[Building Sakai] GC for Java 7

[Sobieralski, Damian Michael]

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