Instruments: Leaks by Trevor Brown

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

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
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
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!