1 /* Copyright (c) 2013-2017. 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. */
8 * Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
9 * University Research and Technology
10 * Corporation. All rights reserved.
11 * Copyright (c) 2004-2009 The University of Tennessee and The University
12 * of Tennessee Research Foundation. All rights
14 * Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
15 * University of Stuttgart. All rights reserved.
16 * Copyright (c) 2004-2005 The Regents of the University of California.
17 * All rights reserved.
19 * Additional copyrights may follow
21 /* -*- Mode: C; c-basic-offset:4 ; -*- */
22 /* Copyright (c) 2001-2014, The Ohio State University. All rights
25 * This file is part of the MVAPICH2 software package developed by the
26 * team members of The Ohio State University's Network-Based Computing
27 * Laboratory (NBCL), headed by Professor Dhabaleswar K. (DK) Panda.
29 * For detailed copyright and licensing information, please refer to the
30 * copyright file COPYRIGHT in the top level MVAPICH2 directory.
34 * (C) 2001 by Argonne National Laboratory.
35 * See COPYRIGHT in top-level directory.
37 #include "../colls_private.hpp"
41 int Coll_allgather_mvapich2_smp::allgather(void *sendbuf,int sendcnt, MPI_Datatype sendtype,
42 void *recvbuf, int recvcnt,MPI_Datatype recvtype,
46 int local_rank, local_size;
47 int leader_comm_size = 0;
48 int mpi_errno = MPI_SUCCESS;
49 MPI_Aint recvtype_extent = 0; /* Datatype extent */
50 MPI_Comm shmem_comm, leader_comm;
52 if(comm->get_leaders_comm()==MPI_COMM_NULL){
56 if (not comm->is_uniform() || not comm->is_blocked())
57 THROWF(arg_error,0, "allgather MVAPICH2 smp algorithm can't be used with irregular deployment. Please insure that processes deployed on the same node are contiguous and that each node has the same number of processes");
66 /* extract the rank,size information for the intra-node communicator */
67 recvtype_extent=recvtype->get_extent();
69 shmem_comm = comm->get_intra_comm();
70 local_rank = shmem_comm->rank();
71 local_size = shmem_comm->size();
73 if (local_rank == 0) {
74 /* Node leader. Extract the rank, size information for the leader communicator */
75 leader_comm = comm->get_leaders_comm();
76 if(leader_comm==MPI_COMM_NULL){
77 leader_comm = MPI_COMM_WORLD;
79 leader_comm_size = leader_comm->size();
82 /*If there is just one node, after gather itself,
83 * root has all the data and it can do bcast*/
85 mpi_errno = Colls::gather(sendbuf, sendcnt,sendtype,
86 (void*)((char*)recvbuf + (rank * recvcnt * recvtype_extent)),
90 /*Since in allgather all the processes could have
91 * its own data in place*/
92 if(sendbuf == MPI_IN_PLACE) {
93 mpi_errno = Colls::gather((void*)((char*)recvbuf + (rank * recvcnt * recvtype_extent)),
95 recvbuf, recvcnt, recvtype,
98 mpi_errno = Colls::gather(sendbuf, sendcnt,sendtype,
99 recvbuf, recvcnt, recvtype,
103 /* Exchange the data between the node leaders*/
104 if (local_rank == 0 && (leader_comm_size > 1)) {
105 /*When data in each socket is different*/
106 if (comm->is_uniform() != 1) {
109 int *recvcnts = NULL;
110 int *node_sizes = NULL;
113 node_sizes = comm->get_non_uniform_map();
115 displs = static_cast<int *>(xbt_malloc(sizeof (int) * leader_comm_size));
116 recvcnts = static_cast<int *>(xbt_malloc(sizeof (int) * leader_comm_size));
117 if (not displs || not recvcnts) {
118 return MPI_ERR_OTHER;
120 recvcnts[0] = node_sizes[0] * recvcnt;
123 for (i = 1; i < leader_comm_size; i++) {
124 displs[i] = displs[i - 1] + node_sizes[i - 1] * recvcnt;
125 recvcnts[i] = node_sizes[i] * recvcnt;
129 void* sendbuf=((char*)recvbuf)+recvtype->get_extent()*displs[leader_comm->rank()];
131 mpi_errno = Colls::allgatherv(sendbuf,
132 (recvcnt*local_size),
140 void* sendtmpbuf=((char*)recvbuf)+recvtype->get_extent()*(recvcnt*local_size)*leader_comm->rank();
144 mpi_errno = Coll_allgather_mpich::allgather(sendtmpbuf,
145 (recvcnt*local_size),
147 recvbuf, (recvcnt*local_size), recvtype,
153 /*Bcast the entire data from node leaders to all other cores*/
154 mpi_errno = Colls::bcast (recvbuf, recvcnt * size, recvtype, 0, shmem_comm);