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source: palm/trunk/SOURCE/init_pegrid.f90 @ 1557

Last change on this file since 1557 was 1557, checked in by suehring, 9 years ago
Enable monotone advection for scalars in combination with fifth-order scheme using monotonic limiter.
Property svn:keywords set to `Id`
File size: 41.3 KB

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

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