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source: palm/trunk/SOURCE/init_pegrid.f90 @ 1678

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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 1678 2015-10-02 13:28:30Z boeske $
27	!
28	! 1677 2015-10-02 13:25:23Z boeske
29	! New MPI-data types for exchange of 3D integer arrays.
30	!
31	! 1575 2015-03-27 09:56:27Z raasch
32	! adjustments for psolver-queries, calculation of ngp_xz added
33	!
34	! 1565 2015-03-09 20:59:31Z suehring
35	! Refine if-clause for setting nbgp.
36	!
37	! 1557 2015-03-05 16:43:04Z suehring
38	! Adjustment for monotonic limiter
39	!
40	! 1468 2014-09-24 14:06:57Z maronga
41	! Adapted for use on up to 6-digit processor cores
42	!
43	! 1435 2014-07-21 10:37:02Z keck
44	! bugfix: added missing parameter coupling_mode_remote to ONLY-attribute
45	!
46	! 1402 2014-05-09 14:25:13Z raasch
47	! location messages modified
48	!
49	! 1384 2014-05-02 14:31:06Z raasch
50	! location messages added
51	!
52	! 1353 2014-04-08 15:21:23Z heinze
53	! REAL constants provided with KIND-attribute
54	!
55	! 1322 2014-03-20 16:38:49Z raasch
56	! REAL functions provided with KIND-attribute
57	!
58	! 1320 2014-03-20 08:40:49Z raasch
59	! ONLY-attribute added to USE-statements,
60	! kind-parameters added to all INTEGER and REAL declaration statements,
61	! kinds are defined in new module kinds,
62	! revision history before 2012 removed,
63	! comment fields (!:) to be used for variable explanations added to
64	! all variable declaration statements
65	!
66	! 1304 2014-03-12 10:29:42Z raasch
67	! bugfix: single core MPI runs missed some settings of transpose indices
68	!
69	! 1212 2013-08-15 08:46:27Z raasch
70	! error message for poisfft_hybrid removed
71	!
72	! 1159 2013-05-21 11:58:22Z fricke
73	! dirichlet/neumann and neumann/dirichlet removed
74	!
75	! 1139 2013-04-18 07:25:03Z raasch
76	! bugfix for calculating the id of the PE carrying the recycling plane
77	!
78	! 1111 2013-03-08 23:54:10Z raasch
79	! initialization of poisfft moved to module poisfft
80	!
81	! 1092 2013-02-02 11:24:22Z raasch
82	! unused variables removed
83	!
84	! 1056 2012-11-16 15:28:04Z raasch
85	! Indices for arrays n.._mg start from zero due to definition of arrays f2 and
86	! p2 as automatic arrays in recursive subroutine next_mg_level
87	!
88	! 1041 2012-11-06 02:36:29Z raasch
89	! a 2d virtual processor topology is used by default for all machines
90	!
91	! 1036 2012-10-22 13:43:42Z raasch
92	! code put under GPL (PALM 3.9)
93	!
94	! 1003 2012-09-14 14:35:53Z raasch
95	! subdomains must have identical size (grid matching = "match" removed)
96	!
97	! 1001 2012-09-13 14:08:46Z raasch
98	! all actions concerning upstream-spline-method removed
99	!
100	! 978 2012-08-09 08:28:32Z fricke
101	! dirichlet/neumann and neumann/dirichlet added
102	! nxlu and nysv are also calculated for inflow boundary
103	!
104	! 809 2012-01-30 13:32:58Z maronga
105	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
106	!
107	! 807 2012-01-25 11:53:51Z maronga
108	! New cpp directive "__check" implemented which is used by check_namelist_files
109	!
110	! Revision 1.1 1997/07/24 11:15:09 raasch
111	! Initial revision
112	!
113	!
114	! Description:
115	! ------------
116	! Determination of the virtual processor topology (if not prescribed by the
117	! user)and computation of the grid point number and array bounds of the local
118	! domains.
119	!------------------------------------------------------------------------------!
120
121	USE control_parameters, &
122	ONLY: bc_lr, bc_ns, coupling_mode, coupling_mode_remote, &
123	coupling_topology, dt_dosp, gathered_size, grid_level, &
124	grid_level_count, host, inflow_l, inflow_n, inflow_r, inflow_s, &
125	io_blocks, io_group, maximum_grid_level, &
126	maximum_parallel_io_streams, message_string, &
127	mg_switch_to_pe0_level, momentum_advec, neutral, psolver, &
128	outflow_l, outflow_n, outflow_r, outflow_s, recycling_width, &
129	scalar_advec, subdomain_size
130
131	USE grid_variables, &
132	ONLY: dx
133
134	USE indices, &
135	ONLY: mg_loc_ind, nbgp, nnx, nny, nnz, nx, nx_a, nx_o, nxl, nxl_mg, &
136	nxlu, nxr, nxr_mg, ny, ny_a, ny_o, nyn, nyn_mg, nys, nys_mg, &
137	nysv, nz, nzb, nzt, nzt_mg, wall_flags_1, wall_flags_2, &
138	wall_flags_3, wall_flags_4, wall_flags_5, wall_flags_6, &
139	wall_flags_7, wall_flags_8, wall_flags_9, wall_flags_10
140
141	USE kinds
142
143	USE pegrid
144
145	USE transpose_indices, &
146	ONLY: nxl_y, nxl_yd, nxl_z, nxr_y, nxr_yd, nxr_z, nyn_x, nyn_z, nys_x,&
147	nys_z, nzb_x, nzb_y, nzb_yd, nzt_x, nzt_yd, nzt_y
148
149	IMPLICIT NONE
150
151	INTEGER(iwp) :: i !:
152	INTEGER(iwp) :: id_inflow_l !:
153	INTEGER(iwp) :: id_recycling_l !:
154	INTEGER(iwp) :: ind(5) !:
155	INTEGER(iwp) :: j !:
156	INTEGER(iwp) :: k !:
157	INTEGER(iwp) :: maximum_grid_level_l !:
158	INTEGER(iwp) :: mg_levels_x !:
159	INTEGER(iwp) :: mg_levels_y !:
160	INTEGER(iwp) :: mg_levels_z !:
161	INTEGER(iwp) :: mg_switch_to_pe0_level_l !:
162	INTEGER(iwp) :: nnx_y !:
163	INTEGER(iwp) :: nnx_z !:
164	INTEGER(iwp) :: nny_x !:
165	INTEGER(iwp) :: nny_z !:
166	INTEGER(iwp) :: nnz_x !:
167	INTEGER(iwp) :: nnz_y !:
168	INTEGER(iwp) :: numproc_sqr !:
169	INTEGER(iwp) :: nxl_l !:
170	INTEGER(iwp) :: nxr_l !:
171	INTEGER(iwp) :: nyn_l !:
172	INTEGER(iwp) :: nys_l !:
173	INTEGER(iwp) :: nzb_l !:
174	INTEGER(iwp) :: nzt_l !:
175	INTEGER(iwp) :: omp_get_num_threads !:
176
177	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: ind_all !:
178	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxlf !:
179	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxrf !:
180	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nynf !:
181	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nysf !:
182
183	INTEGER(iwp), DIMENSION(2) :: pdims_remote !:
184
185	#if defined( __mpi2 )
186	LOGICAL :: found !:
187	#endif
188
189	!
