg_levels_x + 1
818	ENDDO
819
820	j = nny
821	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
822	j = j / 2
823	mg_levels_y = mg_levels_y + 1
824	ENDDO
825
826	k = nz ! do not use nnz because it might be > nz due to transposition
827	! requirements
828	DO WHILE ( MOD( k, 2 ) == 0 .AND. k /= 2 )
829	k = k / 2
830	mg_levels_z = mg_levels_z + 1
831	ENDDO
832
833	maximum_grid_level = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
834
835	!
836	!-- Find out, if the total domain allows more levels. These additional
837	!-- levels are identically processed on all PEs.
838	IF ( numprocs > 1 .AND. mg_switch_to_pe0_level /= -1 ) THEN
839
840	IF ( mg_levels_z > MIN( mg_levels_x, mg_levels_y ) ) THEN
841
842	mg_switch_to_pe0_level_l = maximum_grid_level
843
844	mg_levels_x = 1
845	mg_levels_y = 1
846
847	i = nx+1
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 = ny+1
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	maximum_grid_level_l = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
860
861	IF ( maximum_grid_level_l > mg_switch_to_pe0_level_l ) THEN
862	mg_switch_to_pe0_level_l = maximum_grid_level_l - &
863	mg_switch_to_pe0_level_l + 1
864	ELSE
865	mg_switch_to_pe0_level_l = 0
866	ENDIF
867
868	ELSE
869
870	mg_switch_to_pe0_level_l = 0
871	maximum_grid_level_l = maximum_grid_level
872
873	ENDIF
874
875	!
876	!-- Use switch level calculated above only if it is not pre-defined
877	!-- by user
878	IF ( mg_switch_to_pe0_level == 0 ) THEN
879
880	IF ( mg_switch_to_pe0_level_l /= 0 ) THEN
881	mg_switch_to_pe0_level = mg_switch_to_pe0_level_l
882	maximum_grid_level = maximum_grid_level_l
883	ENDIF
884
885	ELSE
886	!
887	!-- Check pre-defined value and reset to default, if neccessary
888	IF ( mg_switch_to_pe0_level < mg_switch_to_pe0_level_l .OR. &
889	mg_switch_to_pe0_level >= maximum_grid_level_l ) THEN
890	message_string = 'mg_switch_to_pe0_level ' // &
891	'out of range and reset to default (=0)'
892	CALL message( 'init_pegrid', 'PA0235', 0, 1, 0, 6, 0 )
893	mg_switch_to_pe0_level = 0
894	ELSE
895	!
896	!-- Use the largest number of possible levels anyway and recalculate
897	!-- the switch level to this largest number of possible values
898	maximum_grid_level = maximum_grid_level_l
899
900	ENDIF
901
902	ENDIF
903
904	ENDIF
905
906	ALLOCATE( grid_level_count(maximum_grid_level), &
907	nxl_mg(maximum_grid_level), nxr_mg(maximum_grid_level), &
908	nyn_mg(maximum_grid_level), nys_mg(maximum_grid_level), &
909	nzt_mg(maximum_grid_level) )
910
911	grid_level_count = 0
912	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzt_l = nzt
913
914	DO i = maximum_grid_level, 1 , -1
915
916	IF ( i == mg_switch_to_pe0_level ) THEN
917	#if defined( __parallel )
918	!
919	!-- Save the grid size of the subdomain at the switch level, because
920	!-- it is needed in poismg.
921	ind(1) = nxl_l; ind(2) = nxr_l
922	ind(3) = nys_l; ind(4) = nyn_l
923	ind(5) = nzt_l
924	ALLOCATE( ind_all(5*numprocs), mg_loc_ind(5,0:numprocs-1) )
925	CALL MPI_ALLGATHER( ind, 5, MPI_INTEGER, ind_all, 5, &
926	MPI_INTEGER, comm2d, ierr )
927	DO j = 0, numprocs-1
928	DO k = 1, 5
929	mg_loc_ind(k,j) = ind_all(k+j*5)
930	ENDDO
931	ENDDO
932	DEALLOCATE( ind_all )
933	!
934	!-- Calculate the grid size of the total domain
935	nxr_l = ( nxr_l-nxl_l+1 ) * pdims(1) - 1
936	nxl_l = 0
937	nyn_l = ( nyn_l-nys_l+1 ) * pdims(2) - 1
938	nys_l = 0
939	!
