| 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 1997-2012 Leibniz University 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 1037 2012-10-22 14:10:22Z suehring $ |
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| 28 | ! |
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| 29 | ! 1036 2012-10-22 13:43:42Z raasch |
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| 30 | ! code put under GPL (PALM 3.9) |
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| 31 | ! |
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| 32 | ! 866 2012-03-28 06:44:41Z raasch |
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| 33 | ! new mode "absoff" accounts for an offset in the respective array |
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| 34 | ! |
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| 35 | ! 667 2010-12-23 12:06:00Z suehring/gryschka |
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| 36 | ! Adapting of the index arrays, because MINLOC assumes lowerbound at 1 and not |
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| 37 | ! at nbgp. |
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| 38 | ! |
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| 39 | ! 622 2010-12-10 08:08:13Z raasch |
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| 40 | ! optional barriers included in order to speed up collective operations |
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| 41 | ! |
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| 42 | ! Feb. 2007 |
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| 43 | ! RCS Log replace by Id keyword, revision history cleaned up |
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| 44 | ! |
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| 45 | ! Revision 1.11 2003/04/16 12:56:58 raasch |
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| 46 | ! Index values of the extrema are limited to the range 0..nx, 0..ny |
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| 47 | ! |
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| 48 | ! Revision 1.1 1997/07/24 11:14:03 raasch |
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| 49 | ! Initial revision |
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| 50 | ! |
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| 51 | ! |
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| 52 | ! Description: |
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| 53 | ! ------------ |
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| 54 | ! Determine the array minimum/maximum and the corresponding indices. |
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| 55 | !------------------------------------------------------------------------------! |
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| 56 | |
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| 57 | USE indices |
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| 58 | USE pegrid |
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| 59 | |
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| 60 | IMPLICIT NONE |
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| 61 | |
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| 62 | CHARACTER (LEN=*) :: mode |
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| 63 | |
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| 64 | INTEGER :: i, i1, i2, id_fmax, id_fmin, j, j1, j2, k, k1, k2, & |
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| 65 | fmax_ijk(3), fmax_ijk_l(3), fmin_ijk(3), & |
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| 66 | fmin_ijk_l(3), value_ijk(3) |
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| 67 | INTEGER, OPTIONAL :: value1_ijk(3) |
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| 68 | REAL :: offset, value, & |
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| 69 | ar(i1:i2,j1:j2,k1:k2) |
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| 70 | #if defined( __ibm ) |
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| 71 | REAL (KIND=4) :: fmax(2), fmax_l(2), fmin(2), fmin_l(2) ! on 32bit- |
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| 72 | ! machines MPI_2REAL must not be replaced by |
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| 73 | ! MPI_2DOUBLE_PRECISION |
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| 74 | #else |
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| 75 | REAL :: fmax(2), fmax_l(2), fmin(2), fmin_l(2) |
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| 76 | #endif |
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| 77 | REAL, OPTIONAL :: value1 |
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| 78 | |
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| 79 | |
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| 80 | ! |
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| 81 | !-- Determine array minimum |
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| 82 | IF ( mode == 'min' .OR. mode == 'minmax' ) THEN |
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| 83 | |
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| 84 | ! |
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| 85 | !-- Determine the local minimum |
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| 86 | fmin_ijk_l = MINLOC( ar ) |
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| 87 | fmin_ijk_l(1) = i1 + fmin_ijk_l(1) - nbgp ! MINLOC assumes lowerbound = 1 |
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| 88 | fmin_ijk_l(2) = j1 + fmin_ijk_l(2) - nbgp |
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| 89 | fmin_ijk_l(3) = k1 + fmin_ijk_l(3) - 1 |
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| 90 | fmin_l(1) = ar(fmin_ijk_l(1),fmin_ijk_l(2),fmin_ijk_l(3)) |
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| 91 | |
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| 92 | #if defined( __parallel ) |
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| 93 | fmin_l(2) = myid |
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| 94 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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| 95 | CALL MPI_ALLREDUCE( fmin_l, fmin, 1, MPI_2REAL, MPI_MINLOC, comm2d, & |
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| 96 | ierr ) |
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| 97 | |
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| 98 | ! |
