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source: palm/trunk/SOURCE/init_pegrid.f90 @ 1598

Last change on this file since 1598 was 1576, checked in by raasch, 10 years ago
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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	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: init_pegrid.f90 1576 2015-03-27 10:23:30Z raasch $
27	!
28	! 1575 2015-03-27 09:56:27Z raasch
29	! adjustments for psolver-queries, calculation of ngp_xz added
30	!
31	! 1565 2015-03-09 20:59:31Z suehring
32	! Refine if-clause for setting nbgp.
33	!
34	! 1557 2015-03-05 16:43:04Z suehring
35	! Adjustment for monotonic limiter
36	!
37	! 1468 2014-09-24 14:06:57Z maronga
38	! Adapted for use on up to 6-digit processor cores
39	!
40	! 1435 2014-07-21 10:37:02Z keck
41	! bugfix: added missing parameter coupling_mode_remote to ONLY-attribute
42	!
43	! 1402 2014-05-09 14:25:13Z raasch
44	! location messages modified
45	!
46	! 1384 2014-05-02 14:31:06Z raasch
47	! location messages added
48	!
49	! 1353 2014-04-08 15:21:23Z heinze
50	! REAL constants provided with KIND-attribute
51	!
52	! 1322 2014-03-20 16:38:49Z raasch
53	! REAL functions provided with KIND-attribute
54	!
55	! 1320 2014-03-20 08:40:49Z raasch
56	! ONLY-attribute added to USE-statements,
57	! kind-parameters added to all INTEGER and REAL declaration statements,
58	! kinds are defined in new module kinds,
59	! revision history before 2012 removed,
60	! comment fields (!:) to be used for variable explanations added to
61	! all variable declaration statements
62	!
63	! 1304 2014-03-12 10:29:42Z raasch
64	! bugfix: single core MPI runs missed some settings of transpose indices
65	!
66	! 1212 2013-08-15 08:46:27Z raasch
67	! error message for poisfft_hybrid removed
68	!
69	! 1159 2013-05-21 11:58:22Z fricke
70	! dirichlet/neumann and neumann/dirichlet removed
71	!
72	! 1139 2013-04-18 07:25:03Z raasch
73	! bugfix for calculating the id of the PE carrying the recycling plane
74	!
75	! 1111 2013-03-08 23:54:10Z raasch
76	! initialization of poisfft moved to module poisfft
77	!
78	! 1092 2013-02-02 11:24:22Z raasch
79	! unused variables removed
80	!
81	! 1056 2012-11-16 15:28:04Z raasch
82	! Indices for arrays n.._mg start from zero due to definition of arrays f2 and
83	! p2 as automatic arrays in recursive subroutine next_mg_level
84	!
85	! 1041 2012-11-06 02:36:29Z raasch
86	! a 2d virtual processor topology is used by default for all machines
87	!
88	! 1036 2012-10-22 13:43:42Z raasch
89	! code put under GPL (PALM 3.9)
90	!
91	! 1003 2012-09-14 14:35:53Z raasch
92	! subdomains must have identical size (grid matching = "match" removed)
93	!
94	! 1001 2012-09-13 14:08:46Z raasch
95	! all actions concerning upstream-spline-method removed
96	!
97	! 978 2012-08-09 08:28:32Z fricke
98	! dirichlet/neumann and neumann/dirichlet added
99	! nxlu and nysv are also calculated for inflow boundary
100	!
101	! 809 2012-01-30 13:32:58Z maronga
102	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
103	!
104	! 807 2012-01-25 11:53:51Z maronga
105	! New cpp directive "__check" implemented which is used by check_namelist_files
106	!
107	! Revision 1.1 1997/07/24 11:15:09 raasch
108	! Initial revision
109	!
110	!
111	! Description:
112	! ------------
113	! Determination of the virtual processor topology (if not prescribed by the
114	! user)and computation of the grid point number and array bounds of the local
115	! domains.
116	!------------------------------------------------------------------------------!
117
118	USE control_parameters, &
119	ONLY: bc_lr, bc_ns, coupling_mode, coupling_mode_remote, &
120	coupling_topology, dt_dosp, gathered_size, grid_level, &
121	grid_level_count, host, inflow_l, inflow_n, inflow_r, inflow_s, &
122	io_blocks, io_group, maximum_grid_level, &
123	maximum_parallel_io_streams, message_string, &
124	mg_switch_to_pe0_level, momentum_advec, neutral, psolver, &
125	outflow_l, outflow_n, outflow_r, outflow_s, recycling_width, &
126	scalar_advec, subdomain_size
127
128	USE grid_variables, &
129	ONLY: dx
130
131	USE indices, &
132	ONLY: mg_loc_ind, nbgp, nnx, nny, nnz, nx, nx_a, nx_o, nxl, nxl_mg, &
133	nxlu, nxr, nxr_mg, ny, ny_a, ny_o, nyn, nyn_mg, nys, nys_mg, &
134	nysv, nz, nzb, nzt, nzt_mg, wall_flags_1, wall_flags_2, &
135	wall_flags_3, wall_flags_4, wall_flags_5, wall_flags_6, &
136	wall_flags_7, wall_flags_8, wall_flags_9, wall_flags_10
137
138	USE kinds
139
140	USE pegrid
141
142	USE transpose_indices, &
143	ONLY: nxl_y, nxl_yd, nxl_z, nxr_y, nxr_yd, nxr_z, nyn_x, nyn_z, nys_x,&
144	nys_z, nzb_x, nzb_y, nzb_yd, nzt_x, nzt_yd, nzt_y
145
146	IMPLICIT NONE
147
148	INTEGER(iwp) :: i !:
149	INTEGER(iwp) :: id_inflow_l !:
150	INTEGER(iwp) :: id_recycling_l !:
151	INTEGER(iwp) :: ind(5) !:
152	INTEGER(iwp) :: j !:
153	INTEGER(iwp) :: k !:
154	INTEGER(iwp) :: maximum_grid_level_l !:
155	INTEGER(iwp) :: mg_levels_x !:
156	INTEGER(iwp) :: mg_levels_y !:
157	INTEGER(iwp) :: mg_levels_z !:
158	INTEGER(iwp) :: mg_switch_to_pe0_level_l !:
159	INTEGER(iwp) :: nnx_y !:
160	INTEGER(iwp) :: nnx_z !:
161	INTEGER(iwp) :: nny_x !:
162	INTEGER(iwp) :: nny_z !:
163	INTEGER(iwp) :: nnz_x !:
164	INTEGER(iwp) :: nnz_y !:
165	INTEGER(iwp) :: numproc_sqr !:
166	INTEGER(iwp) :: nxl_l !:
167	INTEGER(iwp) :: nxr_l !:
168	INTEGER(iwp) :: nyn_l !:
169	INTEGER(iwp) :: nys_l !:
170	INTEGER(iwp) :: nzb_l !:
171	INTEGER(iwp) :: nzt_l !:
172	INTEGER(iwp) :: omp_get_num_threads !:
173
174	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: ind_all !:
175	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxlf !:
176	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxrf !:
177	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nynf !:
178	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nysf !:
179
180	INTEGER(iwp), DIMENSION(2) :: pdims_remote !:
181
182	#if defined( __mpi2 )
183	LOGICAL :: found !:
184	#endif
185
186	!
