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source: palm/trunk/SOURCE/init_pegrid.f90 @ 1972

Last change on this file since 1972 was 1969, checked in by suehring, 8 years ago
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1	!> @file init_pegrid.f90
2	!--------------------------------------------------------------------------------!
3	! This file is part of PALM.
4	!
5	! PALM is free software: you can redistribute it and/or modify it under the terms
6	! of the GNU General Public License as published by the Free Software Foundation,
7	! either version 3 of the License, or (at your option) any later version.
8	!
9	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
10	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
11	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
12	!
13	! You should have received a copy of the GNU General Public License along with
14	! PALM. If not, see <http://www.gnu.org/licenses/>.
15	!
16	! Copyright 1997-2016 Leibniz Universitaet Hannover
17	!--------------------------------------------------------------------------------!
18	!
19	! Current revisions:
20	! ------------------
21	!
22	!
23	! Former revisions:
24	! -----------------
25	! $Id: init_pegrid.f90 1969 2016-07-18 12:03:12Z maronga $
26	!
27	! 1968 2016-07-18 12:01:49Z suehring
28	! Extent MPI-datatypes for exchange of 2D-INTEGER arrays on coarser multigrid
29	! level
30	!
31	! 1964 2016-07-14 15:35:18Z hellstea
32	! Bugfix: erroneous setting of nest_bound_l/r/s/n = .TRUE. for vertical nesting mode removed.
33	!
34	! 1923 2016-05-31 16:37:07Z boeske
35	! Initial version of purely vertical nesting introduced.
36	!
37	! 1922 2016-05-31 16:36:08Z boeske
38	! Bugfix: array transposition checks restricted to cases if a fourier
39	! transform is used , removed unused variable nnx_z
40	!
41	! 1833 2016-04-07 14:23:03Z raasch
42	! spectra related variables moved to spectra_mod
43	!
44	! 1815 2016-04-06 13:49:59Z raasch
45	! cpp-directives for intel openmp bug removed
46	!
47	! 1804 2016-04-05 16:30:18Z maronga
48	! Removed code for parameter file check (__check)
49	!
50	! 1779 2016-03-03 08:01:28Z raasch
51	! changes regarding nested domain removed: virtual PE grid will be automatically
52	! calculated for nested runs too
53	!
54	! 1764 2016-02-28 12:45:19Z raasch
55	! cpp-statements for nesting removed
56	!
57	! 1762 2016-02-25 12:31:13Z hellstea
58	! Introduction of nested domain feature
59	!
60	! 1682 2015-10-07 23:56:08Z knoop
61	! Code annotations made doxygen readable
62	!
63	! 1677 2015-10-02 13:25:23Z boeske
64	! New MPI-data types for exchange of 3D integer arrays.
65	!
66	! 1575 2015-03-27 09:56:27Z raasch
67	! adjustments for psolver-queries, calculation of ngp_xz added
68	!
69	! 1565 2015-03-09 20:59:31Z suehring
70	! Refine if-clause for setting nbgp.
71	!
72	! 1557 2015-03-05 16:43:04Z suehring
73	! Adjustment for monotonic limiter
74	!
75	! 1468 2014-09-24 14:06:57Z maronga
76	! Adapted for use on up to 6-digit processor cores
77	!
78	! 1435 2014-07-21 10:37:02Z keck
79	! bugfix: added missing parameter coupling_mode_remote to ONLY-attribute
80	!
81	! 1402 2014-05-09 14:25:13Z raasch
82	! location messages modified
83	!
84	! 1384 2014-05-02 14:31:06Z raasch
85	! location messages added
86	!
87	! 1353 2014-04-08 15:21:23Z heinze
88	! REAL constants provided with KIND-attribute
89	!
90	! 1322 2014-03-20 16:38:49Z raasch
91	! REAL functions provided with KIND-attribute
92	!
93	! 1320 2014-03-20 08:40:49Z raasch
94	! ONLY-attribute added to USE-statements,
95	! kind-parameters added to all INTEGER and REAL declaration statements,
96	! kinds are defined in new module kinds,
97	! revision history before 2012 removed,
98	! comment fields (!:) to be used for variable explanations added to
99	! all variable declaration statements
100	!
101	! 1304 2014-03-12 10:29:42Z raasch
102	! bugfix: single core MPI runs missed some settings of transpose indices
103	!
104	! 1212 2013-08-15 08:46:27Z raasch
105	! error message for poisfft_hybrid removed
106	!
107	! 1159 2013-05-21 11:58:22Z fricke
108	! dirichlet/neumann and neumann/dirichlet removed
109	!
110	! 1139 2013-04-18 07:25:03Z raasch
111	! bugfix for calculating the id of the PE carrying the recycling plane
112	!
113	! 1111 2013-03-08 23:54:10Z raasch
114	! initialization of poisfft moved to module poisfft
115	!
116	! 1092 2013-02-02 11:24:22Z raasch
117	! unused variables removed
118	!
119	! 1056 2012-11-16 15:28:04Z raasch
120	! Indices for arrays n.._mg start from zero due to definition of arrays f2 and
121	! p2 as automatic arrays in recursive subroutine next_mg_level
122	!
123	! 1041 2012-11-06 02:36:29Z raasch
124	! a 2d virtual processor topology is used by default for all machines
125	!
126	! 1036 2012-10-22 13:43:42Z raasch
127	! code put under GPL (PALM 3.9)
128	!
129	! 1003 2012-09-14 14:35:53Z raasch
130	! subdomains must have identical size (grid matching = "match" removed)
131	!
132	! 1001 2012-09-13 14:08:46Z raasch
133	! all actions concerning upstream-spline-method removed
134	!
135	! 978 2012-08-09 08:28:32Z fricke
136	! dirichlet/neumann and neumann/dirichlet added
137	! nxlu and nysv are also calculated for inflow boundary
138	!
139	! 809 2012-01-30 13:32:58Z maronga
140	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
141	!
142	! 807 2012-01-25 11:53:51Z maronga
143	! New cpp directive "__check" implemented which is used by check_namelist_files
144	!
145	! Revision 1.1 1997/07/24 11:15:09 raasch
146	! Initial revision
147	!
148	!
149	! Description:
150	! ------------
151	!> Determination of the virtual processor topology (if not prescribed by the
152	!> user)and computation of the grid point number and array bounds of the local
153	!> domains.
154	!------------------------------------------------------------------------------!
