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MPI_Op_commutative - Query of commutativity of reduction operation.
#include <mpi.h>
int MPI_Op_commutative(MPI_Op op, int *commute)
USE MPI
! or the older form: INCLUDE ’mpif.h’
MPI_OP_COMMUTATIVE(OP, COMMUTE, IERROR)
LOGICAL COMMUTE
INTEGER OP, IERROR
USE mpi_f08
MPI_Op_commutative(op, commute, ierror)
TYPE(MPI_Op), INTENT(IN) :: op
INTEGER, INTENT(OUT) :: commute
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
#include <mpi.h>
bool Op::Is_commutative()
- op
- Operation (handle).
- commute
- True if
op is commutative, false otherwise (logical).
- IERROR
- Fortran only: Error
status (integer).
Reduction operations can be queried for their
commutativity.
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_Op_create
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