940	!-- The size of this gathered array must not be larger than the
941	!-- array tend, which is used in the multigrid scheme as a temporary
942	!-- array
943	subdomain_size = ( nxr - nxl + 3 ) * ( nyn - nys + 3 ) * &
944	( nzt - nzb + 2 )
945	gathered_size = ( nxr_l - nxl_l + 3 ) * ( nyn_l - nys_l + 3 ) * &
946	( nzt_l - nzb + 2 )
947
948	IF ( gathered_size > subdomain_size ) THEN
949	message_string = 'not enough memory for storing ' // &
950	'gathered multigrid data on PE0'
951	CALL message( 'init_pegrid', 'PA0236', 1, 2, 0, 6, 0 )
952	ENDIF
953	#else
954	message_string = 'multigrid gather/scatter impossible ' // &
955	'in non parallel mode'
956	CALL message( 'init_pegrid', 'PA0237', 1, 2, 0, 6, 0 )
957	#endif
958	ENDIF
959
960	nxl_mg(i) = nxl_l
961	nxr_mg(i) = nxr_l
962	nys_mg(i) = nys_l
963	nyn_mg(i) = nyn_l
964	nzt_mg(i) = nzt_l
965
966	nxl_l = nxl_l / 2
967	nxr_l = nxr_l / 2
968	nys_l = nys_l / 2
969	nyn_l = nyn_l / 2
970	nzt_l = nzt_l / 2
971	ENDDO
972
973	ELSE
974
975	maximum_grid_level = 0
976
977	ENDIF
978
979	grid_level = maximum_grid_level
980
981	#if defined( __parallel )
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_yz(0:maximum_grid_level), type_xz(0:maximum_grid_level),&
1009	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 == '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_yz(i) = (nzt_l - nzb_l + 2) * (nyn_l - nys_l + 3)
1044
1045	CALL MPI_TYPE_VECTOR( nxr_l-nxl_l+3, nzt_l-nzb_l+2, ngp_yz(i), &
1046	MPI_REAL, type_xz(i), ierr )
1047	CALL MPI_TYPE_COMMIT( type_xz(i), ierr )
1048
1049	CALL MPI_TYPE_VECTOR( 1, ngp_yz(i), ngp_yz(i), MPI_REAL, type_yz(i), &
1050	ierr )
1051	CALL MPI_TYPE_COMMIT( type_yz(i), ierr )
1052
1053	nxl_l = nxl_l / 2
1054	nxr_l = nxr_l / 2
1055	nys_l = nys_l / 2
1056	nyn_l = nyn_l / 2
1057	nzt_l = nzt_l / 2
1058
1059	ENDDO
1060
1061	ENDIF
1062	#endif
1063
1064	#if defined( __parallel )
1065	!
1066	!-- Setting of flags for inflow/outflow conditions in case of non-cyclic
1067	!-- horizontal boundary conditions.
1068	IF ( pleft == MPI_PROC_NULL ) THEN
1069	IF ( bc_lr_dirrad ) THEN
1070	inflow_l = .TRUE.
1071	ELSEIF ( bc_lr_raddir ) THEN
1072	outflow_l = .TRUE.
1073	ENDIF
1074	ENDIF
1075
1076	IF ( pright == MPI_PROC_NULL ) THEN
1077	IF ( bc_lr_dirrad ) THEN
1078	outflow_r = .TRUE.
1079	ELSEIF ( bc_lr_raddir ) THEN
1080	inflow_r = .TRUE.
1081	ENDIF
1082	ENDIF
1083
1084	IF ( psouth == MPI_PROC_NULL ) THEN
1085	IF ( bc_ns_dirrad ) THEN
1086	outflow_s = .TRUE.
1087	ELSEIF ( bc_ns_raddir ) THEN
1088	inflow_s = .TRUE.
1089	ENDIF
1090	ENDIF
1091
1092	IF ( pnorth == MPI_PROC_NULL ) THEN
1093	IF ( bc_ns_dirrad ) THEN
1094	inflow_n = .TRUE.
1095	ELSEIF ( bc_ns_raddir ) THEN
1096	outflow_n = .TRUE.
1097	ENDIF
1098	ENDIF
1099
1100	!
1101	!-- Broadcast the id of the inflow PE
1102	IF ( inflow_l ) THEN
1103	id_inflow_l = myidx
1104	ELSE
1105	id_inflow_l = 0
1106	ENDIF
1107	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1108	CALL MPI_ALLREDUCE( id_inflow_l, id_inflow, 1, MPI_INTEGER, MPI_SUM, &
1109	comm1dx, ierr )
1110
1111	!
1112	!-- Broadcast the id of the recycling plane
1113	!-- WARNING: needs to be adjusted in case of inflows other than from left side!
1114	IF ( ( recycling_width / dx ) >= nxl .AND. &
1115	( recycling_width / dx ) <= nxr ) THEN
1116	id_recycling_l = myidx
1117	ELSE
1118	id_recycling_l = 0
1119	ENDIF
1120	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1121	CALL MPI_ALLREDUCE( id_recycling_l, id_recycling, 1, MPI_INTEGER, MPI_SUM, &
1122	comm1dx, ierr )
1123
1124	#else
1125	IF ( bc_lr_dirrad ) THEN
1126	inflow_l = .TRUE.
