| 1 | !> @file global_min_max.f90 |
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| 2 | !------------------------------------------------------------------------------! |
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| 3 | ! This file is part of the PALM model system. |
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| 4 | ! |
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| 5 | ! PALM is free software: you can redistribute it and/or modify it under the |
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| 6 | ! terms of the GNU General Public License as published by the Free Software |
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| 7 | ! Foundation, either version 3 of the License, or (at your option) any later |
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| 8 | ! 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 1997-2019 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 | ! |
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| 23 | ! |
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| 24 | ! Former revisions: |
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| 25 | ! ----------------- |
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| 26 | ! $Id: global_min_max.f90 4233 2019-09-20 09:55:54Z resler $ |
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| 27 | ! OpenACC support added |
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| 28 | ! |
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| 29 | ! 4182 2019-08-22 15:20:23Z scharf |
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| 30 | ! Corrected "Former revisions" section |
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| 31 | ! |
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| 32 | ! 3655 2019-01-07 16:51:22Z knoop |
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| 33 | ! Corrected "Former revisions" section |
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| 34 | ! |
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| 35 | ! Revision 1.1 1997/07/24 11:14:03 raasch |
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| 36 | ! Initial revision |
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| 37 | ! |
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| 38 | ! |
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| 39 | ! Description: |
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| 40 | ! ------------ |
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| 41 | !> Determine the array minimum/maximum and the corresponding indices. |
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| 42 | !------------------------------------------------------------------------------! |
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| 43 | SUBROUTINE global_min_max( i1, i2, j1, j2, k1, k2, ar, mode, offset, value, & |
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| 44 | value_ijk, value1, value1_ijk ) |
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| 45 | |
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| 46 | |
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| 47 | USE indices, & |
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| 48 | ONLY: nbgp, ny, nx |
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| 49 | |
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| 50 | USE kinds |
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| 51 | |
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| 52 | USE pegrid |
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| 53 | |
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| 54 | IMPLICIT NONE |
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| 55 | |
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| 56 | CHARACTER (LEN=*) :: mode !< |
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| 57 | |
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| 58 | INTEGER(iwp) :: i !< |
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| 59 | INTEGER(iwp) :: i1 !< |
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| 60 | INTEGER(iwp) :: i2 !< |
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| 61 | INTEGER(iwp) :: id_fmax !< |
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| 62 | INTEGER(iwp) :: id_fmin !< |
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| 63 | INTEGER(iwp) :: j !< |
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| 64 | INTEGER(iwp) :: j1 !< |
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| 65 | INTEGER(iwp) :: j2 !< |
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| 66 | INTEGER(iwp) :: k !< |
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| 67 | INTEGER(iwp) :: k1 !< |
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| 68 | INTEGER(iwp) :: k2 !< |
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| 69 | INTEGER(iwp) :: fmax_ijk(3) !< |
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| 70 | INTEGER(iwp) :: fmax_ijk_l(3) !< |
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| 71 | INTEGER(iwp) :: fmin_ijk(3) !< |
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| 72 | INTEGER(iwp) :: fmin_ijk_l(3) !< |
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| 73 | INTEGER(iwp) :: value_ijk(3) !< |
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| 74 | |
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| 75 | INTEGER(iwp), OPTIONAL :: value1_ijk(3) !< |
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| 76 | |
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| 77 | REAL(wp) :: offset !< |
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| 78 | REAL(wp) :: value !< |
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| 79 | REAL(wp) :: ar(i1:i2,j1:j2,k1:k2) !< |
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| 80 | |
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| 81 | #if defined( __ibm ) |
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| 82 | REAL(sp) :: fmax(2) !< |
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| 83 | REAL(sp) :: fmax_l(2) !< |
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| 84 | REAL(sp) :: fmin(2) !< |
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| 85 | REAL(sp) :: fmin_l(2) !< |
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| 86 | ! on 32bit-machines MPI_2REAL must not be replaced |
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| 87 | ! by MPI_2DOUBLE_PRECISION |
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| 88 | #else |
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| 89 | REAL(wp) :: fmax(2) !< |
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| 90 | REAL(wp) :: fmax_l(2) !< |
