| 1 | SUBROUTINE global_min_max( i1, i2, j1, j2, k1, k2, ar, mode, offset, value, & |
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| 2 | value_ijk, value1, value1_ijk ) |
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| 3 | |
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| 4 | !--------------------------------------------------------------------------------! |
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| 5 | ! This file is part of PALM. |
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| 6 | ! |
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| 7 | ! PALM is free software: you can redistribute it and/or modify it under the terms |
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| 8 | ! of the GNU General Public License as published by the Free Software Foundation, |
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| 9 | ! either version 3 of the License, or (at your option) any later version. |
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| 10 | ! |
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| 11 | ! PALM is distributed in the hope that it will be useful, but WITHOUT ANY |
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| 12 | ! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR |
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| 13 | ! A PARTICULAR PURPOSE. See the GNU General Public License for more details. |
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| 14 | ! |
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| 15 | ! You should have received a copy of the GNU General Public License along with |
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| 16 | ! PALM. If not, see <http://www.gnu.org/licenses/>. |
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| 17 | ! |
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| 18 | ! Copyright 1997-2014 Leibniz Universitaet Hannover |
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| 19 | !--------------------------------------------------------------------------------! |
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| 20 | ! |
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| 21 | ! Current revisions: |
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| 22 | ! ------------------ |
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| 23 | ! |
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| 24 | ! |
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| 25 | ! Former revisions: |
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| 26 | ! ----------------- |
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| 27 | ! $Id: global_min_max.f90 1321 2014-03-20 09:40:40Z raasch $ |
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| 28 | ! |
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| 29 | ! 1320 2014-03-20 08:40:49Z raasch |
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| 30 | ! ONLY-attribute added to USE-statements, |
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| 31 | ! kind-parameters added to all INTEGER and REAL declaration statements, |
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| 32 | ! kinds are defined in new module kinds, |
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| 33 | ! revision history before 2012 removed, |
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| 34 | ! comment fields (!:) to be used for variable explanations added to |
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| 35 | ! all variable declaration statements |
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| 36 | ! |
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| 37 | ! 1188 2013-06-20 12:00:08Z heinze |
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| 38 | ! Bugfix in modes 'min' and 'max': x and z component were interchanged |
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| 39 | ! |
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| 40 | ! 1036 2012-10-22 13:43:42Z raasch |
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| 41 | ! code put under GPL (PALM 3.9) |
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| 42 | ! |
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| 43 | ! 866 2012-03-28 06:44:41Z raasch |
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| 44 | ! new mode "absoff" accounts for an offset in the respective array |
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| 45 | ! |
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| 46 | ! Revision 1.1 1997/07/24 11:14:03 raasch |
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| 47 | ! Initial revision |
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| 48 | ! |
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| 49 | ! |
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| 50 | ! Description: |
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| 51 | ! ------------ |
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| 52 | ! Determine the array minimum/maximum and the corresponding indices. |
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| 53 | !------------------------------------------------------------------------------! |
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| 54 | |
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| 55 | USE indices, & |
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| 56 | ONLY: nbgp, ny, nx |
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| 57 | |
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| 58 | USE kinds |
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| 59 | |
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| 60 | USE pegrid |
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| 61 | |
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| 62 | IMPLICIT NONE |
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| 63 | |
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| 64 | CHARACTER (LEN=*) :: mode !: |
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| 65 | |
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| 66 | INTEGER(iwp) :: i !: |
