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 |
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INTEGER, INTENT(OUT) :: status |
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INTEGER, OPTIONAL, INTENT(OUT) :: ierror |
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DOUBLE PRECISION MPI_Wtick() | |||
DOUBLE PRECISION MPI_Wtime() |
comm |
Communicator (handle). |
top_type |
Topology type of communicator comm (choice). |
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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
Cartesian topology | |||||
distributed graph topology | |||||
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