Re: Why does CRTJVAPGM take so long sometimes?

Hi Paul,

Let me say up front that I don't know the answer to your question, but...

A) If you're at 5.2 or greater (and I think there's a patch for 5.1 as well,) you don't need to use CRTJVAPGM. The runtime is that much better now (I've seen clues that even IBM's JVM uses HotSpot.)

B) Even if you're pre-5.2, I'm missing something - what's the point of CRTJVAPGM if Optimization... *INTERPRET" ???

If you are unfortunate enough to get past these, I believe there are some ways to include the attached program, but I'd have to dig pretty far back and I'd much prefer that you did. ;-)


Joe Sam

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----- Original Message ----- From: "Clapham, Paul" <pclapham@xxxxxxxxxxxxx>
To: "Java Programming on and around the iSeries / AS400" <java400-l@xxxxxxxxxxxx>
Sent: Tuesday, September 25, 2007 6:37 PM
Subject: Why does CRTJVAPGM take so long sometimes?

Hello all,

Here's my situation. I have a process (identical copies running on
several iSeries machines) that runs a list of Java tasks, and this
process has "hot deployment" built into it. What that means is this:
There is a reference directory where the jar file for the application
resides. To hot-deploy the application, I simply drop the new version of
the jar file into that directory.

When the process detects the new jar file, it stops each task and copies
the jar file into the task's classpath. Then it starts the task again.
(It's Java code doing this, it just copies the jar file in the obvious
way.) And in the stdout of the process I see a lot of lines that say
"Attaching Java program to...".

The problem is, on some machines this hot-deployment procedure takes a
ridiculously long time. At present the application is less than 200
classes and the jar file is about 300K. On one machine it takes about a
minute and a half to do this for each task, whereas on another machine
it takes less than 10 seconds. And when you multiply that by 50 or 100
tasks, you can't even call it lukewarm deployment.

When I use DSPJVAPGM to see what the procedure did, it says
"Optimization... *INTERPRET" so I don't believe I can ask for anything
less than that. So what can I look at to see why it takes so long?

Regards
Paul Clapham

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