190	!-- Get the number of OpenMP threads
191	!$OMP PARALLEL
192	#if defined( __intel_openmp_bug )
193	threads_per_task = omp_get_num_threads()
194	#else
195	!$ threads_per_task = omp_get_num_threads()
196	#endif
197	!$OMP END PARALLEL
198
199
200	#if defined( __parallel )
201
202	CALL location_message( 'creating virtual PE grids + MPI derived data types', &
203	.FALSE. )
204	!
205	!-- Determine the processor topology or check it, if prescribed by the user
206	IF ( npex == -1 .AND. npey == -1 ) THEN
207
208	!
209	!-- Automatic determination of the topology
210	numproc_sqr = SQRT( REAL( numprocs, KIND=wp ) )
211	pdims(1) = MAX( numproc_sqr , 1 )
212	DO WHILE ( MOD( numprocs , pdims(1) ) /= 0 )
213	pdims(1) = pdims(1) - 1
214	ENDDO
215	pdims(2) = numprocs / pdims(1)
216
217	ELSEIF ( npex /= -1 .AND. npey /= -1 ) THEN
218
219	!
220	!-- Prescribed by user. Number of processors on the prescribed topology
221	!-- must be equal to the number of PEs available to the job
222	IF ( ( npex * npey ) /= numprocs ) THEN
223	WRITE( message_string, * ) 'number of PEs of the prescribed ', &
224	'topology (', npex*npey,') does not match & the number of ', &
225	'PEs available to the job (', numprocs, ')'
226	CALL message( 'init_pegrid', 'PA0221', 1, 2, 0, 6, 0 )
227	ENDIF
228	pdims(1) = npex
229	pdims(2) = npey
230
231	ELSE
232	!
233	!-- If the processor topology is prescribed by the user, the number of
234	!-- PEs must be given in both directions
235	message_string = 'if the processor topology is prescribed by the, ' // &
236	' user& both values of "npex" and "npey" must be given ' // &
237	'in the &NAMELIST-parameter file'
238	CALL message( 'init_pegrid', 'PA0222', 1, 2, 0, 6, 0 )
239
240	ENDIF
241
242	!
243	!-- For communication speedup, set barriers in front of collective
244	!-- communications by default on SGI-type systems
245	IF ( host(3:5) == 'sgi' ) collective_wait = .TRUE.
246
247	!
248	!-- If necessary, set horizontal boundary conditions to non-cyclic
249	IF ( bc_lr /= 'cyclic' ) cyclic(1) = .FALSE.
250	IF ( bc_ns /= 'cyclic' ) cyclic(2) = .FALSE.
251
252
253	#if ! defined( __check)
254	!
255	!-- Create the virtual processor grid
256	CALL MPI_CART_CREATE( comm_palm, ndim, pdims, cyclic, reorder, &
257	comm2d, ierr )
258	CALL MPI_COMM_RANK( comm2d, myid, ierr )
259	WRITE (myid_char,'(''_'',I6.6)') myid
260
261	CALL MPI_CART_COORDS( comm2d, myid, ndim, pcoord, ierr )
262	CALL MPI_CART_SHIFT( comm2d, 0, 1, pleft, pright, ierr )
263	CALL MPI_CART_SHIFT( comm2d, 1, 1, psouth, pnorth, ierr )
264
265	!
266	!-- Determine sub-topologies for transpositions
267	!-- Transposition from z to x:
268	remain_dims(1) = .TRUE.
269	remain_dims(2) = .FALSE.
270	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dx, ierr )
271	CALL MPI_COMM_RANK( comm1dx, myidx, ierr )
272	!
273	!-- Transposition from x to y
274	remain_dims(1) = .FALSE.
275	remain_dims(2) = .TRUE.
276	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dy, ierr )
277	CALL MPI_COMM_RANK( comm1dy, myidy, ierr )
278
279	#endif
280
281	!
282	!-- Calculate array bounds along x-direction for every PE.
283	ALLOCATE( nxlf(0:pdims(1)-1), nxrf(0:pdims(1)-1), nynf(0:pdims(2)-1), &
284	nysf(0:pdims(2)-1) )
285
286	IF ( MOD( nx+1 , pdims(1) ) /= 0 ) THEN
287	WRITE( message_string, * ) 'x-direction: gridpoint number (',nx+1,') ',&
288	'is not an& integral divisor of the number ', &
289	'processors (', pdims(1),')'
290	CALL message( 'init_pegrid', 'PA0225', 1, 2, 0, 6, 0 )
291	ELSE
292	nnx = ( nx + 1 ) / pdims(1)
293	IF ( nnx*pdims(1) - ( nx + 1) > nnx ) THEN
294	WRITE( message_string, * ) 'x-direction: nx does not match the', &
295	'requirements given by the number of PEs &used', &
296	'& please use nx = ', nx - ( pdims(1) - ( nnx*pdims(1) &
297	- ( nx + 1 ) ) ), ' instead of nx =', nx
298	CALL message( 'init_pegrid', 'PA0226', 1, 2, 0, 6, 0 )
299	ENDIF
300	ENDIF
301
302	!
