81 строка
2.3 KiB
C
81 строка
2.3 KiB
C
/*
|
|
* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
|
|
* University Research and Technology
|
|
* Corporation. All rights reserved.
|
|
* Copyright (c) 2004-2005 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.
|
|
* $COPYRIGHT$
|
|
*
|
|
* Additional copyrights may follow
|
|
*
|
|
* $HEADER$
|
|
*/
|
|
|
|
#include "ompi_config.h"
|
|
#include "ompi/mca/topo/base/base.h"
|
|
#include "ompi/communicator/communicator.h"
|
|
#include "ompi/mca/topo/topo.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,
|
|
int *coords,
|
|
int *rank){
|
|
int prank;
|
|
int dim;
|
|
int ord;
|
|
int factor;
|
|
int i;
|
|
int *d;
|
|
int *c;
|
|
|
|
/*
|
|
* Loop over coordinates computing the rank.
|
|
*/
|
|
factor = 1;
|
|
prank = 0;
|
|
|
|
i = comm->c_topo_comm->mtc_ndims_or_nnodes - 1;
|
|
d = comm->c_topo_comm->mtc_dims_or_index + i;
|
|
c = coords + i;
|
|
|
|
for (; i >= 0; --i, --c, --d) {
|
|
dim = *d;
|
|
ord = *c;
|
|
/* 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);
|
|
}
|