[68cat][memory] How much memory should I allocate and what should the settings be?

[esmithbss]

I am having a terrible time with NB performance right now.  While my
memory indicator in the memory bar shows 180.1/241.2MB, when I look at
my OS allocations, I see that NetBeans has 810mb Virtual Memory
Allocation and 387mb  Memory Reserved, and 28mb Shared Memory.

I'm using the native Ruby interpreter to run my application so this is
really the NetBeans IDE, my single project, and the debugger connections
to my application.  That's all that is running within this JVM as far as
I can tell.

Any hints on optimizing this?

Eric