157 строки
4.9 KiB
C
157 строки
4.9 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 "coll_basic.h"
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/*
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* gatherv_intra
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*
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* Function: - basic gatherv operation
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* Accepts: - same arguments as MPI_Gatherv()
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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_gatherv_intra(void *sbuf, int scount,
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struct ompi_datatype_t *sdtype,
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void *rbuf, int *rcounts, int *disps,
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struct ompi_datatype_t *rdtype, int root,
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struct ompi_communicator_t *comm)
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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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size = ompi_comm_size(comm);
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rank = ompi_comm_rank(comm);
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/* Everyone but root sends data and returns. Don't send anything
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for sendcounts of 0 (even though MPI_Gatherv has a guard for 0
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counts, this routine is used elsewhere, like the implementation
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of allgatherv, so it's possible to get here with a scount of
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0) */
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if (rank != root) {
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if (scount > 0) {
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return MCA_PML_CALL(send(sbuf, scount, sdtype, root,
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MCA_COLL_BASE_TAG_GATHERV,
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MCA_PML_BASE_SEND_STANDARD, comm));
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}
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return MPI_SUCCESS;
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}
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/* I am the root, loop receiving data. */
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err = ompi_ddt_get_extent(rdtype, &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 *) rbuf) + (extent * disps[i]);
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if (i == rank) {
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/* simple optimization */
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if (MPI_IN_PLACE != sbuf && (0 < scount) && (0 < rcounts[i])) {
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err = ompi_ddt_sndrcv(sbuf, scount, sdtype,
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ptmp, rcounts[i], rdtype);
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}
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} else {
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/* Only receive if there is something to receive */
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if (rcounts[i] > 0) {
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err = MCA_PML_CALL(recv(ptmp, rcounts[i], rdtype, i,
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MCA_COLL_BASE_TAG_GATHERV,
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comm, MPI_STATUS_IGNORE));
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}
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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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* gatherv_inter
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*
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* Function: - basic gatherv operation
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* Accepts: - same arguments as MPI_Gatherv()
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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_gatherv_inter(void *sbuf, int scount,
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struct ompi_datatype_t *sdtype,
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void *rbuf, int *rcounts, int *disps,
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struct ompi_datatype_t *rdtype, int root,
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struct ompi_communicator_t *comm)
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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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ompi_request_t **reqs = comm->c_coll_basic_data->mccb_reqs;
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size = ompi_comm_remote_size(comm);
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rank = ompi_comm_rank(comm);
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/* If not root, receive data. Note that we will only get here if
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* scount > 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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/* Everyone but root sends data and returns. */
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err = MCA_PML_CALL(send(sbuf, scount, sdtype, root,
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MCA_COLL_BASE_TAG_GATHERV,
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MCA_PML_BASE_SEND_STANDARD, comm));
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} else {
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/* I am the root, loop receiving data. */
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err = ompi_ddt_get_extent(rdtype, &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 *) rbuf) + (extent * disps[i]);
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err = MCA_PML_CALL(irecv(ptmp, rcounts[i], rdtype, i,
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MCA_COLL_BASE_TAG_GATHERV,
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comm, &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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