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Name
MPI_Cart_get - Retrieves Cartesian topology information associated
with a communicator.
Syntax
C Syntax
#include <mpi.h>
int MPI_Cart_get(MPI_Comm comm, int maxdims, int dims[], int periods[],
int coords[])
Fortran Syntax
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_CART_GET(COMM, MAXDIMS, DIMS, PERIODS, COORDS, IERROR)
INTEGER COMM, MAXDIMS, DIMS(*), COORDS(*), IERROR
LOGICAL PERIODS(*)
Fortran 2008 Syntax
USE mpi_f08
MPI_Cart_get(comm, maxdims, dims, periods, coords, ierror)
TYPE(MPI_Comm), INTENT(IN) :: comm
INTEGER, INTENT(IN) :: maxdims
INTEGER, INTENT(OUT) :: dims(maxdims), coords(maxdims)
LOGICAL, INTENT(OUT) :: periods(maxdims)
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
Input Parameters
comm: Communicator with Cartesian structure (handle).maxdims: Length of vectors dims, periods, and coords in the calling program (integer).
Output Parameters
dims: Number of processes for each Cartesian dimension (array of integers).periods: Periodicity (true/false) for each Cartesian dimension (array of logicals).coords: Coordinates of calling process in Cartesian structure (array of integers).IERROR: Fortran only: Error status (integer).
Description
The functions MPI_Cartdim_get and MPI_Cart_get return the Cartesian
topology information that was associated with a communicator by
MPI_Cart_create.
Errors
Almost all MPI routines return an error value; C routines as the value
of the function and Fortran routines in the last argument.
Before the error value is returned, the current MPI error handler is
called. By default, this error handler aborts the MPI job, except for
I/O function errors. The error handler may be changed with
MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN
may be used to cause error values to be returned. Note that MPI does not
guarantee that an MPI program can continue past an error.