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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