Ruby threads and fibers testing

demo.rb

#!/usr/bin/env ruby
# frozen_string_literal: true

require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'

  gem 'async', '~> 2.2'
end

require 'async'
require 'async/scheduler'

class Tester
  TIMES = 100_000
  THREAD_COUNT = 3

  def self.test_one
    start = Time.now
    work.call
    puts "One run took #{Time.now - start}"
  end

  def self.test_threads
    threads = []
    start = Time.now
    THREAD_COUNT.times { threads << Thread.new { work.call } }
    threads.map(&:join)
    puts "#{THREAD_COUNT} threads running took #{Time.now - start}"
  end

  def self.test_async
    start = Time.now
    THREAD_COUNT.times do
      Async { work.call }
    end
    puts "#{THREAD_COUNT} jobs running via Async took #{Time.now - start}"
  end

  def self.test_async_scheduler
    Fiber.set_scheduler(Async::Scheduler.new)
    start = Time.now
    Fiber.schedule do
      THREAD_COUNT.times do
        Fiber.schedule { work.call }
      end
    end
    puts "#{THREAD_COUNT} jobs running via Async::Scheduler took #{Time.now - start}"
  end

  private

  def self.work
    @@work ||= -> { ::Tester::TIMES.times { 11 / 48 } }
  end

  if $PROGRAM_NAME == __FILE__
    test_one
    test_threads
    test_async
    test_async_scheduler
  end
end