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source: palm/trunk/SOURCE/exchange_horiz_mod.f90 @ 4554

Last change on this file since 4554 was 4474, checked in by raasch, 5 years ago
bugfix for correct usage of alternative communicators in case of 1d-decompositions and in non-parallel mode
Property svn:keywords set to `Id`
File size: 32.0 KB

Rev	Line
[1682]	1	!> @file exchange_horiz.f90
[1320]	2	!------------------------------------------------------------------------------!
[2696]	3	! This file is part of the PALM model system.
[1036]	4	!
[2000]	5	! PALM is free software: you can redistribute it and/or modify it under the
	6	! terms of the GNU General Public License as published by the Free Software
	7	! Foundation, either version 3 of the License, or (at your option) any later
	8	! version.
[1036]	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	!
[4360]	17	! Copyright 1997-2020 Leibniz Universitaet Hannover
[1320]	18	!------------------------------------------------------------------------------!
[1036]	19	!
[484]	20	! Current revisions:
[1]	21	! -----------------
[1678]	22	!
[2119]	23	!
[1321]	24	! Former revisions:
	25	! -----------------
	26	! $Id: exchange_horiz_mod.f90 4474 2020-03-26 09:32:18Z eckhard $
[4474]	27	! bugfix for correct usage of alternative communicators in case of 1d-decompositions and in
	28	! non-parallel mode
	29	!
	30	! 4461 2020-03-12 16:51:59Z raasch
[4461]	31	! optional communicator added to exchange_horiz
	32	!
	33	! 4457 2020-03-11 14:20:43Z raasch
[4457]	34	! routine has been modularized, file exchange_horiz_2d has been merged
	35	!
	36	! 4429 2020-02-27 15:24:30Z raasch
[4429]	37	! bugfix: cpp-directives added for serial mode
	38	!
	39	! 4360 2020-01-07 11:25:50Z suehring
[4182]	40	! Corrected "Former revisions" section
	41	!
	42	! 3761 2019-02-25 15:31:42Z raasch
[3761]	43	! OpenACC directives re-formatted
	44	!
	45	! 3657 2019-01-07 20:14:18Z knoop
[3634]	46	! OpenACC port for SPEC
[1321]	47	!
[4182]	48	! Revision 1.1 1997/07/24 11:13:29 raasch
	49	! Initial revision
	50	!
	51	!
[1]	52	! Description:
	53	! ------------
[4461]	54	!> Exchange of ghost point layers for subdomains (in parallel mode) and setting
	55	!> of cyclic lateral boundary conditions for the total domain .
[1]	56	!------------------------------------------------------------------------------!
[4457]	57	MODULE exchange_horiz_mod
	58
	59	USE kinds
	60
	61	USE pegrid
	62
	63	IMPLICIT NONE
	64
	65	PRIVATE
	66	PUBLIC exchange_horiz, exchange_horiz_int, exchange_horiz_2d, exchange_horiz_2d_byte, &
	67	exchange_horiz_2d_int
	68
	69	INTERFACE exchange_horiz
	70	MODULE PROCEDURE exchange_horiz
	71	END INTERFACE exchange_horiz
	72
	73	INTERFACE exchange_horiz_int
	74	MODULE PROCEDURE exchange_horiz_int
	75	END INTERFACE exchange_horiz_int
	76
	77	INTERFACE exchange_horiz_2d
	78	MODULE PROCEDURE exchange_horiz_2d
	79	END INTERFACE exchange_horiz_2d
	80
	81	INTERFACE exchange_horiz_2d_byte
	82	MODULE PROCEDURE exchange_horiz_2d_byte
	83	END INTERFACE exchange_horiz_2d_byte
	84
	85	INTERFACE exchange_horiz_2d_int
	86	MODULE PROCEDURE exchange_horiz_2d_int
	87	END INTERFACE exchange_horiz_2d_int
	88
	89
	90	CONTAINS
	91
	92
[4461]	93	!------------------------------------------------------------------------------!
	94	! Description:
	95	! ------------
	96	!> Exchange of ghost point layers for subdomains (in parallel mode) and setting
	97	!> of cyclic lateral boundary conditions for the total domain.
	98	!> This routine is for REAL 3d-arrays.
	99	!------------------------------------------------------------------------------!
	100	SUBROUTINE exchange_horiz( ar, nbgp_local, alternative_communicator)
[1]	101
[1320]	102	USE control_parameters, &
[4429]	103	ONLY: bc_lr_cyc, bc_ns_cyc
	104
	105	#if defined( __parallel )
	106	USE control_parameters, &
	107	ONLY: grid_level, mg_switch_to_pe0, synchronous_exchange
	108	#endif
[1320]	109
	110	USE cpulog, &
	111	ONLY: cpu_log, log_point_s
	112
	113	USE indices, &
	114	ONLY: nxl, nxr, nyn, nys, nzb, nzt
	115
[1]	116
[3761]	117	#if defined( _OPENACC )
[3634]	118	INTEGER(iwp) :: i !<
	119	#endif
[3761]	120
[4461]	121	INTEGER(iwp), OPTIONAL :: alternative_communicator !< alternative MPI communicator to be used
	122	INTEGER(iwp) :: communicator !< communicator that is used as argument in MPI calls
	123	INTEGER(iwp) :: left_pe !< id of left pe that is used as argument in MPI calls
	124	INTEGER(iwp) :: nbgp_local !< number of ghost point layers
	125	INTEGER(iwp) :: north_pe !< id of north pe that is used as argument in MPI calls
	126	INTEGER(iwp) :: right_pe !< id of right pe that is used as argument in MPI calls
	127	INTEGER(iwp) :: south_pe !< id of south pe that is used as argument in MPI calls
[1320]	128
	129	REAL(wp), DIMENSION(nzb:nzt+1,nys-nbgp_local:nyn+nbgp_local, &
[4461]	130	nxl-nbgp_local:nxr+nbgp_local) :: ar !< 3d-array for which exchange is done
[1320]	131
[841]	132
[1]	133	CALL cpu_log( log_point_s(2), 'exchange_horiz', 'start' )
	134
[3761]	135	#if defined( _OPENACC )
[3657]	136	!$ACC UPDATE IF_PRESENT ASYNC(1) &
[3634]	137	!$ACC HOST(ar(:,:,nxr-nbgp_local+1:nxr)) &
	138	!$ACC HOST(ar(:,:,nxl:nxl+nbgp_local-1))
[3657]	139
	140	!
