- Fast context switching.
- Update while running.
- GC per thread.
All these are related. And what do they all have in common? Is it any surprise that Ericsson has shown an interest in Multi-VM Java? What use cases could possibly exist for MVM? Of course, system-process level is nice for visibility to the OS, but adding the option for light-weight "green" processes for MVM would also be cool.
Side note 1: Java's GC generally is way more advanced than Erlang's, so far as I can tell. Java's also far ahead in some other categories, including raw performance.
Side note 2: Sharing simple data types in messages seems a lot more robust than trying to serialize objects generally.