Doesn't that also use a JIT? Why are you comparing benchmarks versus PUC Lua instead of versus LuaJIT??
YARV? No.
YARV is the current official Ruby interpreter - it replaced MRI in this role from Ruby 1.9 onwards.
(http://www.atdot.net/yarv/rc2006_sasada_yarv_on_rails.pdf page 15)