| 1 | SUBROUTINE global_min_max( i1, i2, j1, j2, k1, k2, ar, mode, 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 | ! Current revisions: |
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| 6 | ! ----------------- |
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| 7 | ! |
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| 8 | ! |
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| 9 | ! Former revisions: |
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| 10 | ! ----------------- |
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| 11 | ! $Id: global_min_max.f90 623 2010-12-10 08:52:17Z raasch $ |
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| 12 | ! |
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| 13 | ! 622 2010-12-10 08:08:13Z raasch |
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| 14 | ! optional barriers included in order to speed up collective operations |
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| 15 | ! |
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| 16 | ! Feb. 2007 |
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| 17 | ! RCS Log replace by Id keyword, revision history cleaned up |
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| 18 | ! |
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| 19 | ! Revision 1.11 2003/04/16 12:56:58 raasch |
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| 20 | ! Index values of the extrema are limited to the range 0..nx, 0..ny |
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| 21 | ! |
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| 22 | ! Revision 1.1 1997/07/24 11:14:03 raasch |
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| 23 | ! Initial revision |
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| 24 | ! |
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| 25 | ! |
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| 26 | ! Description: |
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| 27 | ! ------------ |
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| 28 | ! Determine the array minimum/maximum and the corresponding indices. |
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| 29 | !------------------------------------------------------------------------------! |
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| 30 | |
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| 31 | USE indices |
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| 32 | USE pegrid |
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| 33 | |
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| 34 | IMPLICIT NONE |
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| 35 | |
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| 36 | CHARACTER (LEN=*) :: mode |
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| 37 | |
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| 38 | INTEGER :: i, i1, i2, id_fmax, id_fmin, j, j1, j2, k, k1, k2, & |
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| 39 | fmax_ijk(3), fmax_ijk_l(3), fmin_ijk(3), & |
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| 40 | fmin_ijk_l(3), value_ijk(3) |
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| 41 | INTEGER, OPTIONAL :: value1_ijk(3) |
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| 42 | REAL :: value, & |
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| 43 | ar(i1:i2,j1:j2,k1:k2) |
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| 44 | #if defined( __ibm ) |
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| 45 | REAL (KIND=4) :: fmax(2), fmax_l(2), fmin(2), fmin_l(2) ! on 32bit- |
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| 46 | ! machines MPI_2REAL must not be replaced by |
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| 47 | ! MPI_2DOUBLE_PRECISION |
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| 48 | #else |
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| 49 | REAL :: fmax(2), fmax_l(2), fmin(2), fmin_l(2) |
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| 50 | #endif |
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| 51 | REAL, OPTIONAL :: value1 |
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| 52 | |
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| 53 | |
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| 54 | ! |
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| 55 | !-- Determine array minimum |
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| 56 | IF ( mode == 'min' .OR. mode == 'minmax' ) THEN |
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| 57 | |
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| 58 | ! |
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| 59 | !-- Determine the local minimum |
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| 60 | fmin_ijk_l = MINLOC( ar ) |
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| 61 | fmin_ijk_l(1) = i1 + fmin_ijk_l(1) - 1 ! MINLOC assumes lowerbound = 1 |
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| 62 | fmin_ijk_l(2) = j1 + fmin_ijk_l(2) - 1 |
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| 63 | fmin_ijk_l(3) = k1 + fmin_ijk_l(3) - 1 |
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| 64 | fmin_l(1) = ar(fmin_ijk_l(1),fmin_ijk_l(2),fmin_ijk_l(3)) |
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| 65 | |
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| 66 | #if defined( __parallel ) |
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| 67 | fmin_l(2) = myid |
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| 68 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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| 69 | CALL MPI_ALLREDUCE( fmin_l, fmin, 1, MPI_2REAL, MPI_MINLOC, comm2d, & |
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| 70 | ierr ) |
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| 71 | |
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| 72 | ! |
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| 73 | !-- Determine the global minimum. Result stored on PE0. |
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| 74 | id_fmin = fmin(2) |
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| 75 | IF ( id_fmin /= 0 ) THEN |
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| 76 | IF ( myid == 0 ) THEN |
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| 77 | CALL MPI_RECV( fmin_ijk, 3, MPI_INTEGER, id_fmin, 0, comm2d, & |
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| 78 | status, ierr ) |
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| 79 | ELSEIF ( myid == id_fmin ) THEN |
