xt_exchanger_mix_isend_irecv.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.
 *
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
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 * 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
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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 */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <assert.h>
#include <mpi.h>

#include "core/core.h"
#include "core/ppm_xfuncs.h"
#include "xt/xt_mpi.h"
#include "xt_mpi_internal.h"
#include "xt_redist_internal.h"
#include "xt_exchanger.h"
#include "xt_exchanger_mix_isend_irecv.h"

static Xt_exchanger
xt_exchanger_mix_isend_irecv_copy(Xt_exchanger exchanger,
                                  MPI_Comm newComm, int new_tag_offset);
static void xt_exchanger_mix_isend_irecv_delete(Xt_exchanger exchanger);
static void xt_exchanger_mix_isend_irecv_s_exchange(Xt_exchanger exchanger,
                                                    const void * src_data,
                                                    void * dst_data);
static int
xt_exchanger_mix_isend_irecv_get_msg_ranks(Xt_exchanger exchanger,
                                           enum xt_msg_direction direction,
                                           int **ranks);

static MPI_Datatype
xt_exchanger_mix_isend_irecv_get_MPI_Datatype(Xt_exchanger exchanger,
                                              int rank,
                                              enum xt_msg_direction direction);

static const struct xt_exchanger_vtable exchanger_mix_isend_irecv_vtable = {
  .copy = xt_exchanger_mix_isend_irecv_copy,
  .delete = xt_exchanger_mix_isend_irecv_delete,
  .s_exchange = xt_exchanger_mix_isend_irecv_s_exchange,
  .get_msg_ranks = xt_exchanger_mix_isend_irecv_get_msg_ranks,
  .get_MPI_Datatype = xt_exchanger_mix_isend_irecv_get_MPI_Datatype,
};

typedef struct Xt_exchanger_mix_isend_irecv_ * Xt_exchanger_mix_isend_irecv;

struct mix_msg {
  struct Xt_redist_msg data;
  enum xt_msg_direction type;
};

struct Xt_exchanger_mix_isend_irecv_ {

  const struct xt_exchanger_vtable * vtable;

  int n, tag_offset;
  MPI_Comm comm;
  struct mix_msg msgs[];
};

static Xt_exchanger_mix_isend_irecv
xt_exchanger_mix_isend_irecv_alloc(size_t nmsg)
{
  Xt_exchanger_mix_isend_irecv exchanger;
  size_t header_size = sizeof (*exchanger),
    body_size = sizeof (struct mix_msg) * nmsg;
  exchanger = xmalloc(header_size + body_size);
  exchanger->n = (int)nmsg;
  exchanger->vtable = &exchanger_mix_isend_irecv_vtable;
  return exchanger;
}

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

  assert((nsend >= 0) & (nrecv >= 0));
  size_t nmsg = (size_t)nsend + (size_t)nrecv;
  Xt_exchanger_mix_isend_irecv exchanger
    = xt_exchanger_mix_isend_irecv_alloc(nmsg);
  exchanger->comm = comm, exchanger->tag_offset = tag_offset;
  struct mix_msg *restrict msgs = exchanger->msgs;
  xt_redist_msgs_strided_copy((size_t)nsend, send_msgs, sizeof (send_msgs[0]),
                              &(msgs[0].data), sizeof (msgs[0]), comm);
  for (size_t i = 0; i < (size_t)nsend; ++i)
    msgs[i].type = SEND;
  xt_redist_msgs_strided_copy((size_t)nrecv, recv_msgs, sizeof (recv_msgs[0]),
                              &(msgs[nsend].data), sizeof (msgs[0]), comm);
  for (size_t i = 0; i < (size_t)nrecv; ++i)
    msgs[i + (size_t)nsend].type = RECV;

  xt_exchanger_internal_optimize(nmsg, msgs, sizeof(*msgs), comm);

  for (size_t i = 1; i < nmsg; ++i) {

    if ((msgs[i-1].data.rank == msgs[i].data.rank) && (msgs[i].type == SEND)) {

      struct mix_msg temp = msgs[i-1];
      msgs[i-1] = msgs[i];
      msgs[i] = temp;
      i++;
    }
  }

