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Integrates ruby-prof with RSpec, allowing you to easily profile your RSpec examples.
Ruby Gherkin
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Latest commit 9e01c8f Sep 7, 2016


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Integrates ruby-prof with RSpec, allowing you to easily profile your RSpec examples.


If you need to use rspec-prof in Rails 2.x or RSpec 1.x, use version `0.0.3`.


group :test do
  gem 'rspec-prof'


The easiest way to use rspec-prof is to export the `RSPEC_PROFILE` environment variable:

$ rake spec RSPEC_PROFILE=each

This will cause every spec to be profiled individually. The output will be placed in `./profiles` by default.

To execute all specs as parts of a single profile, export `RSPEC_PROFILE=all` instead.


You can set some configuration options for `rspec-prof`, as long as you do so before `RSpec` begins running specs. Thus, the best place for this configuration is in `spec/support/rspec-prof.rb`.

Valid configuration options and their default values are:

RSpecProf.printer_class = RubyProf::GraphHtmlPrinter
  # The printer to be used when writing profiles

RSpecProf::FilenameHelpers.file_extension = "html"
  # The file extension for profiles written to disk

RSpecProf::FilenameHelpers.output_dir = "profiles"
  # The destination directory into which profiles are written

Pausing and Resuming

It is perfectly OK to do this:

require 'spec_helper'

describe "smth" do
  before do
    # let's not profile the test set-up
    RubyProf.pause if RubyProf.running?

    sleep 30 # doing something expensive...

    # don't forget to resume so specs can be measured!
    RubyProf.resume if RubyProf.running?

Note on Patches/Pull Requests

  • Fork the project.

  • Make your feature addition or bug fix.

  • Add tests for it. This is important so I don't break it in a future version unintentionally.

  • Send me a pull request. Bonus points for topic branches.


Copyright © 2010 Colin MacKenzie IV. See LICENSE for details.

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