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| 67 | INTEGER(iwp) :: i1 !: |
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| 68 | INTEGER(iwp) :: i2 !: |
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| 69 | INTEGER(iwp) :: id_fmax !: |
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| 70 | INTEGER(iwp) :: id_fmin !: |
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| 71 | INTEGER(iwp) :: j !: |
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| 72 | INTEGER(iwp) :: j1 !: |
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| 73 | INTEGER(iwp) :: j2 !: |
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| 74 | INTEGER(iwp) :: k !: |
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| 75 | INTEGER(iwp) :: k1 !: |
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| 76 | INTEGER(iwp) :: k2 !: |
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| 77 | INTEGER(iwp) :: fmax_ijk(3) !: |
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| 78 | INTEGER(iwp) :: fmax_ijk_l(3) !: |
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| 79 | INTEGER(iwp) :: fmin_ijk(3) !: |
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| 80 | INTEGER(iwp) :: fmin_ijk_l(3) !: |
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| 81 | INTEGER(iwp) :: value_ijk(3) !: |
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| 82 | |
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| 83 | INTEGER(iwp), OPTIONAL :: value1_ijk(3) !: |
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| 84 | |
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| 85 | REAL(wp) :: offset !: |
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| 86 | REAL(wp) :: value !: |
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| 87 | REAL(wp) :: ar(i1:i2,j1:j2,k1:k2) !: |
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| 88 | |
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| 89 | #if defined( __ibm ) |
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| 90 | REAL(sp) :: fmax(2) !: |
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| 91 | REAL(sp) :: fmax_l(2) !: |
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| 92 | REAL(sp) :: fmin(2) !: |
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| 93 | REAL(sp) :: fmin_l(2) !: |
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| 94 | ! on 32bit-machines MPI_2REAL must not be replaced |
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| 95 | ! by MPI_2DOUBLE_PRECISION |
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| 96 | #else |
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| 97 | REAL(wp) :: fmax(2) !: |
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| 98 | REAL(wp) :: fmax_l(2) !: |
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| 99 | REAL(wp) :: fmin(2) !: |
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| 100 | REAL(wp) :: fmin_l(2) !: |
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| 101 | #endif |
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| 102 | REAL(wp), OPTIONAL :: value1 !: |
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| 103 | |
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| 104 | |
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| 105 | ! |
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| 106 | !-- Determine array minimum |
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| 107 | IF ( mode == 'min' .OR. mode == 'minmax' ) THEN |
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| 108 | |
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| 109 | ! |
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| 110 | !-- Determine the local minimum |
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| 111 | fmin_ijk_l = MINLOC( ar ) |
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| 112 | fmin_ijk_l(1) = i1 + fmin_ijk_l(1) - 1 ! MINLOC assumes lowerbound = 1 |
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| 113 | fmin_ijk_l(2) = j1 + fmin_ijk_l(2) - nbgp |
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| 114 | fmin_ijk_l(3) = k1 + fmin_ijk_l(3) - nbgp |
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| 115 | fmin_l(1) = ar(fmin_ijk_l(1),fmin_ijk_l(2),fmin_ijk_l(3)) |
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| 116 | |
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| 117 | #if defined( __parallel ) |
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| 118 | fmin_l(2) = myid |
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| 119 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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| 120 | CALL MPI_ALLREDUCE( fmin_l, fmin, 1, MPI_2REAL, MPI_MINLOC, comm2d, & |
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| 121 | ierr ) |
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| 122 | |
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| 123 | ! |
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| 124 | !-- Determine the global minimum. Result stored on PE0. |
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| 125 | id_fmin = fmin(2) |
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| 126 | IF ( id_fmin /= 0 ) THEN |
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| 127 | IF ( myid == 0 ) THEN |
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| 128 | CALL MPI_RECV( fmin_ijk, 3, MPI_INTEGER, id_fmin, 0, comm2d, & |
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| 129 | status, ierr ) |
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| 130 | ELSEIF ( myid == id_fmin ) THEN |
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| 131 | CALL MPI_SEND( fmin_ijk_l, 3, MPI_INTEGER, 0, 0, comm2d, ierr ) |
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| 132 | ENDIF |
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| 133 | ELSE |
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| 134 | fmin_ijk = fmin_ijk_l |
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| 135 | ENDIF |
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| 136 | ! |
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| 137 | !-- Send the indices of the just determined array minimum to other PEs |
