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Extracts from "Memory Management for Android Apps"
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David Wu
July 06, 2011
Programming
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Extracts from "Memory Management for Android Apps"
Extracts from "Memory Management for Android Apps"
David Wu
July 06, 2011
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Transcript
Extracts from "Memory Management for Android Apps" Taipei GTUG 20110706
Meetup (http://goo.gl/VdfLK) Original Presenter Patrick Dubroy @dubroy Extract Presenter David Wu @wuman blog.wu-man.com
2 @wuman David Wu david@wu-man.com blog.wu-man.com
#tossug, #h4 HTC
3 In 10 Minutes...
4 Purpose Avoid OOM errors
5 Breakdown API Changes Heap size Garbage collection
Bitmap allocations Understanding heap usage Memory leaks Logcat Memory Analyzer (MAT)
6 Heap Size Heap size limits G1: 16MB
Droid: 24MB Nexus One: 32MB Xoom: 48MB ActivityManager.getMemoryClass()
7 Large Heaps <application android:name=”com.example.foobar” andorid:largeHeap=”true” … </application>
8 Garbage Collection
9 Garbage Collection
10 Garbage Collection
11 Garbage Collection
12 Garbage Collection < Gingerbread Stop-the-world Full
heap collection Pause times often > 100ms >= Gingerbread Concurrent (mostly) Partial collections Pause times usually < 5ms
13 Bitmaps (Old)
14 Bitmaps (New)
15 Memory Leaks
16 Logcat
17 Logcat
18 Logcat
19 Logcat
20 Logcat
21 Logcat
22 Heap Dumps Create with DDMS andorid.os.Debug.dumpHprofData()
Conversion hprof-conv orig.hprof converted.hprof Analyze with MAT
23 Shallow and Retained Heap
24 Dominator Tree
25 Demo Debugging a memory leak with MAT
26 Demo
27 References Video of the session http://goo.gl/KRrx7 Original
slides http://goo.gl/0RqIZ Patrick Dubroy's blog http://dubroy.com/blog/