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| 91 | REAL(wp) :: fmin(2) !< |
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| 92 | REAL(wp) :: fmin_l(2) !< |
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| 93 | #endif |
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| 94 | #if defined( _OPENACC ) |
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| 95 | REAL(wp) :: red !< scalar for reduction with OpenACC |
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| 96 | INTEGER(iwp) :: count_eq !< counter for locations of maximum |
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| 97 | #endif |
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| 98 | REAL(wp), OPTIONAL :: value1 !< |
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| 99 | |
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| 100 | |
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| 101 | ! |
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| 102 | !-- Determine array minimum |
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| 103 | IF ( mode == 'min' .OR. mode == 'minmax' ) THEN |
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| 104 | |
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| 105 | ! |
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| 106 | !-- Determine the local minimum |
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| 107 | fmin_ijk_l = MINLOC( ar ) |
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| 108 | fmin_ijk_l(1) = i1 + fmin_ijk_l(1) - 1 ! MINLOC assumes lowerbound = 1 |
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| 109 | fmin_ijk_l(2) = j1 + fmin_ijk_l(2) - nbgp |
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| 110 | fmin_ijk_l(3) = k1 + fmin_ijk_l(3) - nbgp |
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| 111 | fmin_l(1) = ar(fmin_ijk_l(1),fmin_ijk_l(2),fmin_ijk_l(3)) |
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| 112 | |
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| 113 | #if defined( __parallel ) |
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| 114 | fmin_l(2) = myid |
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| 115 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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| 116 | CALL MPI_ALLREDUCE( fmin_l, fmin, 1, MPI_2REAL, MPI_MINLOC, comm2d, & |
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| 117 | ierr ) |
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| 118 | |
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| 119 | ! |
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| 120 | !-- Determine the global minimum. Result stored on PE0. |
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| 121 | id_fmin = fmin(2) |
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| 122 | IF ( id_fmin /= 0 ) THEN |
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| 123 | IF ( myid == 0 ) THEN |
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| 124 | CALL MPI_RECV( fmin_ijk, 3, MPI_INTEGER, id_fmin, 0, comm2d, & |
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| 125 | status, ierr ) |
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| 126 | ELSEIF ( myid == id_fmin ) THEN |
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| 127 | CALL MPI_SEND( fmin_ijk_l, 3, MPI_INTEGER, 0, 0, comm2d, ierr ) |
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| 128 | ENDIF |
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| 129 | ELSE |
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| 130 | fmin_ijk = fmin_ijk_l |
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| 131 | ENDIF |
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| 132 | ! |
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| 133 | !-- Send the indices of the just determined array minimum to other PEs |
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| 134 | CALL MPI_BCAST( fmin_ijk, 3, MPI_INTEGER, 0, comm2d, ierr ) |
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| 135 | #else |
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| 136 | fmin(1) = fmin_l(1) |
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| 137 | fmin_ijk = fmin_ijk_l |
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| 138 | #endif |
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| 139 | |
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| 140 | ENDIF |
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| 141 | |
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| 142 | ! |
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| 143 | !-- Determine array maximum |
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| 144 | IF ( mode == 'max' .OR. mode == 'minmax' ) THEN |
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| 145 | |
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| 146 | ! |
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| 147 | !-- Determine the local maximum |
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| 148 | fmax_ijk_l = MAXLOC( ar ) |
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| 149 | fmax_ijk_l(1) = i1 + fmax_ijk_l(1) - 1 ! MAXLOC assumes lowerbound = 1 |
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| 150 | fmax_ijk_l(2) = j1 + fmax_ijk_l(2) - nbgp |
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| 151 | fmax_ijk_l(3) = k1 + fmax_ijk_l(3) - nbgp |
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| 152 | fmax_l(1) = ar(fmax_ijk_l(1),fmax_ijk_l(2),fmax_ijk_l(3)) |
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| 153 | |
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| 154 | #if defined( __parallel ) |
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| 155 | fmax_l(2) = myid |
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| 156 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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| 157 | CALL MPI_ALLREDUCE( fmax_l, fmax, 1, MPI_2REAL, MPI_MAXLOC, comm2d, & |
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| 158 | ierr ) |
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| 159 | |
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| 160 | ! |
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| 161 | !-- Determine the global maximum. Result stored on PE0. |
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| 162 | id_fmax = fmax(2) |
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| 163 | IF ( id_fmax /= 0 ) THEN |
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| 164 | IF ( myid == 0 ) THEN |
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| 165 | CALL MPI_RECV( fmax_ijk, 3, MPI_INTEGER, id_fmax, 0, comm2d, & |
