[Deploying Sakai] JVM tuning changes for 1.5 > 1.6

[Yzelle, Sonette]

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Hi Stephen,

We are on Sakai 2.6.2, on production we are still using Java 1.5.
Locally I recently changed my Java to 1.6 and the I experienced Memory errors (OutOfMemory Permgen space).
I had to alter my JAVA_OPTS to prevent the memory error. (-Xms256m -Xmx1024m -XX:PermSize=64m -XX:MaxPermSize=1024m)

I was wondering why but now seeing your e-mail java 1.6 might be causing it?

Regards
Sonette

Sonette Yzelle
Analyst Developer
ICT
UNISA
South Africa
email: syzelle at unisa.ac.za


-----Original Message-----
From: production-bounces at collab.sakaiproject.org [mailto:production-bounces at collab.sakaiproject.org] On Behalf Of Stephen Marquard
Sent: 21 July 2010 10:19 AM
To: production at collab.sakaiproject.org
Subject: [Deploying Sakai] JVM tuning changes for 1.5 > 1.6

Hi all,

Though I fear to ask this question ... has anyone who has moved from running java 1.5 to 1.6 made specific changes to their JAVA_OPTS memory settings, and if so can share what and why?

We currently have:

-Xms5000m -Xmx5000m -Xmn1g -XX:MaxPermSize=512m -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:GCTimeRatio=19 -XX:SurvivorRatio=8 -XX:TargetSurvivorRatio=90
-XX:MaxTenuringThreshold=31 -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCTimeStamps

Our servers are Linux (SLES) with 8G RAM.

Cheers
Stephen





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