1 | !BOP ------------------------------------------------------------------- |
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2 | ! |
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3 | ! !MODULE: m_FcComms - MPI collective communication operators |
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4 | ! with explict flow control |
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5 | ! |
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6 | ! !DESCRIPTION: |
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7 | ! |
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8 | ! This module includes implementations of MPI collective operators that |
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9 | ! have proven problematic on certain systems when run at scale. By |
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10 | ! introducing additonal flow control, these problems (exhausting internal |
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11 | ! system resources) can be avoided. These routines were ported from |
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12 | ! the Community Atmosphere Model's spmd_utils.F90. |
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13 | ! |
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14 | ! !INTERFACE: |
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15 | ! |
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16 | ! Disable the use of the MPI ready send protocol by default, to |
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17 | ! address recurrent issues with poor performance or incorrect |
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18 | ! functionality in MPI libraries. When support is known to be robust, |
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19 | ! or for experimentation, can be re-enabled by defining the CPP token |
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20 | ! _USE_MPI_RSEND during the build process. |
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21 | ! |
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22 | #ifndef _USE_MPI_RSEND |
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23 | #define MPI_RSEND MPI_SEND |
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24 | #define mpi_rsend mpi_send |
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25 | #define MPI_IRSEND MPI_ISEND |
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26 | #define mpi_irsend mpi_isend |
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27 | #endif |
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28 | |
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29 | module m_FcComms |
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30 | |
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31 | implicit none |
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32 | |
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33 | private ! except |
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34 | |
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35 | public :: fc_gather_int ! flow control version of mpi_gather for integer vectors |
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36 | public :: fc_gather_fp ! flow control version of mpi_gather for FP vectors |
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37 | public :: fc_gatherv_int ! flow control version of mpi_gatherv for integer vectors |
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38 | public :: fc_gatherv_fp ! flow control version of mpi_gatherv for integer vectors |
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39 | public :: get_fcblocksize ! get current value of max_gather_block_size |
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40 | public :: set_fcblocksize ! set current value of max_gather_block_size |
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41 | |
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42 | |
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43 | ! !REVISION HISTORY: |
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44 | ! 30Jan09 - P.H. Worley <worleyph@ornl.gov> - imported routines |
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45 | ! from CAM's spmd_utils to create this module. |
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46 | |
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47 | integer, public :: max_gather_block_size = 64 |
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48 | character(len=*),parameter :: myname='MCT(MPEU)::m_FcComms' |
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49 | |
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50 | contains |
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51 | |
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52 | !BOP ------------------------------------------------------------------- |
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53 | ! |
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54 | ! !IROUTINE: fc_gather_int - Gather an array of type integer |
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55 | ! |
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56 | ! !DESCRIPTION: |
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57 | ! This routine gathers a {\em distributed} array of type {\em integer} |
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58 | ! to the {\tt root} process. Explicit handshaking messages are used |
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59 | ! to control the number of processes communicating with the root |
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60 | ! at any one time. |
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61 | ! |
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62 | ! If flow_cntl optional parameter |
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63 | ! < 0 : use MPI_Gather |
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64 | ! >= 0: use point-to-point with handshaking messages and |
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65 | ! preposting receive requests up to |
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66 | ! min(max(1,flow_cntl),max_gather_block_size) |
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67 | ! ahead if optional flow_cntl parameter is present. |
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68 | ! Otherwise, max_gather_block_size is used in its place. |
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69 | ! Default value is max_gather_block_size. |
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70 | ! !INTERFACE: |
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71 | ! |
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72 | subroutine fc_gather_int (sendbuf, sendcnt, sendtype, & |
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73 | recvbuf, recvcnt, recvtype, & |
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74 | root, comm, flow_cntl ) |
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75 | ! |
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76 | ! !USES: |
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77 | ! |
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78 | use m_die |
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79 | use m_mpif90 |
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80 | ! |
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81 | ! !INPUT PARAMETERS: |
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82 | ! |
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83 | integer, intent(in) :: sendbuf(*) |
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84 | integer, intent(in) :: sendcnt |
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85 | integer, intent(in) :: sendtype |
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86 | integer, intent(in) :: recvcnt |
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87 | integer, intent(in) :: recvtype |
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88 | integer, intent(in) :: root |
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89 | integer, intent(in) :: comm |
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90 | integer, optional, intent(in) :: flow_cntl |
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91 | |
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92 | ! !OUTPUT PARAMETERS: |
