Androidにおけるパフォーマンスチューニング実践

再現性が低い改善が難しいパフォーマンス問題に対処するために、パフォーマンスの前提知識をつけ、定性と定量との両輪からアプローチしていく方法論に関して話しています。

- パフォーマンス改善の発端
- アプリパフォーマンスの定義
- パフォーマンス課題
- UIの改善
- データ通信量
- バッテリー消費

Transcript

1. "OESPJEʹ͓͚Δ
   ύϑΥʔϚϯενϡʔχϯά࣮ફ @neonankiti
2. גࣜձࣾFiNC Technologies — Mobile Engineer(Android/iOS/Flutter) ೆཬ༐ؾ @neonankiti #εϊϘʔ #όεέ #Ωϟϯϓ #௼Γ #GoldGym ࣗݾ঺հ
3. ύϑΥʔϚϯε՝୊ͷࢦఠ CTO ΞϓϦͷಈ࡞͓΋ͳ͍ʁ͸΍ͯ͘͠΍ɻ Θ͔Γ·ͨ͠ʂʂ σʔλফඅྔ΍͹͘ͳ͍ʁ௚ͯ͠΍ɻ ΊͬͪΌి஑৯ͬͯͳ͍ʂʁʂʁʂ
4. ͳΜ͔Θ͔ΒΜ͚Ͳɺ΍ͬͯΈΔ͔
5. νʔϜͷ࠶ฤ੒ Before After ػೳ1 ػೳ2 ػೳ3 ػೳ1 ػೳ2 ػೳ3 ڞ ௨ ج ൫
6. ڞ௨ج൫νʔϜര஀
7. ͳͥνʔϜΛ࠶ฤ੒ͨ͠ͷ͔ʁ νʔϜମ੍͸ػೳ(υϝΠϯ)୯Ґ →ػೳ୯ҐͰ͸੹೚͕ᐆດͳ໰୊͕ੜ͡Δ
8. ۩ମతʹى͖ͨ໰୊ ɾݪҼͷΘ͔Γਏ͍Ϋϥογϡ ɾσʔλ௨৴ྔͷ૿Ճ ɾόοςϦʔফඅͷ૿Ճ ɾͳΜ͔΋ͬ͞Γͯ͠Δ
9. ڞ௨ج൫νʔϜͷൃ଍΁ ಛఆͷػೳʹґଘ͠ͳ͍໰୊Λվળ͠ ΞϓϦͷ඼࣭ΛߴΊΔ͜ͱ͕੹຿
10. RailsςοΩʔͳ࿩
    ϚΠΫϩαʔϏεͷཁૉٕज़ͷ࿩
    Ϛωδϝϯτͷ࿩ ΞϓϦύϑΥʔϚϯεվળͷલʹ
11. ΞϓϦύϑΥʔϚϯεͱ͸ʁ
12. ϢʔβʔମݧʹӨڹΛ༩͑Δཁૉ ɾΫϥογϡ ɾANR ɾσʔλϩʔυ ɾUI(Ξχϝʔγϣϯ) ɾόοςϦʔফඅ ɾσʔλ௨৴ྔ ΞϓϦύϑΥʔϚϯε
13. ϦϦʔεޙʹൃੜ͠΍͍͢ ݦࡏԽͷλΠϛϯά ϦϦʔε ςετ ʷ ύϑΥʔϚϯεѱԽ
14. ͳͥϦϦʔεޙʹൃੜ͠΍͍͢ͷ͔ʁ ςετͰͷ࠶ݱੑ͕೉͍͠ ɾຊ൪։ൃ2"؀ڥͷࠩҟ ɾ࣌ؒత੍໿Ͱػೳςετ͕ࠔ೉
15. ςετΑΓલͷϑϩʔͰରࡦ͢Δ ࣮૷࣌ʹՄೳͳݶΓࢭΊΔ ϦϦʔε ςετ ʷ ύϑΥʔϚϯεѱԽ ࣮૷
16. ΤϯδχΞ͕ग़དྷΔ͜ͱ ɾલఏͱͳΔ஌ࣝΛ͚ͭΔ ɾΞϯνύλʔϯΛ౿·ͳ͍࣮૷ ΞϓϦύϑΥʔϚϯεʹؔͯ͠
17. ຊ೔ͷτϐοΫ
18. ຊ೔࿩߲͢໨ ɾ6*ͷվળ ɾσʔλ௨৴ྔ ɾόοςϦʔফඅ ࠶ݱੑ͕೉͍߲͠໨
19. RailsςοΩʔͳ࿩
    ϚΠΫϩαʔϏεͷཁૉٕज़ͷ࿩
    Ϛωδϝϯτͷ࿩ ΞϓϦύϑΥʔϚϯενϡʔχϯά࣮ફ
