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openmpi/ompi/mca/coll/basic/coll_basic_alltoallv.c
Jeff Squyres 64c1228b55 Roll back r31519 and r31521: George convinced us that these approaches
weren't right.

This commit was SVN r31528.

The following SVN revision numbers were found above:
  r31519 --> open-mpi/ompi@b449c750b7
  r31521 --> open-mpi/ompi@e243805ed8
2014-04-24 20:27:03 +00:00

328 строки
11 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) 2004-2005 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) 2013 Los Alamos National Security, LLC. All rights
* reserved.
* Copyright (c) 2013 FUJITSU LIMITED. 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_alltoallv_intra_inplace(void *rbuf, const int *rcounts, const int *rdisps,
struct ompi_datatype_t *rdtype,
struct ompi_communicator_t *comm,
mca_coll_base_module_t *module)
{
mca_coll_basic_module_t *basic_module = (mca_coll_basic_module_t*) module;
int i, j, size, rank, err=MPI_SUCCESS;
MPI_Request *preq;
char *tmp_buffer;
size_t max_size;
ptrdiff_t ext;
/* 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 */
ompi_datatype_type_extent (rdtype, &ext);
for (i = 0, max_size = 0 ; i < size ; ++i) {
size_t size = ext * rcounts[i];
max_size = size > max_size ? size : max_size;
}
/* Allocate a temporary buffer */
tmp_buffer = calloc (max_size, 1);
if (NULL == tmp_buffer) {
return OMPI_ERR_OUT_OF_RESOURCE;
}
/* in-place alltoallv slow algorithm (but works) */
for (i = 0 ; i < size ; ++i) {
for (j = i+1 ; j < size ; ++j) {
/* Initiate all send/recv to/from others. */
preq = basic_module->mccb_reqs;
if (i == rank && rcounts[j]) {
/* Copy the data into the temporary buffer */
err = ompi_datatype_copy_content_same_ddt (rdtype, rcounts[j],
tmp_buffer, (char *) rbuf + rdisps[j] * ext);
if (MPI_SUCCESS != err) { goto error_hndl; }
/* Exchange data with the peer */
err = MCA_PML_CALL(irecv ((char *) rbuf + rdisps[j] * ext, rcounts[j], rdtype,
j, MCA_COLL_BASE_TAG_ALLTOALLV, comm, preq++));
if (MPI_SUCCESS != err) { goto error_hndl; }
err = MCA_PML_CALL(isend ((void *) tmp_buffer, rcounts[j], rdtype,
j, MCA_COLL_BASE_TAG_ALLTOALLV, MCA_PML_BASE_SEND_STANDARD,
comm, preq++));
if (MPI_SUCCESS != err) { goto error_hndl; }
} else if (j == rank && rcounts[i]) {
/* Copy the data into the temporary buffer */
err = ompi_datatype_copy_content_same_ddt (rdtype, rcounts[i],
tmp_buffer, (char *) rbuf + rdisps[i] * ext);
if (MPI_SUCCESS != err) { goto error_hndl; }
/* Exchange data with the peer */
err = MCA_PML_CALL(irecv ((char *) rbuf + rdisps[i] * ext, rcounts[i], rdtype,
i, MCA_COLL_BASE_TAG_ALLTOALLV, comm, preq++));
if (MPI_SUCCESS != err) { goto error_hndl; }
err = MCA_PML_CALL(isend ((void *) tmp_buffer, rcounts[i], rdtype,
i, MCA_COLL_BASE_TAG_ALLTOALLV, 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, basic_module->mccb_reqs, MPI_STATUS_IGNORE);
if (MPI_SUCCESS != err) { goto error_hndl; }
/* Free the requests. */
mca_coll_basic_free_reqs(basic_module->mccb_reqs, 2);
}
}
error_hndl:
/* Free the temporary buffer */
free (tmp_buffer);
/* All done */
return err;
}
/*
* alltoallv_intra
*
* Function: - MPI_Alltoallv
* Accepts: - same as MPI_Alltoallv()
* Returns: - MPI_SUCCESS or an MPI error code
*/
int
mca_coll_basic_alltoallv_intra(void *sbuf, int *scounts, int *sdisps,
struct ompi_datatype_t *sdtype,
void *rbuf, int *rcounts, int *rdisps,
struct ompi_datatype_t *rdtype,
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_Aint sndextent;
MPI_Aint rcvextent;
