1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
.. _mpi_op_commutative:
MPI_Op_commutative
==================
.. include_body
:ref:`MPI_Op_commutative` |mdash| Query of commutativity of reduction operation.
SYNTAX
------
C Syntax
^^^^^^^^
.. code-block:: c
#include <mpi.h>
int MPI_Op_commutative(MPI_Op op, int *commute)
Fortran Syntax
^^^^^^^^^^^^^^
.. code-block:: fortran
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_OP_COMMUTATIVE(OP, COMMUTE, IERROR)
LOGICAL COMMUTE
INTEGER OP, IERROR
Fortran 2008 Syntax
^^^^^^^^^^^^^^^^^^^
.. code-block:: fortran
USE mpi_f08
MPI_Op_commutative(op, commute, ierror)
TYPE(MPI_Op), INTENT(IN) :: op
INTEGER, INTENT(OUT) :: commute
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
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
------
.. include:: ./ERRORS.rst
.. seealso::
* :ref:`MPI_Op_create`
|