187	!-- Get the number of OpenMP threads
188	!$OMP PARALLEL
189	#if defined( __intel_openmp_bug )
190	threads_per_task = omp_get_num_threads()
191	#else
192	!$ threads_per_task = omp_get_num_threads()
193	#endif
194	!$OMP END PARALLEL
195
196
197	#if defined( __parallel )
198
199	CALL location_message( 'creating virtual PE grids + MPI derived data types', &
200	.FALSE. )
201	!
202	!-- Determine the processor topology or check it, if prescribed by the user
203	IF ( npex == -1 .AND. npey == -1 ) THEN
204
205	!
206	!-- Automatic determination of the topology
207	numproc_sqr = SQRT( REAL( numprocs, KIND=wp ) )
208	pdims(1) = MAX( numproc_sqr , 1 )
209	DO WHILE ( MOD( numprocs , pdims(1) ) /= 0 )
210	pdims(1) = pdims(1) - 1
211	ENDDO
212	pdims(2) = numprocs / pdims(1)
213
214	ELSEIF ( npex /= -1 .AND. npey /= -1 ) THEN
215
216	!
217	!-- Prescribed by user. Number of processors on the prescribed topology
218	!-- must be equal to the number of PEs available to the job
219	IF ( ( npex * npey ) /= numprocs ) THEN
220	WRITE( message_string, * ) 'number of PEs of the prescribed ', &
221	'topology (', npex*npey,') does not match & the number of ', &
222	'PEs available to the job (', numprocs, ')'
223	CALL message( 'init_pegrid', 'PA0221', 1, 2, 0, 6, 0 )
224	ENDIF
225	pdims(1) = npex
226	pdims(2) = npey
227
228	ELSE
229	!
230	!-- If the processor topology is prescribed by the user, the number of
231	!-- PEs must be given in both directions
232	message_string = 'if the processor topology is prescribed by the, ' // &
233	' user& both values of "npex" and "npey" must be given ' // &
234	'in the &NAMELIST-parameter file'
235	CALL message( 'init_pegrid', 'PA0222', 1, 2, 0, 6, 0 )
236
237	ENDIF
238
239	!
240	!-- For communication speedup, set barriers in front of collective
241	!-- communications by default on SGI-type systems
242	IF ( host(3:5) == 'sgi' ) collective_wait = .TRUE.
243
244	!
245	!-- If necessary, set horizontal boundary conditions to non-cyclic
246	IF ( bc_lr /= 'cyclic' ) cyclic(1) = .FALSE.
247	IF ( bc_ns /= 'cyclic' ) cyclic(2) = .FALSE.
248
249
250	#if ! defined( __check)
251	!
252	!-- Create the virtual processor grid
253	CALL MPI_CART_CREATE( comm_palm, ndim, pdims, cyclic, reorder, &
254	comm2d, ierr )
255	CALL MPI_COMM_RANK( comm2d, myid, ierr )
256	WRITE (myid_char,'(''_'',I6.6)') myid
257
258	CALL MPI_CART_COORDS( comm2d, myid, ndim, pcoord, ierr )
259	CALL MPI_CART_SHIFT( comm2d, 0, 1, pleft, pright, ierr )
260	CALL MPI_CART_SHIFT( comm2d, 1, 1, psouth, pnorth, ierr )
261
262	!
263	!-- Determine sub-topologies for transpositions
264	!-- Transposition from z to x:
265	remain_dims(1) = .TRUE.
266	remain_dims(2) = .FALSE.
267	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dx, ierr )
268	CALL MPI_COMM_RANK( comm1dx, myidx, ierr )
269	!
270	!-- Transposition from x to y
271	remain_dims(1) = .FALSE.
272	remain_dims(2) = .TRUE.
273	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dy, ierr )
274	CALL MPI_COMM_RANK( comm1dy, myidy, ierr )
275
276	#endif
277
278	!
279	!-- Calculate array bounds along x-direction for every PE.
