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source: palm/trunk/SOURCE/init_pegrid.f90 @ 1323

Last change on this file since 1323 was 1323, checked in by raasch, 10 years ago
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[1]	1	SUBROUTINE init_pegrid
[1036]	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	!
[1310]	17	! Copyright 1997-2014 Leibniz Universitaet Hannover
[1036]	18	!--------------------------------------------------------------------------------!
	19	!
[254]	20	! Current revisions:
[1322]	21	! ------------------
[1321]	22	!
[1323]	23	!
[1321]	24	! Former revisions:
	25	! -----------------
	26	! $Id: init_pegrid.f90 1323 2014-03-20 17:09:54Z raasch $
	27	!
[1323]	28	! 1322 2014-03-20 16:38:49Z raasch
	29	! REAL functions provided with KIND-attribute
	30	!
[1321]	31	! 1320 2014-03-20 08:40:49Z raasch
[1320]	32	! ONLY-attribute added to USE-statements,
	33	! kind-parameters added to all INTEGER and REAL declaration statements,
	34	! kinds are defined in new module kinds,
	35	! revision history before 2012 removed,
	36	! comment fields (!:) to be used for variable explanations added to
	37	! all variable declaration statements
[760]	38	!
[1305]	39	! 1304 2014-03-12 10:29:42Z raasch
	40	! bugfix: single core MPI runs missed some settings of transpose indices
	41	!
[1213]	42	! 1212 2013-08-15 08:46:27Z raasch
	43	! error message for poisfft_hybrid removed
	44	!
[1160]	45	! 1159 2013-05-21 11:58:22Z fricke
	46	! dirichlet/neumann and neumann/dirichlet removed
	47	!
[1140]	48	! 1139 2013-04-18 07:25:03Z raasch
	49	! bugfix for calculating the id of the PE carrying the recycling plane
	50	!
[1112]	51	! 1111 2013-03-08 23:54:10Z raasch
	52	! initialization of poisfft moved to module poisfft
	53	!
[1093]	54	! 1092 2013-02-02 11:24:22Z raasch
	55	! unused variables removed
	56	!
[1057]	57	! 1056 2012-11-16 15:28:04Z raasch
	58	! Indices for arrays n.._mg start from zero due to definition of arrays f2 and
	59	! p2 as automatic arrays in recursive subroutine next_mg_level
	60	!
[1042]	61	! 1041 2012-11-06 02:36:29Z raasch
	62	! a 2d virtual processor topology is used by default for all machines
	63	!
[1037]	64	! 1036 2012-10-22 13:43:42Z raasch
	65	! code put under GPL (PALM 3.9)
	66	!
[1004]	67	! 1003 2012-09-14 14:35:53Z raasch
	68	! subdomains must have identical size (grid matching = "match" removed)
	69	!
[1002]	70	! 1001 2012-09-13 14:08:46Z raasch
	71	! all actions concerning upstream-spline-method removed
	72	!
[979]	73	! 978 2012-08-09 08:28:32Z fricke
	74	! dirichlet/neumann and neumann/dirichlet added
	75	! nxlu and nysv are also calculated for inflow boundary
	76	!
[810]	77	! 809 2012-01-30 13:32:58Z maronga
	78	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
	79	!
[808]	80	! 807 2012-01-25 11:53:51Z maronga
	81	! New cpp directive "__check" implemented which is used by check_namelist_files
	82	!
[1]	83	! Revision 1.1 1997/07/24 11:15:09 raasch
	84	! Initial revision
	85	!
	86	!
	87	! Description:
	88	! ------------
	89	! Determination of the virtual processor topology (if not prescribed by the
	90	! user)and computation of the grid point number and array bounds of the local
	91	! domains.
	92	!------------------------------------------------------------------------------!
	93
[1320]	94	USE control_parameters, &
	95	ONLY: bc_lr, bc_ns, coupling_mode, coupling_topology, dt_dosp, &
	96	gathered_size, grid_level, grid_level_count, host, inflow_l, &
	97	inflow_n, inflow_r, inflow_s, io_blocks, io_group, &
	98	maximum_grid_level, maximum_parallel_io_streams, message_string,&
	99	mg_switch_to_pe0_level, momentum_advec, psolver, outflow_l, &
	100	outflow_n, outflow_r, outflow_s, recycling_width, scalar_advec, &
	101	subdomain_size
[1]	102
[1320]	103	USE grid_variables, &
	104	ONLY: dx
	105
	106	USE indices, &
	107	ONLY: mg_loc_ind, nbgp, nnx, nny, nnz, nx, nx_a, nx_o, nxl, nxl_mg, &
	108	nxlu, nxr, nxr_mg, ny, ny_a, ny_o, nyn, nyn_mg, nys, nys_mg, &
	109	nysv, nz, nzb, nzt, nzt_mg, wall_flags_1, wall_flags_2, &
	110	wall_flags_3, wall_flags_4, wall_flags_5, wall_flags_6, &
	111	wall_flags_7, wall_flags_8, wall_flags_9, wall_flags_10
[1]	112
[1320]	113	USE kinds
	114
	115	USE pegrid
	116
	117	USE transpose_indices, &
	118	ONLY: nxl_y, nxl_yd, nxl_z, nxr_y, nxr_yd, nxr_z, nyn_x, nyn_z, nys_x,&
	119	nys_z, nzb_x, nzb_y, nzb_yd, nzt_x, nzt_yd, nzt_y
[667]	120
[1]	121	IMPLICIT NONE
	122
[1320]	123	INTEGER(iwp) :: i !:
	124	INTEGER(iwp) :: id_inflow_l !:
	125	INTEGER(iwp) :: id_recycling_l !:
	126	INTEGER(iwp) :: ind(5) !:
	127	INTEGER(iwp) :: j !:
	128	INTEGER(iwp) :: k !:
	129	INTEGER(iwp) :: maximum_grid_level_l !:
	130	INTEGER(iwp) :: mg_levels_x !:
	131	INTEGER(iwp) :: mg_levels_y !:
	132	INTEGER(iwp) :: mg_levels_z !:
	133	INTEGER(iwp) :: mg_switch_to_pe0_level_l !:
	134	INTEGER(iwp) :: nnx_y !:
	135	INTEGER(iwp) :: nnx_z !:
	136	INTEGER(iwp) :: nny_x !:
	137	INTEGER(iwp) :: nny_z !:
	138	INTEGER(iwp) :: nnz_x !:
	139	INTEGER(iwp) :: nnz_y !:
	140	INTEGER(iwp) :: numproc_sqr !:
	141	INTEGER(iwp) :: nxl_l !:
	142	INTEGER(iwp) :: nxr_l !:
	143	INTEGER(iwp) :: nyn_l !:
	144	INTEGER(iwp) :: nys_l !:
	145	INTEGER(iwp) :: nzb_l !:
	146	INTEGER(iwp) :: nzt_l !:
	147	INTEGER(iwp) :: omp_get_num_threads !:
[1]	148
[1320]	149	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: ind_all !:
	150	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxlf !:
	151	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxrf !:
	152	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nynf !:
	153	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nysf !:
[1]	154
[1320]	155	INTEGER(iwp), DIMENSION(2) :: pdims_remote !:
[667]	156
[1092]	157	#if defined( __mpi2 )
[1320]	158	LOGICAL :: found !:
[1092]	159	#endif
[1]	160
	161	!