  return (Xt_exchanger)exchanger;
}

static Xt_exchanger
xt_exchanger_mix_isend_irecv_copy(Xt_exchanger exchanger,
                                  MPI_Comm new_comm, int new_tag_offset)
{
  Xt_exchanger_mix_isend_irecv exchanger_msr =
    (Xt_exchanger_mix_isend_irecv)exchanger;
  size_t nmsg = (size_t)exchanger_msr->n;
  Xt_exchanger_mix_isend_irecv exchanger_copy
    = xt_exchanger_mix_isend_irecv_alloc(nmsg);
  exchanger_copy->comm = new_comm;
  exchanger_copy->tag_offset = new_tag_offset;
  struct mix_msg *restrict new_msgs = exchanger_copy->msgs,
    *restrict orig_msgs = exchanger_msr->msgs;
  xt_redist_msgs_strided_copy(nmsg, &orig_msgs->data, sizeof (*orig_msgs),
                              &new_msgs->data, sizeof (*new_msgs),
                              new_comm);
  for (size_t i = 0; i < nmsg; ++i)
    new_msgs[i].type = orig_msgs[i].type;
  return (Xt_exchanger)exchanger_copy;
}


static void xt_exchanger_mix_isend_irecv_delete(Xt_exchanger exchanger) {

  Xt_exchanger_mix_isend_irecv exchanger_msr =
    (Xt_exchanger_mix_isend_irecv)exchanger;

  size_t nmsg = (size_t)exchanger_msr->n;
  struct mix_msg *restrict msgs = exchanger_msr->msgs;

  xt_redist_msgs_strided_destruct(nmsg, &msgs[0].data, exchanger_msr->comm,
                                  sizeof (*msgs));
  free(exchanger_msr);
}

static void xt_exchanger_mix_isend_irecv_s_exchange(Xt_exchanger exchanger,
                                                    const void * src_data,
                                                    void * dst_data) {

  Xt_exchanger_mix_isend_irecv exchanger_msr =
    (Xt_exchanger_mix_isend_irecv)exchanger;

  if (exchanger_msr->n > 0) {
    size_t nmsg = (size_t)exchanger_msr->n;
    MPI_Comm comm = exchanger_msr->comm;
    struct mix_msg *restrict msgs = exchanger_msr->msgs;
    int tag_offset = exchanger_msr->tag_offset;
    MPI_Request *requests = xmalloc(nmsg * sizeof (*requests));
    for (size_t i = 0; i < nmsg; ++i) {
      typedef int (*ifp)(void *buf, int count, MPI_Datatype datatype, int dest,
                         int tag, MPI_Comm comm, MPI_Request *request);
      ifp op = msgs[i].type == SEND ? (ifp)MPI_Isend : (ifp)MPI_Irecv;
      void *data = msgs[i].type == SEND ? (void *)src_data : dst_data;
      xt_mpi_call(op(data, 1, msgs[i].data.datatype,
                     msgs[i].data.rank,
                     tag_offset + xt_mpi_tag_exchange_msg,
                     comm, requests+i), comm);
    }
    xt_mpi_call(MPI_Waitall((int)nmsg, requests, MPI_STATUSES_IGNORE), comm);
    free(requests);
  }
}

static int
xt_exchanger_mix_isend_irecv_get_msg_ranks(Xt_exchanger exchanger,
                                           enum xt_msg_direction direction,
                                           int **ranks)
{
  Xt_exchanger_mix_isend_irecv exchanger_msr =
    (Xt_exchanger_mix_isend_irecv)exchanger;
  size_t nmsg = 0, nmsg_all = (size_t)exchanger_msr->n;
  const struct mix_msg *restrict msgs = exchanger_msr->msgs;
  for (size_t i = 0; i < nmsg_all; ++i)
    nmsg += msgs[i].type == direction;
  int *restrict ranks_ = *ranks = xmalloc(nmsg * sizeof (*ranks_));
  for (size_t i = 0, j = (size_t)-1; i < nmsg_all; ++i)
    if (msgs[i].type == direction)
      ranks_[++j] = msgs[i].data.rank;
  return (int)nmsg;
}

static MPI_Datatype
xt_exchanger_mix_isend_irecv_get_MPI_Datatype(Xt_exchanger exchanger,
                                              int rank,
                                              enum xt_msg_direction direction)
{
  Xt_exchanger_mix_isend_irecv exchanger_msr =
    (Xt_exchanger_mix_isend_irecv)exchanger;
  size_t nmsg = (size_t)exchanger_msr->n;
  struct mix_msg *restrict msgs = exchanger_msr->msgs;
  MPI_Datatype datatype_copy = MPI_DATATYPE_NULL;
  for (size_t i = 0; i < nmsg; ++i)
    if (msgs[i].type == direction && msgs[i].data.rank == rank) {
      xt_mpi_call(MPI_Type_dup(msgs[i].data.datatype, &datatype_copy),
                  exchanger_msr->comm);
      break;
    }
  return datatype_copy;
}

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