	141	!-- Wait for first UPDATE to complete before starting the others.
	142	!$ACC WAIT(1) ASYNC(2)
	143	! ar(:,:,nxl-nbgp_local:nxl-1) is overwritten by first part below
	144	! ar(:,:,nxl:nxl+nbgp_local-1) has been transferred above
	145	DO i = nxl+nbgp_local, nxr-nbgp_local
	146	!$ACC UPDATE IF_PRESENT ASYNC(2) &
[3634]	147	!$ACC HOST(ar(:,nyn-nbgp_local+1:nyn,i)) &
	148	!$ACC HOST(ar(:,nys:nys+nbgp_local-1,i))
	149	ENDDO
[3657]	150	! ar(:,:,nxr-nbgp_local+1:nxr) has been transferred above
	151	! ar(:,:,nxr+1:nxr+nbgp_local) is overwritten by first part below
	152
	153	!
	154	!-- Wait for first UPDATE to complete before starting MPI.
	155	!$ACC WAIT(1)
[3634]	156	#endif
	157
[4461]	158	!
	159	!-- Set the communicator to be used
	160	IF ( PRESENT( alternative_communicator ) ) THEN
	161	!
	162	!-- Alternative communicator is to be used
	163	communicator = communicator_configurations(alternative_communicator)%mpi_communicator
	164	left_pe = communicator_configurations(alternative_communicator)%pleft
	165	right_pe = communicator_configurations(alternative_communicator)%pright
	166	south_pe = communicator_configurations(alternative_communicator)%psouth
	167	north_pe = communicator_configurations(alternative_communicator)%pnorth
	168
	169	ELSE
	170	!
	171	!-- Main communicator is to be used
	172	communicator = comm2d
	173	left_pe = pleft
	174	right_pe = pright
	175	south_pe = psouth
	176	north_pe = pnorth
	177
	178	ENDIF
	179
[1]	180	#if defined( __parallel )
	181
	182	!
[1128]	183	!-- Exchange in x-direction of lateral boundaries
[1]	184	IF ( pdims(1) == 1 .OR. mg_switch_to_pe0 ) THEN
	185	!
	186	!-- One-dimensional decomposition along y, boundary values can be exchanged
	187	!-- within the PE memory
[4474]	188	IF ( PRESENT( alternative_communicator ) ) THEN
	189	IF ( alternative_communicator <= 2 ) THEN
	190	ar(:,:,nxl-nbgp_local:nxl-1) = ar(:,:,nxr-nbgp_local+1:nxr)
	191	ar(:,:,nxr+1:nxr+nbgp_local) = ar(:,:,nxl:nxl+nbgp_local-1)
	192	ENDIF
	193	ELSE
	194	IF ( bc_lr_cyc ) THEN
	195	ar(:,:,nxl-nbgp_local:nxl-1) = ar(:,:,nxr-nbgp_local+1:nxr)
	196	ar(:,:,nxr+1:nxr+nbgp_local) = ar(:,:,nxl:nxl+nbgp_local-1)
	197	ENDIF
[1]	198	ENDIF
	199
	200	ELSE
[75]	201
[683]	202	IF ( synchronous_exchange ) THEN
[1]	203	!
[683]	204	!-- Send left boundary, receive right one (synchronous)
[4461]	205	CALL MPI_SENDRECV( ar(nzb,nys-nbgp_local,nxl), 1, type_yz(grid_level), left_pe, 0, &
	206	ar(nzb,nys-nbgp_local,nxr+1), 1, type_yz(grid_level), right_pe, 0, &
	207	communicator, status, ierr )
[1]	208	!
[683]	209	!-- Send right boundary, receive left one (synchronous)
[4461]	210	CALL MPI_SENDRECV( ar(nzb,nys-nbgp_local,nxr+1-nbgp_local), 1, &
	211	type_yz(grid_level), right_pe, 1, &
	212	ar(nzb,nys-nbgp_local,nxl-nbgp_local), 1, &
	213	type_yz(grid_level), left_pe, 1, &
	214	communicator, status, ierr )
[667]	215
[683]	216	ELSE
[667]	217
[683]	218	!
[2298]	219	!-- Asynchroneous exchange
[1128]	220	IF ( send_receive == 'lr' .OR. send_receive == 'al' ) THEN
	221
[2298]	222	req(1:4) = 0
	223	req_count = 0
[683]	224	!
[1128]	225	!-- Send left boundary, receive right one (asynchronous)
[4461]	226	CALL MPI_ISEND( ar(nzb,nys-nbgp_local,nxl), 1, type_yz(grid_level), left_pe, &
	227	req_count, communicator, req(req_count+1), ierr )
	228	CALL MPI_IRECV( ar(nzb,nys-nbgp_local,nxr+1), 1, type_yz(grid_level), right_pe, &
	229	req_count, communicator, req(req_count+2), ierr )
[1128]	230	!
