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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
/*
* Copyright (c) 2004-2007 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2018 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2008 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* Copyright (c) 2004-2005 The Regents of the University of California.
* All rights reserved.
* Copyright (c) 2013 Los Alamos National Security, LLC. All rights
* reserved.
* Copyright (c) 2015 Research Organization for Information Science
* and Technology (RIST). All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include <stdio.h>
#include "ompi/mpi/c/bindings.h"
#include "ompi/runtime/params.h"
#include "ompi/communicator/communicator.h"
#include "ompi/errhandler/errhandler.h"
#include "ompi/datatype/ompi_datatype.h"
#include "ompi/op/op.h"
#include "ompi/memchecker.h"
#include "ompi/runtime/ompi_spc.h"
#if OMPI_BUILD_MPI_PROFILING
#if OPAL_HAVE_WEAK_SYMBOLS
#pragma weak MPI_Allreduce = PMPI_Allreduce
#endif
#define MPI_Allreduce PMPI_Allreduce
#endif
static const char FUNC_NAME[] = "MPI_Allreduce";
int MPI_Allreduce(const void *sendbuf, void *recvbuf, int count,
MPI_Datatype datatype, MPI_Op op, MPI_Comm comm)
{
int err;
SPC_RECORD(OMPI_SPC_ALLREDUCE, 1);
MEMCHECKER(
memchecker_datatype(datatype);
memchecker_comm(comm);
/* check whether receive buffer is defined. */
memchecker_call(&opal_memchecker_base_isaddressable, recvbuf, count, datatype);
/* check whether the actual send buffer is defined. */
if (MPI_IN_PLACE == sendbuf) {
memchecker_call(&opal_memchecker_base_isdefined, recvbuf, count, datatype);
} else {
memchecker_call(&opal_memchecker_base_isdefined, sendbuf, count, datatype);
}
);
if (MPI_PARAM_CHECK) {
char *msg;
/* Unrooted operation -- same checks for all ranks on both
intracommunicators and intercommunicators */
err = MPI_SUCCESS;
OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
if (ompi_comm_invalid(comm)) {
return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_COMM,
FUNC_NAME);
} else if (MPI_OP_NULL == op) {
err = MPI_ERR_OP;
} else if (!ompi_op_is_valid(op, datatype, &msg, FUNC_NAME)) {
int ret = OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_OP, msg);
free(msg);
return ret;
} else if ((MPI_IN_PLACE == sendbuf && OMPI_COMM_IS_INTER(comm)) ||
MPI_IN_PLACE == recvbuf ) {
return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_BUFFER,
FUNC_NAME);
} else if( (sendbuf == recvbuf) &&
(MPI_BOTTOM != sendbuf) &&
(count > 1) ) {
return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_BUFFER,
FUNC_NAME);
} else {
OMPI_CHECK_DATATYPE_FOR_SEND(err, datatype, count);
}
OMPI_ERRHANDLER_CHECK(err, comm, err, FUNC_NAME);
}
/* MPI-1, p114, says that each process must supply at least
one element. But at least the Pallas benchmarks call
MPI_REDUCE with a count of 0. So be sure to handle it. */
if (0 == count) {
return MPI_SUCCESS;
}
OPAL_CR_ENTER_LIBRARY();
/* Invoke the coll component to perform the back-end operation */
OBJ_RETAIN(op);
err = comm->c_coll->coll_allreduce(sendbuf, recvbuf, count,
datatype, op, comm,
comm->c_coll->coll_allreduce_module);
OBJ_RELEASE(op);
OMPI_ERRHANDLER_RETURN(err, comm, err, FUNC_NAME);
}
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