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openmpi/ompi/mca/coll/inter/coll_inter_allgather.c
Gilles Gouaillardet 7b8094aac1 coll/base: silence misc warning
as reported by Coverity with CIDs 1363349-1363362

Offset temporary buffer when a non zero lower bound datatype is used.

Thanks Hristo Iliev for the report

(cherry picked from commit 0e393195d9)
2016-07-08 13:06:26 +09:00

117 строки
3.7 KiB
C

/*
* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2006 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) 2006-2010 University of Houston. All rights reserved.
* Copyright (c) 2015-2016 Research Organization for Information Science
* and Technology (RIST). All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include "coll_inter.h"
#include <stdlib.h>
#include "mpi.h"
#include "ompi/constants.h"
#include "ompi/datatype/ompi_datatype.h"
#include "ompi/request/request.h"
#include "ompi/communicator/communicator.h"
#include "ompi/mca/coll/coll.h"
#include "ompi/mca/pml/pml.h"
#include "ompi/mca/coll/base/coll_tags.h"
/*
* allgather_inter
*
* Function: - allgather using other MPI collections
* Accepts: - same as MPI_Allgather()
* Returns: - MPI_SUCCESS or error code
*/
int
mca_coll_inter_allgather_inter(const void *sbuf, int scount,
struct ompi_datatype_t *sdtype,
void *rbuf, int rcount,
struct ompi_datatype_t *rdtype,
struct ompi_communicator_t *comm,
mca_coll_base_module_t *module)
{
int rank, root = 0, size, rsize, err = OMPI_SUCCESS;
char *ptmp_free = NULL, *ptmp = NULL;
ptrdiff_t gap, span;
ompi_request_t *req[2];
rank = ompi_comm_rank(comm);
size = ompi_comm_size(comm->c_local_comm);
rsize = ompi_comm_remote_size(comm);
/* Perform the gather locally at the root */
if ( scount > 0 ) {
span = opal_datatype_span(&sdtype->super, (int64_t)scount*(int64_t)size, &gap);
ptmp_free = (char*)malloc(span);
if (NULL == ptmp_free) {
return OMPI_ERR_OUT_OF_RESOURCE;
}
ptmp = ptmp_free - gap;
err = comm->c_local_comm->c_coll.coll_gather(sbuf, scount, sdtype,
ptmp, scount, sdtype,
0, comm->c_local_comm,
comm->c_local_comm->c_coll.coll_gather_module);
if (OMPI_SUCCESS != err) {
goto exit;
}
}
if (rank == root) {
/* Do a send-recv between the two root procs. to avoid deadlock */
err = MCA_PML_CALL(irecv(rbuf, rcount*rsize, rdtype, 0,
MCA_COLL_BASE_TAG_ALLGATHER, comm,
&(req[0])));
if (OMPI_SUCCESS != err) {
goto exit;
}
err = MCA_PML_CALL(isend(ptmp, scount*size, sdtype, 0,
MCA_COLL_BASE_TAG_ALLGATHER,
MCA_PML_BASE_SEND_STANDARD,
comm, &(req[1])));
if (OMPI_SUCCESS != err) {
goto exit;
}
err = ompi_request_wait_all(2, req, MPI_STATUSES_IGNORE);
if (OMPI_SUCCESS != err) {
goto exit;
}
}
/* bcast the message to all the local processes */
if ( rcount > 0 ) {
err = comm->c_local_comm->c_coll.coll_bcast(rbuf, rcount*rsize, rdtype,
root, comm->c_local_comm,
comm->c_local_comm->c_coll.coll_bcast_module);
if (OMPI_SUCCESS != err) {
goto exit;
}
}
exit:
if (NULL != ptmp_free) {
free(ptmp_free);
}
return err;
}