如何在 Ruby 中分析 `require` 语句？

Question

我有兴趣查看我的 Ruby 代码中的每个 require 语句需要多长时间（以秒为单位）加载。如何临时覆盖该方法并打印出一些慢速加载的日志信息？

Answer 1

您可以像这样覆盖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