23ab9e0277
at the top-level MPI API function. This allows two kinds of scenarios: 1. MPI_Ireduce(..., op, ...); MPI_Op_free(op); MPI_Wait(...); For the non-blocking collectives that we're someday planning -- to make them analogous to non-blocking point-to-point stuff. 2. Thread 1: MPI_Reduce(..., op, ...); Thread 2: MPI_Op_free(op); Granted, for #2 to occur would tread a fine line between a correct and erroneous MPI program, but it is possible (as long as the Op_free was *after* MPI_reduce() had started to execute). It's more realistic with case #1, where the Op_free() could be executed in the same thread or a different thread. This commit was SVN r7870.
97 строки
3.1 KiB
C
97 строки
3.1 KiB
C
/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University.
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* All rights reserved.
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* Copyright (c) 2004-2005 The Trustees of the University of Tennessee.
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* All rights 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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* $COPYRIGHT$
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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 <stdio.h>
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#include "mpi/c/bindings.h"
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#include "ompi/datatype/datatype.h"
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#include "ompi/op/op.h"
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#if OMPI_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
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#pragma weak MPI_Reduce_scatter = PMPI_Reduce_scatter
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#endif
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#if OMPI_PROFILING_DEFINES
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#include "mpi/c/profile/defines.h"
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#endif
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static const char FUNC_NAME[] = "MPI_Reduce_scatter";
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int MPI_Reduce_scatter(void *sendbuf, void *recvbuf, int *recvcounts,
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MPI_Datatype datatype, MPI_Op op, MPI_Comm comm)
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{
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int i, err, size, count;
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if (MPI_PARAM_CHECK) {
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err = MPI_SUCCESS;
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OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
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if (ompi_comm_invalid(comm)) {
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return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_COMM,
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FUNC_NAME);
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}
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/* Unrooted operation; same checks for all ranks on both
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intracommunicators and intercommunicators */
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else if (MPI_OP_NULL == op) {
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err = MPI_ERR_OP;
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} else if (ompi_op_is_intrinsic(op) &&
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datatype->id < DT_MAX_PREDEFINED &&
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-1 == ompi_op_ddt_map[datatype->id]) {
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err = MPI_ERR_OP;
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} else if (NULL == recvcounts) {
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err = MPI_ERR_COUNT;
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} else if (MPI_IN_PLACE == recvbuf) {
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err = MPI_ERR_ARG;
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}
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OMPI_ERRHANDLER_CHECK(err, comm, err, FUNC_NAME);
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/* We always define the remote group to be the same as the
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local group in the case of an intracommunicator, so it's
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safe to get the size of the remote group here for both
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intra- and intercommunicators */
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size = ompi_comm_size(comm);
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for (i = 0; i < size; ++i) {
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OMPI_CHECK_DATATYPE_FOR_SEND(err, datatype, recvcounts[i]);
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OMPI_ERRHANDLER_CHECK(err, comm, err, FUNC_NAME);
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}
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}
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/* MPI-1, p114, says that each process must supply at least one
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element. But at least the Pallas benchmarks call MPI_REDUCE
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with a count of 0. So be sure to handle it. Grrr... */
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size = ompi_comm_size(comm);
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for (count = i = 0; i < size; ++i) {
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if (0 == recvcounts[i]) {
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++count;
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}
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}
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if (size == count) {
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return MPI_SUCCESS;
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}
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/* Invoke the coll component to perform the back-end operation */
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OBJ_RETAIN(op);
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err = comm->c_coll.coll_reduce_scatter(sendbuf, recvbuf, recvcounts,
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datatype, op, comm);
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OBJ_RELEASE(op);
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OMPI_ERRHANDLER_RETURN(err, comm, err, FUNC_NAME);
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}
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