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/*
* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2013 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* Copyright (c) 2004-2005 The Regents of the University of California.
* All rights reserved.
* Copyright (c) 2012-2013 Inria. All rights reserved.
* Copyright (c) 2014 Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2014-2015 Research Organization for Information Science
* and Technology (RIST). All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include "ompi/mca/topo/base/base.h"
#include "ompi/mca/topo/topo.h"
/*
*
* function - makes a new communicator to which topology information
* has been attached
*
* @param comm_old input communicator without topology (handle)
* @param nnodes number of nodes in graph (integer)
* @param index array of integers describing node degrees (see below)
* @param edges array of integers describing graph edges (see below)
* @param reorder ranking may be reordered (true) or not (false) (logical)
* @param comm_graph communicator with graph topology added (handle)
*
* @retval MPI_SUCCESS
* @retval MPI_ERR_OUT_OF_RESOURCE
*/
int mca_topo_base_graph_create(mca_topo_base_module_t *topo,
ompi_communicator_t* old_comm,
int nnodes,
const int *index,
const int *edges,
bool reorder,
ompi_communicator_t** comm_topo)
{
ompi_communicator_t *new_comm;
int new_rank, num_procs, ret, i;
ompi_proc_t **topo_procs = NULL;
mca_topo_base_comm_graph_2_2_0_t* graph;
num_procs = old_comm->c_local_group->grp_proc_count;
new_rank = old_comm->c_local_group->grp_my_rank;
assert(topo->type == OMPI_COMM_GRAPH);
if( num_procs < nnodes ) {
return MPI_ERR_DIMS;
}
if( num_procs > nnodes ) {
num_procs = nnodes;
}
if( new_rank > (nnodes - 1) ) {
new_rank = MPI_UNDEFINED;
num_procs = 0;
nnodes = 0;
}
graph = OBJ_NEW(mca_topo_base_comm_graph_2_2_0_t);
if( NULL == graph ) {
return OMPI_ERR_OUT_OF_RESOURCE;
}
graph->nnodes = nnodes;
/* Don't do any of the other initialization if we're not supposed
to be part of the new communicator (because nnodes has been
reset to 0, making things like index[nnodes-1] be junk).
JMS: This should really be refactored to use
comm_create_group(), because ompi_comm_allocate() still
complains about 0-byte mallocs in debug builds for 0-member
groups. */
if (MPI_UNDEFINED != new_rank) {
graph->index = (int*)malloc(sizeof(int) * nnodes);
if (NULL == graph->index) {
OBJ_RELEASE(graph);
return OMPI_ERR_OUT_OF_RESOURCE;
}
memcpy(graph->index, index, nnodes * sizeof(int));
/* Graph communicator; copy the right data to the common information */
graph->edges = (int*)malloc(sizeof(int) * index[nnodes-1]);
if (NULL == graph->edges) {
OBJ_RELEASE(graph);
return OMPI_ERR_OUT_OF_RESOURCE;
}
memcpy(graph->edges, edges, index[nnodes-1] * sizeof(int));
topo_procs = (ompi_proc_t**)malloc(num_procs * sizeof(ompi_proc_t *));
if (NULL == topo_procs) {
OBJ_RELEASE(graph);
return OMPI_ERR_OUT_OF_RESOURCE;
}
if(OMPI_GROUP_IS_DENSE(old_comm->c_local_group)) {
memcpy(topo_procs,
old_comm->c_local_group->grp_proc_pointers,
num_procs * sizeof(ompi_proc_t *));
} else {
for(i = 0 ; i < num_procs; i++) {
topo_procs[i] = ompi_group_peer_lookup(old_comm->c_local_group,i);
}
}
}
/* allocate a new communicator */
new_comm = ompi_comm_allocate(nnodes, 0);
if (NULL == new_comm) {
free(topo_procs);
OBJ_RELEASE(graph);
return OMPI_ERR_OUT_OF_RESOURCE;
}
ret = ompi_comm_enable(old_comm, new_comm,
new_rank, num_procs, topo_procs);
if (OMPI_SUCCESS != ret) {
free(topo_procs);
OBJ_RELEASE(graph);
if (MPI_COMM_NULL != new_comm) {
new_comm->c_topo = NULL;
new_comm->c_flags &= ~OMPI_COMM_GRAPH;
ompi_comm_free (&new_comm);
}
return ret;
}
new_comm->c_topo = topo;
new_comm->c_topo->mtc.graph = graph;
new_comm->c_flags |= OMPI_COMM_GRAPH;
new_comm->c_topo->reorder = reorder;
*comm_topo = new_comm;
if( MPI_UNDEFINED == new_rank ) {
ompi_comm_free(&new_comm);
*comm_topo = MPI_COMM_NULL;
}
return OMPI_SUCCESS;
}
static void mca_topo_base_comm_graph_2_2_0_construct(mca_topo_base_comm_graph_2_2_0_t * graph) {
graph->nnodes = 0;
graph->index = NULL;
graph->edges = NULL;
}
static void mca_topo_base_comm_graph_2_2_0_destruct(mca_topo_base_comm_graph_2_2_0_t * graph) {
if (NULL != graph->index) {
free(graph->index);
}
if (NULL != graph->edges) {
free(graph->edges);
}
}
OBJ_CLASS_INSTANCE(mca_topo_base_comm_graph_2_2_0_t, opal_object_t,
mca_topo_base_comm_graph_2_2_0_construct,
mca_topo_base_comm_graph_2_2_0_destruct);
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