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なんかおそいRubyメソッドの実行時間をプロファイリングするまでもなくささっと計測したい

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    def super_slow_method
      sleep(999999999)
    end

    def self.timer(method)
      alias_method "#{method}_without_timer", method
      define_method("#{method}_with_timer") do |*args,&block|
        start = Time.now
        ret = send("#{method}_without_timer", *args, &block)
        $stderr.puts "#{method}: #{Time.now-start}"
        ret
      end
      alias_method method, "#{method}_with_timer"
    end
    timer :super_slow_method

こういうgemがありそうなものだ

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