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| 166 | status, ierr ) |
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| 167 | ELSEIF ( myid == id_fmax ) THEN |
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| 168 | CALL MPI_SEND( fmax_ijk_l, 3, MPI_INTEGER, 0, 0, comm2d, ierr ) |
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| 169 | ENDIF |
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| 170 | ELSE |
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| 171 | fmax_ijk = fmax_ijk_l |
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| 172 | ENDIF |
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| 173 | ! |
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| 174 | !-- send the indices of the just determined array maximum to other PEs |
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| 175 | CALL MPI_BCAST( fmax_ijk, 3, MPI_INTEGER, 0, comm2d, ierr ) |
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| 176 | #else |
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| 177 | fmax(1) = fmax_l(1) |
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| 178 | fmax_ijk = fmax_ijk_l |
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| 179 | #endif |
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| 180 | |
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| 181 | ENDIF |
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| 182 | |
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| 183 | ! |
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| 184 | !-- Determine absolute array maximum |
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| 185 | IF ( mode == 'abs' ) THEN |
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| 186 | |
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| 187 | #if defined( _OPENACC ) |
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| 188 | red = 0.0_wp |
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| 189 | !$ACC PARALLEL LOOP COLLAPSE(3) PRIVATE(i, j, k) & |
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| 190 | !$ACC PRESENT(ar) COPY(red) REDUCTION(MAX: red) |
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| 191 | DO k = k1, k2 |
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| 192 | DO j = j1, j2 |
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| 193 | DO i = i1, i2 |
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| 194 | IF ( ABS( ar(i,j,k) ) > red ) THEN |
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| 195 | red = ABS( ar(i,j,k) ) |
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| 196 | ENDIF |
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| 197 | ENDDO |
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| 198 | ENDDO |
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| 199 | ENDDO |
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| 200 | fmax_l(1) = red |
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| 201 | |
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| 202 | ! |
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| 203 | !-- Determine the maximum's position and count how often it is found. |
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| 204 | count_eq = 0 |
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| 205 | !$ACC PARALLEL LOOP COLLAPSE(3) PRIVATE(i, j, k) & |
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| 206 | !$ACC PRESENT(ar) COPY(fmax_ijk_l(1:3), count_eq) & |
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| 207 | !$ACC REDUCTION(+:count_eq) |
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| 208 | DO k = k1, k2 |
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| 209 | DO j = j1, j2 |
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| 210 | DO i = i1, i2 |
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| 211 | IF ( ABS( ar(i,j,k) ) == red ) THEN |
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| 212 | fmax_ijk_l(1) = i |
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| 213 | fmax_ijk_l(2) = j |
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| 214 | fmax_ijk_l(3) = k |
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| 215 | count_eq = count_eq + 1 |
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| 216 | ENDIF |
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| 217 | ENDDO |
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| 218 | ENDDO |
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| 219 | ENDDO |
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| 220 | |
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| 221 | IF ( count_eq == 1 ) THEN |
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| 222 | ! |
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| 223 | !-- We found a single maximum element and correctly got its position. Transfer its |
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| 224 | !-- value to handle the negative case correctly. |
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| 225 | !$ACC UPDATE HOST(ar(fmax_ijk_l(1):fmax_ijk_l(1),fmax_ijk_l(2),fmax_ijk_l(3))) |
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| 226 | ELSE |
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| 227 | ! |
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| 228 | !-- We found no maximum element (?) or multiple, so the position is not correct. |
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| 229 | !-- Copy the full array to the host and determine the maximum sequentially... |
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| 230 | !$ACC UPDATE HOST(ar(i1:i2,j1:j2,k1:k2)) |
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| 231 | #endif |
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| 232 | |
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| 233 | ! |
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| 234 | !-- Determine the local absolut maximum |
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| 235 | fmax_l(1) = 0.0_wp |
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| 236 | fmax_ijk_l(1) = i1 |
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| 237 | fmax_ijk_l(2) = j1 |
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| 238 | fmax_ijk_l(3) = k1 |
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| 239 | DO k = k1, k2 |
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| 240 | DO j = j1, j2 |
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| 241 | DO i = i1, i2 |
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| 242 | IF ( ABS( ar(i,j,k) ) > fmax_l(1) ) THEN |
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| 243 | fmax_l(1) = ABS( ar(i,j,k) ) |
