104 строки
2.8 KiB
C
104 строки
2.8 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 "coll_hierarch.h"
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#include <stdio.h>
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#include "mpi.h"
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#include "ompi/include/constants.h"
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#include "opal/util/output.h"
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#include "communicator/communicator.h"
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#include "datatype/datatype.h"
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#include "mca/coll/coll.h"
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/*
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* reduce_intra
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*
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* Function: - reduction using two level hierarchy algorithm
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* Accepts: - same as MPI_Reduce()
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* Returns: - MPI_SUCCESS or error code
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*/
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int mca_coll_hierarch_reduce_intra(void *sbuf, void *rbuf, int count,
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struct ompi_datatype_t *dtype,
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struct ompi_op_t *op,
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int root, struct ompi_communicator_t *comm)
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{
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struct mca_coll_base_comm_t *data=NULL;
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struct ompi_communicator_t *llcomm=NULL;
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struct ompi_communicator_t *lcomm=NULL;
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int rank;
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int lroot, llroot;
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long extent, true_extent, lb, true_lb;
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char *tmpbuf=NULL, *tbuf=NULL;
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int ret=OMPI_SUCCESS;
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rank = ompi_comm_rank ( comm );
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data = comm->c_coll_selected_data;
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lcomm = data->hier_lcomm;
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if ( mca_coll_hierarch_verbose_param ) {
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printf("%s:%d: executing hierarchical reduce with cnt=%d and root=%d\n",
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comm->c_name, rank, count, root );
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}
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llcomm = mca_coll_hierarch_get_llcomm ( root, data, &llroot, &lroot);
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if ( MPI_COMM_NULL != lcomm ) {
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ompi_ddt_get_extent(dtype, &lb, &extent);
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ompi_ddt_get_true_extent(dtype, &true_lb, &true_extent);
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tbuf = malloc(true_extent + (count - 1) * extent);
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if (NULL == tbuf) {
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return OMPI_ERR_OUT_OF_RESOURCE;
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}
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tmpbuf = tbuf - lb;
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if ( MPI_IN_PLACE != sbuf ) {
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ret = lcomm->c_coll.coll_reduce (sbuf, tmpbuf, count, dtype,
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op, lroot, lcomm);
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}
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else {
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ret = lcomm->c_coll.coll_reduce (rbuf, tmpbuf, count, dtype,
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op, lroot, lcomm);
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}
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if ( OMPI_SUCCESS != ret ) {
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goto exit;
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}
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}
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if ( MPI_UNDEFINED != llroot ) {
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if ( MPI_COMM_NULL != lcomm ) {
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ret = llcomm->c_coll.coll_reduce (tmpbuf, rbuf, count, dtype,
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op, llroot, llcomm);
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}
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else {
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ret = llcomm->c_coll.coll_reduce (sbuf, rbuf, count, dtype,
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op, llroot, llcomm);
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}
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}
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exit:
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if ( NULL != tmpbuf ) {
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free ( tmpbuf );
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}
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return ret;
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}
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