d85fdd2605
This commit was SVN r26684. The following SVN revision numbers were found above: r26682 --> open-mpi/ompi@15a30af11f r26683 --> open-mpi/ompi@f6ea4b7234
125 строки
5.1 KiB
C
125 строки
5.1 KiB
C
/*
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* Copyright (c) 2006 The Trustees of Indiana University and Indiana
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* University Research and Technology
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* Corporation. All rights reserved.
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* Copyright (c) 2006 The Technical University of Chemnitz. All
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* rights reserved.
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*
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* Author(s): Torsten Hoefler <htor@cs.indiana.edu>
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*
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*/
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#include "nbc_internal.h"
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/* an allgatherv schedule can not be cached easily because the contents
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* ot the recvcounts array may change, so a comparison of the address
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* would not be sufficient ... we simply do not cache it */
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#ifdef HAVE_SYS_WEAK_ALIAS_PRAGMA
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#pragma weak NBC_Iallgatherv=PNBC_Iallgatherv
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#define NBC_Iallgatherv PNBC_Iallgatherv
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#endif
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/* simple linear MPI_Iallgatherv
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* the algorithm uses p-1 rounds
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* first round:
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* each node sends to it's left node (rank+1)%p sendcount elements
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* each node begins with it's right node (rank-11)%p and receives from it recvcounts[(rank+1)%p] elements
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* second round:
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* each node sends to node (rank+2)%p sendcount elements
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* each node receives from node (rank-2)%p recvcounts[(rank+2)%p] elements */
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int NBC_Iallgatherv(void* sendbuf, int sendcount, MPI_Datatype sendtype, void* recvbuf, int *recvcounts, int *displs, MPI_Datatype recvtype, MPI_Comm comm, NBC_Handle *handle) {
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int rank, p, res, r, speer, rpeer;
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MPI_Aint rcvext, sndext;
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NBC_Schedule *schedule;
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char *rbuf, inplace;
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NBC_IN_PLACE(sendbuf, recvbuf, inplace);
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res = NBC_Init_handle(handle, comm);
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if(res != NBC_OK) { printf("Error in NBC_Init_handle(%i)\n", res); return res; }
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res = MPI_Comm_rank(comm, &rank);
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if (MPI_SUCCESS != res) { printf("MPI Error in MPI_Comm_rank() (%i)\n", res); return res; }
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res = MPI_Comm_size(comm, &p);
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if (MPI_SUCCESS != res) { printf("MPI Error in MPI_Comm_size() (%i)\n", res); return res; }
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res = MPI_Type_extent(sendtype, &sndext);
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if (MPI_SUCCESS != res) { printf("MPI Error in MPI_Type_extent() (%i)\n", res); return res; }
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res = MPI_Type_extent(recvtype, &rcvext);
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if (MPI_SUCCESS != res) { printf("MPI Error in MPI_Type_extent() (%i)\n", res); return res; }
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schedule = (NBC_Schedule*)malloc(sizeof(NBC_Schedule));
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if (NULL == schedule) { printf("Error in malloc() (%i)\n", res); return res; }
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handle->tmpbuf=NULL;
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res = NBC_Sched_create(schedule);
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if(res != NBC_OK) { printf("Error in NBC_Sched_create, (%i)\n", res); return res; }
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if(!inplace) {
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/* copy my data to receive buffer */
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rbuf = ((char *)recvbuf) + (displs[rank]*rcvext);
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NBC_Copy(sendbuf, sendcount, sendtype, rbuf, recvcounts[rank], recvtype, comm);
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if (NBC_OK != res) { printf("Error in NBC_Copy() (%i)\n", res); return res; }
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}
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/* do p-1 rounds */
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for(r=1;r<p;r++) {
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speer = (rank+r)%p;
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rpeer = (rank-r+p)%p;
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rbuf = ((char *)recvbuf) + (displs[rpeer]*rcvext);
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res = NBC_Sched_recv(rbuf, false, recvcounts[rpeer], recvtype, rpeer, schedule);
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if (NBC_OK != res) { printf("Error in NBC_Sched_recv() (%i)\n", res); return res; }
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res = NBC_Sched_send(sendbuf, false, sendcount, sendtype, speer, schedule);
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if (NBC_OK != res) { printf("Error in NBC_Sched_send() (%i)\n", res); return res; }
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}
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res = NBC_Sched_commit(schedule);
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if (NBC_OK != res) { printf("Error in NBC_Sched_commit() (%i)\n", res); return res; }
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res = NBC_Start(handle, schedule);
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if (NBC_OK != res) { printf("Error in NBC_Start() (%i)\n", res); return res; }
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return NBC_OK;
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}
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Fortran bindings */
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#ifdef HAVE_SYS_WEAK_ALIAS_PRAGMA
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NBC_F77_ALLFUNC_(nbc_iallgatherv,NBC_IALLGATHERV,(void *sendbuf, int *sendcount, int *sendtype, void *recvbuf, int *recvcounts, int *displs, int *recvtype, int *fcomm, int *fhandle, int *ierr));
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#pragma weak NBC_IALLGATHERV = nbc_iallgatherv_f
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#pragma weak nbc_iallgatherv = nbc_iallgatherv_f
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#pragma weak nbc_iallgatherv_ = nbc_iallgatherv_f
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#pragma weak nbc_iallgatherv__ = nbc_iallgatherv_f
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#pragma weak PNBC_IALLGATHERV = nbc_iallgatherv_f
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#pragma weak pnbc_iallgatherv = nbc_iallgatherv_f
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#pragma weak pnbc_iallgatherv_ = nbc_iallgatherv_f
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#pragma weak pnbc_iallgatherv__ = nbc_iallgatherv_f
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void nbc_iallgatherv_f(void *sendbuf, int *sendcount, int *sendtype, void *recvbuf, int *recvcounts, int *displs, int *recvtype, int *fcomm, int *fhandle, int *ierr) {
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#else
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void NBC_F77_FUNC_(nbc_iallgatherv,NBC_IALLGATHERV)(void *sendbuf, int *sendcount, int *sendtype, void *recvbuf, int *recvcounts, int *displs, int *recvtype, int *fcomm, int *fhandle, int *ierr);
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void NBC_F77_FUNC_(nbc_iallgatherv,NBC_IALLGATHERV)(void *sendbuf, int *sendcount, int *sendtype, void *recvbuf, int *recvcounts, int *displs, int *recvtype, int *fcomm, int *fhandle, int *ierr) {
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#endif
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MPI_Datatype rtype, stype;
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MPI_Comm comm;
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NBC_Handle *handle;
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/* this is the only MPI-2 we need :-( */
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rtype = MPI_Type_f2c(*recvtype);
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stype = MPI_Type_f2c(*sendtype);
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comm = MPI_Comm_f2c(*fcomm);
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/* create a new handle in handle table */
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NBC_Create_fortran_handle(fhandle, &handle);
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/* call NBC function */
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*ierr = NBC_Iallgatherv(sendbuf, *sendcount, stype, recvbuf, recvcounts, displs, rtype, comm, handle);
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}
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#ifdef __cplusplus
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}
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#endif
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