Re: Quick "hopefully" question on JVM, RUNJVA, etc...

Thanks for the reply, Duane.

The performance issue isn't really for multiple jobs running the Java, just
one. But they run it over and over.

It's for adding an overlay/watermark to a PDF. That alone I know is
resource intensive. If you've ever seen the PDF spec, adding a single
character means changing almost the entire document, XREF, etc. Adding a
watermark I'm sure is very string intensive too.

What we're seeing is each time this is called, from the same job mind you, a
new little job spawns, then when it's done that job goes away. That's where
I thought the resources might be going. But personally I believe it's the
manipulation of the PDF file itself that's causing what seems to be a lot of
lag. It's just a lot of work!

I did show them how to recompile the JAR files on their system so hopefully
that will help. This is on V6R1 as well.

Brad

On Fri, Jun 25, 2010 at 3:14 PM, Christen, Duane
<Duane.Christen@xxxxxxxxxx>wrote:

Brad;

Once the a JVM is started in a job it runs until the job ends. If, for any
reason, the JVM ends you will not be able to restart a JVM in that job.

If this is not a batch job, then I would recommend using a NEP or some
such, as having a JVM started for multiple users will most likely be a
performance drag on your system.

Duane Christen


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Duane Christen
Senior Software Engineer
(319) 790-7162
Duane.Christen@xxxxxxxxxx

Visit PAETEC.COM


-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:
midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Bradley Stone
Sent: Friday, June 25, 2010 2:33 PM
To: MIDRANGE-L@xxxxxxxxxxxx
Subject: Re: Quick "hopefully" question on JVM, RUNJVA, etc...

Just curious if I should ask this on another list. I thought it was more
of a "system" type question than a Java or RPG program. Thanks! :)

Brad

On Thu, Jun 24, 2010 at 2:45 PM, Bradley Stone <bvstone@xxxxxxxxx> wrote:

I have a question that I hope isn't too hard to answer. I've seen
conflicting information on this, and am curious.

If I have an RPG program than runs a Java Class using the RUNJVA
command, does this or does it not start and stop the JVM each time
this is called causing a LOT of extra overhead, or does it start the
JVM the first time and end it when the job ends?

Now, lets assume I am calling the same class/method in an RPG program
instead of using RUNJVA... same question. Does this start and stop
the JVM each time, or just start it the first time, and end the JVM
when the job itself ends?

I want if all possible to stay away from using a NEP for this.

I think you'll see where I'm going with this... performance issues
with Java. :)

Brad

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