Hi All,

- Version: 5.5 but would upgrading to 6 be wise?
- OS: Cent OS
- Kind of App: Webapp with MySQL DB. Have you guys heard of Appfuse.
- We created it using Spring and Webwork
- I'm comparing my current performance to the performance when its deployed only on my devt desktop because it is so much slower now thinking the that it has a good upstream bandwidth allocation and a decent box to run on (dual core xenon and 4g ram).
- I definitely would like to improve page loading time and page throughput.

Regards,
Richard

Alan Chaney wrote:
Permgen space is used by the ClassLoader to hold copies of classes. It is unlikely that increasing the permgen space will produce a noticeable improvement in performance. Versions of tomcat can exhibit problems with java.lang.OutOfMemoryError: PermGen space failure - there is a good article here discussing some of the issues.
http://www.jroller.com/agileanswers/entry/preventing_java_s_java_lang

I had problems with tomcat 5.5 following reloading of web apps which were largely overcome by increasing the perm gen space and being prepared to restart the JVM occasionally. So far, I've had no problems with Tomcat 6, but then I have also changed a number of other factors. However, I reiterate that this won't affect the performance of a running application - it will either run or you will get a OOM error.

I still think that it would be helpful for Richard to explain exactly what aspect of performance he is trying to improve. Deployment? Startup? Page Response Time? Page Throughput? Memory Footprint?

Regards

Alan Chaney


Schadler Johann wrote:
Richard Reyes wrote:
I have not had the chance to try the heap size and class reloading thing, but would still like to learn on other might be areas of improvements.

To be able to influence the memory consumption (e.g. to tune the
PermGen-Space) is the main criteria and most efficient way to speed up your
application.
Johann

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