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| 99 | !-- Determine the global minimum. Result stored on PE0. |
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| 100 | id_fmin = fmin(2) |
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| 101 | IF ( id_fmin /= 0 ) THEN |
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| 102 | IF ( myid == 0 ) THEN |
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| 103 | CALL MPI_RECV( fmin_ijk, 3, MPI_INTEGER, id_fmin, 0, comm2d, & |
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| 104 | status, ierr ) |
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| 105 | ELSEIF ( myid == id_fmin ) THEN |
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| 106 | CALL MPI_SEND( fmin_ijk_l, 3, MPI_INTEGER, 0, 0, comm2d, ierr ) |
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| 107 | ENDIF |
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| 108 | ELSE |
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| 109 | fmin_ijk = fmin_ijk_l |
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| 110 | ENDIF |
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| 111 | ! |
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| 112 | !-- Send the indices of the just determined array minimum to other PEs |
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| 113 | CALL MPI_BCAST( fmin_ijk, 3, MPI_INTEGER, 0, comm2d, ierr ) |
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| 114 | #else |
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| 115 | fmin(1) = fmin_l(1) |
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| 116 | fmin_ijk = fmin_ijk_l |
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| 117 | #endif |
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| 118 | |
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| 119 | ENDIF |
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| 120 | |
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| 121 | ! |
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| 122 | !-- Determine array maximum |
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| 123 | IF ( mode == 'max' .OR. mode == 'minmax' ) THEN |
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| 124 | |
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| 125 | ! |
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| 126 | !-- Determine the local maximum |
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| 127 | fmax_ijk_l = MAXLOC( ar ) |
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| 128 | fmax_ijk_l(1) = i1 + fmax_ijk_l(1) - nbgp ! MAXLOC assumes lowerbound = 1 |
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| 129 | fmax_ijk_l(2) = j1 + fmax_ijk_l(2) - nbgp |
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| 130 | fmax_ijk_l(3) = k1 + fmax_ijk_l(3) - 1 |
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| 131 | fmax_l(1) = ar(fmax_ijk_l(1),fmax_ijk_l(2),fmax_ijk_l(3)) |
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| 132 | |
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| 133 | #if defined( __parallel ) |
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| 134 | fmax_l(2) = myid |
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| 135 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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| 136 | CALL MPI_ALLREDUCE( fmax_l, fmax, 1, MPI_2REAL, MPI_MAXLOC, comm2d, & |
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| 137 | ierr ) |
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| 138 | |
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| 139 | ! |
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| 140 | !-- Determine the global maximum. Result stored on PE0. |
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| 141 | id_fmax = fmax(2) |
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| 142 | IF ( id_fmax /= 0 ) THEN |
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| 143 | IF ( myid == 0 ) THEN |
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| 144 | CALL MPI_RECV( fmax_ijk, 3, MPI_INTEGER, id_fmax, 0, comm2d, & |
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| 145 | status, ierr ) |
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| 146 | ELSEIF ( myid == id_fmax ) THEN |
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| 147 | CALL MPI_SEND( fmax_ijk_l, 3, MPI_INTEGER, 0, 0, comm2d, ierr ) |
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| 148 | ENDIF |
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| 149 | ELSE |
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| 150 | fmax_ijk = fmax_ijk_l |
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| 151 | ENDIF |
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| 152 | ! |
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| 153 | !-- send the indices of the just determined array maximum to other PEs |
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| 154 | CALL MPI_BCAST( fmax_ijk, 3, MPI_INTEGER, 0, comm2d, ierr ) |
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| 155 | #else |
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| 156 | fmax(1) = fmax_l(1) |
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| 157 | fmax_ijk = fmax_ijk_l |
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| 158 | #endif |
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| 159 | |
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| 160 | ENDIF |
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| 161 | |
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| 162 | ! |
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| 163 | !-- Determine absolute array maximum |
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| 164 | IF ( mode == 'abs' ) THEN |
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| 165 | |
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| 166 | ! |
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| 167 | !-- Determine the local absolut maximum |
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| 168 | fmax_l(1) = 0.0 |
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| 169 | fmax_ijk_l(1) = i1 |
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| 170 | fmax_ijk_l(2) = j1 |
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| 171 | fmax_ijk_l(3) = k1 |
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| 172 | DO k = k1, k2 |
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| 173 | DO j = j1, j2 |
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| 174 | DO i = i1, i2 |
