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>
10 // this requires that count >= NP
11 int Coll_allreduce_rab2::allreduce(void *sbuff, void *rbuff,
12 int count, MPI_Datatype dtype,
13 MPI_Op op, MPI_Comm comm)
17 int nbytes, send_size, s_offset, r_offset;
18 void *recv, *send, *tmp;
20 #ifdef MPICH2_REDUCTION
21 MPI_User_function * uop = MPIR_Op_table[op % 16 - 1];
23 MPI_User_function *uop;
24 struct MPIR_OP *op_ptr;
25 op_ptr = MPIR_ToPointer(op);
30 nprocs = comm->size();
33 s_extent = dtype->get_extent();
40 send_size = (count + nprocs) / nprocs;
41 nbytes = send_size * s_extent;
43 send = (void *) smpi_get_tmp_sendbuffer(s_extent * send_size * nprocs);
44 recv = (void *) smpi_get_tmp_recvbuffer(s_extent * send_size * nprocs);
45 tmp = (void *) smpi_get_tmp_sendbuffer(nbytes);
47 memcpy(send, sbuff, s_extent * count);
49 Colls::alltoall(send, send_size, dtype, recv, send_size, dtype, comm);
51 memcpy(tmp, recv, nbytes);
53 for (i = 1, s_offset = nbytes; i < nprocs; i++, s_offset = i * nbytes)
54 if(op!=MPI_OP_NULL) op->apply( (char *) recv + s_offset, tmp, &send_size, dtype);
56 Colls::allgather(tmp, send_size, dtype, recv, send_size, dtype, comm);
57 memcpy(rbuff, recv, count * s_extent);
59 smpi_free_tmp_buffer(recv);
60 smpi_free_tmp_buffer(tmp);
61 smpi_free_tmp_buffer(send);
64 send_size = count / nprocs;
65 nbytes = send_size * s_extent;
66 r_offset = rank * nbytes;
68 recv = (void *) smpi_get_tmp_recvbuffer(s_extent * send_size * nprocs);
70 Colls::alltoall(send, send_size, dtype, recv, send_size, dtype, comm);
72 memcpy((char *) rbuff + r_offset, recv, nbytes);
74 for (i = 1, s_offset = nbytes; i < nprocs; i++, s_offset = i * nbytes)
75 if(op!=MPI_OP_NULL) op->apply( (char *) recv + s_offset, (char *) rbuff + r_offset,
78 Colls::allgather((char *) rbuff + r_offset, send_size, dtype, rbuff, send_size,
80 smpi_free_tmp_buffer(recv);