37signals / action_profiler

Profile Rails requests on a live app — Read more

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Clobber redirect responses so they're also profilable.

jeremy (author)

Thu Feb 19 15:21:57 -0800 2009

action_profiler /

name	age	history message
MIT-LICENSE	Thu Jan 29 13:55:31 -0800 2009	Rename license file [jeremy]
README.rdoc	Thu Jan 29 13:54:18 -0800 2009	Add license [jeremy]
init.rb	Sat Feb 07 12:57:24 -0800 2009	Install a dummy action_profiler class method if... [jeremy]
lib/	Thu Feb 19 15:21:57 -0800 2009	Clobber redirect responses so they're also prof... [jeremy]

README.rdoc

Action Profiler

`gem install ruby-prof` then add ?profile=process_time to any URL to profile the page load and download a calltree file. Open it with kcachegrind.

Add an around_filter :action_profiler to ApplicationController:

  around_filter :action_profiler unless Rails.env.production?

Enable live profiling in production accessible to specific IP addresses:

  ALLOWED_IPS = ['127.0.0.1', '1.2.3.4']
  around_filter :action_profiler, :if =>
    lambda { |c| ALLOWED_IPS.include?(c.request.remote_ip) }

If you’re using Ruby Enterprise Edition or a patched Ruby 1.8, you can profile memory and object allocation also: ?profile=memory or allocations.

This plugin uses an around_filter to profile the controller action only. Rack::Profiler, part of rack-contrib, can profile the entire Rails request.