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
Deoptimization: How YJIT Speeds Up Ruby by Slow...
Search
Takashi Kokubun
April 16, 2025
Programming
2
3.4k
Deoptimization: How YJIT Speeds Up Ruby by Slowing Down / RubyKaigi 2025
https://rubykaigi.org/2025
Takashi Kokubun
April 16, 2025
Tweet
Share
More Decks by Takashi Kokubun
See All by Takashi Kokubun
ZJIT: Building a New JIT Compiler for Ruby / REBASE 2025
k0kubun
0
18
YJIT Makes Rails 1.7x faster / RubyKaigi 2024
k0kubun
7
14k
Ruby JIT Hacking Guide / RubyKaigi 2023
k0kubun
2
10k
YJIT: Dive into Ruby's JIT compiler written in Rust / Rust.Tokyo 2022
k0kubun
2
2.2k
Towards Ruby 4 JIT / RubyKaigi 2022
k0kubun
3
11k
Optimizing Production Performance with MRI JIT / RubyConf 2021
k0kubun
1
480
Why Ruby's JIT was slow / RubyKaigi Takeout 2021
k0kubun
3
2k
数時間かかる週一リリースを毎日何度も爆速でできるようにするまで / CI/CD Conference 2021
k0kubun
21
14k
Ruby 3 JIT's roadmap / RubyConf China 2020
k0kubun
0
840
Other Decks in Programming
See All in Programming
The Past, Present, and Future of Enterprise Java
ivargrimstad
0
250
3年ぶりにコードを書いた元CTOが Claude Codeと30分でMVPを作った話
maikokojima
0
630
Domain-centric? Why Hexagonal, Onion, and Clean Architecture Are Answers to the Wrong Question
olivergierke
3
970
モテるデスク環境
mozumasu
3
1.3k
理論と実務のギャップを超える
eycjur
0
180
CSC509 Lecture 06
javiergs
PRO
0
270
テーブル定義書の構造化抽出して、生成AIでDWH分析を試してみた / devio2025tokyo
kasacchiful
0
290
社会人になっても趣味開発を続けたい! / traPavilion
mazrean
1
100
バッチ処理を「状態の記録」から「事実の記録」へ
panda728
PRO
0
190
iOSでSVG画像を扱う
kishikawakatsumi
0
170
釣り地図SNSにおける有料機能の実装
nokonoko1203
0
200
マンガアプリViewerの大画面対応を考える
kk__777
0
250
Featured
See All Featured
Into the Great Unknown - MozCon
thekraken
40
2.1k
Speed Design
sergeychernyshev
32
1.2k
StorybookのUI Testing Handbookを読んだ
zakiyama
31
6.2k
Building Flexible Design Systems
yeseniaperezcruz
329
39k
Typedesign – Prime Four
hannesfritz
42
2.8k
Fight the Zombie Pattern Library - RWD Summit 2016
marcelosomers
234
17k
What's in a price? How to price your products and services
michaelherold
246
12k
The Success of Rails: Ensuring Growth for the Next 100 Years
eileencodes
46
7.7k
A better future with KSS
kneath
239
18k
The Myth of the Modular Monolith - Day 2 Keynote - Rails World 2024
eileencodes
26
3.1k
Helping Users Find Their Own Way: Creating Modern Search Experiences
danielanewman
30
2.9k
Building Applications with DynamoDB
mza
96
6.7k
Transcript
Deoptimization: How YJIT Speeds Up Ruby by Slowing Down @k0kubun
/ RubyKaigi 2025
@k0kubun
@k0kubun Z
None
We’re hiring https://candidate.shopify.com/form/ruby-kaigi-2025
None
YJIT
None
https://railsatscale.com/2025-01-10-yjit-3-4-even-faster-and-more-memory-ef fi cient/
None
None
Deoptimization
None
Deoptimization What if you can “slow down” Ruby at any
time? You can speculatively optimize Ruby and invalidate it later
Playing with Deoptimization Build Ruby with: ./con fi gure --enable-yjit=dev
Run Ruby with: ruby --yjit-call-threshold=1 --yjit-dump-disasm
Playing with Deoptimization
None
YJIT Deoptimization
Code Patching
None
None
None
None
Rewrite
Rewrite Jump
Global Invalidation
None
None
None
Ruby 3.4’s New YJIT Deoptimization
Invalidation on Escaped Locals
?
None
None
Invalidation on Singleton Classes
None
None
None
None
Singleton Class Invalidation
Lazy Frame Push
None
None
None
Lazy Frame Push
None
None
None
None
YJIT-only Ruby Methods
Array#each
None
None
None
None
None
None
None
Primitive.attr! :c_trace
Conclusion Deoptimization enables speculative optimizations with lazy invalidation Ruby 3.4
YJIT optimizes method calls and local variables using deoptimization