[6331] | 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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