144 строки
4.8 KiB
C
144 строки
4.8 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) 2004-2014 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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* gatherv_inter
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*
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* Function: - gatherv operation using a local gather on c_local_comm
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* Accepts: - same arguments as MPI_Gatherv()
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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_gatherv_inter(const void *sbuf, int scount,
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struct ompi_datatype_t *sdtype,
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void *rbuf, const int *rcounts, const int *disps,
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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, size_local, total=0, err;
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int *count=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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if (MPI_PROC_NULL == root) { /* do nothing */
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return OMPI_SUCCESS;
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}
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size = ompi_comm_remote_size(comm);
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rank = ompi_comm_rank(comm);
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size_local = ompi_comm_size(comm);
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if (MPI_ROOT == root) { /* I am the root, receiving the data from zero. */
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ompi_datatype_create_indexed(size, rcounts, disps, rdtype, &ndtype);
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ompi_datatype_commit(&ndtype);
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err = MCA_PML_CALL(recv(rbuf, 1, ndtype, 0,
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MCA_COLL_BASE_TAG_GATHERV,
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comm, MPI_STATUS_IGNORE));
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ompi_datatype_destroy(&ndtype);
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return err;
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}
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if (0 == rank) {
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count = (int *)malloc(sizeof(int) * size_local);
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displace = (int *)malloc(sizeof(int) * size_local);
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if ((NULL == displace) || (NULL == count)) {
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err = OMPI_ERR_OUT_OF_RESOURCE;
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goto exit;
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}
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}
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err = comm->c_local_comm->c_coll.coll_gather(&scount, 1, MPI_INT,
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count, 1, MPI_INT,
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0, comm->c_local_comm,
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comm->c_local_comm->c_coll.coll_gather_module);
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if (OMPI_SUCCESS != err) {
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goto exit;
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}
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if(0 == rank) {
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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] + count[i-1];
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}
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/* Perform the gatherv locally with the first process as root */
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err = ompi_datatype_get_extent(sdtype, &lb, &extent);
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if (OMPI_SUCCESS != err) {
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err = OMPI_ERROR;
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goto exit;
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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*count[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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err = OMPI_ERR_OUT_OF_RESOURCE;
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goto exit;
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}
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}
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}
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err = comm->c_local_comm->c_coll.coll_gatherv(sbuf, scount, sdtype,
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ptmp, count, displace,
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sdtype,0, comm->c_local_comm,
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comm->c_local_comm->c_coll.coll_gatherv_module);
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if (OMPI_SUCCESS != err) {
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goto exit;
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}
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if (0 == rank) {
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for (i = 0; i < size_local; i++) {
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total = total + count[i];
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}
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/* First process sends data to the root */
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err = MCA_PML_CALL(send(ptmp, total, sdtype, root,
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MCA_COLL_BASE_TAG_GATHERV,
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MCA_PML_BASE_SEND_STANDARD, comm));
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}
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exit:
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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 != count) {
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free(count);
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}
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/* All done */
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return err;
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}
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