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93 | ! |
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94 | integer, intent(out) :: recvbuf(*) |
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95 | |
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96 | ! !REVISION HISTORY: |
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97 | ! 30Jan09 - P.H. Worley - imported from spmd_utils.F90 |
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98 | !EOP ___________________________________________________________________ |
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99 | |
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100 | character(len=*),parameter :: myname_=myname//'::fc_gather_int' |
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101 | |
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102 | integer :: signal |
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103 | logical fc_gather ! use explicit flow control? |
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104 | integer gather_block_size ! number of preposted receive requests |
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105 | |
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106 | integer :: mytid, mysize, mtag, p, i, count, displs |
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107 | integer :: preposts, head, tail |
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108 | integer :: rcvid(max_gather_block_size) |
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109 | integer :: status(MP_STATUS_SIZE) |
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110 | integer :: ier ! MPI error code |
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111 | |
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112 | signal = 1 |
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113 | if ( present(flow_cntl) ) then |
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114 | if (flow_cntl >= 0) then |
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115 | gather_block_size = min(max(1,flow_cntl),max_gather_block_size) |
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116 | fc_gather = .true. |
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117 | else |
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118 | fc_gather = .false. |
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119 | endif |
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120 | else |
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121 | gather_block_size = max(1,max_gather_block_size) |
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122 | fc_gather = .true. |
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123 | endif |
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124 | |
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125 | if (fc_gather) then |
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126 | |
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127 | call mpi_comm_rank (comm, mytid, ier) |
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128 | call mpi_comm_size (comm, mysize, ier) |
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129 | mtag = 0 |
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130 | if (root .eq. mytid) then |
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131 | |
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132 | ! prepost gather_block_size irecvs, and start receiving data |
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133 | preposts = min(mysize-1, gather_block_size) |
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134 | head = 0 |
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135 | count = 0 |
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136 | do p=0, mysize-1 |
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137 | if (p .ne. root) then |
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138 | if (recvcnt > 0) then |
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139 | count = count + 1 |
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140 | if (count > preposts) then |
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141 | tail = mod(head,preposts) + 1 |
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142 | call mpi_wait (rcvid(tail), status, ier) |
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143 | end if |
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144 | head = mod(head,preposts) + 1 |
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145 | displs = p*recvcnt |
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146 | call mpi_irecv ( recvbuf(displs+1), recvcnt, & |
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147 | recvtype, p, mtag, comm, rcvid(head), & |
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148 | ier ) |
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149 | call mpi_send ( signal, 1, recvtype, p, mtag, comm, ier ) |
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150 | end if |
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151 | end if |
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152 | end do |
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153 | |
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154 | ! copy local data |
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155 | displs = mytid*recvcnt |
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156 | do i=1,sendcnt |
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157 | recvbuf(displs+i) = sendbuf(i) |
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158 | enddo |
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159 | |
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160 | ! wait for final data |
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161 | do i=1,min(count,preposts) |
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162 | call mpi_wait (rcvid(i), status, ier) |
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163 | enddo |
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164 | |
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165 | else |
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166 | |
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167 | if (sendcnt > 0) then |
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168 | call mpi_recv ( signal, 1, sendtype, root, mtag, comm, & |
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169 | status, ier ) |
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170 | call mpi_rsend ( sendbuf, sendcnt, sendtype, root, mtag, & |
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171 | comm, ier ) |
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172 | end if |
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173 | |
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174 | endif |
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175 | if (ier /= 0) then |
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176 | call MP_perr_die(myname_,':: (point-to-point implementation)',ier) |
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177 | end if |
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178 | |
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179 | else |
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180 | |
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181 | call mpi_gather (sendbuf, sendcnt, sendtype, & |
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182 | recvbuf, recvcnt, recvtype, & |
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183 | root, comm, ier) |
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184 | if (ier /= 0) then |
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185 | call MP_perr_die(myname_,':: MPI_GATHER',ier) |
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186 | end if |
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187 | |
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188 | endif |
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189 | |
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190 | return |
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191 | end subroutine fc_gather_int |
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192 | |
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193 | !BOP ------------------------------------------------------------------- |