280	ALLOCATE( nxlf(0:pdims(1)-1), nxrf(0:pdims(1)-1), nynf(0:pdims(2)-1), &
281	nysf(0:pdims(2)-1) )
282
283	IF ( MOD( nx+1 , pdims(1) ) /= 0 ) THEN
284	WRITE( message_string, * ) 'x-direction: gridpoint number (',nx+1,') ',&
285	'is not an& integral divisor of the number ', &
286	'processors (', pdims(1),')'
287	CALL message( 'init_pegrid', 'PA0225', 1, 2, 0, 6, 0 )
288	ELSE
289	nnx = ( nx + 1 ) / pdims(1)
290	IF ( nnx*pdims(1) - ( nx + 1) > nnx ) THEN
291	WRITE( message_string, * ) 'x-direction: nx does not match the', &
292	'requirements given by the number of PEs &used', &
293	'& please use nx = ', nx - ( pdims(1) - ( nnx*pdims(1) &
294	- ( nx + 1 ) ) ), ' instead of nx =', nx
295	CALL message( 'init_pegrid', 'PA0226', 1, 2, 0, 6, 0 )
296	ENDIF
297	ENDIF
298
299	!
300	!-- Left and right array bounds, number of gridpoints
301	DO i = 0, pdims(1)-1
302	nxlf(i) = i * nnx
303	nxrf(i) = ( i + 1 ) * nnx - 1
304	ENDDO
305
306	!
307	!-- Calculate array bounds in y-direction for every PE.
308	IF ( MOD( ny+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 = ( ny + 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	ENDDO
330
331	!
332	!-- Local array bounds of the respective PEs
333	nxl = nxlf(pcoord(1))
334	nxr = nxrf(pcoord(1))
335	nys = nysf(pcoord(2))
336	nyn = nynf(pcoord(2))
337	nzb = 0
338	nzt = nz
339	nnz = nz
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	nys_x = nys
359	nyn_x = nyn
360	nny_x = nny
361	nnz_x = nz / pdims(1)
362	nzb_x = 1 + myidx * nnz_x
363	nzt_x = ( myidx + 1 ) * nnz_x
364	sendrecvcount_zx = nnx * nny * nnz_x
365
366	IF ( pdims(2) /= 1 ) THEN
367	IF ( MOD( nz , pdims(1) ) /= 0 ) THEN
368	WRITE( message_string, * ) 'transposition z --> x:', &
369	'&nz=',nz,' is not an integral divisior of pdims(1)=', &
370	pdims(1)
371	CALL message( 'init_pegrid', 'PA0230', 1, 2, 0, 6, 0 )
372	ENDIF
373	ENDIF
374
375	!
376	!-- 2. transposition x --> y
377	nnz_y = nnz_x
378	nzb_y = nzb_x
379	nzt_y = nzt_x
380	IF ( MOD( nx+1 , pdims(2) ) /= 0 ) THEN
381	WRITE( message_string, * ) 'transposition x --> y:', &
382	'&nx+1=',nx+1,' is not an integral divisor of ',&
383	'pdims(2)=',pdims(2)
384	CALL message( 'init_pegrid', 'PA0231', 1, 2, 0, 6, 0 )
385	ENDIF
386	nnx_y = (nx+1) / pdims(2)
387	nxl_y = myidy * nnx_y
388	nxr_y = ( myidy + 1 ) * nnx_y - 1
389	sendrecvcount_xy = nnx_y * nny_x * nnz_y
390
391	!
392	!-- 3. transposition y --> z (ELSE: x --> y in case of 1D-decomposition
393	!-- along x)
394	nnx_z = nnx_y
395	nxl_z = nxl_y
396	nxr_z = nxr_y
397	nny_z = (ny+1) / pdims(1)
398	nys_z = myidx * nny_z
399	nyn_z = ( myidx + 1 ) * nny_z - 1
400	sendrecvcount_yz = nnx_y * nny_z * nnz_y
401
402	IF ( pdims(2) /= 1 ) THEN
403	!
404	!-- y --> z
405	!-- This transposition is not neccessary in case of a 1d-decomposition
406	!-- along x, except that the uptream-spline method is switched on
407	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
408	WRITE( message_string, * ) 'transposition y --> z:', &
409	'& ny+1=',ny+1,' is not an integral divisor of ',&
410	'pdims(1)=',pdims(1)
411	CALL message( 'init_pegrid', 'PA0232', 1, 2, 0, 6, 0 )
412	ENDIF
413
414	ELSE
415	!
416	!-- x --> y. This condition must be fulfilled for a 1D-decomposition along x
417	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
418	WRITE( message_string, * ) 'transposition x --> y:', &
419	'& ny+1=',ny+1,' is not an integral divisor of ',&
420	'pdims(1)=',pdims(1)
421	CALL message( 'init_pegrid', 'PA0233', 1, 2, 0, 6, 0 )
422	ENDIF
423
424	ENDIF
425
426	!
427	!-- Indices for direct transpositions z --> y (used for calculating spectra)
428	IF ( dt_dosp /= 9999999.9_wp ) THEN
429	IF ( MOD( nz, pdims(2) ) /= 0 ) THEN
430	WRITE( message_string, * ) 'direct transposition z --> y (needed ', &
431	'for spectra):& nz=',nz,' is not an integral divisor of ',&
432	'pdims(2)=',pdims(2)
433	CALL message( 'init_pegrid', 'PA0234', 1, 2, 0, 6, 0 )
434	ELSE
435	nxl_yd = nxl
436	nxr_yd = nxr
437	nzb_yd = 1 + myidy * ( nz / pdims(2) )
438	nzt_yd = ( myidy + 1 ) * ( nz / pdims(2) )
439	sendrecvcount_zyd = nnx * nny * ( nz / pdims(2) )
440	ENDIF
441	ENDIF
442
443	!
444	!-- Indices for direct transpositions y --> x (they are only possible in case
445	!-- of a 1d-decomposition along x)
446	IF ( pdims(2) == 1 ) THEN
447	nny_x = nny / pdims(1)
448	nys_x = myid * nny_x
449	nyn_x = ( myid + 1 ) * nny_x - 1
450	nzb_x = 1
451	nzt_x = nz
452	sendrecvcount_xy = nnx * nny_x * nz
453	ENDIF
454
455	!
