>> One of my interests in Squeak is to implement SMP support...

    How does GemStone Smalltalk do it?

Gemstone Smalltalk is single (OS) threaded. Multiple CPUs help
Gemstone by allowing each process (all the gems, the stone, the
distributed collector, the cache monitors) to run truly in parallel.

Gemstone Java uses native threads to implement the JVM. Most of the
details are proprietary, unfortunately. I am not sure where the
boundaries are.

-- 
Patrick Logan                 mailto:patrickl at gemstone.com
Voice 503-533-3365            Fax   503-629-8556
Gemstone Systems, Inc         http://www.gemstone.com