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194 | ! |
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195 | ! !IROUTINE: fc_gather_fp - Gather an array of type FP |
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196 | ! |
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197 | ! !DESCRIPTION: |
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198 | ! This routine gathers a {\em distributed} array of type {\em FP} to |
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199 | ! the {\tt root} process. Explicit handshaking messages are used |
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200 | ! to control the number of processes communicating with the root |
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201 | ! at any one time. |
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202 | ! |
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203 | ! If flow_cntl optional parameter |
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204 | ! < 0 : use MPI_Gather |
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205 | ! >= 0: use point-to-point with handshaking messages and |
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206 | ! preposting receive requests up to |
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207 | ! min(max(1,flow_cntl),max_gather_block_size) |
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208 | ! ahead if optional flow_cntl parameter is present. |
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209 | ! Otherwise, max_gather_block_size is used in its place. |
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210 | ! Default value is max_gather_block_size. |
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211 | ! !INTERFACE: |
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212 | ! |
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213 | subroutine fc_gather_fp (sendbuf, sendcnt, sendtype, & |
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214 | recvbuf, recvcnt, recvtype, & |
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215 | root, comm, flow_cntl ) |
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216 | ! |
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217 | ! !USES: |
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218 | ! |
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219 | use m_realkinds, only : FP |
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220 | use m_die |
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221 | use m_mpif90 |
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222 | ! |
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223 | ! !INPUT PARAMETERS: |
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224 | ! |
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225 | real (FP), intent(in) :: sendbuf(*) |
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226 | integer, intent(in) :: sendcnt |
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227 | integer, intent(in) :: sendtype |
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228 | integer, intent(in) :: recvcnt |
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229 | integer, intent(in) :: recvtype |
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230 | integer, intent(in) :: root |
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231 | integer, intent(in) :: comm |
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232 | integer, optional, intent(in) :: flow_cntl |
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233 | |
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234 | ! !OUTPUT PARAMETERS: |
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235 | ! |
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236 | real (FP), intent(out) :: recvbuf(*) |
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237 | |
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238 | ! !REVISION HISTORY: |
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239 | ! 30Jan09 - P.H. Worley - imported from spmd_utils.F90 |
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240 | !EOP ___________________________________________________________________ |
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241 | |
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242 | character(len=*),parameter :: myname_=myname//'::fc_gather_fp' |
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243 | |
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244 | real (FP) :: signal |
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245 | logical fc_gather ! use explicit flow control? |
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246 | integer gather_block_size ! number of preposted receive requests |
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247 | |
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248 | integer :: mytid, mysize, mtag, p, i, count, displs |
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249 | integer :: preposts, head, tail |
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250 | integer :: rcvid(max_gather_block_size) |
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251 | integer :: status(MP_STATUS_SIZE) |
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252 | integer :: ier ! MPI error code |
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253 | |
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254 | signal = 1.0 |
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255 | if ( present(flow_cntl) ) then |
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256 | if (flow_cntl >= 0) then |
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257 | gather_block_size = min(max(1,flow_cntl),max_gather_block_size) |
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258 | fc_gather = .true. |
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259 | else |
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260 | fc_gather = .false. |
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261 | endif |
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262 | else |
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263 | gather_block_size = max(1,max_gather_block_size) |
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264 | fc_gather = .true. |
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265 | endif |
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266 | |
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267 | if (fc_gather) then |
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268 | |
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269 | call mpi_comm_rank (comm, mytid, ier) |
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270 | call mpi_comm_size (comm, mysize, ier) |
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271 | mtag = 0 |
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272 | if (root .eq. mytid) then |
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273 | |
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274 | ! prepost gather_block_size irecvs, and start receiving data |
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275 | preposts = min(mysize-1, gather_block_size) |
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276 | head = 0 |
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277 | count = 0 |
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278 | do p=0, mysize-1 |
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279 | if (p .ne. root) then |
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280 | if (recvcnt > 0) then |
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281 | count = count + 1 |
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282 | if (count > preposts) then |
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283 | tail = mod(head,preposts) + 1 |
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284 | call mpi_wait (rcvid(tail), status, ier) |
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285 | end if |
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286 | head = mod(head,preposts) + 1 |
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287 | displs = p*recvcnt |
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288 | call mpi_irecv ( recvbuf(displs+1), recvcnt, & |
