366d64b7e5
As we changed the ABI (forcing a major release), we can limit the size of the predefined communicators by moving the collective structure outside the communicator. This might have a minimal, but unnoticeable, impact on performance. This approach has been discussed during the January 2017 devel meeting. Signed-off-by: George Bosilca <bosilca@icl.utk.edu> Signed-off-by: Joshua Hursey <jhursey@us.ibm.com>
81 строка
2.5 KiB
C
81 строка
2.5 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) 2006-2007 University of Houston. All rights reserved.
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* Copyright (c) 2013 Cisco Systems, Inc. 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 "mpi.h"
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#include "ompi/constants.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/coll/base/coll_tags.h"
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#include "ompi/mca/pml/pml.h"
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/*
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* bcast_inter
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*
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* Function: - broadcast using the local_comm
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* Accepts: - same arguments as MPI_Bcast()
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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_bcast_inter(void *buff, int count,
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struct ompi_datatype_t *datatype, int root,
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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;
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int err;
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rank = ompi_comm_rank(comm);
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if (MPI_PROC_NULL == root) {
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/* do nothing */
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err = OMPI_SUCCESS;
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} else if (MPI_ROOT != root) {
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/* Non-root, first process recieves the data and bcast to others */
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if ( 0 == rank ) {
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err = MCA_PML_CALL(recv(buff, count, datatype, root,
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MCA_COLL_BASE_TAG_BCAST, comm,
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MPI_STATUS_IGNORE));
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if (OMPI_SUCCESS != err) {
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return err;
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}
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}
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err = comm->c_local_comm->c_coll->coll_bcast(buff, count, datatype, 0,
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comm->c_local_comm,
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comm->c_local_comm->c_coll->coll_bcast_module);
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} else {
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/* root section, send to the first process of the remote group */
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err = MCA_PML_CALL(send(buff, count, datatype, 0,
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MCA_COLL_BASE_TAG_BCAST,
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MCA_PML_BASE_SEND_STANDARD,
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comm));
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if (OMPI_SUCCESS != err) {
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return err;
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}
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}
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/* All done */
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return err;
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}
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