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