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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) 2006-2010 University of Houston. All rights reserved.
* Copyright (c) 2015-2017 Research Organization for Information Science
* and Technology (RIST). All rights reserved.
* Copyright (c) 2022 IBM Corporation. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include "coll_inter.h"
#include <stdlib.h>
#include "mpi.h"
#include "ompi/constants.h"
#include "ompi/datatype/ompi_datatype.h"
#include "ompi/communicator/communicator.h"
#include "ompi/mca/coll/coll.h"
#include "ompi/mca/pml/pml.h"
#include "ompi/mca/coll/base/coll_tags.h"
#include "ompi/mca/coll/base/coll_base_util.h"
/*
* allgather_inter
*
* Function: - allgather using other MPI collections
* Accepts: - same as MPI_Allgather()
* Returns: - MPI_SUCCESS or error code
*/
int
mca_coll_inter_allgather_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 rank, root = 0, size, rsize, err = OMPI_SUCCESS, i;
char *ptmp_free = NULL, *ptmp = NULL;
ptrdiff_t gap, span;
void *rbuf_ptr;
rank = ompi_comm_rank(comm);
size = ompi_comm_size(comm->c_local_comm);
rsize = ompi_comm_remote_size(comm);
/* Perform the gather locally at the root */
if ( scount > 0 ) {
span = opal_datatype_span(&sdtype->super, (int64_t)scount*(int64_t)size, &gap);
ptmp_free = (char*)malloc(span);
if (NULL == ptmp_free) {
return OMPI_ERR_OUT_OF_RESOURCE;
}
ptmp = ptmp_free - gap;
err = comm->c_local_comm->c_coll->coll_gather(sbuf, scount, sdtype,
ptmp, scount, sdtype,
0, comm->c_local_comm,
comm->c_local_comm->c_coll->coll_gather_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(ptmp, scount*(size_t)size, sdtype, 0,
MCA_COLL_BASE_TAG_ALLGATHER,
rbuf, rcount*(size_t)rsize, rdtype, 0,
MCA_COLL_BASE_TAG_ALLGATHER,
comm, MPI_STATUS_IGNORE);
if (OMPI_SUCCESS != err) {
goto exit;
}
}
/* bcast the message to all the local processes */
if ( rcount > 0 ) {
if ( OPAL_UNLIKELY(rcount*(size_t)rsize > INT_MAX) ) {
// Sending the message in the coll_bcast as "rcount*rsize" would exceed
// the 'int count' parameter in the coll_bcast() function. Instead broadcast
// the result in "rcount" chunks to the local group.
span = opal_datatype_span(&rdtype->super, rcount, &gap);
for( i = 0; i < rsize; ++i) {
rbuf_ptr = (char*)rbuf + span * (size_t)i;
err = comm->c_local_comm->c_coll->coll_bcast(rbuf_ptr, rcount, rdtype,
root, comm->c_local_comm,
comm->c_local_comm->c_coll->coll_bcast_module);
if (OMPI_SUCCESS != err) {
goto exit;
}
}
} else {
err = comm->c_local_comm->c_coll->coll_bcast(rbuf, rcount*rsize, rdtype,
root, comm->c_local_comm,
comm->c_local_comm->c_coll->coll_bcast_module);
if (OMPI_SUCCESS != err) {
goto exit;
}
}
}
exit:
if (NULL != ptmp_free) {
free(ptmp_free);
}
return err;
}
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