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 letzel $ |
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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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