| 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 | ! 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 867 2012-03-28 06:54:50Z raasch $ |
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| 12 | ! |
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| 13 | ! 866 2012-03-28 06:44:41Z raasch |
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| 14 | ! new mode "absoff" accounts for an offset in the respective array |
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| 15 | ! |
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| 16 | ! 667 2010-12-23 12:06:00Z suehring/gryschka |
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| 17 | ! Adapting of the index arrays, because MINLOC assumes lowerbound at 1 and not |
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| 18 | ! at nbgp. |
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| 19 | ! |
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| 20 | ! 622 2010-12-10 08:08:13Z raasch |
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| 21 | ! optional barriers included in order to speed up collective operations |
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| 22 | ! |
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| 23 | ! Feb. 2007 |
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| 24 | ! RCS Log replace by Id keyword, revision history cleaned up |
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| 25 | ! |
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| 26 | ! Revision 1.11 2003/04/16 12:56:58 raasch |
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| 27 | ! Index values of the extrema are limited to the range 0..nx, 0..ny |
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| 28 | ! |
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| 29 | ! Revision 1.1 1997/07/24 11:14:03 raasch |
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| 30 | ! Initial revision |
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| 31 | ! |
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| 32 | ! |
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| 33 | ! Description: |
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| 34 | ! ------------ |
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| 35 | ! Determine the array minimum/maximum and the corresponding indices. |
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| 36 | !------------------------------------------------------------------------------! |
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| 37 | |
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| 38 | USE indices |
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| 39 | USE pegrid |
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| 40 | |
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| 41 | IMPLICIT NONE |
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| 42 | |
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| 43 | CHARACTER (LEN=*) :: mode |
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| 44 | |
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| 45 | INTEGER :: i, i1, i2, id_fmax, id_fmin, j, j1, j2, k, k1, k2, & |
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| 46 | fmax_ijk(3), fmax_ijk_l(3), fmin_ijk(3), & |
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| 47 | fmin_ijk_l(3), value_ijk(3) |
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| 48 | INTEGER, OPTIONAL :: value1_ijk(3) |
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| 49 | REAL :: offset, value, & |
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| 50 | ar(i1:i2,j1:j2,k1:k2) |
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| 51 | #if defined( __ibm ) |
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| 52 | REAL (KIND=4) :: fmax(2), fmax_l(2), fmin(2), fmin_l(2) ! on 32bit- |
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| 53 | ! machines MPI_2REAL must not be replaced by |
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| 54 | ! MPI_2DOUBLE_PRECISION |
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| 55 | #else |
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| 56 | REAL :: fmax(2), fmax_l(2), fmin(2), fmin_l(2) |
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| 57 | #endif |
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| 58 | REAL, OPTIONAL :: value1 |
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| 59 | |
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| 60 | |
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| 61 | ! |
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| 62 | !-- Determine array minimum |
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| 63 | IF ( mode == 'min' .OR. mode == 'minmax' ) THEN |
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| 64 | |
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| 65 | ! |
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| 66 | !-- Determine the local minimum |
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| 67 | fmin_ijk_l = MINLOC( ar ) |
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| 68 | fmin_ijk_l(1) = i1 + fmin_ijk_l(1) - nbgp ! MINLOC assumes lowerbound = 1 |
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| 69 | fmin_ijk_l(2) = j1 + fmin_ijk_l(2) - nbgp |
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| 70 | fmin_ijk_l(3) = k1 + fmin_ijk_l(3) - 1 |
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| 71 | fmin_l(1) = ar(fmin_ijk_l(1),fmin_ijk_l(2),fmin_ijk_l(3)) |
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| 72 | |
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| 73 | #if defined( __parallel ) |
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| 74 | fmin_l(2) = myid |
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| 75 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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| 76 | CALL MPI_ALLREDUCE( fmin_l, fmin, 1, MPI_2REAL, MPI_MINLOC, comm2d, & |
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| 77 | ierr ) |
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| 78 | |
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| 79 | ! |
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| 80 | !-- Determine the global minimum. Result stored on PE0. |
