Sidekiq moved from Celluloid to Concurrent Ruby as well. https://github.com/mperham/sidekiq/issues/2583 https://github.com/mperham/sidekiq/issues/2583 http://w

Sidekiq moved from Celluloid to Concurrent Ruby as well. https://github.com/mperham/sidekiq/issues/2583 https://github.com/mperham/sidekiq/issues/2583 http://www.mikeperham.com/2015/10/14/optimizing-sidekiq/ http://www.mikeperham.com/2015/10/14/optimizing-sidekiq/ Celluloid uses 1 thread per actor.