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Name
MPI_Comm_compare - Compares two communicators.
Syntax
C Syntax
#include <mpi.h>
int MPI_Comm_compare(MPI_Comm comm1, MPI_Comm comm2, int *result)
Fortran Syntax
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_COMM_COMPARE(COMM1, COMM2, RESULT, IERROR)
INTEGER COMM1, COMM2, RESULT, IERROR
Fortran 2008 Syntax
USE mpi_f08
MPI_Comm_compare(comm1, comm2, result, ierror)
TYPE(MPI_Comm), INTENT(IN) :: comm1, comm2
INTEGER, INTENT(OUT) :: result
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
Input Parameters
comm1: Comm1 (handle).comm2: Comm2 (handle).
Output Parameters
result: Result of comparison (integer).IERROR: Fortran only: Error status (integer).
Description
MPI_IDENT results if and only if comm1 and comm2 are handles for the
same object (identical groups and same contexts). MPI_CONGRUENT results
if the underlying groups are identical in constituents and rank order;
these communicators differ only by context. MPI_SIMILAR results of the
group members of both communicators are the same but the rank order
differs. MPI_UNEQUAL results otherwise.
Errors
Almost all MPI routines return an error value; C routines as the value
of the function and Fortran routines in the last argument.
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.