105 строки
3.5 KiB
C
105 строки
3.5 KiB
C
/*
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* Copyright (c) 2004-2005 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) 2004-2017 The University of Tennessee and The University
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* of Tennessee Research Foundation. All rights
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* 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 (c) 2006-2010 University of Houston. All rights reserved.
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* Copyright (c) 2015-2017 Research Organization for Information Science
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* and Technology (RIST). 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_inter.h"
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#include <stdlib.h>
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#include "mpi.h"
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#include "ompi/constants.h"
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#include "ompi/datatype/ompi_datatype.h"
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#include "ompi/communicator/communicator.h"
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#include "ompi/mca/coll/coll.h"
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#include "ompi/mca/pml/pml.h"
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#include "ompi/mca/coll/base/coll_tags.h"
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#include "ompi/mca/coll/base/coll_base_util.h"
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/*
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* allgather_inter
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*
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* Function: - allgather using other MPI collections
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* Accepts: - same as MPI_Allgather()
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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_inter_allgather_inter(const void *sbuf, int scount,
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struct ompi_datatype_t *sdtype,
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void *rbuf, int rcount,
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struct ompi_datatype_t *rdtype,
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struct ompi_communicator_t *comm,
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mca_coll_base_module_t *module)
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{
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int rank, root = 0, size, rsize, err = OMPI_SUCCESS;
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char *ptmp_free = NULL, *ptmp = NULL;
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ptrdiff_t gap, span;
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rank = ompi_comm_rank(comm);
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size = ompi_comm_size(comm->c_local_comm);
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rsize = ompi_comm_remote_size(comm);
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/* Perform the gather locally at the root */
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if ( scount > 0 ) {
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span = opal_datatype_span(&sdtype->super, (int64_t)scount*(int64_t)size, &gap);
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ptmp_free = (char*)malloc(span);
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if (NULL == ptmp_free) {
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return OMPI_ERR_OUT_OF_RESOURCE;
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}
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ptmp = ptmp_free - gap;
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err = comm->c_local_comm->c_coll->coll_gather(sbuf, scount, sdtype,
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ptmp, scount, sdtype,
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0, comm->c_local_comm,
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comm->c_local_comm->c_coll->coll_gather_module);
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if (OMPI_SUCCESS != err) {
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goto exit;
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}
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}
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if (rank == root) {
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/* Do a send-recv between the two root procs. to avoid deadlock */
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err = ompi_coll_base_sendrecv_actual(ptmp, scount*size, sdtype, 0,
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MCA_COLL_BASE_TAG_ALLGATHER,
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rbuf, rcount*rsize, rdtype, 0,
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MCA_COLL_BASE_TAG_ALLGATHER,
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comm, MPI_STATUS_IGNORE);
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if (OMPI_SUCCESS != err) {
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goto exit;
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}
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}
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/* bcast the message to all the local processes */
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if ( rcount > 0 ) {
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err = comm->c_local_comm->c_coll->coll_bcast(rbuf, rcount*rsize, rdtype,
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root, comm->c_local_comm,
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comm->c_local_comm->c_coll->coll_bcast_module);
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if (OMPI_SUCCESS != err) {
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goto exit;
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}
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}
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exit:
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if (NULL != ptmp_free) {
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free(ptmp_free);
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}
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return err;
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}
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