| 1 | SUBROUTINE exchange_horiz( ar, nbgp_local) |
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| 2 | |
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| 3 | !------------------------------------------------------------------------------! |
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| 4 | ! This file is part of PALM. |
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| 5 | ! |
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| 6 | ! PALM is free software: you can redistribute it and/or modify it under the terms |
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| 7 | ! of the GNU General Public License as published by the Free Software Foundation, |
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| 8 | ! either version 3 of the License, or (at your option) any later version. |
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| 9 | ! |
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| 10 | ! PALM is distributed in the hope that it will be useful, but WITHOUT ANY |
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| 11 | ! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR |
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| 12 | ! A PARTICULAR PURPOSE. See the GNU General Public License for more details. |
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| 13 | ! |
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| 14 | ! You should have received a copy of the GNU General Public License along with |
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| 15 | ! PALM. If not, see <http://www.gnu.org/licenses/>. |
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| 16 | ! |
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| 17 | ! Copyright 1997-2014 Leibniz Universitaet Hannover |
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| 18 | !------------------------------------------------------------------------------! |
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| 19 | ! |
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| 20 | ! Current revisions: |
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| 21 | ! ----------------- |
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| 22 | ! ONLY-attribute added to USE-statements, |
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| 23 | ! kind-parameters added to all INTEGER and REAL declaration statements, |
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| 24 | ! kinds are defined in new module kinds, |
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| 25 | ! old module precision_kind is removed, |
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| 26 | ! revision history before 2012 removed, |
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| 27 | ! comment fields (!:) to be used for variable explanations added to |
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| 28 | ! all variable declaration statements |
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| 29 | ! |
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| 30 | ! Former revisions: |
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| 31 | ! ----------------- |
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| 32 | ! $Id: exchange_horiz.f90 1320 2014-03-20 08:40:49Z raasch $ |
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| 33 | ! |
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| 34 | ! 1257 2013-11-08 15:18:40Z raasch |
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| 35 | ! openacc loop and loop vector clauses removed |
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| 36 | ! |
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| 37 | ! 1128 2013-04-12 06:19:32Z raasch |
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| 38 | ! modifications for asynchronous transfer, |
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| 39 | ! local variables req, wait_stat are global now, and have been moved to module |
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| 40 | ! pegrid |
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| 41 | ! |
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| 42 | ! 1113 2013-03-10 02:48:14Z raasch |
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| 43 | ! GPU-porting for single-core (1PE) mode |
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| 44 | ! |
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| 45 | ! 1036 2012-10-22 13:43:42Z raasch |
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| 46 | ! code put under GPL (PALM 3.9) |
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| 47 | ! |
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| 48 | ! 841 2012-02-28 12:29:49Z maronga |
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| 49 | ! Excluded routine from compilation of namelist_file_check |
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| 50 | ! |
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| 51 | ! Revision 1.1 1997/07/24 11:13:29 raasch |
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| 52 | ! Initial revision |
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| 53 | ! |
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| 54 | ! |
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| 55 | ! Description: |
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| 56 | ! ------------ |
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| 57 | ! Exchange of lateral boundary values (parallel computers) and cyclic |
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| 58 | ! lateral boundary conditions, respectively. |
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| 59 | !------------------------------------------------------------------------------! |
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| 60 | |
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| 61 | USE control_parameters, & |
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| 62 | ONLY: bc_lr_cyc, bc_ns_cyc, grid_level, mg_switch_to_pe0, & |
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| 63 | synchronous_exchange |
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| 64 | |
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| 65 | USE cpulog, & |
