0fcd682c4c
all processes call MPI_Gatherv(MPI_IN_PLACE...) because IN_PLACE is only allowed to be used at the root. Non-root processes must use their receive buf as the send buf. This commit was SVN r7363.
121 строка
3.7 KiB
C
121 строка
3.7 KiB
C
/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University.
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* All rights reserved.
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* Copyright (c) 2004-2005 The Trustees of the University of Tennessee.
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* All rights reserved.
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* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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* University of Stuttgart. All rights reserved.
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* Copyright (c) 2004-2005 The Regents of the University of California.
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* All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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#include "ompi_config.h"
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#include "coll_basic.h"
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#include "mpi.h"
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#include "ompi/include/constants.h"
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#include "ompi/mca/coll/coll.h"
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#include "ompi/mca/coll/base/coll_tags.h"
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#include "coll_basic.h"
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/*
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* allgatherv_intra
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*
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* Function: - allgatherv using other MPI collectives
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* Accepts: - same as MPI_Allgatherv()
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* Returns: - MPI_SUCCESS or error code
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*/
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int
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mca_coll_basic_allgatherv_intra(void *sbuf, int scount,
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struct ompi_datatype_t *sdtype,
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void *rbuf, int *rcounts, int *disps,
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struct ompi_datatype_t *rdtype,
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struct ompi_communicator_t *comm)
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{
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int i, size, rank;
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int err;
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/* Collect all values at each process, one at a time. */
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size = ompi_comm_size(comm);
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rank = ompi_comm_rank(comm);
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for (i = 0; i < size; ++i) {
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if (MPI_IN_PLACE == sbuf) {
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/* MPI-2 7.3.3 description of MPI_Allgatherv is wrong --
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can't just have all processes call
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MPI_Gatherv(MPI_IN_PLACE...) because IN_PLACE is only
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allowed to be used at the root. Non-root processes
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must use their receive buf as the send buf. */
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if (i == rank) {
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err = comm->c_coll.coll_gatherv(MPI_IN_PLACE, -1,
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MPI_DATATYPE_NULL, rbuf,
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rcounts, disps, rdtype, i, comm);
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} else {
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err = comm->c_coll.coll_gatherv(rbuf, rcounts[i], rdtype,
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NULL, NULL, NULL, MPI_DATATYPE_NULL,
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i, comm);
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}
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} else {
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err = comm->c_coll.coll_gatherv(sbuf, scount, sdtype, rbuf,
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rcounts, disps, rdtype, i, comm);
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}
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if (MPI_SUCCESS != err) {
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return err;
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}
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}
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return MPI_SUCCESS;
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}
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/*
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* allgatherv_inter
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*
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* Function: - allgatherv using other MPI collectives
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* Accepts: - same as MPI_Allgatherv()
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* Returns: - MPI_SUCCESS or error code
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*/
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int
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mca_coll_basic_allgatherv_inter(void *sbuf, int scount,
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struct ompi_datatype_t *sdtype,
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void *rbuf, int *rcounts, int *disps,
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struct ompi_datatype_t *rdtype,
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struct ompi_communicator_t *comm)
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{
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int size, rsize;
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int err, i;
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int *scounts = NULL;
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int *sdisps = NULL;
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rsize = ompi_comm_remote_size(comm);
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size = ompi_comm_size(comm);
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scounts = (int *) malloc(rsize * sizeof(int));
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sdisps = (int *) calloc(rsize, sizeof(int));
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if (NULL == scounts || NULL == sdisps) {
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return OMPI_ERR_OUT_OF_RESOURCE;
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}
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for (i = 0; i < rsize; i++) {
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scounts[i] = scount;
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}
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err = comm->c_coll.coll_alltoallv(sbuf, scounts, sdisps, sdtype,
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rbuf, rcounts, disps, rdtype, comm);
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if (NULL != sdisps) {
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free(sdisps);
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}
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if (NULL != scounts) {
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free(scounts);
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}
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return err;
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}
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