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289 | recvtype, p, mtag, comm, rcvid(head), & |
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290 | ier ) |
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291 | call mpi_send ( signal, 1, recvtype, p, mtag, comm, ier ) |
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292 | end if |
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293 | end if |
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294 | end do |
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295 | |
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296 | ! copy local data |
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297 | displs = mytid*recvcnt |
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298 | do i=1,sendcnt |
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299 | recvbuf(displs+i) = sendbuf(i) |
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300 | enddo |
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301 | |
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302 | ! wait for final data |
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303 | do i=1,min(count,preposts) |
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304 | call mpi_wait (rcvid(i), status, ier) |
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305 | enddo |
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306 | |
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307 | else |
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308 | |
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309 | if (sendcnt > 0) then |
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310 | call mpi_recv ( signal, 1, sendtype, root, mtag, comm, & |
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311 | status, ier ) |
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312 | call mpi_rsend ( sendbuf, sendcnt, sendtype, root, mtag, & |
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313 | comm, ier ) |
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314 | end if |
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315 | |
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316 | endif |
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317 | if (ier /= 0) then |
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318 | call MP_perr_die(myname_,':: (point-to-point implementation)',ier) |
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319 | end if |
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320 | |
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321 | else |
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322 | |
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323 | call mpi_gather (sendbuf, sendcnt, sendtype, & |
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324 | recvbuf, recvcnt, recvtype, & |
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325 | root, comm, ier) |
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326 | if (ier /= 0) then |
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327 | call MP_perr_die(myname_,':: MPI_GATHER',ier) |
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328 | end if |
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329 | |
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330 | endif |
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331 | |
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332 | return |
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333 | end subroutine fc_gather_fp |
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334 | |
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335 | !BOP ------------------------------------------------------------------- |
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336 | ! |
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337 | ! !IROUTINE: fc_gatherv_int - Gather an array of type integer |
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338 | ! |
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339 | ! !DESCRIPTION: |
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340 | ! This routine gathers a {\em distributed} array of type {\em integer} |
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341 | ! to the {\tt root} process. Explicit handshaking messages are used |
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342 | ! to control the number of processes communicating with the root |
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343 | ! at any one time. |
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344 | ! |
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345 | ! If flow_cntl optional parameter |
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346 | ! < 0 : use MPI_Gatherv |
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347 | ! >= 0: use point-to-point with handshaking messages and |
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348 | ! preposting receive requests up to |
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349 | ! min(max(1,flow_cntl),max_gather_block_size) |
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350 | ! ahead if optional flow_cntl parameter is present. |
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351 | ! Otherwise, max_gather_block_size is used in its place. |
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352 | ! Default value is max_gather_block_size. |
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353 | ! !INTERFACE: |
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354 | ! |
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355 | subroutine fc_gatherv_int (sendbuf, sendcnt, sendtype, & |
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356 | recvbuf, recvcnts, displs, recvtype, & |
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357 | root, comm, flow_cntl ) |
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358 | ! |
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359 | ! !USES: |
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360 | ! |
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361 | use m_die |
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362 | use m_mpif90 |
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363 | ! |
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364 | ! !INPUT PARAMETERS: |
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365 | ! |
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366 | integer, intent(in) :: sendbuf(*) |
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367 | integer, intent(in) :: sendcnt |
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368 | integer, intent(in) :: sendtype |
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369 | integer, intent(in) :: recvcnts(*) |
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370 | integer, intent(in) :: displs(*) |
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371 | integer, intent(in) :: recvtype |
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372 | integer, intent(in) :: root |
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373 | integer, intent(in) :: comm |
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374 | integer, optional, intent(in) :: flow_cntl |
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375 | |
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376 | ! !OUTPUT PARAMETERS: |
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377 | ! |
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378 | integer, intent(out) :: recvbuf(*) |
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379 | |
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380 | ! !REVISION HISTORY: |
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381 | ! 30Jan09 - P.H. Worley - imported from spmd_utils.F90 |
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382 | !EOP ___________________________________________________________________ |
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383 | |
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384 | character(len=*),parameter :: myname_=myname//'::fc_gatherv_int' |
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385 | |
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386 | integer :: signal |
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387 | logical fc_gather ! use explicit flow control? |
