CODEWITHSUNDEEP
ruby-on-railsrubyperformance
Blankman
Blankman

Reputation: 267140

Page load time, when in RoR lifecycle do you start/stop a timer to get this stat?

Page load time, when in RoR lifecycle do you start/stop a timer to get this stat?

I know I can create a before/after at the controller level, is there anything higher up in the chain that I get start/stop this timer?

I want to get timings for a production release also, not just development mode where things are always slower.

Upvotes: 0

Views: 657

Answers (2)

ben.m
ben.m

Reputation: 621

i did something like Ryan Bates in episode 151 as aforementioned

require 'rack/utils'

class ResponseTimer
  def initialize(app, message = "Response Time")
    @app = app
    @message = message
  end

  def call(env)
    dup._call(env)
  end

  def _call(env)
    @start = Time.now
    @status, @headers, @response = @app.call(env)
    @stop = Time.now
    [@status, @headers, self]
  end

  def each(&block)
    block.call("<!-- #{@message}: #{@stop - @start} -->\n") if @headers["Content-Type"].include? "text/html"
    @response.each(&block)
  end
end

but it doesn't take into account external javascript/css loading time

= javascript_include_tag "http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"

Upvotes: 0

bnferguson
bnferguson

Reputation: 176

If I were trying to get the most complete picture of my response time I'd use something like NewRelic's RPM, or build something not unlike the example here http://asciicasts.com/episodes/151-rack-middleware

By having it track it in the middleware you're getting most (if not all) of the Rails stack in the metric instead of just the controller call. Also you can use it for other things like Sinatra apps. :)

Upvotes: 3

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