The answer is: It depends :-)

Depends on what your Java apps are doing and what JVM version they require or will work with.

V5R4 has a 32-Bit JVM, but you may not be using it.

Could also be a memory squeeze. We had a customer recently go from 4gb to 32gb on their existing 525 and that took away their bottlenecks.

Not much of an answer, but I would warn that just assuming going to V6R1 will help is a false assumption.

Richard Schoen
RJS Software Systems Inc.
Where Information Meets Innovation
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message: 10
date: Wed, 29 Jun 2011 13:16:12 -0700
from: "Wyatt, Chris (FGWA-IL)" <Chris.Wyatt@xxxxxxxx>
subject: Java performance...

Hello all,

We are running a java client/server app on the AS400/iSeries/System i/IBMi/Powerwhatevertheyrecallingitnow. (MAPICS/Infor ERP XA/whatevertheyrecallingitnow)

We're running the MAPICS client mostly from a MS Terminal Server next to the AS400. The TS is being accessed from a WAN basically all over the world.

With this setup, we have an absurd number of potential bottlenecks/slowdowns and etc. And we are having performance problems.

We're trying our best to drill into the performance problems in a systematic way but it's been difficult. But one of the things we've been looking at hard is the Java performance on the AS400.

Currently, we are at V5R4 of the OS. We've been told that upgrading to V6R1 will bring a large Java performance benefit.

My question: Have you found this to be the case?

Obviously, we'll be going to V6R1 eventually anyway. But it would be nice if we could look forward to Java performance improvement.

Part of the reason I'm asking is that IBM always says the *next* version of the OS has incredible Java performance. And then we're always underwhelmed.

Thank you.

PS: I'd love to hear any tips you may have on our situation.

Chris Wyatt
ERP Developer/Analyst
A Barry-Wehmiller Company

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