e8c103ac1f
if the count/sum of counts is 0. This is technically in violation of the MPI-1 standard, but... :-( This commit was SVN r6914.
88 строки
2.6 KiB
C
88 строки
2.6 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 <stdio.h>
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#include "mpi.h"
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#include "datatype/datatype.h"
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#include "mpi/c/bindings.h"
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#include "mca/coll/coll.h"
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#include "errhandler/errhandler.h"
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#include "communicator/communicator.h"
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#include "op/op.h"
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#if OMPI_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
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#pragma weak MPI_Reduce = PMPI_Reduce
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#endif
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#if OMPI_PROFILING_DEFINES
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#include "mpi/c/profile/defines.h"
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#endif
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static const char FUNC_NAME[] = "MPI_Reduce";
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int MPI_Reduce(void *sendbuf, void *recvbuf, int count,
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MPI_Datatype datatype, MPI_Op op, int root, MPI_Comm comm)
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{
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int err;
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if (MPI_PARAM_CHECK) {
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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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}
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/* Checks for all ranks */
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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_intrinsic(op) &&
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datatype->id < DT_MAX_PREDEFINED &&
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-1 == ompi_op_ddt_map[datatype->id]) {
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err = MPI_ERR_OP;
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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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/* Intercommunicator errors */
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if (!OMPI_COMM_IS_INTRA(comm)) {
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if (! ((root >= 0 && root < ompi_comm_remote_size(comm)) ||
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MPI_ROOT == root || MPI_PROC_NULL == root)) {
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return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_ROOT, FUNC_NAME);
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}
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}
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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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/* Invoke the coll component to perform the back-end operation */
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err = comm->c_coll.coll_reduce(sendbuf, recvbuf, count,
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datatype, op, root, comm);
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OMPI_ERRHANDLER_RETURN(err, comm, err, FUNC_NAME);
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}
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