Rick Blalock: Your Apps are Leaking - Controlling Memory Leaks
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Developing large-scale Titanium apps can be tricky. Although Titanium manages memory on the native level for developers, care and attention on memory management and profiling techniques must be used in order to ensure their javascript is optimial. Attendees will learn how to detect memory leak / retention issues caused by client-side code. They will learn how to utilize tools and techniques such as Instruments / DDMS, proper architectural patterns, and more to produce performant apps. Appcelerator's Rick Blalock leads this session for developers who have a a strong grasp of Titanium but want to learn how to profile and improve the apps they build.
Rick Blalock: Your Apps are Leaking - Controlling Memory Leaks
- 1. Your Apps are Leaking: App Profiling and More Rick Blalock
- 2. What We’ll Cover - Common Javascript leaks - Performance - Introduction to XCode Instruments - How to narrow down leaks in your code - Introduction to DDMS (if time allows) Project Files: https://github.com/rblalock/codestrong2011_appleak 2
- 4. Anti-Patterns Don’t assume win.close() releases memory! Global objects will always hang around 4
- 5. Anti-Patterns What about doing something like: someNameSpace.win = null; Even setting the window to null will not release the global objects 5
- 6. Anti-Patterns If you insist on having objects in some global namespace then do this: This is still not ideal 6
- 7. Don’t Do This! Local variables referenced inside a global event will cause a memory leak every time 7
- 8. Performance 8
- 9. Needless Execution No point in The biggest Especially bad processing performance hit when done in something that will be on several included isn’t going to be Android files in app.js used yet Don’t execute code until you need it 9
- 10. Mass Includes Avoid including large amounts of files in app.js. Include files as you need them. 10
- 11. Mass Includes 11
- 12. Mass Includes 12
- 13. XCode’s Instruments 13
- 14. Brief Overview Living Live objects using resources Transitory Objects that have been collected Overall The sum of both columns above 14
- 15. Brief Overview Filter by these keywords to help find issues: proxy Ti TiUI 15
- 16. Demo 16