[Building Sakai] Fwd: [Deploying Sakai] JVM tuning changes for 1.5 > 1.6

[Stephen Marquard]

Sending this to a wider audience (initially on production list) in search of experience from anyone using Java 1.6 in production.

Our production experience under full load so far seems to show significantly higher variation in page request times than with java 1.5, though average performance doesn't seem worse, which suggests different GC behaviour.

Regards
Stephen 
 
>>> "Stephen Marquard" <stephen.marquard at uct.ac.za> 7/21/2010 10:18 AM >>> 
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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