I'm interested in this too. I have a couple machines with 128GB of RAM
in each. I noticed the CentOS RPM I was using doesn't seem to let you
use more than 2GB of RAM per instance. I'd guess because it's 32bit.
Would it be better to have several 2GB instances as virtual machines
or a single massive instance? I have a 2GB instance on each physical
machine running now but they are completely inadequate as evictions
are a common problem.

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