baf532087a
Avoid sending/receiving zero size messages in order to be compliant with the top-level modification cmr=v1.8.2:ticket=4651:reviewer=bosilca This commit was SVN r31836. The following Trac tickets were found above: Ticket 4651 --> https://svn.open-mpi.org/trac/ompi/ticket/4651
357 строки
12 KiB
C
357 строки
12 KiB
C
/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
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/*
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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 (c) 2012 Oak Ridge National Labs. All rights reserved.
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* Copyright (c) 2013 Los Alamos National Security, LLC. All rights
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* reserved.
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* Copyright (c) 2013 FUJITSU LIMITED. All rights reserved.
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* Copyright (c) 2014 Research Organization for Information Science
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* and Technology (RIST). All rights reserved.
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* Copyright (c) 2014 Cisco Systems, Inc. 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/ompi_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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static int
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mca_coll_basic_alltoallw_intra_inplace(void *rbuf, int *rcounts, const int *rdisps,
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struct ompi_datatype_t * const *rdtypes,
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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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mca_coll_basic_module_t *basic_module = (mca_coll_basic_module_t*) module;
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int i, j, size, rank, err=MPI_SUCCESS, max_size;
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MPI_Request *preq;
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char *tmp_buffer;
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ptrdiff_t ext;
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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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/* 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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/* Find the largest receive amount */
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for (i = 0, max_size = 0 ; i < size ; ++i) {
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ompi_datatype_type_extent (rdtypes[i], &ext);
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ext *= rcounts[i];
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max_size = ext > max_size ? ext : max_size;
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}
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/* Allocate a temporary buffer */
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tmp_buffer = calloc (max_size, 1);
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if (NULL == tmp_buffer) {
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return OMPI_ERR_OUT_OF_RESOURCE;
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}
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/* in-place alltoallw slow algorithm (but works) */
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for (i = 0 ; i < size ; ++i) {
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size_t msg_size_i;
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ompi_datatype_type_size(rdtypes[i], &msg_size_i);
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msg_size_i *= rcounts[i];
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for (j = i+1 ; j < size ; ++j) {
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size_t msg_size_j;
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ompi_datatype_type_size(rdtypes[j], &msg_size_j);
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msg_size_j *= rcounts[j];
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/* Initiate all send/recv to/from others. */
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preq = basic_module->mccb_reqs;
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if (i == rank && msg_size_j != 0) {
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/* Copy the data into the temporary buffer */
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err = ompi_datatype_copy_content_same_ddt (rdtypes[j], rcounts[j],
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tmp_buffer, (char *) rbuf + rdisps[j]);
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if (MPI_SUCCESS != err) { goto error_hndl; }
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/* Exchange data with the peer */
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err = MCA_PML_CALL(irecv ((char *) rbuf + rdisps[j], rcounts[j], rdtypes[j],
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j, MCA_COLL_BASE_TAG_ALLTOALLW, comm, preq++));
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if (MPI_SUCCESS != err) { goto error_hndl; }
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err = MCA_PML_CALL(isend ((void *) tmp_buffer, rcounts[j], rdtypes[j],
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j, MCA_COLL_BASE_TAG_ALLTOALLW, MCA_PML_BASE_SEND_STANDARD,
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comm, preq++));
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if (MPI_SUCCESS != err) { goto error_hndl; }
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} else if (j == rank && msg_size_i != 0) {
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/* Copy the data into the temporary buffer */
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err = ompi_datatype_copy_content_same_ddt (rdtypes[i], rcounts[i],
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tmp_buffer, (char *) rbuf + rdisps[i]);
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if (MPI_SUCCESS != err) { goto error_hndl; }
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/* Exchange data with the peer */
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err = MCA_PML_CALL(irecv ((char *) rbuf + rdisps[i], rcounts[i], rdtypes[i],
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i, MCA_COLL_BASE_TAG_ALLTOALLW, comm, preq++));
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if (MPI_SUCCESS != err) { goto error_hndl; }
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err = MCA_PML_CALL(isend ((void *) tmp_buffer, rcounts[i], rdtypes[i],
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i, MCA_COLL_BASE_TAG_ALLTOALLW, MCA_PML_BASE_SEND_STANDARD,
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comm, preq++));
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if (MPI_SUCCESS != err) { goto error_hndl; }
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} else {
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continue;
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}
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/* Wait for the requests to complete */
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err = ompi_request_wait_all (2, basic_module->mccb_reqs, MPI_STATUSES_IGNORE);
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if (MPI_SUCCESS != err) { goto error_hndl; }
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/* Free the requests. */
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mca_coll_basic_free_reqs(basic_module->mccb_reqs, 2);
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}
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}
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error_hndl:
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/* Free the temporary buffer */
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free (tmp_buffer);
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/* All done */
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return err;
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}
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/*
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* alltoallw_intra
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*
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* Function: - MPI_Alltoallw
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* Accepts: - same as MPI_Alltoallw()
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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_alltoallw_intra(void *sbuf, int *scounts, int *sdisps,
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struct ompi_datatype_t **sdtypes,
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void *rbuf, int *rcounts, int *rdisps,
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struct ompi_datatype_t **rdtypes,
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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;
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int size;
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int rank;
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int err;
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char *psnd;
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char *prcv;
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int nreqs;
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MPI_Request *preq;
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mca_coll_basic_module_t *basic_module = (mca_coll_basic_module_t*) module;
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/* Initialize. */
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if (MPI_IN_PLACE == sbuf) {
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return mca_coll_basic_alltoallw_intra_inplace (rbuf, rcounts, rdisps,
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rdtypes, comm, module);
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}
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size = ompi_comm_size(comm);
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rank = ompi_comm_rank(comm);