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| 81 | id_fmin = fmin(2) |
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| 82 | IF ( id_fmin /= 0 ) THEN |
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| 83 | IF ( myid == 0 ) THEN |
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| 84 | CALL MPI_RECV( fmin_ijk, 3, MPI_INTEGER, id_fmin, 0, comm2d, & |
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| 85 | status, ierr ) |
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| 86 | ELSEIF ( myid == id_fmin ) THEN |
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| 87 | CALL MPI_SEND( fmin_ijk_l, 3, MPI_INTEGER, 0, 0, comm2d, ierr ) |
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| 88 | ENDIF |
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| 89 | ELSE |
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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 | !-- Send the indices of the just determined array minimum to other PEs |
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| 94 | CALL MPI_BCAST( fmin_ijk, 3, MPI_INTEGER, 0, comm2d, ierr ) |
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| 95 | #else |
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| 96 | fmin(1) = fmin_l(1) |
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| 97 | fmin_ijk = fmin_ijk_l |
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| 98 | #endif |
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| 99 | |
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| 100 | ENDIF |
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| 101 | |
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| 102 | ! |
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| 103 | !-- Determine array maximum |
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| 104 | IF ( mode == 'max' .OR. mode == 'minmax' ) THEN |
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| 105 | |
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| 106 | ! |
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| 107 | !-- Determine the local maximum |
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| 108 | fmax_ijk_l = MAXLOC( ar ) |
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| 109 | fmax_ijk_l(1) = i1 + fmax_ijk_l(1) - nbgp ! MAXLOC assumes lowerbound = 1 |
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| 110 | fmax_ijk_l(2) = j1 + fmax_ijk_l(2) - nbgp |
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| 111 | fmax_ijk_l(3) = k1 + fmax_ijk_l(3) - 1 |
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| 112 | fmax_l(1) = ar(fmax_ijk_l(1),fmax_ijk_l(2),fmax_ijk_l(3)) |
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| 113 | |
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| 114 | #if defined( __parallel ) |
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| 115 | fmax_l(2) = myid |
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| 116 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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| 117 | CALL MPI_ALLREDUCE( fmax_l, fmax, 1, MPI_2REAL, MPI_MAXLOC, comm2d, & |
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| 118 | ierr ) |
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| 119 | |
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| 120 | ! |
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| 121 | !-- Determine the global maximum. Result stored on PE0. |
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| 122 | id_fmax = fmax(2) |
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| 123 | IF ( id_fmax /= 0 ) THEN |
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| 124 | IF ( myid == 0 ) THEN |
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| 125 | CALL MPI_RECV( fmax_ijk, 3, MPI_INTEGER, id_fmax, 0, comm2d, & |
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| 126 | status, ierr ) |
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| 127 | ELSEIF ( myid == id_fmax ) THEN |
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| 128 | CALL MPI_SEND( fmax_ijk_l, 3, MPI_INTEGER, 0, 0, comm2d, ierr ) |
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| 129 | ENDIF |
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| 130 | ELSE |
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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 | !-- send the indices of the just determined array maximum to other PEs |
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| 135 | CALL MPI_BCAST( fmax_ijk, 3, MPI_INTEGER, 0, comm2d, ierr ) |
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| 136 | #else |
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| 137 | fmax(1) = fmax_l(1) |
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| 138 | fmax_ijk = fmax_ijk_l |
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| 139 | #endif |
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| 140 | |
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| 141 | ENDIF |
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| 142 | |
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| 143 | ! |
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| 144 | !-- Determine absolute array maximum |
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| 145 | IF ( mode == 'abs' ) THEN |
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| 146 | |
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| 147 | ! |
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| 148 | !-- Determine the local absolut maximum |
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| 149 | fmax_l(1) = 0.0 |
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| 150 | fmax_ijk_l(1) = i1 |
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| 151 | fmax_ijk_l(2) = j1 |
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| 152 | fmax_ijk_l(3) = k1 |
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| 153 | DO k = k1, k2 |
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| 154 | DO j = j1, j2 |
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| 155 | DO i = i1, i2 |
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| 156 | IF ( ABS( ar(i,j,k) ) > fmax_l(1) ) THEN |
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| 157 | fmax_l(1) = ABS( ar(i,j,k) ) |
