Use git-linguist to implement CommitLanguages

Jacob Vosmaerrequested to merge
git-linguist into master

Advantages:

  • gitaly-ruby base memory footprint drops from 110MB to 10MB
  • avoids memory leaks in long-running multi-threaded process gitaly-ruby
  • uses built-in disk caching from git-linguist (speeds up calculation from 12s to 4s, including boot time, on gitlab-ce repo)

Disadvantages:

  • each CommitLanguages request will take 2-3s at minimum just to boot git-linguist
  • each CommitLanguages request will use at least 100MB of RAM to boot git-linguist
Edited by GitLab Release Tools Bot

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