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Peter,

> 1. Does each tomcat instance use a separate 2 GB of memory, ie the 3
> instance use 6 GB between them ?

Each instance gets a separate, 2GB heap space.

> 2. or do they potentially share they same memory?

Since Java 1.5, "shared archive" capability is available on Sun's JVM.
This basically means that the core JVM stuff can be memory-mapped and
thus shared between processes, so you actually get a benefit when you
run multiple simultaneous JVMs.

See:
http://java.sun.com/j2se/1.5.0/docs/relnotes/features.html#vm_classdatashare
http://java.sun.com/j2se/1.5.0/docs/guide/vm/class-data-sharing.html

These pages cover this capability if you re interested in reading all
about it.

- -chris

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