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388 | integer gather_block_size ! number of preposted receive requests |
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389 | |
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390 | integer :: mytid, mysize, mtag, p, q, i, count |
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391 | integer :: preposts, head, tail |
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392 | integer :: rcvid(max_gather_block_size) |
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393 | integer :: status(MP_STATUS_SIZE) |
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394 | integer :: ier ! MPI error code |
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395 | |
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396 | signal = 1 |
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397 | if ( present(flow_cntl) ) then |
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398 | if (flow_cntl >= 0) then |
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399 | gather_block_size = min(max(1,flow_cntl),max_gather_block_size) |
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400 | fc_gather = .true. |
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401 | else |
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402 | fc_gather = .false. |
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403 | endif |
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404 | else |
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405 | gather_block_size = max(1,max_gather_block_size) |
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406 | fc_gather = .true. |
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407 | endif |
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408 | |
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409 | if (fc_gather) then |
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410 | |
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411 | call mpi_comm_rank (comm, mytid, ier) |
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412 | call mpi_comm_size (comm, mysize, ier) |
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413 | mtag = 0 |
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414 | if (root .eq. mytid) then |
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415 | |
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416 | ! prepost gather_block_size irecvs, and start receiving data |
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417 | preposts = min(mysize-1, gather_block_size) |
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418 | head = 0 |
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419 | count = 0 |
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420 | do p=0, mysize-1 |
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421 | if (p .ne. root) then |
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422 | q = p+1 |
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423 | if (recvcnts(q) > 0) then |
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424 | count = count + 1 |
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425 | if (count > preposts) then |
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426 | tail = mod(head,preposts) + 1 |
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427 | call mpi_wait (rcvid(tail), status, ier) |
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428 | end if |
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429 | head = mod(head,preposts) + 1 |
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430 | call mpi_irecv ( recvbuf(displs(q)+1), recvcnts(q), & |
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431 | recvtype, p, mtag, comm, rcvid(head), & |
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432 | ier ) |
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433 | call mpi_send ( signal, 1, recvtype, p, mtag, comm, ier ) |
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434 | end if |
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435 | end if |
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436 | end do |
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437 | |
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438 | ! copy local data |
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439 | q = mytid+1 |
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440 | do i=1,sendcnt |
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441 | recvbuf(displs(q)+i) = sendbuf(i) |
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442 | enddo |
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443 | |
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444 | ! wait for final data |
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445 | do i=1,min(count,preposts) |
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446 | call mpi_wait (rcvid(i), status, ier) |
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447 | enddo |
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448 | |
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449 | else |
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450 | |
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451 | if (sendcnt > 0) then |
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452 | call mpi_recv ( signal, 1, sendtype, root, mtag, comm, & |
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453 | status, ier ) |
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454 | call mpi_rsend ( sendbuf, sendcnt, sendtype, root, mtag, & |
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455 | comm, ier ) |
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456 | end if |
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457 | |
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458 | endif |
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459 | if (ier /= 0) then |
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460 | call MP_perr_die(myname_,':: (point-to-point implementation)',ier) |
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461 | end if |
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462 | |
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463 | else |
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464 | |
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465 | call mpi_gatherv (sendbuf, sendcnt, sendtype, & |
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466 | recvbuf, recvcnts, displs, recvtype, & |
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467 | root, comm, ier) |
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468 | if (ier /= 0) then |
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469 | call MP_perr_die(myname_,':: MPI_GATHERV',ier) |
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470 | end if |
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471 | |
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472 | endif |
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473 | |
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474 | return |
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475 | end subroutine fc_gatherv_int |
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476 | |
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477 | !BOP ------------------------------------------------------------------- |
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478 | ! |
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479 | ! !IROUTINE: fc_gatherv_fp - Gather an array of type FP |
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480 | ! |
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481 | ! !DESCRIPTION: |
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482 | ! This routine gathers a {\em distributed} array of type {\em FP} to |
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483 | ! the {\tt root} process. Explicit handshaking messages are used |
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484 | ! to control the number of processes communicating with the root |
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485 | ! at any one time. |
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486 | ! |
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487 | ! If flow_cntl optional parameter |
