163 строки
5.0 KiB
C
163 строки
5.0 KiB
C
/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
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* University Research and Technology
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* Corporation. All rights reserved.
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* Copyright (c) 2004-2005 The University of Tennessee and The University
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* of Tennessee Research Foundation. All rights
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* 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/constants.h"
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#include "ompi/datatype/datatype.h"
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#include "ompi/mca/coll/coll.h"
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#include "ompi/mca/coll/base/coll_tags.h"
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#include "ompi/mca/pml/pml.h"
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#include "coll_basic.h"
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/*
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* scatterv_intra
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*
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* Function: - scatterv operation
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* Accepts: - same arguments as MPI_Scatterv()
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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_scatterv_intra(void *sbuf, int *scounts,
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int *disps, struct ompi_datatype_t *sdtype,
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void *rbuf, int rcount,
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struct ompi_datatype_t *rdtype, int root,
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struct ompi_communicator_t *comm,
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mca_coll_base_module_t *module)
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{
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int i, rank, size, err;
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char *ptmp;
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ptrdiff_t lb, extent;
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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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/* Only receive if there is something to receive */
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if (rcount > 0) {
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return MCA_PML_CALL(recv(rbuf, rcount, rdtype,
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root, MCA_COLL_BASE_TAG_SCATTERV,
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comm, MPI_STATUS_IGNORE));
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}
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return MPI_SUCCESS;
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}
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/* I am the root, loop sending data. */
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err = ompi_ddt_get_extent(sdtype, &lb, &extent);
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if (OMPI_SUCCESS != err) {
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return OMPI_ERROR;
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}
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for (i = 0; i < size; ++i) {
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ptmp = ((char *) sbuf) + (extent * disps[i]);
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/* simple optimization */
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if (i == rank) {
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/* simple optimization or a local operation */
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if (scounts[i] > 0 && MPI_IN_PLACE != rbuf) {
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err = ompi_ddt_sndrcv(ptmp, scounts[i], sdtype, rbuf, rcount,
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rdtype);
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}
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} else {
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/* Only send if there is something to send */
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if (scounts[i] > 0) {
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err = MCA_PML_CALL(send(ptmp, scounts[i], sdtype, i,
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MCA_COLL_BASE_TAG_SCATTERV,
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MCA_PML_BASE_SEND_STANDARD, comm));
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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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}
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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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* scatterv_inter
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*
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* Function: - scatterv operation
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* Accepts: - same arguments as MPI_Scatterv()
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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_scatterv_inter(void *sbuf, int *scounts,
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int *disps, struct ompi_datatype_t *sdtype,
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void *rbuf, int rcount,
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struct ompi_datatype_t *rdtype, int root,
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struct ompi_communicator_t *comm,
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mca_coll_base_module_t *module)
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{
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int i, size, err;
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char *ptmp;
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ptrdiff_t lb, extent;
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mca_coll_basic_module_t *basic_module = (mca_coll_basic_module_t*) module;
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ompi_request_t **reqs = basic_module->mccb_reqs;
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/* Initialize */
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size = ompi_comm_remote_size(comm);
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/* If not root, receive data. Note that we will only get here if
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* rcount > 0 or rank == root. */
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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,
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root, MCA_COLL_BASE_TAG_SCATTERV,
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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(sdtype, &lb, &extent);
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if (OMPI_SUCCESS != err) {
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return OMPI_ERROR;
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}
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for (i = 0; i < size; ++i) {
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ptmp = ((char *) sbuf) + (extent * disps[i]);
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err = MCA_PML_CALL(isend(ptmp, scounts[i], sdtype, i,
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MCA_COLL_BASE_TAG_SCATTERV,
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MCA_PML_BASE_SEND_STANDARD, comm,
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&(reqs[i])));
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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 = ompi_request_wait_all(size, reqs, MPI_STATUSES_IGNORE);
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}
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/* All done */
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return err;
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}
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