Memory Management For

Android Apps

Who am I ?

Faculty at Aiti-Aptech

Android leader at Zoo Studio

What will I share today ?

Heap size

Garbage Collection

Bitmap management

290 MB

2GB

Heap size

Heap size Limits.

G1 : 16MB

Nexus One : 32MB

Galaxy S3 : 64MB

Heap size

Honeycomb (3.0) support option : “largetHeap” ActivityManager.getLargeMemoryClass()

Garbage Collection

Garbage Collection

Bigger heaps = longer pauses

Pre- Gingerbread Stop all application Pause time > 100ms

Gingerbread and beyond Concurrent Pause times < 5ms

Bitmap

Pre Android 2.3 Freed via recycle() Full, Stop the world GCs

Bitmap

> Android 2.3 Freed synchronously by GC Concurrent & partial GCs

GC_FOR_ALLOC freed <1K, 5% free 4961K/5176K, paused 13ms, total 13ms

GC_CONCURRENT freed 0K, 5% free 4961K/5176K, paused 8ms+0ms, total 10ms

GC_FOR_ALLOC freed 2418K, 45% free 3192K/5788K, paused 1ms, total 1ms

References

http://android-developers.blogspot.com/2011/03/memory-analysis-for-android.html.

http://kohlerm.blogspot.com/2009/02/memory-leaks-are-easy-to-find.html

http://developer.android.com/training/displaying-bitmaps/manage-memory.html

Thank you !!!

Email : vietbq@moneylover.me