[Building Sakai] GC for Java 7

[Stephen Marquard]

We are using the new(ish) G1 collector with java 7:

 -XX:+UseG1GC -XX:MaxGCPauseMillis=3000

which works reasonably all, although it doesn't always stick to MaxGCPauseMillis. The worst case full GC pause we've seen is 50s (on a heap size of around 5G) though that is quite rare.

Regards
Stephen

________________________________________
From: sakai-dev-bounces at collab.sakaiproject.org [sakai-dev-bounces at collab.sakaiproject.org] on behalf of Sobieralski, Damian Michael [dsobiera at indiana.edu]
Sent: 09 September 2013 04:10 AM
To: sakai-dev at collab.sakaiproject.org
Subject: [Building Sakai] GC for Java 7

When we were running pre Java 7, it was determined these to be our JAVA_OPTS (in part) for GC.  We are noticing that lately (we are running Java 7) that GC seems to be functioning in a less than efficient way.

What we had for pre Java 7:

-Xmn2g -XX:+UseParNewGC -XX:+UseConcMarkSweepGC  -XX:+CMSParallelRemarkEnabled -XX:+ParallelRefProcEnabled -XX:ReservedCodeCacheSize=192m

A lot of these are black box incantations to me. Do these setting look optimal/useful for Java 7?

- Damian
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