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FUCK SETI. Run specs with your spare CPU cycles.

Distribute your spec suite amongst your LAN via Bonjour.

  1. Spin up a manager on each machine that can run your specs.
  2. Start a dispatcher in your project directory.
  3. Say farewell to your long coffee breaks.


  • Bonjour or DNSSD (the capability and the gem)
  • Rsync (system command used)
  • Rspec (officially v1.3.0)


gem install specjour

Start a manager

Running specjour on the command-line will start a manager which advertises that it's ready to run specs. By default, the manager will use your system cores to determine the number of workers to use. Two cores equals two workers. If you only want to dedicate 1 core to running specs, use $ specjour --workers 1.

$ specjour

Setup the dispatcher

Require specjour's rake tasks in your project's Rakefile.

require 'specjour/tasks/specjour'

Distribute the specs

Run the rake task to distribute the specs among the managers you started.

$ rake specjour

Distribute the features

Run the rake task to distribute the features among the managers you started.

$ rake specjour:cucumber


Edit your config/environment.rb

config.gem 'specjour'

Each worker should run their specs in an isolated database. Modify the test database name in your config/database.yml to include the following environment variable (Influenced by parallel_tests):

  database: blog_test<%=ENV['TEST_ENV_NUMBER']%>

Each worker will attempt to clear its database tables before running any specs via DELETE FROM <table_name>;. Additionally, test databases will be created if they don't exist (i.e. CREATE DATABASE blog_test8 for the 8th worker) and will load your schema when it has fallen behind.

Only listen to supported projects

By default, a manager will listen to all projects trying to distribute specs over the network. Sometimes you'll only want a manager to respond to one specific spec suite. You can accomplish this with the --projects flags.

$ specjour --projects bizconf # only run specs for the bizconf project

You could also listen to multiple projects:

$ specjour --projects bizconf,workbeast # only run specs for the bizconf and workbeast projects

Customize what gets rsync'd

The standard rsync configuration file may be too broad for your project. If you find you're rsyncing gigs of extraneous data from your public directory, add an exclusion to your projects rsyncd.conf file.

$ vi workbeast/.specjour/rsyncd.conf

Use one machine

Distributed testing doesn't have to happen over multiple machines, just multiple processes. Specjour is an excellent candidiate for running 4 tests at once on one machine with 4 cores. Just run $ specjour in one window and $ rake specjour in another.


  • shayarnett - Cucumber support, pairing and other various patches
  • voxdolo - Endless support, alpha testing, various patches
  • leshill - Made rsync daemon configurable

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.
  • Commit, do not mess with rakefile, version, or history. (if you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull)
  • Send me a pull request. Bonus points for topic branches.


Copyright (c) 2010 Sandro Turriate. See MIT_LICENSE for details.

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