456	!-- Indices for direct transpositions x --> y (they are only possible in case
457	!-- of a 1d-decomposition along y)
458	IF ( pdims(1) == 1 ) THEN
459	nnx_y = nnx / pdims(2)
460	nxl_y = myid * nnx_y
461	nxr_y = ( myid + 1 ) * nnx_y - 1
462	nzb_y = 1
463	nzt_y = nz
464	sendrecvcount_xy = nnx_y * nny * nz
465	ENDIF
466
467	!
468	!-- Arrays for storing the array bounds are needed any more
469	DEALLOCATE( nxlf , nxrf , nynf , nysf )
470
471
472	#if ! defined( __check)
473	!
474	!-- Collect index bounds from other PEs (to be written to restart file later)
475	ALLOCATE( hor_index_bounds(4,0:numprocs-1) )
476
477	IF ( myid == 0 ) THEN
478
479	hor_index_bounds(1,0) = nxl
480	hor_index_bounds(2,0) = nxr
481	hor_index_bounds(3,0) = nys
482	hor_index_bounds(4,0) = nyn
483
484	!
485	!-- Receive data from all other PEs
486	DO i = 1, numprocs-1
487	CALL MPI_RECV( ibuf, 4, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
488	ierr )
489	hor_index_bounds(:,i) = ibuf(1:4)
490	ENDDO
491
492	ELSE
493	!
494	!-- Send index bounds to PE0
495	ibuf(1) = nxl
496	ibuf(2) = nxr
497	ibuf(3) = nys
498	ibuf(4) = nyn
499	CALL MPI_SEND( ibuf, 4, MPI_INTEGER, 0, myid, comm2d, ierr )
500
501	ENDIF
502
503	#endif
504
505	#if defined( __print )
506	!
507	!-- Control output
508	IF ( myid == 0 ) THEN
509	PRINT, ' processor topology *'
510	PRINT*, ' '
511	PRINT*, 'myid pcoord left right south north idx idy nxl: nxr',&
512	&' nys: nyn'
513	PRINT*, '------------------------------------------------------------',&
514	&'-----------'
515	WRITE (*,1000) 0, pcoord(1), pcoord(2), pleft, pright, psouth, pnorth, &
516	myidx, myidy, nxl, nxr, nys, nyn
517	1000 FORMAT (I4,2X,'(',I3,',',I3,')',3X,I4,2X,I4,3X,I4,2X,I4,2X,I3,1X,I3, &
518	2(2X,I4,':',I4))
519
520	!
521	!-- Receive data from the other PEs
522	DO i = 1,numprocs-1
523	CALL MPI_RECV( ibuf, 12, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
524	ierr )
525	WRITE (*,1000) i, ( ibuf(j) , j = 1,12 )
526	ENDDO
527	ELSE
528
529	!
530	!-- Send data to PE0
531	ibuf(1) = pcoord(1); ibuf(2) = pcoord(2); ibuf(3) = pleft
532	ibuf(4) = pright; ibuf(5) = psouth; ibuf(6) = pnorth; ibuf(7) = myidx
533	ibuf(8) = myidy; ibuf(9) = nxl; ibuf(10) = nxr; ibuf(11) = nys
534	ibuf(12) = nyn
535	CALL MPI_SEND( ibuf, 12, MPI_INTEGER, 0, myid, comm2d, ierr )
536	ENDIF
537	#endif
538
539	#if defined( __parallel ) && ! defined( __check)
540	#if defined( __mpi2 )
541	!
542	!-- In case of coupled runs, get the port name on PE0 of the atmosphere model
543	!-- and pass it to PE0 of the ocean model
544	IF ( myid == 0 ) THEN
545
546	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
547
548	CALL MPI_OPEN_PORT( MPI_INFO_NULL, port_name, ierr )
549
550	CALL MPI_PUBLISH_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, &
551	ierr )
552
553	!
554	!-- Write a flag file for the ocean model and the other atmosphere
555	!-- processes.
556	!-- There seems to be a bug in MPICH2 which causes hanging processes
557	!-- in case that execution of LOOKUP_NAME is continued too early
558	!-- (i.e. before the port has been created)
559	OPEN( 90, FILE='COUPLING_PORT_OPENED', FORM='FORMATTED' )
560	WRITE ( 90, '(''TRUE'')' )
561	CLOSE ( 90 )
562
563	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
564
565	!
566	!-- Continue only if the atmosphere model has created the port.
567	!-- There seems to be a bug in MPICH2 which causes hanging processes
568	!-- in case that execution of LOOKUP_NAME is continued too early
569	!-- (i.e. before the port has been created)
570	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
571	DO WHILE ( .NOT. found )
572	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
573	ENDDO
574
575	CALL MPI_LOOKUP_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, ierr )
576
577	ENDIF
578
579	ENDIF
580
581	!
582	!-- In case of coupled runs, establish the connection between the atmosphere
583	!-- and the ocean model and define the intercommunicator (comm_inter)
584	CALL MPI_BARRIER( comm2d, ierr )
585	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
586
587	CALL MPI_COMM_ACCEPT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
588	comm_inter, ierr )
589	coupling_mode_remote = 'ocean_to_atmosphere'
590
591	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
592
593	CALL MPI_COMM_CONNECT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
594	comm_inter, ierr )
595	coupling_mode_remote = 'atmosphere_to_ocean'
596
597	ENDIF
598	#endif
599
600	!
601	!-- Determine the number of ghost point layers
602	IF ( ( scalar_advec == 'ws-scheme' .AND. .NOT. neutral ) .OR. &
603	scalar_advec == 'ws-scheme-mono' .OR. &
604	momentum_advec == 'ws-scheme' ) THEN
605	nbgp = 3
606	ELSE
607	nbgp = 1
608	ENDIF
609
610	!
611	!-- Create a new MPI derived datatype for the exchange of surface (xy) data,
612	!-- which is needed for coupled atmosphere-ocean runs.