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| 244 | fmax_ijk_l(1) = i |
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| 245 | fmax_ijk_l(2) = j |
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| 246 | fmax_ijk_l(3) = k |
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| 247 | ENDIF |
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| 248 | ENDDO |
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| 249 | ENDDO |
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| 250 | ENDDO |
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| 251 | |
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| 252 | #if defined( _OPENACC ) |
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| 253 | ! |
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| 254 | !-- Close ELSE case from above |
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| 255 | ENDIF |
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| 256 | #endif |
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| 257 | |
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| 258 | ! |
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| 259 | !-- Set a flag in case that the determined value is negative. |
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| 260 | !-- A constant offset has to be subtracted in order to handle the special |
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| 261 | !-- case i=0 correctly |
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| 262 | IF ( ar(fmax_ijk_l(1),fmax_ijk_l(2),fmax_ijk_l(3)) < 0.0_wp ) THEN |
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| 263 | fmax_ijk_l(1) = -fmax_ijk_l(1) - 10 |
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| 264 | ENDIF |
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| 265 | |
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| 266 | #if defined( __parallel ) |
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| 267 | fmax_l(2) = myid |
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| 268 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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| 269 | CALL MPI_ALLREDUCE( fmax_l, fmax, 1, MPI_2REAL, MPI_MAXLOC, comm2d, & |
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| 270 | ierr ) |
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| 271 | |
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| 272 | ! |
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| 273 | !-- Determine the global absolut maximum. Result stored on PE0. |
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| 274 | id_fmax = fmax(2) |
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| 275 | IF ( id_fmax /= 0 ) THEN |
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| 276 | IF ( myid == 0 ) THEN |
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| 277 | CALL MPI_RECV( fmax_ijk, 3, MPI_INTEGER, id_fmax, 0, comm2d, & |
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| 278 | status, ierr ) |
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| 279 | ELSEIF ( myid == id_fmax ) THEN |
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| 280 | CALL MPI_SEND( fmax_ijk_l, 3, MPI_INTEGER, 0, 0, comm2d, ierr ) |
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| 281 | ENDIF |
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| 282 | ELSE |
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| 283 | fmax_ijk = fmax_ijk_l |
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| 284 | ENDIF |
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| 285 | ! |
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| 286 | !-- Send the indices of the just determined absolut maximum to other PEs |
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| 287 | CALL MPI_BCAST( fmax_ijk, 3, MPI_INTEGER, 0, comm2d, ierr ) |
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| 288 | #else |
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| 289 | fmax(1) = fmax_l(1) |
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| 290 | fmax_ijk = fmax_ijk_l |
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| 291 | #endif |
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| 292 | |
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| 293 | ENDIF |
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| 294 | |
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| 295 | ! |
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| 296 | !-- Determine absolute maximum of ( array - offset ) |
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| 297 | IF ( mode == 'absoff' ) THEN |
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| 298 | |
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| 299 | ! |
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| 300 | !-- Determine the local absolut maximum |
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| 301 | fmax_l(1) = 0.0_wp |
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| 302 | fmax_ijk_l(1) = i1 |
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| 303 | fmax_ijk_l(2) = j1 |
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| 304 | fmax_ijk_l(3) = k1 |
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| 305 | DO k = k1, k2 |
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| 306 | DO j = j1, j2 |
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| 307 | ! |
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| 308 | !-- Attention: the lowest gridpoint is excluded here, because there |
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| 309 | !-- --------- is no advection at nzb=0 and mode 'absoff' is only |
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| 310 | !-- used for calculating u,v extrema for CFL-criteria |
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| 311 | DO i = i1+1, i2 |
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| 312 | IF ( ABS( ar(i,j,k) - offset ) > fmax_l(1) ) THEN |
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| 313 | fmax_l(1) = ABS( ar(i,j,k) - offset ) |
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| 314 | fmax_ijk_l(1) = i |
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| 315 | fmax_ijk_l(2) = j |
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| 316 | fmax_ijk_l(3) = k |
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| 317 | ENDIF |
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| 318 | ENDDO |
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| 319 | ENDDO |
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| 320 | ENDDO |
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| 321 | |
