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bundle install を並列実行するとかなり快適になった

Last updated at Posted at 2015-10-07

CircleCI のログを眺めてたら、便利なオプションを見つけました。
bundle install--jobs=4 をつけると並列処理してくれるみたいです。(Bundler v1.5 以上

bundle check --path=vendor/bundle || bundle install --path=vendor/bundle --jobs=4 --retry=3 
The following gems are missing
 * autodoc (0.5.0)
 * jbuilder (2.3.1)
 * rspec-json_matcher (0.1.5)
Install missing gems with `bundle install`
Fetching gem metadata from https://rubygems.org/..........
Fetching gem metadata from https://rails-assets.org/..
Fetching version metadata from https://rubygems.org/...
Fetching version metadata from https://rails-assets.org/..
Fetching dependency metadata from https://rubygems.org/..
Fetching dependency metadata from https://rails-assets.org/..
Fetching gem metadata from https://rubygems.org/..........
Fetching version metadata from https://rubygems.org/...
Fetching dependency metadata from https://rubygems.org/..
Fetching gem metadata from https://rails-assets.org/..
Fetching version metadata from https://rails-assets.org/.
Using i18n 0.7.0
Using json 1.8.3
Using rake 10.4.2
Using CFPropertyList 2.3.1
Using minitest 5.7.0
(省略)

CPU コア数にあわせて --jobs オプションを指定すれば、bundle install が遅い問題を解消できて、きっと幸せになれるはず。

追記)Mac 上で、CPU コア数をもとに設定する

bundle config --global jobs `expr $(sysctl -n hw.ncpu) - 1`

上記のコマンドを実行すると

~/.bundle/config
BUNDLE_JOBS: '3'

と設定される。

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