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

Instruments: Leaks by Trevor Brown

Avatar for Triangle Cocoa Triangle Cocoa
September 27, 2012
Programming
170
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
210
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
390
Taming Xcode by Jay Thrash
Avatar for Triangle Cocoa trianglecocoa
3
180

Other Decks in Programming

See All in Programming
アルゴリズムは何を圧縮しているのか ─ Haskell から育った「圧縮代数」というメンタルモデル
Avatar for Naoya Ito naoya
16
3.8k
Prismを使った型安全な暗号化_関数型まつり2026
Avatar for _fhhmm _fhhmm
0
160
AIが無かった頃の素敵な出会いの話
Avatar for コドモン開発チーム codmoninc
1
350
壊れたパーサから始める関数型設計と構成的なパーサ #fp_matsuri
Avatar for ライガー raiga0310
2
430
琵琶湖の水は止められてもNet--HTTPのリトライは止められない / You might be able to stop the water flow of Lake Biwa but you can't stop Net::HTTP retries
Avatar for luccafort luccafort
PRO
0
520
Foundation Models frameworkで画像分析
Avatar for リョウ ryodeveloper
1
420
Terraform標準の組織で AWS CDKをどう使うか
Avatar for mu7889yoon / Yuta Nakamura mu7889yoon
1
450
AIエージェントで 変わるAndroid開発環境
Avatar for takahirom takahirom
2
760
属人化した知識を、 AIが辿れる地図にする
Avatar for PKSHA Technology（パークシャテクノロジー） pkshadeck
PRO
1
130
テーブルをDELETEした
Avatar for yuzneri yuzneri
0
130
【やさしく解説 設計編・中級 #4】ルールの寿命と、システムの年輪
Avatar for HideyukiKitao panda728
PRO
2
180
React本体のコードリーディング
Avatar for high-g high_g_engineer
1
130

Featured

See All Featured
Navigating the Design Leadership Dip - Product Design Week Design Leaders+ Conference 2024
Avatar for Andy Polaine apolaine
1
380
Easily Structure & Communicate Ideas using Wireframe
Avatar for Afnizar Nur Ghifari afnizarnur
194
17k
Believing is Seeing
Avatar for Spiro Bolos oripsolob
1
180
GraphQLとの向き合い方2022年版
Avatar for Yosuke Kurami quramy
50
15k
The AI Revolution Will Not Be Monopolized: How open-source beats economies of scale, even for LLMs
Avatar for Ines Montani inesmontani
PRO
3
3.7k
How to Think Like a Performance Engineer
Avatar for Harry Roberts csswizardry
28
2.7k
How To Speak Unicorn (iThemes Webinar)
Avatar for Michelle Schulp Hunt marktimemedia
1
520
How to Build an AI Search Optimization Roadmap - Criteria and Steps to Take #SEOIRL
Avatar for Aleyda Solis aleyda
1
2.1k
Building an army of robots
Avatar for Kyle Neath kneath
306
46k
KATA
Avatar for Megan Lloyd mclloyd
PRO
35
15k
Let's Do A Bunch of Simple Stuff to Make Websites Faster
Avatar for Chris Coyier chriscoyier
508
140k
Highjacked: Video Game Concept Design
Avatar for Ryan Kendrick rkendrick25
PRO
1
420

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!