Re: Timeslices

["Alexei Pytel" <pytel@xxxxxxxxxx>]

It depends.
Sometimes, at some conditions, if activity level is too high, you can drive
paging level so high that disk drives will not be able to handle this load,
will become a bottleneck, and CPU use and job's progress can actually go
down.
One has to take into account other things as well - like jobs' working set
sizes, I/O activity, throughput of a DASD subsystem and many other...

    Alexei Pytel

"No one can beat unbeatable"





                    "Steve Richter"
                    <srichter@AutoCoder       To:     <midrange-l@midrange.com>
                    .com>                     cc:
                    Sent by:                  Subject:     Re: Timeslices
                    midrange-l-admin@mi
                    drange.com


                    08/31/2001 11:19 AM
                    Please respond to
                    midrange-l






-----Original Message-----
From: Clare Holtham <Clare.Holtham@btinternet.com>
To: midrange-l@midrange.com <midrange-l@midrange.com>
Date: Thursday, August 30, 2001 4:06 AM
Subject: Re: Timeslices


>For the activity level setting, again lower is usually better, but again
you
>can calculate the optimum value from Performance Tools data, using the
>QTRTSUM file and looking at the number of jobs that were in the activity
>level and the number that went ineligible. The way to do this is to plot a


Clare,

I disagree re setting the activitiy level. Setting it to a low value makes
likely the condition where jobs are ineligible even though there are cpu
resources available to run the job. The job mix changes during the day,
week
to week, etc. Forcing the activity level to a set value ignores these
fluctuations.

My solution is to set the interactive activity level high and the timeslice
very low.

Steve Richter



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