NAME¶

MPI_Topo_test - Determines the type of topology (if any) associated with a communicator.

SYNTAX¶

C Syntax¶

#include <mpi.h>
int MPI_Topo_test(MPI_Comm  comm, int *top_type)

Fortran Syntax¶

INCLUDE 'mpif.h'
MPI_TOPO_TEST( COMM, TOP_TYPE, IERROR)
	INTEGER	 COMM, TOP_TYPE, IERROR

C++ Syntax¶

#include <mpi.h>
int Comm::Get_topology() const

INPUT PARAMETER¶

comm

Communicator (handle).

 

OUTPUT PARAMETERS¶

top_type

Topology type of communicator comm (choice).

IERROR

Fortran only: Error status (integer).

 

DESCRIPTION¶

The function MPI_Topo_test returns the type of topology that is assigned to a communicator. The output value top_type is one of the following:

    MPI_GRAPH		graph topology
    MPI_CART		Cartesian topology
    MPI_UNDEFINED	no topology

ERRORS¶

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.

SEE ALSO¶

MPI_Graph_create MPI_Cart_create