Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Building a toolkit to detect performance regressions in Ruby on Rails core
Search
Kir Shatrov
April 22, 2015
Programming
3
5.2k
Building a toolkit to detect performance regressions in Ruby on Rails core
My talk from RailsConf 2015.
Kir Shatrov
April 22, 2015
Tweet
Share
More Decks by Kir Shatrov
See All by Kir Shatrov
Running Jobs at Scale
kirs
1
190
Operating Rails in Kubernetes
kirs
3
400
RailsClub 2016
kirs
2
300
Performance regressions in Ruby on Rails Core
kirs
0
190
Развертывание веб-приложений и фреймворк Capistrano
kirs
1
260
Capistrano 3
kirs
4
2.6k
Other Decks in Programming
See All in Programming
なぜ宣言的 UI は壊れにくいのか / Why declarative UI is less fragile
uenitty
29
13k
Trial
cairolibrary720
1
130
How to use Macrobenchmark
veronikapj
0
160
さきがけから振り返るアーキテクチャ刷新 / Reflecting on the Architectural Renewal from the Vanguard
nrslib
2
770
APIのない大学ログインWebサービスをWKWebViewとJavaScriptでアプリ化した話
akidon0000
1
330
Namespace on read
tagomoris
2
370
DynamoDB コスト最適化っぽいことの基本 with Terraform
kuro_kurorrr
2
250
CSC307 Lecture 07
javiergs
PRO
0
220
スクラムマスターって孤独じゃないですか?
yoshitaroyoyo
1
140
君たちはどうコードをレビューする (される) か / 大吉祥寺.pm
utgwkk
15
8.5k
TiDB Serverless ~理想のServerless DBを考える~
soso_15315
1
160
リハビリmruby
kishima
1
160
Featured
See All Featured
Building Your Own Lightsaber
phodgson
101
5.9k
Bash Introduction
62gerente
607
210k
Thoughts on Productivity
jonyablonski
64
4.1k
Faster Mobile Websites
deanohume
303
30k
Documentation Writing (for coders)
carmenintech
63
4.2k
Docker and Python
trallard
37
2.9k
StorybookのUI Testing Handbookを読んだ
zakiyama
15
4.9k
Scaling GitHub
holman
458
140k
The Language of Interfaces
destraynor
151
23k
Music & Morning Musume
bryan
43
5.9k
Become a Pro
speakerdeck
PRO
15
4.8k
JavaScript: Past, Present, and Future - NDC Porto 2020
reverentgeek
44
4.7k
Transcript
Kir Shatrov, RailsConf 2015 Building a toolkit to detect performance
regressions in Ruby on Rails core
@kirs @kirshatrov !"
None
Catching Performance Regressions in Rails
What’s a performance regression?
What’s a performance regression in Rails?
Page load 250ms → 4s
Case Study
4.2rc1
None
2 times slower
4.2rc3
Faster framework = Faster app
Examples from Rails commits
Metrics
Timing & Allocations
Faster Methods = Faster App
start = Time.now.to_f sleep 5 ends = Time.now puts "it
took #{ends - start}"
Allocations = GC work Less allocations = less GC work
before = GC.stat[:total_allocated_object] 10_000.times do { "key" => "value" }
end after = GC.stat[:total_allocated_object] puts "allocated: #{after - before}"
Basic primitives
Examples from Rails commits String
None
None
None
None
None
None
None
None
None
None
Examples from Rails commits Hash
None
None
None
None
None
None
Optimize only “hot” code
Track the changes
The Idea to build a service
Track it with benchmarks
Any existing benchmarks?
None
Setup Discourse Populate records Start Unicorn with RAILS_ENV=production Make requests
with Apache Bench to the list of endpoints Print timings and memory usage
Components to benchmark activerecord activemodel actionview actioncontroller activesupport
3.2 – 4.0 – 4.1 – 4.2
None
None
None
None
ActiveRecord Finders require_relative 'support/activerecord_base.rb' require_relative 'support/benchmark_rails.rb' User.create!(name: 'kir', email: '
[email protected]
')
m = Benchmark.rails(100, "activerecord/#{db_adapter}/finders") do User.find(1) end puts m.to_json
Disable GC is necessary Warm up the code Make N
iterations Calculate the mean timing and object allocations
ActiveRecord::Base#create require_relative 'support/activerecord_base.rb' require_relative 'support/benchmark_rails.rb' fields = { name: "Kir",
notes: "Note", created_at: Date.today } Benchmark.rails(1000, "activerecord/#{db_adapter}/create") do Exhibit.create(fields) end
Correct benchmarks
Full app benchmark
Full app benchmark before
stackprof by Aman Gupta github.com/tmm1/stackprof
4.2 4.1
config/environments/production.rb
Full app benchmark after
✅ Benchmarks
None
None
The Service
What do we want? See benchmark for every commit See
benchmark for every PR Report to PR author (“activerecord became 2% slower”) See charts
railsperf.evilmartians.io The prototype of the service. Built in January
rubybench.org by Sam Saffron and Guo Xiang Tan “Alan”
None
3.6GHz Intel® Xeon® E3-1270 v3 Quad-Core 4 x 8GB Micron
ECC Samsung SSD 845DC EVO - 240 GB Sponsored hardware
ruby-bench + rails
github.com/ruby/ruby webhook web app docker server benchmark suite
None
github.com/ruby-bench web app docker files benchmark suite
github.com/ruby-bench web app docker files benchmark suite
github.com/ruby-bench web app docker files benchmark suite
github.com/ruby-bench web app docker files benchmark suite
Results
Running builds for Rails
250k builds for Ruby
MRI performance regression caught
What’s next?
What’s next Pull Request benchmarks Weekly reports JRuby support
Overview What is a performance regression How to track them
How to solve them How to write benchmarks Automate tracking!
How to track your app performance? Study how do Ruby
objects work and how to treat them Write a Discourse-like benchmark and run it on Travis Subscribe to Rails Weekly
Ruby Under a Microscope
http://bit.ly/writing-fast-ruby
How to track your app performance? Study how do Ruby
objects work and how to treat them Write a Discourse-like benchmark and run it on Travis Subscribe to Rails Weekly
Setup the app Populate records Start Unicorn with RAILS_ENV=production Make
requests with Apache Bench to the list of endpoints Print timings and memory usage
How to track your app performance? Study how do Ruby
objects work and how to treat them Write a Discourse-like benchmark and run it on Travis Subscribe to Rails Weekly
bit.ly/railsperf-gh github.com/rubybench bit.ly/railsperf-static
Thanks! @kirs @kirshatrov @evilmartians evilmartians.com