155	SUBROUTINE init_pegrid
156
157
158	USE control_parameters, &
159	ONLY: bc_lr, bc_ns, coupling_mode, coupling_mode_remote, &
160	coupling_topology, gathered_size, grid_level, &
161	grid_level_count, host, inflow_l, inflow_n, inflow_r, inflow_s, &
162	io_blocks, io_group, maximum_grid_level, &
163	maximum_parallel_io_streams, message_string, &
164	mg_switch_to_pe0_level, momentum_advec, nest_bound_l, &
165	nest_bound_n, nest_bound_r, nest_bound_s, nest_domain, neutral, &
166	psolver, outflow_l, outflow_n, outflow_r, outflow_s, &
167	recycling_width, scalar_advec, subdomain_size
168
169	USE grid_variables, &
170	ONLY: dx
171
172	USE indices, &
173	ONLY: mg_loc_ind, nbgp, nnx, nny, nnz, nx, nx_a, nx_o, nxl, nxl_mg, &
174	nxlu, nxr, nxr_mg, ny, ny_a, ny_o, nyn, nyn_mg, nys, nys_mg, &
175	nysv, nz, nzb, nzt, nzt_mg, wall_flags_1, wall_flags_2, &
176	wall_flags_3, wall_flags_4, wall_flags_5, wall_flags_6, &
177	wall_flags_7, wall_flags_8, wall_flags_9, wall_flags_10
178
179	USE kinds
180
181	USE pegrid
182
183	USE pmc_interface, &
184	ONLY: nesting_mode
185
186	USE spectra_mod, &
187	ONLY: calculate_spectra, dt_dosp
188
189	USE transpose_indices, &
190	ONLY: nxl_y, nxl_yd, nxl_z, nxr_y, nxr_yd, nxr_z, nyn_x, nyn_z, nys_x,&
191	nys_z, nzb_x, nzb_y, nzb_yd, nzt_x, nzt_yd, nzt_y
192
193	IMPLICIT NONE
194
195	INTEGER(iwp) :: i !<
196	INTEGER(iwp) :: id_inflow_l !<
197	INTEGER(iwp) :: id_recycling_l !<
198	INTEGER(iwp) :: ind(5) !<
199	INTEGER(iwp) :: j !<
200	INTEGER(iwp) :: k !<
201	INTEGER(iwp) :: maximum_grid_level_l !<
202	INTEGER(iwp) :: mg_levels_x !<
203	INTEGER(iwp) :: mg_levels_y !<
204	INTEGER(iwp) :: mg_levels_z !<
205	INTEGER(iwp) :: mg_switch_to_pe0_level_l !<
206	INTEGER(iwp) :: nnx_y !<
207	INTEGER(iwp) :: nnx_z !<
208	INTEGER(iwp) :: nny_x !<
209	INTEGER(iwp) :: nny_z !<
210	INTEGER(iwp) :: nnz_x !<
211	INTEGER(iwp) :: nnz_y !<
212	INTEGER(iwp) :: numproc_sqr !<
213	INTEGER(iwp) :: nxl_l !<
214	INTEGER(iwp) :: nxr_l !<
215	INTEGER(iwp) :: nyn_l !<
216	INTEGER(iwp) :: nys_l !<
217	INTEGER(iwp) :: nzb_l !<
218	INTEGER(iwp) :: nzt_l !<
219	INTEGER(iwp) :: omp_get_num_threads !<
220
221	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: ind_all !<
222	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxlf !<
223	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxrf !<
224	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nynf !<
225	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nysf !<
226
227	INTEGER(iwp), DIMENSION(2) :: pdims_remote !<
228
229	#if defined( __mpi2 )
230	LOGICAL :: found !<
231	#endif
232
233	!
234	!-- Get the number of OpenMP threads
235	!$OMP PARALLEL
236	!$ threads_per_task = omp_get_num_threads()
237	!$OMP END PARALLEL
238
239
240	#if defined( __parallel )
241
242	CALL location_message( 'creating virtual PE grids + MPI derived data types', &
243	.FALSE. )
244
245	!
246	!-- Determine the processor topology or check it, if prescribed by the user
247	IF ( npex == -1 .AND. npey == -1 ) THEN
248
249	!
250	!-- Automatic determination of the topology
251	numproc_sqr = SQRT( REAL( numprocs, KIND=wp ) )
252	pdims(1) = MAX( numproc_sqr , 1 )
253	DO WHILE ( MOD( numprocs , pdims(1) ) /= 0 )
254	pdims(1) = pdims(1) - 1
255	ENDDO
256	pdims(2) = numprocs / pdims(1)
257
258	ELSEIF ( npex /= -1 .AND. npey /= -1 ) THEN
259
260	!
261	!-- Prescribed by user. Number of processors on the prescribed topology
262	!-- must be equal to the number of PEs available to the job
263	IF ( ( npex * npey ) /= numprocs ) THEN
264	WRITE( message_string, * ) 'number of PEs of the prescribed ', &
265	'topology (', npex*npey,') does not match & the number of ', &
266	'PEs available to the job (', numprocs, ')'
267	CALL message( 'init_pegrid', 'PA0221', 1, 2, 0, 6, 0 )
268	ENDIF
269	pdims(1) = npex
270	pdims(2) = npey
271
272	ELSE
273	!
274	!-- If the processor topology is prescribed by the user, the number of
275	!-- PEs must be given in both directions
276	message_string = 'if the processor topology is prescribed by th' // &
277	'e user& both values of "npex" and "npey" must be given' // &
278	' in the &NAMELIST-parameter file'
279	CALL message( 'init_pegrid', 'PA0222', 1, 2, 0, 6, 0 )
280
281	ENDIF
282
283	!
284	!-- For communication speedup, set barriers in front of collective
285	!-- communications by default on SGI-type systems
286	IF ( host(3:5) == 'sgi' ) collective_wait = .TRUE.
287
288	!
289	!-- If necessary, set horizontal boundary conditions to non-cyclic
290	IF ( bc_lr /= 'cyclic' ) cyclic(1) = .FALSE.
291	IF ( bc_ns /= 'cyclic' ) cyclic(2) = .FALSE.
292
293
294	!
295	!-- Create the virtual processor grid
296	CALL MPI_CART_CREATE( comm_palm, ndim, pdims, cyclic, reorder, &
297	comm2d, ierr )
298	CALL MPI_COMM_RANK( comm2d, myid, ierr )
299	WRITE (myid_char,'(''_'',I6.6)') myid
300
301	CALL MPI_CART_COORDS( comm2d, myid, ndim, pcoord, ierr )
302	CALL MPI_CART_SHIFT( comm2d, 0, 1, pleft, pright, ierr )
303	CALL MPI_CART_SHIFT( comm2d, 1, 1, psouth, pnorth, ierr )
304
305	!
306	!-- Determine sub-topologies for transpositions
307	!-- Transposition from z to x:
308	remain_dims(1) = .TRUE.
309	remain_dims(2) = .FALSE.
310	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dx, ierr )
311	CALL MPI_COMM_RANK( comm1dx, myidx, ierr )
312	!
313	!-- Transposition from x to y
314	remain_dims(1) = .FALSE.
315	remain_dims(2) = .TRUE.
316	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dy, ierr )
317	CALL MPI_COMM_RANK( comm1dy, myidy, ierr )
318
319
320	!
321	!-- Calculate array bounds along x-direction for every PE.
