monitor memory usage of JVW

We've encountered several OutOfMemoryExceptions recently so we decided 
to increase the max heap size. First thing we noticed is that the WO 
app launch only gives you the possibility to manage the JVM settings on 
darwin. I did find a few posts on this subject in the archive, 
including one from David Teran saying that you can set these options in 
YourApp.woa/Contents/UNIX/UNIXClasspath.txt" (great place btw). So I 
uncommented and adjusted the corresponding line in this file to

JVMOptions       == "-Xmx128m -Xms32m"

The app starts up fine, but I would like to monitor the effect on the 
changes. What are my options to see what the settings of the JVM are 
and what my current usage is?

Thanks!

-Will