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 regres...
Search
Kir Shatrov
April 22, 2015
Programming
3
5.6k
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
210
Operating Rails in Kubernetes
kirs
3
450
RailsClub 2016
kirs
2
310
Performance regressions in Ruby on Rails Core
kirs
0
210
Развертывание веб-приложений и фреймворк Capistrano
kirs
1
280
Capistrano 3
kirs
4
2.7k
Other Decks in Programming
See All in Programming
GitHub Copilot and GitHub Codespaces Hands-on
ymd65536
2
150
ソフトウェア品質を数字で捉える技術。事業成長を支えるシステム品質の マネジメント
takuya542
2
14k
Team operations that are not burdened by SRE
kazatohiei
1
320
なぜ適用するか、移行して理解するClean Architecture 〜構造を超えて設計を継承する〜 / Why Apply, Migrate and Understand Clean Architecture - Inherit Design Beyond Structure
seike460
PRO
3
780
AI時代の『改訂新版 良いコード/悪いコードで学ぶ設計入門』 / ai-good-code-bad-code
minodriven
20
8.3k
すべてのコンテキストを、 ユーザー価値に変える
applism118
3
1.4k
AI コーディングエージェントの時代へ:JetBrains が描く開発の未来
masaruhr
1
200
dbt民主化とLLMによる開発ブースト ~ AI Readyな分析サイクルを目指して ~
yoshyum
3
1.1k
ペアプロ × 生成AI 現場での実践と課題について / generative-ai-in-pair-programming
codmoninc
2
19k
ニーリーにおけるプロダクトエンジニア
nealle
0
870
Modern Angular with Signals and Signal Store:New Rules for Your Architecture @enterJS Advanced Angular Day 2025
manfredsteyer
PRO
0
230
ruby.wasmで多人数リアルタイム通信ゲームを作ろう
lnit
3
500
Featured
See All Featured
Adopting Sorbet at Scale
ufuk
77
9.5k
Intergalactic Javascript Robots from Outer Space
tanoku
271
27k
For a Future-Friendly Web
brad_frost
179
9.8k
Music & Morning Musume
bryan
46
6.6k
Imperfection Machines: The Place of Print at Facebook
scottboms
267
13k
Building Adaptive Systems
keathley
43
2.7k
Scaling GitHub
holman
460
140k
The Power of CSS Pseudo Elements
geoffreycrofte
77
5.9k
The Language of Interfaces
destraynor
158
25k
I Don’t Have Time: Getting Over the Fear to Launch Your Podcast
jcasabona
32
2.4k
Faster Mobile Websites
deanohume
307
31k
Thoughts on Productivity
jonyablonski
69
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