When installing a gem with C extension in Ruby, I want to finish it quickly using multiple CPU cores like make -j4

At ruby-jp.slack.com

RubyでC拡張を使っているgemをインストールする際に、make -j4 みたいに複数のCPUのコアを使って早く終わらせたい時はどんなオプションをつければいいですか？

環境変数で設定した記憶があるけど忘れてしまった

export GNUMAKEFLAGS=-j4

So the correct answer is

export GNUMAKEFLAGS=-j4

is. According to the number of cores in your computer

GNUMAKEFLAGS=-j8 gem update

Please try. For gems that are using C extensions, the update may finish quickly.

That's all for this article.

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