1 /* Copyright (c) 2013-2014. 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.h"
8 //#include <star-reduction.c>
9 using namespace simgrid::smpi;
11 // this requires that count >= NP
12 int Coll_allreduce_rab2::allreduce(void *sbuff, void *rbuff,
13 int count, MPI_Datatype dtype,
14 MPI_Op op, MPI_Comm comm)
18 int nbytes, send_size, s_offset, r_offset;
19 void *recv, *send, *tmp;
21 #ifdef MPICH2_REDUCTION
22 MPI_User_function * uop = MPIR_Op_table[op % 16 - 1];
24 MPI_User_function *uop;
25 struct MPIR_OP *op_ptr;
26 op_ptr = MPIR_ToPointer(op);
31 nprocs = comm->size();
34 s_extent = dtype->get_extent();
41 send_size = (count + nprocs) / nprocs;
42 nbytes = send_size * s_extent;
44 send = (void *) smpi_get_tmp_sendbuffer(s_extent * send_size * nprocs);
45 recv = (void *) smpi_get_tmp_recvbuffer(s_extent * send_size * nprocs);
46 tmp = (void *) smpi_get_tmp_sendbuffer(nbytes);
48 memcpy(send, sbuff, s_extent * count);
50 Colls::alltoall(send, send_size, dtype, recv, send_size, dtype, comm);
52 memcpy(tmp, recv, nbytes);
54 for (i = 1, s_offset = nbytes; i < nprocs; i++, s_offset = i * nbytes)
55 if(op!=MPI_OP_NULL) op->apply( (char *) recv + s_offset, tmp, &send_size, dtype);
57 Colls::allgather(tmp, send_size, dtype, recv, send_size, dtype, comm);
58 memcpy(rbuff, recv, count * s_extent);
60 smpi_free_tmp_buffer(recv);
61 smpi_free_tmp_buffer(tmp);
62 smpi_free_tmp_buffer(send);
65 send_size = count / nprocs;
66 nbytes = send_size * s_extent;
67 r_offset = rank * nbytes;
69 recv = (void *) smpi_get_tmp_recvbuffer(s_extent * send_size * nprocs);
71 Colls::alltoall(send, send_size, dtype, recv, send_size, dtype, comm);
73 memcpy((char *) rbuff + r_offset, recv, nbytes);
75 for (i = 1, s_offset = nbytes; i < nprocs; i++, s_offset = i * nbytes)
76 if(op!=MPI_OP_NULL) op->apply( (char *) recv + s_offset, (char *) rbuff + r_offset,
79 Colls::allgather((char *) rbuff + r_offset, send_size, dtype, rbuff, send_size,
81 smpi_free_tmp_buffer(recv);