[opencms-dev] Tomcat tuning for OpenCms running on Linux

[Sebastian Himberger]

Hi Claus,

you might try: http://wrapper.tanukisoftware.org/

The good thing: You can even initiate a VM restart via JMX or console
output. This way customers can import modules themself.

I have multiple OpenCms instances running on my server with this and it
works fine.

best regards,
Sebastian

Claus Priisholm schrieb:
> Hi
>
> Some suggest that on a server setting you set Xms == Xmx, 1G/2G seem 
> like plenty, unless you have a lot of sessions or using a lot space for 
> the flex cache. At least with tomcat 5 setting max perm size to 128M was 
> a good thing, not sure if tomcat 6 is better at managing perm space but 
> memory is cheap so why waste time on it :-)
> I don't think I have seen stack issues with the default setting (unless 
> doing some unintended loops in the code and then you never have enough 
> stack space anyway :-), but 1024K seems plenty.
>
> But one thing you may want to be on the lookout for... I have seen some 
> weird issues when running tomcat via jsvc (which is default on Ubuntu 
> and as of version 5 also on Debian). A long time ago I ran into the 
> problem on Ubuntu and decided to stick with Debian, but since Debian now 
> also is using jsvc per default, I've seen the issue pop on a couple of 
> installations.
> What happens is seemingly related to the nightly indexing. At some point 
> (after days or weeks of smooth sailing) the jsvc process uses 100% of 
> one cpu. Prior to that it seems that after the nightly index rebuild the 
> process will slowly increase its cpu usage (in one example at the rate 
> of appr. 1% per hour). Once it reaches 100% there will be a huge amount 
> of interrupted indexing threads in the jsvc /tomcat process. I have not 
> seen this happen when running tomcat directly rather than though jsvc, 
> but it is probably not conclusive evidence that the culprit is jsvc.
>
> best regards
> Claus
>
> Yves Glodt wrote:
>   
>> Hi,
>>
>> I run an OpenCms instance in Ubuntu on a 4GB-box, and I wonder how I can 
>> set up tomcat to best use the resources the box has.
>>
>> To override the conservative defaults, for now I did:
>>
>> JAVA_OPTS="-Xserver -Xss1024K -Xms1G -Xmx2G -XX:MaxPermSize=128M 
>> -XX:NewSize=512m"
>>
>> What do you think of these settings?
>>
>> best regards,
>> yves
>>
>>
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