63 строки
2.3 KiB
C
63 строки
2.3 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 (c) 2009 Cisco Systems, Inc. All rights reserved.
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* Copyright (c) 2015 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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/** @file */
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#include "ompi_config.h"
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#include "ompi/constants.h"
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#include "ompi/communicator/communicator.h"
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#include "coll_sm.h"
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/**
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* Shared memory allreduce.
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*
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* For the moment, all we're doing is a reduce to root==0 and then a
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* broadcast. It is possible that we'll do something better someday.
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*/
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int mca_coll_sm_allreduce_intra(const void *sbuf, void *rbuf, int count,
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struct ompi_datatype_t *dtype,
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struct ompi_op_t *op,
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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 ret;
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/* Note that only the root can pass MPI_IN_PLACE to MPI_REDUCE, so
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have slightly different logic for that case. */
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if (MPI_IN_PLACE == sbuf) {
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int rank = ompi_comm_rank(comm);
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if (0 == rank) {
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ret = mca_coll_sm_reduce_intra(sbuf, rbuf, count, dtype, op, 0,
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comm, module);
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} else {
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ret = mca_coll_sm_reduce_intra(rbuf, NULL, count, dtype, op, 0,
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comm, module);
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}
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} else {
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ret = mca_coll_sm_reduce_intra(sbuf, rbuf, count, dtype, op, 0,
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comm, module);
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}
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return (ret == OMPI_SUCCESS) ?
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mca_coll_sm_bcast_intra(rbuf, count, dtype, 0, comm, module) : ret;
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}
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