Manpages - MPI_Cartdim_get.3

*MPI_Cartdim_get * - Retrieves Cartesian topology information associated with a communicator.

  #include <mpi.h>
  int MPI_Cartdim_get(MPI_Comm comm, int *ndims)

  USE MPI
  ! or the older form: INCLUDE 'mpif.h'
  MPI_CARTDIM_GET(COMM, NDIMS, IERROR)
  	INTEGER	COMM, NDIMS, IERROR

  USE mpi_f08
  MPI_Cartdim_get(comm, ndims, ierror)
  	TYPE(MPI_Comm), INTENT(IN) :: comm
  	INTEGER, INTENT(OUT) :: ndims
  	INTEGER, OPTIONAL, INTENT(OUT) :: ierror

  #include <mpi.h>
  int Cartcomm::Get_dim() const

comm

Communicator with Cartesian structure (handle).

ndims

Number of dimensions of the Cartesian structure (integer).

IERROR

Fortran only: Error status (integer).

MPI_Cartdim_get returns the number of dimensions of the Cartesian structure.

Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument. C++ functions do not return errors. If the default error handler is set to MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism will be used to throw an MPI::Exception object.

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.

  MPI_Cart_get
  MPI_Cart_create