If you and/or your third party software use a log facility (I think most 
software do) such as log4j you can turn on debug mode and inspect the 
log’s timestamp and see where the time goes

Easier said than done, especially for big systems. Also, as a rule, requires
some instrumentation to be included in the application being tested.
Otherwise, only servlet/enterprise bean-level information would be available
- personally, I find that insufficient. In any case, I certainly did not
mean that type of 3rd party software.


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-----Original Message-----
From: Bruce Jin [mailto:brucej@xxxxxxxxxxxxxxxxxxxx]
Sent: 17 October 2006 14:39
To: Java Programming on and around the iSeries / AS400
Subject: Re: Optimizing Native Java

If you and/or your third party software use a log facility (I think most 
software do) such as log4j you can turn on debug mode and inspect the 
log’s timestamp and see where the time goes


Raikov, Leonid wrote:
The most important thing is to understand where the time goes. Situations
when there are no bottlenecks and every class contributes to poor
performance in equal measure are pretty rare. What you need is to a)
understand what threads are primarily involved in productive work and then
b) draw a chart describing what each of these thereads is busy doing (e.g.
50% of the time spent waiting for JDBC queries and 50% of the time doing
processing). You can hardly achieve this without Java performance analysis
tools for System i. IBM Job Watcher is what immediately springs to mind,
JW data is not easy to analyse, to say the least. There are other tools,
some of them pretty good, but none of them in the Open Source domain, as
as I know.  

As for the magic button, there is none, I'm afraid. I would be suprised if
memory alone could make you happy. That is, unless you're running your JVM
in a 50MB pool.  

-----Original Message-----
From: albartell
To: 'Java Programming on and around the iSeries / AS400'
Sent: 10/16/06 4:12 PM
Subject: Optimizing Native Java

Hi All,
I am just completing a project where I wrote a Java proxy of sorts and
were a bunch of third party jar files involved in the mix. To make a
story short we are not satisfied with the performance we are getting out
the Java processes on the iSeries (note the Java is running in it's own
listening to a data queue - only one JVM startup).  We have run the
CRTJVAPGM against all .class and .jar files involved and are wondering
there any other mechanisms to look at concerning getting more speed on
Java end?
Obviously one solution would be to throw more memory at it, but is there
way to section off the memory so this Java process gets sole use of it
(similar to how you can do the same for Websphere Application Server)?
Any other idea's?
Aaron Bartell
New Tool! - RPG Chart Engine - visit www.mowyourlawn.com
<http://www.mowyourlawn.com/>  for more info.

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