For some reason I had problems downloading the Liberty Profile 9 beta getting 404 not found responses. This link sent to me by a colleague worked. Not sure why but if you're having trouble downloading the beta follow the link.
WebSphere Peformance - Alexandre Polozoff's Point of View
polozoff 110000N2A2 8,105 Views
As applications grow over time they tend to add features and functions and then one day they run out of native heap as more and more Java classes are piled in.
Edit: Oct 30, 2015 and Nov 17, 2015
Native OOM (NOOM) landscape continues to shift. An argument to offset the heap to a different area in the address space is much better (-Xgc:preferredHeapBase). With this new argument, one can place the Java heap allocated past the initial 4g of address space, allowing all native code to use almost all of the lower 4g of space.