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| 66 | ONLY: cpu_log, log_point_s |
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| 67 | |
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| 68 | USE indices, & |
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| 69 | ONLY: nxl, nxr, nyn, nys, nzb, nzt |
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| 70 | |
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| 71 | USE kinds |
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| 72 | |
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| 73 | USE pegrid |
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| 74 | |
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| 75 | IMPLICIT NONE |
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| 76 | |
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| 77 | |
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| 78 | INTEGER(iwp) :: i !: |
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| 79 | INTEGER(iwp) :: j !: |
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| 80 | INTEGER(iwp) :: k !: |
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| 81 | INTEGER(iwp) :: nbgp_local !: |
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| 82 | |
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| 83 | REAL(wp), DIMENSION(nzb:nzt+1,nys-nbgp_local:nyn+nbgp_local, & |
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| 84 | nxl-nbgp_local:nxr+nbgp_local) :: ar !: |
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| 85 | |
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| 86 | |
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| 87 | #if ! defined( __check ) |
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| 88 | |
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| 89 | CALL cpu_log( log_point_s(2), 'exchange_horiz', 'start' ) |
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| 90 | |
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| 91 | #if defined( __parallel ) |
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| 92 | |
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| 93 | ! |
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| 94 | !-- Exchange in x-direction of lateral boundaries |
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| 95 | IF ( pdims(1) == 1 .OR. mg_switch_to_pe0 ) THEN |
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| 96 | ! |
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| 97 | !-- One-dimensional decomposition along y, boundary values can be exchanged |
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| 98 | !-- within the PE memory |
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| 99 | IF ( bc_lr_cyc ) THEN |
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| 100 | ar(:,:,nxl-nbgp_local:nxl-1) = ar(:,:,nxr-nbgp_local+1:nxr) |
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| 101 | ar(:,:,nxr+1:nxr+nbgp_local) = ar(:,:,nxl:nxl+nbgp_local-1) |
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| 102 | ENDIF |
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| 103 | |
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| 104 | ELSE |
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| 105 | |
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| 106 | IF ( synchronous_exchange ) THEN |
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| 107 | ! |
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| 108 | !-- Send left boundary, receive right one (synchronous) |
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| 109 | CALL MPI_SENDRECV( & |
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| 110 | ar(nzb,nys-nbgp_local,nxl), 1, type_yz(grid_level), pleft, 0, & |
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| 111 | ar(nzb,nys-nbgp_local,nxr+1), 1, type_yz(grid_level), pright, 0, & |
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| 112 | comm2d, status, ierr ) |
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| 113 | ! |
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| 114 | !-- Send right boundary, receive left one (synchronous) |
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| 115 | CALL MPI_SENDRECV( ar(nzb,nys-nbgp_local,nxr+1-nbgp_local), 1, & |
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| 116 | type_yz(grid_level), pright, 1, & |
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| 117 | ar(nzb,nys-nbgp_local,nxl-nbgp_local), 1, & |
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| 118 | type_yz(grid_level), pleft, 1, & |
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| 119 | comm2d, status, ierr ) |
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| 120 | |
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| 121 | ELSE |
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| 122 | |
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| 123 | ! |
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| 124 | !-- In case of background communication switched on, exchange is done |
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| 125 | !-- either along x or along y |
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| 126 | IF ( send_receive == 'lr' .OR. send_receive == 'al' ) THEN |
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| 127 | |
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| 128 | IF ( .NOT. sendrecv_in_background ) THEN |
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| 129 | req(1:4) = 0 |
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| 130 | req_count = 0 |
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| 131 | ENDIF |
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| 132 | ! |
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| 133 | !-- Send left boundary, receive right one (asynchronous) |
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| 134 | CALL MPI_ISEND( ar(nzb,nys-nbgp_local,nxl), 1, type_yz(grid_level), & |
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| 135 | pleft, req_count, comm2d, req(req_count+1), ierr ) |
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| 136 | CALL MPI_IRECV( ar(nzb,nys-nbgp_local,nxr+1), 1, type_yz(grid_level), & |