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| 158 | fmax_ijk_l(1) = i |
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| 159 | fmax_ijk_l(2) = j |
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| 160 | fmax_ijk_l(3) = k |
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| 161 | ENDIF |
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| 162 | ENDDO |
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| 163 | ENDDO |
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| 164 | ENDDO |
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| 165 | |
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| 166 | ! |
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| 167 | !-- Set a flag in case that the determined value is negative. |
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| 168 | !-- A constant offset has to be subtracted in order to handle the special |
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| 169 | !-- case i=0 correctly |
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| 170 | IF ( ar(fmax_ijk_l(1),fmax_ijk_l(2),fmax_ijk_l(3)) < 0.0 ) THEN |
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| 171 | fmax_ijk_l(1) = -fmax_ijk_l(1) - 10 |
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| 172 | ENDIF |
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| 173 | |
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| 174 | #if defined( __parallel ) |
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| 175 | fmax_l(2) = myid |
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| 176 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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| 177 | CALL MPI_ALLREDUCE( fmax_l, fmax, 1, MPI_2REAL, MPI_MAXLOC, comm2d, & |
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| 178 | ierr ) |
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| 179 | |
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| 180 | ! |
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| 181 | !-- Determine the global absolut maximum. Result stored on PE0. |
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| 182 | id_fmax = fmax(2) |
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| 183 | IF ( id_fmax /= 0 ) THEN |
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| 184 | IF ( myid == 0 ) THEN |
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| 185 | CALL MPI_RECV( fmax_ijk, 3, MPI_INTEGER, id_fmax, 0, comm2d, & |
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| 186 | status, ierr ) |
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| 187 | ELSEIF ( myid == id_fmax ) THEN |
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| 188 | CALL MPI_SEND( fmax_ijk_l, 3, MPI_INTEGER, 0, 0, comm2d, ierr ) |
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| 189 | ENDIF |
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| 190 | ELSE |
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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 | !-- Send the indices of the just determined absolut maximum to other PEs |
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| 195 | CALL MPI_BCAST( fmax_ijk, 3, MPI_INTEGER, 0, comm2d, ierr ) |
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| 196 | #else |
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| 197 | fmax(1) = fmax_l(1) |
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| 198 | fmax_ijk = fmax_ijk_l |
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| 199 | #endif |
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| 200 | |
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| 201 | ENDIF |
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| 202 | |
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| 203 | ! |
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| 204 | !-- Determine absolute maximum of ( array - offset ) |
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| 205 | IF ( mode == 'absoff' ) THEN |
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| 206 | |
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| 207 | ! |
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| 208 | !-- Determine the local absolut maximum |
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| 209 | fmax_l(1) = 0.0 |
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| 210 | fmax_ijk_l(1) = i1 |
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| 211 | fmax_ijk_l(2) = j1 |
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| 212 | fmax_ijk_l(3) = k1 |
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| 213 | DO k = k1, k2 |
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| 214 | DO j = j1, j2 |
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| 215 | ! |
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| 216 | !-- Attention: the lowest gridpoint is excluded here, because there |
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| 217 | !-- --------- is no advection at nzb=0 and mode 'absoff' is only |
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| 218 | !-- used for calculating u,v extrema for CFL-criteria |
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| 219 | DO i = i1+1, i2 |
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| 220 | IF ( ABS( ar(i,j,k) - offset ) > fmax_l(1) ) THEN |
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| 221 | fmax_l(1) = ABS( ar(i,j,k) - offset ) |
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| 222 | fmax_ijk_l(1) = i |
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| 223 | fmax_ijk_l(2) = j |
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| 224 | fmax_ijk_l(3) = k |
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| 225 | ENDIF |
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| 226 | ENDDO |
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| 227 | ENDDO |
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| 228 | ENDDO |
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| 229 | |
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| 230 | ! |
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| 231 | !-- Set a flag in case that the determined value is negative. |
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| 232 | !-- A constant offset has to be subtracted in order to handle the special |
