From: "John Lam (DLR)" <jflam@...>
Date: 2007-12-21T13:18:00+09:00
Subject: Re: best way to distribute?

Charles Oliver Nutter:
>
> Ruby 1.9, XRuby, IronRuby, Ruby.NET, and Rubinius run Ruby as compiled
> bytecodes all the time (ok, you could say a bytecode interpreter, but
> it's still a big step beyond walking an AST). JRuby includes a mixed
> interpred/compiled mode for execution by default along with "all
> interpreted" and "all compiled" modes. In fact, as far as I know, Ruby
> 1.8 is the only version that's "only" interpreted at this point...all
> other versions have compiled execution.

Actually, we've recently enabled an interpreted mode in IronRuby / DLR. We run interpreted by default until a method gets called multiple times, and then we compile. The exact heuristic hasn't been finalized yet, but we're forced to do this to do better on startup perf. The cost of JIT is rather expensive ...

-John