Re: Named indicators (was DOW vs DOU)

[cmassoglia@xxxxxxxxxxx (Charlie Massoglia)]

>Neil Palmer wrote:
>
>Not that you would have a block of indicators in nicely structured code,
>but again with MOVEA for setting on/off blocks of indicators aren't you
>sacrificing readability and making it harder to scan/spot indicators
>used in the source ?  If I remember correctly, they don't even show up
>in the cross reference listing when you compile the program.
>--
The only time I would turn of a block of indicators is when they are used in
a display file.  A better alternative might be to make them response
indicators so they are turned off automatically when the display file is
read in.
 
>Charlie Massoglia wrote:
>> 
>> James Kilgore wrote:
>> 
>> >BTW I have never understood the expensive use of MOVEA to turn
>> >indicators off or on when you can't get any clearer then an explicit
>> >SETOF or SETON.  In an earlier post abount scanning for indicator
>> >useage, you would never find the indicators being turned off/on with a
>> >MOVEA.
>> >
>> Have you ever run a performance comparison on multiple SETOFs versus a
>> single MOVEA?  A test in RPG IV setting off a block of indicators 50,000
>> times resulted in the following times:
>> 
>> SETOF 20,21,22  SETOFF 23,24,25 .......    16 seconds
>> MOVE *OFF *IN20, MOVE *OFF *IN20.......    16 seconds
>> EVAL *IN20 = *OFF, EVAL *IN21 = *OFF...    16 seconds
>> MOVEA OFF20 (named constant) *IN,20....     9 seconds
>> 
>> The MOVEA is the most efficient method to turn off a block of indicators.
>> Of course my first test of 500 times and my second test of 5,000 times were
>> not enough to detect the difference.


Charlie Massoglia, Massoglia Technical Consulting, Inc.
PO Box 1065, Okemos, MI 48854, USA
517-676-9700  Fax: 517-676-1006  EMAIL: cmassoglia@voyager.net


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