303	!-- Left and right array bounds, number of gridpoints
304	DO i = 0, pdims(1)-1
305	nxlf(i) = i * nnx
306	nxrf(i) = ( i + 1 ) * nnx - 1
307	ENDDO
308
309	!
310	!-- Calculate array bounds in y-direction for every PE.
311	IF ( MOD( ny+1 , pdims(2) ) /= 0 ) THEN
312	WRITE( message_string, * ) 'y-direction: gridpoint number (',ny+1,') ', &
313	'is not an& integral divisor of the number of', &
314	'processors (', pdims(2),')'
315	CALL message( 'init_pegrid', 'PA0227', 1, 2, 0, 6, 0 )
316	ELSE
317	nny = ( ny + 1 ) / pdims(2)
318	IF ( nny*pdims(2) - ( ny + 1) > nny ) THEN
319	WRITE( message_string, * ) 'y-direction: ny does not match the', &
320	'requirements given by the number of PEs &used ', &
321	'& please use ny = ', ny - ( pdims(2) - ( nnx*pdims(2) &
322	- ( ny + 1 ) ) ), ' instead of ny =', ny
323	CALL message( 'init_pegrid', 'PA0228', 1, 2, 0, 6, 0 )
324	ENDIF
325	ENDIF
326
327	!
328	!-- South and north array bounds
329	DO j = 0, pdims(2)-1
330	nysf(j) = j * nny
331	nynf(j) = ( j + 1 ) * nny - 1
332	ENDDO
333
334	!
335	!-- Local array bounds of the respective PEs
336	nxl = nxlf(pcoord(1))
337	nxr = nxrf(pcoord(1))
338	nys = nysf(pcoord(2))
339	nyn = nynf(pcoord(2))
340	nzb = 0
341	nzt = nz
342	nnz = nz
343
344	!
345	!-- Set switches to define if the PE is situated at the border of the virtual
346	!-- processor grid
347	IF ( nxl == 0 ) left_border_pe = .TRUE.
348	IF ( nxr == nx ) right_border_pe = .TRUE.
349	IF ( nys == 0 ) south_border_pe = .TRUE.
350	IF ( nyn == ny ) north_border_pe = .TRUE.
351
352	!
353	!-- Calculate array bounds and gridpoint numbers for the transposed arrays
354	!-- (needed in the pressure solver)
355	!-- For the transposed arrays, cyclic boundaries as well as top and bottom
356	!-- boundaries are omitted, because they are obstructive to the transposition
357
358	!
359	!-- 1. transposition z --> x
360	!-- This transposition is not neccessary in case of a 1d-decomposition along x
361	nys_x = nys
362	nyn_x = nyn
363	nny_x = nny
364	nnz_x = nz / pdims(1)
365	nzb_x = 1 + myidx * nnz_x
366	nzt_x = ( myidx + 1 ) * nnz_x
367	sendrecvcount_zx = nnx * nny * nnz_x
368
369	IF ( pdims(2) /= 1 ) THEN
370	IF ( MOD( nz , pdims(1) ) /= 0 ) THEN
371	WRITE( message_string, * ) 'transposition z --> x:', &
372	'&nz=',nz,' is not an integral divisior of pdims(1)=', &
373	pdims(1)
374	CALL message( 'init_pegrid', 'PA0230', 1, 2, 0, 6, 0 )
375	ENDIF
376	ENDIF
377
378	!
379	!-- 2. transposition x --> y
380	nnz_y = nnz_x
381	nzb_y = nzb_x
382	nzt_y = nzt_x
383	IF ( MOD( nx+1 , pdims(2) ) /= 0 ) THEN
384	WRITE( message_string, * ) 'transposition x --> y:', &
385	'&nx+1=',nx+1,' is not an integral divisor of ',&
386	'pdims(2)=',pdims(2)
387	CALL message( 'init_pegrid', 'PA0231', 1, 2, 0, 6, 0 )
388	ENDIF
389	nnx_y = (nx+1) / pdims(2)
390	nxl_y = myidy * nnx_y
391	nxr_y = ( myidy + 1 ) * nnx_y - 1
392	sendrecvcount_xy = nnx_y * nny_x * nnz_y
393
394	!
395	!-- 3. transposition y --> z (ELSE: x --> y in case of 1D-decomposition
396	!-- along x)
397	nnx_z = nnx_y
398	nxl_z = nxl_y
399	nxr_z = nxr_y
400	nny_z = (ny+1) / pdims(1)
401	nys_z = myidx * nny_z
402	nyn_z = ( myidx + 1 ) * nny_z - 1
403	sendrecvcount_yz = nnx_y * nny_z * nnz_y
404
405	IF ( pdims(2) /= 1 ) THEN
406	!
407	!-- y --> z
408	!-- This transposition is not neccessary in case of a 1d-decomposition
409	!-- along x, except that the uptream-spline method is switched on
410	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
411	WRITE( message_string, * ) 'transposition y --> z:', &
412	'& ny+1=',ny+1,' is not an integral divisor of ',&
413	'pdims(1)=',pdims(1)
414	CALL message( 'init_pegrid', 'PA0232', 1, 2, 0, 6, 0 )
415	ENDIF
416
417	ELSE
418	!
419	!-- x --> y. This condition must be fulfilled for a 1D-decomposition along x
420	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
421	WRITE( message_string, * ) 'transposition x --> y:', &
422	'& ny+1=',ny+1,' is not an integral divisor of ',&
423	'pdims(1)=',pdims(1)
424	CALL message( 'init_pegrid', 'PA0233', 1, 2, 0, 6, 0 )
425	ENDIF
426
427	ENDIF
428
429	!
430	!-- Indices for direct transpositions z --> y (used for calculating spectra)
431	IF ( dt_dosp /= 9999999.9_wp ) THEN
432	IF ( MOD( nz, pdims(2) ) /= 0 ) THEN
433	WRITE( message_string, * ) 'direct transposition z --> y (needed ', &
434	'for spectra):& nz=',nz,' is not an integral divisor of ',&
435	'pdims(2)=',pdims(2)
436	CALL message( 'init_pegrid', 'PA0234', 1, 2, 0, 6, 0 )
437	ELSE
438	nxl_yd = nxl
439	nxr_yd = nxr
440	nzb_yd = 1 + myidy * ( nz / pdims(2) )
441	nzt_yd = ( myidy + 1 ) * ( nz / pdims(2) )
442	sendrecvcount_zyd = nnx * nny * ( nz / pdims(2) )
443	ENDIF
444	ENDIF
445
446	!
