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
Ruby JIT Hacking Guide / RubyKaigi 2023
Search
Takashi Kokubun
May 13, 2023
Programming
2
9.7k
Ruby JIT Hacking Guide / RubyKaigi 2023
Ruby JIT Hacking Guide
https://rubykaigi.org/2023/
Takashi Kokubun
May 13, 2023
Tweet
Share
More Decks by Takashi Kokubun
See All by Takashi Kokubun
YJIT Makes Rails 1.7x faster / RubyKaigi 2024
k0kubun
7
13k
YJIT: Dive into Ruby's JIT compiler written in Rust / Rust.Tokyo 2022
k0kubun
1
2.1k
Towards Ruby 4 JIT / RubyKaigi 2022
k0kubun
3
11k
Optimizing Production Performance with MRI JIT / RubyConf 2021
k0kubun
1
440
Why Ruby's JIT was slow / RubyKaigi Takeout 2021
k0kubun
3
1.9k
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
800
Ruby 3.0 JIT on Rails
k0kubun
9
9.2k
JIT ロードマップ / Ruby 3 さみっと
k0kubun
2
1.5k
Other Decks in Programming
See All in Programming
Let's Take a Peek at PHP Parser 5.x!
inouehi
0
100
goにおける コネクションプールの仕組み を軽く掘って見た
aronokuyama
0
140
Fluent UI Blazor 5 (alpha)の紹介
tomokusaba
0
140
私の愛したLaravel 〜レールを超えたその先へ〜
kentaroutakeda
12
3.5k
List とは何か? / PHPerKaigi 2025
meihei3
0
560
複数ドメインに散らばってしまった画像…! 運用中のPHPアプリに後からCDNを導入する…!
suguruooki
0
430
生産性アップのためのAI個人活用
kunoyasu
0
640
The Evolution of Enterprise Java with Jakarta EE 11 and Beyond
ivargrimstad
0
940
CTFのWebにおける⾼難易度問題について
hamayanhamayan
1
980
PHPによる"非"構造化プログラミング入門 -本当に熱いスパゲティコードを求めて- #phperkaigi
o0h
PRO
0
1.1k
Preact、HooksとSignalsの両立 / Preact: Harmonizing Hooks and Signals
ssssota
1
700
RCPと宣言型ポリシーについてのお話し
kokitamura
2
150
Featured
See All Featured
Fight the Zombie Pattern Library - RWD Summit 2016
marcelosomers
233
17k
The Power of CSS Pseudo Elements
geoffreycrofte
75
5.7k
Building Adaptive Systems
keathley
41
2.5k
Designing Dashboards & Data Visualisations in Web Apps
destraynor
231
53k
Improving Core Web Vitals using Speculation Rules API
sergeychernyshev
12
610
Mobile First: as difficult as doing things right
swwweet
223
9.5k
What’s in a name? Adding method to the madness
productmarketing
PRO
22
3.4k
Become a Pro
speakerdeck
PRO
27
5.2k
The Art of Delivering Value - GDevCon NA Keynote
reverentgeek
12
1.4k
Speed Design
sergeychernyshev
28
860
What's in a price? How to price your products and services
michaelherold
245
12k
Bash Introduction
62gerente
611
210k
Transcript
Ruby JIT Hacking Guide @k0kubun
@k0kubun
RJIT ERB Haml Slim I maintain
What's JIT?
Ruby JITs MJIT Ruby 2.6
Ruby JITs YJIT Ruby 3.1 MJIT Ruby 2.6
Ruby JITs YJIT Ruby 3.1 MJIT Ruby 2.6 RJIT Ruby
3.3
Railsbench Speedup relative to 2.5 No JIT (s/s) 0 0.5
1 1.5 2 Ruby 2.5 Ruby 2.6 Ruby 2.7 Ruby 3.0 Ruby 3.1 Ruby 3.2 Ruby 3.3 1.93 1.85 1.54 1.59 1.2 1.25 1.08 1.05 1.07 1.26 1.24 1.12 1.09 1.05 1.07 1 No JIT MJIT / RJIT YJIT
Ruby 3.2 YJIT
Ruby 3.3 YJIT
Using YJIT • Install Rust and then build Ruby •
Use --yjit or export RUBY_YJIT_ENABLE=1
Ruby JIT Hacking Guide
Ruby Hacking Guide
Ruby JIT Hacking Guide JIT JIT
How Ruby JIT works Ruby
How Ruby JIT works 1 + 2 Ruby Abstract
Syntax Tree
How Ruby JIT works 1 + 2 putobject 1 putobject
2 opt_plus leave Ruby Abstract Syntax Tree Instruction Sequence (Bytecode)
How Ruby JIT works 1 + 2 putobject 1 putobject
2 opt_plus leave Ruby Abstract Syntax Tree Instruction Sequence (Bytecode) Machine Code
x86_64 assembly
• Read asm comments •--yjit-dump-disasm •--rjit-dump-disasm x86_64 assembly
• mov: assignment instruction • esi: register for stack[0] x86_64
assembly stack[0] = 3
x86_64 assembly • mov: assignment instruction • edi: register for
stack[1] stack[0] = 3 stack[1] = 5
x86_64 assembly • add,sub: arithmetic instruction • rax: temporary register
stack[0] = 3 stack[1] = 5 temp = stack[0] temp -= 1 temp += stack[1]
x86_64 assembly • jo: jump if over fl ow •
rsi: register for stack[0] stack[0] = 3 stack[1] = 5 temp = stack[0] temp -= 1 temp += stack[1] jump if overflow stack[0] = temp
x86_64 encoding
x86_64 encoding opv86: https://hikalium.github.io/opv86/
x86_64 encoding opv86: https://hikalium.github.io/opv86/
Calling a custom JIT Ruby 3.2 Ruby 3.3+ 1. Run
Ruby with --mjit=pause --rjit=pause 2. Override RubyVM::MJIT.compile RubyVM::RJIT#compile 3. Call RubyVM::MJIT.resume RubyVM::RJIT.resume
Building JIT is fun
k0kubun/ruby-jit-challenge Ruby JIT Challenge
Ruby JIT Challenge Hashtag: #ruby-jit-challenge Speedup relative to No JIT
(s/s) 0 3 6 9 12 No JIT RJIT YJIT Ruby JIT 11.08 6.31 3.75 1 Fibonatti benchmark
Optimizing Ruby JIT
Side exits side exit
Method rede fi nition Rede fi nition Hook Invalidate
Method rede fi nition Rede fi nition Hook Invalidate side
exit
Constant rede fi nition
Register allocation: Stack 0: rsi 1: rdi 4: r10 2:
r8 3: r9 VM stack
Register allocation: Stack 0: rsi 1: rdi 4: r10 2:
r8 3: r9 VM stack
Register allocation: Local variables • Spill registers on C function
calls • Binding • debug_inspector API
Polymorphic method cache
Splitting
Method inlining
Conclusion • Enjoy custom JIT development • Let's make YJIT
the best Ruby JIT