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| 175 | IF ( ABS( ar(i,j,k) ) > fmax_l(1) ) THEN |
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| 176 | fmax_l(1) = ABS( ar(i,j,k) ) |
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| 177 | fmax_ijk_l(1) = i |
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| 178 | fmax_ijk_l(2) = j |
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| 179 | fmax_ijk_l(3) = k |
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| 180 | ENDIF |
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| 181 | ENDDO |
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| 182 | ENDDO |
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| 183 | ENDDO |
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| 184 | |
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| 185 | ! |
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| 186 | !-- Set a flag in case that the determined value is negative. |
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| 187 | !-- A constant offset has to be subtracted in order to handle the special |
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| 188 | !-- case i=0 correctly |
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| 189 | IF ( ar(fmax_ijk_l(1),fmax_ijk_l(2),fmax_ijk_l(3)) < 0.0 ) THEN |
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| 190 | fmax_ijk_l(1) = -fmax_ijk_l(1) - 10 |
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| 191 | ENDIF |
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| 192 | |
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| 193 | #if defined( __parallel ) |
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| 194 | fmax_l(2) = myid |
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| 195 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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| 196 | CALL MPI_ALLREDUCE( fmax_l, fmax, 1, MPI_2REAL, MPI_MAXLOC, comm2d, & |
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| 197 | ierr ) |
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| 198 | |
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| 199 | ! |
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| 200 | !-- Determine the global absolut maximum. Result stored on PE0. |
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| 201 | id_fmax = fmax(2) |
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| 202 | IF ( id_fmax /= 0 ) THEN |
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| 203 | IF ( myid == 0 ) THEN |
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| 204 | CALL MPI_RECV( fmax_ijk, 3, MPI_INTEGER, id_fmax, 0, comm2d, & |
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| 205 | status, ierr ) |
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| 206 | ELSEIF ( myid == id_fmax ) THEN |
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| 207 | CALL MPI_SEND( fmax_ijk_l, 3, MPI_INTEGER, 0, 0, comm2d, ierr ) |
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| 208 | ENDIF |
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| 209 | ELSE |
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| 210 | fmax_ijk = fmax_ijk_l |
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| 211 | ENDIF |
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| 212 | ! |
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| 213 | !-- Send the indices of the just determined absolut maximum to other PEs |
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| 214 | CALL MPI_BCAST( fmax_ijk, 3, MPI_INTEGER, 0, comm2d, ierr ) |
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| 215 | #else |
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| 216 | fmax(1) = fmax_l(1) |
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| 217 | fmax_ijk = fmax_ijk_l |
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| 218 | #endif |
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| 219 | |
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| 220 | ENDIF |
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| 221 | |
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| 222 | ! |
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| 223 | !-- Determine absolute maximum of ( array - offset ) |
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| 224 | IF ( mode == 'absoff' ) THEN |
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| 225 | |
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| 226 | ! |
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| 227 | !-- Determine the local absolut maximum |
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| 228 | fmax_l(1) = 0.0 |
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| 229 | fmax_ijk_l(1) = i1 |
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| 230 | fmax_ijk_l(2) = j1 |
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| 231 | fmax_ijk_l(3) = k1 |
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| 232 | DO k = k1, k2 |
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| 233 | DO j = j1, j2 |
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| 234 | ! |
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| 235 | !-- Attention: the lowest gridpoint is excluded here, because there |
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| 236 | !-- --------- is no advection at nzb=0 and mode 'absoff' is only |
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| 237 | !-- used for calculating u,v extrema for CFL-criteria |
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| 238 | DO i = i1+1, i2 |
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| 239 | IF ( ABS( ar(i,j,k) - offset ) > fmax_l(1) ) THEN |
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| 240 | fmax_l(1) = ABS( ar(i,j,k) - offset ) |
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| 241 | fmax_ijk_l(1) = i |
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| 242 | fmax_ijk_l(2) = j |
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| 243 | fmax_ijk_l(3) = k |
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| 244 | ENDIF |
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| 245 | ENDDO |
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| 246 | ENDDO |
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| 247 | ENDDO |
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| 248 | |
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| 249 | ! |
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| 250 | !-- Set a flag in case that the determined value is negative. |
