Collects profiles of RSpec test suites, enabling you to identify specs with interesting attributes. For example, find the slowest specs, or the spec which issues the most queries.

Collected attributes include:

  • git commit SHA (or SVN revision) and date
  • example file, line number and description
  • example status (i.e. passed or failed)
  • example exception (i.e. nil if passed, reason for failure otherwise)
  • example time
  • query count and time
  • request count and time


RspecProfiling should work with Rails >= 3.2 and RSpec >= 2.14.


Add this line to your application's Gemfile:

gem 'rspec_profiling'

And then execute:


Require the gem to your spec_helper.rb.

require "rspec_profiling/rspec"

Lastly, run the installation rake tasks to initialize an empty database in which results will be collected.

bundle exec rake rspec_profiling:install


Choose a version control system

Results are collected based on the version control system employed e.g. revision or commit SHA for svn and git respectively.


By default, RspecProfiling expects Git as the version control system.


RspecProfiling can be configured to use svn in config/initializers/rspec_profiling.rb:

RspecProfiling.configure do |config|
  config.vcs = RspecProfiling::VCS::Svn

Git / Subversion

For those with a mixed project, with some developers using git svn and others regular svn, use this configuration to detect which is being used locally and behave accordingly.

RspecProfiling.configure do |config|
  config.vcs = RspecProfiling::VCS::GitSvn

Choose a results collector

Results are collected just by running the specs.


By default, profiles are collected in an SQL database. Make sure you've run the installation rake task before attempting.

You can review results by running the RspecProfiling console. The console has a preloaded results variable.

bundle exec rake rspec_profiling:console

> results.count
=> 1970

You can find the spec that runs the most queries:

> results.order(:query_count).last.to_s
=> "Updating my account - ./spec/features/account_spec.rb:15"

Or find the spec that takes the most time:

> results.order(:time).last.to_s
=> "Updating my account - ./spec/features/account_spec.rb:15"

There are additional attributes available on the Result instances to enable debugging, such as exception and status.


You can configure RspecProfiling to collect results in a CSV in config/initializers/rspec_profiling.rb:

RspecProfiling.configure do |config|
  config.collector = RspecProfiling::Collectors::CSV

By default, the CSV is output to cat tmp/spec_benchmarks.csv. Rerunning spec will overwrite the file. You can customize the CSV path to, for example, include the sample time.

RspecProfiling.configure do |config|
  config.collector = RspecProfiling::Collectors::CSV
  config.csv_path = ->{ "tmp/spec_benchmark_#{}" }


You can configure RspecProfiling to collect results in a Postgres database in your spec_helper.rb file.

RspecProfiling.configure do |config|
  config.collector = RspecProfiling::Collectors::PSQL
  config.db_path   = 'profiling'

Configuration Options

Configuration is performed like this:

RspecProfiling.configure do |config|
  config.<option> = <something>


  • db_path - the location of the SQLite database file
  • table_name - the database table name in which results are stored
  • csv_path - the directory in which CSV files are dumped
  • collector - collector to use

Usage in a script

If you want to access the results from a Ruby script instead of the rake rspec_profiling:console shell command:

require 'rspec_profiling'
require 'rspec_profiling/console'

Then results will be available as a variable to the script.


To remove the results database, run bundle exec rake rspec_profiling:uninstall.


  1. Fork it
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request

About Breakwater

Breakwater Logo

Breakwater builds exciting web and mobile apps in Louisville, CO. Our work powers a wide variety of businesses with many different needs. We love open source software, and we're proud to contribute where we can. Interested to learn more? Contact us today.

This project is maintained by Breakwater. The names and logos of Breakwater are fully owned and copyright Breakwater Limited.