322	ALLOCATE( nxlf(0:pdims(1)-1), nxrf(0:pdims(1)-1), nynf(0:pdims(2)-1), &
323	nysf(0:pdims(2)-1) )
324
325	IF ( MOD( nx+1 , pdims(1) ) /= 0 ) THEN
326	WRITE( message_string, * ) 'x-direction: gridpoint number (',nx+1,') ',&
327	'is not an& integral divisor of the number ', &
328	'processors (', pdims(1),')'
329	CALL message( 'init_pegrid', 'PA0225', 1, 2, 0, 6, 0 )
330	ELSE
331	nnx = ( nx + 1 ) / pdims(1)
332	IF ( nnx*pdims(1) - ( nx + 1) > nnx ) THEN
333	WRITE( message_string, * ) 'x-direction: nx does not match the', &
334	'requirements given by the number of PEs &used', &
335	'& please use nx = ', nx - ( pdims(1) - ( nnx*pdims(1) &
336	- ( nx + 1 ) ) ), ' instead of nx =', nx
337	CALL message( 'init_pegrid', 'PA0226', 1, 2, 0, 6, 0 )
338	ENDIF
339	ENDIF
340
341	!
342	!-- Left and right array bounds, number of gridpoints
343	DO i = 0, pdims(1)-1
344	nxlf(i) = i * nnx
345	nxrf(i) = ( i + 1 ) * nnx - 1
346	ENDDO
347
348	!
349	!-- Calculate array bounds in y-direction for every PE.
350	IF ( MOD( ny+1 , pdims(2) ) /= 0 ) THEN
351	WRITE( message_string, * ) 'y-direction: gridpoint number (',ny+1,') ', &
352	'is not an& integral divisor of the number of', &
353	'processors (', pdims(2),')'
354	CALL message( 'init_pegrid', 'PA0227', 1, 2, 0, 6, 0 )
355	ELSE
356	nny = ( ny + 1 ) / pdims(2)
357	IF ( nny*pdims(2) - ( ny + 1) > nny ) THEN
358	WRITE( message_string, * ) 'y-direction: ny does not match the', &
359	'requirements given by the number of PEs &used ', &
360	'& please use ny = ', ny - ( pdims(2) - ( nnx*pdims(2) &
361	- ( ny + 1 ) ) ), ' instead of ny =', ny
362	CALL message( 'init_pegrid', 'PA0228', 1, 2, 0, 6, 0 )
363	ENDIF
364	ENDIF
365
366	!
367	!-- South and north array bounds
368	DO j = 0, pdims(2)-1
369	nysf(j) = j * nny
370	nynf(j) = ( j + 1 ) * nny - 1
371	ENDDO
372
373	!
374	!-- Local array bounds of the respective PEs
375	nxl = nxlf(pcoord(1))
376	nxr = nxrf(pcoord(1))
377	nys = nysf(pcoord(2))
378	nyn = nynf(pcoord(2))
379	nzb = 0
380	nzt = nz
381	nnz = nz
382
383	!
384	!-- Set switches to define if the PE is situated at the border of the virtual
385	!-- processor grid
386	IF ( nxl == 0 ) left_border_pe = .TRUE.
387	IF ( nxr == nx ) right_border_pe = .TRUE.
388	IF ( nys == 0 ) south_border_pe = .TRUE.
389	IF ( nyn == ny ) north_border_pe = .TRUE.
390
391	!
392	!-- Calculate array bounds and gridpoint numbers for the transposed arrays
393	!-- (needed in the pressure solver)
394	!-- For the transposed arrays, cyclic boundaries as well as top and bottom
395	!-- boundaries are omitted, because they are obstructive to the transposition
396
397	!
398	!-- 1. transposition z --> x
399	!-- This transposition is not neccessary in case of a 1d-decomposition along x
400	IF ( psolver == 'poisfft' .OR. calculate_spectra ) THEN
401
402	IF ( pdims(2) /= 1 ) THEN
403	IF ( MOD( nz , pdims(1) ) /= 0 ) THEN
404	WRITE( message_string, * ) 'transposition z --> x:', &
405	'&nz=',nz,' is not an integral divisior of pdims(1)=', &
406	pdims(1)
407	CALL message( 'init_pegrid', 'PA0230', 1, 2, 0, 6, 0 )
408	ENDIF
409	ENDIF
410
411	nys_x = nys
412	nyn_x = nyn
413	nny_x = nny
414	nnz_x = nz / pdims(1)
415	nzb_x = 1 + myidx * nnz_x
416	nzt_x = ( myidx + 1 ) * nnz_x
417	sendrecvcount_zx = nnx * nny * nnz_x
418
419	ENDIF
420
421
422	IF ( psolver == 'poisfft' ) THEN
423	!
424	!-- 2. transposition x --> y
425	IF ( MOD( nx+1 , pdims(2) ) /= 0 ) THEN
426	WRITE( message_string, * ) 'transposition x --> y:', &
427	'&nx+1=',nx+1,' is not an integral divisor of ', &
428	'pdims(2)=',pdims(2)
429	CALL message( 'init_pegrid', 'PA0231', 1, 2, 0, 6, 0 )
430	ENDIF
431
432	nnz_y = nnz_x
433	nzb_y = nzb_x
434	nzt_y = nzt_x
435	nnx_y = (nx+1) / pdims(2)
436	nxl_y = myidy * nnx_y
437	nxr_y = ( myidy + 1 ) * nnx_y - 1
438	sendrecvcount_xy = nnx_y * nny_x * nnz_y
439	!
440	!-- 3. transposition y --> z
441	!-- (ELSE: x --> y in case of 1D-decomposition along x)
442	nxl_z = nxl_y
443	nxr_z = nxr_y
444	nny_z = (ny+1) / pdims(1)
445	nys_z = myidx * nny_z
446	nyn_z = ( myidx + 1 ) * nny_z - 1
447	sendrecvcount_yz = nnx_y * nny_z * nnz_y
448
449	IF ( pdims(2) /= 1 ) THEN
450	!
451	!-- y --> z
452	!-- This transposition is not neccessary in case of a 1d-decomposition
453	!-- along x, except that the uptream-spline method is switched on
454	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
455	WRITE( message_string, * ) 'transposition y --> z:', &
456	'& ny+1=',ny+1,' is not an integral divisor of',&
457	' pdims(1)=',pdims(1)
458	CALL message( 'init_pegrid', 'PA0232', 1, 2, 0, 6, 0 )
459	ENDIF
460
461	ELSE
462	!
463	!-- x --> y
464	!-- This condition must be fulfilled for a 1D-decomposition along x
465	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
466	WRITE( message_string, * ) 'transposition x --> y:', &
467	'& ny+1=',ny+1,' is not an integral divisor of',&
468	' pdims(1)=',pdims(1)
469	CALL message( 'init_pegrid', 'PA0233', 1, 2, 0, 6, 0 )
470	ENDIF
471
472	ENDIF
473
474	ENDIF
475
476	!
