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MPI_Topo_test(3) man page (version 1.2.9)

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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++  func-
       tions  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.

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