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openmpi/src/mca/coll/basic/coll_basic_scatter.c

153 строки
3.9 KiB
C
Исходник Обычный вид История

/*
* Copyright (c) 2004-2005 The Trustees of Indiana University.
* All rights reserved.
* Copyright (c) 2004-2005 The Trustees of the University of Tennessee.
* All rights reserved.
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include "coll_basic.h"
#include "mpi.h"
#include "include/constants.h"
#include "mca/coll/coll.h"
#include "mca/coll/base/coll_tags.h"
#include "mca/pml/pml.h"
#include "coll_basic.h"
/*
* scatter_intra
*
* Function: - scatter operation
* Accepts: - same arguments as MPI_Scatter()
* Returns: - MPI_SUCCESS or error code
*/
int mca_coll_basic_scatter_intra(void *sbuf, int scount,
struct ompi_datatype_t *sdtype,
void *rbuf, int rcount,
struct ompi_datatype_t *rdtype,
int root,
struct ompi_communicator_t *comm)
{
int i;
int rank;
int size;
int err;
char *ptmp;
long lb;
long incr;
/* Initialize */
rank = ompi_comm_rank(comm);
size = ompi_comm_size(comm);
/* If not root, receive data. */
if (rank != root) {
err = mca_pml.pml_recv(rbuf, rcount, rdtype, root,
MCA_COLL_BASE_TAG_SCATTER,
comm, MPI_STATUS_IGNORE);
return err;
}
/* I am the root, loop sending data. */
err = ompi_ddt_get_extent(rdtype, &lb, &incr);
if (OMPI_SUCCESS != err) {
return OMPI_ERROR;
}
incr *= scount;
for (i = 0, ptmp = (char *) sbuf; i < size; ++i, ptmp += incr) {
/* simple optimization */
if (i == rank) {
err = ompi_ddt_sndrcv(ptmp, scount, sdtype, rbuf, rcount, rdtype);
} else {
err = mca_pml.pml_send(ptmp, scount, sdtype, i,
MCA_COLL_BASE_TAG_SCATTER,
MCA_PML_BASE_SEND_STANDARD, comm);
}
if (MPI_SUCCESS != err) {
return err;
}
}
/* All done */
return MPI_SUCCESS;
}
/*
* scatter_inter
*
* Function: - scatter operation
* Accepts: - same arguments as MPI_Scatter()
* Returns: - MPI_SUCCESS or error code
*/
int mca_coll_basic_scatter_inter(void *sbuf, int scount,
struct ompi_datatype_t *sdtype,
void *rbuf, int rcount,
struct ompi_datatype_t *rdtype,
int root,
struct ompi_communicator_t *comm)
{
int i;
int rank;
int size;
int err;
char *ptmp;
long lb;
long incr;
ompi_request_t **reqs=comm->c_coll_basic_data->mccb_reqs;
/* Initialize */
rank = ompi_comm_rank(comm);
size = ompi_comm_remote_size(comm);
if ( MPI_PROC_NULL == root ) {
/* do nothing */
err = OMPI_SUCCESS;
}
else if ( MPI_ROOT != root ) {
/* If not root, receive data. */
err = mca_pml.pml_recv(rbuf, rcount, rdtype, root,
MCA_COLL_BASE_TAG_SCATTER,
comm, MPI_STATUS_IGNORE);
}
else{
/* I am the root, loop sending data. */
err = ompi_ddt_get_extent(rdtype, &lb, &incr);
if (OMPI_SUCCESS != err) {
return OMPI_ERROR;
}
incr *= scount;
for (i = 0, ptmp = (char *) sbuf; i < size; ++i, ptmp += incr) {
err = mca_pml.pml_isend(ptmp, scount, sdtype, i,
MCA_COLL_BASE_TAG_SCATTER,
MCA_PML_BASE_SEND_STANDARD, comm, reqs++);
if (OMPI_SUCCESS != err) {
return err;
}
}
err = ompi_request_wait_all (size, comm->c_coll_basic_data->mccb_reqs,
MPI_STATUSES_IGNORE);
}
return err;
}