#411 Performance Testing pro

Mar 27, 2013 | 16 minutes | Performance

Learn how to add performance tests that automate benchmark and profile reports. Here I show how to find the bottlenecks to optimize a page. I also show how to compile Ruby with gcdata to get information about memory usage.

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notentered over 11 years ago

Is there a way to use this with RSpec?

Kenny Meyer over 11 years ago

There is this Gist I have found: https://gist.github.com/galaxylord/1451289

It basically boils down to this:

          ruby
        
      it 'takes time' do
        Benchmark.realtime{
          get :index
        }.should < 1.5
      end

It would be awesome to see some native support for RSpec, if it is appropriate, but the real question is why there is no API yet in RSpec, being such a popular project.

Chocolat sans sucre about 8 years ago

baby90 over 7 years ago

It works great

Dwayne Macgowan over 11 years ago

This seems to be the solution:
https://github.com/sinisterchipmunk/rspec-prof

Luke Cowell over 11 years ago

+1 This is working for me.

punaise-de-lit over 7 years ago

+1 It works

ABBY almost 7 years ago

1 , nice !

Pierre GD almost 7 years ago

wiremine over 11 years ago

FYI, I think rake test:benchmark is currently broken with rails 4 beta.

Ryan Siddle over 11 years ago

The performance gem has been moved outside of Rails 4. Did you remember to include these gems to include the benchmark functionality?

gem 'ruby-prof', group: :test
gem 'test-unit', group: :test

George Armhold almost 11 years ago

As per the Rails 4 docs performance tests are no longer part of the default stack.. You need to add the rails-perftest gem:

gem 'rails-perftest'

Luke Cowell over 11 years ago

Thanks Ryan - awesome as usual and well worth the wait!

It's probably worth mentioning that the reason number_to_currency is popping up is because the example page isn't doing much, so the time spent in the call becomes significant.

Mark Milman over 11 years ago

Good episode - thanks.
juts wondering if anyone knows of a way to load / stress test a rails app simulating multiple users logging in at the same time

Jack Xiaosong Xu over 11 years ago

I have used https://github.com/dbrady/tourbus for simulating multiple concurrent users. you will need to use jruby to run the test client.

Mark Milman over 11 years ago

Thanks

Ian Dickson over 11 years ago

Thanks Ryan!

Went ahead and set it up in my development environment on Mac OS 10.8.3.

I'm using RVM, so getting the ruby gc patch for p125 was like so:

          shell
        
rvm install ruby-1.9.3-p125 --with-gcc=gcc --patch gcdata -n gcdata

Benjamin Harmless Huber over 11 years ago

what do you think of the assert_linear_performance idea.

http://www.revision-zero.org/benchmarking

i like the idea of asserting the complexity itself instead of a specific time value.
sure it's something different but as far as it concerns tests that could/should brake if violated this idea sound interesting.

michaelwhitley over 11 years ago

Great episode as always. How do I do this testing with devise authentication?

KarlaBombey about 8 years ago

I agree with you!

Ed Winn over 11 years ago

Not to be that guy, but as i usually see valid questions after the railscasts episodes, I'm wondering why Ryan doesn't seem to respond to any of them anymore. I love railscasts and have been a pro member since the beginning, but a lot of the time valid questions asked directly to Ryan or the community go unanswered. I think for the number of pro members and the posts it would be helpful to get an experts opinion on the valid points that are brought up after each episode is released. I'm not saying directly that this episode is the root of the problem, I'm just looking at the overall picture after about a year of pro episodes.

Disclaimer: This is not a troll post and I greatly value both the content and quality of the episodes. Just bringing up a valid point.

Heck a lot of the times the gem author even ends up contributing in most of them, but it seems like Ryan is ususally mum lately after each episode has been released. Now I know he is a busy guy and has a lot on his plate, but at least answer a few questions after the initial release, when the iron is hot, I don't expect him to answer all questions, but some feedback or clarification would be appreciated.

Again, sorry to be that guy on the forum.

Bharat Ruparel over 11 years ago

You do bring up a point. Understood and well taken. I cannot and will not speak for Ryan, so here is my take on it. The Pro episodes are by definition providing cutting edge research and we cannot expect him to express his opinion anymore than he already does while presenting the episodes.

What I find significantly more valuable is that more knowledgeable and experienced people with those technologies chime in and contribute their opinions and share their knowledge. Angular JS episode is a great example. I find Brandon Tilley's contributions so good that I am often referring to them as I am learning Angular JS.

This does not mean that I do not ask Ryan any questions or provide my feedback etc. I have found that he always responds to the feedback that I provide via emails and does not shy away from expressing his opinion. May be RailsCasts episode discussions are just not the right forum for him to take a position.

So, personally, it does not bother me that he chooses not to participate in the Railscasts forums anymore. What would bother me infinitely more is that he "stops" publishing the Railscasts. The research that he puts into them saves an incredible amount of time as a Rails developer.

Michael over 11 years ago

We can expect him to fulfill the promise of "one pro episode per week" though. I have mailed him using the feedback on this site asking what's up, but overall the frequency of pro episodes has been less than one a week -- nearly one every 2 weeks in some cases.

411 came out on Mar 27, and 410 on Mar 12 -- 15 days. March 12 to Mar 4 is 8 days, and March 4 to Feb 14 is well over two weeks apart.

I understand he has other tasks, but if we buy into something with a promise, I would like that promise to be fulfilled, or we change the terms. I too would find the lack of something like Railscasts a serious loss to the Rails community, but if he can't fulfill the terms under which I signed up for the pro episodes, having already dropped the free ones somewhat, then we need to have new terms agreed upon.

Michael over 11 years ago

I am not concerned that Ryan is no longer responding directly, BTW. Having the gem author, or other community members involved is a great thing. More people means more brains, and better answers.

I do fear that his lack of response, and the recent mail about dropping the free episode frequency, is a warning sign.

daz over 11 years ago

What about us on Ruby 2.0?

Sebastian Skalacki over 11 years ago

I use the less hacky approach to use production dump in performance tests. I simply introduce benchmark environment. I just:

put require_relative 'test' into /config/environments/benchmark.rb so that benchmark environment mimics test
add proper entry to /config/database.yml
possibly add Bundler.require(*Rails.groups(:test => %w[test benchmark])) to /config/application.rb to get gems loaded
begin my performance_test_helper.rb with ENV["RAILS_ENV"] = "benchmark" ; require_relative '../../config/environment'.

I use RSpec for general testing, so this perfectly works for me. You may need further tweaks (esp. in point 4) if you want to use Test::Unit for other tests too.

Troels Knak-Nielsen about 11 years ago

To avoid having test:prepare run each time, you can further drop this into Rakefile:

          ruby
        
Rake.application.instance_eval do
  # Remove test:prepare
  @tasks['test:benchmark'].prerequisites.shift
  @tasks['test:profile'].prerequisites.shift
end

Telvue Engineering almost 10 years ago

I ran into a "gotcha" on Rails Perf Testing that no Docs or 'Casts seem to mention. I couldn't figure out why my tests were being run 4 times, no matter what I passed in the runs: arg to self.profile_options. For example, if you place a puts in your test_ method, you'll see it output 4 times.

The Perf-Test code runs your test once for each "metric" it is measuring. So by constraining it to only :process_time, you can force the test to only run once.

          ruby
        
self.profile_options = { runs: 1, metrics: [ :process_time ] }

(Process Time only applies to a Profile Test. For a Benchmark, you would do [:wait_time].)

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Nice article.

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Nice article.

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I'm using RVM, so getting the ruby gc patch for p125 was like so:

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