My bet is prepared to underwhelmed. I worked for a company a few years ago
that ran a java app on the iSeries. It was taking 20 minutes to run. They
moved it to a Tomcat server and it took twenty seconds. I know things are
better but I bet if you move to PC server it will be many times faster.
Unless you throw a huge amount of memory and processor at it you are just
not going to get the performance.

I don't really understand this. The iSeries should be a primer Java platform
but it never has been. I suspect it has to do with the job architecture but
I have never heard why iSeries is so weak on Java.

On Wed, Jun 29, 2011 at 2:16 PM, Wyatt, Chris (FGWA-IL) <
Chris.Wyatt@xxxxxxxx> wrote:

Hello all,

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

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

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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