Celluloid: Actor-based concurrent object framework for Ruby

Celluloid is great but not really maintained anymore.

You probably want to use https://github.com/ruby-concurrency/concurrent-ruby and inparticular if you are interested in the Actor model take a look at http://ruby-concurrency.github.io/concurrent-ruby/Concurrent... and https://github.com/ruby-concurrency/concurrent-ruby/blob/mas...

I don't really write Ruby much anymore professionally but this is what I have moved a lot of my Celluloid based personal projects to.

Sidekiq moved from Celluloid to Concurrent Ruby as well.

https://github.com/mperham/sidekiq/issues/2583 http://www.mikeperham.com/2015/10/14/optimizing-sidekiq/

Celluloid uses 1 thread per actor.