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/* simple optimization */
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psnd = ((char *) sbuf) + sdisps[rank];
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prcv = ((char *) rbuf) + rdisps[rank];
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err = ompi_datatype_sndrcv(psnd, scounts[rank], sdtypes[rank],
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prcv, rcounts[rank], rdtypes[rank]);
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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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nreqs = 0;
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preq = basic_module->mccb_reqs;
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/* Post all receives first -- a simple optimization */
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for (i = 0; i < size; ++i) {
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size_t msg_size;
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ompi_datatype_type_size(rdtypes[i], &msg_size);
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msg_size *= rcounts[i];
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if (i == rank || 0 == msg_size)
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continue;
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prcv = ((char *) rbuf) + rdisps[i];
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err = MCA_PML_CALL(irecv_init(prcv, rcounts[i], rdtypes[i],
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i, MCA_COLL_BASE_TAG_ALLTOALLW, comm,
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preq++));
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++nreqs;
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if (MPI_SUCCESS != err) {
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mca_coll_basic_free_reqs(basic_module->mccb_reqs,
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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 (i = 0; i < size; ++i) {
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size_t msg_size;
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ompi_datatype_type_size(sdtypes[i], &msg_size);
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msg_size *= scounts[i];
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if (i == rank || 0 == msg_size)
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continue;
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psnd = ((char *) sbuf) + sdisps[i];
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err = MCA_PML_CALL(isend_init(psnd, scounts[i], sdtypes[i],
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i, MCA_COLL_BASE_TAG_ALLTOALLW,
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MCA_PML_BASE_SEND_STANDARD, comm,
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preq++));
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++nreqs;
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if (MPI_SUCCESS != err) {
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mca_coll_basic_free_reqs(basic_module->mccb_reqs,
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nreqs);
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return err;
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}
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}
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/* Start your engines. This will never return an error. */
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MCA_PML_CALL(start(nreqs, basic_module->mccb_reqs));
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/* Wait for them all. If there's an error, note that we don't care
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* what the error was -- just that there *was* an error. The PML
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* 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 the
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* error after we free everything. */
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err = ompi_request_wait_all(nreqs, basic_module->mccb_reqs,
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MPI_STATUSES_IGNORE);
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/* Free the requests. */
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mca_coll_basic_free_reqs(basic_module->mccb_reqs, 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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* alltoallw_inter
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*
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* Function: - MPI_Alltoallw
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* Accepts: - same as MPI_Alltoallw()
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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_alltoallw_inter(void *sbuf, int *scounts, int *sdisps,
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struct ompi_datatype_t **sdtypes,
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void *rbuf, int *rcounts, int *rdisps,
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struct ompi_datatype_t **rdtypes,
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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;
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int size;
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int err;
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char *psnd;
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char *prcv;
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int nreqs;
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MPI_Request *preq;
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mca_coll_basic_module_t *basic_module = (mca_coll_basic_module_t*) module;
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/* Initialize. */
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size = ompi_comm_remote_size(comm);
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/* Initiate all send/recv to/from others. */
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nreqs = 0;
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preq = basic_module->mccb_reqs;
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/* Post all receives first -- a simple optimization */
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for (i = 0; i < size; ++i) {
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size_t msg_size;
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ompi_datatype_type_size(rdtypes[i], &msg_size);
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msg_size *= rcounts[i];
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if (0 == msg_size)
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continue;
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prcv = ((char *) rbuf) + rdisps[i];
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err = MCA_PML_CALL(irecv_init(prcv, rcounts[i], rdtypes[i],
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i, MCA_COLL_BASE_TAG_ALLTOALLW,
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comm, preq++));
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++nreqs;
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if (OMPI_SUCCESS != err) {
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mca_coll_basic_free_reqs(basic_module->mccb_reqs,
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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 (i = 0; i < size; ++i) {
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size_t msg_size;
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ompi_datatype_type_size(sdtypes[i], &msg_size);
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msg_size *= scounts[i];
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if (0 == msg_size)
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continue;
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psnd = ((char *) sbuf) + sdisps[i];
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err = MCA_PML_CALL(isend_init(psnd, scounts[i], sdtypes[i],
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i, MCA_COLL_BASE_TAG_ALLTOALLW,
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MCA_PML_BASE_SEND_STANDARD, comm,
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preq++));
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++nreqs;
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if (OMPI_SUCCESS != err) {
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mca_coll_basic_free_reqs(basic_module->mccb_reqs,
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nreqs);
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return err;
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}
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}
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/* Start your engines. This will never return an error. */
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MCA_PML_CALL(start(nreqs, basic_module->mccb_reqs));
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/* Wait for them all. If there's an error, note that we don't care
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* what the error was -- just that there *was* an error. The PML
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* 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 the
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* error after we free everything. */
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err = ompi_request_wait_all(nreqs, basic_module->mccb_reqs,
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MPI_STATUSES_IGNORE);
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/* Free the requests. */
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mca_coll_basic_free_reqs(basic_module->mccb_reqs, nreqs);
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/* All done */
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return err;
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}
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