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> Admittedly, I wasn't thinking about browser based JITs when I said that :)

Don't HotSpot and JRockit also do background (de)compilation & swapping of generated code?

Yes, but in hotspot's case I cannot remember if it is actually turned on in both "server" and "client"

Aren't server and client not now merged with tiered compilation in Hotspot?

No, AFAIK. "Tiered compilation, introduced in Java SE 7, brings client startup speeds to the server VM. ... Tiered compilation is now the default mode for the server VM. "

Again, AFAIK, the server VM still has a significantly different set of tuning than the client VM. In particular, it runs some significantly more complex opts that the client VM does not.

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