447	!-- Indices for direct transpositions y --> x (they are only possible in case
448	!-- of a 1d-decomposition along x)
449	IF ( pdims(2) == 1 ) THEN
450	nny_x = nny / pdims(1)
451	nys_x = myid * nny_x
452	nyn_x = ( myid + 1 ) * nny_x - 1
453	nzb_x = 1
454	nzt_x = nz
455	sendrecvcount_xy = nnx * nny_x * nz
456	ENDIF
457
458	!
459	!-- Indices for direct transpositions x --> y (they are only possible in case
460	!-- of a 1d-decomposition along y)
461	IF ( pdims(1) == 1 ) THEN
462	nnx_y = nnx / pdims(2)
463	nxl_y = myid * nnx_y
464	nxr_y = ( myid + 1 ) * nnx_y - 1
465	nzb_y = 1
466	nzt_y = nz
467	sendrecvcount_xy = nnx_y * nny * nz
468	ENDIF
469
470	!
471	!-- Arrays for storing the array bounds are needed any more
472	DEALLOCATE( nxlf , nxrf , nynf , nysf )
473
474
475	#if ! defined( __check)
476	!
477	!-- Collect index bounds from other PEs (to be written to restart file later)
478	ALLOCATE( hor_index_bounds(4,0:numprocs-1) )
479
480	IF ( myid == 0 ) THEN
481
482	hor_index_bounds(1,0) = nxl
483	hor_index_bounds(2,0) = nxr
484	hor_index_bounds(3,0) = nys
485	hor_index_bounds(4,0) = nyn
486
487	!
488	!-- Receive data from all other PEs
489	DO i = 1, numprocs-1
490	CALL MPI_RECV( ibuf, 4, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
491	ierr )
492	hor_index_bounds(:,i) = ibuf(1:4)
493	ENDDO
494
495	ELSE
496	!
497	!-- Send index bounds to PE0
498	ibuf(1) = nxl
499	ibuf(2) = nxr
500	ibuf(3) = nys
501	ibuf(4) = nyn
502	CALL MPI_SEND( ibuf, 4, MPI_INTEGER, 0, myid, comm2d, ierr )
503
504	ENDIF
505
506	#endif
507
508	#if defined( __print )
509	!
510	!-- Control output
511	IF ( myid == 0 ) THEN
512	PRINT, ' processor topology *'
513	PRINT*, ' '
514	PRINT*, 'myid pcoord left right south north idx idy nxl: nxr',&
515	&' nys: nyn'
516	PRINT*, '------------------------------------------------------------',&
517	&'-----------'
518	WRITE (*,1000) 0, pcoord(1), pcoord(2), pleft, pright, psouth, pnorth, &
519	myidx, myidy, nxl, nxr, nys, nyn
520	1000 FORMAT (I4,2X,'(',I3,',',I3,')',3X,I4,2X,I4,3X,I4,2X,I4,2X,I3,1X,I3, &
521	2(2X,I4,':',I4))
522
523	!
524	!-- Receive data from the other PEs
525	DO i = 1,numprocs-1
526	CALL MPI_RECV( ibuf, 12, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
527	ierr )
528	WRITE (*,1000) i, ( ibuf(j) , j = 1,12 )
529	ENDDO
530	ELSE
531
532	!
533	!-- Send data to PE0
534	ibuf(1) = pcoord(1); ibuf(2) = pcoord(2); ibuf(3) = pleft
535	ibuf(4) = pright; ibuf(5) = psouth; ibuf(6) = pnorth; ibuf(7) = myidx
536	ibuf(8) = myidy; ibuf(9) = nxl; ibuf(10) = nxr; ibuf(11) = nys
537	ibuf(12) = nyn
538	CALL MPI_SEND( ibuf, 12, MPI_INTEGER, 0, myid, comm2d, ierr )
539	ENDIF
540	#endif
541
542	#if defined( __parallel ) && ! defined( __check)
543	#if defined( __mpi2 )
544	!
545	!-- In case of coupled runs, get the port name on PE0 of the atmosphere model
546	!-- and pass it to PE0 of the ocean model
547	IF ( myid == 0 ) THEN
548
549	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
550
551	CALL MPI_OPEN_PORT( MPI_INFO_NULL, port_name, ierr )
552
553	CALL MPI_PUBLISH_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, &
554	ierr )
555
556	!
557	!-- Write a flag file for the ocean model and the other atmosphere
558	!-- processes.
559	!-- There seems to be a bug in MPICH2 which causes hanging processes
560	!-- in case that execution of LOOKUP_NAME is continued too early
561	!-- (i.e. before the port has been created)
562	OPEN( 90, FILE='COUPLING_PORT_OPENED', FORM='FORMATTED' )
563	WRITE ( 90, '(''TRUE'')' )
564	CLOSE ( 90 )
565
566	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
567
568	!
569	!-- Continue only if the atmosphere model has created the port.
570	!-- There seems to be a bug in MPICH2 which causes hanging processes
571	!-- in case that execution of LOOKUP_NAME is continued too early
572	!-- (i.e. before the port has been created)
573	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
574	DO WHILE ( .NOT. found )
575	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
576	ENDDO
577
578	CALL MPI_LOOKUP_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, ierr )
579
580	ENDIF
581
582	ENDIF
583
584	!
585	!-- In case of coupled runs, establish the connection between the atmosphere
586	!-- and the ocean model and define the intercommunicator (comm_inter)
587	CALL MPI_BARRIER( comm2d, ierr )
588	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
589
590	CALL MPI_COMM_ACCEPT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
591	comm_inter, ierr )
592	coupling_mode_remote = 'ocean_to_atmosphere'
593
594	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
595
596	CALL MPI_COMM_CONNECT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
597	comm_inter, ierr )
598	coupling_mode_remote = 'atmosphere_to_ocean'
599
600	ENDIF
601	#endif
602
603	!
