Synopsis

int MPI_Cart_create(MPI_Comm comm_old, int ndims, int *dims, int *periods, 
                   int reorder, MPI_Comm *comm_cart)

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

Thread and Interrupt Safety

This routine is thread-safe. This means that this routine may be safely used by multiple threads without the need for any user-provided thread locks. However, the routine is not interrupt safe. Typically, this is due to the use of memory allocation routines such as malloc or other non-MPICH runtime routines that are themselves not interrupt-safe.

Notes for Fortran

All MPI objects (e.g., MPI_Datatype, MPI_Comm) are of type INTEGER in Fortran.

Errors

All MPI routines (except MPI_Wtime and MPI_Wtick) return an error value; C routines as the value of the function and Fortran routines in the last argument. Before the value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job. The error handler may be changed with MPI_Comm_set_errhandler (for communicators), MPI_File_set_errhandler (for files), and MPI_Win_set_errhandler (for RMA windows). The MPI-1 routine MPI_Errhandler_set may be used but its use is deprecated. The predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarentee that an MPI program can continue past an error; however, MPI implementations will attempt to continue whenever possible.

MPI_SUCCESS

No error; MPI routine completed successfully.

MPI_ERR_TOPOLOGY

Invalid topology. Either there is no topology associated with this communicator, or it is not the correct type (e.g., MPI_CART when expecting MPI_GRAPH).

MPI_ERR_DIMS

Invalid dimension argument. A dimension argument is null or its length is less than or equal to zero.

MPI_ERR_ARG

Invalid argument. Some argument is invalid and is not identified by a specific error class (e.g., MPI_ERR_RANK).

Location:cart_create.c