Application memory use

[Michael Hall]

On Apr 23, 2012, at 4:28 AM, Henri Gomez wrote:

> 64bits Hotspot (6u23 and later) JVMs switch automatically to
> Compressed Pointers (-XX:+UseCompressedOops), saving memory.
> 
> http://docs.oracle.com/javase/7/docs/technotes/guides/vm/performance-enhancements-7.html

OK reading this I'm not sure there is much I can do in order to compare both running the same mode to see if this about all of the memory use difference. 
Since 32 bit isn't available in current builds compression is not possible?
Do you currently have any builds that still actually include the 32 bit in a universal build? 

For the Java 6 I'm assuming I'm also stuck with the default and can't change given...

> For JDK 6 before the 6u23 release, use the -XX:+UseCompressedOops flag with the java command to enable the feature.

Along with...
/usr/libexec/java_home -v 1.6 --exec java -version
java version "1.6.0_31"
Java(TM) SE Runtime Environment (build 1.6.0_31-b04-415-10M3635)
Java HotSpot(TM) 64-Bit Server VM (build 20.6-b01-415, mixed mode)

I'm assuming the 31 in 1.6.0_31 means > the 23 in 6u23? So forced to use the default there as well?