477	!-- Indices for direct transpositions z --> y (used for calculating spectra)
478	IF ( calculate_spectra ) THEN
479	IF ( MOD( nz, pdims(2) ) /= 0 ) THEN
480	WRITE( message_string, * ) 'direct transposition z --> y (needed ', &
481	'for spectra):& nz=',nz,' is not an integral divisor of ', &
482	'pdims(2)=',pdims(2)
483	CALL message( 'init_pegrid', 'PA0234', 1, 2, 0, 6, 0 )
484	ELSE
485	nxl_yd = nxl
486	nxr_yd = nxr
487	nzb_yd = 1 + myidy * ( nz / pdims(2) )
488	nzt_yd = ( myidy + 1 ) * ( nz / pdims(2) )
489	sendrecvcount_zyd = nnx * nny * ( nz / pdims(2) )
490	ENDIF
491	ENDIF
492
493	IF ( psolver == 'poisfft' .OR. calculate_spectra ) THEN
494	!
495	!-- Indices for direct transpositions y --> x
496	!-- (they are only possible in case of a 1d-decomposition along x)
497	IF ( pdims(2) == 1 ) THEN
498	nny_x = nny / pdims(1)
499	nys_x = myid * nny_x
500	nyn_x = ( myid + 1 ) * nny_x - 1
501	nzb_x = 1
502	nzt_x = nz
503	sendrecvcount_xy = nnx * nny_x * nz
504	ENDIF
505
506	ENDIF
507
508	IF ( psolver == 'poisfft' ) THEN
509	!
510	!-- Indices for direct transpositions x --> y
511	!-- (they are only possible in case of a 1d-decomposition along y)
512	IF ( pdims(1) == 1 ) THEN
513	nnx_y = nnx / pdims(2)
514	nxl_y = myid * nnx_y
515	nxr_y = ( myid + 1 ) * nnx_y - 1
516	nzb_y = 1
517	nzt_y = nz
518	sendrecvcount_xy = nnx_y * nny * nz
519	ENDIF
520
521	ENDIF
522
523	!
524	!-- Arrays for storing the array bounds are needed any more
525	DEALLOCATE( nxlf , nxrf , nynf , nysf )
526
527
528	!
529	!-- Collect index bounds from other PEs (to be written to restart file later)
530	ALLOCATE( hor_index_bounds(4,0:numprocs-1) )
531
532	IF ( myid == 0 ) THEN
533
534	hor_index_bounds(1,0) = nxl
535	hor_index_bounds(2,0) = nxr
536	hor_index_bounds(3,0) = nys
537	hor_index_bounds(4,0) = nyn
538
539	!
540	!-- Receive data from all other PEs
541	DO i = 1, numprocs-1
542	CALL MPI_RECV( ibuf, 4, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
543	ierr )
544	hor_index_bounds(:,i) = ibuf(1:4)
545	ENDDO
546
547	ELSE
548	!
549	!-- Send index bounds to PE0
550	ibuf(1) = nxl
551	ibuf(2) = nxr
552	ibuf(3) = nys
553	ibuf(4) = nyn
554	CALL MPI_SEND( ibuf, 4, MPI_INTEGER, 0, myid, comm2d, ierr )
555
556	ENDIF
557
558
559	#if defined( __print )
560	!
561	!-- Control output
562	IF ( myid == 0 ) THEN
563	PRINT, ' processor topology *'
564	PRINT*, ' '
565	PRINT*, 'myid pcoord left right south north idx idy nxl: nxr',&
566	&' nys: nyn'
567	PRINT*, '------------------------------------------------------------',&
568	&'-----------'
569	WRITE (*,1000) 0, pcoord(1), pcoord(2), pleft, pright, psouth, pnorth, &
570	myidx, myidy, nxl, nxr, nys, nyn
571	1000 FORMAT (I4,2X,'(',I3,',',I3,')',3X,I4,2X,I4,3X,I4,2X,I4,2X,I3,1X,I3, &
572	2(2X,I4,':',I4))
573
574	!
575	!-- Receive data from the other PEs
576	DO i = 1,numprocs-1
577	CALL MPI_RECV( ibuf, 12, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
578	ierr )
579	WRITE (*,1000) i, ( ibuf(j) , j = 1,12 )
580	ENDDO
581	ELSE
582
583	!
584	!-- Send data to PE0
585	ibuf(1) = pcoord(1); ibuf(2) = pcoord(2); ibuf(3) = pleft
586	ibuf(4) = pright; ibuf(5) = psouth; ibuf(6) = pnorth; ibuf(7) = myidx
587	ibuf(8) = myidy; ibuf(9) = nxl; ibuf(10) = nxr; ibuf(11) = nys
588	ibuf(12) = nyn
589	CALL MPI_SEND( ibuf, 12, MPI_INTEGER, 0, myid, comm2d, ierr )
590	ENDIF
591	#endif
592
593	#if defined( __parallel )
594	#if defined( __mpi2 )
595	!
596	!-- In case of coupled runs, get the port name on PE0 of the atmosphere model
597	!-- and pass it to PE0 of the ocean model
598	IF ( myid == 0 ) THEN
599
600	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
601
602	CALL MPI_OPEN_PORT( MPI_INFO_NULL, port_name, ierr )
603
604	CALL MPI_PUBLISH_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, &
605	ierr )
606
607	!
608	!-- Write a flag file for the ocean model and the other atmosphere
609	!-- processes.
610	!-- There seems to be a bug in MPICH2 which causes hanging processes
611	!-- in case that execution of LOOKUP_NAME is continued too early
612	!-- (i.e. before the port has been created)
613	OPEN( 90, FILE='COUPLING_PORT_OPENED', FORM='FORMATTED' )
614	WRITE ( 90, '(''TRUE'')' )
615	CLOSE ( 90 )
616
617	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
618
619	!
620	!-- Continue only if the atmosphere model has created the port.
621	!-- There seems to be a bug in MPICH2 which causes hanging processes
622	!-- in case that execution of LOOKUP_NAME is continued too early
623	!-- (i.e. before the port has been created)
624	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
625	DO WHILE ( .NOT. found )
626	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
627	ENDDO
628
629	CALL MPI_LOOKUP_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, ierr )
630
631	ENDIF
632
633	ENDIF
634
635	!
636	!-- In case of coupled runs, establish the connection between the atmosphere
637	!-- and the ocean model and define the intercommunicator (comm_inter)
638	CALL MPI_BARRIER( comm2d, ierr )
639	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
640
641	CALL MPI_COMM_ACCEPT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
642	comm_inter, ierr )
643	coupling_mode_remote = 'ocean_to_atmosphere'
644
645	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
646
647	CALL MPI_COMM_CONNECT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
648	comm_inter, ierr )
649	coupling_mode_remote = 'atmosphere_to_ocean'
650
651	ENDIF
652	#endif
653
654	!
