128 строки
4.7 KiB
C
128 строки
4.7 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) 2004-2005 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) 2004-2008 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) 2007 Cisco Systems, Inc. All rights reserved.
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* Copyright (c) 2010 University of Houston. 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/memchecker.h"
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#if OPAL_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
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#pragma weak MPI_Allgather = PMPI_Allgather
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#endif
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#if OMPI_PROFILING_DEFINES
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#include "ompi/mpi/c/profile/defines.h"
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#endif
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static const char FUNC_NAME[] = "MPI_Allgather";
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int MPI_Allgather(const void *sendbuf, int sendcount, MPI_Datatype sendtype,
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void *recvbuf, int recvcount, MPI_Datatype recvtype,
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MPI_Comm comm)
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{
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int err;
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MEMCHECKER(
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int rank;
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ptrdiff_t ext;
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rank = ompi_comm_rank(comm);
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ompi_datatype_type_extent(recvtype, &ext);
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memchecker_datatype(recvtype);
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memchecker_comm(comm);
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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,
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(char *)(recvbuf)+rank*ext,
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recvcount, recvtype);
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} else {
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memchecker_datatype(sendtype);
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memchecker_call(&opal_memchecker_base_isdefined, sendbuf, sendcount, sendtype);
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}
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/* check whether the receive buffer is addressable. */
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memchecker_call(&opal_memchecker_base_isaddressable, recvbuf, recvcount, recvtype);
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);
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if (MPI_PARAM_CHECK) {
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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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OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_COMM, FUNC_NAME);
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} else if (MPI_DATATYPE_NULL == recvtype || NULL == recvtype) {
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err = MPI_ERR_TYPE;
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} else if (recvcount < 0) {
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err = MPI_ERR_COUNT;
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} else if (MPI_IN_PLACE == recvbuf) {
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return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_ARG, FUNC_NAME);
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} else if (MPI_IN_PLACE != sendbuf) {
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OMPI_CHECK_DATATYPE_FOR_SEND(err, sendtype, sendcount);
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}
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OMPI_ERRHANDLER_CHECK(err, comm, err, FUNC_NAME);
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}
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/* Do we need to do anything? Everyone had to give the same send
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signature, which means that everyone must have given a
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sendcount > 0 if there's anything to send for the intra-communicator
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case. If we're doing IN_PLACE, however, check recvcount,
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not sendcount. */
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if ( OMPI_COMM_IS_INTRA(comm) ) {
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if ((MPI_IN_PLACE != sendbuf && 0 == sendcount) ||
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(0 == recvcount)) {
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return MPI_SUCCESS;
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}
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}
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else if ( OMPI_COMM_IS_INTER(comm) ){
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/* for inter comunicators, the communication pattern
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need not be symmetric. Specifically, one group is
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allows to have sendcount=0, while the other has
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a valid sendcount. Thus, the only way not to do
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anything is if both sendcount and recvcount are zero. */
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if ( 0 == sendcount && 0 == recvcount ) {
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return MPI_SUCCESS;
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}
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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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err = comm->c_coll.coll_allgather(sendbuf, sendcount, sendtype,
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recvbuf, recvcount, recvtype, comm,
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comm->c_coll.coll_allgather_module);
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OMPI_ERRHANDLER_RETURN(err, comm, err, FUNC_NAME);
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}
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