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| 233 | !-- case i=0 correctly |
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| 234 | IF ( ar(fmax_ijk_l(1),fmax_ijk_l(2),fmax_ijk_l(3)) < 0.0 ) THEN |
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| 235 | fmax_ijk_l(1) = -fmax_ijk_l(1) - 10 |
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| 236 | ENDIF |
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| 237 | |
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| 238 | #if defined( __parallel ) |
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| 239 | fmax_l(2) = myid |
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| 240 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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| 241 | CALL MPI_ALLREDUCE( fmax_l, fmax, 1, MPI_2REAL, MPI_MAXLOC, comm2d, & |
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| 242 | ierr ) |
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| 243 | |
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| 244 | ! |
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| 245 | !-- Determine the global absolut maximum. Result stored on PE0. |
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| 246 | id_fmax = fmax(2) |
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| 247 | IF ( id_fmax /= 0 ) THEN |
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| 248 | IF ( myid == 0 ) THEN |
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| 249 | CALL MPI_RECV( fmax_ijk, 3, MPI_INTEGER, id_fmax, 0, comm2d, & |
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| 250 | status, ierr ) |
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| 251 | ELSEIF ( myid == id_fmax ) THEN |
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| 252 | CALL MPI_SEND( fmax_ijk_l, 3, MPI_INTEGER, 0, 0, comm2d, ierr ) |
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| 253 | ENDIF |
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| 254 | ELSE |
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| 255 | fmax_ijk = fmax_ijk_l |
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| 256 | ENDIF |
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| 257 | ! |
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| 258 | !-- Send the indices of the just determined absolut maximum to other PEs |
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| 259 | CALL MPI_BCAST( fmax_ijk, 3, MPI_INTEGER, 0, comm2d, ierr ) |
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| 260 | #else |
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| 261 | fmax(1) = fmax_l(1) |
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| 262 | fmax_ijk = fmax_ijk_l |
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| 263 | #endif |
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| 264 | |
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| 265 | ENDIF |
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| 266 | |
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| 267 | ! |
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| 268 | !-- Determine output parameters |
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| 269 | SELECT CASE( mode ) |
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| 270 | |
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| 271 | CASE( 'min' ) |
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| 272 | |
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| 273 | value = fmin(1) |
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| 274 | value_ijk = fmin_ijk |
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| 275 | |
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| 276 | CASE( 'max' ) |
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| 277 | |
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| 278 | value = fmax(1) |
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| 279 | value_ijk = fmax_ijk |
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| 280 | |
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| 281 | CASE( 'minmax' ) |
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| 282 | |
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| 283 | value = fmin(1) |
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| 284 | value_ijk = fmin_ijk |
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| 285 | value1 = fmax(1) |
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| 286 | value1_ijk = fmax_ijk |
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| 287 | |
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| 288 | CASE( 'abs', 'absoff' ) |
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| 289 | |
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| 290 | value = fmax(1) |
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| 291 | value_ijk = fmax_ijk |
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| 292 | IF ( fmax_ijk(1) < 0 ) THEN |
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| 293 | value = -value |
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| 294 | value_ijk(1) = -value_ijk(1) - 10 !??? |
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| 295 | ENDIF |
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| 296 | |
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| 297 | END SELECT |
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| 298 | |
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| 299 | ! |
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| 300 | !-- Limit index values to the range 0..nx, 0..ny |
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| 301 | IF ( value_ijk(3) < 0 ) value_ijk(3) = nx +1 + value_ijk(3) |
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| 302 | IF ( value_ijk(3) > nx ) value_ijk(3) = value_ijk(3) - (nx+1) |
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| 303 | IF ( value_ijk(2) < 0 ) value_ijk(2) = ny +1 + value_ijk(2) |
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| 304 | IF ( value_ijk(2) > ny ) value_ijk(2) = value_ijk(2) - (ny+1) |
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| 305 | |
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| 306 | |
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| 307 | END SUBROUTINE global_min_max |
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