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openmpi/ompi/mca/coll/basic/coll_basic_alltoallw.c
George Bosilca 4d00c59b2e Cleanup the memory handling for temporary buffers in
some of the collective modules. Added a new function
opan_datatype_span, to compute the memory span of
count number of datatype, excluding the gaps in the
beginning and at the end. If a memory allocation is
made using the returned value, the gap (also returned)
should be removed from the allocated pointer.
2015-12-02 20:42:18 -05:00

348 строки
12 KiB
C

/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
/*
* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2015 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* Copyright (c) 2004-2005 The Regents of the University of California.
* All rights reserved.
* Copyright (c) 2012 Oak Ridge National Labs. All rights reserved.
* Copyright (c) 2013 Los Alamos National Security, LLC. All rights
* reserved.
* Copyright (c) 2013 FUJITSU LIMITED. All rights reserved.
* Copyright (c) 2014-2015 Research Organization for Information Science
* and Technology (RIST). All rights reserved.
* Copyright (c) 2014 Cisco Systems, Inc. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include "coll_basic.h"
#include "mpi.h"
#include "ompi/constants.h"
#include "ompi/datatype/ompi_datatype.h"
#include "ompi/mca/coll/coll.h"
#include "ompi/mca/coll/base/coll_tags.h"
#include "ompi/mca/pml/pml.h"
static int
mca_coll_basic_alltoallw_intra_inplace(const void *rbuf, const int *rcounts, const int *rdisps,
struct ompi_datatype_t * const *rdtypes,
struct ompi_communicator_t *comm,
mca_coll_base_module_t *module)
{
int i, j, size, rank, err = MPI_SUCCESS, max_size;
MPI_Request *preq, *reqs = NULL;
char *tmp_buffer, *save_buffer = NULL;
ptrdiff_t ext, gap;
/* Initialize. */
size = ompi_comm_size(comm);
rank = ompi_comm_rank(comm);
/* If only one process, we're done. */
if (1 == size) {
return MPI_SUCCESS;
}
/* Find the largest receive amount */
for (i = 0, max_size = 0 ; i < size ; ++i) {
ext = opal_datatype_span(&rdtypes[i]->super, rcounts[i], &gap);
max_size = ext > max_size ? ext : max_size;
}
/* Allocate a temporary buffer */
tmp_buffer = save_buffer = calloc (max_size, 1);
if (NULL == tmp_buffer) {
return OMPI_ERR_OUT_OF_RESOURCE;
}
tmp_buffer -= gap;
reqs = coll_base_comm_get_reqs( module->base_data, 2);
/* in-place alltoallw slow algorithm (but works) */
for (i = 0 ; i < size ; ++i) {
size_t msg_size_i;
ompi_datatype_type_size(rdtypes[i], &msg_size_i);
msg_size_i *= rcounts[i];
for (j = i+1 ; j < size ; ++j) {
size_t msg_size_j;
ompi_datatype_type_size(rdtypes[j], &msg_size_j);
msg_size_j *= rcounts[j];
/* Initiate all send/recv to/from others. */
preq = reqs;
if (i == rank && msg_size_j != 0) {
/* Copy the data into the temporary buffer */
err = ompi_datatype_copy_content_same_ddt (rdtypes[j], rcounts[j],
tmp_buffer, (char *) rbuf + rdisps[j]);
if (MPI_SUCCESS != err) { goto error_hndl; }
/* Exchange data with the peer */
err = MCA_PML_CALL(irecv ((char *) rbuf + rdisps[j], rcounts[j], rdtypes[j],
j, MCA_COLL_BASE_TAG_ALLTOALLW, comm, preq++));
if (MPI_SUCCESS != err) { goto error_hndl; }
err = MCA_PML_CALL(isend ((void *) tmp_buffer, rcounts[j], rdtypes[j],
j, MCA_COLL_BASE_TAG_ALLTOALLW, MCA_PML_BASE_SEND_STANDARD,
comm, preq++));
if (MPI_SUCCESS != err) { goto error_hndl; }
