Upgrade to Pro — share decks privately, control downloads, hide ads and more …
Sign up for free

Instruments: Leaks by Trevor Brown

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
350
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
530
Foundation Collections by Kevin Conner
Avatar for Triangle Cocoa trianglecocoa
3
290
Multithreaded Drawing by Eric Lanz
Avatar for Triangle Cocoa trianglecocoa
3
250
Unburdened ViewControllers by Jay Thrash
Avatar for Triangle Cocoa trianglecocoa
9
11k
Automated Acceptance Testing by Josh Johnson
Avatar for Triangle Cocoa trianglecocoa
4
220
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
カツオ、ご期待ください
Avatar for saku_totomi suneo3476
0
100
Ghostty + Neovimで作る 透明でカッコ良い開発環境
Avatar for Kanade Nonomura j341nono
0
130
新卒PdEのリアル
Avatar for ryu ryu1013
1
520
速習iPhone Duo対応
Avatar for 野瀬田　裕樹 yuukiw00w
2
810
SREの越境 / SRE Collaboration
Avatar for y-ohgi y0hgi
2
280
更なる可用性を求めて、5年間運用したKotlinのアプリケーションをGoでリプレイスする話
Avatar for Kensuke Taguchi ken_tunc
0
370
Go × SIMDで高速化するベクトル検索 ~ルーフラインモデルでSIMDが効く境界を探れ！ ~
Avatar for po3rin po3rin
1
3.6k
速く作れる。その次は、速く確かめられる開発へ 〜AIネイティブ開発を支える、Shift Down〜 / Can build fast. Next, moving to development where we can verify fast.
Avatar for r-kagaya rkaga
6
4.7k
大喜利で理解するLLM as a Judge / Understanding LLM-as-a-Judge through Ogiri
Avatar for rockname rockname
0
160
Verilogで学ぶCPU自作入門.pdf
Avatar for uyuki uyuki234
8
3.3k
iOSDC2026登壇資料.pdf
Avatar for RioFujimon riofujimon
0
190
JAWS-UG 東京支部が始める、JAWS-UG支部コラボ / JAWS-UG lunchtime LT Collaboration
Avatar for y-ohgi y0hgi
0
140

Featured

See All Featured
The Curse of the Amulet
Avatar for Matthew Lei leimatthew05
3
15k
Highjacked: Video Game Concept Design
Avatar for Ryan Kendrick rkendrick25
PRO
1
460
Neural Spatial Audio Processing for Sound Field Analysis and Control
Avatar for NII S. Koyama's Lab skoyamalab
0
520
ReactJS: Keep Simple. Everything can be a component!
Avatar for Pedro Nauck pedronauck
666
130k
How to build an LLM SEO readiness audit: a practical framework
Avatar for Nick Samuel nmsamuel
1
920
How to Talk to Developers About Accessibility
Avatar for Jason CranfordTeague jct
2
550
AI Search:
Where Are We & What Can We Do About It?
Avatar for Aleyda Solis aleyda
0
8k
Building a Scalable Design System with Sketch
Avatar for Laura Van Doore lauravandoore
464
34k
Cheating the UX When There Is Nothing More to Optimize - PixelPioneers
Avatar for Stéphanie Walter stephaniewalter
287
14k
Navigating the Design Leadership Dip - Product Design Week Design Leaders+ Conference 2024
Avatar for Andy Polaine apolaine
2
450
Jess Joyce - The Pitfalls of Following Frameworks
Avatar for Tech SEO Connect techseoconnect
PRO
1
420
Between Models and Reality
Avatar for mayunak mayunak
4
470

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!