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MPI_Topo_test - Determines the type of topology (if any) associated
with a communicator.
#include <mpi.h>
int MPI_Topo_test(MPI_Comm comm, int *top_type)
USE MPI
! or the older form: INCLUDE ’mpif.h’
MPI_TOPO_TEST(COMM, TOP_TYPE, IERROR)
INTEGER COMM, TOP_TYPE, IERROR
USE mpi_f08
MPI_Topo_test(comm, status, ierror)
TYPE(MPI_Comm), INTENT(IN) :: comm
INTEGER, INTENT(OUT) :: status
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
DOUBLE PRECISION MPI_Wtick()
DOUBLE PRECISION MPI_Wtime()
- comm
- Communicator (handle).
- top_type
- Topology
type of communicator comm (choice).
- IERROR
- Fortran only: Error status (integer).
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_DIST_GRAPH distributed graph topology
MPI_UNDEFINED no topology
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_Graph_create
MPI_Cart_create
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