+++ /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"
-/*****************************************************************************
-
- * Function: alltoall_pair
-
- * Return: int
-
- * Inputs:
- send_buff: send input buffer
- send_count: number of elements to send
- send_type: data type of elements being sent
- recv_buff: receive output buffer
- recv_count: number of elements to received
- recv_type: data type of elements being received
- comm: communicator
-
- * Descrp: Function works when P is power of two. In each phase of P - 1
- phases, nodes in pair communicate their data.
-
- * Auther: Ahmad Faraj
-
- ****************************************************************************/
-int
-smpi_coll_tuned_alltoall_pair_one_barrier(void *send_buff, int send_count,
- MPI_Datatype send_type,
- void *recv_buff, int recv_count,
- MPI_Datatype recv_type, MPI_Comm comm)
-{
-
- MPI_Aint send_chunk, recv_chunk;
- MPI_Status s;
- int i, src, dst, rank, num_procs;
- int tag = COLL_TAG_ALLTOALL;
-
- char *send_ptr = (char *) send_buff;
- char *recv_ptr = (char *) recv_buff;
-
- rank = comm->rank();
- num_procs = comm->size();
-
- if((num_procs&(num_procs-1)))
- THROWF(arg_error,0, "alltoall pair algorithm can't be used with non power of two number of processes ! ");
-
- send_chunk = send_type->get_extent();
- recv_chunk = recv_type->get_extent();
-
- send_chunk *= send_count;
- recv_chunk *= recv_count;
-
- mpi_coll_barrier_fun(comm);
- for (i = 0; i < num_procs; i++) {
- src = dst = rank ^ i;
- Request::sendrecv(send_ptr + dst * send_chunk, send_count, send_type, dst,
- tag, recv_ptr + src * recv_chunk, recv_count, recv_type,
- src, tag, comm, &s);
- }
-
- return MPI_SUCCESS;
-}