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Middleware that displays speed badge for every html page. Designed to work both in production and in development.

Using rack-mini-profiler in your app

Install/add to Gemfile

gem 'rack-mini-profiler'

Using Rails:

All you have to do is include the Gem and you're good to go in development.

rack-mini-profiler is designed with production profiling in mind. To enable that just run Rack::MiniProfiler.authorize_request once you know a request is allowed to profile.

Using Rails:

# A hook in your ApplicationController
def authorize
  if current_user.is_admin? 

Using Builder:

require 'rack-mini-profiler'
builder = Rack::Builder.new do
  use Rack::MiniProfiler

  map('/')    { run get }

Using Sinatra:

require 'rack-mini-profiler'
class MyApp < Sinatra::Base
  use Rack::MiniProfiler

Database profiling

Currently supports Mysql2, Postgres, and Mongoid3 (with fallback support to ActiveRecord)


rack-mini-profiler stores it's results so they can be shared later and aren't lost at the end of the request.

There are 4 storage options: MemoryStore, RedisStore, MemcacheStore, and FileStore.

FileStore is the default in Rails environments and will write files to tmp/miniprofiler/*. MemoryStore is the default otherwise.

To change the default you can create a file in config/initializers/mini_profiler.rb

# set MemoryStore
Rack::MiniProfiler.config.storage = Rack::MiniProfiler::MemoryStore

# set RedisStore
if Rails.env.production?
  uri = URI.parse(ENV["REDIS_SERVER_URL"])
  Rack::MiniProfiler.config.storage_options = { :host => uri.host, :port => uri.port, :password => uri.password }
  Rack::MiniProfiler.config.storage = Rack::MiniProfiler::RedisStore

MemoryStore stores results in a processes heap - something that does not work well in a multi process environment. FileStore stores results in the file system - something that may not work well in a multi machine environment. RedisStore/MemcacheStore work in multi process and multi machine environments (RedisStore only saves results for up to 24 hours so it won't continue to fill up Redis).

Additionally you may implement an AbstractStore for your own provider.

Running the Specs

$ rake build
$ rake spec

Additionally you can also run autotest if you like.

Configuration Options

You can set configuration options using the configuration accessor on Rack::MiniProfiler:

# Have Mini Profiler show up on the right
Rack::MiniProfiler.config.position = 'right'

In a Rails app, this can be done conveniently in an initializer such as config/initializers/mini_profiler.rb.

Rails 2.X support

To get MiniProfiler working with Rails 2.3.X you need to do the initialization manually as well as monkey patch away an incompatibility between activesupport and json_pure.

Add the following code to your environment.rb (or just in a specific environment such as development.rb) for initialization and configuration of MiniProfiler.

# configure and initialize MiniProfiler
require 'rack-mini-profiler'
c = ::Rack::MiniProfiler.config
c.pre_authorize_cb = lambda { |env|
  Rails.env.development? || Rails.env.production?
tmp = Rails.root.to_s + "/tmp/miniprofiler"
FileUtils.mkdir_p(tmp) unless File.exists?(tmp)
c.storage_options = {:path => tmp}
c.storage = ::Rack::MiniProfiler::FileStore
::Rack::MiniProfiler.profile_method(ActionController::Base, :process) {|action| "Executing action: #{action}"}
::Rack::MiniProfiler.profile_method(ActionView::Template, :render) {|x,y| "Rendering: #{@virtual_path}"}

# monkey patch away an activesupport and json_pure incompatability
# http://pivotallabs.com/users/alex/blog/articles/1332-monkey-patch-of-the-day-activesupport-vs-json-pure-vs-ruby-1-8
if JSON.const_defined?(:Pure)
  class JSON::Pure::Generator::State
    include ActiveSupport::CoreExtensions::Hash::Except

Available Options

  • pre_authorize_cb - A lambda callback you can set to determine whether or not mini_profiler should be visible on a given request. Default in a Rails environment is only on in development mode. If in a Rack app, the default is always on.
  • position - Can either be 'right' or 'left'. Default is 'left'.
  • skip_schema_queries - Whether or not you want to log the queries about the schema of your tables. Default is 'false', 'true' in rails development.
  • auto_inject (default true) - when false the miniprofiler script is not injected in the page
  • backtrace_filter - a regex you can use to filter out unwanted lines from the backtraces

Special query strings

If you include the query string pp=help at the end of your request you will see the various option you have. You can use these options to extend or contract the amount of diagnostics rack-mini-profiler gathers.