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
Asynchronous Processing for Fun and Profit
Search
Mike Perham
November 02, 2012
Technology
11
880
Asynchronous Processing for Fun and Profit
Some pro tips and an overview of Sidekiq for great async victory!
Mike Perham
November 02, 2012
Tweet
Share
More Decks by Mike Perham
See All by Mike Perham
Computer Science vs Software Engineering
mperham
0
330
A Tribute to Ezra Zygmuntowicz
mperham
1
1k
Other Decks in Technology
See All in Technology
Function Body Macros で、SwiftUI の View に Accessibility Identifier を自動付与する/Function Body Macros: Autogenerate accessibility identifiers for SwiftUI Views
miichan
2
170
Automating Web Accessibility Testing with AI Agents
maminami373
0
1k
Snowflakeの生成AI機能を活用したデータ分析アプリの作成 〜Cortex AnalystとCortex Searchの活用とStreamlitアプリでの利用〜
nayuts
0
290
【Grafana Meetup Japan #6】Grafanaをリバプロ配下で動かすときにやること ~ Grafana Liveってなんだ ~
yoshitake945
0
270
スプリントレトロスペクティブはチーム観察の宝庫? 〜チームの衝突レベルに合わせたアプローチ仮説!〜
electricsatie
1
160
まだ間に合う! StrandsとBedrock AgentCoreでAIエージェント構築に入門しよう
minorun365
PRO
11
930
ガチな登山用デバイスからこんにちは
halka
1
210
Nstockの一人目エンジニアが 3年間かけて向き合ってきた セキュリティのこととこれから〜あれから半年〜
yo41sawada
0
200
なぜスクラムはこうなったのか?歴史が教えてくれたこと/Shall we explore the roots of Scrum
sanogemaru
3
960
AWSを利用する上で知っておきたい名前解決のはなし(10分版)
nagisa53
1
360
おやつは300円まで!の最適化を模索してみた
techtekt
PRO
0
280
サンドボックス技術でAI利活用を促進する
koh_naga
0
190
Featured
See All Featured
Why Our Code Smells
bkeepers
PRO
339
57k
The Language of Interfaces
destraynor
161
25k
10 Git Anti Patterns You Should be Aware of
lemiorhan
PRO
656
61k
CSS Pre-Processors: Stylus, Less & Sass
bermonpainter
358
30k
Music & Morning Musume
bryan
46
6.8k
Scaling GitHub
holman
463
140k
"I'm Feeling Lucky" - Building Great Search Experiences for Today's Users (#IAC19)
danielanewman
229
22k
The Art of Programming - Codeland 2020
erikaheidi
55
13k
[RailsConf 2023] Rails as a piece of cake
palkan
57
5.8k
GitHub's CSS Performance
jonrohan
1032
460k
Exploring the Power of Turbo Streams & Action Cable | RailsConf2023
kevinliebholz
34
6k
YesSQL, Process and Tooling at Scale
rocio
173
14k
Transcript
Async Processing for Fun and Profit Mike Perham @mperham
Me Director of Engineering, TheClymb.com
Agenda • Basics • Protips • Sidekiq
Why? • User-Perceived Performance • I/O is SLOOOOOOOOOOOW • I/O
is unreliable
What? • Optional work • Anything not required to build
the HTTP response
How? • Client puts message on a queue • Server
pulls message off queue • Worker executes code based on message
How? async do # perform some work end
How? • Marshalling a Proc • Need to serialize closure
How? async(instance, :method, args)
How? • Marshal instance • Marshal args
How? async(Class, :method, args)
How? • Serialize just the class name • Marshal the
arguments
Congratulations! This is exactly how Resque and Sidekiq work.
How?
How?
How?
Tip #1 Small, Stateless Messages
Stateless • Database holds objects (nouns) • Queue holds actions
(verbs) • “Perform X on Object 123”
Avoid State • Bad • @user.delay.sync_images • Good • User.delay.sync_images(@user.id)
Simple Types • Small & Easy to read • Cross-platform
• Sidekiq / Resque use JSON
Debugging
Tip #2 Idempotent, Transactional Units of Work
Idempotent • Fancy computer science term • “Work can be
applied multiple times without changing the result beyond the initial application”
Idempotent • Canceling an order • Updating user’s email address
Not Idempotent! • Charging credit card • Sending email
Idempotent • Your code has bugs! • Sidekiq will retry
jobs that raise • Design jobs to be retried • e.g. verify you need to perform action before performing it
Transactional • Infinite credit?
Tip #3 Embrace Concurrency
Concurrency • Resque/DJ = 4 workers • Sidekiq = 100
workers • Mike, what is best in life?
“To crush their servers, see them smoking before you and
hear the lamentations of their admins.”
Concurrency • Use connection_pool gem to limit client connections •
Split work into small batches • 100 items => 10 jobs of 10 items
Concurrency • Thread safety rarely an issue • Most gem
maintainers very responsive • Recently fixed: • cocaine, typheuos
Theory, meet Practice
Sidekiq • Simple, efficient message processing • Like Resque, but
10x faster
MODERN RUBY IS NOT SLOW SINGLE THREADING IS SLOW
Concurrency • To scale single-threaded, create lots of processes. •
HORRIBLY RAM INEFFICIENT
Threads vs Processes • Example: 400MB single-threaded process • 25
processes = 10GB RAM = EC2 xlarge • 25 threads = 1GB RAM = EC2 small • $60/month vs $480/month • 160 dynos => 10 dynos • 150 dynos * $35/month =~ $5000/month
Quick Rant • GIL + poor GC • C extension
API must DIE • What’s larger: 50% or 800%?
Client Your App Client Middleware Redis Sidekiq Client API Rails
Process
Server Processor Server Middleware Redis Worker Sidekiq Process Processor Server
Middleware Worker Processor Server Middleware Worker Processor Server Middleware Worker Fetcher Manager
Versions • Sidekiq - Free, LGPLv3 • Sidekiq Pro -
more features, support, $ • motivation!
Features Sidekiq Resque DJ Concurrency Store Hooks Web UI Scheduler
Retry Delay Batches Threads Processes Processes Redis Redis DB middleware callbacks callbacks ✓ ✓ ? ✓ ? ✓ ✓ ? ✓ ✓ ? ✓ Pro ? - ? - optional
Future • Nicer, more functional Web UI • APIs for
managing queues / retries • Rails 4 Queue API
Pro Future • Enterprise-y features • Workflow • Notifications
Conclusion • small, stateless messages • idempotent / transactional •
concurrency • sidekiq
Questions? @mperham
[email protected]