655	!-- Determine the number of ghost point layers
656	IF ( ( scalar_advec == 'ws-scheme' .AND. .NOT. neutral ) .OR. &
657	scalar_advec == 'ws-scheme-mono' .OR. &
658	momentum_advec == 'ws-scheme' ) THEN
659	nbgp = 3
660	ELSE
661	nbgp = 1
662	ENDIF
663
664	!
665	!-- Create a new MPI derived datatype for the exchange of surface (xy) data,
666	!-- which is needed for coupled atmosphere-ocean runs.
667	!-- First, calculate number of grid points of an xy-plane.
668	ngp_xy = ( nxr - nxl + 1 + 2 * nbgp ) * ( nyn - nys + 1 + 2 * nbgp )
669	CALL MPI_TYPE_VECTOR( ngp_xy, 1, nzt-nzb+2, MPI_REAL, type_xy, ierr )
670	CALL MPI_TYPE_COMMIT( type_xy, ierr )
671
672	IF ( TRIM( coupling_mode ) /= 'uncoupled' ) THEN
673
674	!
675	!-- Pass the number of grid points of the atmosphere model to
676	!-- the ocean model and vice versa
677	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
678
679	nx_a = nx
680	ny_a = ny
681
682	IF ( myid == 0 ) THEN
683
684	CALL MPI_SEND( nx_a, 1, MPI_INTEGER, numprocs, 1, comm_inter, &
685	ierr )
686	CALL MPI_SEND( ny_a, 1, MPI_INTEGER, numprocs, 2, comm_inter, &
687	ierr )
688	CALL MPI_SEND( pdims, 2, MPI_INTEGER, numprocs, 3, comm_inter, &
689	ierr )
690	CALL MPI_RECV( nx_o, 1, MPI_INTEGER, numprocs, 4, comm_inter, &
691	status, ierr )
692	CALL MPI_RECV( ny_o, 1, MPI_INTEGER, numprocs, 5, comm_inter, &
693	status, ierr )
694	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, numprocs, 6, &
695	comm_inter, status, ierr )
696	ENDIF
697
698	CALL MPI_BCAST( nx_o, 1, MPI_INTEGER, 0, comm2d, ierr )
699	CALL MPI_BCAST( ny_o, 1, MPI_INTEGER, 0, comm2d, ierr )
700	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr )
701
702	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
703
704	nx_o = nx
705	ny_o = ny
706
707	IF ( myid == 0 ) THEN
708
709	CALL MPI_RECV( nx_a, 1, MPI_INTEGER, 0, 1, comm_inter, status, &
710	ierr )
711	CALL MPI_RECV( ny_a, 1, MPI_INTEGER, 0, 2, comm_inter, status, &
712	ierr )
713	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, 0, 3, comm_inter, &
714	status, ierr )
715	CALL MPI_SEND( nx_o, 1, MPI_INTEGER, 0, 4, comm_inter, ierr )
716	CALL MPI_SEND( ny_o, 1, MPI_INTEGER, 0, 5, comm_inter, ierr )
717	CALL MPI_SEND( pdims, 2, MPI_INTEGER, 0, 6, comm_inter, ierr )
718	ENDIF
719
720	CALL MPI_BCAST( nx_a, 1, MPI_INTEGER, 0, comm2d, ierr)
721	CALL MPI_BCAST( ny_a, 1, MPI_INTEGER, 0, comm2d, ierr)
722	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr)
723
724	ENDIF
725
726	ngp_a = ( nx_a+1 + 2 * nbgp ) * ( ny_a+1 + 2 * nbgp )
727	ngp_o = ( nx_o+1 + 2 * nbgp ) * ( ny_o+1 + 2 * nbgp )
728
729	!
730	!-- Determine if the horizontal grid and the number of PEs in ocean and
731	!-- atmosphere is same or not
732	IF ( nx_o == nx_a .AND. ny_o == ny_a .AND. &
733	pdims(1) == pdims_remote(1) .AND. pdims(2) == pdims_remote(2) ) &
734	THEN
735	coupling_topology = 0
736	ELSE
737	coupling_topology = 1
738	ENDIF
739
740	!
741	!-- Determine the target PEs for the exchange between ocean and
742	!-- atmosphere (comm2d)
743	IF ( coupling_topology == 0 ) THEN
744	!
745	!-- In case of identical topologies, every atmosphere PE has exactly one
746	!-- ocean PE counterpart and vice versa
747	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
748	target_id = myid + numprocs
749	ELSE
750	target_id = myid
751	ENDIF
752
753	ELSE
754	!
755	!-- In case of nonequivalent topology in ocean and atmosphere only for
756	!-- PE0 in ocean and PE0 in atmosphere a target_id is needed, since
757	!-- data echxchange between ocean and atmosphere will be done only
758	!-- between these PEs.
759	IF ( myid == 0 ) THEN
760
761	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
762	target_id = numprocs
763	ELSE
764	target_id = 0
765	ENDIF
766
767	ENDIF
768
769	ENDIF
770
771	ENDIF
772
773
774	#endif
775
776	#else
777
778	!
779	!-- Array bounds when running on a single PE (respectively a non-parallel
780	!-- machine)
781	nxl = 0
782	nxr = nx
783	nnx = nxr - nxl + 1
784	nys = 0
785	nyn = ny
786	nny = nyn - nys + 1
787	nzb = 0
788	nzt = nz
789	nnz = nz
790
791	ALLOCATE( hor_index_bounds(4,0:0) )
792	hor_index_bounds(1,0) = nxl
793	hor_index_bounds(2,0) = nxr
794	hor_index_bounds(3,0) = nys
795	hor_index_bounds(4,0) = nyn
796
797	!
798	!-- Array bounds for the pressure solver (in the parallel code, these bounds
799	!-- are the ones for the transposed arrays)
800	nys_x = nys
801	nyn_x = nyn
802	nzb_x = nzb + 1
803	nzt_x = nzt
804
805	nxl_y = nxl
806	nxr_y = nxr
807	nzb_y = nzb + 1
808	nzt_y = nzt
809
810	nxl_z = nxl
811	nxr_z = nxr
812	nys_z = nys
813	nyn_z = nyn
814
815	#endif
816
817	!
818	!-- Calculate number of grid levels necessary for the multigrid poisson solver
819	!-- as well as the gridpoint indices on each level
820	IF ( psolver(1:9) == 'multigrid' ) THEN
821
822	!
823	!-- First calculate number of possible grid levels for the subdomains
824	mg_levels_x = 1
825	mg_levels_y = 1
826	mg_levels_z = 1
827
828	i = nnx
829	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
830	i = i / 2
831	mg_levels_x = mg_levels_x + 1
832	ENDDO
833
834	j = nny
835	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
836	j = j / 2
837	mg_levels_y = mg_levels_y + 1
838	ENDDO
839
840	k = nz ! do not use nnz because it might be > nz due to transposition
841	! requirements
842	DO WHILE ( MOD( k, 2 ) == 0 .AND. k /= 2 )
843	k = k / 2
844	mg_levels_z = mg_levels_z + 1
845	ENDDO
846
847	maximum_grid_level = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
848
849	!
