Re: Java performance...

In qshell (qsh) just type in java -version. Like so:

java -version

java version "1.5.0"
Java(TM) 2 Runtime Environment, Standard Edition (build jclap32dev-20091105)
IBM J9 VM (build 2.3, J2RE 1.5.0 IBM J9 2.3 OS/400 ppc-32 j9vmap3223sr11-2009
1106 (JIT enabled)
J9VM - 20091103_45935_bHdSMr
JIT - 20091016_1845_r8
GC - 20091026_AA)
JCL - 20091105


In this case this instance is running Java 5 32 bit ("ppc-32"). The 64 bit engine will come up as "classic" (I think). All of this can be manipulated on a system, job or even individual user ID basis by using depending upon which properties file or system variables are changed.

Pete Helgren
Value Added Software, Inc
www.asaap.com
www.opensource4i.com


On 7/9/2011 6:37 AM, Wyatt, Chris (FGWA-IL) wrote:

I'm have some technical ability on the AS400 but Java has always been a bit of a Black Box to me.

How can I tell which engine is being used? Is there something in qshell or is there another way?

Thank you!

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Charles Wilt
Sent: Wednesday, June 29, 2011 3:58 PM
To: Midrange Systems Technical Discussion
Subject: Re: Java performance...

v5r4 includes both the original 64-bit java engine and the newer 32-bit one...

Which one are you using?

If you don't need 64-bit, the 32-bit one performs much better.

Charles

On Wed, Jun 29, 2011 at 4:16 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
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
FleetwoodGoldcoWyard
A Barry-Wehmiller Company

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