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MPI_Topo_test

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