100 строки
3.3 KiB
C
100 строки
3.3 KiB
C
/*
|
|
* Copyright (c) 2004-2006 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.
|
|
* $COPYRIGHT$
|
|
*
|
|
* Additional copyrights may follow
|
|
*
|
|
* $HEADER$
|
|
*/
|
|
#include "ompi_config.h"
|
|
#include <stdio.h>
|
|
|
|
#include "ompi/mpi/c/bindings.h"
|
|
#include "ompi/datatype/datatype.h"
|
|
#include "ompi/op/op.h"
|
|
|
|
#if OMPI_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
|
|
#pragma weak MPI_Reduce_scatter = PMPI_Reduce_scatter
|
|
#endif
|
|
|
|
#if OMPI_PROFILING_DEFINES
|
|
#include "ompi/mpi/c/profile/defines.h"
|
|
#endif
|
|
|
|
static const char FUNC_NAME[] = "MPI_Reduce_scatter";
|
|
|
|
|
|
int MPI_Reduce_scatter(void *sendbuf, void *recvbuf, int *recvcounts,
|
|
MPI_Datatype datatype, MPI_Op op, MPI_Comm comm)
|
|
{
|
|
int i, err, size, count;
|
|
|
|
if (MPI_PARAM_CHECK) {
|
|
char *msg;
|
|
err = MPI_SUCCESS;
|
|
OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
|
|
if (ompi_comm_invalid(comm)) {
|
|
return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_COMM,
|
|
FUNC_NAME);
|
|
}
|
|
|
|
/* Unrooted operation; same checks for all ranks on both
|
|
intracommunicators and intercommunicators */
|
|
|
|
else if (MPI_OP_NULL == op) {
|
|
err = MPI_ERR_OP;
|
|
} else if (!ompi_op_is_valid(op, datatype, &msg, FUNC_NAME)) {
|
|
int ret = OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_OP, msg);
|
|
free(msg);
|
|
return ret;
|
|
} else if (NULL == recvcounts) {
|
|
err = MPI_ERR_COUNT;
|
|
} else if (MPI_IN_PLACE == recvbuf) {
|
|
err = MPI_ERR_ARG;
|
|
}
|
|
OMPI_ERRHANDLER_CHECK(err, comm, err, FUNC_NAME);
|
|
|
|
/* We always define the remote group to be the same as the
|
|
local group in the case of an intracommunicator, so it's
|
|
safe to get the size of the remote group here for both
|
|
intra- and intercommunicators */
|
|
|
|
size = ompi_comm_size(comm);
|
|
for (i = 0; i < size; ++i) {
|
|
OMPI_CHECK_DATATYPE_FOR_SEND(err, datatype, recvcounts[i]);
|
|
OMPI_ERRHANDLER_CHECK(err, comm, err, FUNC_NAME);
|
|
}
|
|
}
|
|
|
|
/* MPI-1, p114, says that each process must supply at least one
|
|
element. But at least the Pallas benchmarks call MPI_REDUCE
|
|
with a count of 0. So be sure to handle it. Grrr... */
|
|
|
|
size = ompi_comm_size(comm);
|
|
for (count = i = 0; i < size; ++i) {
|
|
if (0 == recvcounts[i]) {
|
|
++count;
|
|
}
|
|
}
|
|
if (size == count) {
|
|
return MPI_SUCCESS;
|
|
}
|
|
|
|
/* Invoke the coll component to perform the back-end operation */
|
|
|
|
OBJ_RETAIN(op);
|
|
err = comm->c_coll.coll_reduce_scatter(sendbuf, recvbuf, recvcounts,
|
|
datatype, op, comm);
|
|
OBJ_RELEASE(op);
|
|
OMPI_ERRHANDLER_RETURN(err, comm, err, FUNC_NAME);
|
|
}
|