I'd like to mention Celluloid here as well. Generally I prefer Erlang/Elixir, but in Ruby centered apps, Celluloid (especially run under the JVM with JRuby) sol

I'd like to mention Celluloid here as well. Generally I prefer Erlang/Elixir, but in Ruby centered apps, Celluloid (especially run under the JVM with JRuby) solves a lot of concurrency problems easily. > All other major implementations (including Akka) have cooperative scheduling, i.e. forbidding blocking code in actors. Erlang allows it. Curious as to what people's thoughts on Celluloid:IO are with respect to solving the problem of blocking code in actors. Celluloid:IO provides an event driven reactor that works in parallel with the actors. I haven't used it myself, but it seems an interesting approach.