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Ruby2.1+でのunicornのGCチューニング

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unicornのGCでお世話になっているunicorn/oob_gcだが、https://github.com/defunkt/unicorn/blob/master/lib/unicorn/oob_gc.rb を見てみると

Strongly consider https://github.com/tmm1/gctools if using Ruby 2.1+ It is built on new APIs in Ruby 2.1, so it is more intelligent than this historical implementation.

Ruby2.1+の場合は https://github.com/tmm1/gctools を使ってね、とのこと。

作者の記事: http://tmm1.net/ruby21-oobgc/
日本語訳: http://www.sawanoboly.net/contribution/2014/3/13/ruby-21-out-of-band-gc

READMEによるとruby2.1で提供されているapiとイベントを使ってGCの挙動を変更するらしい。したがってunicorn/oob_gcとセットでやっていたGC.disableはいらなくなる。

インストールは

gem install gctools

bundlerを使う場合はGemfileに

gem 'gctools'

のあとbundle install

unicornで使う場合はconfig.ruに以下を追記。

require 'gctools/oobgc'
if defined?(Unicorn::HttpRequest)
  use GC::OOB::UnicornMiddleware
end
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