	231	!-- Send right boundary, receive left one (asynchronous)
[4461]	232	CALL MPI_ISEND( ar(nzb,nys-nbgp_local,nxr+1-nbgp_local), 1, type_yz(grid_level), &
	233	right_pe, req_count+1, communicator, req(req_count+3), ierr )
	234	CALL MPI_IRECV( ar(nzb,nys-nbgp_local,nxl-nbgp_local), 1, type_yz(grid_level), &
	235	left_pe, req_count+1, communicator, req(req_count+4), ierr )
[667]	236
[2298]	237	CALL MPI_WAITALL( 4, req, wait_stat, ierr )
[75]	238
[1128]	239	ENDIF
	240
[683]	241	ENDIF
	242
[1]	243	ENDIF
	244
[3657]	245	!$ACC UPDATE IF_PRESENT ASYNC(1) &
	246	!$ACC DEVICE(ar(:,:,nxl-nbgp_local:nxl-1)) &
	247	!$ACC DEVICE(ar(:,:,nxr+1:nxr+nbgp_local))
[1]	248
[3657]	249	!
	250	!-- Wait for UPDATES above to complete before starting MPI.
	251	!$ACC WAIT(2)
	252
[1]	253	IF ( pdims(2) == 1 .OR. mg_switch_to_pe0 ) THEN
	254	!
	255	!-- One-dimensional decomposition along x, boundary values can be exchanged
	256	!-- within the PE memory
[4474]	257	IF ( PRESENT( alternative_communicator ) ) THEN
	258	IF ( alternative_communicator == 1 .OR. alternative_communicator == 3 ) THEN
	259	ar(:,nys-nbgp_local:nys-1,:) = ar(:,nyn-nbgp_local+1:nyn,:)
	260	ar(:,nyn+1:nyn+nbgp_local,:) = ar(:,nys:nys+nbgp_local-1,:)
	261	ENDIF
	262	ELSE
	263	IF ( bc_ns_cyc ) THEN
	264	ar(:,nys-nbgp_local:nys-1,:) = ar(:,nyn-nbgp_local+1:nyn,:)
	265	ar(:,nyn+1:nyn+nbgp_local,:) = ar(:,nys:nys+nbgp_local-1,:)
	266	ENDIF
[1]	267	ENDIF
	268
	269	ELSE
	270
[683]	271	IF ( synchronous_exchange ) THEN
[1]	272	!
[683]	273	!-- Send front boundary, receive rear one (synchronous)
[4461]	274	CALL MPI_SENDRECV( ar(nzb,nys,nxl-nbgp_local), 1, type_xz(grid_level), south_pe, 0, &
	275	ar(nzb,nyn+1,nxl-nbgp_local), 1, type_xz(grid_level), north_pe, 0, &
	276	communicator, status, ierr )
[683]	277	!
	278	!-- Send rear boundary, receive front one (synchronous)
[4461]	279	CALL MPI_SENDRECV( ar(nzb,nyn-nbgp_local+1,nxl-nbgp_local), 1, &
	280	type_xz(grid_level), north_pe, 1, &
	281	ar(nzb,nys-nbgp_local,nxl-nbgp_local), 1, &
	282	type_xz(grid_level), south_pe, 1, &
	283	communicator, status, ierr )
[667]	284
[683]	285	ELSE
	286
[1]	287	!
[2298]	288	!-- Asynchroneous exchange
[1569]	289	IF ( send_receive == 'ns' .OR. send_receive == 'al' ) THEN
[1128]	290
[2298]	291	req(1:4) = 0
	292	req_count = 0
[1128]	293
[683]	294	!
[1128]	295	!-- Send front boundary, receive rear one (asynchronous)
[4461]	296	CALL MPI_ISEND( ar(nzb,nys,nxl-nbgp_local), 1, type_xz(grid_level), south_pe, &
	297	req_count, communicator, req(req_count+1), ierr )
	298	CALL MPI_IRECV( ar(nzb,nyn+1,nxl-nbgp_local), 1, type_xz(grid_level), north_pe, &
	299	req_count, communicator, req(req_count+2), ierr )
[1128]	300	!
	301	!-- Send rear boundary, receive front one (asynchronous)
[4461]	302	CALL MPI_ISEND( ar(nzb,nyn-nbgp_local+1,nxl-nbgp_local), 1, type_xz(grid_level), &
	303	north_pe, req_count+1, communicator, req(req_count+3), ierr )
	304	CALL MPI_IRECV( ar(nzb,nys-nbgp_local,nxl-nbgp_local), 1, type_xz(grid_level), &
	305	south_pe, req_count+1, communicator, req(req_count+4), ierr )
[75]	306
[2298]	307	CALL MPI_WAITALL( 4, req, wait_stat, ierr )
[683]	308
[1128]	309	ENDIF
	310
[683]	311	ENDIF
	312
[1]	313	ENDIF
	314
	315	#else
	316
	317	!
[1113]	318	!-- Lateral boundary conditions in the non-parallel case.
	319	!-- Case dependent, because in GPU mode still not all arrays are on device. This
	320	!-- workaround has to be removed later. Also, since PGI compiler 12.5 has problems
	321	!-- with array syntax, explicit loops are used.
