如何在 Ruby 中分析“require”語句？

Question

我很想知道我的 Ruby 代碼中的每個require語句加載require多長時間（以秒為單位）。 如何臨時覆蓋該方法並打印出一些用於慢速加載的日志信息？

Answer 1

您可以像這樣覆蓋Kernel.require ：

module Kernel
  # make an alias of the original require
  alias_method :original_require, :require

  # rewrite require
  def require name
    start = Time.now

    # code to time
    ret = original_require name

    finish = Time.now
    diff = finish - start

    # TODO: This should really add up all of
    # the require calls for a certain module
    if diff > 0.1
      puts "#{diff} #{name}"
    end
    ret
  end
end