Note:
If you use various things like RMI and CMS GC and don't set one or two
key properties you'll always have a perm gen leak.
It's a nice feature of CMS :-)
On 5/21/2013 10:44 AM, Christopher Schultz wrote:
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Fachhoch,
On 5/21/13 10:53 AM, fachhoch wrote:
My application running on tomcat ,every day I see an increase in
permgen space
What was PermGen usage after your webapp reached a steady-state
(usually a few minutes after launch)? How much does it grow every day?
Have you ever run out of PermGen or are you just concerned that you
/might/ run out?
does this ever garbage collected?
Yes.
how can I see whats in the permgen space?
Use a memory profiler.
I guess Heap dump shows whats in the heap memory, how about
permgen space , I want to know why its increasing everyday?
I believe heap dump does give you PermGen info, but the "mat" tool
might not be great for visualizing it.
Tomcat 6.35 jdk 1.6
Note# I am not redeploying any application in tomcat and I just
have my app and not even the manager app.I always restart the
server if I have to redeploy my app.
That is good information to have. Do you do anything with RMI or use a
lot of proxy classes or anything like that? PermGen is mostly filled
with java.lang.Class objects. The more classes you have loaded, the
more PermGen you need. If you generate lots of on-the-fly Class
objects and their instances don't get collected, then the
java.lang.Class objects stick around forever and fill-up your PermGen.
- -chris
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