[4474]	322	IF ( PRESENT( alternative_communicator ) ) THEN
	323	IF ( alternative_communicator <= 2 ) THEN
	324	ar(:,:,nxl-nbgp_local:nxl-1) = ar(:,:,nxr-nbgp_local+1:nxr)
	325	ar(:,:,nxr+1:nxr+nbgp_local) = ar(:,:,nxl:nxl+nbgp_local-1)
	326	ENDIF
	327	ELSE
	328	IF ( bc_lr_cyc ) THEN
	329	ar(:,:,nxl-nbgp_local:nxl-1) = ar(:,:,nxr-nbgp_local+1:nxr)
	330	ar(:,:,nxr+1:nxr+nbgp_local) = ar(:,:,nxl:nxl+nbgp_local-1)
	331	ENDIF
[1]	332	ENDIF
	333
[3657]	334	!$ACC UPDATE IF_PRESENT ASYNC(1) &
	335	!$ACC DEVICE(ar(:,:,nxl-nbgp_local:nxl-1)) &
	336	!$ACC DEVICE(ar(:,:,nxr+1:nxr+nbgp_local))
	337
	338	!
	339	!-- Wait for UPDATES above to complete before starting MPI.
	340	!$ACC WAIT(2)
	341
[4474]	342	IF ( PRESENT( alternative_communicator ) ) THEN
	343	IF ( alternative_communicator == 1 .OR. alternative_communicator == 3 ) THEN
	344	ar(:,nys-nbgp_local:nys-1,:) = ar(:,nyn-nbgp_local+1:nyn,:)
	345	ar(:,nyn+1:nyn+nbgp_local,:) = ar(:,nys:nys+nbgp_local-1,:)
	346	ENDIF
	347	ELSE
	348	IF ( bc_ns_cyc ) THEN
	349	ar(:,nys-nbgp_local:nys-1,:) = ar(:,nyn-nbgp_local+1:nyn,:)
	350	ar(:,nyn+1:nyn+nbgp_local,:) = ar(:,nys:nys+nbgp_local-1,:)
	351	ENDIF
[1]	352	ENDIF
	353
	354	#endif
[3634]	355
[3761]	356	#if defined( _OPENACC )
[3634]	357	DO i = nxl-nbgp_local, nxr+nbgp_local
[3657]	358	!$ACC UPDATE IF_PRESENT ASYNC(2) &
[3634]	359	!$ACC DEVICE(ar(:,nys-nbgp_local:nys-1,i)) &
	360	!$ACC DEVICE(ar(:,nyn+1:nyn+nbgp_local,i))
	361	ENDDO
[3657]	362
	363	!
	364	!-- Wait for all UPDATEs to finish.
	365	!$ACC WAIT
[3634]	366	#endif
	367
[1]	368	CALL cpu_log( log_point_s(2), 'exchange_horiz', 'stop' )
	369
	370	END SUBROUTINE exchange_horiz
[1677]	371
	372
[1682]	373	!------------------------------------------------------------------------------!
	374	! Description:
	375	! ------------
	376	!> @todo Missing subroutine description.
	377	!------------------------------------------------------------------------------!
[4429]	378	SUBROUTINE exchange_horiz_int( ar, nys_l, nyn_l, nxl_l, nxr_l, nzt_l, nbgp_local )
[1677]	379
[4429]	380
[1677]	381	USE control_parameters, &
[4429]	382	ONLY: bc_lr_cyc, bc_ns_cyc
	383
	384	#if defined( __parallel )
	385	USE control_parameters, &
	386	ONLY: grid_level
	387	#endif
[1677]	388
	389	USE indices, &
[3241]	390	ONLY: nzb
[1677]	391
[2696]	392	INTEGER(iwp) :: nxl_l !< local index bound at current grid level, left side
	393	INTEGER(iwp) :: nxr_l !< local index bound at current grid level, right side
	394	INTEGER(iwp) :: nyn_l !< local index bound at current grid level, north side
	395	INTEGER(iwp) :: nys_l !< local index bound at current grid level, south side
	396	INTEGER(iwp) :: nzt_l !< local index bound at current grid level, top
[1682]	397	INTEGER(iwp) :: nbgp_local !< number of ghost points
[1677]	398
[2696]	399	INTEGER(iwp), DIMENSION(nzb:nzt_l+1,nys_l-nbgp_local:nyn_l+nbgp_local, &
	400	nxl_l-nbgp_local:nxr_l+nbgp_local) :: ar !< treated array
[1677]	401
	402
	403	#if defined( __parallel )
	404	IF ( pdims(1) == 1 ) THEN
	405	!
	406	!-- One-dimensional decomposition along y, boundary values can be exchanged
	407	!-- within the PE memory
	408	IF ( bc_lr_cyc ) THEN
[2696]	409	ar(:,:,nxl_l-nbgp_local:nxl_l-1) = ar(:,:,nxr_l-nbgp_local+1:nxr_l)
	410	ar(:,:,nxr_l+1:nxr_l+nbgp_local) = ar(:,:,nxl_l:nxl_l+nbgp_local-1)
[1677]	411	ENDIF
	412	ELSE
	413	!
	414	!-- Send left boundary, receive right one (synchronous)
[2696]	415	CALL MPI_SENDRECV( &
	416	ar(nzb,nys_l-nbgp_local,nxl_l), 1, type_yz_int(grid_level), pleft, 0,&
	417	ar(nzb,nys_l-nbgp_local,nxr_l+1), 1, type_yz_int(grid_level), pright, 0,&
[1677]	418	comm2d, status, ierr )
	419	!
