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

Instruments: Leaks by Trevor Brown

Sponsored · Your Podcast. Everywhere. Effortlessly. Share. Educate. Inspire. Entertain. You do you. We'll handle the rest. →
Avatar for Triangle Cocoa Triangle Cocoa
September 27, 2012
Programming
5
170

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
Tweet

More Decks by Triangle Cocoa

See All by Triangle Cocoa
App Store Secrets by Lawrence Ingraham
Avatar for Triangle Cocoa trianglecocoa
1
300
iPhone 5 and You! by Ameir Al-Zoubi
Avatar for Triangle Cocoa trianglecocoa
0
200
Grand Central Dispatch by Jody Hagins
Avatar for Triangle Cocoa trianglecocoa
2
500
Foundation Collections by Kevin Conner
Avatar for Triangle Cocoa trianglecocoa
3
270
Multithreaded Drawing by Eric Lanz
Avatar for Triangle Cocoa trianglecocoa
3
230
Unburdened ViewControllers by Jay Thrash
Avatar for Triangle Cocoa trianglecocoa
9
11k
Automated Acceptance Testing by Josh Johnson
Avatar for Triangle Cocoa trianglecocoa
4
190
Understanding UIResponder by Dirk Smith
Avatar for Triangle Cocoa trianglecocoa
5
350
Taming Xcode by Jay Thrash
Avatar for Triangle Cocoa trianglecocoa
3
160

Other Decks in Programming

See All in Programming
CSC307 Lecture 04
Avatar for Javier Gonzalez-Sanchez javiergs
PRO
0
660
高速開発のためのコード整理術
Avatar for sutetotanuki sutetotanuki
1
410
CSC307 Lecture 06
Avatar for Javier Gonzalez-Sanchez javiergs
PRO
0
690
例外処理とどう使い分ける？Result型を使ったエラー設計 #burikaigi
Avatar for Takuma Kajikawa kajitack
16
6.1k
Oxlint JS plugins
Avatar for kazupon kazupon
1
980
FOSDEM 2026: STUNMESH-go: Building P2P WireGuard Mesh Without Self-Hosted Infrastructure
Avatar for Date Huang tjjh89017
0
170
Architectural Extensions
Avatar for Denys Poltorak denyspoltorak
0
300
Package Management Learnings from Homebrew
Avatar for Mike McQuaid mikemcquaid
0
230
CSC307 Lecture 07
Avatar for Javier Gonzalez-Sanchez javiergs
PRO
1
560
Data-Centric Kaggle
Avatar for ねぼすけAI isax1015
2
780
AIエージェント、”どう作るか”で差は出るか？ / AI Agents: Does the "How" Make a Difference?
Avatar for r-kagaya rkaga
4
2k
登壇資料を作る時に意識していること #登壇資料_findy
Avatar for konifar konifar
4
1.6k

Featured

See All Featured
Music & Morning Musume
Avatar for Bryan Veloso bryan
47
7.1k
Speed Design
Avatar for Sergey Chernyshev sergeychernyshev
33
1.5k
We Are The Robots
Avatar for Honza Javorek honzajavorek
0
170
The SEO Collaboration Effect
Avatar for Kristina Bergwall kristinabergwall1
0
350
A better future with KSS
Avatar for Kyle Neath kneath
240
18k
How To Speak Unicorn (iThemes Webinar)
Avatar for Michelle Schulp Hunt marktimemedia
1
380
Producing Creativity
Avatar for Steve Smith orderedlist
PRO
348
40k
Visualizing Your Data: Incorporating Mongo into Loggly Infrastructure
Avatar for mongodb mongodb
49
9.9k
Save Time (by Creating Custom Rails Generators)
Avatar for Garrett Dimon garrettdimon
PRO
32
2.1k
Thoughts on Productivity
Avatar for Jon Yablonski jonyablonski
74
5k
AI: The stuff that nobody shows you
Avatar for John Nunemaker jnunemaker
PRO
2
270
Building AI with AI
Avatar for Ines Montani inesmontani
PRO
1
700

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!