613	!-- First, calculate number of grid points of an xy-plane.
614	ngp_xy = ( nxr - nxl + 1 + 2 * nbgp ) * ( nyn - nys + 1 + 2 * nbgp )
615	CALL MPI_TYPE_VECTOR( ngp_xy, 1, nzt-nzb+2, MPI_REAL, type_xy, ierr )
616	CALL MPI_TYPE_COMMIT( type_xy, ierr )
617
618	IF ( TRIM( coupling_mode ) /= 'uncoupled' ) THEN
619
620	!
621	!-- Pass the number of grid points of the atmosphere model to
622	!-- the ocean model and vice versa
623	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
624
625	nx_a = nx
626	ny_a = ny
627
628	IF ( myid == 0 ) THEN
629
630	CALL MPI_SEND( nx_a, 1, MPI_INTEGER, numprocs, 1, comm_inter, &
631	ierr )
632	CALL MPI_SEND( ny_a, 1, MPI_INTEGER, numprocs, 2, comm_inter, &
633	ierr )
634	CALL MPI_SEND( pdims, 2, MPI_INTEGER, numprocs, 3, comm_inter, &
635	ierr )
636	CALL MPI_RECV( nx_o, 1, MPI_INTEGER, numprocs, 4, comm_inter, &
637	status, ierr )
638	CALL MPI_RECV( ny_o, 1, MPI_INTEGER, numprocs, 5, comm_inter, &
639	status, ierr )
640	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, numprocs, 6, &
641	comm_inter, status, ierr )
642	ENDIF
643
644	CALL MPI_BCAST( nx_o, 1, MPI_INTEGER, 0, comm2d, ierr )
645	CALL MPI_BCAST( ny_o, 1, MPI_INTEGER, 0, comm2d, ierr )
646	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr )
647
648	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
649
650	nx_o = nx
651	ny_o = ny
652
653	IF ( myid == 0 ) THEN
654
655	CALL MPI_RECV( nx_a, 1, MPI_INTEGER, 0, 1, comm_inter, status, &
656	ierr )
657	CALL MPI_RECV( ny_a, 1, MPI_INTEGER, 0, 2, comm_inter, status, &
658	ierr )
659	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, 0, 3, comm_inter, &
660	status, ierr )
661	CALL MPI_SEND( nx_o, 1, MPI_INTEGER, 0, 4, comm_inter, ierr )
662	CALL MPI_SEND( ny_o, 1, MPI_INTEGER, 0, 5, comm_inter, ierr )
663	CALL MPI_SEND( pdims, 2, MPI_INTEGER, 0, 6, comm_inter, ierr )
664	ENDIF
665
666	CALL MPI_BCAST( nx_a, 1, MPI_INTEGER, 0, comm2d, ierr)
667	CALL MPI_BCAST( ny_a, 1, MPI_INTEGER, 0, comm2d, ierr)
668	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr)
669
670	ENDIF
671
672	ngp_a = ( nx_a+1 + 2 * nbgp ) * ( ny_a+1 + 2 * nbgp )
673	ngp_o = ( nx_o+1 + 2 * nbgp ) * ( ny_o+1 + 2 * nbgp )
674
675	!
676	!-- Determine if the horizontal grid and the number of PEs in ocean and
677	!-- atmosphere is same or not
678	IF ( nx_o == nx_a .AND. ny_o == ny_a .AND. &
679	pdims(1) == pdims_remote(1) .AND. pdims(2) == pdims_remote(2) ) &
680	THEN
681	coupling_topology = 0
682	ELSE
683	coupling_topology = 1
684	ENDIF
685
686	!
687	!-- Determine the target PEs for the exchange between ocean and
688	!-- atmosphere (comm2d)
689	IF ( coupling_topology == 0 ) THEN
690	!
691	!-- In case of identical topologies, every atmosphere PE has exactly one
692	!-- ocean PE counterpart and vice versa
693	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
694	target_id = myid + numprocs
695	ELSE
696	target_id = myid
697	ENDIF
698
699	ELSE
700	!
701	!-- In case of nonequivalent topology in ocean and atmosphere only for
702	!-- PE0 in ocean and PE0 in atmosphere a target_id is needed, since
703	!-- data echxchange between ocean and atmosphere will be done only
704	!-- between these PEs.
705	IF ( myid == 0 ) THEN
706
707	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
708	target_id = numprocs
709	ELSE
710	target_id = 0
711	ENDIF
712
713	ENDIF
714
715	ENDIF
716
717	ENDIF
718
719
720	#endif
721
722	#else
723
724	!
725	!-- Array bounds when running on a single PE (respectively a non-parallel
726	!-- machine)
727	nxl = 0
728	nxr = nx
729	nnx = nxr - nxl + 1
730	nys = 0
731	nyn = ny
732	nny = nyn - nys + 1
733	nzb = 0
734	nzt = nz
735	nnz = nz
736
737	ALLOCATE( hor_index_bounds(4,0:0) )
738	hor_index_bounds(1,0) = nxl
739	hor_index_bounds(2,0) = nxr
740	hor_index_bounds(3,0) = nys
741	hor_index_bounds(4,0) = nyn
742
743	!
744	!-- Array bounds for the pressure solver (in the parallel code, these bounds
745	!-- are the ones for the transposed arrays)
746	nys_x = nys
747	nyn_x = nyn
748	nzb_x = nzb + 1
749	nzt_x = nzt
750
751	nxl_y = nxl
752	nxr_y = nxr
753	nzb_y = nzb + 1
754	nzt_y = nzt
755
756	nxl_z = nxl
757	nxr_z = nxr
758	nys_z = nys
759	nyn_z = nyn
760
761	#endif
762
763	!
764	!-- Calculate number of grid levels necessary for the multigrid poisson solver
765	!-- as well as the gridpoint indices on each level
766	IF ( psolver(1:9) == 'multigrid' ) THEN
767
768	!
