1 /* Copyright (c) 2013-2019. 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"
8 #include "smpi_win.hpp"
10 /*****************************************************************************
12 * Function: alltoall_pair
17 send_buff: send input buffer
18 send_count: number of elements to send
19 send_type: data type of elements being sent
20 recv_buff: receive output buffer
21 recv_count: number of elements to received
22 recv_type: data type of elements being received
25 * Descrp: Function works when P is power of two. In each phase of P - 1
26 phases, nodes in pair communicate their data.
30 ****************************************************************************/
33 int Coll_alltoall_pair_rma::alltoall(void *send_buff, int send_count, MPI_Datatype send_type,
34 void *recv_buff, int recv_count, MPI_Datatype recv_type,
38 MPI_Aint send_chunk, recv_chunk;
41 int i, dst, rank, num_procs;
43 char *send_ptr = (char *) send_buff;
46 num_procs = comm->size();
47 send_chunk = send_type->get_extent();
48 recv_chunk = recv_type->get_extent();
50 win=new Win(recv_buff, num_procs * recv_chunk * send_count, recv_chunk, 0,
52 send_chunk *= send_count;
53 recv_chunk *= recv_count;
56 for (i = 0; i < num_procs; i++) {
58 win->put(send_ptr + dst * send_chunk, send_count, send_type, dst,
59 rank /* send_chunk*/, send_count, send_type);
67 int Coll_alltoall_pair::alltoall(void *send_buff, int send_count,
68 MPI_Datatype send_type,
69 void *recv_buff, int recv_count,
70 MPI_Datatype recv_type, MPI_Comm comm)
73 MPI_Aint send_chunk, recv_chunk;
75 int i, src, dst, rank, num_procs;
76 int tag = COLL_TAG_ALLTOALL;
77 char *send_ptr = (char *) send_buff;
78 char *recv_ptr = (char *) recv_buff;
81 num_procs = comm->size();
83 if((num_procs&(num_procs-1)))
84 THROWF(arg_error,0, "alltoall pair algorithm can't be used with non power of two number of processes ! ");
86 send_chunk = send_type->get_extent();
87 recv_chunk = recv_type->get_extent();
89 send_chunk *= send_count;
90 recv_chunk *= recv_count;
92 for (i = 0; i < num_procs; i++) {
94 Request::sendrecv(send_ptr + dst * send_chunk, send_count, send_type, dst, tag, recv_ptr + src * recv_chunk,
95 recv_count, recv_type, src, tag, comm, &s);