MFSYNC

Syntax:

>>-.---.-.----.--MFSYNC-"integer"---------><
   +-/-+ +-NO-+

Parameters:

integer

The synchronization value defines the maximum synchronization boundary on which items will by synchronized (based on their size):

2

will synchronize:

2 byte comp/comp-x/comp-5 sync
pic x(4) comp/comp-x/comp-5 sync
pic x(8) comp/comp-x/comp-5 sync

on boundary:

 2
 2
 2

4

will synchronize:

2 byte comp/comp-x/comp-5 sync
pic x(4) comp/comp-x/comp-5 sync
pic x(8) comp/comp-x/comp-5 sync

on boundary:

 2
 4
 4

8

will synchronize:

2 byte comp/comp-x/comp-5 sync
pic x(4) comp/comp-x/comp-5 sync
pic x(8) comp/comp-x/comp-5 sync

on boundary:

 2
 4
 8

Properties:

Default:	NOMFSYNC
Phase:	Syntax check
$SET:	Initial

Dependencies:

If MFSYNC is specified alone (that is, without a qualifier) the effect will be as if MFSYNC"4" was specified.

Comments:

Applying the MFSYNC directive on a compilation unit can improve code generation and execution speed considerably. However, applying MFSYNC to a program that was developed without consideration for the MFSYNC effect on Data Division and record layout could have a detrimental effect on the program’s semantics.