100 строки
3.3 KiB
C
100 строки
3.3 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) 2004-2017 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 (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 "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/op/op.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/coll/base/coll_base_util.h"
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#include "ompi/mca/pml/pml.h"
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/*
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* allreduce_inter
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*
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* Function: - allreduce using other MPI collectives
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* Accepts: - same as MPI_Allreduce()
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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_allreduce_inter(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 err, rank, root = 0;
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char *tmpbuf = NULL, *pml_buffer = NULL;
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ptrdiff_t gap, span;
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rank = ompi_comm_rank(comm);
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/* Perform the reduction locally */
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span = opal_datatype_span(&dtype->super, count, &gap);
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tmpbuf = (char *) malloc(span);
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if (NULL == tmpbuf) {
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return OMPI_ERR_OUT_OF_RESOURCE;
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}
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pml_buffer = tmpbuf - gap;
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err = comm->c_local_comm->c_coll->coll_reduce(sbuf, pml_buffer, count,
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dtype, op, root,
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comm->c_local_comm,
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comm->c_local_comm->c_coll->coll_reduce_module);
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if (OMPI_SUCCESS != err) {
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goto exit;
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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(pml_buffer, count, dtype, 0,
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MCA_COLL_BASE_TAG_ALLREDUCE,
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rbuf, count, dtype, 0,
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MCA_COLL_BASE_TAG_ALLREDUCE,
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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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err = comm->c_local_comm->c_coll->coll_bcast(rbuf, count, dtype,
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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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exit:
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if (NULL != tmpbuf) {
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free(tmpbuf);
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}
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return err;
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}
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