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  3. November 2003

RE: How Memory Pools work




Can someone explain how memory pools work?

My experience has been that if you want something to run faster and with less interference from other jobs then you run it in a dedicated pool of memory. I would recommend that you try an experiment: put your troublesome job in a pool of memory all by itself and see if it runs better. It probably will. The pool probably doesn't have to be bigger than 5 megabytes, maybe even a lot less.

The iSeries memory sharing code is good but not perfect. Some jobs coexist in a memory pool better than others. Some are memory pigs: The RPG compiler. Index builds over a large file. Sorting.

The mother of all shared pools *BASE can usually get by with less than 10 megabytes of memory if all user work is removed from it and put into separate pools of memory. Yes, it is more difficult to manage additional pools of memory. I believe that leaving a large amount of memory in *BASE and letting everyone fight over it is not a good idea.

-- Charly

Charly Jones
Gig Harbor WA
253 265-6244




-----Original Message-----
From: Adam Lang [mailto:aalang@xxxxxxxxxxxxxxxxxxxx]
Subject: How Memory Pools work

Can someone explain how memory pools work?  Our system currently has 256 MB
total and apparently our interactive is around 150-160.  We also have a
machine, base and spool pool.

We have a windows based app that is using Communication Frameworks to call a
program on our AS/400 to rate auto insurance policies. It is taking a long
time to get an exit back from the as/400 program. The vendor is saying it
is because we have no batch pool and that it is processing in the base pool
and trying to pull memory form qinter (interactive). I would appreciate if
some of you more knowledgeable folks could give a high and low over view of
high memory pools work on the as/400. I hate having to take a vendor's word
for it. ;)

Adam Lang
Systems Engineer
Rutgers Casualty Insurance Company
http://www.rutgersinsurance.com



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