RE: Automatic Performance adjustment

[Vern Hamberg <vhamberg@xxxxxxxxxxxxxxxxxxxxxxxxx>]

John, if you're running WRKACTJOB, you're hitting the system quite hard. 
The interactive job probably has a bunch of internal objects in use. So 
getting the extra memory is what should happen.

IMHO

Vern

At 11:00 AM 3/3/2003 -0600, you wrote:
> I still see the performance adjuster doing odd things even at V5R1
> CUM2134.
>
> Example:  It's a Saturday and I'm doing some maintenance on our dev box
> (720).  I'm the only user signed on and I've submitted some big batch
> jobs.  While waiting for the batch jobs to finish, I'm occasionally
> hitting F10 on a WRKACTJOB and/or WRKSYSSTS display.  With the perf
> adjuster on, my activity will be allocated about 200MB of main storage
> with the remainder being split between *MACHINE & *BASE.  The box has
> 2GB total.  Page faulting in *MACHINE will be higher than in *BASE.  So
> I drop *INTERACT to 50MB but over time it moves it back up.
>
> There's no reason for a single interactive job that uses under 2% of the
> CPU load to be allocated 10% of main storage, especially when the
> program stack isn't really changing and I'm only refreshing the display
> every couple of minutes.
>
> I manually tune our production system, but leave the dev box at
> QPFRADJ=3 to see if the auto tuner improves as new PTFs/releases are
> loaded.
>
> - John