Nope, it is a deployment of the ruby version we use on .com.
Got it. What's the overhead of using RubyEncoder or some sort of code obfuscation/loader protection technology? I'm interested to know how much it costs compared to straight up MRI/JRuby.
It used to use RubyEncoder, now it uses something custom. The overhead is very minimal, and it's only when the source is read off disk.
Has it used JRuby in prior versions of Enterprise (or FI)?
FI was JRuby; as part of the naming switchover and product overhaul to the first release of GitHub Enterprise, we switched it over to MRI in late 2011.