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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) 2004-2020 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) 2006 Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2010-2012 Oak Ridge National Labs. 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_Reduce = PMPI_Reduce
#endif
#define MPI_Reduce PMPI_Reduce
#endif
static const char FUNC_NAME[] = "MPI_Reduce";
int MPI_Reduce(const void *sendbuf, void *recvbuf, int count,
MPI_Datatype datatype, MPI_Op op, int root, MPI_Comm comm)
{
int err;
SPC_RECORD(OMPI_SPC_REDUCE, 1);
MEMCHECKER(
memchecker_datatype(datatype);
memchecker_comm(comm);
if(OMPI_COMM_IS_INTRA(comm)) {
if(ompi_comm_rank(comm) == root) {
/* check whether root's 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);
}
/* check whether root's receive buffer is addressable. */
memchecker_call(&opal_memchecker_base_isaddressable, recvbuf, count, datatype);
} else {
/* check whether send buffer is defined on other processes. */
memchecker_call(&opal_memchecker_base_isdefined, sendbuf, count, datatype);
}
} else {
if (MPI_ROOT == root) {
/* check whether root's receive buffer is addressable. */
memchecker_call(&opal_memchecker_base_isaddressable, recvbuf, count, datatype);
} else if (MPI_PROC_NULL != root) {
/* check whether send buffer is defined. */
memchecker_call(&opal_memchecker_base_isdefined, sendbuf, count, datatype);
}
}
);
if (MPI_PARAM_CHECK) {
char *msg;
err = MPI_SUCCESS;
OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
if (ompi_comm_invalid(comm)) {
return OMPI_ERRHANDLER_NOHANDLE_INVOKE(MPI_ERR_COMM,
FUNC_NAME);
}
/* Checks for all ranks */
else if (MPI_OP_NULL == 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 ((ompi_comm_rank(comm) != root && MPI_IN_PLACE == sendbuf) ||
(ompi_comm_rank(comm) == root && ((MPI_IN_PLACE == recvbuf) ||
((sendbuf == recvbuf) && (0 != count))))) {
err = MPI_ERR_ARG;
} else {
OMPI_CHECK_DATATYPE_FOR_SEND(err, datatype, count);
}
OMPI_ERRHANDLER_CHECK(err, comm, err, FUNC_NAME);
/* Intercommunicator errors */
if (!OMPI_COMM_IS_INTRA(comm)) {
if (! ((root >= 0 && root < ompi_comm_remote_size(comm)) ||
MPI_ROOT == root || MPI_PROC_NULL == root)) {
return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_ROOT, FUNC_NAME);
}
}
/* Intracommunicator errors */
else {
if (root < 0 || root >= ompi_comm_size(comm)) {
return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_ROOT, FUNC_NAME);
}
}
}
#if OPAL_ENABLE_FT_MPI
/*
* An early check, so as to return early if we are using a broken
* communicator. This is not absolutely necessary since we will
* check for this, and other, error conditions during the operation.
*/
if( OPAL_UNLIKELY(!ompi_comm_iface_coll_check(comm, &err)) ) {
OMPI_ERRHANDLER_RETURN(err, comm, err, FUNC_NAME);
}
#endif
/* Do we need to do anything? (MPI says that reductions have to
have a count of at least 1, but at least IMB calls reduce with
a count of 0 -- blah!) */
if (0 == count) {
return MPI_SUCCESS;
}
/* Invoke the coll component to perform the back-end operation */
OBJ_RETAIN(op);
err = comm->c_coll->coll_reduce(sendbuf, recvbuf, count,
datatype, op, root, comm,
comm->c_coll->coll_reduce_module);
OBJ_RELEASE(op);
OMPI_ERRHANDLER_RETURN(err, comm, err, FUNC_NAME);
}
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