1 | SUBROUTINE exchange_horiz( ar, nbgp_local) |
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2 | |
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3 | !------------------------------------------------------------------------------! |
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4 | ! Current revisions: |
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5 | ! ----------------- |
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6 | ! |
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7 | ! |
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8 | ! Former revisions: |
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9 | ! ----------------- |
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10 | ! $Id: exchange_horiz.f90 684 2011-02-09 14:49:31Z raasch $ |
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11 | ! |
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12 | ! 683 2011-02-09 14:25:15Z raasch |
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13 | ! optional synchronous exchange (sendrecv) implemented, code partly reformatted |
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14 | ! |
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15 | ! 667 2010-12-23 12:06:00Z suehring/gryschka |
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16 | ! Dynamic exchange of ghost points with nbgp_local to ensure that no useless |
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17 | ! ghost points exchanged in case of multigrid. type_yz(0) and type_xz(0) |
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18 | ! used for normal grid, the remaining types used for the several grid levels. |
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19 | ! Exchange is done via MPI-Vectors with a dynamic value of ghost points which |
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20 | ! depend on the advection scheme. Exchange of left and right PEs is 10% faster |
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21 | ! with MPI-Vectors than without. |
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22 | ! |
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23 | ! 75 2007-03-22 09:54:05Z raasch |
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24 | ! Special cases for additional gridpoints along x or y in case of non-cyclic |
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25 | ! boundary conditions are not regarded any more |
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26 | ! |
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27 | ! RCS Log replace by Id keyword, revision history cleaned up |
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28 | ! |
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29 | ! Revision 1.16 2006/02/23 12:19:08 raasch |
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30 | ! anz_yz renamed ngp_yz |
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31 | ! |
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32 | ! Revision 1.1 1997/07/24 11:13:29 raasch |
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33 | ! Initial revision |
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34 | ! |
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35 | ! |
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36 | ! Description: |
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37 | ! ------------ |
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38 | ! Exchange of lateral boundary values (parallel computers) and cyclic |
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39 | ! lateral boundary conditions, respectively. |
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40 | !------------------------------------------------------------------------------! |
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41 | |
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42 | USE control_parameters |
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43 | USE cpulog |
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44 | USE indices |
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45 | USE interfaces |
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46 | USE pegrid |
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47 | |
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48 | IMPLICIT NONE |
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49 | |
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50 | #if defined( __parallel ) |
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51 | INTEGER, DIMENSION(4) :: req |
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52 | INTEGER, DIMENSION(MPI_STATUS_SIZE,4) :: wait_stat |
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53 | #endif |
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54 | INTEGER :: i, nbgp_local |
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55 | REAL, DIMENSION(nzb:nzt+1,nys-nbgp_local:nyn+nbgp_local, & |
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56 | nxl-nbgp_local:nxr+nbgp_local) :: ar |
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57 | |
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58 | CALL cpu_log( log_point_s(2), 'exchange_horiz', 'start' ) |
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59 | |
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60 | ! |
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61 | !-- In the Poisson multigrid solver arrays with coarser grids are used. |
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62 | !-- Set i appropriately, because the coarser grids have different |
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63 | !-- MPI datatypes type_xz, type_yz. |
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64 | IF ( exchange_mg == .TRUE. ) THEN |
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65 | i = grid_level |
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66 | ELSE |
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67 | i = 0 |
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68 | END IF |
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69 | |
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70 | #if defined( __parallel ) |
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71 | |
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72 | ! |
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73 | !-- Exchange of lateral boundary values for parallel computers |
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74 | IF ( pdims(1) == 1 .OR. mg_switch_to_pe0 ) THEN |
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75 | ! |
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76 | !-- One-dimensional decomposition along y, boundary values can be exchanged |
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77 | !-- within the PE memory |
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78 | IF ( bc_lr == 'cyclic' ) THEN |
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79 | ar(:,:,nxl-nbgp_local:nxl-1) = ar(:,:,nxr-nbgp_local+1:nxr) |
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80 | ar(:,:,nxr+1:nxr+nbgp_local) = ar(:,:,nxl:nxl+nbgp_local-1) |
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81 | ENDIF |
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82 | |
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83 | ELSE |
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84 | |
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85 | IF ( synchronous_exchange ) THEN |
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86 | ! |
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87 | !-- Send left boundary, receive right one (synchronous) |
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88 | CALL MPI_SENDRECV( & |
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89 | ar(nzb,nys-nbgp_local,nxl), 1, type_yz(i), pleft, 0, & |
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90 | ar(nzb,nys-nbgp_local,nxr+1), 1, type_yz(i), pright, 0, & |
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91 | comm2d, status, ierr ) |
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92 | ! |
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93 | !-- Send right boundary, receive left one (synchronous) |
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94 | CALL MPI_SENDRECV( & |