850	!-- Find out, if the total domain allows more levels. These additional
851	!-- levels are identically processed on all PEs.
852	IF ( numprocs > 1 .AND. mg_switch_to_pe0_level /= -1 ) THEN
853
854	IF ( mg_levels_z > MIN( mg_levels_x, mg_levels_y ) ) THEN
855
856	mg_switch_to_pe0_level_l = maximum_grid_level
857
858	mg_levels_x = 1
859	mg_levels_y = 1
860
861	i = nx+1
862	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
863	i = i / 2
864	mg_levels_x = mg_levels_x + 1
865	ENDDO
866
867	j = ny+1
868	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
869	j = j / 2
870	mg_levels_y = mg_levels_y + 1
871	ENDDO
872
873	maximum_grid_level_l = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
874
875	IF ( maximum_grid_level_l > mg_switch_to_pe0_level_l ) THEN
876	mg_switch_to_pe0_level_l = maximum_grid_level_l - &
877	mg_switch_to_pe0_level_l + 1
878	ELSE
879	mg_switch_to_pe0_level_l = 0
880	ENDIF
881
882	ELSE
883	mg_switch_to_pe0_level_l = 0
884	maximum_grid_level_l = maximum_grid_level
885
886	ENDIF
887
888	!
889	!-- Use switch level calculated above only if it is not pre-defined
890	!-- by user
891	IF ( mg_switch_to_pe0_level == 0 ) THEN
892	IF ( mg_switch_to_pe0_level_l /= 0 ) THEN
893	mg_switch_to_pe0_level = mg_switch_to_pe0_level_l
894	maximum_grid_level = maximum_grid_level_l
895	ENDIF
896
897	ELSE
898	!
899	!-- Check pre-defined value and reset to default, if neccessary
900	IF ( mg_switch_to_pe0_level < mg_switch_to_pe0_level_l .OR. &
901	mg_switch_to_pe0_level >= maximum_grid_level_l ) THEN
902	message_string = 'mg_switch_to_pe0_level ' // &
903	'out of range and reset to default (=0)'
904	CALL message( 'init_pegrid', 'PA0235', 0, 1, 0, 6, 0 )
905	mg_switch_to_pe0_level = 0
906	ELSE
907	!
908	!-- Use the largest number of possible levels anyway and recalculate
909	!-- the switch level to this largest number of possible values
910	maximum_grid_level = maximum_grid_level_l
911
912	ENDIF
913
914	ENDIF
915
916	ENDIF
917
918	ALLOCATE( grid_level_count(maximum_grid_level), &
919	nxl_mg(0:maximum_grid_level), nxr_mg(0:maximum_grid_level), &
920	nyn_mg(0:maximum_grid_level), nys_mg(0:maximum_grid_level), &
921	nzt_mg(0:maximum_grid_level) )
922
923	grid_level_count = 0
924	!
925	!-- Index zero required as dummy due to definition of arrays f2 and p2 in
926	!-- recursive subroutine next_mg_level
927	nxl_mg(0) = 0; nxr_mg(0) = 0; nyn_mg(0) = 0; nys_mg(0) = 0; nzt_mg(0) = 0
928
929	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzt_l = nzt
930
931	DO i = maximum_grid_level, 1 , -1
932
933	IF ( i == mg_switch_to_pe0_level ) THEN
934	#if defined( __parallel )
935	!
936	!-- Save the grid size of the subdomain at the switch level, because
937	!-- it is needed in poismg.
938	ind(1) = nxl_l; ind(2) = nxr_l
939	ind(3) = nys_l; ind(4) = nyn_l
940	ind(5) = nzt_l
941	ALLOCATE( ind_all(5*numprocs), mg_loc_ind(5,0:numprocs-1) )
942	CALL MPI_ALLGATHER( ind, 5, MPI_INTEGER, ind_all, 5, &
943	MPI_INTEGER, comm2d, ierr )
944	DO j = 0, numprocs-1
945	DO k = 1, 5
946	mg_loc_ind(k,j) = ind_all(k+j*5)
947	ENDDO
948	ENDDO
949	DEALLOCATE( ind_all )
950	!
951	!-- Calculate the grid size of the total domain
952	nxr_l = ( nxr_l-nxl_l+1 ) * pdims(1) - 1
953	nxl_l = 0
954	nyn_l = ( nyn_l-nys_l+1 ) * pdims(2) - 1
955	nys_l = 0
956	!
957	!-- The size of this gathered array must not be larger than the
958	!-- array tend, which is used in the multigrid scheme as a temporary
959	!-- array. Therefore the subdomain size of an PE is calculated and
960	!-- the size of the gathered grid. These values are used in
961	!-- routines pres and poismg
962	subdomain_size = ( nxr - nxl + 2 * nbgp + 1 ) * &
963	( nyn - nys + 2 * nbgp + 1 ) * ( nzt - nzb + 2 )
964	gathered_size = ( nxr_l - nxl_l + 3 ) * ( nyn_l - nys_l + 3 ) * &
965	( nzt_l - nzb + 2 )
966
967	#else
968	message_string = 'multigrid gather/scatter impossible ' // &
969	'in non parallel mode'
970	CALL message( 'init_pegrid', 'PA0237', 1, 2, 0, 6, 0 )
971	#endif
972	ENDIF
973
974	nxl_mg(i) = nxl_l
975	nxr_mg(i) = nxr_l
976	nys_mg(i) = nys_l
977	nyn_mg(i) = nyn_l
978	nzt_mg(i) = nzt_l
979
980	nxl_l = nxl_l / 2
981	nxr_l = nxr_l / 2
982	nys_l = nys_l / 2
983	nyn_l = nyn_l / 2
984	nzt_l = nzt_l / 2
985
986	ENDDO
987
988	!
989	!-- Temporary problem: Currently calculation of maxerror iin routine poismg crashes
990	!-- if grid data are collected on PE0 already on the finest grid level.
991	!-- To be solved later.
992	IF ( maximum_grid_level == mg_switch_to_pe0_level ) THEN
993	message_string = 'grid coarsening on subdomain level cannot be performed'
994	CALL message( 'poismg', 'PA0236', 1, 2, 0, 6, 0 )
995	ENDIF
996
997	ELSE
998
999	maximum_grid_level = 0
1000
1001	ENDIF
1002
1003	!
1004	!-- Default level 0 tells exchange_horiz that all ghost planes have to be
1005	!-- exchanged. grid_level is adjusted in poismg, where only one ghost plane
1006	!-- is required.
1007	grid_level = 0
1008
1009	#if defined( __parallel )
1010	!
1011	!-- Gridpoint number for the exchange of ghost points (y-line for 2D-arrays)
1012	ngp_y = nyn - nys + 1 + 2 * nbgp
1013
1014	!
