RE: Why separate pools?

[qsrvbas@xxxxxxxxxxxx (Tom Liotta)]

midrange-l-request@xxxxxxxxxxxx wrote:

>   3. Re: Why separate pools? (rob@xxxxxxxxx)
>
>How does the separate pools help memory management?  If I am using
>something like QPFRADJ to shift memory around automatically, how does
>having it in separate pools help memory management?

Rob:

Since there haven't been many significant answers to what I've thought your 
question really was ("Why not just use one big, shared pool with all spare 
memory in it and never worry about moving between pools automatically since the 
memory is already going to be in that pool? This probably assumes that the 
basic interactive/batch/spool/machine separation is already done."), I began a 
couple attempts at giving what I thought the answer should be.

But then I thought "Nobody cares."

In general, even sites where I've seen multiple shared pools allocated, 
performance adjustment active, etc., most really only pay lip-service. Most 
still end up running perhaps the majority of their active jobs in a single pool 
anyway -- *BASE. Most never consider that all of IBM's default routing entries 
and prestart job entries all route to *BASE.

With every host server and TCP/IP server job, as well as the subsystem monitors 
and various machine functions and possibly QTSEPOOL jobs as well, running all 
over *BASE, I guess pretty much nobody knows a good answer to your question. At 
least, the vast majority of configurations indicate that.

So, there's apparently no good reason not to just put it all in *BASE.

Tom Liotta

-- 
Tom Liotta
The PowerTech Group, Inc.
19426 68th Avenue South
Kent, WA 98032
Phone  253-872-7788 x313
Fax    253-872-7904
http://www.powertech.com


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