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| 322 | ! |
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| 323 | !-- Set a flag in case that the determined value is negative. |
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| 324 | !-- A constant offset has to be subtracted in order to handle the special |
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| 325 | !-- case i=0 correctly |
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| 326 | IF ( ar(fmax_ijk_l(1),fmax_ijk_l(2),fmax_ijk_l(3)) < 0.0_wp ) THEN |
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| 327 | fmax_ijk_l(1) = -fmax_ijk_l(1) - 10 |
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| 328 | ENDIF |
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| 329 | |
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| 330 | #if defined( __parallel ) |
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| 331 | fmax_l(2) = myid |
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| 332 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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| 333 | CALL MPI_ALLREDUCE( fmax_l, fmax, 1, MPI_2REAL, MPI_MAXLOC, comm2d, & |
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| 334 | ierr ) |
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| 335 | |
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| 336 | ! |
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| 337 | !-- Determine the global absolut maximum. Result stored on PE0. |
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| 338 | id_fmax = fmax(2) |
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| 339 | IF ( id_fmax /= 0 ) THEN |
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| 340 | IF ( myid == 0 ) THEN |
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| 341 | CALL MPI_RECV( fmax_ijk, 3, MPI_INTEGER, id_fmax, 0, comm2d, & |
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| 342 | status, ierr ) |
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| 343 | ELSEIF ( myid == id_fmax ) THEN |
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| 344 | CALL MPI_SEND( fmax_ijk_l, 3, MPI_INTEGER, 0, 0, comm2d, ierr ) |
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| 345 | ENDIF |
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| 346 | ELSE |
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| 347 | fmax_ijk = fmax_ijk_l |
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| 348 | ENDIF |
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| 349 | ! |
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| 350 | !-- Send the indices of the just determined absolut maximum to other PEs |
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| 351 | CALL MPI_BCAST( fmax_ijk, 3, MPI_INTEGER, 0, comm2d, ierr ) |
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| 352 | #else |
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| 353 | fmax(1) = fmax_l(1) |
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| 354 | fmax_ijk = fmax_ijk_l |
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| 355 | #endif |
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| 356 | |
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| 357 | ENDIF |
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| 358 | |
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| 359 | ! |
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| 360 | !-- Determine output parameters |
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| 361 | SELECT CASE( mode ) |
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| 362 | |
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| 363 | CASE( 'min' ) |
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| 364 | |
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| 365 | value = fmin(1) |
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| 366 | value_ijk = fmin_ijk |
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| 367 | |
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| 368 | CASE( 'max' ) |
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| 369 | |
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| 370 | value = fmax(1) |
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| 371 | value_ijk = fmax_ijk |
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| 372 | |
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| 373 | CASE( 'minmax' ) |
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| 374 | |
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| 375 | value = fmin(1) |
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| 376 | value_ijk = fmin_ijk |
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| 377 | value1 = fmax(1) |
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| 378 | value1_ijk = fmax_ijk |
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| 379 | |
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| 380 | CASE( 'abs', 'absoff' ) |
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| 381 | |
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| 382 | value = fmax(1) |
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| 383 | value_ijk = fmax_ijk |
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| 384 | IF ( fmax_ijk(1) < 0 ) THEN |
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| 385 | value = -value |
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| 386 | value_ijk(1) = -value_ijk(1) - 10 !??? |
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| 387 | ENDIF |
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| 388 | |
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| 389 | END SELECT |
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| 390 | |
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| 391 | ! |
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| 392 | !-- Limit index values to the range 0..nx, 0..ny |
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| 393 | IF ( value_ijk(3) < 0 ) value_ijk(3) = nx +1 + value_ijk(3) |
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| 394 | IF ( value_ijk(3) > nx ) value_ijk(3) = value_ijk(3) - (nx+1) |
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| 395 | IF ( value_ijk(2) < 0 ) value_ijk(2) = ny +1 + value_ijk(2) |
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| 396 | IF ( value_ijk(2) > ny ) value_ijk(2) = value_ijk(2) - (ny+1) |
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| 397 | |
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| 398 | |
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| 399 | END SUBROUTINE global_min_max |
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