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openmpi/src/mpi/c/cart_create.c

96 строки
2.8 KiB
C
Исходник Обычный вид История

/*
* $HEADER$
*/
#include "ompi_config.h"
#include <stdio.h>
#include "mpi.h"
#include "mpi/c/bindings.h"
#include "communicator/communicator.h"
#include "mca/topo/topo.h"
#include "errhandler/errhandler.h"
#if OMPI_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
#pragma weak MPI_Cart_create = PMPI_Cart_create
#endif
#if OMPI_PROFILING_DEFINES
#include "mpi/c/profile/defines.h"
#endif
static const char FUNC_NAME[] = "MPI_Cart_create";
int MPI_Cart_create(MPI_Comm old_comm, int ndims, int *dims,
int *periods, int reorder, MPI_Comm *comm_cart) {
int err;
bool re_order = false;
/* check the arguments */
if (MPI_PARAM_CHECK) {
OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
if (MPI_COMM_NULL == old_comm) {
return OMPI_ERRHANDLER_INVOKE (MPI_COMM_WORLD, MPI_ERR_COMM,
FUNC_NAME);
}
if (OMPI_COMM_IS_INTER(old_comm)) {
return OMPI_ERRHANDLER_INVOKE (MPI_COMM_WORLD, MPI_ERR_COMM,
FUNC_NAME);
}
if (1 > ndims) {
return OMPI_ERRHANDLER_INVOKE (MPI_COMM_WORLD, MPI_ERR_ARG,
FUNC_NAME);
}
if (NULL == dims || NULL == periods || NULL == comm_cart) {
return OMPI_ERRHANDLER_INVOKE (MPI_COMM_WORLD, MPI_ERR_ARG,
FUNC_NAME);
}
if (0 > reorder || 1 < reorder) {
return OMPI_ERRHANDLER_INVOKE (MPI_COMM_WORLD, MPI_ERR_ARG,
FUNC_NAME);
}
/* check if the number of processes on the grid are corrct */
{
int i;
int *p = dims;
int count_nodes = 1;
int parent_procs = ompi_comm_size(old_comm);
for (i=0; i < ndims; i++) {
count_nodes *= *p;
p++;
}
if (parent_procs < count_nodes) {
return OMPI_ERRHANDLER_INVOKE (MPI_COMM_WORLD, 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 cartesian communicator
*/
re_order = (1 == reorder)? true :false;
err = ompi_topo_create (old_comm,
ndims,
dims,
periods,
re_order,
comm_cart,
OMPI_COMM_CART);
/* check the error status */
if (MPI_SUCCESS != err) {
return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, err, FUNC_NAME);
}
/* All done */
return MPI_SUCCESS;
}