MPI_Comm_compare - Online Linux Manual PageSection : 3
Updated : Jan 21, 2016
Source : 1.10.2
Note : Open MPI

NAMEMPI_Comm_compare − Compares two communicators.

SYNTAX

C Syntax#include <mpi.h> int MPI_Comm_compare(MPI_Comm comm1, MPI_Comm comm2, int *result)

Fortran SyntaxINCLUDE 'mpif.h' MPI_COMM_COMPARE(COMM1, COMM2, RESULT, IERROR) INTEGER COMM1, COMM2, RESULT, IERROR

C++ Syntax#include <mpi.h> static int Comm::Compare(const Comm& comm1, const Comm& comm2)

INPUT PARAMETERScomm1  Comm1 (handle). comm2  Comm2 (handle).

OUTPUT PARAMETERSresult  Result of comparison (integer). IERROR  Fortran only: Error status (integer).

DESCRIPTIONMPI_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.

ERRORSAlmost 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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