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MPI_Group_compare - Compares two groups.
#include <mpi.h>
int MPI_Group_compare(MPI_Group group1, MPI_Group group2,
int *result)
USE MPI
! or the older form: INCLUDE ’mpif.h’
MPI_GROUP_COMPARE(GROUP1, GROUP2, RESULT, IERROR)
INTEGER GROUP1, GROUP2, RESULT, IERROR
USE mpi_f08
MPI_Group_compare(group1, group2, result, ierror)
TYPE(MPI_Group), INTENT(IN) :: group1, group2
INTEGER, INTENT(OUT) :: result
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
- group1
- First group (handle).
- group2
- Second group (handle).
- result
- Integer which is MPI_IDENT if the order and members
of the two groups are the same, MPI_SIMILAR if only the members are the
same, and MPI_UNEQUAL otherwise.
- IERROR
- Fortran only: Error status (integer).
MPI_IDENT results if the group members and group order is exactly
the same in both groups. This happens for instance if group1 and group2
are the same handle. MPI_SIMILAR results if the group members are the same
but the order is different. MPI_UNEQUAL results otherwise.
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.
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