769	!-- First calculate number of possible grid levels for the subdomains
770	mg_levels_x = 1
771	mg_levels_y = 1
772	mg_levels_z = 1
773
774	i = nnx
775	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
776	i = i / 2
777	mg_levels_x = mg_levels_x + 1
778	ENDDO
779
780	j = nny
781	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
782	j = j / 2
783	mg_levels_y = mg_levels_y + 1
784	ENDDO
785
786	k = nz ! do not use nnz because it might be > nz due to transposition
787	! requirements
788	DO WHILE ( MOD( k, 2 ) == 0 .AND. k /= 2 )
789	k = k / 2
790	mg_levels_z = mg_levels_z + 1
791	ENDDO
792
793	maximum_grid_level = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
794
795	!
796	!-- Find out, if the total domain allows more levels. These additional
797	!-- levels are identically processed on all PEs.
798	IF ( numprocs > 1 .AND. mg_switch_to_pe0_level /= -1 ) THEN
799
800	IF ( mg_levels_z > MIN( mg_levels_x, mg_levels_y ) ) THEN
801
802	mg_switch_to_pe0_level_l = maximum_grid_level
803
804	mg_levels_x = 1
805	mg_levels_y = 1
806
807	i = nx+1
808	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
809	i = i / 2
810	mg_levels_x = mg_levels_x + 1
811	ENDDO
812
813	j = ny+1
814	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
815	j = j / 2
816	mg_levels_y = mg_levels_y + 1
817	ENDDO
818
819	maximum_grid_level_l = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
820
821	IF ( maximum_grid_level_l > mg_switch_to_pe0_level_l ) THEN
822	mg_switch_to_pe0_level_l = maximum_grid_level_l - &
823	mg_switch_to_pe0_level_l + 1
824	ELSE
825	mg_switch_to_pe0_level_l = 0
826	ENDIF
827
828	ELSE
829	mg_switch_to_pe0_level_l = 0
830	maximum_grid_level_l = maximum_grid_level
831
832	ENDIF
833
834	!
835	!-- Use switch level calculated above only if it is not pre-defined
836	!-- by user
837	IF ( mg_switch_to_pe0_level == 0 ) THEN
838	IF ( mg_switch_to_pe0_level_l /= 0 ) THEN
839	mg_switch_to_pe0_level = mg_switch_to_pe0_level_l
840	maximum_grid_level = maximum_grid_level_l
841	ENDIF
842
843	ELSE
844	!
845	!-- Check pre-defined value and reset to default, if neccessary
846	IF ( mg_switch_to_pe0_level < mg_switch_to_pe0_level_l .OR. &
847	mg_switch_to_pe0_level >= maximum_grid_level_l ) THEN
848	message_string = 'mg_switch_to_pe0_level ' // &
849	'out of range and reset to default (=0)'
850	CALL message( 'init_pegrid', 'PA0235', 0, 1, 0, 6, 0 )
851	mg_switch_to_pe0_level = 0
852	ELSE
853	!
854	!-- Use the largest number of possible levels anyway and recalculate
855	!-- the switch level to this largest number of possible values
856	maximum_grid_level = maximum_grid_level_l
857
858	ENDIF
859
860	ENDIF
861
862	ENDIF
863
864	ALLOCATE( grid_level_count(maximum_grid_level), &
865	nxl_mg(0:maximum_grid_level), nxr_mg(0:maximum_grid_level), &
866	nyn_mg(0:maximum_grid_level), nys_mg(0:maximum_grid_level), &
867	nzt_mg(0:maximum_grid_level) )
868
869	grid_level_count = 0
870	!
871	!-- Index zero required as dummy due to definition of arrays f2 and p2 in
872	!-- recursive subroutine next_mg_level
873	nxl_mg(0) = 0; nxr_mg(0) = 0; nyn_mg(0) = 0; nys_mg(0) = 0; nzt_mg(0) = 0
874
875	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzt_l = nzt
876
877	DO i = maximum_grid_level, 1 , -1
878
879	IF ( i == mg_switch_to_pe0_level ) THEN
880	#if defined( __parallel ) && ! defined( __check )
881	!
882	!-- Save the grid size of the subdomain at the switch level, because
883	!-- it is needed in poismg.
884	ind(1) = nxl_l; ind(2) = nxr_l
885	ind(3) = nys_l; ind(4) = nyn_l
886	ind(5) = nzt_l
887	ALLOCATE( ind_all(5*numprocs), mg_loc_ind(5,0:numprocs-1) )
888	CALL MPI_ALLGATHER( ind, 5, MPI_INTEGER, ind_all, 5, &
889	MPI_INTEGER, comm2d, ierr )
890	DO j = 0, numprocs-1
891	DO k = 1, 5
892	mg_loc_ind(k,j) = ind_all(k+j*5)
893	ENDDO
894	ENDDO
895	DEALLOCATE( ind_all )
896	!
897	!-- Calculate the grid size of the total domain
898	nxr_l = ( nxr_l-nxl_l+1 ) * pdims(1) - 1
899	nxl_l = 0
900	nyn_l = ( nyn_l-nys_l+1 ) * pdims(2) - 1
901	nys_l = 0
902	!
