[opencms] [opencms-dev] Optimizing OpenCMS performance.

[Nigel Kersten]

On 16/06/2006, at 9:24 PM, <justin.spies at sbcglobal.net>  
<justin.spies at sbcglobal.net> wrote:

> Having such a large VM configured can cause garbage collection  
> issues, which lead to performance problems.  I'm not sure that is  
> the problem here, however to find out, you can use the following VM  
> options:
>
> -verbose:gc -XX:+PrintGCTimeStamps -XX:+PrintGCDetails -Xloggc:"C: 
> \garbage.log"
>
>
> Obviously you'll want to change the -Xloggc: value to a file that  
> matches one on your file system.  With as large of a VM as you  
> have, it is possible that the system is causing long pauses to  
> collect a large amount of garbage objects.  Look for entries where  
> the system does a full garbage collection and note how long they  
> take and how far apart they are spaced.

Thank you very much Justin.

I had come across mention of this, but also that garbage collection  
issues like this shouldn't be a problem with Tomcat 5.5 and Java 1.5,  
does that seem right to you?

I did test with a wide range of max values, and this cpu usage issue  
cropped up irrespective of those settings.

Thanks for the debug info, I'll grab that.

-- 
Nigel Kersten [Senior Technical Officer]
College of Fine Arts, University of NSW, Australia.
CRICOS Provider Code: 00098G