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/*
* Copyright (c) 2001-2002 The Trustees of Indiana University.
* All rights reserved.
* Copyright (c) 1998-2001 University of Notre Dame.
* All rights reserved.
* Copyright (c) 1994-1998 The Ohio State University.
* All rights reserved.
*
* This file is part of the LAM/MPI software package. For license
* information, see the LICENSE file in the top level directory of the
* LAM/MPI source distribution.
*
* $HEADER$
*
* $Id: graphmap.c,v 6.5 2002/12/11 19:15:11 jsquyres Exp $
*
* Function: - map processes to graph coordinates
* Accepts: - old communicator
* - # processes
* - node index array
* - array of edges
* - ptr caller's new rank
* Returns: - MPI_SUCCESS or error code
*/
#include <blktype.h>
#include <mpi.h>
#include <mpisys.h>
/*@
MPI_Graph_map - Maps process to graph topology information
Input Parameters:
+ comm - input communicator (handle)
. nnodes - number of graph nodes (integer)
. index - integer array specifying the graph structure, see
'MPI_GRAPH_CREATE'
- edges - integer array specifying the graph structure
Output Parameter:
. pnewrank - reordered rank of the calling process; 'MPI_UNDEFINED' if
the calling process does not belong to graph (integer)
.N fortran
.N Errors
.N MPI_SUCCESS
.N MPI_ERR_TOPOLOGY
.N MPI_ERR_COMM
.N MPI_ERR_ARG
.N ACK
@*/
int MPI_Graph_map(MPI_Comm comm, int nnodes, int *index,
int *edges, int *pnewrank)
{
int errcode;
int myrank;
lam_initerr();
lam_setfunc(BLKMPIGRAPHMAP);
/*
* Check the arguments.
*/
if (comm == MPI_COMM_NULL) {
return(lam_errfunc(MPI_COMM_WORLD,
BLKMPIGRAPHMAP, lam_mkerr(MPI_ERR_COMM, EINVAL)));
}
if (LAM_IS_INTER(comm)) {
return(lam_errfunc(comm,
BLKMPIGRAPHMAP, lam_mkerr(MPI_ERR_COMM, EINVAL)));
}
if ((nnodes < 1) || (index == 0) || (edges == 0) || (pnewrank == 0)) {
return(lam_errfunc(comm,
BLKMPIGRAPHMAP, lam_mkerr(MPI_ERR_ARG, EINVAL)));
}
/*
* Assign new rank.
*/
errcode = MPI_Comm_rank(comm, &myrank);
if (errcode != MPI_SUCCESS) {
return(lam_errfunc(comm, BLKMPIGRAPHMAP, errcode));
}
*pnewrank =
((myrank < 0) || (myrank >= nnodes)) ? MPI_UNDEFINED : myrank;
lam_resetfunc(BLKMPIGRAPHMAP);
return(MPI_SUCCESS);
}
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