	420	!-- Send right boundary, receive left one (synchronous)
[2696]	421	CALL MPI_SENDRECV( &
	422	ar(nzb,nys_l-nbgp_local,nxr_l+1-nbgp_local), 1, type_yz_int(grid_level),&
	423	pright, 1, &
	424	ar(nzb,nys_l-nbgp_local,nxl_l-nbgp_local), 1, type_yz_int(grid_level),&
	425	pleft, 1, &
[1677]	426	comm2d, status, ierr )
	427	ENDIF
	428
	429
	430	IF ( pdims(2) == 1 ) THEN
	431	!
	432	!-- One-dimensional decomposition along x, boundary values can be exchanged
	433	!-- within the PE memory
	434	IF ( bc_ns_cyc ) THEN
[2696]	435	ar(:,nys_l-nbgp_local:nys_l-1,:) = ar(:,nyn_l-nbgp_local+1:nyn_l,:)
	436	ar(:,nyn_l+1:nyn_l+nbgp_local,:) = ar(:,nys_l:nys_l+nbgp_local-1,:)
[1677]	437	ENDIF
	438
	439	ELSE
	440
	441	!
	442	!-- Send front boundary, receive rear one (synchronous)
[2696]	443	CALL MPI_SENDRECV( &
	444	ar(nzb,nys_l,nxl_l-nbgp_local), 1, type_xz_int(grid_level), psouth, 0,&
	445	ar(nzb,nyn_l+1,nxl_l-nbgp_local), 1, type_xz_int(grid_level), pnorth, 0,&
[1677]	446	comm2d, status, ierr )
	447	!
	448	!-- Send rear boundary, receive front one (synchronous)
[2696]	449	CALL MPI_SENDRECV( ar(nzb,nyn_l-nbgp_local+1,nxl_l-nbgp_local), 1, &
	450	type_xz_int(grid_level), pnorth, 1, &
	451	ar(nzb,nys_l-nbgp_local,nxl_l-nbgp_local), 1, &
	452	type_xz_int(grid_level), psouth, 1, &
[1677]	453	comm2d, status, ierr )
	454
	455	ENDIF
	456
	457	#else
	458
[3241]	459	IF ( bc_lr_cyc ) THEN
[2696]	460	ar(:,:,nxl_l-nbgp_local:nxl_l-1) = ar(:,:,nxr_l-nbgp_local+1:nxr_l)
	461	ar(:,:,nxr_l+1:nxr_l+nbgp_local) = ar(:,:,nxl_l:nxl_l+nbgp_local-1)
[1677]	462	ENDIF
	463
[3241]	464	IF ( bc_ns_cyc ) THEN
[2696]	465	ar(:,nys_l-nbgp_local:nys_l-1,:) = ar(:,nyn_l-nbgp_local+1:nyn_l,:)
	466	ar(:,nyn_l+1:nyn_l+nbgp_local,:) = ar(:,nys_l:nys_l+nbgp_local-1,:)
[1677]	467	ENDIF
	468
	469	#endif
	470
[4457]	471	END SUBROUTINE exchange_horiz_int
[1677]	472
[4457]	473	! Description:
	474	! ------------
	475	!> Exchange of lateral (ghost) boundaries (parallel computers) and cyclic
	476	!> boundary conditions, respectively, for 2D-arrays.
	477	!------------------------------------------------------------------------------!
	478	SUBROUTINE exchange_horiz_2d( ar )
	479
	480	USE control_parameters, &
	481	ONLY : bc_dirichlet_l, bc_dirichlet_n, bc_dirichlet_r, &
	482	bc_dirichlet_s, bc_radiation_l, &
	483	bc_radiation_n, bc_radiation_r, bc_radiation_s
	484
	485	USE cpulog, &
	486	ONLY : cpu_log, log_point_s
	487
	488	USE indices, &
	489	ONLY : nbgp, nxl, nxlg, nxr, nxrg, nyn, nyng, nys, nysg
	490
	491	#if ! defined( __parallel )
	492	USE control_parameters, &
	493	ONLY: bc_lr_cyc, bc_ns_cyc
	494	#endif
	495
	496
	497	INTEGER(iwp) :: i !<
	498
	499	REAL(wp) :: ar(nysg:nyng,nxlg:nxrg) !<
	500
	501
	502	CALL cpu_log( log_point_s(13), 'exchange_horiz_2d', 'start' )
	503
	504	#if defined( __parallel )
	505
	506	!
	507	!-- Exchange of lateral boundary values for parallel computers
	508	IF ( pdims(1) == 1 ) THEN
	509
	510	!
	511	!-- One-dimensional decomposition along y, boundary values can be exchanged
	512	!-- within the PE memory
	513	ar(:,nxlg:nxl-1) = ar(:,nxr-nbgp+1:nxr)
	514	ar(:,nxr+1:nxrg) = ar(:,nxl:nxl+nbgp-1)
	515
	516	ELSE
	517	!
	518	!-- Send left boundary, receive right one
	519
	520	CALL MPI_SENDRECV( ar(nysg,nxl), 1, type_y, pleft, 0, &
	521	ar(nysg,nxr+1), 1, type_y, pright, 0, &
	522	comm2d, status, ierr )
	523	!
	524	!-- Send right boundary, receive left one
	525	CALL MPI_SENDRECV( ar(nysg,nxr+1-nbgp), 1, type_y, pright, 1, &
	526	ar(nysg,nxlg), 1, type_y, pleft, 1, &
	527	comm2d, status, ierr )
	528
	529
	530	ENDIF
	531
	532	IF ( pdims(2) == 1 ) THEN
	533	!
	534	!-- One-dimensional decomposition along x, boundary values can be exchanged
	535	!-- within the PE memory
	536	ar(nysg:nys-1,:) = ar(nyn-nbgp+1:nyn,:)
	537	ar(nyn+1:nyng,:) = ar(nys:nys+nbgp-1,:)
	538
	539	ELSE
	540	!