20. ύϑΥʔϚϯενϡʔχϯά࣮ફ 6*ͷվળ σʔλ௨৴ྔ όοςϦʔফඅ
21. ɾ6*ͷΧΫπΩ UIͷ໰୊ ɾ$16
    (16ʹෛ୲Λ༩͑Δॲཧ
22. ɾ6*ͷΧΫπΩ UIͷ໰୊ ɾ$16
    (16ʹෛ୲Λ༩͑Δॲཧ
23. ͳͥ6*͸ΧΫπΫͷ͔ʁ
24. 'SBNF
    3BUF͕௿͍
25. ɾFPS = Frame Per Secondsɻ ɾਓؒ͸ɺ60FPS͕࠷దͱײ͡Δ Frame Rateͱ͸ ɾ60FPS ≒ 16ms/frame ≒1ඵؒʹॲཧ͞ΕΔϑϨʔϜ਺(੩ࢭը໘)
26. '14ͷ࣮ݱ
27. ΞϓϦͷىಈ = Linuxϓϩηεͷىಈ શͯͷλεΫ͸ϝΠϯεϨου(UIεϨου)Ͱ࣮ߦ UI Drawing LameWork App Events UI Drawing UI Drawing Main Thread(UI Thread) PROCESS AndroidΞϓϦͷ࣮ߦϓϩηε ࢀߟ
    IUUQTXXXZPVUVCFDPNXBUDI W)92IVRG576MJTU1-R@V8#8R:U7*S';8S#;D#@XG98
28. NTGSBNFΛӽ͑ͯ͠·͏ →Frame͕Drop͞ΕΔ 16ms UI Drawing LameWork App Events UI Drawing UI Drawing Main Thread(UI Thread) PROCESS 16ms 16ms Drop Over 16ms 60FPSͷࣦഊ
29. ɾλεΫΛNTGSBNFʹ཈͑Δ 60FPSͷ࣮ݱํ๏ ɾλεΫΛ෼ࢄ͢Δ
30. ɾωοτϫʔΫॲཧ 16ms/frameΛΦʔόʔ͠΍͍͢λεΫ ɾ*0ॲཧ ˠϝΠϯεϨουͱผεϨουͰ࣮ߦ
31. 1. εϨου(ҎޙϫʔΧʔεϨου)ͷੜ੒ 2. ϫʔΧʔεϨου্ͰλεΫ࣮ߦ 3. ݁ՌΛϝΠϯεϨου΁  Worker Thread Main Thread(UI Thread) Update some UI Prep some work Do some long work ϚϧνεϨοσΟϯά  
32. ɾϝϞϦ؅ཧϦʔΫ ϚϧνεϨοσΟϯάͷҰൠతͳίετ ɾεϨουੜ੒ͷΦʔόʔϔου
33. εϨουΛ͍ͭੜ੒͠ɺഁغ͢Δ͔͸ඞܾͣΊΔ ɾView͔Βͷࢀর(Activity) -> LeakCanaryͷར༻ ϝϞϦ؅ཧ/ϦʔΫରԠ ɾMemory Profilerͷར༻
34. Memory Profiler 1. ώʔϓɺϝϞϦྔͷλΠϜϥΠϯ 2. ಛఆͷλΠϛϯάͰͷΞϩέʔτ͞ΕͨΦϒδΣΫτ 1 2 ࢀߟ
    IUUQTEFWFMPQFSBOESPJEDPNTUVEJPQSPpMFNFNPSZQSPpMFS IMKB
