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

Instruments: Leaks by Trevor Brown

Sponsored · Ship Features Fearlessly Turn features on and off without deploys. Used by thousands of Ruby developers. →
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
310
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
atmaCup #23でAIコーディングを活用した話
Avatar for ML_Bear ml_bear
4
740
nilとは何か 〜interfaceの構造とnil!=nilから理解する〜
Avatar for kuro kuro_kurorrr
3
1.6k
JPUG勉強会 OSSデータベースの内部構造を理解しよう
Avatar for Atsushi Ogawa oga5
2
230
TROCCOで実現するkintone+BigQueryによるオペレーション改善
Avatar for shota sato ssxota
0
140
Claude Code の Skill で複雑な既存仕様をすっきり整理しよう
Avatar for yuichiro_takahashi yuichirokato
1
300
ふつうの Rubyist、ちいさなデバイス、大きな一年
Avatar for bash0C7 bash0c7
0
580
浮動小数の比較について
Avatar for Kishikawa Katsumi kishikawakatsumi
0
380
メタプログラミングで実現する「コードを仕様にする」仕組み/nikkei-tech-talk43
Avatar for 日本経済新聞社 エンジニア採用事務局 nikkei_engineer_recruiting
0
160
RAGでハマりがちな"Excelの罠"を、データの構造化で突破する
Avatar for harumi harumiweb
9
2.5k
encoding/json/v2のUnmarshalはこう変わった：内部実装で見る設計改善
Avatar for Hiroki Kurasawa kurakura0916
0
310
今、アーキテクトとして 品質保証にどう関わるか
Avatar for Nealle nealle
0
200
「やめとこ」がなくなった — 1月にZennを始めて22本書いた AI共創開発のリアル
Avatar for atani atani14
0
350

Featured

See All Featured
The AI Search Optimization Roadmap by Aleyda Solis
Avatar for Aleyda Solis aleyda
1
5.4k
Navigating the Design Leadership Dip - Product Design Week Design Leaders+ Conference 2024
Avatar for Andy Polaine apolaine
0
220
First, design no harm
Avatar for Per Axbom axbom
PRO
2
1.1k
The Curious Case for Waylosing
Avatar for Cassini Nazir cassininazir
0
260
Principles of Awesome APIs and How to Build Them.
Avatar for Keavy McMinn keavy
128
17k
Designing Powerful Visuals for Engaging Learning
Avatar for Mike Taylor tmiket
0
260
Music & Morning Musume
Avatar for Bryan Veloso bryan
47
7.1k
Helping Users Find Their Own Way: Creating Modern Search Experiences
Avatar for Dan Newman danielanewman
31
3.1k
Mobile First: as difficult as doing things right
Avatar for Swwweet swwweet
225
10k
Exploring anti-patterns in Rails
Avatar for Elle Meredith aemeredith
2
280
AI Search:
Where Are We & What Can We Do About It?
Avatar for Aleyda Solis aleyda
0
7.1k
A designer walks into a library…
Avatar for Paul Jervis Heath pauljervisheath
210
24k

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!