	541	!-- Send front boundary, receive rear one
	542
	543	CALL MPI_SENDRECV( ar(nys,nxlg), 1, type_x, psouth, 0, &
	544	ar(nyn+1,nxlg), 1, type_x, pnorth, 0, &
	545	comm2d, status, ierr )
	546	!
	547	!-- Send rear boundary, receive front one
	548	CALL MPI_SENDRECV( ar(nyn+1-nbgp,nxlg), 1, type_x, pnorth, 1, &
	549	ar(nysg,nxlg), 1, type_x, psouth, 1, &
	550	comm2d, status, ierr )
	551
	552	ENDIF
	553
	554	#else
	555
	556	!
	557	!-- Lateral boundary conditions in the non-parallel case
	558	IF ( bc_lr_cyc ) THEN
	559	ar(:,nxlg:nxl-1) = ar(:,nxr-nbgp+1:nxr)
	560	ar(:,nxr+1:nxrg) = ar(:,nxl:nxl+nbgp-1)
	561	ENDIF
	562
	563	IF ( bc_ns_cyc ) THEN
	564	ar(nysg:nys-1,:) = ar(nyn-nbgp+1:nyn,:)
	565	ar(nyn+1:nyng,:) = ar(nys:nys+nbgp-1,:)
	566	ENDIF
	567
	568	#endif
	569
	570	!
	571	!-- Neumann-conditions at inflow/outflow/nested boundaries
	572	IF ( bc_dirichlet_l .OR. bc_radiation_l ) THEN
	573	DO i = nbgp, 1, -1
	574	ar(:,nxl-i) = ar(:,nxl)
	575	ENDDO
	576	ENDIF
	577	IF ( bc_dirichlet_r .OR. bc_radiation_r ) THEN
	578	DO i = 1, nbgp
	579	ar(:,nxr+i) = ar(:,nxr)
	580	ENDDO
	581	ENDIF
	582	IF ( bc_dirichlet_s .OR. bc_radiation_s ) THEN
	583	DO i = nbgp, 1, -1
	584	ar(nys-i,:) = ar(nys,:)
	585	ENDDO
	586	ENDIF
	587	IF ( bc_dirichlet_n .OR. bc_radiation_n ) THEN
	588	DO i = 1, nbgp
	589	ar(nyn+i,:) = ar(nyn,:)
	590	ENDDO
	591	ENDIF
	592
	593	CALL cpu_log( log_point_s(13), 'exchange_horiz_2d', 'stop' )
	594
	595	END SUBROUTINE exchange_horiz_2d
	596
	597
	598	!------------------------------------------------------------------------------!
	599	! Description:
	600	! ------------
	601	!> Exchange of lateral (ghost) boundaries (parallel computers) and cyclic
	602	!> boundary conditions, respectively, for 2D 8-bit integer arrays.
	603	!------------------------------------------------------------------------------!
	604	SUBROUTINE exchange_horiz_2d_byte( ar, nys_l, nyn_l, nxl_l, nxr_l, nbgp_local )
	605
	606
	607	USE control_parameters, &
	608	ONLY: bc_dirichlet_l, bc_dirichlet_n, bc_dirichlet_r, bc_dirichlet_s, &
	609	bc_radiation_l, bc_radiation_n, bc_radiation_r, bc_radiation_s, &
	610	bc_radiation_l, bc_radiation_n, bc_radiation_r, bc_radiation_s
	611
	612	USE cpulog, &
	613	ONLY: cpu_log, log_point_s
	614
	615	#if ! defined( __parallel )
	616	USE control_parameters, &
	617	ONLY: bc_lr_cyc, bc_ns_cyc
	618	#endif
	619
	620	INTEGER(iwp) :: i !< dummy index to zero-gradient conditions at in/outflow boundaries
	621	INTEGER(iwp) :: nxl_l !< local index bound at current grid level, left side
	622	INTEGER(iwp) :: nxr_l !< local index bound at current grid level, right side
	623	INTEGER(iwp) :: nyn_l !< local index bound at current grid level, north side
	624	INTEGER(iwp) :: nys_l !< local index bound at current grid level, south side
	625	INTEGER(iwp) :: nbgp_local !< number of ghost layers to be exchanged
	626
	627	INTEGER(KIND=1), DIMENSION(nys_l-nbgp_local:nyn_l+nbgp_local, &
	628	nxl_l-nbgp_local:nxr_l+nbgp_local) :: ar !< treated array
	629
	630	CALL cpu_log( log_point_s(13), 'exchange_horiz_2d', 'start' )
	631
	632	#if defined( __parallel )
	633
	634	!
	635	!-- Exchange of lateral boundary values for parallel computers
	636	IF ( pdims(1) == 1 ) THEN
	637
	638	!
	639	!-- One-dimensional decomposition along y, boundary values can be exchanged
	640	!-- within the PE memory
	641	ar(:,nxl_l-nbgp_local:nxl_l-1) = ar(:,nxr_l-nbgp_local+1:nxr_l)
	642	ar(:,nxr_l+1:nxr_l+nbgp_local) = ar(:,nxl_l:nxl_l+nbgp_local-1)
	643
	644	ELSE
	645	!
	646	!-- Send left boundary, receive right one
	647	CALL MPI_SENDRECV( ar(nys_l-nbgp_local,nxl_l), 1, &
	648	type_y_byte, pleft, 0, &
	649	ar(nys_l-nbgp_local,nxr_l+1), 1, &
	650	type_y_byte, pright, 0, &
	651	comm2d, status, ierr )
	652	!
