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

[Dave Ross]

As a side note, our test environment is running the G1 collector. No
issues so far, but we haven't done much more than throw some
rudimentary load at it...

Prod we are still 1.5....

On Wed, Jul 28, 2010 at 3:22 PM, David Haines <dlhaines at umich.edu> wrote:
> 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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