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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) 2007 Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2010 University of Houston. 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) 2015-2018 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/memchecker.h"
#include "ompi/runtime/ompi_spc.h"
#if OMPI_BUILD_MPI_PROFILING
#if OPAL_HAVE_WEAK_SYMBOLS
#pragma weak MPI_Allgather = PMPI_Allgather
#endif
#define MPI_Allgather PMPI_Allgather
#endif
static const char FUNC_NAME[] = "MPI_Allgather";
int MPI_Allgather(const void *sendbuf, int sendcount, MPI_Datatype sendtype,
void *recvbuf, int recvcount, MPI_Datatype recvtype,
MPI_Comm comm)
{
int err;
SPC_RECORD(OMPI_SPC_ALLGATHER, 1);
MEMCHECKER(
int rank;
ptrdiff_t ext;
rank = ompi_comm_rank(comm);
ompi_datatype_type_extent(recvtype, &ext);
memchecker_datatype(recvtype);
memchecker_comm(comm);
/* check whether the actual send buffer is defined. */
if (MPI_IN_PLACE == sendbuf) {
memchecker_call(&opal_memchecker_base_isdefined,
(char *)(recvbuf)+rank*recvcount*ext,
recvcount, recvtype);
} else {
memchecker_datatype(sendtype);
memchecker_call(&opal_memchecker_base_isdefined, sendbuf, sendcount, sendtype);
}
/* check whether the receive buffer is addressable. */
memchecker_call(&opal_memchecker_base_isaddressable, recvbuf, recvcount, recvtype);
);
if (MPI_PARAM_CHECK) {
/* 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)) {
OMPI_ERRHANDLER_NOHANDLE_INVOKE(MPI_ERR_COMM, FUNC_NAME);
} else if (MPI_DATATYPE_NULL == recvtype || NULL == recvtype) {
err = MPI_ERR_TYPE;
} else if (recvcount < 0) {
err = MPI_ERR_COUNT;
} else if ((MPI_IN_PLACE == sendbuf && OMPI_COMM_IS_INTER(comm)) ||
MPI_IN_PLACE == recvbuf) {
return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_ARG, FUNC_NAME);
} else if (MPI_IN_PLACE != sendbuf) {
OMPI_CHECK_DATATYPE_FOR_SEND(err, sendtype, sendcount);
}
OMPI_ERRHANDLER_CHECK(err, comm, err, 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? Everyone had to give the same send
signature, which means that everyone must have given a
sendcount > 0 if there's anything to send for the intra-communicator
case. If we're doing IN_PLACE, however, check recvcount,
not sendcount. */
if ( OMPI_COMM_IS_INTRA(comm) ) {
if ((MPI_IN_PLACE != sendbuf && 0 == sendcount) ||
(0 == recvcount)) {
return MPI_SUCCESS;
}
}
else if ( OMPI_COMM_IS_INTER(comm) ){
/* for inter comunicators, the communication pattern
need not be symmetric. Specifically, one group is
allows to have sendcount=0, while the other has
a valid sendcount. Thus, the only way not to do
anything is if both sendcount and recvcount are zero. */
if ( 0 == sendcount && 0 == recvcount ) {
return MPI_SUCCESS;
}
}
/* Invoke the coll component to perform the back-end operation */
err = comm->c_coll->coll_allgather(sendbuf, sendcount, sendtype,
recvbuf, recvcount, recvtype, comm,
comm->c_coll->coll_allgather_module);
OMPI_ERRHANDLER_RETURN(err, comm, err, FUNC_NAME);
}
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