1
1
openmpi/ompi/mca/topo/base/topo_base_cart_create.c

111 строки
3.3 KiB
C
Исходник Обычный вид История

/*
* 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.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include "ompi/mca/topo/base/base.h"
#include "ompi/communicator/communicator.h"
#include "ompi/group/group.h"
#include "ompi/mca/topo/topo.h"
#include "mpi.h"
/*
* function - makes a new communicator to which topology information
* has been attached
*
* @param comm input communicator (handle)
* @param ndims number of dimensions of cartesian grid (integer)
* @param dims integer array of size ndims specifying the number of processes in
* each dimension
* @param periods logical array of size ndims specifying whether the grid is
* periodic (true) or not (false) in each dimension
* @param reorder ranking may be reordered (true) or not (false) (logical)
* @param comm_cart communicator with new cartesian topology (handle)
*
* Open MPI currently ignores the 'reorder' flag.
*
* @retval MPI_SUCCESS
*/
- massive change for module<-->component name fixes throughout the code base. - many (most) mca type names have "component" or "module" in them, as relevant, just to further distinguish the difference between component data/actions and module data/actions. All developers are encouraged to perpetuate this convention when you create types that are specific to a framework, component, or module - did very little to entire framework (just the basics to make it compile) because it's just about to be almost entirely replaced - ditto for io / romio - did not work on elan or ib components; have to commit and then convert those on a different machine with the right libraries and headers - renamed a bunch of *_module.c files to *_component.c and *module*c to *component*c (a few still remain, e.g., ptl/ib, ptl/elan, etc.) - modified autogen/configure/build process to match new filenames (e.g., output static-components.h instead of static-modules.h) - removed DOS-style cr/lf stuff in ns/ns.h - added newline to end of file src/util/numtostr.h - removed some redundant error checking in the top-level topo functions - added a few {} here and there where people "forgot" to put them in for 1 line blocks ;-) - removed a bunch of MPI_* types from mca header files (replaced with corresponding ompi_* types) - all the ptl components had version numbers in their structs; removed - converted a few more elements in the MCA base to use the OBJ interface -- removed some old manual reference counting kruft This commit was SVN r1830.
2004-08-02 04:24:22 +04:00
int mca_topo_base_cart_create (mca_topo_base_comm_t *topo_data,
int *proc_count,
ompi_proc_t **proc_pointers,
int *new_rank,
int ndims,
int *dims,
int *periods,
bool reorder) {
int nprocs;
int dim;
int i;
int *p;
int *coords = topo_data->mtc_coords;
int dummy_rank;
nprocs = 1;
p = topo_data->mtc_dims_or_index;
/* Calculate the number of processes in this grid */
for (i = 0; i < topo_data->mtc_ndims_or_nnodes; ++i, ++p) {
if(*p <= 0) {
return OMPI_ERROR;
}
nprocs *= *p;
}
/* check for the error condition */
if (*proc_count < nprocs) {
return MPI_ERR_DIMS;
}
/* check if we have to trim the list of processes */
if (nprocs < *proc_count) {
*proc_count = nprocs;
}
if (*new_rank > (nprocs-1)) {
/* sorry, but in our scheme this process is cut off */
*new_rank = MPI_UNDEFINED;
return MPI_SUCCESS;
}
for (i = 0, p = topo_data->mtc_dims_or_index; i < ndims; ++i, ++p) {
*p = (*periods) ? -(*dims) : *dims;
++dims;
++periods;
}
/* Have to replace this with the actual function body itself */
p = topo_data->mtc_dims_or_index;
coords = topo_data->mtc_coords;
dummy_rank = *new_rank;
for (i=0;
(i < topo_data->mtc_ndims_or_nnodes && i < ndims);
++i, ++p) {
dim = (*p > 0) ? *p : -(*p);
nprocs /= dim;
*coords++ = dummy_rank / nprocs;
dummy_rank %= nprocs;
}
/* end here */
return MPI_SUCCESS;
}