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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) 2004-2016 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) 2015-2021 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"
/*
* gatherv_intra
*
* Function: - basic gatherv operation
* Accepts: - same arguments as MPI_Gatherv()
* Returns: - MPI_SUCCESS or error code
*/
int
mca_coll_basic_gatherv_intra(const void *sbuf, int scount,
struct ompi_datatype_t *sdtype,
void *rbuf, const int *rcounts, const int *disps,
struct ompi_datatype_t *rdtype, int root,
struct ompi_communicator_t *comm,
mca_coll_base_module_t *module)
{
int i, rank, size, err;
char *ptmp;
ptrdiff_t lb, extent;
size_t rdsize;
size = ompi_comm_size(comm);
rank = ompi_comm_rank(comm);
/* Everyone but root sends data and returns. Don't send anything
for sendcounts of 0 (even though MPI_Gatherv has a guard for 0
counts, this routine is used elsewhere, like the implementation
of allgatherv, so it's possible to get here with a scount of
0) */
if (rank != root) {
size_t sdsize;
ompi_datatype_type_size(sdtype, &sdsize);
if (scount > 0 && sdsize > 0) {
return MCA_PML_CALL(send(sbuf, scount, sdtype, root,
MCA_COLL_BASE_TAG_GATHERV,
MCA_PML_BASE_SEND_STANDARD, comm));
}
return MPI_SUCCESS;
}
/* I am the root, loop receiving data. */
ompi_datatype_type_size(rdtype, &rdsize);
if (OPAL_UNLIKELY(0 == rdsize)) {
/* bozzo case */
return MPI_SUCCESS;
}
err = ompi_datatype_get_extent(rdtype, &lb, &extent);
if (OMPI_SUCCESS != err) {
return OMPI_ERROR;
}
for (i = 0; i < size; ++i) {
ptmp = ((char *) rbuf) + (extent * disps[i]);
if (i == rank) {
/* simple optimization */
if (MPI_IN_PLACE != sbuf && (0 < scount) && (0 < rcounts[i])) {
err = ompi_datatype_sndrcv(sbuf, scount, sdtype,
ptmp, rcounts[i], rdtype);
}
} else {
/* Only receive if there is something to receive */
if (rcounts[i] > 0) {
err = MCA_PML_CALL(recv(ptmp, rcounts[i], rdtype, i,
MCA_COLL_BASE_TAG_GATHERV,
comm, MPI_STATUS_IGNORE));
}
}
if (MPI_SUCCESS != err) {
return err;
}
}
/* All done */
return MPI_SUCCESS;
}
/*
* gatherv_inter
*
* Function: - basic gatherv operation
* Accepts: - same arguments as MPI_Gatherv()
* Returns: - MPI_SUCCESS or error code
*/
int
mca_coll_basic_gatherv_inter(const void *sbuf, int scount,
struct ompi_datatype_t *sdtype,
void *rbuf, const int *rcounts, const int *disps,
struct ompi_datatype_t *rdtype, int root,
struct ompi_communicator_t *comm,
mca_coll_base_module_t *module)
{
int i, size, err;
char *ptmp;
ptrdiff_t lb, extent;
ompi_request_t **reqs = NULL;
size = ompi_comm_remote_size(comm);
/* If not root, receive data. Note that we will only get here if
* scount > 0 or rank == root. */
if (MPI_PROC_NULL == root) {
/* do nothing */
err = OMPI_SUCCESS;
} else if (MPI_ROOT != root) {
/* Everyone but root sends data and returns. */
err = MCA_PML_CALL(send(sbuf, scount, sdtype, root,
MCA_COLL_BASE_TAG_GATHERV,
MCA_PML_BASE_SEND_STANDARD, comm));
} else {
/* I am the root, loop receiving data. */
err = ompi_datatype_get_extent(rdtype, &lb, &extent);
if (OMPI_SUCCESS != err) {
return OMPI_ERROR;
}
reqs = ompi_coll_base_comm_get_reqs(module->base_data, size);
if( NULL == reqs ) { return OMPI_ERR_OUT_OF_RESOURCE; }
for (i = 0; i < size; ++i) {
ptmp = ((char *) rbuf) + (extent * disps[i]);
err = MCA_PML_CALL(irecv(ptmp, rcounts[i], rdtype, i,
MCA_COLL_BASE_TAG_GATHERV,
comm, &reqs[i]));
if (OMPI_SUCCESS != err) {
ompi_coll_base_free_reqs(reqs, i + 1);
return err;
}
}
err = ompi_request_wait_all(size, reqs, MPI_STATUSES_IGNORE);
if (OMPI_SUCCESS != err) {
ompi_coll_base_free_reqs(reqs, size);
}
}
/* All done */
return err;
}
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