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| 80 | CALL MPI_SEND( fmin_ijk_l, 3, MPI_INTEGER, 0, 0, comm2d, ierr ) |
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| 81 | ENDIF |
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| 82 | ELSE |
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| 83 | fmin_ijk = fmin_ijk_l |
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| 84 | ENDIF |
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| 85 | ! |
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| 86 | !-- Send the indices of the just determined array minimum to other PEs |
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| 87 | CALL MPI_BCAST( fmin_ijk, 3, MPI_INTEGER, 0, comm2d, ierr ) |
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| 88 | #else |
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| 89 | fmin(1) = fmin_l(1) |
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| 90 | fmin_ijk = fmin_ijk_l |
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| 91 | #endif |
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| 92 | |
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| 93 | ENDIF |
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| 94 | |
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| 95 | ! |
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| 96 | !-- Determine array maximum |
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| 97 | IF ( mode == 'max' .OR. mode == 'minmax' ) THEN |
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| 98 | |
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| 99 | ! |
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| 100 | !-- Determine the local maximum |
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| 101 | fmax_ijk_l = MAXLOC( ar ) |
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| 102 | fmax_ijk_l(1) = i1 + fmax_ijk_l(1) - 1 ! MAXLOC assumes lowerbound = 1 |
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| 103 | fmax_ijk_l(2) = j1 + fmax_ijk_l(2) - 1 |
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| 104 | fmax_ijk_l(3) = k1 + fmax_ijk_l(3) - 1 |
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| 105 | fmax_l(1) = ar(fmax_ijk_l(1),fmax_ijk_l(2),fmax_ijk_l(3)) |
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| 106 | |
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| 107 | #if defined( __parallel ) |
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| 108 | fmax_l(2) = myid |
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| 109 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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| 110 | CALL MPI_ALLREDUCE( fmax_l, fmax, 1, MPI_2REAL, MPI_MAXLOC, comm2d, & |
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| 111 | ierr ) |
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| 112 | |
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| 113 | ! |
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| 114 | !-- Determine the global maximum. Result stored on PE0. |
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| 115 | id_fmax = fmax(2) |
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| 116 | IF ( id_fmax /= 0 ) THEN |
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| 117 | IF ( myid == 0 ) THEN |
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| 118 | CALL MPI_RECV( fmax_ijk, 3, MPI_INTEGER, id_fmax, 0, comm2d, & |
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| 119 | status, ierr ) |
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| 120 | ELSEIF ( myid == id_fmax ) THEN |
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| 121 | CALL MPI_SEND( fmax_ijk_l, 3, MPI_INTEGER, 0, 0, comm2d, ierr ) |
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| 122 | ENDIF |
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| 123 | ELSE |
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| 124 | fmax_ijk = fmax_ijk_l |
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| 125 | ENDIF |
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| 126 | ! |
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| 127 | !-- send the indices of the just determined array maximum to other PEs |
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| 128 | CALL MPI_BCAST( fmax_ijk, 3, MPI_INTEGER, 0, comm2d, ierr ) |
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| 129 | #else |
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| 130 | fmax(1) = fmax_l(1) |
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| 131 | fmax_ijk = fmax_ijk_l |
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| 132 | #endif |
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| 133 | |
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| 134 | ENDIF |
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| 135 | |
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| 136 | ! |
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| 137 | !-- Determine absolute array maximum |
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| 138 | IF ( mode == 'abs' ) THEN |
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| 139 | |
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| 140 | ! |
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| 141 | !-- Determine the local absolut maximum |
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| 142 | fmax_l(1) = 0.0 |
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| 143 | fmax_ijk_l(1) = i1 |
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| 144 | fmax_ijk_l(2) = j1 |
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| 145 | fmax_ijk_l(3) = k1 |
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| 146 | DO k = k1, k2 |
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| 147 | DO j = j1, j2 |
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| 148 | DO i = i1, i2 |
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| 149 | IF ( ABS( ar(i,j,k) ) > fmax_l(1) ) THEN |
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| 150 | fmax_l(1) = ABS( ar(i,j,k) ) |
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| 151 | fmax_ijk_l(1) = i |
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| 152 | fmax_ijk_l(2) = j |
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| 153 | fmax_ijk_l(3) = k |
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| 154 | ENDIF |
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| 155 | ENDDO |
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| 156 | ENDDO |
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| 157 | ENDDO |
