Benchmark limit_fetch overhead in different scenarios

sidekiq_bench.rb

require 'benchmark'
require 'sidekiq/limit_fetch'
require 'sidekiq/cli'

total       = ARGV.shift || 50
concurrency = ARGV.shift || 1
limit       = ARGV.shift

total = total.to_i
limit &&= limit.to_i

class FastJob
  include Sidekiq::Worker
  sidekiq_options queue: :inline

  def perform(i)
    puts "job N#{i} is finished"
  end
end

class FinishJob
  include Sidekiq::Worker
  sidekiq_options queue: :inline

  def perform
    Process.kill 'INT', 0
  end
end

FinishJob.perform_async
total.times {|i| FastJob.perform_async total-i }
Sidekiq::Queue['inline'].limit = limit

Sidekiq::CLI.instance.tap do |cli|
  %w(validate! boot_system).each {|stub| cli.define_singleton_method(stub) {}}
  cli.parse ['-q inline', "-c #{concurrency}"]
  puts Benchmark.measure {
    begin
      cli.run
    rescue Exception
    end
  }
end