Lazy Resque

Move Resque enqueues out of the Rails request cycle to help decrease time to first byte.

Install

From gem:

gem 'lazy_resque'

From source:

gem 'lazy_resque', git: 'git@github.com:samuelgiles/lazy_resque.git'

Use

Trigger the actual enqueue of the jobs after the request in an after_action block, this can be done by including LazyResque::ControllerEnqueue which will automatically add the after_action for you.

class ApplicationController < ActionController::Base
  include LazyResque::ControllerEnqueue

  def index
    Resque.lazy_enqueue(MyResqueJob, 1234, 'some_job_data')
  end
end

Why?

Though moving a long running task to a Resque job is beneficial the actual enqueuing process isn't free:

• Any before_enqueue hooks are run
• A new job instance is initialized and validated
• Arguments are dumped/encoded into JSON
• Redis rpush takes places requiring communication with the Redis server

This is fine for 1-2 enqueues in a request cycle but can add up to a measurable amount of time if your enqueuing several jobs.

You don't lose anything by moving the actual enqueuing outside the request cycle and it saves precious milliseconds.