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| 158 | |
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| 159 | ! |
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| 160 | !-- Set a flag in case that the determined value is negative. |
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| 161 | !-- A constant offset has to be subtracted in order to handle the special |
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| 162 | !-- case i=0 correctly |
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| 163 | IF ( ar(fmax_ijk_l(1),fmax_ijk_l(2),fmax_ijk_l(3)) < 0.0 ) THEN |
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| 164 | fmax_ijk_l(1) = -fmax_ijk_l(1) - 10 |
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| 165 | ENDIF |
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| 166 | |
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| 167 | #if defined( __parallel ) |
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| 168 | fmax_l(2) = myid |
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| 169 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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| 170 | CALL MPI_ALLREDUCE( fmax_l, fmax, 1, MPI_2REAL, MPI_MAXLOC, comm2d, & |
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| 171 | ierr ) |
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| 172 | |
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| 173 | ! |
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| 174 | !-- Determine the global absolut maximum. Result stored on PE0. |
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| 175 | id_fmax = fmax(2) |
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| 176 | IF ( id_fmax /= 0 ) THEN |
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| 177 | IF ( myid == 0 ) THEN |
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| 178 | CALL MPI_RECV( fmax_ijk, 3, MPI_INTEGER, id_fmax, 0, comm2d, & |
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| 179 | status, ierr ) |
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| 180 | ELSEIF ( myid == id_fmax ) THEN |
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| 181 | CALL MPI_SEND( fmax_ijk_l, 3, MPI_INTEGER, 0, 0, comm2d, ierr ) |
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| 182 | ENDIF |
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| 183 | ELSE |
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| 184 | fmax_ijk = fmax_ijk_l |
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| 185 | ENDIF |
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| 186 | ! |
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| 187 | !-- Send the indices of the just determined absolut maximum to other PEs |
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| 188 | CALL MPI_BCAST( fmax_ijk, 3, MPI_INTEGER, 0, comm2d, ierr ) |
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| 189 | #else |
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| 190 | fmax(1) = fmax_l(1) |
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| 191 | fmax_ijk = fmax_ijk_l |
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| 192 | #endif |
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| 193 | |
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| 194 | ENDIF |
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| 195 | |
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| 196 | ! |
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| 197 | !-- Determine output parameters |
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| 198 | SELECT CASE( mode ) |
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| 199 | |
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| 200 | CASE( 'min' ) |
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| 201 | |
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| 202 | value = fmin(1) |
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| 203 | value_ijk = fmin_ijk |
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| 204 | |
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| 205 | CASE( 'max' ) |
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| 206 | |
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| 207 | value = fmax(1) |
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| 208 | value_ijk = fmax_ijk |
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| 209 | |
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| 210 | CASE( 'minmax' ) |
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| 211 | |
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| 212 | value = fmin(1) |
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| 213 | value_ijk = fmin_ijk |
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| 214 | value1 = fmax(1) |
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| 215 | value1_ijk = fmax_ijk |
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| 216 | |
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| 217 | CASE( 'abs' ) |
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| 218 | |
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| 219 | value = fmax(1) |
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| 220 | value_ijk = fmax_ijk |
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| 221 | IF ( fmax_ijk(1) < 0 ) THEN |
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| 222 | value = -value |
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| 223 | value_ijk(1) = -value_ijk(1) - 10 |
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| 224 | ENDIF |
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| 225 | |
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| 226 | END SELECT |
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| 227 | |
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| 228 | ! |
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| 229 | !-- Limit index values to the range 0..nx, 0..ny |
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| 230 | IF ( value_ijk(3) == -1 ) value_ijk(3) = nx |
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| 231 | IF ( value_ijk(3) == nx+1 ) value_ijk(3) = 0 |
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| 232 | IF ( value_ijk(2) == -1 ) value_ijk(2) = ny |
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| 233 | IF ( value_ijk(2) == ny+1 ) value_ijk(2) = 0 |
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| 234 | |
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| 235 | |
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| 236 | END SUBROUTINE global_min_max |
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