	162	!-- Get the number of OpenMP threads
	163	!$OMP PARALLEL
[82]	164	#if defined( __intel_openmp_bug )
[1]	165	threads_per_task = omp_get_num_threads()
	166	#else
	167	!$ threads_per_task = omp_get_num_threads()
	168	#endif
	169	!$OMP END PARALLEL
	170
	171
	172	#if defined( __parallel )
[667]	173
[1]	174	!
	175	!-- Determine the processor topology or check it, if prescribed by the user
	176	IF ( npex == -1 .AND. npey == -1 ) THEN
	177
	178	!
	179	!-- Automatic determination of the topology
[1322]	180	numproc_sqr = SQRT( REAL( numprocs, KIND=wp ) )
[1041]	181	pdims(1) = MAX( numproc_sqr , 1 )
	182	DO WHILE ( MOD( numprocs , pdims(1) ) /= 0 )
	183	pdims(1) = pdims(1) - 1
	184	ENDDO
	185	pdims(2) = numprocs / pdims(1)
[1]	186
	187	ELSEIF ( npex /= -1 .AND. npey /= -1 ) THEN
	188
	189	!
	190	!-- Prescribed by user. Number of processors on the prescribed topology
	191	!-- must be equal to the number of PEs available to the job
	192	IF ( ( npex * npey ) /= numprocs ) THEN
[274]	193	WRITE( message_string, * ) 'number of PEs of the prescribed ', &
	194	'topology (', npex*npey,') does not match & the number of ', &
	195	'PEs available to the job (', numprocs, ')'
[254]	196	CALL message( 'init_pegrid', 'PA0221', 1, 2, 0, 6, 0 )
[1]	197	ENDIF
	198	pdims(1) = npex
	199	pdims(2) = npey
	200
	201	ELSE
	202	!
	203	!-- If the processor topology is prescribed by the user, the number of
	204	!-- PEs must be given in both directions
[274]	205	message_string = 'if the processor topology is prescribed by the, ' // &
	206	' user& both values of "npex" and "npey" must be given ' // &
	207	'in the &NAMELIST-parameter file'
[254]	208	CALL message( 'init_pegrid', 'PA0222', 1, 2, 0, 6, 0 )
[1]	209
	210	ENDIF
	211
	212	!
[622]	213	!-- For communication speedup, set barriers in front of collective
	214	!-- communications by default on SGI-type systems
	215	IF ( host(3:5) == 'sgi' ) collective_wait = .TRUE.
	216
	217	!
[1]	218	!-- If necessary, set horizontal boundary conditions to non-cyclic
[722]	219	IF ( bc_lr /= 'cyclic' ) cyclic(1) = .FALSE.
	220	IF ( bc_ns /= 'cyclic' ) cyclic(2) = .FALSE.
[1]	221
[807]	222
[809]	223	#if ! defined( __check)
[1]	224	!
	225	!-- Create the virtual processor grid
	226	CALL MPI_CART_CREATE( comm_palm, ndim, pdims, cyclic, reorder, &
	227	comm2d, ierr )
	228	CALL MPI_COMM_RANK( comm2d, myid, ierr )
	229	WRITE (myid_char,'(''_'',I4.4)') myid
	230
	231	CALL MPI_CART_COORDS( comm2d, myid, ndim, pcoord, ierr )
	232	CALL MPI_CART_SHIFT( comm2d, 0, 1, pleft, pright, ierr )
	233	CALL MPI_CART_SHIFT( comm2d, 1, 1, psouth, pnorth, ierr )
	234
	235	!
	236	!-- Determine sub-topologies for transpositions
	237	!-- Transposition from z to x:
	238	remain_dims(1) = .TRUE.
	239	remain_dims(2) = .FALSE.
	240	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dx, ierr )
	241	CALL MPI_COMM_RANK( comm1dx, myidx, ierr )
	242	!
	243	!-- Transposition from x to y
	244	remain_dims(1) = .FALSE.
	245	remain_dims(2) = .TRUE.
	246	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dy, ierr )
	247	CALL MPI_COMM_RANK( comm1dy, myidy, ierr )
	248
[807]	249	#endif
[1]	250
	251	!
[1003]	252	!-- Calculate array bounds along x-direction for every PE.
[1]	253	ALLOCATE( nxlf(0:pdims(1)-1), nxrf(0:pdims(1)-1), nynf(0:pdims(2)-1), &
[1003]	254	nysf(0:pdims(2)-1) )
[1]	255
[1003]	256	IF ( MOD( nx+1 , pdims(1) ) /= 0 ) THEN
[274]	257	WRITE( message_string, * ) 'x-direction: gridpoint number (',nx+1,') ',&
	258	'is not an& integral divisor of the number ', &
	259	'processors (', pdims(1),')'
[254]	260	CALL message( 'init_pegrid', 'PA0225', 1, 2, 0, 6, 0 )
[1]	261	ELSE
[1003]	262	nnx = ( nx + 1 ) / pdims(1)
[1]	263	IF ( nnx*pdims(1) - ( nx + 1) > nnx ) THEN
[274]	264	WRITE( message_string, * ) 'x-direction: nx does not match the', &
	265	'requirements given by the number of PEs &used', &
	266	'& please use nx = ', nx - ( pdims(1) - ( nnx*pdims(1) &
	267	- ( nx + 1 ) ) ), ' instead of nx =', nx
[254]	268	CALL message( 'init_pegrid', 'PA0226', 1, 2, 0, 6, 0 )
[1]	269	ENDIF
	270	ENDIF
	271
	272	!
	273	!-- Left and right array bounds, number of gridpoints
	274	DO i = 0, pdims(1)-1
	275	nxlf(i) = i * nnx
	276	nxrf(i) = ( i + 1 ) * nnx - 1
	277	ENDDO
	278
	279	!
	280	!-- Calculate array bounds in y-direction for every PE.