	653	!-- Send right boundary, receive left one
	654	CALL MPI_SENDRECV( ar(nys_l-nbgp_local,nxr_l+1-nbgp_local), 1, &
	655	type_y_byte, pright, 1, &
	656	ar(nys_l-nbgp_local,nxl_l-nbgp_local), 1, &
	657	type_y_byte, pleft, 1, &
	658	comm2d, status, ierr )
	659
	660	ENDIF
	661
	662	IF ( pdims(2) == 1 ) THEN
	663	!
	664	!-- One-dimensional decomposition along x, boundary values can be exchanged
	665	!-- within the PE memory
	666	ar(nys_l-nbgp_local:nys_l-1,:) = ar(nyn_l+1-nbgp_local:nyn_l,:)
	667	ar(nyn_l+1:nyn_l+nbgp_local,:) = ar(nys_l:nys_l-1+nbgp_local,:)
	668
	669
	670	ELSE
	671	!
	672	!-- Send front boundary, receive rear one
	673	CALL MPI_SENDRECV( ar(nys_l,nxl_l-nbgp_local), 1, &
	674	type_x_byte, psouth, 0, &
	675	ar(nyn_l+1,nxl_l-nbgp_local), 1, &
	676	type_x_byte, pnorth, 0, &
	677	comm2d, status, ierr )
	678
	679	!
	680	!-- Send rear boundary, receive front one
	681	CALL MPI_SENDRECV( ar(nyn_l+1-nbgp_local,nxl_l-nbgp_local), 1, &
	682	type_x_byte, pnorth, 1, &
	683	ar(nys_l-nbgp_local,nxl_l-nbgp_local), 1, &
	684	type_x_byte, psouth, 1, &
	685	comm2d, status, ierr )
	686
	687	ENDIF
	688
	689	#else
	690
	691	!
	692	!-- Lateral boundary conditions in the non-parallel case
	693	IF ( bc_lr_cyc ) THEN
	694	ar(:,nxl_l-nbgp_local:nxl_l-1) = ar(:,nxr_l-nbgp_local+1:nxr_l)
	695	ar(:,nxr_l+1:nxr_l+nbgp_local) = ar(:,nxl_l:nxl_l+nbgp_local-1)
	696	ENDIF
	697
	698	IF ( bc_ns_cyc ) THEN
	699	ar(nys_l-nbgp_local:nys_l-1,:) = ar(nyn_l+1-nbgp_local:nyn_l,:)
	700	ar(nyn_l+1:nyn_l+nbgp_local,:) = ar(nys_l:nys_l-1+nbgp_local,:)
	701	ENDIF
	702
	703	#endif
	704	!
	705	!-- Neumann-conditions at inflow/outflow/nested boundaries
	706	IF ( bc_dirichlet_l .OR. bc_radiation_l ) THEN
	707	DO i = nbgp_local, 1, -1
	708	ar(:,nxl_l-i) = ar(:,nxl_l)
	709	ENDDO
	710	ENDIF
	711	IF ( bc_dirichlet_r .OR. bc_radiation_r ) THEN
	712	DO i = 1, nbgp_local
	713	ar(:,nxr_l+i) = ar(:,nxr_l)
	714	ENDDO
	715	ENDIF
	716	IF ( bc_dirichlet_s .OR. bc_radiation_s ) THEN
	717	DO i = nbgp_local, 1, -1
	718	ar(nys_l-i,:) = ar(nys_l,:)
	719	ENDDO
	720	ENDIF
	721	IF ( bc_dirichlet_n .OR. bc_radiation_n ) THEN
	722	DO i = 1, nbgp_local
	723	ar(nyn_l+i,:) = ar(nyn_l,:)
	724	ENDDO
	725	ENDIF
	726
	727	CALL cpu_log( log_point_s(13), 'exchange_horiz_2d', 'stop' )
	728
	729	END SUBROUTINE exchange_horiz_2d_byte
	730
	731
	732	!------------------------------------------------------------------------------!
	733	! Description:
	734	! ------------
	735	!> Exchange of lateral (ghost) boundaries (parallel computers) and cyclic
	736	!> boundary conditions, respectively, for 2D 32-bit integer arrays.
	737	!------------------------------------------------------------------------------!
	738	SUBROUTINE exchange_horiz_2d_int( ar, nys_l, nyn_l, nxl_l, nxr_l, nbgp_local )
	739
	740
	741	USE control_parameters, &
	742	ONLY: bc_dirichlet_l, bc_dirichlet_n, bc_dirichlet_r, bc_dirichlet_s, &
	743	bc_radiation_l, bc_radiation_n, bc_radiation_r, bc_radiation_s, &
	744	bc_radiation_l, bc_radiation_n, bc_radiation_r, bc_radiation_s
	745
	746	#if defined( __parallel )
	747	USE control_parameters, &
	748	ONLY: grid_level
	749	#endif
	750
	751	USE cpulog, &
	752	ONLY: cpu_log, log_point_s
	753
	754	#if ! defined( __parallel )
	755	USE control_parameters, &
	756	ONLY: bc_lr_cyc, bc_ns_cyc
	757	#endif
	758
	759	INTEGER(iwp) :: i !< dummy index to zero-gradient conditions at in/outflow boundaries
	760	INTEGER(iwp) :: nxl_l !< local index bound at current grid level, left side
	761	INTEGER(iwp) :: nxr_l !< local index bound at current grid level, right side
	762	INTEGER(iwp) :: nyn_l !< local index bound at current grid level, north side
	763	INTEGER(iwp) :: nys_l !< local index bound at current grid level, south side
	764	INTEGER(iwp) :: nbgp_local !< number of ghost layers to be exchanged
	765
	766	INTEGER(iwp), DIMENSION(nys_l-nbgp_local:nyn_l+nbgp_local, &
	767	nxl_l-nbgp_local:nxr_l+nbgp_local) :: ar !< treated array
	768
	769	CALL cpu_log( log_point_s(13), 'exchange_horiz_2d', 'start' )
	770
	771	#if defined( __parallel )
	772
	773	!
