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Of Bytes, Cycles and Battery Life

Of Bytes, Cycles and Battery Life. Who am I?. [2]. [1]. @ badlogicgames http:// www.badlogicgames.com. What i‘ll talk about. How to reduce your APK size Memory Analysis Tools Performance Analysis Tools. How to reduce your APK size. Reduce asset size p ngcrush your PNGs [3]

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Of Bytes, Cycles and Battery Life

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  1. Of Bytes, CyclesandBattery Life

  2. Who am I? [2] [1] @badlogicgames http://www.badlogicgames.com

  3. Whati‘lltalkabout • Howtoreduceyour APK size • Memory Analysis Tools • Performance Analysis Tools

  4. Howtoreduceyour APK size • Reduceassetsize • pngcrushyour PNGs [3] • SVG (YMMV) [4] • lower bit-rates foraudio • Reducecodesize • Remove unnecessarydependencies! • Proguard, for Class files [5] [6] • Dexguard, forDexfiles [7]

  5. „But i can‘treducemy APK size“ • Multiple-APKs tothe „rescue“ [8] • One APK per screendensity • One APK per texturecompressionalgorithm • Use Google Play filters • EasierwithnewAndroidGradlebuildsystem • APK Expansion files [9] • hostedby Google • Roll yourown „Expansion files“ • Avoidifyoucan!

  6. Memory Analysis Tools • „But wehave a GarbageCollector!“ • Youcan still „leak“ memory • Nastystaticvarsreferencingunusedobjects • Hidden objectreferences • Native memoryallocatedby Java classes • Ifyouwritegames, GC killsyoursteady framerate

  7. DDMS [10] Heap View

  8. DDMS AllocationTracker

  9. HPROF/Eclipse MAT [11] • Select theprocess • Click • Save to a locationofyourchoice • Convertto „real“ HPROF file • Open in Eclipse MAT [12]

  10. HPROF/Eclipse MAT

  11. HPROF/Eclipse MAT

  12. HPROF/Eclipse MAT

  13. Performance Analysis Tools • Why do wewanttoanalyse? • Jerkyanimations • Do less, conservebattery • Betteruser Experience • What do wewanttoanalyse? • Time spent in Java code • Time spent in Native code • Time spentdrawingstuff

  14. Beforewestart... • Never usetheemulator! • Ever, thinkofthekittens • Identifyhotspots in yourapp, not in microbenchmarks • Onlyspend time ifyouhave a real problem

  15. Java Profilers • DDMS • Quitecapablemethodlevelprofiler • Goodenoughfor 99% ofusecases • Works withanyAndroidversion • 4.1+ Profilingtools • Systrace [13], More powerful, also tracks OS calls • Needs rootandAndroid 4.1+ • We‘llcheck out thegraphicalpartslater

  16. DDMS • Start app • Navigatetoproblematicactivity, hit • Wait a bit, hit • View profilingdata • Ignore absolute time, onlycarefor relative timings • Ignore trivial getters/setters, instrumentationmesseswithtimings

  17. DDMS

  18. Native Code Profilers • Android NDK Profiler [14] • Not an official NDK tool • Setup a bitinvolved • Device specific CPU profilers • NVIDIA Nsight [15], ... • Roll yourown • Instrument manually • Track down hotspots

  19. Graphics Profilers • What do weanalyse? • Overdraw, yourbiggestenemy • Draw calls, yoursecondbiggestenemy • Use DDMS/systrace • Relatedtomemory • Textures on VRAM (whichisusually RAM) • Bitmaps in RAM

  20. Graphics Profilers • 4.1+ Profilingtools • GPU VendorSpecific • NVIDIA [16], Qualcomm [17], Imagination Technologies [18] • Outside ofscopeofthistalk

  21. VisualizeOverdraw [19]

  22. VisualizeOverdraw • Normal Color – 0 Overdraw • Blue – 1x Overdraw • Green – 2x Overdraw • Light Red– 3x Overdraw • Dark Red– +4x Overdraw

  23. VisualizeOverdraw • Hierarchy View [20] • Window -> Open Perspective -> Other...

  24. VisualizeOverdraw

  25. VisualizeOverdraw • Tracer for OpenGL [21] • Window -> Open Perspective -> Other ... • Click • Enterpackagename • Wait

  26. VisualizeOverdraw

  27. VisualizeOverdraw

  28. Closing Words • So muchtotell, so little time • See Dalvik Performance Tips [22] • Read all references • Yourusers will thankyouforexcellentbatterylifeandbuttery smooth UIs

  29. FIN Thanksfor Listening Questions?

  30. References [1] http://www.amazon.com/Beginning-Android-Games-Mario-Zechner/dp/1430246774 [2] http://libgdx.badlogicgames.com/ [3] http://pmt.sourceforge.net/pngcrush/ [4] https://code.google.com/p/svg-android/ [5] http://developer.android.com/tools/help/proguard.html [6] http://proguard.sourceforge.net/index.html [7] http://www.saikoa.com/dexguard [8] http://developer.android.com/google/play/publishing/multiple-apks.html [9] http://developer.android.com/google/play/expansion-files.html [10] http://developer.android.com/tools/debugging/ddms.html [11] http://android-developers.blogspot.co.at/2011/03/memory-analysis-for-android.html

  31. References [12] http://www.eclipse.org/mat/ [13] http://developer.android.com/tools/help/systrace.html [14] https://code.google.com/p/android-ndk-profiler/ [15] http://www.nvidia.com/object/nsight.html [16] https://developer.nvidia.com/tegra-profiler [17] https://developer.qualcomm.com/mobile-development/mobile-technologies/gaming-graphics-optimization-adreno/tools-and-resources [18] http://www.imgtec.com/powervr/insider/sdkdownloads/ [19] http://www.curious-creature.org/2012/12/01/android-performance-case-study/ [20] http://developer.android.com/tools/debugging/debugging-ui.html [21] http://developer.android.com/tools/help/gltracer.html [22] http://developer.android.com/training/articles/perf-tips.html

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