MPI_Request *preq;
mca_coll_basic_module_t *basic_module = (mca_coll_basic_module_t*) module;
/* Initialize. */
if (MPI_IN_PLACE == sbuf) {
return mca_coll_basic_alltoallv_intra_inplace (rbuf, rcounts, rdisps,
rdtype, comm, module);
}
size = ompi_comm_size(comm);
rank = ompi_comm_rank(comm);
ompi_datatype_type_extent(sdtype, &sndextent);
ompi_datatype_type_extent(rdtype, &rcvextent);
/* simple optimization */
psnd = ((char *) sbuf) + (sdisps[rank] * sndextent);
prcv = ((char *) rbuf) + (rdisps[rank] * rcvextent);
if (0 != scounts[rank]) {
err = ompi_datatype_sndrcv(psnd, scounts[rank], sdtype,
prcv, rcounts[rank], rdtype);
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;
preq = basic_module->mccb_reqs;
/* Post all receives first -- a simple optimization */
for (i = 0; i < size; ++i) {
if (i == rank || 0 == rcounts[i]) {
continue;
}
prcv = ((char *) rbuf) + (rdisps[i] * rcvextent);
err = MCA_PML_CALL(irecv_init(prcv, rcounts[i], rdtype,
i, MCA_COLL_BASE_TAG_ALLTOALLV, comm,
preq++));
++nreqs;
if (MPI_SUCCESS != err) {
mca_coll_basic_free_reqs(basic_module->mccb_reqs, nreqs);
return err;
}
}
/* Now post all sends */
for (i = 0; i < size; ++i) {
if (i == rank || 0 == scounts[i]) {
continue;
}
psnd = ((char *) sbuf) + (sdisps[i] * sndextent);
err = MCA_PML_CALL(isend_init(psnd, scounts[i], sdtype,
i, MCA_COLL_BASE_TAG_ALLTOALLV,
MCA_PML_BASE_SEND_STANDARD, comm,
preq++));
++nreqs;
if (MPI_SUCCESS != err) {
mca_coll_basic_free_reqs(basic_module->mccb_reqs, nreqs);
return err;
}
}
/* Start your engines. This will never return an error. */
MCA_PML_CALL(start(nreqs, basic_module->mccb_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, basic_module->mccb_reqs,
MPI_STATUSES_IGNORE);
/* Free the requests. */
mca_coll_basic_free_reqs(basic_module->mccb_reqs, nreqs);
/* All done */
return err;
}
/*
* alltoallv_inter
*
* Function: - MPI_Alltoallv
* Accepts: - same as MPI_Alltoallv()
* Returns: - MPI_SUCCESS or an MPI error code
*/
int
mca_coll_basic_alltoallv_inter(void *sbuf, int *scounts, int *sdisps,
struct ompi_datatype_t *sdtype, void *rbuf,
int *rcounts, int *rdisps,
struct ompi_datatype_t *rdtype,
struct ompi_communicator_t *comm,
mca_coll_base_module_t *module)
{
int i;
int rsize;
int err;
char *psnd;
char *prcv;
size_t nreqs;
MPI_Aint sndextent;
MPI_Aint rcvextent;
mca_coll_basic_module_t *basic_module = (mca_coll_basic_module_t*) module;
ompi_request_t **preq = basic_module->mccb_reqs;
/* Initialize. */
rsize = ompi_comm_remote_size(comm);
ompi_datatype_type_extent(sdtype, &sndextent);
ompi_datatype_type_extent(rdtype, &rcvextent);
/* Initiate all send/recv to/from others. */
nreqs = rsize * 2;
/* Post all receives first */
/* A simple optimization: do not send and recv msgs of length zero */
for (i = 0; i < rsize; ++i) {
prcv = ((char *) rbuf) + (rdisps[i] * rcvextent);
if (rcounts[i] > 0) {
err = MCA_PML_CALL(irecv(prcv, rcounts[i], rdtype,
i, MCA_COLL_BASE_TAG_ALLTOALLV, comm,
&preq[i]));
if (MPI_SUCCESS != err) {
return err;
}
} else {
preq[i] = MPI_REQUEST_NULL;
}
}
/* Now post all sends */
for (i = 0; i < rsize; ++i) {
psnd = ((char *) sbuf) + (sdisps[i] * sndextent);
if (scounts[i] > 0) {
err = MCA_PML_CALL(isend(psnd, scounts[i], sdtype,
i, MCA_COLL_BASE_TAG_ALLTOALLV,
MCA_PML_BASE_SEND_STANDARD, comm,
&preq[rsize + i]));
if (MPI_SUCCESS != err) {
return err;
}
} else {
preq[rsize + i] = MPI_REQUEST_NULL;
}
}
err = ompi_request_wait_all(nreqs, preq, MPI_STATUSES_IGNORE);
/* All done */
return err;
}