Android performance tuning. Memory.

1. ANDROID
PERFORMANCE
TUNING
MEMORY
SERGII KOZYREV
Senior SE
22.06.2016

2. Memory

3. Garbage Collector is such a cool
feature

4. There is always taxes -
“performance is not free”? :)

5. Understanding memory
•GC
•Find objects that can’t be accessed
•Reclaim the resources
•Questions:
•Heap vs Stack memory?
•What GC collects?
•How leaks happens?

6. Concerns

7. Memory Leaks
•It’s not only about OutOfMemoryError
•It reduces available memory and causes GC run more frequent - which is
bad

8. Different VMs – different Logs
•Dalvik (every GC)
•ART (if the GC pause exceeds
than 5ms or the GC duration
exceeds 100ms)
Concurrent VS Alloc

9. DEMO Memory Monitor

10. Memory Leaks
•Simple - “handler case”, or every circular referenced objects
•Complex - holding a handle to the ClassLoader objects, load
in onCreate and don’t check if classes already loaded (no
class unload procedure)

11. Memory Leaks
•Static Activities, Views, Context aware stuff
•Inner Classes
•Anonymous Classes
•Handlers
•Threads and TimerTask
•Sensor Manager

12. DEMO HeapViewver

13. Move allocations out of inner loops
:)

14. DEMO Allocation Tracker

15. Thank You!

16. Links:
https://github.com/kozyrevsergey89/PerformanceLab
https://github.com/square/leakcanary
https://www.udacity.com/course/android-performance--ud825