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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) 2013 FUJITSU LIMITED. 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"
/*
* alltoallv_inter
*
* Function: - MPI_Alltoallv
* Accepts: - same as MPI_Alltoallv()
* Returns: - MPI_SUCCESS or an MPI error code
*/
int
mca_coll_basic_alltoallv_inter(const void *sbuf, const int *scounts, const int *sdisps,
struct ompi_datatype_t *sdtype, void *rbuf,
const int *rcounts, const int *rdisps,
struct ompi_datatype_t *rdtype,
struct ompi_communicator_t *comm,
mca_coll_base_module_t *module)
{
int i;
int rsize;
int err;
char *psnd;
char *prcv;
size_t nreqs;
MPI_Aint sndextent;
MPI_Aint rcvextent;
ompi_request_t **preq;
/* Initialize. */
rsize = ompi_comm_remote_size(comm);
ompi_datatype_type_extent(sdtype, &sndextent);
ompi_datatype_type_extent(rdtype, &rcvextent);
/* Initiate all send/recv to/from others. */
nreqs = rsize * 2;
preq = ompi_coll_base_comm_get_reqs(module->base_data, nreqs);
if( NULL == preq ) { return OMPI_ERR_OUT_OF_RESOURCE; }
/* Post all receives first */
/* A simple optimization: do not send and recv msgs of length zero */
for (i = 0; i < rsize; ++i) {
prcv = ((char *) rbuf) + (rdisps[i] * rcvextent);
if (rcounts[i] > 0) {
err = MCA_PML_CALL(irecv(prcv, rcounts[i], rdtype,
i, MCA_COLL_BASE_TAG_ALLTOALLV, comm,
&preq[i]));
if (MPI_SUCCESS != err) {
ompi_coll_base_free_reqs(preq, i + 1);
return err;
}
}
}
/* Now post all sends */
for (i = 0; i < rsize; ++i) {
psnd = ((char *) sbuf) + (sdisps[i] * sndextent);
if (scounts[i] > 0) {
err = MCA_PML_CALL(isend(psnd, scounts[i], sdtype,
i, MCA_COLL_BASE_TAG_ALLTOALLV,
MCA_PML_BASE_SEND_STANDARD, comm,
&preq[rsize + i]));
if (MPI_SUCCESS != err) {
ompi_coll_base_free_reqs(preq, rsize + i + 1);
return err;
}
}
}
err = ompi_request_wait_all(nreqs, preq, MPI_STATUSES_IGNORE);
if (MPI_SUCCESS != err) {
ompi_coll_base_free_reqs(preq, nreqs);
}
/* All done */
return err;
}
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