[1003]	281	IF ( MOD( ny+1 , pdims(2) ) /= 0 ) THEN
[274]	282	WRITE( message_string, * ) 'y-direction: gridpoint number (',ny+1,') ', &
	283	'is not an& integral divisor of the number of', &
	284	'processors (', pdims(2),')'
[254]	285	CALL message( 'init_pegrid', 'PA0227', 1, 2, 0, 6, 0 )
[1]	286	ELSE
[1003]	287	nny = ( ny + 1 ) / pdims(2)
[1]	288	IF ( nny*pdims(2) - ( ny + 1) > nny ) THEN
[274]	289	WRITE( message_string, * ) 'y-direction: ny does not match the', &
	290	'requirements given by the number of PEs &used ', &
	291	'& please use ny = ', ny - ( pdims(2) - ( nnx*pdims(2) &
[254]	292	- ( ny + 1 ) ) ), ' instead of ny =', ny
	293	CALL message( 'init_pegrid', 'PA0228', 1, 2, 0, 6, 0 )
[1]	294	ENDIF
	295	ENDIF
	296
	297	!
	298	!-- South and north array bounds
	299	DO j = 0, pdims(2)-1
	300	nysf(j) = j * nny
	301	nynf(j) = ( j + 1 ) * nny - 1
	302	ENDDO
	303
	304	!
	305	!-- Local array bounds of the respective PEs
[1003]	306	nxl = nxlf(pcoord(1))
	307	nxr = nxrf(pcoord(1))
	308	nys = nysf(pcoord(2))
	309	nyn = nynf(pcoord(2))
	310	nzb = 0
	311	nzt = nz
	312	nnz = nz
[1]	313
	314	!
[707]	315	!-- Set switches to define if the PE is situated at the border of the virtual
	316	!-- processor grid
	317	IF ( nxl == 0 ) left_border_pe = .TRUE.
	318	IF ( nxr == nx ) right_border_pe = .TRUE.
	319	IF ( nys == 0 ) south_border_pe = .TRUE.
	320	IF ( nyn == ny ) north_border_pe = .TRUE.
	321
	322	!
[1]	323	!-- Calculate array bounds and gridpoint numbers for the transposed arrays
	324	!-- (needed in the pressure solver)
	325	!-- For the transposed arrays, cyclic boundaries as well as top and bottom
	326	!-- boundaries are omitted, because they are obstructive to the transposition
	327
	328	!
	329	!-- 1. transposition z --> x
[1001]	330	!-- This transposition is not neccessary in case of a 1d-decomposition along x
[1304]	331	nys_x = nys
	332	nyn_x = nyn
	333	nny_x = nny
	334	nnz_x = nz / pdims(1)
	335	nzb_x = 1 + myidx * nnz_x
	336	nzt_x = ( myidx + 1 ) * nnz_x
	337	sendrecvcount_zx = nnx * nny * nnz_x
	338
[1001]	339	IF ( pdims(2) /= 1 ) THEN
[1003]	340	IF ( MOD( nz , pdims(1) ) /= 0 ) THEN
[274]	341	WRITE( message_string, * ) 'transposition z --> x:', &
	342	'&nz=',nz,' is not an integral divisior of pdims(1)=', &
	343	pdims(1)
[254]	344	CALL message( 'init_pegrid', 'PA0230', 1, 2, 0, 6, 0 )
[1]	345	ENDIF
	346	ENDIF
	347
	348	!
	349	!-- 2. transposition x --> y
[1003]	350	nnz_y = nnz_x
	351	nzb_y = nzb_x
	352	nzt_y = nzt_x
	353	IF ( MOD( nx+1 , pdims(2) ) /= 0 ) THEN
[274]	354	WRITE( message_string, * ) 'transposition x --> y:', &
	355	'&nx+1=',nx+1,' is not an integral divisor of ',&
	356	'pdims(2)=',pdims(2)
[254]	357	CALL message( 'init_pegrid', 'PA0231', 1, 2, 0, 6, 0 )
[1]	358	ENDIF
[1003]	359	nnx_y = (nx+1) / pdims(2)
[1]	360	nxl_y = myidy * nnx_y
[1003]	361	nxr_y = ( myidy + 1 ) * nnx_y - 1
[1]	362	sendrecvcount_xy = nnx_y * nny_x * nnz_y
	363
	364	!
	365	!-- 3. transposition y --> z (ELSE: x --> y in case of 1D-decomposition
	366	!-- along x)
[1304]	367	nnx_z = nnx_y
	368	nxl_z = nxl_y
	369	nxr_z = nxr_y
	370	nny_z = (ny+1) / pdims(1)
	371	nys_z = myidx * nny_z
	372	nyn_z = ( myidx + 1 ) * nny_z - 1
	373	sendrecvcount_yz = nnx_y * nny_z * nnz_y
	374
[1001]	375	IF ( pdims(2) /= 1 ) THEN
[1]	376	!
	377	!-- y --> z
	378	!-- This transposition is not neccessary in case of a 1d-decomposition
	379	!-- along x, except that the uptream-spline method is switched on
[1003]	380	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
[274]	381	WRITE( message_string, * ) 'transposition y --> z:', &
	382	'& ny+1=',ny+1,' is not an integral divisor of ',&
	383	'pdims(1)=',pdims(1)
[254]	384	CALL message( 'init_pegrid', 'PA0232', 1, 2, 0, 6, 0 )
[1]	385	ENDIF
	386
	387	ELSE
	388	!
	389	!-- x --> y. This condition must be fulfilled for a 1D-decomposition along x
[1003]	390	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
[274]	391	WRITE( message_string, * ) 'transposition x --> y:', &
	392	'& ny+1=',ny+1,' is not an integral divisor of ',&
	393	'pdims(1)=',pdims(1)
[254]	394	CALL message( 'init_pegrid', 'PA0233', 1, 2, 0, 6, 0 )
[1]	395	ENDIF
	396
	397	ENDIF
	398
	399	!
	400	!-- Indices for direct transpositions z --> y (used for calculating spectra)
	401	IF ( dt_dosp /= 9999999.9 ) THEN
[1003]	402	IF ( MOD( nz, pdims(2) ) /= 0 ) THEN
[274]	403	WRITE( message_string, * ) 'direct transposition z --> y (needed ', &
	404	'for spectra):& nz=',nz,' is not an integral divisor of ',&
	405	'pdims(2)=',pdims(2)
[254]	406	CALL message( 'init_pegrid', 'PA0234', 1, 2, 0, 6, 0 )
[1]	407	ELSE
[1003]	408	nxl_yd = nxl
	409	nxr_yd = nxr
	410	nzb_yd = 1 + myidy * ( nz / pdims(2) )
	411	nzt_yd = ( myidy + 1 ) * ( nz / pdims(2) )
	412	sendrecvcount_zyd = nnx * nny * ( nz / pdims(2) )
[1]	413	ENDIF
	414	ENDIF
	415
	416	!
	417	!-- Indices for direct transpositions y --> x (they are only possible in case
	418	!-- of a 1d-decomposition along x)
	419	IF ( pdims(2) == 1 ) THEN
[1003]	420	nny_x = nny / pdims(1)
	421	nys_x = myid * nny_x
	422	nyn_x = ( myid + 1 ) * nny_x - 1
	423	nzb_x = 1
	424	nzt_x = nz
	425	sendrecvcount_xy = nnx * nny_x * nz
[1]	426	ENDIF
	427
	428	!
