Upgrade to Pro — share decks privately, control downloads, hide ads and more …

Instruments: Leaks by Trevor Brown

Sponsored · SiteGround - Reliable hosting with speed, security, and support you can count on. →
Avatar for Triangle Cocoa Triangle Cocoa
September 27, 2012
Programming
180
5

Instruments: Leaks by Trevor Brown

Trevor discusses using the leaks tool in Instruments from CocoaHeads September in Durham

Avatar for Triangle Cocoa

Triangle Cocoa

September 27, 2012

More Decks by Triangle Cocoa

See All by Triangle Cocoa
App Store Secrets by Lawrence Ingraham
Avatar for Triangle Cocoa trianglecocoa
1
340
iPhone 5 and You! by Ameir Al-Zoubi
Avatar for Triangle Cocoa trianglecocoa
0
220
Grand Central Dispatch by Jody Hagins
Avatar for Triangle Cocoa trianglecocoa
2
520
Foundation Collections by Kevin Conner
Avatar for Triangle Cocoa trianglecocoa
3
290
Multithreaded Drawing by Eric Lanz
Avatar for Triangle Cocoa trianglecocoa
3
240
Unburdened ViewControllers by Jay Thrash
Avatar for Triangle Cocoa trianglecocoa
9
11k
Automated Acceptance Testing by Josh Johnson
Avatar for Triangle Cocoa trianglecocoa
4
210
Understanding UIResponder by Dirk Smith
Avatar for Triangle Cocoa trianglecocoa
5
400
Taming Xcode by Jay Thrash
Avatar for Triangle Cocoa trianglecocoa
3
180

Other Decks in Programming

See All in Programming
プロポーザルを書いてもらう
Avatar for pvcresin pvcresin
0
580
AIに既存システムを理解させる技術　～レガシーを見捨てないハーネスエンジニアリング入門～
Avatar for Ochtum ochtum
0
150
typoなんかねぇよ
Avatar for らすぴー raspython3
0
550
Go 1.27からのGODEBUG / Go 1.27 リリースパーティ #go127party
Avatar for mazrean mazrean
0
220
メールのエイリアス機能を履き違えない
Avatar for 船長（せんちょう） isshinfunada
0
260
ALB ログから Trace を気合で繋げる技術
Avatar for Hayato Kawai fohte
6
640
そこに3びきプロダクトがいるじゃろう——生成AI時代における“価値が届かない理由”の構造
Avatar for kosuke T kosuket
0
580
「人を評価する AI」の 設計と実装 
Avatar for 奈良亮耶 ryoyanara
0
240
複数の Claude Code が"放置"されてしまう問題をCLI ダッシュボードを自作して解決した話
Avatar for sumihiro3 sumihiro3
1
730
自動化したのに回らない テスト運用の壁 ―AI時代の品質責任と生産性
Avatar for Masahiko Funaki(舟木 将彦) mfunaki
0
510
生成AIで帳票OCRが「簡単に」作れる時代になった？
Avatar for Shohei Kondo kon_shou
0
1.2k
Detecting Compromised CI with eBPF and Cilium Tetragon
Avatar for Liz Rice lizrice
0
260

Featured

See All Featured
Responsive Adventures: Dirty Tricks From The Dark Corners of Front-End
Avatar for Vitaly Friedman smashingmag
254
22k
Visualization
Avatar for Eitan Lees eitanlees
152
17k
Save Time (by Creating Custom Rails Generators)
Avatar for Garrett Dimon garrettdimon
PRO
32
4.5k
Improving Core Web Vitals using Speculation Rules API
Avatar for Sergey Chernyshev sergeychernyshev
21
1.6k
Odyssey Design
Avatar for Ryan Kendrick rkendrick25
PRO
2
780
Build your cross-platform service in a week with App Engine
Avatar for Jose L jlugia
234
19k
What’s in a name? Adding method to the madness
Avatar for The Alliance productmarketing
PRO
24
4.1k
職位にかかわらず全員がリーダーシップを発揮するチーム作り / Building a team where everyone can demonstrate leadership regardless of position
Avatar for MADOX madoxten
64
56k
Chrome DevTools: State of the Union 2024 - Debugging React & Beyond
Avatar for Addy Osmani addyosmani
10
1.3k
Highjacked: Video Game Concept Design
Avatar for Ryan Kendrick rkendrick25
PRO
1
440
The SEO Collaboration Effect
Avatar for Kristina Bergwall kristinabergwall1
1
530
Reflections from 52 weeks, 52 projects
Avatar for Jefferson Lam jeffersonlam
356
21k

Transcript

  1. INSTRUMENTS: LEAKS Trevor Brown Triangle CocoaHeads September 2012

  2. What are leaks? How can we detect them? How can

    we prevent them? Q&A Resources

  3. Memory that... has been consumed (allocated), is no longer needed,

    but cannot be returned to the OS for reuse or accessed by the program that allocated it. Is there a problem with that? Waste of resources Slowdown (unresponsive) Unexpected shutdown by OS WHAT ARE LEAKS? (and why they’re bad)

  4. HOW CAN WE DETECT LEAKS? Static Analyzer (Xcode) Instruments Code

    review

  5. Launch your app with the profiler

  6. None
  7. None
  8. None
  9. None
  10. None

  11. Random audience member: “Thanks for the total waste of time,

    Trevor. I use ARC. Like, all the time. Wow... Um, beer, anyone?”

  12. RETAIN CYCLE

  13. Object A Object B RETAIN CYCLE

  14. None

  15. LEAK PREVENTION Use ARC (convert) Avoid retain cycles (no strong-strong

    relationships) Handle low-memory warnings from the OS Run the static analyzer

  16. QUESTIONS?

  17. RESOURCES Performing static code analysis Instruments User Guide ARC transition

    notes

  18. THANK YOU!