1015	!-- Define new MPI derived datatypes for the exchange of ghost points in
1016	!-- x- and y-direction for 2D-arrays (line)
1017	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_REAL, type_x, &
1018	ierr )
1019	CALL MPI_TYPE_COMMIT( type_x, ierr )
1020
1021	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_REAL, type_y, ierr )
1022	CALL MPI_TYPE_COMMIT( type_y, ierr )
1023	!
1024	!-- Define new MPI derived datatypes for the exchange of ghost points in
1025	!-- x- and y-direction for 2D-INTEGER arrays (line) - on normal grid
1026	ALLOCATE( type_x_int(0:maximum_grid_level), &
1027	type_y_int(0:maximum_grid_level) )
1028
1029	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_INTEGER, &
1030	type_x_int(0), ierr )
1031	CALL MPI_TYPE_COMMIT( type_x_int(0), ierr )
1032
1033	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_INTEGER, type_y_int(0), ierr )
1034	CALL MPI_TYPE_COMMIT( type_y_int(0), ierr )
1035	!
1036	!-- Calculate gridpoint numbers for the exchange of ghost points along x
1037	!-- (yz-plane for 3D-arrays) and define MPI derived data type(s) for the
1038	!-- exchange of ghost points in y-direction (xz-plane).
1039	!-- Do these calculations for the model grid and (if necessary) also
1040	!-- for the coarser grid levels used in the multigrid method
1041	ALLOCATE ( ngp_xz(0:maximum_grid_level), ngp_yz(0:maximum_grid_level), &
1042	type_xz(0:maximum_grid_level), type_yz(0:maximum_grid_level) )
1043
1044	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzb_l = nzb; nzt_l = nzt
1045
1046	!
1047	!-- Discern between the model grid, which needs nbgp ghost points and
1048	!-- grid levels for the multigrid scheme. In the latter case only one
1049	!-- ghost point is necessary.
1050	!-- First definition of MPI-datatypes for exchange of ghost layers on normal
1051	!-- grid. The following loop is needed for data exchange in poismg.f90.
1052	!
1053	!-- Determine number of grid points of yz-layer for exchange
1054	ngp_yz(0) = (nzt - nzb + 2) * (nyn - nys + 1 + 2 * nbgp)
1055
1056	!
1057	!-- Define an MPI-datatype for the exchange of left/right boundaries.
1058	!-- Although data are contiguous in physical memory (which does not
1059	!-- necessarily require an MPI-derived datatype), the data exchange between
1060	!-- left and right PE's using the MPI-derived type is 10% faster than without.
1061	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2nbgp, nbgp(nzt-nzb+2), ngp_yz(0), &
1062	MPI_REAL, type_xz(0), ierr )
1063	CALL MPI_TYPE_COMMIT( type_xz(0), ierr )
1064
1065	CALL MPI_TYPE_VECTOR( nbgp, ngp_yz(0), ngp_yz(0), MPI_REAL, type_yz(0), &
1066	ierr )
1067	CALL MPI_TYPE_COMMIT( type_yz(0), ierr )
1068
1069	!
1070	!-- Definition of MPI-datatypes for multigrid method (coarser level grids)
1071	IF ( psolver(1:9) == 'multigrid' ) THEN
1072	!
1073	!-- Definition of MPI-datatyoe as above, but only 1 ghost level is used
1074	DO i = maximum_grid_level, 1 , -1
1075	!
1076	!-- For 3D-exchange
1077	ngp_xz(i) = (nzt_l - nzb_l + 2) * (nxr_l - nxl_l + 3)
1078	ngp_yz(i) = (nzt_l - nzb_l + 2) * (nyn_l - nys_l + 3)
1079
1080	CALL MPI_TYPE_VECTOR( nxr_l-nxl_l+3, nzt_l-nzb_l+2, ngp_yz(i), &
1081	MPI_REAL, type_xz(i), ierr )
1082	CALL MPI_TYPE_COMMIT( type_xz(i), ierr )
1083
1084	CALL MPI_TYPE_VECTOR( 1, ngp_yz(i), ngp_yz(i), MPI_REAL, type_yz(i), &
1085	ierr )
1086	CALL MPI_TYPE_COMMIT( type_yz(i), ierr )
1087
1088
1089	!-- For 2D-exchange of INTEGER arrays on coarser grid level, where 2 ghost
1090	!-- points need to be exchanged.
1091	CALL MPI_TYPE_VECTOR( nxr_l-nxl_l+5, 2, nyn_l-nys_l+5, MPI_INTEGER, &
1092	type_x_int(i), ierr )
1093	CALL MPI_TYPE_COMMIT( type_x_int(i), ierr )
1094
1095
1096	CALL MPI_TYPE_VECTOR( 2, nyn_l-nys_l+5, nyn_l-nys_l+5, MPI_INTEGER, &
1097	type_y_int(i), ierr )
1098	CALL MPI_TYPE_COMMIT( type_y_int(i), ierr )
1099
1100
1101
1102	nxl_l = nxl_l / 2
1103	nxr_l = nxr_l / 2
1104	nys_l = nys_l / 2
1105	nyn_l = nyn_l / 2
1106	nzt_l = nzt_l / 2
1107
1108	ENDDO
1109
1110	ENDIF
1111	!
1112	!-- Define data types for exchange of 3D Integer arrays.
1113	ngp_yz_int = (nzt - nzb + 2) * (nyn - nys + 1 + 2 * nbgp)
1114
1115	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2nbgp, nbgp(nzt-nzb+2), ngp_yz_int, &
1116	MPI_INTEGER, type_xz_int, ierr )
1117	CALL MPI_TYPE_COMMIT( type_xz_int, ierr )
1118
1119	CALL MPI_TYPE_VECTOR( nbgp, ngp_yz_int, ngp_yz_int, MPI_INTEGER, type_yz_int, &
1120	ierr )
1121	CALL MPI_TYPE_COMMIT( type_yz_int, ierr )
1122
1123	#endif
1124
1125	#if defined( __parallel )
1126	!
1127	!-- Setting of flags for inflow/outflow/nesting conditions.
1128	IF ( pleft == MPI_PROC_NULL ) THEN
1129	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1130	inflow_l = .TRUE.
1131	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1132	outflow_l = .TRUE.
1133	ELSEIF ( bc_lr == 'nested' ) THEN
1134	nest_bound_l = .TRUE.
1135	ENDIF
1136	ENDIF
1137
1138	IF ( pright == MPI_PROC_NULL ) THEN
1139	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1140	outflow_r = .TRUE.
1141	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1142	inflow_r = .TRUE.
1143	ELSEIF ( bc_lr == 'nested' ) THEN
1144	nest_bound_r = .TRUE.
1145	ENDIF
1146	ENDIF
1147
1148	IF ( psouth == MPI_PROC_NULL ) THEN
1149	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1150	outflow_s = .TRUE.
1151	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1152	inflow_s = .TRUE.
1153	ELSEIF ( bc_ns == 'nested' ) THEN
1154	nest_bound_s = .TRUE.
