1 /* Copyright (c) 2013-2022. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
7 #include "../colls_private.hpp"
9 int flattree_segment_in_byte = 8192;
10 namespace simgrid::smpi {
11 int bcast__flattree_pipeline(void *buff, int count,
12 MPI_Datatype data_type, int root,
15 int i, j, rank, num_procs;
16 int tag = COLL_TAG_BCAST;
19 extent = data_type->get_extent();
21 int segment = flattree_segment_in_byte / extent;
22 segment = segment == 0 ? 1 :segment;
23 int pipe_length = count / segment;
24 int increment = segment * extent;
26 XBT_INFO("MPI_bcast_flattree_pipeline: pipe_length=0, use default MPI_bcast_flattree.");
27 return bcast__flattree(buff, count, data_type, root, comm);
30 num_procs = comm->size();
32 auto* request_array = new MPI_Request[pipe_length];
33 auto* status_array = new MPI_Status[pipe_length];
36 for (i = 0; i < pipe_length; i++) {
37 request_array[i] = Request::irecv((char *)buff + (i * increment), segment, data_type, root, tag, comm);
39 Request::waitall(pipe_length, request_array, status_array);
43 // Root sends data to all others
44 for (j = 0; j < num_procs; j++) {
48 for (i = 0; i < pipe_length; i++) {
49 Request::send((char *)buff + (i * increment), segment, data_type, j, tag, comm);
56 delete[] request_array;
57 delete[] status_array;
61 } // namespace simgrid::smpi