366d64b7e5
As we changed the ABI (forcing a major release), we can limit the size of the predefined communicators by moving the collective structure outside the communicator. This might have a minimal, but unnoticeable, impact on performance. This approach has been discussed during the January 2017 devel meeting. Signed-off-by: George Bosilca <bosilca@icl.utk.edu> Signed-off-by: Joshua Hursey <jhursey@us.ibm.com>
99 строки
3.2 KiB
C
99 строки
3.2 KiB
C
/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
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* University Research and Technology
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* Corporation. All rights reserved.
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* Copyright (c) 2004-2017 The University of Tennessee and The University
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* of Tennessee Research Foundation. All rights
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* 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 (c) 2006-2008 University of Houston. All rights reserved.
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* Copyright (c) 2015-2016 Research Organization for Information Science
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* and Technology (RIST). 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_inter.h"
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#include "mpi.h"
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#include "ompi/constants.h"
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#include "ompi/datatype/ompi_datatype.h"
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#include "ompi/mca/coll/coll.h"
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#include "ompi/mca/coll/base/coll_tags.h"
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#include "ompi/mca/pml/pml.h"
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/*
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* scatter_inter
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*
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* Function: - scatter operation
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* Accepts: - same arguments as MPI_Scatter()
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* Returns: - MPI_SUCCESS or error code
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*/
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int
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mca_coll_inter_scatter_inter(const void *sbuf, int scount,
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struct ompi_datatype_t *sdtype,
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void *rbuf, int rcount,
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struct ompi_datatype_t *rdtype,
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int root, struct ompi_communicator_t *comm,
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mca_coll_base_module_t *module)
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{
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int rank, size, err;
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/* Initialize */
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rank = ompi_comm_rank(comm);
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size = ompi_comm_remote_size(comm);
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if (MPI_PROC_NULL == root) {
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/* do nothing */
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err = OMPI_SUCCESS;
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} else if (MPI_ROOT != root) {
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/* First process receives the data from root */
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char *ptmp_free = NULL, *ptmp = NULL;
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if(0 == rank) {
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int size_local;
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ptrdiff_t gap, span;
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size_local = ompi_comm_size(comm->c_local_comm);
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span = opal_datatype_span(&rdtype->super, (int64_t)rcount*(int64_t)size_local, &gap);
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ptmp_free = malloc(span);
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if (NULL == ptmp_free) {
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return OMPI_ERR_OUT_OF_RESOURCE;
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}
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ptmp = ptmp_free - gap;
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err = MCA_PML_CALL(recv(ptmp, rcount*size_local, rdtype,
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root, MCA_COLL_BASE_TAG_SCATTER,
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comm, MPI_STATUS_IGNORE));
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if (OMPI_SUCCESS != err) {
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return err;
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}
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}
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/* Perform the scatter locally with the first process as root */
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err = comm->c_local_comm->c_coll->coll_scatter(ptmp, rcount, rdtype,
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rbuf, rcount, rdtype,
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0, comm->c_local_comm,
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comm->c_local_comm->c_coll->coll_scatter_module);
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if (NULL != ptmp_free) {
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free(ptmp_free);
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}
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} else {
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/* Root sends data to the first process in the remote group */
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err = MCA_PML_CALL(send(sbuf, scount*size, sdtype, 0,
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MCA_COLL_BASE_TAG_SCATTER,
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MCA_PML_BASE_SEND_STANDARD, comm));
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if (OMPI_SUCCESS != err) {
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return err;
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}
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}
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return err;
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}
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