1 | #include "cppdefs.h"
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2 | MODULE mod_parallel
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3 | !
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4 | !svn $Id: mod_parallel.F 29 2007-04-23 19:23:26Z arango $
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5 | !================================================== Hernan G. Arango ===
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6 | ! Copyright (c) 2002-2007 The ROMS/TOMS Group !
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7 | ! Licensed under a MIT/X style license !
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8 | ! See License_ROMS.txt !
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9 | !=======================================================================
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10 | ! !
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11 | ! This module contains all variables used for parallelization !
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12 | ! !
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13 | !=======================================================================
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14 | !
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15 | USE mod_param
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16 | USE mod_strings, ONLY: Nregion
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17 | !
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18 | implicit none
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19 |
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20 | #ifdef MPI
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21 | include 'mpif.h'
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22 | #endif
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23 | !
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24 | ! Switch to identify master processor. In serial and shared-memory
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25 | ! applications it is always true.
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26 | !
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27 | logical :: Master
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28 | !
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29 | ! Switch to identify which thread is processing input/output files.
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30 | ! In distributed-memory applications, this thread can be the master
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31 | ! thread or all threads in case of parallel output. In serial and
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32 | ! shared-memory applications it is always true.
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33 | !
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34 | logical :: InpThread
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35 | logical :: OutThread
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36 | !
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37 | ! Number of shared-memory parallel threads. In distributed memory
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38 | ! configurations, its value must be equal to one.
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39 | !
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40 | integer :: numthreads = 1
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41 | !
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42 | ! Number distributed memory nodes.
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43 | !
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44 | integer :: numnodes = 0
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45 |
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46 | #ifdef AIR_OCEAN
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47 | !
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48 | ! Parallel nodes assined to the atmosphere model.
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49 | !
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50 | integer :: peATM_frst ! first atmosphere parallel node
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51 | integer :: peATM_last ! last atmosphere parallel node
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52 | #endif
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53 | #ifdef WAVES_OCEAN
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54 | !
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55 | ! Parallel nodes assined to the wave model.
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56 | !
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57 | integer :: peWAV_frst ! first atmosphere parallel node
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58 | integer :: peWAV_last ! last atmosphere parallel node
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59 | #endif
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60 | !
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61 | ! Parallel nodes assined to the ocean model.
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62 | !
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63 | integer :: peOCN_frst ! first ocean parallel node
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64 | integer :: peOCN_last ! last ocean parallel node
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65 | !
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66 | ! Parallel threads/nodes counters used in critical parallel regions.
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67 | !
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68 | integer :: tile_count = 0
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69 | integer :: block_count = 0
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70 | integer :: thread_count = 0
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71 | !
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72 | ! Profiling variables as function of parallel thread:
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73 | !
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74 | ! proc Parallel process ID.
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75 | ! Cstr Starting time for program region.
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76 | ! Cend Ending time for program region.
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77 | ! Csum Accumulated time for progam region.
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78 | !
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79 | integer :: proc(0:1,7,Ngrids)
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80 |
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81 | real(r8) :: Cstr(0:Nregion,7,Ngrids)
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82 | real(r8) :: Cend(0:Nregion,7,Ngrids)
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83 | real(r8) :: Csum(0:Nregion,7,Ngrids)
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84 |
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85 | #ifdef _OPENMP
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86 | common /process/ proc
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87 | !$OMP THREADPRIVATE (/process/)
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88 |
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89 | common /wallclock/ Cstr, Cend
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90 | !$OMP THREADPRIVATE (/wallclock/)
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91 | #endif
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92 | !
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93 | ! Distributed-memory master process and rank of the local process.
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94 | !
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95 | integer, parameter :: MyMaster = 0
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96 | integer :: MyRank = 0
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97 |
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98 | #ifdef DISTRIBUTE
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99 | # ifdef MPI
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100 | !
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101 | ! Ocean model MPI group communicator handle.
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102 | !
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103 | integer :: OCN_COMM_WORLD
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104 | # endif
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105 | !
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106 | ! Type of message-passage floating point bindings.
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107 | !
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108 | # ifdef DOUBLE_PRECISION
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109 | # ifdef MPI
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110 | integer, parameter :: MP_FLOAT = MPI_DOUBLE_PRECISION
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111 | !! integer, parameter :: MP_FLOAT = MPI_REAL8
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112 | # endif
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113 | # else
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114 | # ifdef MPI
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115 | integer, parameter :: MP_FLOAT = MPI_REAL
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116 | !! integer, parameter :: MP_FLOAT = MPI_REAL4
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117 | # endif
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118 | # endif
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119 | #endif
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120 |
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121 | CONTAINS
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122 |
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123 | SUBROUTINE initialize_parallel
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124 | !
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125 | !=======================================================================
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126 | ! !
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127 | ! This routine initializes and spawn distribute-memory nodes. !
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128 | ! !
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129 | !=======================================================================
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130 | !
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131 | USE mod_param
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132 | USE mod_iounits
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133 | USE mod_scalars
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134 | USE mod_strings, ONLY: Nregion
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135 | !
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136 | ! Local variable declarations.
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137 | !
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138 | integer :: i
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139 | #ifdef DISTRIBUTE
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140 | integer :: MyError
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141 | #endif
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142 | #ifndef DISTRIBUTE
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143 | integer :: my_numthreads
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144 | !
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145 | !-----------------------------------------------------------------------
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146 | ! Initialize shared-memory (OpenMP) or serial configuration.
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147 | !-----------------------------------------------------------------------
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148 | !
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149 | ! Inquire number of threads in parallel region.
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150 | !
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151 | numthreads=my_numthreads()
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152 | Master=.TRUE.
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153 | InpThread=.TRUE.
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154 | OutThread=.TRUE.
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155 | #endif
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156 | #ifdef DISTRIBUTE
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157 | # ifdef MPI
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158 | !
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159 | !-----------------------------------------------------------------------
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160 | ! Initialize distributed-memory (MPI) configuration.
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161 | !-----------------------------------------------------------------------
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162 | !
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163 | ! Get the number of processes in the group associated with the world
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164 | ! communicator.
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165 | !
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166 | numthreads=1
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167 | CALL mpi_comm_size (OCN_COMM_WORLD, numnodes, MyError)
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168 | IF (MyError.ne.0) THEN
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169 | WRITE (stdout,10)
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170 | 10 FORMAT (/,' ROMS/TOMS - Unable to inquire number of', &
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171 | & ' processors in the group.')
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172 | exit_flag=6
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173 | RETURN
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174 | END IF
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175 | !
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176 | ! Identify master thread and output thread.
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177 | !
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178 | Master=.FALSE.
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179 | InpThread=.FALSE.
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180 | OutThread=.FALSE.
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181 | IF (MyRank.eq.MyMaster) THEN
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182 | Master=.TRUE.
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183 | InpThread=.TRUE.
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184 | OutThread=.TRUE.
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185 | END IF
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186 | # endif
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187 | #endif
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188 | !
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189 | !-----------------------------------------------------------------------
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190 | ! Initialize profiling variables.
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191 | !-----------------------------------------------------------------------
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192 | !
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193 | proc(0:1,1:7,1:Ngrids)=0
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194 | Cstr(0:Nregion,1:7,1:Ngrids)=0.0_r8
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195 | Cend(0:Nregion,1:7,1:Ngrids)=0.0_r8
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196 | Csum(0:Nregion,1:7,1:Ngrids)=0.0_r8
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197 |
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198 | RETURN
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199 | END SUBROUTINE initialize_parallel
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200 | END MODULE mod_parallel
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