+++ /dev/null
-/* Copyright (c) 2013-2014. The SimGrid Team.
- * All rights reserved. */
-
-/* This program is free software; you can redistribute it and/or modify it
- * under the terms of the license (GNU LGPL) which comes with this package. */
-
-#include "colls_private.h"
-/*
- * Linear functions are copied from the basic coll module. For
- * some small number of nodes and/or small data sizes they are just as
- * fast as tuned/tree based segmenting operations and as such may be
- * selected by the decision functions. These are copied into this module
- * due to the way we select modules in V1. i.e. in V2 we will handle this
- * differently and so will not have to duplicate code.
- * GEF Oct05 after asking Jeff.
- */
-int
-smpi_coll_tuned_alltoallv_ompi_basic_linear(void *sbuf, int *scounts, int *sdisps,
- MPI_Datatype sdtype,
- void *rbuf, int *rcounts, int *rdisps,
- MPI_Datatype rdtype,
- MPI_Comm comm)
-{
- int i, size, rank;
- char *psnd, *prcv;
- int nreqs;
- ptrdiff_t sext, rext;
- MPI_Request *preq;
- size = comm->size();
- rank = comm->rank();
- MPI_Request *ireqs= static_cast<MPI_Request*>(xbt_malloc(sizeof(MPI_Request) * size * 2));
- XBT_DEBUG(
- "coll:tuned:alltoallv_intra_basic_linear rank %d", rank);
-
- sext=sdtype->get_extent();
- rext=rdtype->get_extent();
-
- /* Simple optimization - handle send to self first */
- psnd = ((char *) sbuf) + (sdisps[rank] * sext);
- prcv = ((char *) rbuf) + (rdisps[rank] * rext);
- if (0 != scounts[rank]) {
- Datatype::copy(psnd, scounts[rank], sdtype,
- prcv, rcounts[rank], rdtype);
- }
-
- /* If only one process, we're done. */
- if (1 == size) {
- return MPI_SUCCESS;
- }
-
- /* Now, initiate all send/recv to/from others. */
- nreqs = 0;
- preq = ireqs;
-
- /* Post all receives first */
- for (i = 0; i < size; ++i) {
- if (i == rank || 0 == rcounts[i]) {
- continue;
- }
-
- prcv = ((char *) rbuf) + (rdisps[i] * rext);
-
- *preq = Request::irecv_init(prcv, rcounts[i], rdtype,
- i, COLL_TAG_ALLTOALLV, comm
- );
- preq++;
- ++nreqs;
-
- }
-
- /* Now post all sends */
- for (i = 0; i < size; ++i) {
- if (i == rank || 0 == scounts[i]) {
- continue;
- }
-
- psnd = ((char *) sbuf) + (sdisps[i] * sext);
- *preq=Request::isend_init(psnd, scounts[i], sdtype,
- i, COLL_TAG_ALLTOALLV, comm
- );
- preq++;
- ++nreqs;
- }
-
- /* Start your engines. This will never return an error. */
- Request::startall(nreqs, ireqs);
-
- /* Wait for them all. If there's an error, note that we don't care
- * what the error was -- just that there *was* an error. The PML
- * will finish all requests, even if one or more of them fail.
- * i.e., by the end of this call, all the requests are free-able.
- * So free them anyway -- even if there was an error, and return the
- * error after we free everything. */
- Request::waitall(nreqs, ireqs,
- MPI_STATUSES_IGNORE);
-
- /* Free the requests. */
- for (i = 0; i < nreqs; ++i) {
- if(ireqs[i]!=MPI_REQUEST_NULL)
- Request::unref(&ireqs[i]);
- }
- free(ireqs);
-
- return MPI_SUCCESS;
-}
-
