/*****************************************************************************

 * Function: alltoall_ring_mpi_barrier

 * 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 in P - 1 steps. In step i, node j - i -> j -> j + i.
           MPI barriers are added between each two phases.

 * Auther: Ahmad Faraj

 ****************************************************************************/
int
smpi_coll_tuned_alltoall_ring_mpi_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_Status s;
  MPI_Aint send_chunk, recv_chunk;
  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 = smpi_comm_rank(comm);
  num_procs = smpi_comm_size(comm);
  send_chunk = smpi_datatype_get_extent(send_type);
  recv_chunk = smpi_datatype_get_extent(recv_type);

  send_chunk *= send_count;
  recv_chunk *= recv_count;

  for (i = 0; i < num_procs; i++) {
    src = (rank - i + num_procs) % num_procs;
    dst = (rank + i) % num_procs;

    smpi_mpi_barrier(comm);
    smpi_mpi_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;
}
Exemplo n.º 2
0
/*****************************************************************************

 * Function: alltoall_pair_mpi_barrier

 * 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. MPI barriers are
           inserted between each two phases.

 * Auther: Ahmad Faraj

 ****************************************************************************/
int
smpi_coll_tuned_alltoallv_pair_mpi_barrier(void *send_buff, int *send_counts, int *send_disps,
                                          MPI_Datatype send_type,
                                          void *recv_buff, int *recv_counts, int *recv_disps,
                                          MPI_Datatype recv_type, MPI_Comm comm)
{
  MPI_Status s;
  MPI_Aint send_chunk, recv_chunk;
  int i, src, dst, rank, num_procs;
  int tag = 101;
  char *send_ptr = (char *) send_buff;
  char *recv_ptr = (char *) recv_buff;

  rank = smpi_comm_rank(comm);
  num_procs = smpi_comm_size(comm);
  send_chunk = smpi_datatype_get_extent(send_type);
  recv_chunk = smpi_datatype_get_extent(recv_type);

  for (i = 0; i < num_procs; i++) {
    src = dst = rank ^ i;
    smpi_mpi_barrier(comm);
    smpi_mpi_sendrecv(send_ptr + send_disps[dst] * send_chunk, send_counts[dst], send_type, dst,
                 tag, recv_ptr + recv_disps[src] * recv_chunk, recv_counts[src], recv_type,
                 src, tag, comm, &s);
  }
  return MPI_SUCCESS;
}
Exemplo n.º 3
0
static void action_barrier(const char *const *action){
  double clock = smpi_process_simulated_elapsed();
#ifdef HAVE_TRACING
  int rank = smpi_comm_rank(MPI_COMM_WORLD);
  TRACE_smpi_computing_out(rank);
  TRACE_smpi_collective_in(rank, -1, __FUNCTION__);
#endif
  smpi_mpi_barrier(MPI_COMM_WORLD);
#ifdef HAVE_TRACING
  TRACE_smpi_collective_out(rank, -1, __FUNCTION__);
  TRACE_smpi_computing_in(rank);
#endif

  if (XBT_LOG_ISENABLED(smpi_replay, xbt_log_priority_verbose)){
    char *name = xbt_str_join_array(action, " ");
    XBT_VERB("%s %f", name, smpi_process_simulated_elapsed()-clock);
    free(name);
  }
}