604	!-- Determine the number of ghost point layers
605	IF ( ( scalar_advec == 'ws-scheme' .AND. .NOT. neutral ) .OR. &
606	scalar_advec == 'ws-scheme-mono' .OR. &
607	momentum_advec == 'ws-scheme' ) THEN
608	nbgp = 3
609	ELSE
610	nbgp = 1
611	ENDIF
612
613	!
614	!-- Create a new MPI derived datatype for the exchange of surface (xy) data,
615	!-- which is needed for coupled atmosphere-ocean runs.
616	!-- First, calculate number of grid points of an xy-plane.
617	ngp_xy = ( nxr - nxl + 1 + 2 * nbgp ) * ( nyn - nys + 1 + 2 * nbgp )
618	CALL MPI_TYPE_VECTOR( ngp_xy, 1, nzt-nzb+2, MPI_REAL, type_xy, ierr )
619	CALL MPI_TYPE_COMMIT( type_xy, ierr )
620
621	IF ( TRIM( coupling_mode ) /= 'uncoupled' ) THEN
622
623	!
624	!-- Pass the number of grid points of the atmosphere model to
625	!-- the ocean model and vice versa
626	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
627
628	nx_a = nx
629	ny_a = ny
630
631	IF ( myid == 0 ) THEN
632
633	CALL MPI_SEND( nx_a, 1, MPI_INTEGER, numprocs, 1, comm_inter, &
634	ierr )
635	CALL MPI_SEND( ny_a, 1, MPI_INTEGER, numprocs, 2, comm_inter, &
636	ierr )
637	CALL MPI_SEND( pdims, 2, MPI_INTEGER, numprocs, 3, comm_inter, &
638	ierr )
639	CALL MPI_RECV( nx_o, 1, MPI_INTEGER, numprocs, 4, comm_inter, &
640	status, ierr )
641	CALL MPI_RECV( ny_o, 1, MPI_INTEGER, numprocs, 5, comm_inter, &
642	status, ierr )
643	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, numprocs, 6, &
644	comm_inter, status, ierr )
645	ENDIF
646
647	CALL MPI_BCAST( nx_o, 1, MPI_INTEGER, 0, comm2d, ierr )
648	CALL MPI_BCAST( ny_o, 1, MPI_INTEGER, 0, comm2d, ierr )
649	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr )
650
651	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
652
653	nx_o = nx
654	ny_o = ny
655
656	IF ( myid == 0 ) THEN
657
658	CALL MPI_RECV( nx_a, 1, MPI_INTEGER, 0, 1, comm_inter, status, &
659	ierr )
660	CALL MPI_RECV( ny_a, 1, MPI_INTEGER, 0, 2, comm_inter, status, &
661	ierr )
662	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, 0, 3, comm_inter, &
663	status, ierr )
664	CALL MPI_SEND( nx_o, 1, MPI_INTEGER, 0, 4, comm_inter, ierr )
665	CALL MPI_SEND( ny_o, 1, MPI_INTEGER, 0, 5, comm_inter, ierr )
666	CALL MPI_SEND( pdims, 2, MPI_INTEGER, 0, 6, comm_inter, ierr )
667	ENDIF
668
669	CALL MPI_BCAST( nx_a, 1, MPI_INTEGER, 0, comm2d, ierr)
670	CALL MPI_BCAST( ny_a, 1, MPI_INTEGER, 0, comm2d, ierr)
671	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr)
672
673	ENDIF
674
675	ngp_a = ( nx_a+1 + 2 * nbgp ) * ( ny_a+1 + 2 * nbgp )
676	ngp_o = ( nx_o+1 + 2 * nbgp ) * ( ny_o+1 + 2 * nbgp )
677
678	!
679	!-- Determine if the horizontal grid and the number of PEs in ocean and
680	!-- atmosphere is same or not
681	IF ( nx_o == nx_a .AND. ny_o == ny_a .AND. &
682	pdims(1) == pdims_remote(1) .AND. pdims(2) == pdims_remote(2) ) &
683	THEN
684	coupling_topology = 0
685	ELSE
686	coupling_topology = 1
687	ENDIF
688
689	!
690	!-- Determine the target PEs for the exchange between ocean and
691	!-- atmosphere (comm2d)
692	IF ( coupling_topology == 0 ) THEN
693	!
694	!-- In case of identical topologies, every atmosphere PE has exactly one
695	!-- ocean PE counterpart and vice versa
696	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
697	target_id = myid + numprocs
698	ELSE
699	target_id = myid
700	ENDIF
701
702	ELSE
703	!
704	!-- In case of nonequivalent topology in ocean and atmosphere only for
705	!-- PE0 in ocean and PE0 in atmosphere a target_id is needed, since
706	!-- data echxchange between ocean and atmosphere will be done only
707	!-- between these PEs.
708	IF ( myid == 0 ) THEN
709
710	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
711	target_id = numprocs
712	ELSE
713	target_id = 0
714	ENDIF
715
716	ENDIF
717
718	ENDIF
719
720	ENDIF
721
722
723	#endif
724
725	#else
726
727	!
728	!-- Array bounds when running on a single PE (respectively a non-parallel
729	!-- machine)
730	nxl = 0
731	nxr = nx
732	nnx = nxr - nxl + 1
733	nys = 0
734	nyn = ny
735	nny = nyn - nys + 1
736	nzb = 0
737	nzt = nz
738	nnz = nz
739
740	ALLOCATE( hor_index_bounds(4,0:0) )
741	hor_index_bounds(1,0) = nxl
742	hor_index_bounds(2,0) = nxr
743	hor_index_bounds(3,0) = nys
744	hor_index_bounds(4,0) = nyn
745
746	!
747	!-- Array bounds for the pressure solver (in the parallel code, these bounds
748	!-- are the ones for the transposed arrays)
749	nys_x = nys
750	nyn_x = nyn
751	nzb_x = nzb + 1
752	nzt_x = nzt
753
754	nxl_y = nxl
755	nxr_y = nxr
756	nzb_y = nzb + 1
757	nzt_y = nzt
758
759	nxl_z = nxl
760	nxr_z = nxr
761	nys_z = nys
762	nyn_z = nyn
763
764	#endif
765
766	!