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| 138 | CALL MPI_BCAST( fmin_ijk, 3, MPI_INTEGER, 0, comm2d, ierr ) |
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| 139 | #else |
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| 140 | fmin(1) = fmin_l(1) |
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| 141 | fmin_ijk = fmin_ijk_l |
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| 142 | #endif |
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| 143 | |
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| 144 | ENDIF |
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| 145 | |
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| 146 | ! |
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| 147 | !-- Determine array maximum |
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| 148 | IF ( mode == 'max' .OR. mode == 'minmax' ) THEN |
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| 149 | |
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| 150 | ! |
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| 151 | !-- Determine the local maximum |
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| 152 | fmax_ijk_l = MAXLOC( ar ) |
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| 153 | fmax_ijk_l(1) = i1 + fmax_ijk_l(1) - 1 ! MAXLOC assumes lowerbound = 1 |
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| 154 | fmax_ijk_l(2) = j1 + fmax_ijk_l(2) - nbgp |
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| 155 | fmax_ijk_l(3) = k1 + fmax_ijk_l(3) - nbgp |
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| 156 | fmax_l(1) = ar(fmax_ijk_l(1),fmax_ijk_l(2),fmax_ijk_l(3)) |
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| 157 | |
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| 158 | #if defined( __parallel ) |
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| 159 | fmax_l(2) = myid |
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| 160 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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| 161 | CALL MPI_ALLREDUCE( fmax_l, fmax, 1, MPI_2REAL, MPI_MAXLOC, comm2d, & |
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| 162 | ierr ) |
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| 163 | |
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| 164 | ! |
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| 165 | !-- Determine the global maximum. Result stored on PE0. |
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| 166 | id_fmax = fmax(2) |
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| 167 | IF ( id_fmax /= 0 ) THEN |
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| 168 | IF ( myid == 0 ) THEN |
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| 169 | CALL MPI_RECV( fmax_ijk, 3, MPI_INTEGER, id_fmax, 0, comm2d, & |
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| 170 | status, ierr ) |
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| 171 | ELSEIF ( myid == id_fmax ) THEN |
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| 172 | CALL MPI_SEND( fmax_ijk_l, 3, MPI_INTEGER, 0, 0, comm2d, ierr ) |
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| 173 | ENDIF |
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| 174 | ELSE |
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| 175 | fmax_ijk = fmax_ijk_l |
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| 176 | ENDIF |
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| 177 | ! |
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| 178 | !-- send the indices of the just determined array maximum to other PEs |
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| 179 | CALL MPI_BCAST( fmax_ijk, 3, MPI_INTEGER, 0, comm2d, ierr ) |
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| 180 | #else |
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| 181 | fmax(1) = fmax_l(1) |
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| 182 | fmax_ijk = fmax_ijk_l |
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| 183 | #endif |
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| 184 | |
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| 185 | ENDIF |
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| 186 | |
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| 187 | ! |
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| 188 | !-- Determine absolute array maximum |
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| 189 | IF ( mode == 'abs' ) THEN |
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| 190 | |
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| 191 | ! |
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| 192 | !-- Determine the local absolut maximum |
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| 193 | fmax_l(1) = 0.0 |
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| 194 | fmax_ijk_l(1) = i1 |
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| 195 | fmax_ijk_l(2) = j1 |
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| 196 | fmax_ijk_l(3) = k1 |
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| 197 | DO k = k1, k2 |
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| 198 | DO j = j1, j2 |
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| 199 | DO i = i1, i2 |
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| 200 | IF ( ABS( ar(i,j,k) ) > fmax_l(1) ) THEN |
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| 201 | fmax_l(1) = ABS( ar(i,j,k) ) |
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| 202 | fmax_ijk_l(1) = i |
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| 203 | fmax_ijk_l(2) = j |
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| 204 | fmax_ijk_l(3) = k |
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| 205 | ENDIF |
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| 206 | ENDDO |
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| 207 | ENDDO |
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| 208 | ENDDO |
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| 209 | |
