xt_exchanger_irecv_isend.c

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/*
 * Keywords:
 * Maintainer: Jörg Behrens <behrens@dkrz.de>
 *             Moritz Hanke <hanke@dkrz.de>
 *             Thomas Jahns <jahns@dkrz.de>
 * URL: https://doc.redmine.dkrz.de/yaxt/html/
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are  permitted provided that the following conditions are
 * met:
 *
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
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 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 * Neither the name of the DKRZ GmbH nor the names of its contributors
 * may be used to endorse or promote products derived from this software
 * without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "core/ppm_xfuncs.h"
#include "xt/xt_mpi.h"
#include "xt_mpi_internal.h"
#include "xt_redist_internal.h"
#include "xt_exchanger_irecv_isend.h"
#include "xt_exchanger_simple_base.h"

static void
xt_exchanger_irecv_isend_s_exchange(const void *src_data, void *dst_data,
                                    int nsend, int nrecv,
                                    struct Xt_redist_msg * send_msgs,
                                    struct Xt_redist_msg * recv_msgs,
                                    int tag_offset, MPI_Comm comm) {

  MPI_Request *requests
    = xmalloc((size_t)(nrecv + nsend) * sizeof (*requests));

  for (int i = 0; i < nrecv; ++i)
    xt_mpi_call(MPI_Irecv(dst_data, 1, recv_msgs[i].datatype,
                          recv_msgs[i].rank,
                          tag_offset + xt_mpi_tag_exchange_msg, comm,
                          requests+i), comm);

  for (int i = 0; i < nsend; ++i)
    xt_mpi_call(MPI_Isend((void *)src_data, 1, send_msgs[i].datatype,
                          send_msgs[i].rank,
                          tag_offset + xt_mpi_tag_exchange_msg, comm,
                          requests+nrecv+i), comm);

  xt_mpi_call(MPI_Waitall(nrecv + nsend, requests, MPI_STATUSES_IGNORE), comm);

  free(requests);
}

Xt_exchanger
xt_exchanger_irecv_isend_new(int nsend, int nrecv,
                             struct Xt_redist_msg * send_msgs,
                             struct Xt_redist_msg * recv_msgs,
                             MPI_Comm comm, int tag_offset) {

  return xt_exchanger_simple_base_new(nsend, nrecv, send_msgs, recv_msgs,
                                      comm, tag_offset,
                                      xt_exchanger_irecv_isend_s_exchange);
}


/*
 * Local Variables:
 * c-basic-offset: 2
 * coding: utf-8
 * indent-tabs-mode: nil
 * show-trailing-whitespace: t
 * require-trailing-newline: t
 * End:
 */