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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
/*
* Copyright (c) 2004-2007 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2020 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2008 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) 2007-2012 Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2010-2012 Oak Ridge National Labs. All rights reserved.
* Copyright (c) 2012-2013 Los Alamos National Security, LLC. All rights
* reserved.
* Copyright (c) 2012-2013 Inria. All rights reserved.
* Copyright (c) 2015 Research Organization for Information Science
* and Technology (RIST). All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include <stdio.h>
#include "ompi/mpi/c/bindings.h"
#include "ompi/runtime/params.h"
#include "ompi/communicator/communicator.h"
#include "ompi/errhandler/errhandler.h"
#include "ompi/mca/topo/base/base.h"
#include "ompi/memchecker.h"
#if OMPI_BUILD_MPI_PROFILING
#if OPAL_HAVE_WEAK_SYMBOLS
#pragma weak MPI_Graph_create = PMPI_Graph_create
#endif
#define MPI_Graph_create PMPI_Graph_create
#endif
static const char FUNC_NAME[] = "MPI_Graph_create";
int MPI_Graph_create(MPI_Comm old_comm, int nnodes, const int indx[],
const int edges[], int reorder, MPI_Comm *comm_graph)
{
mca_topo_base_module_t* topo;
int err;
MEMCHECKER(
memchecker_comm(old_comm);
);
/* check the arguments */
if (MPI_PARAM_CHECK) {
OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
if (ompi_comm_invalid(old_comm)) {
return OMPI_ERRHANDLER_INVOKE (MPI_COMM_WORLD, MPI_ERR_COMM,
FUNC_NAME);
} else if (OMPI_COMM_IS_INTER(old_comm)) {
return OMPI_ERRHANDLER_NOHANDLE_INVOKE(MPI_ERR_COMM,
FUNC_NAME);
}
if (nnodes < 0) {
return OMPI_ERRHANDLER_INVOKE (old_comm, MPI_ERR_ARG,
FUNC_NAME);
} else if (nnodes >= 1 && ((NULL == indx) || (NULL == edges))) {
return OMPI_ERRHANDLER_INVOKE (old_comm, MPI_ERR_ARG,
FUNC_NAME);
}
if (nnodes > ompi_comm_size(old_comm)) {
return OMPI_ERRHANDLER_INVOKE (old_comm, MPI_ERR_ARG,
FUNC_NAME);
}
}
/* MPI-2.1 7.5.3 states that if nnodes == 0, all processes should
get MPI_COMM_NULL */
if (0 == nnodes) {
*comm_graph = MPI_COMM_NULL;
return MPI_SUCCESS;
}
if( nnodes > old_comm->c_local_group->grp_proc_count ) {
return OMPI_ERRHANDLER_INVOKE (old_comm, MPI_ERR_ARG,
FUNC_NAME);
}
/*
* everything seems to be alright with the communicator, we can go
* ahead and select a topology module for this purpose and create
* the new graph communicator
*/
if (OMPI_SUCCESS != (err = mca_topo_base_comm_select(old_comm,
NULL,
&topo,
OMPI_COMM_GRAPH))) {
return err;
}
#if OPAL_ENABLE_FT_MPI
/*
* An early check, so as to return early if we are using a broken
* communicator. This is not absolutely necessary since we will
* check for this, and other, error conditions during the operation.
*/
if( OPAL_UNLIKELY(!ompi_comm_iface_create_check(old_comm, &err)) ) {
OMPI_ERRHANDLER_RETURN(err, old_comm, err, FUNC_NAME);
}
#endif
/* Now let that topology module rearrange procs/ranks if it wants to */
err = topo->topo.graph.graph_create(topo, old_comm,
nnodes, indx, edges,
(0 == reorder) ? false : true, comm_graph);
if (MPI_SUCCESS != err) {
OBJ_RELEASE(topo);
return OMPI_ERRHANDLER_INVOKE(old_comm, err, FUNC_NAME);
}
/* All done */
return MPI_SUCCESS;
}
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