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488 | ! < 0 : use MPI_Gatherv |
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489 | ! >= 0: use point-to-point with handshaking messages and |
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490 | ! preposting receive requests up to |
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491 | ! min(max(1,flow_cntl),max_gather_block_size) |
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492 | ! ahead if optional flow_cntl parameter is present. |
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493 | ! Otherwise, max_gather_block_size is used in its place. |
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494 | ! Default value is max_gather_block_size. |
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495 | ! !INTERFACE: |
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496 | ! |
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497 | subroutine fc_gatherv_fp (sendbuf, sendcnt, sendtype, & |
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498 | recvbuf, recvcnts, displs, recvtype, & |
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499 | root, comm, flow_cntl ) |
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500 | ! |
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501 | ! !USES: |
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502 | ! |
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503 | use m_realkinds, only : FP |
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504 | use m_die |
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505 | use m_mpif90 |
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506 | ! |
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507 | ! !INPUT PARAMETERS: |
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508 | ! |
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509 | real (FP), intent(in) :: sendbuf(*) |
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510 | integer, intent(in) :: sendcnt |
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511 | integer, intent(in) :: sendtype |
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512 | integer, intent(in) :: recvcnts(*) |
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513 | integer, intent(in) :: displs(*) |
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514 | integer, intent(in) :: recvtype |
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515 | integer, intent(in) :: root |
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516 | integer, intent(in) :: comm |
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517 | integer, optional, intent(in) :: flow_cntl |
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518 | |
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519 | ! !OUTPUT PARAMETERS: |
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520 | ! |
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521 | real (FP), intent(out) :: recvbuf(*) |
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522 | |
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523 | ! !REVISION HISTORY: |
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524 | ! 30Jan09 - P.H. Worley - imported from spmd_utils.F90 |
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525 | !EOP ___________________________________________________________________ |
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526 | |
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527 | character(len=*),parameter :: myname_=myname//'::fc_gatherv_fp' |
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528 | |
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529 | real (FP) :: signal |
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530 | logical fc_gather ! use explicit flow control? |
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531 | integer gather_block_size ! number of preposted receive requests |
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532 | |
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533 | integer :: mytid, mysize, mtag, p, q, i, count |
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534 | integer :: preposts, head, tail |
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535 | integer :: rcvid(max_gather_block_size) |
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536 | integer :: status(MP_STATUS_SIZE) |
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537 | integer :: ier ! MPI error code |
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538 | |
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539 | signal = 1.0 |
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540 | if ( present(flow_cntl) ) then |
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541 | if (flow_cntl >= 0) then |
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542 | gather_block_size = min(max(1,flow_cntl),max_gather_block_size) |
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543 | fc_gather = .true. |
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544 | else |
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545 | fc_gather = .false. |
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546 | endif |
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547 | else |
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548 | gather_block_size = max(1,max_gather_block_size) |
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549 | fc_gather = .true. |
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550 | endif |
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551 | |
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552 | if (fc_gather) then |
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553 | |
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554 | call mpi_comm_rank (comm, mytid, ier) |
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555 | call mpi_comm_size (comm, mysize, ier) |
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556 | mtag = 0 |
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557 | if (root .eq. mytid) then |
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558 | |
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559 | ! prepost gather_block_size irecvs, and start receiving data |
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560 | preposts = min(mysize-1, gather_block_size) |
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561 | head = 0 |
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562 | count = 0 |
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563 | do p=0, mysize-1 |
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564 | if (p .ne. root) then |
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565 | q = p+1 |
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566 | if (recvcnts(q) > 0) then |
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567 | count = count + 1 |
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568 | if (count > preposts) then |
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569 | tail = mod(head,preposts) + 1 |
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570 | call mpi_wait (rcvid(tail), status, ier) |
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571 | end if |
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572 | head = mod(head,preposts) + 1 |
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573 | call mpi_irecv ( recvbuf(displs(q)+1), recvcnts(q), & |
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574 | recvtype, p, mtag, comm, rcvid(head), & |
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575 | ier ) |
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576 | call mpi_send ( signal, 1, recvtype, p, mtag, comm, ier ) |
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577 | end if |
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578 | end if |
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579 | end do |
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580 | |
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581 | ! copy local data |
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582 | q = mytid+1 |
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583 | do i=1,sendcnt |
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584 | recvbuf(displs(q)+i) = sendbuf(i) |
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585 | enddo |
