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

[David Haines]

Can you characterize how big the variation is?  I'm wondering if the change is likely to be noticeable to the casual user.

Thanks - Dave

David Haines
CTools Developer
Digital Media Commons
University of Michigan 
dlhaines at umich.edu




On Jul 28, 2010, at 12:54 PM, Stephen Marquard wrote:

> 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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