85 строки
2.6 KiB
C
85 строки
2.6 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) 2004-2005 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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* $COPYRIGHT$
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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_hierarch.h"
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#include "mpi.h"
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#include "ompi/include/constants.h"
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#include "opal/util/output.h"
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#include "communicator/communicator.h"
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#include "mca/coll/coll.h"
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/*
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* bcast_intra
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*
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* Function: - broadcast using hierarchical algorithm
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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 mca_coll_hierarch_bcast_intra(void *buff,
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int count,
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struct ompi_datatype_t *datatype,
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int root,
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struct ompi_communicator_t *comm)
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{
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struct mca_coll_base_comm_t *data=NULL;
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struct ompi_communicator_t *llcomm=NULL;
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struct ompi_communicator_t *lcomm=NULL;
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int lroot, llroot;
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int rank, ret=OMPI_SUCCESS;
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rank = ompi_comm_rank ( comm );
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data = comm->c_coll_selected_data;
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lcomm = data->hier_lcomm;
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if ( mca_coll_hierarch_verbose_param ) {
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printf("%s:%d: executing hierarchical bcast with cnt=%d and root=%d\n",
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comm->c_name, rank, count, root );
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}
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/*
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* This function returns the local leader communicator
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* which *always* contains the root of this operation.
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* This might involve creating a new communicator. This is
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* also the reason, that *every* process in comm has to call
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* this function
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*/
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llcomm = mca_coll_hierarch_get_llcomm ( root, data, &llroot, &lroot);
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/* Bcast on the upper level among the local leaders */
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if ( MPI_UNDEFINED != llroot ) {
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ret = llcomm->c_coll.coll_bcast(buff, count, datatype, llroot, llcomm);
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if ( OMPI_SUCCESS != ret ) {
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return ret;
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}
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}
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/* once the local leaders got the data from the root, they can distribute
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* it to the processes in their local, low-leve communicator.
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*/
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if ( MPI_COMM_NULL != lcomm ) {
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ret = lcomm->c_coll.coll_bcast(buff, count, datatype, lroot, lcomm );
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}
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return ret;
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}
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