767	!-- Calculate number of grid levels necessary for the multigrid poisson solver
768	!-- as well as the gridpoint indices on each level
769	IF ( psolver(1:9) == 'multigrid' ) THEN
770
771	!
772	!-- First calculate number of possible grid levels for the subdomains
773	mg_levels_x = 1
774	mg_levels_y = 1
775	mg_levels_z = 1
776
777	i = nnx
778	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
779	i = i / 2
780	mg_levels_x = mg_levels_x + 1
781	ENDDO
782
783	j = nny
784	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
785	j = j / 2
786	mg_levels_y = mg_levels_y + 1
787	ENDDO
788
789	k = nz ! do not use nnz because it might be > nz due to transposition
790	! requirements
791	DO WHILE ( MOD( k, 2 ) == 0 .AND. k /= 2 )
792	k = k / 2
793	mg_levels_z = mg_levels_z + 1
794	ENDDO
795
796	maximum_grid_level = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
797
798	!
799	!-- Find out, if the total domain allows more levels. These additional
800	!-- levels are identically processed on all PEs.
801	IF ( numprocs > 1 .AND. mg_switch_to_pe0_level /= -1 ) THEN
802
803	IF ( mg_levels_z > MIN( mg_levels_x, mg_levels_y ) ) THEN
804
805	mg_switch_to_pe0_level_l = maximum_grid_level
806
807	mg_levels_x = 1
808	mg_levels_y = 1
809
810	i = nx+1
811	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
812	i = i / 2
813	mg_levels_x = mg_levels_x + 1
814	ENDDO
815
816	j = ny+1
817	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
818	j = j / 2
819	mg_levels_y = mg_levels_y + 1
820	ENDDO
821
822	maximum_grid_level_l = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
823
824	IF ( maximum_grid_level_l > mg_switch_to_pe0_level_l ) THEN
825	mg_switch_to_pe0_level_l = maximum_grid_level_l - &
826	mg_switch_to_pe0_level_l + 1
827	ELSE
828	mg_switch_to_pe0_level_l = 0
829	ENDIF
830
831	ELSE
832	mg_switch_to_pe0_level_l = 0
833	maximum_grid_level_l = maximum_grid_level
834
835	ENDIF
836
837	!
838	!-- Use switch level calculated above only if it is not pre-defined
839	!-- by user
840	IF ( mg_switch_to_pe0_level == 0 ) THEN
841	IF ( mg_switch_to_pe0_level_l /= 0 ) THEN
842	mg_switch_to_pe0_level = mg_switch_to_pe0_level_l
843	maximum_grid_level = maximum_grid_level_l
844	ENDIF
845
846	ELSE
847	!
848	!-- Check pre-defined value and reset to default, if neccessary
849	IF ( mg_switch_to_pe0_level < mg_switch_to_pe0_level_l .OR. &
850	mg_switch_to_pe0_level >= maximum_grid_level_l ) THEN
851	message_string = 'mg_switch_to_pe0_level ' // &
852	'out of range and reset to default (=0)'
853	CALL message( 'init_pegrid', 'PA0235', 0, 1, 0, 6, 0 )
854	mg_switch_to_pe0_level = 0
855	ELSE
856	!
857	!-- Use the largest number of possible levels anyway and recalculate
858	!-- the switch level to this largest number of possible values
859	maximum_grid_level = maximum_grid_level_l
860
861	ENDIF
862
863	ENDIF
864
865	ENDIF
866
867	ALLOCATE( grid_level_count(maximum_grid_level), &
868	nxl_mg(0:maximum_grid_level), nxr_mg(0:maximum_grid_level), &
869	nyn_mg(0:maximum_grid_level), nys_mg(0:maximum_grid_level), &
870	nzt_mg(0:maximum_grid_level) )
871
872	grid_level_count = 0
873	!
874	!-- Index zero required as dummy due to definition of arrays f2 and p2 in
875	!-- recursive subroutine next_mg_level
876	nxl_mg(0) = 0; nxr_mg(0) = 0; nyn_mg(0) = 0; nys_mg(0) = 0; nzt_mg(0) = 0
877
878	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzt_l = nzt
879
880	DO i = maximum_grid_level, 1 , -1
881
882	IF ( i == mg_switch_to_pe0_level ) THEN
883	#if defined( __parallel ) && ! defined( __check )
884	!
885	!-- Save the grid size of the subdomain at the switch level, because
886	!-- it is needed in poismg.
887	ind(1) = nxl_l; ind(2) = nxr_l
888	ind(3) = nys_l; ind(4) = nyn_l
889	ind(5) = nzt_l
890	ALLOCATE( ind_all(5*numprocs), mg_loc_ind(5,0:numprocs-1) )
891	CALL MPI_ALLGATHER( ind, 5, MPI_INTEGER, ind_all, 5, &
892	MPI_INTEGER, comm2d, ierr )
893	DO j = 0, numprocs-1
894	DO k = 1, 5
895	mg_loc_ind(k,j) = ind_all(k+j*5)
896	ENDDO
897	ENDDO
898	DEALLOCATE( ind_all )
899	!
900	!-- Calculate the grid size of the total domain
901	nxr_l = ( nxr_l-nxl_l+1 ) * pdims(1) - 1
902	nxl_l = 0
903	nyn_l = ( nyn_l-nys_l+1 ) * pdims(2) - 1
904	nys_l = 0
905	!
906	!-- The size of this gathered array must not be larger than the
907	!-- array tend, which is used in the multigrid scheme as a temporary
908	!-- array. Therefore the subdomain size of an PE is calculated and
909	!-- the size of the gathered grid. These values are used in
910	!-- routines pres and poismg
911	subdomain_size = ( nxr - nxl + 2 * nbgp + 1 ) * &
912	( nyn - nys + 2 * nbgp + 1 ) * ( nzt - nzb + 2 )
913	gathered_size = ( nxr_l - nxl_l + 3 ) * ( nyn_l - nys_l + 3 ) * &
914	( nzt_l - nzb + 2 )
915
916	#elif ! defined ( __parallel )
917	message_string = 'multigrid gather/scatter impossible ' // &
918	'in non parallel mode'
919	CALL message( 'init_pegrid', 'PA0237', 1, 2, 0, 6, 0 )
920	#endif
921	ENDIF
922
923	nxl_mg(i) = nxl_l
924	nxr_mg(i) = nxr_l
925	nys_mg(i) = nys_l
926	nyn_mg(i) = nyn_l
927	nzt_mg(i) = nzt_l
928
929	nxl_l = nxl_l / 2
930	nxr_l = nxr_l / 2
931	nys_l = nys_l / 2
932	nyn_l = nyn_l / 2
933	nzt_l = nzt_l / 2
934
935	ENDDO
936
937	!
