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source: palm/trunk/SOURCE/init_pegrid.f90 @ 1968

Last change on this file since 1968 was 1968, checked in by suehring, 8 years ago
PE-wise reading of topography file
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File size: 44.9 KB

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

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