I'm wondering why Celluloid/Sidekiq is more efficient than just doing this, having one Thread per worker

create_work.rb

require 'json'
require 'redis'

redis = Redis.new

60.times do
  redis.rpush "queue", ["Kernel", "sleep", 1].to_json
end

do_work.rb

require 'json'
require 'redis'

ARGV[0].to_i.times.map do |n|
  Thread.new do
    redis = Redis.new
    while payload = redis.blpop("queue")
      queue, job = payload
      class_name, message, *args = JSON.parse(job)
      object = Object.const_get(class_name)
      puts "Thread #{n}: #{object}.#{message}(#{args.map(&:inspect).join(', ')})"
      object.send(message, *args)
    end
  end
end.each(&:join)