(Update: After some head scratching I finally got to an irb prompt and have written up instructions on that post on getting it all running on OS X. The announcement post doesn't really go into anything and I couldn't find a README.)
(Update 2: I ran a VERY flimsy benchmark from the Alioth shootout - the Fannkuch benchmark - on 1.8.7, 1.9.1, MacRuby and MagLev and get these results:
1.8.7 - 6.276s
1.9.1 - 3.539s
MagLev Alpha - 2.975s
MacRuby 0.5b2 - 4.649s
MacRuby 0.5b2 (compiled) - 2.901s
JRuby 1.4.0 (basic) - 5.579s
Take with a pinch of salt, etc. It's a single benchmark under less than scientific conditions.. I bet half of that JRuby figure, for example, is JRuby starting up the JVM ;-))
If they're going to tweak the VM to handle one specific use cases while ignoring others, then it's a not a Ruby VM.
I can't recall the last time I downloaded something in alpha or beta that wasn't open source.
The GemStone Virtual Machine and associated binary files and libraries
written by GemStone Systems, Inc. are governed by:
...making it about as interesting as pre-GPL'd Java. No thanks.