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| 210 | ! |
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| 211 | !-- Set a flag in case that the determined value is negative. |
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| 212 | !-- A constant offset has to be subtracted in order to handle the special |
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| 213 | !-- case i=0 correctly |
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| 214 | IF ( ar(fmax_ijk_l(1),fmax_ijk_l(2),fmax_ijk_l(3)) < 0.0 ) THEN |
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| 215 | fmax_ijk_l(1) = -fmax_ijk_l(1) - 10 |
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| 216 | ENDIF |
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| 217 | |
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| 218 | #if defined( __parallel ) |
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| 219 | fmax_l(2) = myid |
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| 220 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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| 221 | CALL MPI_ALLREDUCE( fmax_l, fmax, 1, MPI_2REAL, MPI_MAXLOC, comm2d, & |
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| 222 | ierr ) |
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| 223 | |
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| 224 | ! |
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| 225 | !-- Determine the global absolut maximum. Result stored on PE0. |
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| 226 | id_fmax = fmax(2) |
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| 227 | IF ( id_fmax /= 0 ) THEN |
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| 228 | IF ( myid == 0 ) THEN |
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| 229 | CALL MPI_RECV( fmax_ijk, 3, MPI_INTEGER, id_fmax, 0, comm2d, & |
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| 230 | status, ierr ) |
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| 231 | ELSEIF ( myid == id_fmax ) THEN |
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| 232 | CALL MPI_SEND( fmax_ijk_l, 3, MPI_INTEGER, 0, 0, comm2d, ierr ) |
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| 233 | ENDIF |
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| 234 | ELSE |
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| 235 | fmax_ijk = fmax_ijk_l |
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| 236 | ENDIF |
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| 237 | ! |
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| 238 | !-- Send the indices of the just determined absolut maximum to other PEs |
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| 239 | CALL MPI_BCAST( fmax_ijk, 3, MPI_INTEGER, 0, comm2d, ierr ) |
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| 240 | #else |
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| 241 | fmax(1) = fmax_l(1) |
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| 242 | fmax_ijk = fmax_ijk_l |
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| 243 | #endif |
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| 244 | |
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| 245 | ENDIF |
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| 246 | |
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| 247 | ! |
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| 248 | !-- Determine absolute maximum of ( array - offset ) |
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| 249 | IF ( mode == 'absoff' ) THEN |
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| 250 | |
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| 251 | ! |
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| 252 | !-- Determine the local absolut maximum |
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| 253 | fmax_l(1) = 0.0 |
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| 254 | fmax_ijk_l(1) = i1 |
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| 255 | fmax_ijk_l(2) = j1 |
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| 256 | fmax_ijk_l(3) = k1 |
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| 257 | DO k = k1, k2 |
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| 258 | DO j = j1, j2 |
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| 259 | ! |
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| 260 | !-- Attention: the lowest gridpoint is excluded here, because there |
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| 261 | !-- --------- is no advection at nzb=0 and mode 'absoff' is only |
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| 262 | !-- used for calculating u,v extrema for CFL-criteria |
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| 263 | DO i = i1+1, i2 |
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| 264 | IF ( ABS( ar(i,j,k) - offset ) > fmax_l(1) ) THEN |
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| 265 | fmax_l(1) = ABS( ar(i,j,k) - offset ) |
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| 266 | fmax_ijk_l(1) = i |
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| 267 | fmax_ijk_l(2) = j |
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| 268 | fmax_ijk_l(3) = k |
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| 269 | ENDIF |
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| 270 | ENDDO |
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| 271 | ENDDO |
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| 272 | ENDDO |
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| 273 | |
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| 274 | ! |
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| 275 | !-- Set a flag in case that the determined value is negative. |
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| 276 | !-- A constant offset has to be subtracted in order to handle the special |
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| 277 | !-- case i=0 correctly |
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| 278 | IF ( ar(fmax_ijk_l(1),fmax_ijk_l(2),fmax_ijk_l(3)) < 0.0 ) THEN |
