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  • Subject: RE: AS/400 tuning question
  • From: "Shaw, David" <dshaw@xxxxxxxxxxx>
  • Date: Wed, 28 Jun 2000 14:20:26 -0400

Joe,

It's not a job, it's a system task, so CHGJOB and HLDJOB are not valid for
it.  Customers can see it, but we can't touch it through any normal means.

Dave Shaw
Spartan International, Inc.
Spartanburg, SC

> -----Original Message-----
> From: Joe Giusto [mailto:JGiusto@patuxent.com]
> 
> Is it possible to just put the CFINITxx job on hold?  Or 
> lower it's priority
> to a point that would not hog up the CPU as much?
> 
> Joe Giusto II
> Patuxent Publishing Company
> 10750 Little Patuxent Parkway
> Columbia, MD 21044
> mailto:JGiusto@patuxent.com <mailto:jgiusto@patuxent.com> 
> http://www.lifegoeson.com <http://lifegoeson.com> 
> 
> 
> -----Original Message-----
> From: KirkG@pacinfosys.com [SMTP:KirkG@pacinfosys.com]
> Sent: Sunday, June 25, 2000 11:00 AM
> To:   MIDRANGE-L@midrange.com
> Subject:      Re: AS/400 tuning question
> 
> IBM has not yielded on the server vs interactive. Once you 
> exceed your 
> interact quota the system will start a task/job called 
> CFINITxx, XX being 
> the CPU # if I remember correctly. This job(s) will take more 
> and more cpu 
> resource as the interactive work climbs. The penalty get 
> pretty stiff. I 
> don't remember the numbers but I'm sure some here has them 
> handy. Example 
> would be if your machine has 100 CPW and it's divided 80/20 
> server/interactive and your load was 0/40 the cpu would be maxed out 
> running at 100% with that CFINITxx hogging the system.
> 
> 
> 
> ---------------------------------
> Kirk Goins
> IBM Certified AS/400 Technical Solutions
> Pacific Information Systems - An IBM Premier Business Partner
> 503-290-2104              kirkg@pacinfosys.com
> "WE KNOW TECHNOLOGY"
> ---------------------------------
> 
> 
> 
> 
> 
> Pete Hall <pbhall@execpc.com>
> Sent by: owner-midrange-l@midrange.com
> 06/24/00 05:23 PM
> Please respond to MIDRANGE-L
> 
>  
>         To:     MIDRANGE-L@midrange.com
>         cc: 
>         Subject:        Re: AS/400 tuning question
> 
> At 17:00 06/24/2000 , Joe Teff wrote:
> >I have not done any real AS/400 tuning for a couple of years 
> and I've 
> never
> >tuned one of the server models. A friend asked me today if tuning a 
> server
> >model was any different than a regular model and I couldn't 
> answer him.
> >Other than looking for a blue stripe, I'm not sure if I could even 
> identify a
> >server model. I know that their is a governor of some type 
> that punishes
> >interactive jobs. Is that done with software in OS? Will it 
> stop you from
> >allocating more memory to certain subsystems or setting high 
> priorities 
> to
> >interactive jobs. TIA.
> 
> All I can tell you is that based on my recent experience with 
> tuning and 
> S30, and later a 730 (we upgraded the S30), there is no difference. I 
> watched IBM install the governor during the upgrade. At least 
> on a 730, I 
> don't think it has anything to do with interactive vs batch 
> load. It is a 
> hardware device that communicates with the CPU, and it determines the 
> processor feature code. Without it, the processor doesn't 
> function at all. 
> 
> My subjective impression is that there is definitely an 
> improvement in 
> throughput in batch as opposed to doing the same things 
> interactively, but 
> 
> I can't guess why this would be. I have never observed the 
> cycle gobbling 
> behavior that many complained about when the server models were first 
> introduced. My theory is that IBM yielded to customer pressure and no 
> longer enforces interactive limitations by running jobs that eat CPU 
> cycles. You can control memory pools and priorities on server 
> models just 
> as you can on any other AS/400.
+---
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