903	!-- The size of this gathered array must not be larger than the
904	!-- array tend, which is used in the multigrid scheme as a temporary
905	!-- array. Therefore the subdomain size of an PE is calculated and
906	!-- the size of the gathered grid. These values are used in
907	!-- routines pres and poismg
908	subdomain_size = ( nxr - nxl + 2 * nbgp + 1 ) * &
909	( nyn - nys + 2 * nbgp + 1 ) * ( nzt - nzb + 2 )
910	gathered_size = ( nxr_l - nxl_l + 3 ) * ( nyn_l - nys_l + 3 ) * &
911	( nzt_l - nzb + 2 )
912
913	#elif ! defined ( __parallel )
914	message_string = 'multigrid gather/scatter impossible ' // &
915	'in non parallel mode'
916	CALL message( 'init_pegrid', 'PA0237', 1, 2, 0, 6, 0 )
917	#endif
918	ENDIF
919
920	nxl_mg(i) = nxl_l
921	nxr_mg(i) = nxr_l
922	nys_mg(i) = nys_l
923	nyn_mg(i) = nyn_l
924	nzt_mg(i) = nzt_l
925
926	nxl_l = nxl_l / 2
927	nxr_l = nxr_l / 2
928	nys_l = nys_l / 2
929	nyn_l = nyn_l / 2
930	nzt_l = nzt_l / 2
931
932	ENDDO
933
934	!
935	!-- Temporary problem: Currently calculation of maxerror iin routine poismg crashes
936	!-- if grid data are collected on PE0 already on the finest grid level.
937	!-- To be solved later.
938	IF ( maximum_grid_level == mg_switch_to_pe0_level ) THEN
939	message_string = 'grid coarsening on subdomain level cannot be performed'
940	CALL message( 'poismg', 'PA0236', 1, 2, 0, 6, 0 )
941	ENDIF
942
943	ELSE
944
945	maximum_grid_level = 0
946
947	ENDIF
948
949	!
950	!-- Default level 0 tells exchange_horiz that all ghost planes have to be
951	!-- exchanged. grid_level is adjusted in poismg, where only one ghost plane
952	!-- is required.
953	grid_level = 0
954
955	#if defined( __parallel ) && ! defined ( __check )
956	!
957	!-- Gridpoint number for the exchange of ghost points (y-line for 2D-arrays)
958	ngp_y = nyn - nys + 1 + 2 * nbgp
959
960	!
961	!-- Define new MPI derived datatypes for the exchange of ghost points in
962	!-- x- and y-direction for 2D-arrays (line)
963	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_REAL, type_x, &
964	ierr )
965	CALL MPI_TYPE_COMMIT( type_x, ierr )
966	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_INTEGER, &
967	type_x_int, ierr )
968	CALL MPI_TYPE_COMMIT( type_x_int, ierr )
969
970	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_REAL, type_y, ierr )
971	CALL MPI_TYPE_COMMIT( type_y, ierr )
972	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_INTEGER, type_y_int, ierr )
973	CALL MPI_TYPE_COMMIT( type_y_int, ierr )
974
975
976	!
977	!-- Calculate gridpoint numbers for the exchange of ghost points along x
978	!-- (yz-plane for 3D-arrays) and define MPI derived data type(s) for the
979	!-- exchange of ghost points in y-direction (xz-plane).
980	!-- Do these calculations for the model grid and (if necessary) also
981	!-- for the coarser grid levels used in the multigrid method
982	ALLOCATE ( ngp_xz(0:maximum_grid_level), ngp_yz(0:maximum_grid_level), &
983	type_xz(0:maximum_grid_level), type_yz(0:maximum_grid_level) )
984
985	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzb_l = nzb; nzt_l = nzt
986
987	!
988	!-- Discern between the model grid, which needs nbgp ghost points and
989	!-- grid levels for the multigrid scheme. In the latter case only one
990	!-- ghost point is necessary.
991	!-- First definition of MPI-datatypes for exchange of ghost layers on normal
992	!-- grid. The following loop is needed for data exchange in poismg.f90.
993	!
994	!-- Determine number of grid points of yz-layer for exchange
995	ngp_yz(0) = (nzt - nzb + 2) * (nyn - nys + 1 + 2 * nbgp)
996
997	!
998	!-- Define an MPI-datatype for the exchange of left/right boundaries.
999	!-- Although data are contiguous in physical memory (which does not
1000	!-- necessarily require an MPI-derived datatype), the data exchange between
1001	!-- left and right PE's using the MPI-derived type is 10% faster than without.
1002	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2nbgp, nbgp(nzt-nzb+2), ngp_yz(0), &
1003	MPI_REAL, type_xz(0), ierr )
1004	CALL MPI_TYPE_COMMIT( type_xz(0), ierr )
1005
1006	CALL MPI_TYPE_VECTOR( nbgp, ngp_yz(0), ngp_yz(0), MPI_REAL, type_yz(0), &
1007	ierr )
1008	CALL MPI_TYPE_COMMIT( type_yz(0), ierr )
1009
1010	!
1011	!-- Definition of MPI-datatypes for multigrid method (coarser level grids)
1012	IF ( psolver(1:9) == 'multigrid' ) THEN
1013	!
1014	!-- Definition of MPI-datatyoe as above, but only 1 ghost level is used
1015	DO i = maximum_grid_level, 1 , -1
1016
1017	ngp_xz(i) = (nzt_l - nzb_l + 2) * (nxr_l - nxl_l + 3)
1018	ngp_yz(i) = (nzt_l - nzb_l + 2) * (nyn_l - nys_l + 3)
1019
1020	CALL MPI_TYPE_VECTOR( nxr_l-nxl_l+3, nzt_l-nzb_l+2, ngp_yz(i), &
1021	MPI_REAL, type_xz(i), ierr )
1022	CALL MPI_TYPE_COMMIT( type_xz(i), ierr )
1023
1024	CALL MPI_TYPE_VECTOR( 1, ngp_yz(i), ngp_yz(i), MPI_REAL, type_yz(i), &
1025	ierr )
1026	CALL MPI_TYPE_COMMIT( type_yz(i), ierr )
1027
1028	nxl_l = nxl_l / 2
1029	nxr_l = nxr_l / 2
1030	nys_l = nys_l / 2
1031	nyn_l = nyn_l / 2
1032	nzt_l = nzt_l / 2
1033
1034	ENDDO
1035
1036	ENDIF
1037	#endif
1038
1039	#if defined( __parallel ) && ! defined ( __check )
1040	!
