[866] | 1 | SUBROUTINE global_min_max( i1, i2, j1, j2, k1, k2, ar, mode, offset, value, & |
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[1] | 2 | value_ijk, value1, value1_ijk ) |
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| 3 | |
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[623] | 4 | !------------------------------------------------------------------------------! |
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[484] | 5 | ! Current revisions: |
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[866] | 6 | ! ------------------ |
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| 7 | ! new mode "absoff" accounts for an offset in the respective array |
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[1] | 8 | ! |
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| 9 | ! Former revisions: |
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| 10 | ! ----------------- |
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[3] | 11 | ! $Id: global_min_max.f90 866 2012-03-28 06:44:41Z raasch $ |
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[623] | 12 | ! |
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[668] | 13 | ! 667 2010-12-23 12:06:00Z suehring/gryschka |
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| 14 | ! Adapting of the index arrays, because MINLOC assumes lowerbound at 1 and not |
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| 15 | ! at nbgp. |
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| 16 | ! |
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[623] | 17 | ! 622 2010-12-10 08:08:13Z raasch |
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| 18 | ! optional barriers included in order to speed up collective operations |
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| 19 | ! |
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| 20 | ! Feb. 2007 |
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[3] | 21 | ! RCS Log replace by Id keyword, revision history cleaned up |
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| 22 | ! |
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[1] | 23 | ! Revision 1.11 2003/04/16 12:56:58 raasch |
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| 24 | ! Index values of the extrema are limited to the range 0..nx, 0..ny |
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| 25 | ! |
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| 26 | ! Revision 1.1 1997/07/24 11:14:03 raasch |
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| 27 | ! Initial revision |
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| 28 | ! |
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| 29 | ! |
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| 30 | ! Description: |
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| 31 | ! ------------ |
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| 32 | ! Determine the array minimum/maximum and the corresponding indices. |
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[623] | 33 | !------------------------------------------------------------------------------! |
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[1] | 34 | |
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| 35 | USE indices |
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| 36 | USE pegrid |
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| 37 | |
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| 38 | IMPLICIT NONE |
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| 39 | |
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| 40 | CHARACTER (LEN=*) :: mode |
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| 41 | |
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| 42 | INTEGER :: i, i1, i2, id_fmax, id_fmin, j, j1, j2, k, k1, k2, & |
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| 43 | fmax_ijk(3), fmax_ijk_l(3), fmin_ijk(3), & |
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| 44 | fmin_ijk_l(3), value_ijk(3) |
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| 45 | INTEGER, OPTIONAL :: value1_ijk(3) |
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[866] | 46 | REAL :: offset, value, & |
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[1] | 47 | ar(i1:i2,j1:j2,k1:k2) |
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| 48 | #if defined( __ibm ) |
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| 49 | REAL (KIND=4) :: fmax(2), fmax_l(2), fmin(2), fmin_l(2) ! on 32bit- |
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| 50 | ! machines MPI_2REAL must not be replaced by |
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| 51 | ! MPI_2DOUBLE_PRECISION |
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| 52 | #else |
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| 53 | REAL :: fmax(2), fmax_l(2), fmin(2), fmin_l(2) |
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| 54 | #endif |
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| 55 | REAL, OPTIONAL :: value1 |
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| 56 | |
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| 57 | |
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| 58 | ! |
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| 59 | !-- Determine array minimum |
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| 60 | IF ( mode == 'min' .OR. mode == 'minmax' ) THEN |
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| 61 | |
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| 62 | ! |
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| 63 | !-- Determine the local minimum |
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| 64 | fmin_ijk_l = MINLOC( ar ) |
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[866] | 65 | fmin_ijk_l(1) = i1 + fmin_ijk_l(1) - nbgp ! MINLOC assumes lowerbound = 1 |
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[667] | 66 | fmin_ijk_l(2) = j1 + fmin_ijk_l(2) - nbgp |
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[1] | 67 | fmin_ijk_l(3) = k1 + fmin_ijk_l(3) - 1 |
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| 68 | fmin_l(1) = ar(fmin_ijk_l(1),fmin_ijk_l(2),fmin_ijk_l(3)) |
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| 69 | |
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| 70 | #if defined( __parallel ) |
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| 71 | fmin_l(2) = myid |
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[622] | 72 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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[623] | 73 | CALL MPI_ALLREDUCE( fmin_l, fmin, 1, MPI_2REAL, MPI_MINLOC, comm2d, & |