	429	!-- Indices for direct transpositions x --> y (they are only possible in case
	430	!-- of a 1d-decomposition along y)
	431	IF ( pdims(1) == 1 ) THEN
[1003]	432	nnx_y = nnx / pdims(2)
	433	nxl_y = myid * nnx_y
	434	nxr_y = ( myid + 1 ) * nnx_y - 1
	435	nzb_y = 1
	436	nzt_y = nz
	437	sendrecvcount_xy = nnx_y * nny * nz
[1]	438	ENDIF
	439
	440	!
	441	!-- Arrays for storing the array bounds are needed any more
	442	DEALLOCATE( nxlf , nxrf , nynf , nysf )
	443
[807]	444
[809]	445	#if ! defined( __check)
[145]	446	!
	447	!-- Collect index bounds from other PEs (to be written to restart file later)
	448	ALLOCATE( hor_index_bounds(4,0:numprocs-1) )
	449
	450	IF ( myid == 0 ) THEN
	451
	452	hor_index_bounds(1,0) = nxl
	453	hor_index_bounds(2,0) = nxr
	454	hor_index_bounds(3,0) = nys
	455	hor_index_bounds(4,0) = nyn
	456
	457	!
	458	!-- Receive data from all other PEs
	459	DO i = 1, numprocs-1
	460	CALL MPI_RECV( ibuf, 4, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
	461	ierr )
	462	hor_index_bounds(:,i) = ibuf(1:4)
	463	ENDDO
	464
	465	ELSE
	466	!
	467	!-- Send index bounds to PE0
	468	ibuf(1) = nxl
	469	ibuf(2) = nxr
	470	ibuf(3) = nys
	471	ibuf(4) = nyn
	472	CALL MPI_SEND( ibuf, 4, MPI_INTEGER, 0, myid, comm2d, ierr )
	473
	474	ENDIF
	475
[807]	476	#endif
	477
[1]	478	#if defined( __print )
	479	!
	480	!-- Control output
	481	IF ( myid == 0 ) THEN
	482	PRINT, ' processor topology *'
	483	PRINT*, ' '
	484	PRINT*, 'myid pcoord left right south north idx idy nxl: nxr',&
	485	&' nys: nyn'
	486	PRINT*, '------------------------------------------------------------',&
	487	&'-----------'
	488	WRITE (*,1000) 0, pcoord(1), pcoord(2), pleft, pright, psouth, pnorth, &
	489	myidx, myidy, nxl, nxr, nys, nyn
	490	1000 FORMAT (I4,2X,'(',I3,',',I3,')',3X,I4,2X,I4,3X,I4,2X,I4,2X,I3,1X,I3, &
	491	2(2X,I4,':',I4))
	492
	493	!
[108]	494	!-- Receive data from the other PEs
[1]	495	DO i = 1,numprocs-1
	496	CALL MPI_RECV( ibuf, 12, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
	497	ierr )
	498	WRITE (*,1000) i, ( ibuf(j) , j = 1,12 )
	499	ENDDO
	500	ELSE
	501
	502	!
	503	!-- Send data to PE0
	504	ibuf(1) = pcoord(1); ibuf(2) = pcoord(2); ibuf(3) = pleft
	505	ibuf(4) = pright; ibuf(5) = psouth; ibuf(6) = pnorth; ibuf(7) = myidx
	506	ibuf(8) = myidy; ibuf(9) = nxl; ibuf(10) = nxr; ibuf(11) = nys
	507	ibuf(12) = nyn
	508	CALL MPI_SEND( ibuf, 12, MPI_INTEGER, 0, myid, comm2d, ierr )
	509	ENDIF
	510	#endif
	511
[809]	512	#if defined( __parallel ) && ! defined( __check)
[102]	513	#if defined( __mpi2 )
	514	!
	515	!-- In case of coupled runs, get the port name on PE0 of the atmosphere model
	516	!-- and pass it to PE0 of the ocean model
	517	IF ( myid == 0 ) THEN
	518
	519	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
	520
	521	CALL MPI_OPEN_PORT( MPI_INFO_NULL, port_name, ierr )
[108]	522
[102]	523	CALL MPI_PUBLISH_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, &
	524	ierr )
[108]	525
	526	!
[104]	527	!-- Write a flag file for the ocean model and the other atmosphere
	528	!-- processes.
	529	!-- There seems to be a bug in MPICH2 which causes hanging processes
	530	!-- in case that execution of LOOKUP_NAME is continued too early
	531	!-- (i.e. before the port has been created)
	532	OPEN( 90, FILE='COUPLING_PORT_OPENED', FORM='FORMATTED' )
	533	WRITE ( 90, '(''TRUE'')' )
	534	CLOSE ( 90 )
[102]	535
	536	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
	537
[104]	538	!
	539	!-- Continue only if the atmosphere model has created the port.
	540	!-- There seems to be a bug in MPICH2 which causes hanging processes
	541	!-- in case that execution of LOOKUP_NAME is continued too early
	542	!-- (i.e. before the port has been created)
	543	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
	544	DO WHILE ( .NOT. found )
	545	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
	546	ENDDO
	547
[102]	548	CALL MPI_LOOKUP_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, ierr )
	549
	550	ENDIF
	551
	552	ENDIF
	553
	554	!
	555	!-- In case of coupled runs, establish the connection between the atmosphere
	556	!-- and the ocean model and define the intercommunicator (comm_inter)
	557	CALL MPI_BARRIER( comm2d, ierr )
	558	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
	559
	560	CALL MPI_COMM_ACCEPT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
	561	comm_inter, ierr )
[108]	562	coupling_mode_remote = 'ocean_to_atmosphere'
	563
[102]	564	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
	565
	566	CALL MPI_COMM_CONNECT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
	567	comm_inter, ierr )
[108]	568	coupling_mode_remote = 'atmosphere_to_ocean'
	569
[102]	570	ENDIF
[206]	571	#endif
[102]	572
[667]	573	!
[709]	574	!-- Determine the number of ghost point layers
	575	IF ( scalar_advec == 'ws-scheme' .OR. momentum_advec == 'ws-scheme' ) THEN
[667]	576	nbgp = 3
	577	ELSE
	578	nbgp = 1
[709]	579	ENDIF
[667]	580
[102]	581	!
[709]	582	!-- Create a new MPI derived datatype for the exchange of surface (xy) data,
	583	!-- which is needed for coupled atmosphere-ocean runs.
	584	!-- First, calculate number of grid points of an xy-plane.
[667]	585	ngp_xy = ( nxr - nxl + 1 + 2 * nbgp ) * ( nyn - nys + 1 + 2 * nbgp )
[102]	586	CALL MPI_TYPE_VECTOR( ngp_xy, 1, nzt-nzb+2, MPI_REAL, type_xy, ierr )
	587	CALL MPI_TYPE_COMMIT( type_xy, ierr )
[667]	588
[709]	589	IF ( TRIM( coupling_mode ) /= 'uncoupled' ) THEN
[667]	590
	591	!