1041	!-- Setting of flags for inflow/outflow conditions in case of non-cyclic
1042	!-- horizontal boundary conditions.
1043	IF ( pleft == MPI_PROC_NULL ) THEN
1044	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1045	inflow_l = .TRUE.
1046	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1047	outflow_l = .TRUE.
1048	ENDIF
1049	ENDIF
1050
1051	IF ( pright == MPI_PROC_NULL ) THEN
1052	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1053	outflow_r = .TRUE.
1054	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1055	inflow_r = .TRUE.
1056	ENDIF
1057	ENDIF
1058
1059	IF ( psouth == MPI_PROC_NULL ) THEN
1060	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1061	outflow_s = .TRUE.
1062	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1063	inflow_s = .TRUE.
1064	ENDIF
1065	ENDIF
1066
1067	IF ( pnorth == MPI_PROC_NULL ) THEN
1068	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1069	inflow_n = .TRUE.
1070	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1071	outflow_n = .TRUE.
1072	ENDIF
1073	ENDIF
1074
1075	!
1076	!-- Broadcast the id of the inflow PE
1077	IF ( inflow_l ) THEN
1078	id_inflow_l = myidx
1079	ELSE
1080	id_inflow_l = 0
1081	ENDIF
1082	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1083	CALL MPI_ALLREDUCE( id_inflow_l, id_inflow, 1, MPI_INTEGER, MPI_SUM, &
1084	comm1dx, ierr )
1085
1086	!
1087	!-- Broadcast the id of the recycling plane
1088	!-- WARNING: needs to be adjusted in case of inflows other than from left side!
1089	IF ( NINT( recycling_width / dx ) >= nxl .AND. &
1090	NINT( recycling_width / dx ) <= nxr ) THEN
1091	id_recycling_l = myidx
1092	ELSE
1093	id_recycling_l = 0
1094	ENDIF
1095	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1096	CALL MPI_ALLREDUCE( id_recycling_l, id_recycling, 1, MPI_INTEGER, MPI_SUM, &
1097	comm1dx, ierr )
1098
1099	CALL location_message( 'finished', .TRUE. )
1100
1101	#elif ! defined ( __parallel )
1102	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1103	inflow_l = .TRUE.
1104	outflow_r = .TRUE.
1105	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1106	outflow_l = .TRUE.
1107	inflow_r = .TRUE.
1108	ENDIF
1109
1110	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1111	inflow_n = .TRUE.
1112	outflow_s = .TRUE.
1113	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1114	outflow_n = .TRUE.
1115	inflow_s = .TRUE.
1116	ENDIF
1117	#endif
1118
1119	!
1120	!-- At the inflow or outflow, u or v, respectively, have to be calculated for
1121	!-- one more grid point.
1122	IF ( inflow_l .OR. outflow_l ) THEN
1123	nxlu = nxl + 1
1124	ELSE
1125	nxlu = nxl
1126	ENDIF
1127	IF ( inflow_s .OR. outflow_s ) THEN
1128	nysv = nys + 1
1129	ELSE
1130	nysv = nys
1131	ENDIF
1132
1133	!
1134	!-- Allocate wall flag arrays used in the multigrid solver
1135	IF ( psolver(1:9) == 'multigrid' ) THEN
1136
1137	DO i = maximum_grid_level, 1, -1
1138
1139	SELECT CASE ( i )
1140
1141	CASE ( 1 )
1142	ALLOCATE( wall_flags_1(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 ( 2 )
1147	ALLOCATE( wall_flags_2(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 ( 3 )
1152	ALLOCATE( wall_flags_3(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 ( 4 )
1157	ALLOCATE( wall_flags_4(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 ( 5 )
1162	ALLOCATE( wall_flags_5(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 ( 6 )
1167	ALLOCATE( wall_flags_6(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 ( 7 )
1172	ALLOCATE( wall_flags_7(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 ( 8 )
1177	ALLOCATE( wall_flags_8(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 ( 9 )
1182	ALLOCATE( wall_flags_9(nzb:nzt_mg(i)+1, &
1183	nys_mg(i)-1:nyn_mg(i)+1, &
1184	nxl_mg(i)-1:nxr_mg(i)+1) )
1185
1186	CASE ( 10 )
1187	ALLOCATE( wall_flags_10(nzb:nzt_mg(i)+1, &
1188	nys_mg(i)-1:nyn_mg(i)+1, &
1189	nxl_mg(i)-1:nxr_mg(i)+1) )
1190
1191	CASE DEFAULT
1192	message_string = 'more than 10 multigrid levels'
1193	CALL message( 'init_pegrid', 'PA0238', 1, 2, 0, 6, 0 )
1194
1195	END SELECT
1196
1197	ENDDO
1198
1199	ENDIF
1200
1201	!
1202	!-- Calculate the number of groups into which parallel I/O is split.
1203	!-- The default for files which are opened by all PEs (or where each
1204	!-- PE opens his own independent file) is, that all PEs are doing input/output
1205	!-- in parallel at the same time. This might cause performance or even more
1206	!-- severe problems depending on the configuration of the underlying file
1207	!-- system.
1208	!-- First, set the default:
1209	IF ( maximum_parallel_io_streams == -1 .OR. &
1210	maximum_parallel_io_streams > numprocs ) THEN
1211	maximum_parallel_io_streams = numprocs
1212	ENDIF
1213
1214	!
1215	!-- Now calculate the number of io_blocks and the io_group to which the
1216	!-- respective PE belongs. I/O of the groups is done in serial, but in parallel
1217	!-- for all PEs belonging to the same group. A preliminary setting with myid
1218	!-- based on MPI_COMM_WORLD has been done in parin.
1219	io_blocks = numprocs / maximum_parallel_io_streams
1220	io_group = MOD( myid+1, io_blocks )
1221
1222
1223	END SUBROUTINE init_pegrid

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