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| 74 | ierr ) |
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[1] | 75 | |
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| 76 | ! |
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| 77 | !-- Determine the global minimum. Result stored on PE0. |
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| 78 | id_fmin = fmin(2) |
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| 79 | IF ( id_fmin /= 0 ) THEN |
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| 80 | IF ( myid == 0 ) THEN |
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| 81 | CALL MPI_RECV( fmin_ijk, 3, MPI_INTEGER, id_fmin, 0, comm2d, & |
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| 82 | status, ierr ) |
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| 83 | ELSEIF ( myid == id_fmin ) THEN |
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| 84 | CALL MPI_SEND( fmin_ijk_l, 3, MPI_INTEGER, 0, 0, comm2d, ierr ) |
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| 85 | ENDIF |
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| 86 | ELSE |
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| 87 | fmin_ijk = fmin_ijk_l |
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| 88 | ENDIF |
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| 89 | ! |
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| 90 | !-- Send the indices of the just determined array minimum to other PEs |
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| 91 | CALL MPI_BCAST( fmin_ijk, 3, MPI_INTEGER, 0, comm2d, ierr ) |
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| 92 | #else |
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| 93 | fmin(1) = fmin_l(1) |
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| 94 | fmin_ijk = fmin_ijk_l |
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| 95 | #endif |
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| 96 | |
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| 97 | ENDIF |
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| 98 | |
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| 99 | ! |
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| 100 | !-- Determine array maximum |
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| 101 | IF ( mode == 'max' .OR. mode == 'minmax' ) THEN |
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| 102 | |
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| 103 | ! |
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| 104 | !-- Determine the local maximum |
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| 105 | fmax_ijk_l = MAXLOC( ar ) |
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[866] | 106 | fmax_ijk_l(1) = i1 + fmax_ijk_l(1) - nbgp ! MAXLOC assumes lowerbound = 1 |
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[667] | 107 | fmax_ijk_l(2) = j1 + fmax_ijk_l(2) - nbgp |
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[1] | 108 | fmax_ijk_l(3) = k1 + fmax_ijk_l(3) - 1 |
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| 109 | fmax_l(1) = ar(fmax_ijk_l(1),fmax_ijk_l(2),fmax_ijk_l(3)) |
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| 110 | |
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| 111 | #if defined( __parallel ) |
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| 112 | fmax_l(2) = myid |
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[622] | 113 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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[623] | 114 | CALL MPI_ALLREDUCE( fmax_l, fmax, 1, MPI_2REAL, MPI_MAXLOC, comm2d, & |
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| 115 | ierr ) |
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[1] | 116 | |
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| 117 | ! |
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| 118 | !-- Determine the global maximum. Result stored on PE0. |
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| 119 | id_fmax = fmax(2) |
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| 120 | IF ( id_fmax /= 0 ) THEN |
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| 121 | IF ( myid == 0 ) THEN |
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| 122 | CALL MPI_RECV( fmax_ijk, 3, MPI_INTEGER, id_fmax, 0, comm2d, & |
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| 123 | status, ierr ) |
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| 124 | ELSEIF ( myid == id_fmax ) THEN |
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| 125 | CALL MPI_SEND( fmax_ijk_l, 3, MPI_INTEGER, 0, 0, comm2d, ierr ) |
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| 126 | ENDIF |
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| 127 | ELSE |
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| 128 | fmax_ijk = fmax_ijk_l |
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| 129 | ENDIF |
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| 130 | ! |
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| 131 | !-- send the indices of the just determined array maximum to other PEs |
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| 132 | CALL MPI_BCAST( fmax_ijk, 3, MPI_INTEGER, 0, comm2d, ierr ) |
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| 133 | #else |
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| 134 | fmax(1) = fmax_l(1) |
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| 135 | fmax_ijk = fmax_ijk_l |
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| 136 | #endif |
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| 137 | |
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| 138 | ENDIF |
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| 139 | |
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| 140 | ! |
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| 141 | !-- Determine absolute array maximum |
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| 142 | IF ( mode == 'abs' ) THEN |
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| 143 | |
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| 144 | ! |
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| 145 | !-- Determine the local absolut maximum |
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| 146 | fmax_l(1) = 0.0 |
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| 147 | fmax_ijk_l(1) = i1 |
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| 148 | fmax_ijk_l(2) = j1 |
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| 149 | fmax_ijk_l(3) = k1 |
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| 150 | DO k = k1, k2 |
