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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
/*
* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2016 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2005 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) 2014-2015 Research Organization for Information Science
* and Technology (RIST). All rights reserved.
* Copyright (c) 2017 IBM Corporation. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include "coll_basic.h"
#include "mpi.h"
#include "ompi/constants.h"
#include "ompi/datatype/ompi_datatype.h"
#include "ompi/mca/coll/coll.h"
#include "ompi/mca/coll/base/coll_tags.h"
#include "ompi/mca/pml/pml.h"
/*
* alltoall_inter
*
* Function: - MPI_Alltoall
* Accepts: - same as MPI_Alltoall()
* Returns: - MPI_SUCCESS or an MPI error code
*/
int
mca_coll_basic_alltoall_inter(const void *sbuf, int scount,
struct ompi_datatype_t *sdtype,
void *rbuf, int rcount,
struct ompi_datatype_t *rdtype,
struct ompi_communicator_t *comm,
mca_coll_base_module_t *module)
{
int i;
int size;
int err;
int nreqs;
char *psnd;
char *prcv;
MPI_Aint lb;
MPI_Aint sndinc;
MPI_Aint rcvinc;
ompi_request_t **req, **sreq, **rreq;
/* Initialize. */
size = ompi_comm_remote_size(comm);
err = ompi_datatype_get_extent(sdtype, &lb, &sndinc);
if (OMPI_SUCCESS != err) {
return err;
}
sndinc *= scount;
err = ompi_datatype_get_extent(rdtype, &lb, &rcvinc);
if (OMPI_SUCCESS != err) {
return err;
}
rcvinc *= rcount;
/* Initiate all send/recv to/from others. */
nreqs = size * 2;
req = rreq = ompi_coll_base_comm_get_reqs( module->base_data, nreqs);
if( NULL == req ) { return OMPI_ERR_OUT_OF_RESOURCE; }
sreq = rreq + size;
prcv = (char *) rbuf;
psnd = (char *) sbuf;
/* Post all receives first */
for (i = 0; i < size; i++, ++rreq) {
err = MCA_PML_CALL(irecv(prcv + (i * rcvinc), rcount, rdtype, i,
MCA_COLL_BASE_TAG_ALLTOALL, comm, rreq));
if (OMPI_SUCCESS != err) {
ompi_coll_base_free_reqs(req, i + 1);
return err;
}
}
/* Now post all sends */
for (i = 0; i < size; i++, ++sreq) {
err = MCA_PML_CALL(isend(psnd + (i * sndinc), scount, sdtype, i,
MCA_COLL_BASE_TAG_ALLTOALL,
MCA_PML_BASE_SEND_STANDARD, comm, sreq));
if (OMPI_SUCCESS != err) {
ompi_coll_base_free_reqs(req, i + size + 1);
return err;
}
}
/* Wait for them all. If there's an error, note that we don't
* care what the error was -- just that there *was* an error. The
* PML will finish all requests, even if one or more of them fail.
* i.e., by the end of this call, all the requests are free-able.
* So free them anyway -- even if there was an error, and return
* the error after we free everything. */
err = ompi_request_wait_all(nreqs, req, MPI_STATUSES_IGNORE);
if (OMPI_SUCCESS != err) {
ompi_coll_base_free_reqs(req, nreqs);
}
/* All done */
return err;
}
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