1155	ENDIF
1156	ENDIF
1157
1158	IF ( pnorth == MPI_PROC_NULL ) THEN
1159	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1160	inflow_n = .TRUE.
1161	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1162	outflow_n = .TRUE.
1163	ELSEIF ( bc_ns == 'nested' ) THEN
1164	nest_bound_n = .TRUE.
1165	ENDIF
1166	ENDIF
1167
1168
1169	!
1170	!-- Broadcast the id of the inflow PE
1171	IF ( inflow_l ) THEN
1172	id_inflow_l = myidx
1173	ELSE
1174	id_inflow_l = 0
1175	ENDIF
1176	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1177	CALL MPI_ALLREDUCE( id_inflow_l, id_inflow, 1, MPI_INTEGER, MPI_SUM, &
1178	comm1dx, ierr )
1179
1180	!
1181	!-- Broadcast the id of the recycling plane
1182	!-- WARNING: needs to be adjusted in case of inflows other than from left side!
1183	IF ( NINT( recycling_width / dx ) >= nxl .AND. &
1184	NINT( recycling_width / dx ) <= nxr ) THEN
1185	id_recycling_l = myidx
1186	ELSE
1187	id_recycling_l = 0
1188	ENDIF
1189	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1190	CALL MPI_ALLREDUCE( id_recycling_l, id_recycling, 1, MPI_INTEGER, MPI_SUM, &
1191	comm1dx, ierr )
1192
1193	CALL location_message( 'finished', .TRUE. )
1194
1195	#else
1196	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1197	inflow_l = .TRUE.
1198	outflow_r = .TRUE.
1199	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1200	outflow_l = .TRUE.
1201	inflow_r = .TRUE.
1202	ENDIF
1203
1204	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1205	inflow_n = .TRUE.
1206	outflow_s = .TRUE.
1207	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1208	outflow_n = .TRUE.
1209	inflow_s = .TRUE.
1210	ENDIF
1211	#endif
1212
1213	!
1214	!-- At the inflow or outflow, u or v, respectively, have to be calculated for
1215	!-- one more grid point.
1216	IF ( inflow_l .OR. outflow_l .OR. nest_bound_l ) THEN
1217	nxlu = nxl + 1
1218	ELSE
1219	nxlu = nxl
1220	ENDIF
1221	IF ( inflow_s .OR. outflow_s .OR. nest_bound_s ) THEN
1222	nysv = nys + 1
1223	ELSE
1224	nysv = nys
1225	ENDIF
1226
1227	!
1228	!-- Allocate wall flag arrays used in the multigrid solver
1229	IF ( psolver(1:9) == 'multigrid' ) THEN
1230
1231	DO i = maximum_grid_level, 1, -1
1232
1233	SELECT CASE ( i )
1234
1235	CASE ( 1 )
1236	ALLOCATE( wall_flags_1(nzb:nzt_mg(i)+1, &
1237	nys_mg(i)-1:nyn_mg(i)+1, &
1238	nxl_mg(i)-1:nxr_mg(i)+1) )
1239
1240	CASE ( 2 )
1241	ALLOCATE( wall_flags_2(nzb:nzt_mg(i)+1, &
1242	nys_mg(i)-1:nyn_mg(i)+1, &
1243	nxl_mg(i)-1:nxr_mg(i)+1) )
1244
1245	CASE ( 3 )
1246	ALLOCATE( wall_flags_3(nzb:nzt_mg(i)+1, &
1247	nys_mg(i)-1:nyn_mg(i)+1, &
1248	nxl_mg(i)-1:nxr_mg(i)+1) )
1249
1250	CASE ( 4 )
1251	ALLOCATE( wall_flags_4(nzb:nzt_mg(i)+1, &
1252	nys_mg(i)-1:nyn_mg(i)+1, &
1253	nxl_mg(i)-1:nxr_mg(i)+1) )
1254
1255	CASE ( 5 )
1256	ALLOCATE( wall_flags_5(nzb:nzt_mg(i)+1, &
1257	nys_mg(i)-1:nyn_mg(i)+1, &
1258	nxl_mg(i)-1:nxr_mg(i)+1) )
1259
1260	CASE ( 6 )
1261	ALLOCATE( wall_flags_6(nzb:nzt_mg(i)+1, &
1262	nys_mg(i)-1:nyn_mg(i)+1, &
1263	nxl_mg(i)-1:nxr_mg(i)+1) )
1264
1265	CASE ( 7 )
1266	ALLOCATE( wall_flags_7(nzb:nzt_mg(i)+1, &
1267	nys_mg(i)-1:nyn_mg(i)+1, &
1268	nxl_mg(i)-1:nxr_mg(i)+1) )
1269
1270	CASE ( 8 )
1271	ALLOCATE( wall_flags_8(nzb:nzt_mg(i)+1, &
1272	nys_mg(i)-1:nyn_mg(i)+1, &
1273	nxl_mg(i)-1:nxr_mg(i)+1) )
1274
1275	CASE ( 9 )
1276	ALLOCATE( wall_flags_9(nzb:nzt_mg(i)+1, &
1277	nys_mg(i)-1:nyn_mg(i)+1, &
1278	nxl_mg(i)-1:nxr_mg(i)+1) )
1279
1280	CASE ( 10 )
1281	ALLOCATE( wall_flags_10(nzb:nzt_mg(i)+1, &
1282	nys_mg(i)-1:nyn_mg(i)+1, &
1283	nxl_mg(i)-1:nxr_mg(i)+1) )
1284
1285	CASE DEFAULT
1286	message_string = 'more than 10 multigrid levels'
1287	CALL message( 'init_pegrid', 'PA0238', 1, 2, 0, 6, 0 )
1288
1289	END SELECT
1290
1291	ENDDO
1292
1293	ENDIF
1294
1295	!
1296	!-- Calculate the number of groups into which parallel I/O is split.
1297	!-- The default for files which are opened by all PEs (or where each
1298	!-- PE opens his own independent file) is, that all PEs are doing input/output
1299	!-- in parallel at the same time. This might cause performance or even more
1300	!-- severe problems depending on the configuration of the underlying file
1301	!-- system.
1302	!-- First, set the default:
1303	IF ( maximum_parallel_io_streams == -1 .OR. &
1304	maximum_parallel_io_streams > numprocs ) THEN
1305	maximum_parallel_io_streams = numprocs
1306	ENDIF
1307
1308	!
1309	!-- Now calculate the number of io_blocks and the io_group to which the
1310	!-- respective PE belongs. I/O of the groups is done in serial, but in parallel
1311	!-- for all PEs belonging to the same group. A preliminary setting with myid
1312	!-- based on MPI_COMM_WORLD has been done in parin.
1313	io_blocks = numprocs / maximum_parallel_io_streams
1314	io_group = MOD( myid+1, io_blocks )
1315
1316
1317	END SUBROUTINE init_pegrid

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