} else if (j == rank && msg_size_i != 0) {
/* Copy the data into the temporary buffer */
err = ompi_datatype_copy_content_same_ddt (rdtypes[i], rcounts[i],
tmp_buffer, (char *) rbuf + rdisps[i]);
if (MPI_SUCCESS != err) { goto error_hndl; }
/* Exchange data with the peer */
err = MCA_PML_CALL(irecv ((char *) rbuf + rdisps[i], rcounts[i], rdtypes[i],
i, MCA_COLL_BASE_TAG_ALLTOALLW, comm, preq++));
if (MPI_SUCCESS != err) { goto error_hndl; }
err = MCA_PML_CALL(isend ((void *) tmp_buffer, rcounts[i], rdtypes[i],
i, MCA_COLL_BASE_TAG_ALLTOALLW, MCA_PML_BASE_SEND_STANDARD,
comm, preq++));
if (MPI_SUCCESS != err) { goto error_hndl; }
} else {
continue;
}
/* Wait for the requests to complete */
err = ompi_request_wait_all (2, reqs, MPI_STATUSES_IGNORE);
if (MPI_SUCCESS != err) { goto error_hndl; }
}
}
error_hndl:
/* Free the temporary buffer */
free (save_buffer);
if( MPI_SUCCESS != err ) { /* Free the requests. */
if( NULL != reqs ) {
ompi_coll_base_free_reqs(reqs, 2);
}
}
/* All done */
return err;
}
/*
* alltoallw_intra
*
* Function: - MPI_Alltoallw
* Accepts: - same as MPI_Alltoallw()
* Returns: - MPI_SUCCESS or an MPI error code
*/
int
mca_coll_basic_alltoallw_intra(const void *sbuf, const int *scounts, const int *sdisps,
struct ompi_datatype_t * const *sdtypes,
void *rbuf, const int *rcounts, const int *rdisps,
struct ompi_datatype_t * const *rdtypes,
struct ompi_communicator_t *comm,
mca_coll_base_module_t *module)
{
int i;
int size;
int rank;
int err;
char *psnd;
char *prcv;
int nreqs;
MPI_Request *preq, *reqs;
/* Initialize. */
if (MPI_IN_PLACE == sbuf) {
return mca_coll_basic_alltoallw_intra_inplace (rbuf, rcounts, rdisps,
rdtypes, comm, module);
}
size = ompi_comm_size(comm);
rank = ompi_comm_rank(comm);
/* simple optimization */
psnd = ((char *) sbuf) + sdisps[rank];
prcv = ((char *) rbuf) + rdisps[rank];
err = ompi_datatype_sndrcv(psnd, scounts[rank], sdtypes[rank],
prcv, rcounts[rank], rdtypes[rank]);
if (MPI_SUCCESS != err) {
return err;
}
/* If only one process, we're done. */
if (1 == size) {
return MPI_SUCCESS;
}
/* Initiate all send/recv to/from others. */
nreqs = 0;
reqs = preq = coll_base_comm_get_reqs(module->base_data, 2 * size);
/* Post all receives first -- a simple optimization */
for (i = 0; i < size; ++i) {
size_t msg_size;
ompi_datatype_type_size(rdtypes[i], &msg_size);
msg_size *= rcounts[i];
if (i == rank || 0 == msg_size)
continue;
prcv = ((char *) rbuf) + rdisps[i];
err = MCA_PML_CALL(irecv_init(prcv, rcounts[i], rdtypes[i],
i, MCA_COLL_BASE_TAG_ALLTOALLW, comm,
preq++));
++nreqs;
if (MPI_SUCCESS != err) {
ompi_coll_base_free_reqs(reqs, nreqs);
return err;
}
}
/* Now post all sends */
for (i = 0; i < size; ++i) {
size_t msg_size;
ompi_datatype_type_size(sdtypes[i], &msg_size);
msg_size *= scounts[i];
if (i == rank || 0 == msg_size)
continue;
psnd = ((char *) sbuf) + sdisps[i];
err = MCA_PML_CALL(isend_init(psnd, scounts[i], sdtypes[i],
i, MCA_COLL_BASE_TAG_ALLTOALLW,
MCA_PML_BASE_SEND_STANDARD, comm,
preq++));
++nreqs;
if (MPI_SUCCESS != err) {
ompi_coll_base_free_reqs(reqs, nreqs);
return err;
}
}
/* Start your engines. This will never return an error. */
MCA_PML_CALL(start(nreqs, reqs));
/* Wait for them all. If there's an error, note that we don't care
* what the error was -- just that there *was* an error. The PML
* will finish all requests, even if one or more of them fail.