	774	!-- Exchange of lateral boundary values for parallel computers
	775	IF ( pdims(1) == 1 ) THEN
	776
	777	!
	778	!-- One-dimensional decomposition along y, boundary values can be exchanged
	779	!-- within the PE memory
	780	ar(:,nxl_l-nbgp_local:nxl_l-1) = ar(:,nxr_l-nbgp_local+1:nxr_l)
	781	ar(:,nxr_l+1:nxr_l+nbgp_local) = ar(:,nxl_l:nxl_l+nbgp_local-1)
	782
	783	ELSE
	784	!
	785	!-- Send left boundary, receive right one
	786	CALL MPI_SENDRECV( ar(nys_l-nbgp_local,nxl_l), 1, &
	787	type_y_int(grid_level), pleft, 0, &
	788	ar(nys_l-nbgp_local,nxr_l+1), 1, &
	789	type_y_int(grid_level), pright, 0, &
	790	comm2d, status, ierr )
	791	!
	792	!-- Send right boundary, receive left one
	793	CALL MPI_SENDRECV( ar(nys_l-nbgp_local,nxr_l+1-nbgp_local), 1, &
	794	type_y_int(grid_level), pright, 1, &
	795	ar(nys_l-nbgp_local,nxl_l-nbgp_local), 1, &
	796	type_y_int(grid_level), pleft, 1, &
	797	comm2d, status, ierr )
	798
	799	ENDIF
	800
	801	IF ( pdims(2) == 1 ) THEN
	802	!
	803	!-- One-dimensional decomposition along x, boundary values can be exchanged
	804	!-- within the PE memory
	805	ar(nys_l-nbgp_local:nys_l-1,:) = ar(nyn_l+1-nbgp_local:nyn_l,:)
	806	ar(nyn_l+1:nyn_l+nbgp_local,:) = ar(nys_l:nys_l-1+nbgp_local,:)
	807
	808
	809	ELSE
	810	!
	811	!-- Send front boundary, receive rear one
	812	CALL MPI_SENDRECV( ar(nys_l,nxl_l-nbgp_local), 1, &
	813	type_x_int(grid_level), psouth, 0, &
	814	ar(nyn_l+1,nxl_l-nbgp_local), 1, &
	815	type_x_int(grid_level), pnorth, 0, &
	816	comm2d, status, ierr )
	817
	818	!
	819	!-- Send rear boundary, receive front one
	820	CALL MPI_SENDRECV( ar(nyn_l+1-nbgp_local,nxl_l-nbgp_local), 1, &
	821	type_x_int(grid_level), pnorth, 1, &
	822	ar(nys_l-nbgp_local,nxl_l-nbgp_local), 1, &
	823	type_x_int(grid_level), psouth, 1, &
	824	comm2d, status, ierr )
	825
	826	ENDIF
	827
	828	#else
	829
	830	!
	831	!-- Lateral boundary conditions in the non-parallel case
	832	IF ( bc_lr_cyc ) THEN
	833	ar(:,nxl_l-nbgp_local:nxl_l-1) = ar(:,nxr_l-nbgp_local+1:nxr_l)
	834	ar(:,nxr_l+1:nxr_l+nbgp_local) = ar(:,nxl_l:nxl_l+nbgp_local-1)
	835	ENDIF
	836
	837	IF ( bc_ns_cyc ) THEN
	838	ar(nys_l-nbgp_local:nys_l-1,:) = ar(nyn_l+1-nbgp_local:nyn_l,:)
	839	ar(nyn_l+1:nyn_l+nbgp_local,:) = ar(nys_l:nys_l-1+nbgp_local,:)
	840	ENDIF
	841
	842	#endif
	843	!
	844	!-- Neumann-conditions at inflow/outflow/nested boundaries
	845	IF ( bc_dirichlet_l .OR. bc_radiation_l ) THEN
	846	DO i = nbgp_local, 1, -1
	847	ar(:,nxl_l-i) = ar(:,nxl_l)
	848	ENDDO
	849	ENDIF
	850	IF ( bc_dirichlet_r .OR. bc_radiation_r ) THEN
	851	DO i = 1, nbgp_local
	852	ar(:,nxr_l+i) = ar(:,nxr_l)
	853	ENDDO
	854	ENDIF
	855	IF ( bc_dirichlet_s .OR. bc_radiation_s ) THEN
	856	DO i = nbgp_local, 1, -1
	857	ar(nys_l-i,:) = ar(nys_l,:)
	858	ENDDO
	859	ENDIF
	860	IF ( bc_dirichlet_n .OR. bc_radiation_n ) THEN
	861	DO i = 1, nbgp_local
	862	ar(nyn_l+i,:) = ar(nyn_l,:)
	863	ENDDO
	864	ENDIF
	865
	866	CALL cpu_log( log_point_s(13), 'exchange_horiz_2d', 'stop' )
	867
	868	END SUBROUTINE exchange_horiz_2d_int
	869
	870
	871	END MODULE exchange_horiz_mod

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