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/*
* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2017 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) 2006-2007 University of Houston. All rights reserved.
* Copyright (c) 2013 Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2015-2017 Research Organization for Information Science
* and Technology (RIST). All rights reserved.
* Copyright (c) 2023 Jeffrey M. Squyres. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include "coll_inter.h"
#include "mpi.h"
#include "ompi/constants.h"
#include "ompi/datatype/ompi_datatype.h"
#include "ompi/communicator/communicator.h"
#include "ompi/op/op.h"
#include "ompi/mca/coll/coll.h"
#include "ompi/mca/coll/base/coll_tags.h"
#include "ompi/mca/coll/base/coll_base_util.h"
#include "ompi/mca/pml/pml.h"
/*
* allreduce_inter
*
* Function: - allreduce using other MPI collectives
* Accepts: - same as MPI_Allreduce()
* Returns: - MPI_SUCCESS or error code
*/
int
mca_coll_inter_allreduce_inter(const void *sbuf, void *rbuf, int count,
struct ompi_datatype_t *dtype,
struct ompi_op_t *op,
struct ompi_communicator_t *comm,
mca_coll_base_module_t *module)
{
int err, rank, root = 0;
char *tmpbuf = NULL, *pml_buffer = NULL;
const char *source;
ptrdiff_t gap, span;
rank = ompi_comm_rank(comm);
/* Perform the reduction locally */
span = opal_datatype_span(&dtype->super, count, &gap);
tmpbuf = (char *) malloc(span);
if (NULL == tmpbuf) {
return OMPI_ERR_OUT_OF_RESOURCE;
}
pml_buffer = tmpbuf - gap;
source = (MPI_IN_PLACE == sbuf) ? rbuf : sbuf;
err = comm->c_local_comm->c_coll->coll_reduce(source, pml_buffer, count,
dtype, op, root,
comm->c_local_comm,
comm->c_local_comm->c_coll->coll_reduce_module);
if (OMPI_SUCCESS != err) {
goto exit;
}
if (rank == root) {
/* Do a send-recv between the two root procs. to avoid deadlock */
err = ompi_coll_base_sendrecv_actual(pml_buffer, count, dtype, 0,
MCA_COLL_BASE_TAG_ALLREDUCE,
rbuf, count, dtype, 0,
MCA_COLL_BASE_TAG_ALLREDUCE,
comm, MPI_STATUS_IGNORE);
if (OMPI_SUCCESS != err) {
goto exit;
}
}
/* bcast the message to all the local processes */
err = comm->c_local_comm->c_coll->coll_bcast(rbuf, count, dtype,
root, comm->c_local_comm,
comm->c_local_comm->c_coll->coll_bcast_module);
if (OMPI_SUCCESS != err) {
goto exit;
}
exit:
if (NULL != tmpbuf) {
free(tmpbuf);
}
return err;
}
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