macbook airにvagrantとvirtual boxでvmを立てて、CentOSを入れてRailsのプロジェクトを動かしているのですが、割りと初期からよくこんなエラーが出てました。 /home/hoge/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/spring-1.1.2/lib/spring/application.rb:153:in `fork': Cannot allocate memory - fork(2) (Errno::ENOMEM)
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