	592	!-- Pass the number of grid points of the atmosphere model to
	593	!-- the ocean model and vice versa
	594	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
	595
	596	nx_a = nx
	597	ny_a = ny
	598
[709]	599	IF ( myid == 0 ) THEN
	600
	601	CALL MPI_SEND( nx_a, 1, MPI_INTEGER, numprocs, 1, comm_inter, &
	602	ierr )
	603	CALL MPI_SEND( ny_a, 1, MPI_INTEGER, numprocs, 2, comm_inter, &
	604	ierr )
	605	CALL MPI_SEND( pdims, 2, MPI_INTEGER, numprocs, 3, comm_inter, &
	606	ierr )
	607	CALL MPI_RECV( nx_o, 1, MPI_INTEGER, numprocs, 4, comm_inter, &
	608	status, ierr )
	609	CALL MPI_RECV( ny_o, 1, MPI_INTEGER, numprocs, 5, comm_inter, &
	610	status, ierr )
	611	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, numprocs, 6, &
[667]	612	comm_inter, status, ierr )
	613	ENDIF
	614
[709]	615	CALL MPI_BCAST( nx_o, 1, MPI_INTEGER, 0, comm2d, ierr )
	616	CALL MPI_BCAST( ny_o, 1, MPI_INTEGER, 0, comm2d, ierr )
	617	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr )
[667]	618
	619	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
	620
	621	nx_o = nx
	622	ny_o = ny
	623
	624	IF ( myid == 0 ) THEN
[709]	625
	626	CALL MPI_RECV( nx_a, 1, MPI_INTEGER, 0, 1, comm_inter, status, &
	627	ierr )
	628	CALL MPI_RECV( ny_a, 1, MPI_INTEGER, 0, 2, comm_inter, status, &
	629	ierr )
	630	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, 0, 3, comm_inter, &
	631	status, ierr )
	632	CALL MPI_SEND( nx_o, 1, MPI_INTEGER, 0, 4, comm_inter, ierr )
	633	CALL MPI_SEND( ny_o, 1, MPI_INTEGER, 0, 5, comm_inter, ierr )
	634	CALL MPI_SEND( pdims, 2, MPI_INTEGER, 0, 6, comm_inter, ierr )
[667]	635	ENDIF
	636
	637	CALL MPI_BCAST( nx_a, 1, MPI_INTEGER, 0, comm2d, ierr)
	638	CALL MPI_BCAST( ny_a, 1, MPI_INTEGER, 0, comm2d, ierr)
	639	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr)
	640
	641	ENDIF
	642
[709]	643	ngp_a = ( nx_a+1 + 2 * nbgp ) * ( ny_a+1 + 2 * nbgp )
	644	ngp_o = ( nx_o+1 + 2 * nbgp ) * ( ny_o+1 + 2 * nbgp )
[667]	645
	646	!
[709]	647	!-- Determine if the horizontal grid and the number of PEs in ocean and
	648	!-- atmosphere is same or not
	649	IF ( nx_o == nx_a .AND. ny_o == ny_a .AND. &
[667]	650	pdims(1) == pdims_remote(1) .AND. pdims(2) == pdims_remote(2) ) &
	651	THEN
	652	coupling_topology = 0
	653	ELSE
	654	coupling_topology = 1
	655	ENDIF
	656
	657	!
	658	!-- Determine the target PEs for the exchange between ocean and
	659	!-- atmosphere (comm2d)
[709]	660	IF ( coupling_topology == 0 ) THEN
	661	!
	662	!-- In case of identical topologies, every atmosphere PE has exactly one
	663	!-- ocean PE counterpart and vice versa
	664	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
[667]	665	target_id = myid + numprocs
	666	ELSE
	667	target_id = myid
	668	ENDIF
	669
	670	ELSE
	671	!
	672	!-- In case of nonequivalent topology in ocean and atmosphere only for
	673	!-- PE0 in ocean and PE0 in atmosphere a target_id is needed, since
[709]	674	!-- data echxchange between ocean and atmosphere will be done only
	675	!-- between these PEs.
	676	IF ( myid == 0 ) THEN
	677
	678	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
[667]	679	target_id = numprocs
	680	ELSE
	681	target_id = 0
	682	ENDIF
[709]	683
[667]	684	ENDIF
[709]	685
[667]	686	ENDIF
	687
	688	ENDIF
	689
	690
[102]	691	#endif
	692
[1]	693	#else
	694
	695	!
	696	!-- Array bounds when running on a single PE (respectively a non-parallel
	697	!-- machine)
[1003]	698	nxl = 0
	699	nxr = nx
	700	nnx = nxr - nxl + 1
	701	nys = 0
	702	nyn = ny
	703	nny = nyn - nys + 1
	704	nzb = 0
	705	nzt = nz
	706	nnz = nz
[1]	707
[145]	708	ALLOCATE( hor_index_bounds(4,0:0) )
	709	hor_index_bounds(1,0) = nxl
	710	hor_index_bounds(2,0) = nxr
	711	hor_index_bounds(3,0) = nys
	712	hor_index_bounds(4,0) = nyn
	713
[1]	714	!
	715	!-- Array bounds for the pressure solver (in the parallel code, these bounds
	716	!-- are the ones for the transposed arrays)
[1003]	717	nys_x = nys
	718	nyn_x = nyn
	719	nzb_x = nzb + 1
	720	nzt_x = nzt
[1]	721
[1003]	722	nxl_y = nxl
	723	nxr_y = nxr
	724	nzb_y = nzb + 1
	725	nzt_y = nzt
[1]	726
[1003]	727	nxl_z = nxl
	728	nxr_z = nxr
	729	nys_z = nys
	730	nyn_z = nyn
[1]	731
	732	#endif
	733
	734	!
	735	!-- Calculate number of grid levels necessary for the multigrid poisson solver
	736	!-- as well as the gridpoint indices on each level
	737	IF ( psolver == 'multigrid' ) THEN
	738
	739	!
	740	!-- First calculate number of possible grid levels for the subdomains
	741	mg_levels_x = 1
	742	mg_levels_y = 1
	743	mg_levels_z = 1
	744
	745	i = nnx
	746	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
	747	i = i / 2
	748	mg_levels_x = mg_levels_x + 1
	749	ENDDO
	750
	751	j = nny
	752	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
	753	j = j / 2
	754	mg_levels_y = mg_levels_y + 1
	755	ENDDO
	756
[181]	757	k = nz ! do not use nnz because it might be > nz due to transposition
	758	! requirements
[1]	759	DO WHILE ( MOD( k, 2 ) == 0 .AND. k /= 2 )
	760	k = k / 2
	761	mg_levels_z = mg_levels_z + 1
	762	ENDDO
	763
	764	maximum_grid_level = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
	765
	766	!
