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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) 2008 Cisco Systems, Inc. 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 "ompi/mca/topo/base/base.h"
#include "ompi/communicator/communicator.h"
/*
* function - Determines process rank in communicator given Cartesian
* location
*
* @param comm communicator with cartesian structure (handle)
* @param coords integer array (of size 'ndims') specifying the cartesian
* coordinates of a process
* @param rank rank of specified process (integer)
*
* @retval MPI_SUCCESS
* @retval MPI_ERR_COMM
* @retval MPI_ERR_TOPOLOGY
* @retval MPI_ERR_ARG
*/
int mca_topo_base_cart_rank(ompi_communicator_t* comm,
const int *coords,
int *rank)
{
int prank;
int dim;
int ord;
int factor;
int i;
int *d;
/*
* Loop over coordinates computing the rank.
*/
factor = 1;
prank = 0;
i = comm->c_topo->mtc.cart->ndims - 1;
d = comm->c_topo->mtc.cart->dims + i;
for (; i >= 0; --i, --d) {
dim = *d;
ord = coords[i];
/* Per MPI-2.1 7.5.4 (description of MPI_CART_RANK), if the
dimension is periodic and the coordinate is outside of 0 <=
coord(i) < dim, then normalize it. If the dimension is not
periodic, it's an error. */
if ((ord < 0) || (ord >= dim)) {
ord %= dim;
if (ord < 0) {
ord += dim;
}
}
prank += factor * ord;
factor *= dim;
}
*rank = prank;
return(MPI_SUCCESS);
}
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