938	!-- Temporary problem: Currently calculation of maxerror iin routine poismg crashes
939	!-- if grid data are collected on PE0 already on the finest grid level.
940	!-- To be solved later.
941	IF ( maximum_grid_level == mg_switch_to_pe0_level ) THEN
942	message_string = 'grid coarsening on subdomain level cannot be performed'
943	CALL message( 'poismg', 'PA0236', 1, 2, 0, 6, 0 )
944	ENDIF
945
946	ELSE
947
948	maximum_grid_level = 0
949
950	ENDIF
951
952	!
953	!-- Default level 0 tells exchange_horiz that all ghost planes have to be
954	!-- exchanged. grid_level is adjusted in poismg, where only one ghost plane
955	!-- is required.
956	grid_level = 0
957
958	#if defined( __parallel ) && ! defined ( __check )
959	!
960	!-- Gridpoint number for the exchange of ghost points (y-line for 2D-arrays)
961	ngp_y = nyn - nys + 1 + 2 * nbgp
962
963	!
964	!-- Define new MPI derived datatypes for the exchange of ghost points in
965	!-- x- and y-direction for 2D-arrays (line)
966	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_REAL, type_x, &
967	ierr )
968	CALL MPI_TYPE_COMMIT( type_x, ierr )
969	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_INTEGER, &
970	type_x_int, ierr )
971	CALL MPI_TYPE_COMMIT( type_x_int, ierr )
972
973	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_REAL, type_y, ierr )
974	CALL MPI_TYPE_COMMIT( type_y, ierr )
975	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_INTEGER, type_y_int, ierr )
976	CALL MPI_TYPE_COMMIT( type_y_int, ierr )
977
978
979	!
980	!-- Calculate gridpoint numbers for the exchange of ghost points along x
981	!-- (yz-plane for 3D-arrays) and define MPI derived data type(s) for the
982	!-- exchange of ghost points in y-direction (xz-plane).
983	!-- Do these calculations for the model grid and (if necessary) also
984	!-- for the coarser grid levels used in the multigrid method
985	ALLOCATE ( ngp_xz(0:maximum_grid_level), ngp_yz(0:maximum_grid_level), &
986	type_xz(0:maximum_grid_level), type_yz(0:maximum_grid_level) )
987
988	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzb_l = nzb; nzt_l = nzt
989
990	!
991	!-- Discern between the model grid, which needs nbgp ghost points and
992	!-- grid levels for the multigrid scheme. In the latter case only one
993	!-- ghost point is necessary.
994	!-- First definition of MPI-datatypes for exchange of ghost layers on normal
995	!-- grid. The following loop is needed for data exchange in poismg.f90.
996	!
997	!-- Determine number of grid points of yz-layer for exchange
998	ngp_yz(0) = (nzt - nzb + 2) * (nyn - nys + 1 + 2 * nbgp)
999
1000	!
1001	!-- Define an MPI-datatype for the exchange of left/right boundaries.
1002	!-- Although data are contiguous in physical memory (which does not
1003	!-- necessarily require an MPI-derived datatype), the data exchange between
1004	!-- left and right PE's using the MPI-derived type is 10% faster than without.
1005	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2nbgp, nbgp(nzt-nzb+2), ngp_yz(0), &
1006	MPI_REAL, type_xz(0), ierr )
1007	CALL MPI_TYPE_COMMIT( type_xz(0), ierr )
1008
1009	CALL MPI_TYPE_VECTOR( nbgp, ngp_yz(0), ngp_yz(0), MPI_REAL, type_yz(0), &
1010	ierr )
1011	CALL MPI_TYPE_COMMIT( type_yz(0), ierr )
1012
1013	!
1014	!-- Definition of MPI-datatypes for multigrid method (coarser level grids)
1015	IF ( psolver(1:9) == 'multigrid' ) THEN
1016	!
1017	!-- Definition of MPI-datatyoe as above, but only 1 ghost level is used
1018	DO i = maximum_grid_level, 1 , -1
1019
1020	ngp_xz(i) = (nzt_l - nzb_l + 2) * (nxr_l - nxl_l + 3)
1021	ngp_yz(i) = (nzt_l - nzb_l + 2) * (nyn_l - nys_l + 3)
1022
1023	CALL MPI_TYPE_VECTOR( nxr_l-nxl_l+3, nzt_l-nzb_l+2, ngp_yz(i), &
1024	MPI_REAL, type_xz(i), ierr )
1025	CALL MPI_TYPE_COMMIT( type_xz(i), ierr )
1026
1027	CALL MPI_TYPE_VECTOR( 1, ngp_yz(i), ngp_yz(i), MPI_REAL, type_yz(i), &
1028	ierr )
1029	CALL MPI_TYPE_COMMIT( type_yz(i), ierr )
1030
1031	nxl_l = nxl_l / 2
1032	nxr_l = nxr_l / 2
1033	nys_l = nys_l / 2
1034	nyn_l = nyn_l / 2
1035	nzt_l = nzt_l / 2
1036
1037	ENDDO
1038
1039	ENDIF
1040	!
1041	!-- Define data types for exchange of 3D Integer arrays.
1042	ngp_yz_int = (nzt - nzb + 2) * (nyn - nys + 1 + 2 * nbgp)
1043
1044	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2nbgp, nbgp(nzt-nzb+2), ngp_yz_int, &
1045	MPI_INTEGER, type_xz_int, ierr )
1046	CALL MPI_TYPE_COMMIT( type_xz_int, ierr )
1047
1048	CALL MPI_TYPE_VECTOR( nbgp, ngp_yz_int, ngp_yz_int, MPI_INTEGER, type_yz_int, &
1049	ierr )
1050	CALL MPI_TYPE_COMMIT( type_yz_int, ierr )
1051
1052	#endif
1053
1054	#if defined( __parallel ) && ! defined ( __check )
1055	!
