1 | !> @file init_coupling.f90 |
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2 | !------------------------------------------------------------------------------! |
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3 | ! This file is part of the PALM model system. |
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4 | ! |
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5 | ! PALM is free software: you can redistribute it and/or modify it under the |
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6 | ! terms of the GNU General Public License as published by the Free Software |
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7 | ! Foundation, either version 3 of the License, or (at your option) any later |
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8 | ! version. |
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9 | ! |
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10 | ! PALM is distributed in the hope that it will be useful, but WITHOUT ANY |
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11 | ! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR |
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12 | ! A PARTICULAR PURPOSE. See the GNU General Public License for more details. |
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13 | ! |
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14 | ! You should have received a copy of the GNU General Public License along with |
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15 | ! PALM. If not, see <http://www.gnu.org/licenses/>. |
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16 | ! |
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17 | ! Copyright 1997-2020 Leibniz Universitaet Hannover |
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18 | !------------------------------------------------------------------------------! |
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19 | ! |
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20 | ! Current revisions: |
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21 | ! ----------------- |
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22 | ! |
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23 | ! |
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24 | ! Former revisions: |
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25 | ! ------------------ |
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26 | ! $Id: init_coupling.f90 4564 2020-06-12 14:03:36Z suehring $ |
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27 | ! Vertical nesting method of Huq et al. (2019) removed |
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28 | ! |
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29 | ! 4444 2020-03-05 15:59:50Z raasch |
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30 | ! bugfix: cpp-directives for serial mode added |
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31 | ! |
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32 | ! 4360 2020-01-07 11:25:50Z suehring |
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33 | ! Corrected "Former revisions" section |
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34 | ! |
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35 | ! 3655 2019-01-07 16:51:22Z knoop |
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36 | ! references to mrun replaced by palmrun, and updated |
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37 | ! |
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38 | ! 222 2009-01-12 16:04:16Z letzel |
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39 | ! Initial revision |
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40 | ! |
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41 | ! Description: |
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42 | ! ------------ |
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43 | !> Initializing coupling via MPI-1 or MPI-2 if the coupled version of PALM is |
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44 | !> called. |
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45 | !------------------------------------------------------------------------------! |
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46 | SUBROUTINE init_coupling |
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47 | |
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48 | |
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49 | USE control_parameters, & |
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50 | ONLY: coupling_char, coupling_mode |
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51 | |
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52 | USE kinds |
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53 | |
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54 | USE pegrid |
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55 | |
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56 | IMPLICIT NONE |
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57 | |
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58 | ! |
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59 | !-- Local variables |
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60 | #if defined( __parallel ) |
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61 | INTEGER(iwp) :: i !< |
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62 | INTEGER(iwp) :: inter_color !< |
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63 | #endif |
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64 | |
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65 | INTEGER(iwp), DIMENSION(:) :: bc_data(0:3) = 0 !< |
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66 | |
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67 | ! |
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68 | !-- Get information about the coupling mode from the environment variable |
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69 | !-- which has been set by the mpiexec command. |
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70 | !-- This method is currently not used because the mpiexec command is not |
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71 | !-- available on some machines |
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72 | ! CALL GET_ENVIRONMENT_VARIABLE( 'coupling_mode', coupling_mode, i ) |
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73 | ! IF ( i == 0 ) coupling_mode = 'uncoupled' |
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74 | ! IF ( coupling_mode == 'ocean_to_atmosphere' ) coupling_char = '_O' |
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75 | |
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76 | ! |
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77 | !-- Get information about the coupling mode from standard input (PE0 only) and |
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78 | !-- distribute it to the other PEs. Distribute PEs to 2 new communicators. |
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79 | !-- ATTENTION: numprocs will be reset according to the new communicators |
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80 | #if defined ( __parallel ) |
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81 | |
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82 | IF ( myid == 0 ) THEN |
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83 | READ (*,*,ERR=10,END=10) coupling_mode, bc_data(1), bc_data(2) |
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84 | 10 CONTINUE |
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85 | IF ( TRIM( coupling_mode ) == 'coupled_run' ) THEN |
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86 | i = 1 |
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87 | ELSE |
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88 | i = 0 |
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89 | ENDIF |
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90 | bc_data(0) = i |
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91 | |
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92 | ! |
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93 | !-- Check if '_O' has to be used as file extension in an uncoupled ocean |
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94 | !-- run. This is required, if this run shall be continued as a coupled run. |
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95 | IF ( TRIM( coupling_mode ) == 'precursor_ocean' ) bc_data(3) = 1 |
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96 | |
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97 | ENDIF |
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98 | |
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99 | CALL MPI_BCAST( bc_data(0), 4, MPI_INTEGER, 0, MPI_COMM_WORLD, ierr ) |
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100 | i = bc_data(0) |
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101 | |
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102 | IF ( i == 0 ) THEN |
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103 | coupling_mode = 'uncoupled' |
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104 | ! |
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105 | !-- In case of a precursor ocean run, an additional flag file is created. |
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106 | !-- This is necessary for data_output_2d_on_each_pe = .T. |
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107 | IF ( bc_data(3) == 1 ) THEN |
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108 | OPEN( 90, FILE='PRECURSOR_OCEAN', FORM='FORMATTED' ) |
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109 | WRITE ( 90, '(''TRUE'')' ) |
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110 | CLOSE ( 90 ) |
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111 | ENDIF |
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112 | ELSE |
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113 | comm_inter = MPI_COMM_WORLD |
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114 | |
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115 | IF ( myid < bc_data(1) ) THEN |
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116 | inter_color = 0 |
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117 | numprocs = bc_data(1) |
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118 | coupling_mode = 'atmosphere_to_ocean' |
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119 | ELSE |
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120 | inter_color = 1 |
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121 | numprocs = bc_data(2) |
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122 | coupling_mode = 'ocean_to_atmosphere' |
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123 | ENDIF |
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124 | |
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125 | CALL MPI_COMM_SPLIT( MPI_COMM_WORLD, inter_color, 0, comm_palm, ierr ) |
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126 | comm2d = comm_palm |
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127 | |
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128 | ! |
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129 | !-- Write a flag file for the ocean model and the other atmosphere |
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130 | !-- processes. |
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131 | OPEN( 90, FILE='COUPLING_PORT_OPENED', FORM='FORMATTED' ) |
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132 | WRITE ( 90, '(''TRUE'')' ) |
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133 | CLOSE ( 90 ) |
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134 | ENDIF |
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135 | #endif |
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136 | |
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137 | ! |
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138 | !-- In case of a precursor ocean run (followed by a coupled run), or a |
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139 | !-- coupled atmosphere-ocean run, set the file extension for the ocean files |
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140 | IF ( TRIM( coupling_mode ) == 'ocean_to_atmosphere' .OR. bc_data(3) == 1 ) & |
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141 | THEN |
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142 | coupling_char = '_O' |
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143 | ENDIF |
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144 | |
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145 | END SUBROUTINE init_coupling |
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