Used in RubyConf Taiwan 2016 https://www.slideshare.net/shikendon/crawler-from-zero

ruby_thread_sidekiq_test.rb

# lib/tasks/benchmark.rake
namespace :benchmark do
  task run_sidekiq: :environment do
    batch = Sidekiq::Batch.new
    batch.on(:complete, TestWorker)

    batch.jobs do
      200.times do
        TestWorker.perform_async
      end
    end
  end
end

# app/workers/test_worker.rb
class TestWorker
  include Sidekiq::Worker

  def perform
    response = HTTParty.get("https://www.facebook.com/")
    doc = Nokogiri::HTML(response.body)
    title = doc.css("title").text
    ProjectLog.create!(title: title)
  ensure
    ActiveRecord::Base.clear_active_connections!
  end

  def on_complete(status, options)
    time_elapsed = Time.now.utc - status.created_at
    puts "Elapsed time: #{time_elapsed} seconds"
  ensure
    ActiveRecord::Base.clear_active_connections!
  end
end