Akainaa (赤いなぁ)

Akainaa is a gem to visualize code hotspot based on Coverage. This gem can be used for the following purposes:

• super rough code profiler: The intensity of the red background for each line is proportional to the number of times it has been executed.
• A tool helps to understand what happened in a request: Akainaa have the reset button on Web UI, so user can easily record code execution for only one request.

You can see actual result view from here, which recorded on isucon13 code in one benchmark run on ISUNARABE. And also here is the result of simplecov-html(0.12.3) from same coverage, so you can compare the result.

Install the gem and add to the application's Gemfile by executing:

$ bundle add akainaa

If bundler is not being used to manage dependencies, install the gem by executing:

$ gem install akainaa

call Akainaa.start before your application load, and mount middleware. Here is example:

require 'akainaa'

Akainaa.start(project_dir: File.expand_path(__dir__))

require_relative 'app'

use Akainaa::Middleware
run App

Boot up application, do something, and access /akainaa. It will show Web UI what and how many executed.

After checking out the repo, run bin/setup to install dependencies. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and the created tag, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/riseshia/akainaa.

The gem is available as open source under the terms of the MIT License.