Anyone using 3.5.1 with large JVMs? Thoughts?

Hello all,
I'm very interested in the possibilities with large sized storage nodes. We've been running 3.4.1 for about a year or so, with 2.5GB JVMs and rock solid performance after some careful GC tuning. What I've observed is that the app needs ~800MB of the heap for itself, leaving 1.7GB for storage. We're running 24 nodes, with that costing us 19GB of potential storage space (800 * 24). If we could run, for example, 1 node (fictitious example) with a 60GB JVM, using 800MB for the application, we end up with ~60GB of storage space vs. ~40GB. That's a lot more room :)
Obviously, GC tuning is going to be different with a JVM of this size.
Has anyone had any experience with large JVMs? What OS? What GC params did you use?
I'll be doing some testing in the next few weeks and will post back results, but wanted to see what kinds of results others were having.
Thanks for your time.
chris

Hi Chris
May first observation about 3.5 is increased memory overhead for distributed cache scheme.
On 32 bit JVM, Coherence 3.4 overhead per entry is about 116 bytes per entry and 3.5 overhead is 164 bytes per entry (in both cases it is a lower bound).
I'm working with large number of quite small objects ~80 bytes (using POF), for me additional 48 bytes are very sensitive.
I believe it is a trade off to speed up partition migration process.
Unfortunately I cannot say anything about perforce, I didn't test it.
I'm looking for results of your tests.
Regards,
Alexey

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