150 строки
4.3 KiB
C
150 строки
4.3 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) 2004-2005 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) 2006-2010 University of Houston. All rights reserved.
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* Copyright (c) 2015 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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* scatterv_inter
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*
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* Function: - scatterv operation
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* Accepts: - same arguments as MPI_Scatterv()
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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_scatterv_inter(const void *sbuf, const int *scounts,
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const int *disps, struct ompi_datatype_t *sdtype,
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void *rbuf, int rcount,
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struct ompi_datatype_t *rdtype, int root,
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struct ompi_communicator_t *comm,
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mca_coll_base_module_t *module)
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{
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int i, rank, size, err, total, size_local;
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int *counts=NULL,*displace=NULL;
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char *ptmp=NULL;
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MPI_Aint incr;
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MPI_Aint extent;
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MPI_Aint lb;
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ompi_datatype_t *ndtype;
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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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size_local = ompi_comm_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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if(0 == rank) {
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/* local root recieves the counts from the root */
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counts = (int *)malloc(sizeof(int) * size_local);
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err = MCA_PML_CALL(recv(counts, size_local, MPI_INT,
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root, MCA_COLL_BASE_TAG_SCATTERV,
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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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/* calculate the whole buffer size and recieve it from root */
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err = ompi_datatype_get_extent(rdtype, &lb, &extent);
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if (OMPI_SUCCESS != err) {
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return OMPI_ERROR;
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}
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incr = 0;
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for (i = 0; i < size_local; i++) {
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incr = incr + extent*counts[i];
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}
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if ( incr > 0 ) {
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ptmp = (char*)malloc(incr);
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if (NULL == ptmp) {
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return OMPI_ERR_OUT_OF_RESOURCE;
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}
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}
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total = 0;
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for (i = 0; i < size_local; i++) {
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total = total + counts[i];
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}
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err = MCA_PML_CALL(recv(ptmp, total, rdtype,
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root, MCA_COLL_BASE_TAG_SCATTERV,
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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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/* set the local displacement i.e. no displacements here */
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displace = (int *)malloc(sizeof(int) * size_local);
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displace[0] = 0;
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for (i = 1; i < size_local; i++) {
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displace[i] = displace[i-1] + counts[i-1];
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}
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}
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/* perform the scatterv locally */
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err = comm->c_local_comm->c_coll.coll_scatterv(ptmp, counts, displace,
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rdtype, rbuf, rcount,
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rdtype, 0, comm->c_local_comm,
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comm->c_local_comm->c_coll.coll_scatterv_module);
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if (OMPI_SUCCESS != err) {
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return err;
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}
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if (NULL != ptmp) {
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free(ptmp);
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}
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if (NULL != displace) {
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free(displace);
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}
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if (NULL != counts) {
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free(counts);
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}
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} else {
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err = MCA_PML_CALL(send(scounts, size, MPI_INT, 0,
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MCA_COLL_BASE_TAG_SCATTERV,
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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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ompi_datatype_create_indexed(size,scounts,disps,sdtype,&ndtype);
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ompi_datatype_commit(&ndtype);
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err = MCA_PML_CALL(send(sbuf, 1, ndtype, 0,
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MCA_COLL_BASE_TAG_SCATTERV,
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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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ompi_datatype_destroy(&ndtype);
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}
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/* All done */
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return err;
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}
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