	767	!-- Find out, if the total domain allows more levels. These additional
[709]	768	!-- levels are identically processed on all PEs.
[197]	769	IF ( numprocs > 1 .AND. mg_switch_to_pe0_level /= -1 ) THEN
[709]	770
[1]	771	IF ( mg_levels_z > MIN( mg_levels_x, mg_levels_y ) ) THEN
[709]	772
[1]	773	mg_switch_to_pe0_level_l = maximum_grid_level
	774
	775	mg_levels_x = 1
	776	mg_levels_y = 1
	777
	778	i = nx+1
	779	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
	780	i = i / 2
	781	mg_levels_x = mg_levels_x + 1
	782	ENDDO
	783
	784	j = ny+1
	785	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
	786	j = j / 2
	787	mg_levels_y = mg_levels_y + 1
	788	ENDDO
	789
	790	maximum_grid_level_l = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
	791
	792	IF ( maximum_grid_level_l > mg_switch_to_pe0_level_l ) THEN
	793	mg_switch_to_pe0_level_l = maximum_grid_level_l - &
	794	mg_switch_to_pe0_level_l + 1
	795	ELSE
	796	mg_switch_to_pe0_level_l = 0
	797	ENDIF
[709]	798
[1]	799	ELSE
	800	mg_switch_to_pe0_level_l = 0
	801	maximum_grid_level_l = maximum_grid_level
[709]	802
[1]	803	ENDIF
	804
	805	!
	806	!-- Use switch level calculated above only if it is not pre-defined
	807	!-- by user
	808	IF ( mg_switch_to_pe0_level == 0 ) THEN
	809	IF ( mg_switch_to_pe0_level_l /= 0 ) THEN
	810	mg_switch_to_pe0_level = mg_switch_to_pe0_level_l
	811	maximum_grid_level = maximum_grid_level_l
	812	ENDIF
	813
	814	ELSE
	815	!
	816	!-- Check pre-defined value and reset to default, if neccessary
	817	IF ( mg_switch_to_pe0_level < mg_switch_to_pe0_level_l .OR. &
	818	mg_switch_to_pe0_level >= maximum_grid_level_l ) THEN
[254]	819	message_string = 'mg_switch_to_pe0_level ' // &
	820	'out of range and reset to default (=0)'
	821	CALL message( 'init_pegrid', 'PA0235', 0, 1, 0, 6, 0 )
[1]	822	mg_switch_to_pe0_level = 0
	823	ELSE
	824	!
	825	!-- Use the largest number of possible levels anyway and recalculate
	826	!-- the switch level to this largest number of possible values
	827	maximum_grid_level = maximum_grid_level_l
	828
	829	ENDIF
[709]	830
[1]	831	ENDIF
	832
	833	ENDIF
	834
[1056]	835	ALLOCATE( grid_level_count(maximum_grid_level), &
	836	nxl_mg(0:maximum_grid_level), nxr_mg(0:maximum_grid_level), &
	837	nyn_mg(0:maximum_grid_level), nys_mg(0:maximum_grid_level), &
	838	nzt_mg(0:maximum_grid_level) )
[1]	839
	840	grid_level_count = 0
[1056]	841	!
	842	!-- Index zero required as dummy due to definition of arrays f2 and p2 in
	843	!-- recursive subroutine next_mg_level
	844	nxl_mg(0) = 0; nxr_mg(0) = 0; nyn_mg(0) = 0; nys_mg(0) = 0; nzt_mg(0) = 0
[778]	845
[1]	846	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzt_l = nzt
	847
	848	DO i = maximum_grid_level, 1 , -1
	849
	850	IF ( i == mg_switch_to_pe0_level ) THEN
[809]	851	#if defined( __parallel ) && ! defined( __check )
[1]	852	!
	853	!-- Save the grid size of the subdomain at the switch level, because
	854	!-- it is needed in poismg.
	855	ind(1) = nxl_l; ind(2) = nxr_l
	856	ind(3) = nys_l; ind(4) = nyn_l
	857	ind(5) = nzt_l
	858	ALLOCATE( ind_all(5*numprocs), mg_loc_ind(5,0:numprocs-1) )
	859	CALL MPI_ALLGATHER( ind, 5, MPI_INTEGER, ind_all, 5, &
	860	MPI_INTEGER, comm2d, ierr )
	861	DO j = 0, numprocs-1
	862	DO k = 1, 5
	863	mg_loc_ind(k,j) = ind_all(k+j*5)
	864	ENDDO
	865	ENDDO
	866	DEALLOCATE( ind_all )
	867	!
[709]	868	!-- Calculate the grid size of the total domain
[1]	869	nxr_l = ( nxr_l-nxl_l+1 ) * pdims(1) - 1
	870	nxl_l = 0
	871	nyn_l = ( nyn_l-nys_l+1 ) * pdims(2) - 1
	872	nys_l = 0
	873	!
	874	!-- The size of this gathered array must not be larger than the
	875	!-- array tend, which is used in the multigrid scheme as a temporary
[778]	876	!-- array. Therefore the subdomain size of an PE is calculated and
	877	!-- the size of the gathered grid. These values are used in
	878	!-- routines pres and poismg
	879	subdomain_size = ( nxr - nxl + 2 * nbgp + 1 ) * &
	880	( nyn - nys + 2 * nbgp + 1 ) * ( nzt - nzb + 2 )
[1]	881	gathered_size = ( nxr_l - nxl_l + 3 ) * ( nyn_l - nys_l + 3 ) * &
	882	( nzt_l - nzb + 2 )
	883
[809]	884	#elif ! defined ( __parallel )
[254]	885	message_string = 'multigrid gather/scatter impossible ' // &
[1]	886	'in non parallel mode'
[254]	887	CALL message( 'init_pegrid', 'PA0237', 1, 2, 0, 6, 0 )
[1]	888	#endif
	889	ENDIF
	890
	891	nxl_mg(i) = nxl_l
	892	nxr_mg(i) = nxr_l
	893	nys_mg(i) = nys_l
	894	nyn_mg(i) = nyn_l
	895	nzt_mg(i) = nzt_l
	896
	897	nxl_l = nxl_l / 2
	898	nxr_l = nxr_l / 2
	899	nys_l = nys_l / 2
	900	nyn_l = nyn_l / 2
	901	nzt_l = nzt_l / 2
[778]	902
[1]	903	ENDDO
	904
[780]	905	!
	906	!-- Temporary problem: Currently calculation of maxerror iin routine poismg crashes
	907	!-- if grid data are collected on PE0 already on the finest grid level.
	908	!-- To be solved later.
	909	IF ( maximum_grid_level == mg_switch_to_pe0_level ) THEN
	910	message_string = 'grid coarsening on subdomain level cannot be performed'
	911	CALL message( 'poismg', 'PA0236', 1, 2, 0, 6, 0 )
	912	ENDIF
	913
[1]	914	ELSE
	915
[667]	916	maximum_grid_level = 0
[1]	917
	918	ENDIF
	919
[722]	920	!
