Rack::Latency
10:06:49 web.1 | at=info source=yahoo measure#response.size=9 measure#response.latency=130.86ms
10:06:53 web.1 | at=info source=google measure#response.size=11 measure#response.latency=60.65ms
10:06:53 web.1 | at=info source=yahoo measure#response.size=9 measure#response.latency=122.92ms
10:06:57 web.1 | at=info source=google measure#response.size=11 measure#response.latency=53.46ms
10:06:57 web.1 | at=info source=yahoo measure#response.size=9 measure#response.latency=129.75ms
10:07:01 web.1 | at=info source=google measure#response.size=11 measure#response.latency=58.56ms
This gem measures request latency to other hosts. It runs as a separate thread created by its own middleware. If you're running multiple apps that talk to each other, it's a good way to sniff out potential network problems.
On my system, the head measurement times are roughly equivalent to (maybe 10-20% faster than) curl -I.
Installation and Configuration
Add gem 'rack-latency' to your app's Gemfile. Then create an initializer to specify your desired measurements:
# config/initializers/rack-latency.rb
Rack::Latency.configure do |measure|
# time a HEAD request for google.com.
measure.head "http://www.google.com/"
# time a GET request to a Yahoo IP, and rename the measurement to "yahoo".
measure.get "http://98.138.253.109/", name: "yahoo"
# set the delay time between measurement loops.
measure.wait ENV["RACK-LATENCY-WAIT"] || 4
# set the environment(s) in which to run, as defined by Rails.env or RACK_ENV.
# By default, it will only run in production.
measure.environment :production
# or
measure.environments :production, :staging
end
Contributing
- Fork it ( http://github.com//rack-latency/fork )
- Create your feature branch (
git checkout -b my-new-feature) - Commit your changes (
git commit -am 'Add some feature') - Push to the branch (
git push origin my-new-feature) - Create new Pull Request
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