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| 279 | fmax_ijk_l(1) = -fmax_ijk_l(1) - 10 |
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| 280 | ENDIF |
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| 281 | |
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| 282 | #if defined( __parallel ) |
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| 283 | fmax_l(2) = myid |
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| 284 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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| 285 | CALL MPI_ALLREDUCE( fmax_l, fmax, 1, MPI_2REAL, MPI_MAXLOC, comm2d, & |
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| 286 | ierr ) |
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| 287 | |
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| 288 | ! |
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| 289 | !-- Determine the global absolut maximum. Result stored on PE0. |
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| 290 | id_fmax = fmax(2) |
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| 291 | IF ( id_fmax /= 0 ) THEN |
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| 292 | IF ( myid == 0 ) THEN |
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| 293 | CALL MPI_RECV( fmax_ijk, 3, MPI_INTEGER, id_fmax, 0, comm2d, & |
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| 294 | status, ierr ) |
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| 295 | ELSEIF ( myid == id_fmax ) THEN |
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| 296 | CALL MPI_SEND( fmax_ijk_l, 3, MPI_INTEGER, 0, 0, comm2d, ierr ) |
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| 297 | ENDIF |
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| 298 | ELSE |
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| 299 | fmax_ijk = fmax_ijk_l |
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| 300 | ENDIF |
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| 301 | ! |
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| 302 | !-- Send the indices of the just determined absolut maximum to other PEs |
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| 303 | CALL MPI_BCAST( fmax_ijk, 3, MPI_INTEGER, 0, comm2d, ierr ) |
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| 304 | #else |
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| 305 | fmax(1) = fmax_l(1) |
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| 306 | fmax_ijk = fmax_ijk_l |
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| 307 | #endif |
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| 308 | |
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| 309 | ENDIF |
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| 310 | |
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| 311 | ! |
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| 312 | !-- Determine output parameters |
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| 313 | SELECT CASE( mode ) |
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| 314 | |
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| 315 | CASE( 'min' ) |
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| 316 | |
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| 317 | value = fmin(1) |
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| 318 | value_ijk = fmin_ijk |
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| 319 | |
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| 320 | CASE( 'max' ) |
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| 321 | |
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| 322 | value = fmax(1) |
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| 323 | value_ijk = fmax_ijk |
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| 324 | |
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| 325 | CASE( 'minmax' ) |
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| 326 | |
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| 327 | value = fmin(1) |
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| 328 | value_ijk = fmin_ijk |
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| 329 | value1 = fmax(1) |
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| 330 | value1_ijk = fmax_ijk |
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| 331 | |
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| 332 | CASE( 'abs', 'absoff' ) |
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| 333 | |
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| 334 | value = fmax(1) |
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| 335 | value_ijk = fmax_ijk |
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| 336 | IF ( fmax_ijk(1) < 0 ) THEN |
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| 337 | value = -value |
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| 338 | value_ijk(1) = -value_ijk(1) - 10 !??? |
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| 339 | ENDIF |
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| 340 | |
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| 341 | END SELECT |
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| 342 | |
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| 343 | ! |
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| 344 | !-- Limit index values to the range 0..nx, 0..ny |
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| 345 | IF ( value_ijk(3) < 0 ) value_ijk(3) = nx +1 + value_ijk(3) |
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| 346 | IF ( value_ijk(3) > nx ) value_ijk(3) = value_ijk(3) - (nx+1) |
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| 347 | IF ( value_ijk(2) < 0 ) value_ijk(2) = ny +1 + value_ijk(2) |
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| 348 | IF ( value_ijk(2) > ny ) value_ijk(2) = value_ijk(2) - (ny+1) |
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| 349 | |
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| 350 | |
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| 351 | END SUBROUTINE global_min_max |
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