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| 137 | pright, req_count, comm2d, req(req_count+2), ierr ) |
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| 138 | ! |
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| 139 | !-- Send right boundary, receive left one (asynchronous) |
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| 140 | CALL MPI_ISEND( ar(nzb,nys-nbgp_local,nxr+1-nbgp_local), 1, & |
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| 141 | type_yz(grid_level), pright, req_count+1, comm2d, & |
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| 142 | req(req_count+3), ierr ) |
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| 143 | CALL MPI_IRECV( ar(nzb,nys-nbgp_local,nxl-nbgp_local), 1, & |
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| 144 | type_yz(grid_level), pleft, req_count+1, comm2d, & |
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| 145 | req(req_count+4), ierr ) |
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| 146 | |
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| 147 | IF ( .NOT. sendrecv_in_background ) THEN |
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| 148 | CALL MPI_WAITALL( 4, req, wait_stat, ierr ) |
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| 149 | ELSE |
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| 150 | req_count = req_count + 4 |
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| 151 | ENDIF |
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| 152 | |
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| 153 | ENDIF |
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| 154 | |
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| 155 | ENDIF |
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| 156 | |
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| 157 | ENDIF |
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| 158 | |
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| 159 | |
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| 160 | IF ( pdims(2) == 1 .OR. mg_switch_to_pe0 ) THEN |
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| 161 | ! |
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| 162 | !-- One-dimensional decomposition along x, boundary values can be exchanged |
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| 163 | !-- within the PE memory |
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| 164 | IF ( bc_ns_cyc ) THEN |
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| 165 | ar(:,nys-nbgp_local:nys-1,:) = ar(:,nyn-nbgp_local+1:nyn,:) |
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| 166 | ar(:,nyn+1:nyn+nbgp_local,:) = ar(:,nys:nys+nbgp_local-1,:) |
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| 167 | ENDIF |
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| 168 | |
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| 169 | ELSE |
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| 170 | |
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| 171 | IF ( synchronous_exchange ) THEN |
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| 172 | ! |
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| 173 | !-- Send front boundary, receive rear one (synchronous) |
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| 174 | CALL MPI_SENDRECV( & |
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| 175 | ar(nzb,nys,nxl-nbgp_local), 1, type_xz(grid_level), psouth, 0, & |
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| 176 | ar(nzb,nyn+1,nxl-nbgp_local), 1, type_xz(grid_level), pnorth, 0, & |
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| 177 | comm2d, status, ierr ) |
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| 178 | ! |
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| 179 | !-- Send rear boundary, receive front one (synchronous) |
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| 180 | CALL MPI_SENDRECV( ar(nzb,nyn-nbgp_local+1,nxl-nbgp_local), 1, & |
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| 181 | type_xz(grid_level), pnorth, 1, & |
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| 182 | ar(nzb,nys-nbgp_local,nxl-nbgp_local), 1, & |
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| 183 | type_xz(grid_level), psouth, 1, & |
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| 184 | comm2d, status, ierr ) |
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| 185 | |
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| 186 | ELSE |
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| 187 | |
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| 188 | ! |
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| 189 | !-- In case of background communication switched on, exchange is done |
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| 190 | !-- either along x or along y |
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| 191 | IF ( send_receive == 'lr' .OR. send_receive == 'al' ) THEN |
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| 192 | |
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| 193 | IF ( .NOT. sendrecv_in_background ) THEN |
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| 194 | req(1:4) = 0 |
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| 195 | req_count = 0 |
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| 196 | ENDIF |
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| 197 | |
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| 198 | ! |
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| 199 | !-- Send front boundary, receive rear one (asynchronous) |
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| 200 | CALL MPI_ISEND( ar(nzb,nys,nxl-nbgp_local), 1, type_xz(grid_level), & |
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| 201 | psouth, req_count, comm2d, req(req_count+1), ierr ) |
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| 202 | CALL MPI_IRECV( ar(nzb,nyn+1,nxl-nbgp_local), 1, type_xz(grid_level), & |
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| 203 | pnorth, req_count, comm2d, req(req_count+2), ierr ) |
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| 204 | ! |
