While I know IronRuby isn't quite ready for the world to use it, I was wondering if anyone here tried it and tested how well it faired against the other Rubies out there in terms of raw performance?
If so, what are the results, and how did you go about measuring the performance (which benchmarks etc)?
Edit: The IronRuby team maintains a site on how they compare to Ruby MRI 1.8 at http://ironruby.info/. Below the spec pass rate table, they also have some information on how IronRuby performs on these specs. This table is not continuously updated, but I assume they update it often enough (you can see the last update at the top of the page).
According to this article http://www.iunknown.com/2008/05/ironruby-and-rails.html. In may performance was nowhere near where they expected it to be. I heard in http://altnetpodcast.com/episodes/9-state-of-ironruby (3 days ago) that they're still working on performance. I guess they put compatability first and are now trying to get the performance up to par with other ruby implementations out there.
As far as I understand they're not nearly as performant as Iron Python that is developed by the same team. I don't know if this is because Iron Ruby is using the DLR a lot more and that still needs to be optimized or if they need to optimize the Iron Ruby implementation itself more. But I guess it is good news because they can get it a lot faster. So if you're already happy with performance you'll get a lot happier.