35. ɾCPU Profileͷར༻ εϨουੜ੒ͷΦʔόʔϔουରԠ ɾεϨουੜ੒͸Φʔόʔϔουίετ͕ߴ͍ ɾεϨουࣗମΛݮΒ͢(࠷େݸ਺͸CPUʹґଘ) ɾ࠶ར༻(RxJava͸ThreadPoolΛར༻) ࢀߟ
    IUUQTEFWFMPQFSBOESPJEDPNTUVEJPQSPpMFDQVQSPpMFS IMKB
36. ɾ6*ͷΧΫπΩ UIͷ໰୊ ɾ$16
    (16ʹෛ୲Λ༩͑Δॲཧ
37. ϨϯμϦϯά
38. ɾը໘ͷσʔλ͸πϦʔߏ଄ AndroidϨϯμϦϯάͷಛ௃ ɾιϑτ΢ΣΞඳըͱϋʔυ΢ΣΞΞΫηϥϨʔγϣϯ
    Ҏޙ)8"
39. ɾτϥόʔαϧͳϓϩηεͷͨΊίετ͕ߴ͍ ϨϯμϦϯάͷίετ ɾ7JFXͷݺͼग़͠ ɾ਌͕ࢠΛଌఆ NFBTVSF 3PPU 7JFX 7JFX 7JFX 7JFX 7JFX 7JFX 7JFX ɾ࠶ؼత ɾSPPUͷαΠζ͕ܾఆ ɾը໘্ͷҐஔΛܾఆ MBZPVU ɾ༿ϊʔυͷҐஔ͕ܾఆ
40. ιϑτ΢ΣΞඳըͱHWA ɾ$16
    PS
    (16 ඳըํ๏ ιϑτ΢ΣΞඳը HWA Invalidate Canvas ผϨΠϠʔ શͯͷϊʔυʹӨڹ dirtyͷΈߋ৽
41. Πϝʔδ $BOWBT ιϑτ΢ΣΞඳը HWA →શߋ৽ →dirtyͷΈ $BOWBT ϋʔυ΢ΣΞ
    ϨΠϠʔ dirty
42. ɾਂ͍View֊૚ ɾιϑτ΢ΣΞඳըʹ͓͚ΔonDraw() ɾOverdrawingʹΑΔGPU࣌ؒͷফඅ ࣮૷্ͷ໰୊
43. Ұ୴πʔϧΛ࢖ͬͯΈΔ
44. ɾ։ൃऀΦϓγϣϯ ɹɾGPUϨϯμϦϯάͷϓϩϑΝΠϧ࡞੒ ɹɾGPUΦʔόʔυϩʔΛσόοά ɹɾGPUදࣔͷߋ৽Λදࣔ ϨϯμϦϯάͷσʔλղੳπʔϧ ɾLayoutInspector
45. ɾLayoutͷώΤϥϧΩʔΛRuntimeͰղੳ͢ΔͨΊͷπʔ ϧɻxmlɺ·ͨ͸ಈతੜ੒ͨ͠ViewͳͲͷ֊૚ߏ଄͕Θ͔Β ͳ͍ࡍʹར༻͢Δɻ ɾTools -> LayoutInspector͔Β࣮ߦͰ͖Δ ɾproject_root/capturesʹRuntimeͷεφοϓγϣοτ͕อଘ͞ΕΔ LayoutInspector
46. όʔδϣϯ؅ཧ(6*࣮૷ߏ଄ϓϩύςΟ Captureͷ੾Γସ͑ Viewߏ଄ ※) staging؀ڥͷͨΊdebug tool view͕දࣔ͞Ε͍ͯΔ ViewϓϩύςΟ αϯϓϧ
47. ɾGPUϨϯμϦϯάͷϓϩϑΝΠϧ࡞੒ ɾGPUϨϯμϦϯάͷϓϩηεຖͷίετ ɾGPUΦʔόʔυϩʔΛσόοά ɾGPUϨϯμϦϯάͷOverdraw ɾGPUදࣔͷߋ৽Λදࣔ ɾGPUϨϯμϦϯάߋ৽৔ॴͷಛఆ ։ൃऀΦϓγϣϯ
