如何用Rails应用程序的ruby输出KCacheGrind的调用树分析？

Question

根据文档，您可以分析Rails应用程序http://ruby-prof.rubyforge.org/

我把这个添加到我的config.ru中

if Rails.env.development?
  use Rack::RubyProf, :path => 'tmp/profile'
end

但是，它只输出以下文件

users-1-call_stack.html
users-1-flat.txt
users-1-graph.html
users-1-graph.txt

这个输出是完全无法理解的。所以我下载了QCacheGrind for Windows。http://sourceforge.net/projects/qcachegrindwin/?source=recommended

它不会读任何那些文件。ruby-prof docs说您可以生成KCacheGrind文件。

鲁比教授：：CallTreePrinter创建一个与KCachegrind兼容的调用树报告。

但是它并没有说如何用Rails来实现它。我查看了页面中的RubyProf，但它是空的。http://ruby-prof.rubyforge.org/classes/Rack/RubyProf.html

Ruby2.0.0，Rails 4.0.3

Answer 1

  helper_method :profile
  around_action :profile, only: [:show] 

  def profile(prefix = "profile")
    result = RubyProf.profile { yield }

    # dir = File.join(Rails.root, "tmp", "profile", params[:controller].parameterize)
    dir = File.join(Rails.root, "tmp", "profile")
    FileUtils.mkdir_p(dir)
    file = File.join(dir, "callgrind.%s.%s.%s" % [prefix.parameterize, params[:action].parameterize, Time.now.to_s.parameterize] )
    open(file, "w") {|f| RubyProf::CallTreePrinter.new(result).print(f, :min_percent => 1) }
  end

Answer 2

改变config.ru

use Rack::RubyProf, :path => ::File.expand_path('tmp/profile'),
      :printers => {::RubyProf::FlatPrinter => 'flat.txt',
                                    ::RubyProf::GraphPrinter => 'graph.txt',
                                    ::RubyProf::GraphHtmlPrinter => 'graph.html',
                                    ::RubyProf::CallStackPrinter => 'call_stack.html',
                                    ::RubyProf::CallTreePrinter => 'call_grind.txt',
  }