235 строки
6.4 KiB
C
235 строки
6.4 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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/*
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* alltoall_intra
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*
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* Function: - MPI_Alltoall
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* Accepts: - same as MPI_Alltoall()
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* Returns: - MPI_SUCCESS or an MPI error code
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*/
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int
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mca_coll_basic_alltoall_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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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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int nreqs;
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char *psnd;
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char *prcv;
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MPI_Aint lb;
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MPI_Aint sndinc;
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MPI_Aint rcvinc;
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ompi_request_t **req;
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ompi_request_t **sreq;
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ompi_request_t **rreq;
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/* Initialize. */
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size = ompi_comm_size(comm);
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rank = ompi_comm_rank(comm);
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err = ompi_ddt_get_extent(sdtype, &lb, &sndinc);
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if (OMPI_SUCCESS != err) {
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return err;
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}
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sndinc *= scount;
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err = ompi_ddt_get_extent(rdtype, &lb, &rcvinc);
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if (OMPI_SUCCESS != err) {
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return err;
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}
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rcvinc *= rcount;
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/* simple optimization */
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psnd = ((char *) sbuf) + (rank * sndinc);
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prcv = ((char *) rbuf) + (rank * rcvinc);
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err = ompi_ddt_sndrcv(psnd, scount, sdtype, prcv, rcount, rdtype);
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if (MPI_SUCCESS != err) {
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return err;
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}
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/* If only one process, we're done. */
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if (1 == size) {
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return MPI_SUCCESS;
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}
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/* Initiate all send/recv to/from others. */
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req = rreq = comm->c_coll_basic_data->mccb_reqs;
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sreq = rreq + size - 1;
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prcv = (char *) rbuf;
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psnd = (char *) sbuf;
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/* Post all receives first -- a simple optimization */
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for (nreqs = 0, i = (rank + 1) % size; i != rank; i = (i + 1) % size, ++rreq, ++nreqs) {
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err =
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MCA_PML_CALL(irecv_init
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(prcv + (i * rcvinc), rcount, rdtype, i,
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MCA_COLL_BASE_TAG_ALLTOALL, comm, rreq));
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if (MPI_SUCCESS != err) {
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mca_coll_basic_free_reqs(req, nreqs);
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return err;
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}
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}
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/* Now post all sends */
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for (nreqs = 0, i = (rank + 1) % size; i != rank; i = (i + 1) % size, ++sreq, ++nreqs) {
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err =
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MCA_PML_CALL(isend_init
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(psnd + (i * sndinc), scount, sdtype, i,
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MCA_COLL_BASE_TAG_ALLTOALL,
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MCA_PML_BASE_SEND_STANDARD, comm, sreq));
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if (MPI_SUCCESS != err) {
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mca_coll_basic_free_reqs(req, nreqs);
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return err;
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}
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}
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nreqs = (size - 1) * 2;
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/* Start your engines. This will never return an error. */
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MCA_PML_CALL(start(nreqs, req));
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/* Wait for them all. If there's an error, note that we don't
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* care what the error was -- just that there *was* an error. The
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* PML will finish all requests, even if one or more of them fail.
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* i.e., by the end of this call, all the requests are free-able.
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* So free them anyway -- even if there was an error, and return
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* the error after we free everything. */
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err = ompi_request_wait_all(nreqs, req, MPI_STATUSES_IGNORE);
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/* Free the reqs */
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mca_coll_basic_free_reqs(req, nreqs);
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/* All done */
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return err;
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}
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/*
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* alltoall_inter
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*
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* Function: - MPI_Alltoall
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* Accepts: - same as MPI_Alltoall()
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* Returns: - MPI_SUCCESS or an MPI error code
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*/
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int
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mca_coll_basic_alltoall_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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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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int nreqs;
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char *psnd;
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char *prcv;
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MPI_Aint lb;
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MPI_Aint sndinc;
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MPI_Aint rcvinc;
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ompi_request_t **req;
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ompi_request_t **sreq;
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ompi_request_t **rreq;
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/* Initialize. */
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size = ompi_comm_remote_size(comm);
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rank = ompi_comm_rank(comm);
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err = ompi_ddt_get_extent(sdtype, &lb, &sndinc);
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if (OMPI_SUCCESS != err) {
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return err;
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}
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sndinc *= scount;
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err = ompi_ddt_get_extent(rdtype, &lb, &rcvinc);
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if (OMPI_SUCCESS != err) {
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return err;
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}
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rcvinc *= rcount;
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/* Initiate all send/recv to/from others. */
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nreqs = size * 2;
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req = rreq = comm->c_coll_basic_data->mccb_reqs;
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sreq = rreq + size;
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prcv = (char *) rbuf;
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psnd = (char *) sbuf;
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/* Post all receives first */
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for (i = 0; i < size; i++, ++rreq) {
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err = MCA_PML_CALL(irecv(prcv + (i * rcvinc), rcount, rdtype, i,
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MCA_COLL_BASE_TAG_ALLTOALL, comm, rreq));
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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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/* Now post all sends */
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for (i = 0; i < size; i++, ++sreq) {
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err = MCA_PML_CALL(isend(psnd + (i * sndinc), scount, sdtype, i,
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MCA_COLL_BASE_TAG_ALLTOALL,
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MCA_PML_BASE_SEND_STANDARD, comm, sreq));
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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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/* Wait for them all. If there's an error, note that we don't
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* care what the error was -- just that there *was* an error. The
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* PML will finish all requests, even if one or more of them fail.
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* i.e., by the end of this call, all the requests are free-able.
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* So free them anyway -- even if there was an error, and return
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* the error after we free everything. */
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err = ompi_request_wait_all(nreqs, req, MPI_STATUSES_IGNORE);
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/* All done */
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return err;
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}
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