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| 151 | DO j = j1, j2 |
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| 152 | DO i = i1, i2 |
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| 153 | IF ( ABS( ar(i,j,k) ) > fmax_l(1) ) THEN |
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| 154 | fmax_l(1) = ABS( ar(i,j,k) ) |
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| 155 | fmax_ijk_l(1) = i |
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| 156 | fmax_ijk_l(2) = j |
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| 157 | fmax_ijk_l(3) = k |
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| 158 | ENDIF |
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| 159 | ENDDO |
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| 160 | ENDDO |
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| 161 | ENDDO |
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| 162 | |
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| 163 | ! |
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| 164 | !-- Set a flag in case that the determined value is negative. |
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| 165 | !-- A constant offset has to be subtracted in order to handle the special |
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| 166 | !-- case i=0 correctly |
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| 167 | IF ( ar(fmax_ijk_l(1),fmax_ijk_l(2),fmax_ijk_l(3)) < 0.0 ) THEN |
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| 168 | fmax_ijk_l(1) = -fmax_ijk_l(1) - 10 |
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| 169 | ENDIF |
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| 170 | |
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| 171 | #if defined( __parallel ) |
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| 172 | fmax_l(2) = myid |
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[622] | 173 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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[1] | 174 | CALL MPI_ALLREDUCE( fmax_l, fmax, 1, MPI_2REAL, MPI_MAXLOC, comm2d, & |
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| 175 | ierr ) |
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| 176 | |
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| 177 | ! |
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| 178 | !-- Determine the global absolut maximum. Result stored on PE0. |
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| 179 | id_fmax = fmax(2) |
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| 180 | IF ( id_fmax /= 0 ) THEN |
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| 181 | IF ( myid == 0 ) THEN |
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| 182 | CALL MPI_RECV( fmax_ijk, 3, MPI_INTEGER, id_fmax, 0, comm2d, & |
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| 183 | status, ierr ) |
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| 184 | ELSEIF ( myid == id_fmax ) THEN |
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| 185 | CALL MPI_SEND( fmax_ijk_l, 3, MPI_INTEGER, 0, 0, comm2d, ierr ) |
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| 186 | ENDIF |
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| 187 | ELSE |
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| 188 | fmax_ijk = fmax_ijk_l |
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| 189 | ENDIF |
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| 190 | ! |
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| 191 | !-- Send the indices of the just determined absolut maximum to other PEs |
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| 192 | CALL MPI_BCAST( fmax_ijk, 3, MPI_INTEGER, 0, comm2d, ierr ) |
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| 193 | #else |
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| 194 | fmax(1) = fmax_l(1) |
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| 195 | fmax_ijk = fmax_ijk_l |
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| 196 | #endif |
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| 197 | |
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| 198 | ENDIF |
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| 199 | |
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| 200 | ! |
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[866] | 201 | !-- Determine absolute maximum of ( array - offset ) |
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| 202 | IF ( mode == 'absoff' ) THEN |
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| 203 | |
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| 204 | ! |
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| 205 | !-- Determine the local absolut maximum |
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| 206 | fmax_l(1) = 0.0 |
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| 207 | fmax_ijk_l(1) = i1 |
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| 208 | fmax_ijk_l(2) = j1 |
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| 209 | fmax_ijk_l(3) = k1 |
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| 210 | DO k = k1, k2 |
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| 211 | DO j = j1, j2 |
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| 212 | ! |
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| 213 | !-- Attention: the lowest gridpoint is excluded here, because there |
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| 214 | !-- --------- is no advection at nzb=0 and mode 'absoff' is only |
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| 215 | !-- used for calculating u,v extrema for CFL-criteria |
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| 216 | DO i = i1+1, i2 |
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| 217 | IF ( ABS( ar(i,j,k) - offset ) > fmax_l(1) ) THEN |
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| 218 | fmax_l(1) = ABS( ar(i,j,k) - offset ) |
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| 219 | fmax_ijk_l(1) = i |
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| 220 | fmax_ijk_l(2) = j |
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| 221 | fmax_ijk_l(3) = k |
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| 222 | ENDIF |
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| 223 | ENDDO |
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| 224 | ENDDO |
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| 225 | ENDDO |
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| 226 | |
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| 227 | ! |
