MPI_Cart_create

--- Makes a new communicator to which topology information has been attached

Input Parameters

comm_old: input communicator (handle)

ndims: number of dimensions of cartesian grid (integer)

dims: integer array of size ndims specifying the number of processes in each dimension

periods: logical array of size ndims specifying whether the grid is periodic (true ) or not (false ) in each dimension

reorder: ranking may be reordered (true ) or not (false ) (logical)

Output Parameter

comm_cart: communicator with new cartesian topology (handle)

Algorithm

We ignore the periods and reorder info currently.

Synopsis


#include "mpi.h"
int MPI_Cart_create ( comm_old, ndims, dims, periods, reorder, comm_cart )
MPI_Comm  comm_old;
int       ndims;     
int      *dims;     
int      *periods;
int       reorder;
MPI_Comm *comm_cart;

Location: cart_create.c