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| 205 | !-- Send rear boundary, receive front one (asynchronous) |
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| 206 | CALL MPI_ISEND( ar(nzb,nyn-nbgp_local+1,nxl-nbgp_local), 1, & |
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| 207 | type_xz(grid_level), pnorth, req_count+1, comm2d, & |
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| 208 | req(req_count+3), ierr ) |
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| 209 | CALL MPI_IRECV( ar(nzb,nys-nbgp_local,nxl-nbgp_local), 1, & |
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| 210 | type_xz(grid_level), psouth, req_count+1, comm2d, & |
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| 211 | req(req_count+4), ierr ) |
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| 212 | |
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| 213 | IF ( .NOT. sendrecv_in_background ) THEN |
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| 214 | CALL MPI_WAITALL( 4, req, wait_stat, ierr ) |
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| 215 | ELSE |
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| 216 | req_count = req_count + 4 |
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| 217 | ENDIF |
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| 218 | |
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| 219 | ENDIF |
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| 220 | |
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| 221 | ENDIF |
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| 222 | |
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| 223 | ENDIF |
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| 224 | |
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| 225 | #else |
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| 226 | |
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| 227 | ! |
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| 228 | !-- Lateral boundary conditions in the non-parallel case. |
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| 229 | !-- Case dependent, because in GPU mode still not all arrays are on device. This |
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| 230 | !-- workaround has to be removed later. Also, since PGI compiler 12.5 has problems |
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| 231 | !-- with array syntax, explicit loops are used. |
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| 232 | IF ( bc_lr == 'cyclic' ) THEN |
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| 233 | IF ( on_device ) THEN |
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| 234 | !$acc kernels present( ar ) |
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| 235 | !$acc loop independent |
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| 236 | DO i = 0, nbgp_local-1 |
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| 237 | DO j = nys-nbgp_local, nyn+nbgp_local |
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| 238 | DO k = nzb, nzt+1 |
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| 239 | ar(k,j,nxl-nbgp_local+i) = ar(k,j,nxr-nbgp_local+1+i) |
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| 240 | ar(k,j,nxr+1+i) = ar(k,j,nxl+i) |
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| 241 | ENDDO |
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| 242 | ENDDO |
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| 243 | ENDDO |
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| 244 | !$acc end kernels |
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| 245 | ELSE |
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| 246 | ar(:,:,nxl-nbgp_local:nxl-1) = ar(:,:,nxr-nbgp_local+1:nxr) |
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| 247 | ar(:,:,nxr+1:nxr+nbgp_local) = ar(:,:,nxl:nxl+nbgp_local-1) |
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| 248 | ENDIF |
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| 249 | ENDIF |
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| 250 | |
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| 251 | IF ( bc_ns == 'cyclic' ) THEN |
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| 252 | IF ( on_device ) THEN |
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| 253 | !$acc kernels present( ar ) |
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| 254 | DO i = nxl-nbgp_local, nxr+nbgp_local |
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| 255 | !$acc loop independent |
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| 256 | DO j = 0, nbgp_local-1 |
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| 257 | !$acc loop independent |
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| 258 | DO k = nzb, nzt+1 |
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| 259 | ar(k,nys-nbgp_local+j,i) = ar(k,nyn-nbgp_local+1+j,i) |
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| 260 | ar(k,nyn+1+j,i) = ar(k,nys+j,i) |
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| 261 | ENDDO |
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| 262 | ENDDO |
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| 263 | ENDDO |
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| 264 | !$acc end kernels |
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| 265 | ELSE |
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| 266 | ar(:,nys-nbgp_local:nys-1,:) = ar(:,nyn-nbgp_local+1:nyn,:) |
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| 267 | ar(:,nyn+1:nyn+nbgp_local,:) = ar(:,nys:nys+nbgp_local-1,:) |
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| 268 | ENDIF |
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| 269 | ENDIF |
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| 270 | |
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| 271 | #endif |
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| 272 | CALL cpu_log( log_point_s(2), 'exchange_horiz', 'stop' ) |
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| 273 | |
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| 274 | #endif |
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| 275 | END SUBROUTINE exchange_horiz |
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