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
Performance regressions in Ruby on Rails Core
Search
Kir Shatrov
September 27, 2015
Programming
0
200
Performance regressions in Ruby on Rails Core
Slides for my Railsclub Moscow 2015 talk.
Kir Shatrov
September 27, 2015
Tweet
Share
More Decks by Kir Shatrov
See All by Kir Shatrov
Running Jobs at Scale
kirs
1
200
Operating Rails in Kubernetes
kirs
3
430
RailsClub 2016
kirs
2
300
Building a toolkit to detect performance regressions in Ruby on Rails core
kirs
3
5.5k
Развертывание веб-приложений и фреймворк Capistrano
kirs
1
270
Capistrano 3
kirs
4
2.7k
Other Decks in Programming
See All in Programming
신입 안드로이드 개발자의 AI 스타트업 생존기 (+ Native C++ Code를 Android에서 사용해보기)
dygames
0
500
2025/3/18 サービスの成長で生じる幅広いパフォーマンスの問題を、 AIで手軽に解決する
shirahama_x
0
160
Scala 3 で GLSL のための c-like-for を実装してみた
exoego
1
180
AI時代のプログラミング教育 / programming education in ai era
kishida
22
20k
requirements with math
moony
0
520
WordPress Playground for Developers
iambherulal
0
120
AHC 044 混合整数計画ソルバー解法
kiri8128
0
300
新卒から4年間、20年もののWebサービスと 向き合って学んだソフトウェア考古学
oguri
7
6.5k
ローコードサービスの進化のためのモノレポ移行
taro28
1
330
今から始めるCursor / Windsurf / Cline
kengo_hayano
0
110
エンジニア未経験が最短で戦力になるためのTips
gokana
0
200
S3静的ホスティング+Next.js静的エクスポート で格安webアプリ構築
iharuoru
0
190
Featured
See All Featured
Design and Strategy: How to Deal with People Who Don’t "Get" Design
morganepeng
129
19k
Testing 201, or: Great Expectations
jmmastey
42
7.4k
Raft: Consensus for Rubyists
vanstee
137
6.8k
Practical Orchestrator
shlominoach
187
10k
Agile that works and the tools we love
rasmusluckow
328
21k
ピンチをチャンスに:未来をつくるプロダクトロードマップ #pmconf2020
aki_iinuma
118
51k
Save Time (by Creating Custom Rails Generators)
garrettdimon
PRO
30
1.1k
Keith and Marios Guide to Fast Websites
keithpitt
411
22k
Become a Pro
speakerdeck
PRO
27
5.2k
How To Stay Up To Date on Web Technology
chriscoyier
790
250k
10 Git Anti Patterns You Should be Aware of
lemiorhan
PRO
656
60k
A Tale of Four Properties
chriscoyier
158
23k
Transcript
RAILSCLUB 2015 Kir Shatrov 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
higher is faster
higher is faster
higher is faster
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 higher is faster
Full app benchmark before higher is faster
stackprof by Aman Gupta github.com/tmm1/stackprof
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 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/rails/rails webhook web app docker server benchmark suite
None
github.com/ruby-bench web app docker files benchmark suite
Results
Running builds for Rails
Performance regressions caught
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
Спасибо! @kirs @kirshatrov @evilmartians evilmartians.com