java.lang.OutOfMemoryError: PermGen space

[Mike Dippold <mi...@dippold.com>]

We are using tomcat 5.5.12 and every couple days the tomcat server goes down hard and the last line in the log is: 

java.lang.OutOfMemoryError: PermGen space 

It appears to only happen if we: 
Update jsp pages 
Reload Webapp 
Deploy Webapp 

If we do not do any of the following the server runs great with no problems which makes me wonder if it has to do with our application or tomcat.  We are planning on restarting tomcat each night for now, but we do not want to do that if we shouldnt have to. 

Please Advise. 

Thanks, 
Mike 
 
               

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Re: java.lang.OutOfMemoryError: PermGen space

[Stephen Caine <st...@commongrnd.com>]

Mike,

> We are using tomcat 5.5.12 and every couple days the tomcat server  
> goes down hard and the last line in the log is:
>
> java.lang.OutOfMemoryError: PermGen space
>
> It appears to only happen if we:
> Update jsp pages
> Reload Webapp
> Deploy Webapp
>
> If we do not do any of the following the server runs great with no  
> problems which makes me wonder if it has to do with our application  
> or tomcat.  We are planning on restarting tomcat each night for  
> now, but we do not want to do that if we shouldnt have to.

This is exactly the problem we kept experiencing, only ours was after  
4 -5 hours of heavy use.  We have a very large webapp with well over  
200 complex pages.  However, we were able to address this by using  
the following configuration:

-server -Xms2048m -Xmx2048m -XX:MaxPermSize=128m -XX:NewRatio=16

We have 3 gigabytes of RAM, but were were still getting out of memory  
errors.  The key setting, "-XX:NewRatio=16" was the trick.  This is  
the ratio allocation between 'perm' and 'eden' memory.  The default  
value is 8.  Raising this value gives more memory to the perm  
memory.  Also note, that raising the MaxPermSize to 128m helped for a  
while, but eventually we got an out of memory error.

We have struggled with correct allocations and continue to tweak our  
settings.  I  hope this is helpful.

Stephen Caine
CommonGround Softworks, Inc.

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