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95 | ar(nzb,nys-nbgp_local,nxr+1-nbgp_local), 1, type_yz(i), pright, 1, & |
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96 | ar(nzb,nys-nbgp_local,nxl-nbgp_local), 1, type_yz(i), pleft, 1, & |
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97 | comm2d, status, ierr ) |
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98 | |
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99 | ELSE |
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100 | |
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101 | req = 0 |
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102 | ! |
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103 | !-- Send left boundary, receive right one (asynchronous) |
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104 | CALL MPI_ISEND( ar(nzb,nys-nbgp_local,nxl), 1, type_yz(i), pleft, & |
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105 | 0, comm2d, req(1), ierr ) |
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106 | CALL MPI_IRECV( ar(nzb,nys-nbgp_local,nxr+1), 1, type_yz(i), pright, & |
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107 | 0, comm2d, req(2), ierr ) |
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108 | ! |
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109 | !-- Send right boundary, receive left one (asynchronous) |
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110 | CALL MPI_ISEND( ar(nzb,nys-nbgp_local,nxr+1-nbgp_local), 1, & |
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111 | type_yz(i), pright, 1, comm2d, req(3), ierr ) |
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112 | CALL MPI_IRECV( ar(nzb,nys-nbgp_local,nxl-nbgp_local), 1, & |
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113 | type_yz(i), pleft, 1, comm2d, req(4), ierr ) |
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114 | |
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115 | CALL MPI_WAITALL( 4, req, wait_stat, ierr ) |
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116 | |
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117 | ENDIF |
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118 | |
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119 | ENDIF |
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120 | |
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121 | |
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122 | IF ( pdims(2) == 1 .OR. mg_switch_to_pe0 ) THEN |
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123 | ! |
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124 | !-- One-dimensional decomposition along x, boundary values can be exchanged |
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125 | !-- within the PE memory |
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126 | IF ( bc_ns == 'cyclic' ) THEN |
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127 | ar(:,nys-nbgp_local:nys-1,:) = ar(:,nyn-nbgp_local+1:nyn,:) |
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128 | ar(:,nyn+1:nyn+nbgp_local,:) = ar(:,nys:nys+nbgp_local-1,:) |
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129 | ENDIF |
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130 | |
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131 | ELSE |
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132 | |
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133 | IF ( synchronous_exchange ) THEN |
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134 | ! |
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135 | !-- Send front boundary, receive rear one (synchronous) |
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136 | CALL MPI_SENDRECV( & |
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137 | ar(nzb,nys,nxl-nbgp_local), 1, type_xz(i), psouth, 0, & |
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138 | ar(nzb,nyn+1,nxl-nbgp_local), 1, type_xz(i), pnorth, 0, & |
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139 | comm2d, status, ierr ) |
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140 | ! |
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141 | !-- Send rear boundary, receive front one (synchronous) |
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142 | CALL MPI_SENDRECV( & |
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143 | ar(nzb,nyn-nbgp_local+1,nxl-nbgp_local), 1, type_xz(i), pnorth, 1, & |
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144 | ar(nzb,nys-nbgp_local,nxl-nbgp_local), 1, type_xz(i), psouth, 1, & |
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145 | comm2d, status, ierr ) |
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146 | |
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147 | ELSE |
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148 | |
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149 | req = 0 |
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150 | ! |
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151 | !-- Send front boundary, receive rear one (asynchronous) |
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152 | CALL MPI_ISEND( ar(nzb,nys,nxl-nbgp_local), 1, type_xz(i), psouth, & |
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153 | 0, comm2d, req(1), ierr ) |
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154 | CALL MPI_IRECV( ar(nzb,nyn+1,nxl-nbgp_local), 1, type_xz(i), pnorth, & |
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155 | 0, comm2d, req(2), ierr ) |
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156 | ! |
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157 | !-- Send rear boundary, receive front one (asynchronous) |
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158 | CALL MPI_ISEND( ar(nzb,nyn-nbgp_local+1,nxl-nbgp_local), 1, & |
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159 | type_xz(i), pnorth, 1, comm2d, req(3), ierr ) |
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160 | CALL MPI_IRECV( ar(nzb,nys-nbgp_local,nxl-nbgp_local), 1, & |
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161 | type_xz(i), psouth, 1, comm2d, req(4), ierr ) |
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162 | |
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163 | CALL MPI_WAITALL( 4, req, wait_stat, ierr ) |
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164 | |
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165 | ENDIF |
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166 | |
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167 | ENDIF |
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168 | |
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169 | #else |
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170 | |
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171 | ! |
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172 | !-- Lateral boundary conditions in the non-parallel case |
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173 | IF ( bc_lr == 'cyclic' ) THEN |
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174 | ar(:,:,nxl-nbgp_local:nxl-1) = ar(:,:,nxr-nbgp_local+1:nxr) |
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175 | ar(:,:,nxr+1:nxr+nbgp_local) = ar(:,:,nxl:nxl+nbgp_local-1) |
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176 | ENDIF |
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177 | |
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178 | IF ( bc_ns == 'cyclic' ) THEN |
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179 | ar(:,nys-nbgp_local:nys-1,:) = ar(:,nyn-nbgp_local+1:nyn,:) |
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180 | ar(:,nyn+1:nyn+nbgp_local,:) = ar(:,nys:nys+nbgp_local-1,:) |
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181 | ENDIF |
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182 | |
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183 | #endif |
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184 | CALL cpu_log( log_point_s(2), 'exchange_horiz', 'stop' ) |
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185 | |
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186 | |
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187 | END SUBROUTINE exchange_horiz |
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