80 строки
2.1 KiB
C
80 строки
2.1 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_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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* barrier_intra
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*
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* Function: - barrier using hierarchical algorithm
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* Accepts: - same as MPI_Barrier()
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* Returns: - MPI_SUCCESS or error code
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*/
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int mca_coll_hierarch_barrier_intra(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 root=0;
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int lroot, llroot;
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int rank, ret;
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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 barrier\n", comm->c_name, rank );
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}
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llcomm = mca_coll_hierarch_get_llcomm ( root, data, &llroot, &lroot);
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/*
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* Barrier consists of three steps:
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* - barrier on the low-level communicators
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* - barrier among the local leaders
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* - barrier on the low-level communicators. This step is
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* necessary to avoid that any non local leaders exit too early.
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*/
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if ( MPI_COMM_NULL != lcomm ) {
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ret = lcomm->c_coll.coll_barrier ( lcomm );
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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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if ( MPI_UNDEFINED != llroot ) {
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ret = llcomm->c_coll.coll_barrier ( llcomm );
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}
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if ( MPI_COMM_NULL != lcomm ) {
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ret = lcomm->c_coll.coll_barrier ( lcomm );
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}
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return ret;
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}
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