	921	!-- Default level 0 tells exchange_horiz that all ghost planes have to be
	922	!-- exchanged. grid_level is adjusted in poismg, where only one ghost plane
	923	!-- is required.
	924	grid_level = 0
[1]	925
[809]	926	#if defined( __parallel ) && ! defined ( __check )
[1]	927	!
	928	!-- Gridpoint number for the exchange of ghost points (y-line for 2D-arrays)
[667]	929	ngp_y = nyn - nys + 1 + 2 * nbgp
[1]	930
	931	!
[709]	932	!-- Define new MPI derived datatypes for the exchange of ghost points in
	933	!-- x- and y-direction for 2D-arrays (line)
	934	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_REAL, type_x, &
	935	ierr )
[1]	936	CALL MPI_TYPE_COMMIT( type_x, ierr )
[709]	937	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_INTEGER, &
	938	type_x_int, ierr )
[1]	939	CALL MPI_TYPE_COMMIT( type_x_int, ierr )
	940
[667]	941	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_REAL, type_y, ierr )
	942	CALL MPI_TYPE_COMMIT( type_y, ierr )
	943	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_INTEGER, type_y_int, ierr )
	944	CALL MPI_TYPE_COMMIT( type_y_int, ierr )
	945
	946
[1]	947	!
	948	!-- Calculate gridpoint numbers for the exchange of ghost points along x
	949	!-- (yz-plane for 3D-arrays) and define MPI derived data type(s) for the
	950	!-- exchange of ghost points in y-direction (xz-plane).
	951	!-- Do these calculations for the model grid and (if necessary) also
	952	!-- for the coarser grid levels used in the multigrid method
[667]	953	ALLOCATE ( ngp_yz(0:maximum_grid_level), type_xz(0:maximum_grid_level),&
	954	type_yz(0:maximum_grid_level) )
[1]	955
	956	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzb_l = nzb; nzt_l = nzt
[709]	957
[667]	958	!
	959	!-- Discern between the model grid, which needs nbgp ghost points and
	960	!-- grid levels for the multigrid scheme. In the latter case only one
	961	!-- ghost point is necessary.
[709]	962	!-- First definition of MPI-datatypes for exchange of ghost layers on normal
[667]	963	!-- grid. The following loop is needed for data exchange in poismg.f90.
	964	!
	965	!-- Determine number of grid points of yz-layer for exchange
	966	ngp_yz(0) = (nzt - nzb + 2) * (nyn - nys + 1 + 2 * nbgp)
[709]	967
[667]	968	!
[709]	969	!-- Define an MPI-datatype for the exchange of left/right boundaries.
	970	!-- Although data are contiguous in physical memory (which does not
	971	!-- necessarily require an MPI-derived datatype), the data exchange between
	972	!-- left and right PE's using the MPI-derived type is 10% faster than without.
[667]	973	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2nbgp, nbgp(nzt-nzb+2), ngp_yz(0), &
[709]	974	MPI_REAL, type_xz(0), ierr )
[667]	975	CALL MPI_TYPE_COMMIT( type_xz(0), ierr )
[1]	976
[709]	977	CALL MPI_TYPE_VECTOR( nbgp, ngp_yz(0), ngp_yz(0), MPI_REAL, type_yz(0), &
	978	ierr )
[667]	979	CALL MPI_TYPE_COMMIT( type_yz(0), ierr )
[709]	980
[667]	981	!
[709]	982	!-- Definition of MPI-datatypes for multigrid method (coarser level grids)
[667]	983	IF ( psolver == 'multigrid' ) THEN
	984	!
[709]	985	!-- Definition of MPI-datatyoe as above, but only 1 ghost level is used
	986	DO i = maximum_grid_level, 1 , -1
	987
[667]	988	ngp_yz(i) = (nzt_l - nzb_l + 2) * (nyn_l - nys_l + 3)
	989
	990	CALL MPI_TYPE_VECTOR( nxr_l-nxl_l+3, nzt_l-nzb_l+2, ngp_yz(i), &
[709]	991	MPI_REAL, type_xz(i), ierr )
[667]	992	CALL MPI_TYPE_COMMIT( type_xz(i), ierr )
[1]	993
[709]	994	CALL MPI_TYPE_VECTOR( 1, ngp_yz(i), ngp_yz(i), MPI_REAL, type_yz(i), &
	995	ierr )
[667]	996	CALL MPI_TYPE_COMMIT( type_yz(i), ierr )
	997
	998	nxl_l = nxl_l / 2
	999	nxr_l = nxr_l / 2
	1000	nys_l = nys_l / 2
	1001	nyn_l = nyn_l / 2
	1002	nzt_l = nzt_l / 2
[709]	1003
[667]	1004	ENDDO
[709]	1005
	1006	ENDIF
[1]	1007	#endif
	1008
[809]	1009	#if defined( __parallel ) && ! defined ( __check )
[1]	1010	!
	1011	!-- Setting of flags for inflow/outflow conditions in case of non-cyclic
[106]	1012	!-- horizontal boundary conditions.
[1]	1013	IF ( pleft == MPI_PROC_NULL ) THEN
[1159]	1014	IF ( bc_lr == 'dirichlet/radiation' ) THEN
[1]	1015	inflow_l = .TRUE.
[1159]	1016	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
[1]	1017	outflow_l = .TRUE.
	1018	ENDIF
	1019	ENDIF
	1020
	1021	IF ( pright == MPI_PROC_NULL ) THEN
[1159]	1022	IF ( bc_lr == 'dirichlet/radiation' ) THEN
[1]	1023	outflow_r = .TRUE.
[1159]	1024	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
[1]	1025	inflow_r = .TRUE.
	1026	ENDIF
	1027	ENDIF
	1028
	1029	IF ( psouth == MPI_PROC_NULL ) THEN
[1159]	1030	IF ( bc_ns == 'dirichlet/radiation' ) THEN
[1]	1031	outflow_s = .TRUE.
[1159]	1032	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
[1]	1033	inflow_s = .TRUE.
	1034	ENDIF
	1035	ENDIF
	1036
	1037	IF ( pnorth == MPI_PROC_NULL ) THEN
[1159]	1038	IF ( bc_ns == 'dirichlet/radiation' ) THEN
[1]	1039	inflow_n = .TRUE.
[1159]	1040	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
[1]	1041	outflow_n = .TRUE.
	1042	ENDIF
	1043	ENDIF
	1044
[151]	1045	!