* i.e., by the end of this call, all the requests are free-able.
* So free them anyway -- even if there was an error, and return the
* error after we free everything. */
err = ompi_request_wait_all(nreqs, reqs, MPI_STATUSES_IGNORE);
/* Free the requests in all cases as they are persistent */
ompi_coll_base_free_reqs(reqs, nreqs);
/* All done */
return err;
}
/*
* alltoallw_inter
*
* Function: - MPI_Alltoallw
* Accepts: - same as MPI_Alltoallw()
* Returns: - MPI_SUCCESS or an MPI error code
*/
int
mca_coll_basic_alltoallw_inter(const void *sbuf, const int *scounts, const int *sdisps,
struct ompi_datatype_t * const *sdtypes,
void *rbuf, const int *rcounts, const int *rdisps,
struct ompi_datatype_t * const *rdtypes,
struct ompi_communicator_t *comm,
mca_coll_base_module_t *module)
{
int i;
int size;
int err;
char *psnd;
char *prcv;
int nreqs;
MPI_Request *preq, *reqs;
/* Initialize. */
size = ompi_comm_remote_size(comm);
/* Initiate all send/recv to/from others. */
nreqs = 0;
reqs = preq = coll_base_comm_get_reqs(module->base_data, 2 * size);
/* Post all receives first -- a simple optimization */
for (i = 0; i < size; ++i) {
size_t msg_size;
ompi_datatype_type_size(rdtypes[i], &msg_size);
msg_size *= rcounts[i];
if (0 == msg_size)
continue;
prcv = ((char *) rbuf) + rdisps[i];
err = MCA_PML_CALL(irecv_init(prcv, rcounts[i], rdtypes[i],
i, MCA_COLL_BASE_TAG_ALLTOALLW,
comm, preq++));
++nreqs;
if (OMPI_SUCCESS != err) {
ompi_coll_base_free_reqs(reqs, nreqs);
return err;
}
}
/* Now post all sends */
for (i = 0; i < size; ++i) {
size_t msg_size;
ompi_datatype_type_size(sdtypes[i], &msg_size);
msg_size *= scounts[i];
if (0 == msg_size)
continue;
psnd = ((char *) sbuf) + sdisps[i];
err = MCA_PML_CALL(isend_init(psnd, scounts[i], sdtypes[i],
i, MCA_COLL_BASE_TAG_ALLTOALLW,
MCA_PML_BASE_SEND_STANDARD, comm,
preq++));
++nreqs;
if (OMPI_SUCCESS != err) {
ompi_coll_base_free_reqs(reqs, nreqs);
return err;
}
}
/* Start your engines. This will never return an error. */
MCA_PML_CALL(start(nreqs, reqs));
/* Wait for them all. If there's an error, note that we don't care
* what the error was -- just that there *was* an error. The PML
* will finish all requests, even if one or more of them fail.
* i.e., by the end of this call, all the requests are free-able.
* So free them anyway -- even if there was an error, and return the
* error after we free everything. */
err = ompi_request_wait_all(nreqs, reqs, MPI_STATUSES_IGNORE);
/* Free the requests in all cases as they are persistent */
ompi_coll_base_free_reqs(reqs, nreqs);
/* All done */
return err;
}