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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) 2017-2022 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"
#include "coll_basic.h"
/*
* scatterv_intra
*
* Function: - scatterv operation
* Accepts: - same arguments as MPI_Scatterv()
* Returns: - MPI_SUCCESS or error code
*/
int
mca_coll_basic_scatterv_intra(const void *sbuf, const int *scounts,
const int *disps, struct ompi_datatype_t *sdtype,
void *rbuf, int rcount,
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 sdsize;
/* Initialize */
rank = ompi_comm_rank(comm);
size = ompi_comm_size(comm);
/* If not root, receive data. */
if (rank != root) {
size_t rdsize;
ompi_datatype_type_size(rdtype, &rdsize);
/* Only receive if there is something to receive */
if (rcount > 0 && rdsize > 0) {
return MCA_PML_CALL(recv(rbuf, rcount, rdtype,
root, MCA_COLL_BASE_TAG_SCATTERV,
comm, MPI_STATUS_IGNORE));
}
return MPI_SUCCESS;
}
ompi_datatype_type_size(sdtype, &sdsize);
if (OPAL_UNLIKELY(0 == sdsize)) {
/* bozzo case */
return MPI_SUCCESS;
}
/* I am the root, loop sending data. */
err = ompi_datatype_get_extent(sdtype, &lb, &extent);
if (OMPI_SUCCESS != err) {
return OMPI_ERROR;
}
for (i = 0; i < size; ++i) {
ptmp = ((char *) sbuf) + (extent * disps[i]);
/* simple optimization */
if (i == rank) {
/* simple optimization or a local operation */
if (scounts[i] > 0 && MPI_IN_PLACE != rbuf) {
err = ompi_datatype_sndrcv(ptmp, scounts[i], sdtype, rbuf, rcount,
rdtype);
if (MPI_SUCCESS != err) {
return err;
}
}
} else {
/* Only send if there is something to send */
if (scounts[i] > 0) {
err = MCA_PML_CALL(send(ptmp, scounts[i], sdtype, i,
MCA_COLL_BASE_TAG_SCATTERV,
MCA_PML_BASE_SEND_STANDARD, comm));
if (MPI_SUCCESS != err) {
return err;
}
}
}
}
/* All done */
return MPI_SUCCESS;
}
/*
* scatterv_inter
*
* Function: - scatterv operation
* Accepts: - same arguments as MPI_Scatterv()
* Returns: - MPI_SUCCESS or error code
*/
int
mca_coll_basic_scatterv_inter(const void *sbuf, const int *scounts,
const int *disps, struct ompi_datatype_t *sdtype,
void *rbuf, int rcount,
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;
/* Initialize */
size = ompi_comm_remote_size(comm);
/* If not root, receive data. Note that we will only get here if
* rcount > 0 or rank == root. */
if (MPI_PROC_NULL == root) {
/* do nothing */
err = OMPI_SUCCESS;
} else if (MPI_ROOT != root) {
/* If not root, receive data. */
err = MCA_PML_CALL(recv(rbuf, rcount, rdtype,
root, MCA_COLL_BASE_TAG_SCATTERV,
comm, MPI_STATUS_IGNORE));
} else {
/* I am the root, loop sending data. */
err = ompi_datatype_get_extent(sdtype, &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 *) sbuf) + (extent * disps[i]);
err = MCA_PML_CALL(isend(ptmp, scounts[i], sdtype, i,
MCA_COLL_BASE_TAG_SCATTERV,
MCA_PML_BASE_SEND_STANDARD, 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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