Re: Running java on Iseries

Hi Aaron,
Yes...that's also my experience with Java on iSeries.....start a java program 
autojob which is listening to a dtaq and let rpg and clp communicate to java 
via dtaq. Do not start the JVM for each users job.
Regards,
Magne

-----Original Message-----
From: albartell [mailto:albartell@xxxxxxxxx]
Sent: Tuesday, October 3, 2006 10:41 PM
To: ''Java Programming on and around the iSeries / AS400''
Subject: RE: Running java on Iseries

Good points Franco. The main area's I have found problems is when I try to
start up the JVM for each users job, or rather, OS/400 starts up a JVM for
each user before they access the Java code being called. It would be great
if users could share a named JVM, but I am sure there would be complications
there also. It would almost be like the OS/400 folks having to rewrite a
servlet engine JVM for the native side of things.

The way around this is to have your RPG (or what have you) talk to the Java
via data queues. This makes it so the Java is only running in one batch job
(emphasis on batch) and the JVM startup is only incurred once. I have an
article coming out in the next week in ibmsystemsmag.com that gives example
of this approach through some open source code I wrote.

HTH,
Aaron Bartell
http://mowyourlawn.com



-----Original Message-----
From: java400-l-bounces@xxxxxxxxxxxx [mailto:java400-l-bounces@xxxxxxxxxxxx]
On Behalf Of Franco Biaggi
Sent: Tuesday, October 03, 2006 3:09 PM
To: Java Programming on and around the iSeries / AS400
Subject: Re: Running java on Iseries

Hello,
sorry for my bad English, just my opinion,
32 year of IBM systems knowledge, seem all the systems in each range, java
on OS/400 is very bad, we are running a lot of applications on it, I have a
lproblems with memory, GC, swap, etc.performace problems, even running on
V5R3, The performance is (not)comparable to a win-box -> 1:10 on linux-box
1:12 look at the GC (garbagec collector) is taking a lot of time, even no
swapping (think) involved.
Place a little PC connected (no changes required) and it works maybe 1:100
faster.

Ciao (make problems ?)
Franco
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