	1046	!-- Broadcast the id of the inflow PE
	1047	IF ( inflow_l ) THEN
[163]	1048	id_inflow_l = myidx
[151]	1049	ELSE
	1050	id_inflow_l = 0
	1051	ENDIF
[622]	1052	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
[151]	1053	CALL MPI_ALLREDUCE( id_inflow_l, id_inflow, 1, MPI_INTEGER, MPI_SUM, &
	1054	comm1dx, ierr )
	1055
[163]	1056	!
	1057	!-- Broadcast the id of the recycling plane
	1058	!-- WARNING: needs to be adjusted in case of inflows other than from left side!
[1139]	1059	IF ( NINT( recycling_width / dx ) >= nxl .AND. &
	1060	NINT( recycling_width / dx ) <= nxr ) THEN
[163]	1061	id_recycling_l = myidx
	1062	ELSE
	1063	id_recycling_l = 0
	1064	ENDIF
[622]	1065	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
[163]	1066	CALL MPI_ALLREDUCE( id_recycling_l, id_recycling, 1, MPI_INTEGER, MPI_SUM, &
	1067	comm1dx, ierr )
	1068
[809]	1069	#elif ! defined ( __parallel )
[1159]	1070	IF ( bc_lr == 'dirichlet/radiation' ) THEN
[1]	1071	inflow_l = .TRUE.
	1072	outflow_r = .TRUE.
[1159]	1073	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
[1]	1074	outflow_l = .TRUE.
	1075	inflow_r = .TRUE.
	1076	ENDIF
	1077
[1159]	1078	IF ( bc_ns == 'dirichlet/radiation' ) THEN
[1]	1079	inflow_n = .TRUE.
	1080	outflow_s = .TRUE.
[1159]	1081	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
[1]	1082	outflow_n = .TRUE.
	1083	inflow_s = .TRUE.
	1084	ENDIF
	1085	#endif
[807]	1086
[106]	1087	!
[978]	1088	!-- At the inflow or outflow, u or v, respectively, have to be calculated for
	1089	!-- one more grid point.
	1090	IF ( inflow_l .OR. outflow_l ) THEN
[106]	1091	nxlu = nxl + 1
	1092	ELSE
	1093	nxlu = nxl
	1094	ENDIF
[978]	1095	IF ( inflow_s .OR. outflow_s ) THEN
[106]	1096	nysv = nys + 1
	1097	ELSE
	1098	nysv = nys
	1099	ENDIF
[1]	1100
[114]	1101	!
	1102	!-- Allocate wall flag arrays used in the multigrid solver
	1103	IF ( psolver == 'multigrid' ) THEN
	1104
	1105	DO i = maximum_grid_level, 1, -1
	1106
	1107	SELECT CASE ( i )
	1108
	1109	CASE ( 1 )
	1110	ALLOCATE( wall_flags_1(nzb:nzt_mg(i)+1, &
	1111	nys_mg(i)-1:nyn_mg(i)+1, &
	1112	nxl_mg(i)-1:nxr_mg(i)+1) )
	1113
	1114	CASE ( 2 )
	1115	ALLOCATE( wall_flags_2(nzb:nzt_mg(i)+1, &
	1116	nys_mg(i)-1:nyn_mg(i)+1, &
	1117	nxl_mg(i)-1:nxr_mg(i)+1) )
	1118
	1119	CASE ( 3 )
	1120	ALLOCATE( wall_flags_3(nzb:nzt_mg(i)+1, &
	1121	nys_mg(i)-1:nyn_mg(i)+1, &
	1122	nxl_mg(i)-1:nxr_mg(i)+1) )
	1123
	1124	CASE ( 4 )
	1125	ALLOCATE( wall_flags_4(nzb:nzt_mg(i)+1, &
	1126	nys_mg(i)-1:nyn_mg(i)+1, &
	1127	nxl_mg(i)-1:nxr_mg(i)+1) )
	1128
	1129	CASE ( 5 )
	1130	ALLOCATE( wall_flags_5(nzb:nzt_mg(i)+1, &
	1131	nys_mg(i)-1:nyn_mg(i)+1, &
	1132	nxl_mg(i)-1:nxr_mg(i)+1) )
	1133
	1134	CASE ( 6 )
	1135	ALLOCATE( wall_flags_6(nzb:nzt_mg(i)+1, &
	1136	nys_mg(i)-1:nyn_mg(i)+1, &
	1137	nxl_mg(i)-1:nxr_mg(i)+1) )
	1138
	1139	CASE ( 7 )
	1140	ALLOCATE( wall_flags_7(nzb:nzt_mg(i)+1, &
	1141	nys_mg(i)-1:nyn_mg(i)+1, &
	1142	nxl_mg(i)-1:nxr_mg(i)+1) )
	1143
	1144	CASE ( 8 )
	1145	ALLOCATE( wall_flags_8(nzb:nzt_mg(i)+1, &
	1146	nys_mg(i)-1:nyn_mg(i)+1, &
	1147	nxl_mg(i)-1:nxr_mg(i)+1) )
	1148
	1149	CASE ( 9 )
	1150	ALLOCATE( wall_flags_9(nzb:nzt_mg(i)+1, &
	1151	nys_mg(i)-1:nyn_mg(i)+1, &
	1152	nxl_mg(i)-1:nxr_mg(i)+1) )
	1153
	1154	CASE ( 10 )
	1155	ALLOCATE( wall_flags_10(nzb:nzt_mg(i)+1, &
	1156	nys_mg(i)-1:nyn_mg(i)+1, &
	1157	nxl_mg(i)-1:nxr_mg(i)+1) )
	1158
	1159	CASE DEFAULT
[254]	1160	message_string = 'more than 10 multigrid levels'
	1161	CALL message( 'init_pegrid', 'PA0238', 1, 2, 0, 6, 0 )
[114]	1162
	1163	END SELECT
	1164
	1165	ENDDO
	1166
	1167	ENDIF
	1168
[759]	1169	!
	1170	!-- Calculate the number of groups into which parallel I/O is split.
	1171	!-- The default for files which are opened by all PEs (or where each
	1172	!-- PE opens his own independent file) is, that all PEs are doing input/output
	1173	!-- in parallel at the same time. This might cause performance or even more
	1174	!-- severe problems depending on the configuration of the underlying file
	1175	!-- system.
	1176	!-- First, set the default:
	1177	IF ( maximum_parallel_io_streams == -1 .OR. &
	1178	maximum_parallel_io_streams > numprocs ) THEN
	1179	maximum_parallel_io_streams = numprocs
	1180	ENDIF
	1181
	1182	!
	1183	!-- Now calculate the number of io_blocks and the io_group to which the
	1184	!-- respective PE belongs. I/O of the groups is done in serial, but in parallel
	1185	!-- for all PEs belonging to the same group. A preliminary setting with myid
	1186	!-- based on MPI_COMM_WORLD has been done in parin.
	1187	io_blocks = numprocs / maximum_parallel_io_streams
	1188	io_group = MOD( myid+1, io_blocks )
	1189
	1190
[1]	1191	END SUBROUTINE init_pegrid

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