1056	!-- Setting of flags for inflow/outflow conditions in case of non-cyclic
1057	!-- horizontal boundary conditions.
1058	IF ( pleft == MPI_PROC_NULL ) THEN
1059	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1060	inflow_l = .TRUE.
1061	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1062	outflow_l = .TRUE.
1063	ENDIF
1064	ENDIF
1065
1066	IF ( pright == MPI_PROC_NULL ) THEN
1067	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1068	outflow_r = .TRUE.
1069	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1070	inflow_r = .TRUE.
1071	ENDIF
1072	ENDIF
1073
1074	IF ( psouth == MPI_PROC_NULL ) THEN
1075	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1076	outflow_s = .TRUE.
1077	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1078	inflow_s = .TRUE.
1079	ENDIF
1080	ENDIF
1081
1082	IF ( pnorth == MPI_PROC_NULL ) THEN
1083	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1084	inflow_n = .TRUE.
1085	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1086	outflow_n = .TRUE.
1087	ENDIF
1088	ENDIF
1089
1090	!
1091	!-- Broadcast the id of the inflow PE
1092	IF ( inflow_l ) THEN
1093	id_inflow_l = myidx
1094	ELSE
1095	id_inflow_l = 0
1096	ENDIF
1097	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1098	CALL MPI_ALLREDUCE( id_inflow_l, id_inflow, 1, MPI_INTEGER, MPI_SUM, &
1099	comm1dx, ierr )
1100
1101	!
1102	!-- Broadcast the id of the recycling plane
1103	!-- WARNING: needs to be adjusted in case of inflows other than from left side!
1104	IF ( NINT( recycling_width / dx ) >= nxl .AND. &
1105	NINT( recycling_width / dx ) <= nxr ) THEN
1106	id_recycling_l = myidx
1107	ELSE
1108	id_recycling_l = 0
1109	ENDIF
1110	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1111	CALL MPI_ALLREDUCE( id_recycling_l, id_recycling, 1, MPI_INTEGER, MPI_SUM, &
1112	comm1dx, ierr )
1113
1114	CALL location_message( 'finished', .TRUE. )
1115
1116	#elif ! defined ( __parallel )
1117	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1118	inflow_l = .TRUE.
1119	outflow_r = .TRUE.
1120	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1121	outflow_l = .TRUE.
1122	inflow_r = .TRUE.
1123	ENDIF
1124
1125	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1126	inflow_n = .TRUE.
1127	outflow_s = .TRUE.
1128	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1129	outflow_n = .TRUE.
1130	inflow_s = .TRUE.
1131	ENDIF
1132	#endif
1133
1134	!
1135	!-- At the inflow or outflow, u or v, respectively, have to be calculated for
1136	!-- one more grid point.
1137	IF ( inflow_l .OR. outflow_l ) THEN
1138	nxlu = nxl + 1
1139	ELSE
1140	nxlu = nxl
1141	ENDIF
1142	IF ( inflow_s .OR. outflow_s ) THEN
1143	nysv = nys + 1
1144	ELSE
1145	nysv = nys
1146	ENDIF
1147
1148	!
1149	!-- Allocate wall flag arrays used in the multigrid solver
1150	IF ( psolver(1:9) == 'multigrid' ) THEN
1151
1152	DO i = maximum_grid_level, 1, -1
1153
1154	SELECT CASE ( i )
1155
1156	CASE ( 1 )
1157	ALLOCATE( wall_flags_1(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 ( 2 )
1162	ALLOCATE( wall_flags_2(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 ( 3 )
1167	ALLOCATE( wall_flags_3(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 ( 4 )
1172	ALLOCATE( wall_flags_4(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 ( 5 )
1177	ALLOCATE( wall_flags_5(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 ( 6 )
1182	ALLOCATE( wall_flags_6(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 ( 7 )
1187	ALLOCATE( wall_flags_7(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 ( 8 )
1192	ALLOCATE( wall_flags_8(nzb:nzt_mg(i)+1, &
1193	nys_mg(i)-1:nyn_mg(i)+1, &
1194	nxl_mg(i)-1:nxr_mg(i)+1) )
1195
1196	CASE ( 9 )
1197	ALLOCATE( wall_flags_9(nzb:nzt_mg(i)+1, &
1198	nys_mg(i)-1:nyn_mg(i)+1, &
1199	nxl_mg(i)-1:nxr_mg(i)+1) )
1200
1201	CASE ( 10 )
1202	ALLOCATE( wall_flags_10(nzb:nzt_mg(i)+1, &
1203	nys_mg(i)-1:nyn_mg(i)+1, &
1204	nxl_mg(i)-1:nxr_mg(i)+1) )
1205
1206	CASE DEFAULT
1207	message_string = 'more than 10 multigrid levels'
1208	CALL message( 'init_pegrid', 'PA0238', 1, 2, 0, 6, 0 )
1209
1210	END SELECT
1211
1212	ENDDO
1213
1214	ENDIF
1215
1216	!
1217	!-- Calculate the number of groups into which parallel I/O is split.
1218	!-- The default for files which are opened by all PEs (or where each
1219	!-- PE opens his own independent file) is, that all PEs are doing input/output
1220	!-- in parallel at the same time. This might cause performance or even more
1221	!-- severe problems depending on the configuration of the underlying file
1222	!-- system.
1223	!-- First, set the default:
1224	IF ( maximum_parallel_io_streams == -1 .OR. &
1225	maximum_parallel_io_streams > numprocs ) THEN
1226	maximum_parallel_io_streams = numprocs
1227	ENDIF
1228
1229	!
1230	!-- Now calculate the number of io_blocks and the io_group to which the
1231	!-- respective PE belongs. I/O of the groups is done in serial, but in parallel
1232	!-- for all PEs belonging to the same group. A preliminary setting with myid
1233	!-- based on MPI_COMM_WORLD has been done in parin.
1234	io_blocks = numprocs / maximum_parallel_io_streams
1235	io_group = MOD( myid+1, io_blocks )
1236
1237
1238	END SUBROUTINE init_pegrid

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