MPI_Op_commutative(3) Open MPI MPI_Op_commutative(3)
NAME
MPI_Op_commutative - Query of commutativity of reduction operation.
SYNTAX
C Syntax
#include <mpi.h>
int MPI_Op_commutative(MPI_Op op, int *commute)
Fortran Syntax
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_OP_COMMUTATIVE(OP, COMMUTE, IERROR)
LOGICAL COMMUTE
INTEGER OP, IERROR
Fortran 2008 Syntax
USE mpi_f08
MPI_Op_commutative(op, commute, ierror)
TYPE(MPI_Op), INTENT(IN) :: op
INTEGER, INTENT(OUT) :: commute
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
C++ Syntax
#include <mpi.h>
bool Op::Is_commutative()
INPUT PARAMETER
op Operation (handle).
OUTPUT PARAMETERS
commute True if op is commutative, false otherwise (logical).
IERROR Fortran only: Error status (integer).
DESCRIPTION
Reduction operations can be queried for their commutativity.
ERRORS
Almost all MPI routines return an error value; C routines as the value
of the function and Fortran routines in the last argument. C++ func-
tions 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.
SEE ALSO
MPI_Op_create
4.1.2 Nov 24, 2021 MPI_Op_commutative(3)
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