[simonmales]

Puma says it runs best when using Rubinius or JRuby, but from my limited understanding, not everything can run on those implementations.

Are there any giveaways in the blog that wouldn't allow Raptor to run on Rubinius or JRuby?

[steveklabnik]

That's basically because Puma uses threads, and threads are way better on Rubinius and JRuby, due to lack of a GIL. It's not due to some kind of incompatibility.

[riffraff]

well if part of it is written in C++ it most likely won't run easily on either?