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586 | |
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587 | ! wait for final data |
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588 | do i=1,min(count,preposts) |
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589 | call mpi_wait (rcvid(i), status, ier) |
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590 | enddo |
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591 | |
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592 | else |
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593 | |
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594 | if (sendcnt > 0) then |
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595 | call mpi_recv ( signal, 1, sendtype, root, mtag, comm, & |
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596 | status, ier ) |
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597 | call mpi_rsend ( sendbuf, sendcnt, sendtype, root, mtag, & |
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598 | comm, ier ) |
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599 | end if |
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600 | |
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601 | endif |
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602 | if (ier /= 0) then |
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603 | call MP_perr_die(myname_,':: (point-to-point implementation)',ier) |
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604 | end if |
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605 | |
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606 | else |
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607 | |
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608 | call mpi_gatherv (sendbuf, sendcnt, sendtype, & |
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609 | recvbuf, recvcnts, displs, recvtype, & |
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610 | root, comm, ier) |
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611 | if (ier /= 0) then |
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612 | call MP_perr_die(myname_,':: MPI_GATHERV',ier) |
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613 | end if |
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614 | |
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615 | endif |
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616 | |
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617 | return |
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618 | end subroutine fc_gatherv_fp |
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619 | |
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620 | !BOP ------------------------------------------------------------------- |
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621 | ! |
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622 | ! !IROUTINE: get_fcblocksize - return max_gather_block_size |
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623 | ! |
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624 | ! !DESCRIPTION: |
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625 | ! This function returns the current value of max_gather_block_size |
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626 | ! |
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627 | ! !INTERFACE: |
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628 | |
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629 | function get_fcblocksize() |
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630 | |
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631 | ! !USES: |
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632 | ! |
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633 | ! No external modules are used by this function. |
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634 | |
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635 | implicit none |
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636 | |
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637 | ! !INPUT PARAMETERS: |
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638 | ! |
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639 | |
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640 | ! !OUTPUT PARAMETERS: |
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641 | ! |
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642 | integer :: get_fcblocksize |
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643 | |
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644 | ! !REVISION HISTORY: |
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645 | ! 03Mar09 - R. Jacob (jacob@mcs.anl.gov) -- intial version |
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646 | !EOP ___________________________________________________________________ |
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647 | |
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648 | character(len=*),parameter :: myname_=myname//'::get_fcblocksize' |
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649 | |
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650 | get_fcblocksize = max_gather_block_size |
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651 | |
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652 | end function get_fcblocksize |
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653 | |
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654 | !BOP ------------------------------------------------------------------- |
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655 | ! |
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656 | ! !IROUTINE: set_fcblocksize - set max_gather_block_size |
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657 | ! |
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658 | ! !DESCRIPTION: |
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659 | ! This function sets the current value of max_gather_block_size |
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660 | ! |
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661 | ! !INTERFACE: |
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662 | |
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663 | subroutine set_fcblocksize(gather_block_size) |
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664 | |
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665 | ! !USES: |
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666 | ! |
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667 | ! No external modules are used by this function. |
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668 | |
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669 | implicit none |
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670 | |
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671 | ! !INPUT PARAMETERS: |
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672 | ! |
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673 | integer :: gather_block_size |
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674 | |
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675 | ! !OUTPUT PARAMETERS: |
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676 | ! |
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677 | |
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678 | ! !REVISION HISTORY: |
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679 | ! 03Mar09 - R. Jacob (jacob@mcs.anl.gov) -- intial version |
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680 | !EOP ___________________________________________________________________ |
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681 | |
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682 | character(len=*),parameter :: myname_=myname//':: set_fcblocksize' |
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683 | |
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684 | max_gather_block_size = gather_block_size |
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685 | |
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686 | end subroutine set_fcblocksize |
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687 | |
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688 | end module m_FcComms |
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