How does jruby relate to truffleruby?
IIRC Truffle is dramatically faster in some benchmarks but slower in others. And there are some usability aspects of the language that are negatively impacted.
But TruffleRuby is something different. It is another Ruby implementation (just like JRuby is a Ruby implementation) using the Truffle framework. And Truffle framework requires to be run on GraalVM.