celluloid.rb

require "celluloid"

class MyClass
  include Celluloid

  def initialize
    @a = 0
  end

  def do_something
    @a += 1
  end
end

pool = MyClass.pool
p Celluloid::Actor.all.count

f = []
25.times do |t|
  f << pool.future(:do_something)
end

# Here we redefine our pool, and it doubles the actor count
pool = MyClass.pool
p Celluloid::Actor.all.count

25.times do |t|
  f << pool.future(:do_something)
end

f.map(&:value)