delayed_job benchmarks with multiple workers

benchmarks_multi.rb

require 'spec/spec_helper'
require 'logger'
require 'benchmark'

workers = 4
puts "#{workers} workers"

Benchmark.bm(10) do |x|
  Delayed::Job.delete_all
  (1000...10001).step(500).each do |n|
    n.times { "foo".delay.length }

    x.report("#{n} jobs") do
      Delayed::Worker.backend.before_fork
      workers.times do
        fork do
          Delayed::Worker.backend.after_fork
          Delayed::Worker.new(:quiet => true).work_off(n)
        end
      end
      Process.waitall
    end
  end
end