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| 251 | !-- A constant offset has to be subtracted in order to handle the special |
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| 252 | !-- case i=0 correctly |
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| 253 | IF ( ar(fmax_ijk_l(1),fmax_ijk_l(2),fmax_ijk_l(3)) < 0.0 ) THEN |
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| 254 | fmax_ijk_l(1) = -fmax_ijk_l(1) - 10 |
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| 255 | ENDIF |
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| 256 | |
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| 257 | #if defined( __parallel ) |
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| 258 | fmax_l(2) = myid |
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| 259 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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| 260 | CALL MPI_ALLREDUCE( fmax_l, fmax, 1, MPI_2REAL, MPI_MAXLOC, comm2d, & |
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| 261 | ierr ) |
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| 262 | |
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| 263 | ! |
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| 264 | !-- Determine the global absolut maximum. Result stored on PE0. |
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| 265 | id_fmax = fmax(2) |
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| 266 | IF ( id_fmax /= 0 ) THEN |
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| 267 | IF ( myid == 0 ) THEN |
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| 268 | CALL MPI_RECV( fmax_ijk, 3, MPI_INTEGER, id_fmax, 0, comm2d, & |
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| 269 | status, ierr ) |
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| 270 | ELSEIF ( myid == id_fmax ) THEN |
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| 271 | CALL MPI_SEND( fmax_ijk_l, 3, MPI_INTEGER, 0, 0, comm2d, ierr ) |
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| 272 | ENDIF |
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| 273 | ELSE |
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| 274 | fmax_ijk = fmax_ijk_l |
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| 275 | ENDIF |
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| 276 | ! |
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| 277 | !-- Send the indices of the just determined absolut maximum to other PEs |
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| 278 | CALL MPI_BCAST( fmax_ijk, 3, MPI_INTEGER, 0, comm2d, ierr ) |
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| 279 | #else |
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| 280 | fmax(1) = fmax_l(1) |
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| 281 | fmax_ijk = fmax_ijk_l |
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| 282 | #endif |
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| 283 | |
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| 284 | ENDIF |
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| 285 | |
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| 286 | ! |
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| 287 | !-- Determine output parameters |
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| 288 | SELECT CASE( mode ) |
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| 289 | |
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| 290 | CASE( 'min' ) |
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| 291 | |
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| 292 | value = fmin(1) |
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| 293 | value_ijk = fmin_ijk |
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| 294 | |
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| 295 | CASE( 'max' ) |
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| 296 | |
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| 297 | value = fmax(1) |
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| 298 | value_ijk = fmax_ijk |
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| 299 | |
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| 300 | CASE( 'minmax' ) |
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| 301 | |
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| 302 | value = fmin(1) |
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| 303 | value_ijk = fmin_ijk |
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| 304 | value1 = fmax(1) |
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| 305 | value1_ijk = fmax_ijk |
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| 306 | |
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| 307 | CASE( 'abs', 'absoff' ) |
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| 308 | |
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| 309 | value = fmax(1) |
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| 310 | value_ijk = fmax_ijk |
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| 311 | IF ( fmax_ijk(1) < 0 ) THEN |
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| 312 | value = -value |
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| 313 | value_ijk(1) = -value_ijk(1) - 10 !??? |
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| 314 | ENDIF |
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| 315 | |
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| 316 | END SELECT |
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| 317 | |
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| 318 | ! |
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| 319 | !-- Limit index values to the range 0..nx, 0..ny |
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| 320 | IF ( value_ijk(3) < 0 ) value_ijk(3) = nx +1 + value_ijk(3) |
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| 321 | IF ( value_ijk(3) > nx ) value_ijk(3) = value_ijk(3) - (nx+1) |
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| 322 | IF ( value_ijk(2) < 0 ) value_ijk(2) = ny +1 + value_ijk(2) |
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| 323 | IF ( value_ijk(2) > ny ) value_ijk(2) = value_ijk(2) - (ny+1) |
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| 324 | |
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| 325 | |
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| 326 | END SUBROUTINE global_min_max |
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