1127	outflow_r = .TRUE.
1128	ELSEIF ( bc_lr_raddir ) THEN
1129	outflow_l = .TRUE.
1130	inflow_r = .TRUE.
1131	ENDIF
1132
1133	IF ( bc_ns_dirrad ) THEN
1134	inflow_n = .TRUE.
1135	outflow_s = .TRUE.
1136	ELSEIF ( bc_ns_raddir ) THEN
1137	outflow_n = .TRUE.
1138	inflow_s = .TRUE.
1139	ENDIF
1140	#endif
1141	!
1142	!-- At the outflow, u or v, respectively, have to be calculated for one more
1143	!-- grid point.
1144	IF ( outflow_l ) THEN
1145	nxlu = nxl + 1
1146	ELSE
1147	nxlu = nxl
1148	ENDIF
1149	IF ( outflow_s ) THEN
1150	nysv = nys + 1
1151	ELSE
1152	nysv = nys
1153	ENDIF
1154
1155	IF ( psolver == 'poisfft_hybrid' ) THEN
1156	CALL poisfft_hybrid_ini
1157	ELSEIF ( psolver == 'poisfft' ) THEN
1158	CALL poisfft_init
1159	ENDIF
1160
1161	!
1162	!-- Allocate wall flag arrays used in the multigrid solver
1163	IF ( psolver == 'multigrid' ) THEN
1164
1165	DO i = maximum_grid_level, 1, -1
1166
1167	SELECT CASE ( i )
1168
1169	CASE ( 1 )
1170	ALLOCATE( wall_flags_1(nzb:nzt_mg(i)+1, &
1171	nys_mg(i)-1:nyn_mg(i)+1, &
1172	nxl_mg(i)-1:nxr_mg(i)+1) )
1173
1174	CASE ( 2 )
1175	ALLOCATE( wall_flags_2(nzb:nzt_mg(i)+1, &
1176	nys_mg(i)-1:nyn_mg(i)+1, &
1177	nxl_mg(i)-1:nxr_mg(i)+1) )
1178
1179	CASE ( 3 )
1180	ALLOCATE( wall_flags_3(nzb:nzt_mg(i)+1, &
1181	nys_mg(i)-1:nyn_mg(i)+1, &
1182	nxl_mg(i)-1:nxr_mg(i)+1) )
1183
1184	CASE ( 4 )
1185	ALLOCATE( wall_flags_4(nzb:nzt_mg(i)+1, &
1186	nys_mg(i)-1:nyn_mg(i)+1, &
1187	nxl_mg(i)-1:nxr_mg(i)+1) )
1188
1189	CASE ( 5 )
1190	ALLOCATE( wall_flags_5(nzb:nzt_mg(i)+1, &
1191	nys_mg(i)-1:nyn_mg(i)+1, &
1192	nxl_mg(i)-1:nxr_mg(i)+1) )
1193
1194	CASE ( 6 )
1195	ALLOCATE( wall_flags_6(nzb:nzt_mg(i)+1, &
1196	nys_mg(i)-1:nyn_mg(i)+1, &
1197	nxl_mg(i)-1:nxr_mg(i)+1) )
1198
1199	CASE ( 7 )
1200	ALLOCATE( wall_flags_7(nzb:nzt_mg(i)+1, &
1201	nys_mg(i)-1:nyn_mg(i)+1, &
1202	nxl_mg(i)-1:nxr_mg(i)+1) )
1203
1204	CASE ( 8 )
1205	ALLOCATE( wall_flags_8(nzb:nzt_mg(i)+1, &
1206	nys_mg(i)-1:nyn_mg(i)+1, &
1207	nxl_mg(i)-1:nxr_mg(i)+1) )
1208
1209	CASE ( 9 )
1210	ALLOCATE( wall_flags_9(nzb:nzt_mg(i)+1, &
1211	nys_mg(i)-1:nyn_mg(i)+1, &
1212	nxl_mg(i)-1:nxr_mg(i)+1) )
1213
1214	CASE ( 10 )
1215	ALLOCATE( wall_flags_10(nzb:nzt_mg(i)+1, &
1216	nys_mg(i)-1:nyn_mg(i)+1, &
1217	nxl_mg(i)-1:nxr_mg(i)+1) )
1218
1219	CASE DEFAULT
1220	message_string = 'more than 10 multigrid levels'
1221	CALL message( 'init_pegrid', 'PA0238', 1, 2, 0, 6, 0 )
1222
1223	END SELECT
1224
1225	ENDDO
1226
1227	ENDIF
1228
1229	END SUBROUTINE init_pegrid

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