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| 228 | !-- Set a flag in case that the determined value is negative. |
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| 229 | !-- A constant offset has to be subtracted in order to handle the special |
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| 230 | !-- case i=0 correctly |
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| 231 | IF ( ar(fmax_ijk_l(1),fmax_ijk_l(2),fmax_ijk_l(3)) < 0.0 ) THEN |
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| 232 | fmax_ijk_l(1) = -fmax_ijk_l(1) - 10 |
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| 233 | ENDIF |
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| 234 | |
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| 235 | #if defined( __parallel ) |
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| 236 | fmax_l(2) = myid |
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| 237 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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| 238 | CALL MPI_ALLREDUCE( fmax_l, fmax, 1, MPI_2REAL, MPI_MAXLOC, comm2d, & |
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| 239 | ierr ) |
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| 240 | |
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| 241 | ! |
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| 242 | !-- Determine the global absolut maximum. Result stored on PE0. |
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| 243 | id_fmax = fmax(2) |
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| 244 | IF ( id_fmax /= 0 ) THEN |
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| 245 | IF ( myid == 0 ) THEN |
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| 246 | CALL MPI_RECV( fmax_ijk, 3, MPI_INTEGER, id_fmax, 0, comm2d, & |
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| 247 | status, ierr ) |
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| 248 | ELSEIF ( myid == id_fmax ) THEN |
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| 249 | CALL MPI_SEND( fmax_ijk_l, 3, MPI_INTEGER, 0, 0, comm2d, ierr ) |
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| 250 | ENDIF |
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| 251 | ELSE |
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| 252 | fmax_ijk = fmax_ijk_l |
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| 253 | ENDIF |
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| 254 | ! |
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| 255 | !-- Send the indices of the just determined absolut maximum to other PEs |
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| 256 | CALL MPI_BCAST( fmax_ijk, 3, MPI_INTEGER, 0, comm2d, ierr ) |
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| 257 | #else |
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| 258 | fmax(1) = fmax_l(1) |
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| 259 | fmax_ijk = fmax_ijk_l |
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| 260 | #endif |
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| 261 | |
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| 262 | ENDIF |
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| 263 | |
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| 264 | ! |
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[1] | 265 | !-- Determine output parameters |
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| 266 | SELECT CASE( mode ) |
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| 267 | |
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| 268 | CASE( 'min' ) |
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| 269 | |
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| 270 | value = fmin(1) |
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| 271 | value_ijk = fmin_ijk |
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| 272 | |
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| 273 | CASE( 'max' ) |
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| 274 | |
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| 275 | value = fmax(1) |
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| 276 | value_ijk = fmax_ijk |
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| 277 | |
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| 278 | CASE( 'minmax' ) |
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| 279 | |
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| 280 | value = fmin(1) |
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| 281 | value_ijk = fmin_ijk |
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| 282 | value1 = fmax(1) |
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| 283 | value1_ijk = fmax_ijk |
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| 284 | |
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[866] | 285 | CASE( 'abs', 'absoff' ) |
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[1] | 286 | |
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| 287 | value = fmax(1) |
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| 288 | value_ijk = fmax_ijk |
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| 289 | IF ( fmax_ijk(1) < 0 ) THEN |
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| 290 | value = -value |
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[667] | 291 | value_ijk(1) = -value_ijk(1) - 10 !??? |
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[1] | 292 | ENDIF |
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| 293 | |
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| 294 | END SELECT |
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| 295 | |
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| 296 | ! |
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| 297 | !-- Limit index values to the range 0..nx, 0..ny |
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[667] | 298 | IF ( value_ijk(3) < 0 ) value_ijk(3) = nx +1 + value_ijk(3) |
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| 299 | IF ( value_ijk(3) > nx ) value_ijk(3) = value_ijk(3) - (nx+1) |
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| 300 | IF ( value_ijk(2) < 0 ) value_ijk(2) = ny +1 + value_ijk(2) |
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| 301 | IF ( value_ijk(2) > ny ) value_ijk(2) = value_ijk(2) - (ny+1) |
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[1] | 302 | |
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| 303 | |
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| 304 | END SUBROUTINE global_min_max |
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