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>
117 строки
4.1 KiB
C
117 строки
4.1 KiB
C
/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
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/*
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* Copyright (c) 2004-2007 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) 2004-2008 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) 2013 Los Alamos National Security, LLC. All rights
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* 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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#include "ompi_config.h"
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#include <stdio.h>
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#include "ompi/mpi/c/bindings.h"
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#include "ompi/runtime/params.h"
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#include "ompi/communicator/communicator.h"
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#include "ompi/errhandler/errhandler.h"
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#include "ompi/datatype/ompi_datatype.h"
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#include "ompi/op/op.h"
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#include "ompi/memchecker.h"
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#if OMPI_BUILD_MPI_PROFILING
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#if OPAL_HAVE_WEAK_SYMBOLS
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#pragma weak MPI_Allreduce = PMPI_Allreduce
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#endif
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#define MPI_Allreduce PMPI_Allreduce
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#endif
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static const char FUNC_NAME[] = "MPI_Allreduce";
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int MPI_Allreduce(const void *sendbuf, void *recvbuf, int count,
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MPI_Datatype datatype, MPI_Op op, MPI_Comm comm)
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{
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int err;
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MEMCHECKER(
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memchecker_datatype(datatype);
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memchecker_comm(comm);
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/* check whether receive buffer is defined. */
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memchecker_call(&opal_memchecker_base_isaddressable, recvbuf, count, datatype);
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/* check whether the actual send buffer is defined. */
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if (MPI_IN_PLACE == sendbuf) {
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memchecker_call(&opal_memchecker_base_isdefined, recvbuf, count, datatype);
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} else {
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memchecker_call(&opal_memchecker_base_isdefined, sendbuf, count, datatype);
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}
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);
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if (MPI_PARAM_CHECK) {
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char *msg;
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/* Unrooted operation -- same checks for all ranks on both
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intracommunicators and intercommunicators */
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err = MPI_SUCCESS;
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OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
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if (ompi_comm_invalid(comm)) {
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return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_COMM,
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FUNC_NAME);
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} else if (MPI_OP_NULL == op) {
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err = MPI_ERR_OP;
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} else if (!ompi_op_is_valid(op, datatype, &msg, FUNC_NAME)) {
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int ret = OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_OP, msg);
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free(msg);
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return ret;
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} else if ((MPI_IN_PLACE == sendbuf && OMPI_COMM_IS_INTER(comm)) ||
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MPI_IN_PLACE == recvbuf ) {
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return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_BUFFER,
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FUNC_NAME);
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} else if( (sendbuf == recvbuf) &&
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(MPI_BOTTOM != sendbuf) &&
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(count > 1) ) {
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return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_BUFFER,
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FUNC_NAME);
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} else {
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OMPI_CHECK_DATATYPE_FOR_SEND(err, datatype, count);
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}
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OMPI_ERRHANDLER_CHECK(err, comm, err, FUNC_NAME);
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}
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/* MPI-1, p114, says that each process must supply at least
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one element. But at least the Pallas benchmarks call
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MPI_REDUCE with a count of 0. So be sure to handle it. */
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if (0 == count) {
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return MPI_SUCCESS;
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}
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OPAL_CR_ENTER_LIBRARY();
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/* Invoke the coll component to perform the back-end operation */
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OBJ_RETAIN(op);
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err = comm->c_coll->coll_allreduce(sendbuf, recvbuf, count,
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datatype, op, comm,
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comm->c_coll->coll_allreduce_module);
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OBJ_RELEASE(op);
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OMPI_ERRHANDLER_RETURN(err, comm, err, FUNC_NAME);
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}
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