Rails, Minitest and Guard - Why is rb-fsevent taking up over 100% CPU?

guard, minitest, ruby, ruby-on-rails

Solution

SOLUTION:

I resolved it, by adding an 'ignore' statement to my Guardfile. For my rails 3 project it looked like this (./Guardfile):

ignore([%r{^bin/*}, %r{^config/*}, %r{^db/*}, %r{^lib/*}, %r{^log/*}, %r{^public/*}, %r{^tmp/*}])

guard 'rspec', cmd: 'spring rspec', all_after_pass: false, all_on_start: false, focus_on_failed: true do
  # Rails
  watch(%r{^spec/.+_spec\.rb$})
  ...
end

It seems, that this is best practice for guard/rspec/rails.

Guard 'ignore' infos: https://github.com/guard/guard/wiki/Guardfile-DSL---Configuring-Guard#ignore

MY PROBLEM

I was experiencing something quite similar on my mac os x 10.9 machine using:

- spring (1.0.0)

- rb-fsevent (0.9.3)

- growl (1.0.3)

- rspec-core (2.14.7)

- rspec-expectations (2.14.4)

- rspec-mocks (2.14.4)

- rspec (2.14.1)

- guard-rspec (4.2.0)

- listen (2.4.0)

- rspec-rails (2.14.0)

- rails (3.2.15)

after starting guard to run my rspec tests, the guard process jumped to 100% load on one core while "idling", it stayed like this long enough for me to qualify as "forever". :)

I tried to run guard

- with forced polling

- with no 'watch' statements

- with spring

- without spring

No change.

My colleague works on linux on the same project, so he uses rb-inotify instead of rb-fsevent. He's got no load while idling (as you would expect for mac os too...).

As written above, my solution was to add an 'ignore' statement to my Guardfile.

Problem

I'm running guard in my Rails app and the test suite (minutest) has recently stopped working properly. If I'm lucky, it'll run all of the tests once, maybe twice. After that, it takes so long to respond to even one small test file being changed that using the gem becomes futile. When following `top` while the tests run, I can see there's a ruby process that's taking up over 100% of the CPU constantly. Even once all tests are run and I haven't made any changes to the file. The ruby process is: ``` /Users/Bodacious/.rvm/gems/ruby-2.0.0-p247@MyApp/gems/rb-fsevent-0.9.3/bin/fsevent_watch --latency 0.1 /Users/Bodaiou/Clients/MyApp ``` (process 31332) in the screenshot attached. Ruby 2.0.0-p247 Here's my setup: ``` # Gemfile (with irrelevant gems removed) gem 'rails', '4.0.0' group :test do gem 'launchy' gem "mocha", require: false gem 'database_cleaner' gem 'selenium-webdriver' gem 'capybara-webkit' # for headless javascript tests gem 'timecop' gem "minitest-focus" end group :development, :test do gem "minitest-rails" gem "minitest-rails-capybara" gem 'zeus' gem 'guard' gem 'guard-minitest' gem 'factory_girl_rails' end # Guardfile guard :minitest, all_on_start: false do # Rails 4 watch(%r{^app/(.+)\.rb}) { |m| "test/#{m[1]}_test.rb" } watch(%r{^app/controllers/application_controller\.rb}) { 'test/controllers' } watch(%r{^app/controllers/(.+)_controller\.rb}) { |m| "test/integration/#{m[1]}_test.rb" } watch(%r{^app/views/(.+)_mailer/.+}) { |m| "test/mailers/#{m[1]}_mailer_test.rb" } watch(%r{^lib/(.+)\.rb}) { |m| "test/lib/#{m[1]}_test.rb" } watch(%r{^test/.+_test\.rb}) watch(%r{^test/test_helper\.rb}) { 'test' } ignore(%r{^tmp/}) end # test_helper ENV["RAILS_ENV"] = "test" require File.expand_path("../../config/environment", __FILE__) require 'rails/test_help' require 'minitest/autorun' require 'minitest/pride' require "minitest/rails/capybara" require "mocha/setup" # Sidekiq https://github.com/mperham/sidekiq/wiki/Testing require 'sidekiq/testing' Sidekiq::Testing.fake! Dir[Rails.root.join('test', 'support', '*.rb')].each do |file| require file end class MiniTest::Spec include FactoryGirl::Syntax::Methods include AllTestHelper end class ActiveSupport::TestCase include FactoryGirl::Syntax::Methods include AllTestHelper end class Capybara::Rails::TestCase include Rails.application.routes.url_helpers include Capybara::DSL include Capybara::Assertions include IntegrationTestHelper # Called before each Feature spec before :each do end # Called after each Feature spec after :each do Capybara.reset_sessions! end end ``` Gem Versions: - minitest (4.7.5) - minitest-capybara (0.5.0) - minitest-focus (1.1.0) - minitest-metadata (0.4.0) - minitest-rails (0.9.2) - minitest-rails-capybara (0.10.0) - mobvious-rails (0.1.2) - mocha (0.14.0) - guard (2.2.4) - guard-minitest (2.1.2) - rb-fsevent (0.9.3)

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