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From Ethan Larson <et...@ethanlarson.net>
Subject Re: JSPWiki unstability under JDK 1.6?
Date Sun, 20 Jan 2008 17:37:00 GMT
Hi Janne,

Here are some GC settings that I'm using with JDK 1.6.  I'm not running 
JSPWiki with them, but I am running a heavily loaded java app with good 
stability.

-Xmn2g
-Xss1m
-XX:+UseConcMarkSweepGC
-XX:+UseParNewGC 
-XX:SurvivorRatio=8
-XX:TargetSurvivorRatio=90
-XX:MaxTenuringThreshold=15
-XX:+AggressiveOpts
-XX:+PrintGCDetails
-XX:+PrintGCTimeStamps
-XX:+UseBiasedLocking

HTH,
E

Janne Jalkanen wrote:
> Hi ho folks!
>
> I recently upgraded jspwiki.org to run under JDK 1.6.0_3, but 
> unfortunately that turned out to be a mistake: apparently there are 
> stability issues with it, since after that, the wiki engine became 
> unresponsive every six-to-twelve hours.  I have a script which pings 
> jspwiki.org every 20 minutes, and if it's not responding within 30 
> seconds, it kills and restarts the underlying process.
>
> Yesterday, I went back to 1.5.0_6, and the problems disappeared.
>
> This all is on Ubuntu 6.06, and no, I can't tell you what caused the 
> unresponsiveness.  The heap is pretty full, so this could be a GC 
> issue, but I ran both with and without -XX:ConcurrentGC, and there was 
> no difference.  jspwiki.org and ecyrd.com which are both running under 
> the same VM are both pretty heavily loaded (about 1 hit/second on each).
>
> Anybody have any similar experiences?
>
> /Janne

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