48. ։ൃऀΦϓγϣϯ GPUϓϩϑΝΠϧ GPUΦʔόʔυϩʔ - ࢵɺԫ྘ͷΤϦΞ GPUදࣔͷߋ৽ - ੺͍ਖ਼ํܗ 16msϥΠϯ 1frame αϯϓϧ
49. 'J/$ΞϓϦʹࢼͯ͠ΈΔ
50. 'J/$ΞϓϦͷར༻ස౓͕ߴ͍ը໘Ͱଌఆ ɾ੺͍৭͸Overdrawճ਺͕4ճΛ௒͑Δ΋ͷɻ ɾఆظ࣮ߦΞχϝʔγϣϯ͕૸Δ౓ʹɺGPU Profilerͷ੺ ͍όʔ͕௓Ͷ্͕Δ ɾఆظ࣮ߦΞχϝʔγϣϯΛࢭΊͯ΋ɺͳ͔ͥ਺ඵຖʹը ໘ͷ΢Οϯυ΢͕఺໓͠ɺΞοϓσʔτ͕૸ͬͯ͠·͏ɻ ɾGPU Profilerͷ੨͍όʔ͕େ͖͍ɻ ϨϯμϦϯάύϑΥʔϚϯεଌఆ
51. ύϑΥʔϚϯεͷج४Λઃஔ͢Δ ج४Λઃఆ͢Δ ɾແବͳվળΛ͠ͳ͍ͨΊ ɾఆྔత͕೉͚͠Ε͹ɺج४Λ࡞Δ ɾߴ඼࣭ΞϓϦ ɾಉػೳΞϓϦ
52. *OTUBHSBNͱͷൺֱ ՄೳͳݶΓಉ৚݅ ɾ੺͍όʔ͸ಉ͡ఔ౓ ɾ੨͍όʔ͕શମతʹߴ͍ɻ ɾશମతʹOverdraw͕গͳ͍ɻ ɹɾView֊૚͕গͳ͍ ɹɾແବͳΞϧϑΝ͕ͳ͍ ɹɾద੾ͳΫϦοϐϯάॲཧ ߴ඼࣭ΞϓϦͱͷൺֱ
53. ɾOverdraw RecyclerViewͷitemViewͷ༨෼ͳView֊૚ ɾGPU Profiler ɾ੨͍όʔ͕େ͖͍ = onDraw()ͷDisplayListੜ੒ͷίετɻ onDraw()ͷස౓ɺoff-screenͷϨϯμϦϯάɺonDraw()ͷॲཧ͕ॏ͍ ɾGPUඳըͷߋ৽ ɾఆظ࣮ߦΞχϝʔγϣϯͷίετ ɹɾFiNCͪΌΜ(ΞΠίϯ) ۩ମతͳ໰୊఺
54. ɾෆཁͳbackgroundͷ࡟আ Overdraw΁ͷରԠ ɾਂ͍ViewΛઙ͘͢Δ
55. Viewίϯςφʹແବͳ֊૚͸ͳ͍͔ʁ ෆཁͳbackgroundͷ࡟আ TextView FrameLayout RecyclerView
56. ɾxml্ͰແବͳViewίϯςφΛ࡞Βͳ͍ ਂ͍ViewΛઙ͘͢Δ ɾಈతʹ௥Ճ͢Δ৔߹Ͱ΋ɺmergeΛݕ౼ ɾConstraintLayoutΛར༻͢Δ
57. վળ݁Ռ վળલ վળޙ
58. ɾPO%SBX಺ͰͷϝϞϦΞϩέʔτېࢭ GPUϨϯμϦϯά΁ͷରԠ ɾPO%SBX಺ͰͷMPPQॲཧͷվળ ɾPGGTDSFFOϨϯμϦϯάͷఀࢭ
59. PO%SBX͸ίετ͕ߴ͍ ɾෆมΦϒδΣΫτ͸ɺελοΫྖҬʹల։͢Δ Before onDraw಺ͰͷϝϞϦΞϩέʔτېࢭ ɾGC͕ߴ͍ස౓Ͱ૸ͬͯ͠·͏ After
60. MPPQͷ$BOWBTૢ࡞͸ίετ͕ߴ͍ ɾGPUϨϯμϦϯά͸GPU΁ͷΦϒδΣΫτΛੜ੒͢Δ onDraw಺Ͱͷloopॲཧͷվળ ɾCanvas#drawLineͰloopͰ͸ͳ͘ɺCanvas#drawLinesΛ࢖͏
61. PGGεΫϦʔϯ࣌ͷॲཧΛࢭΊΔ off-screenͷϨϯμϦϯάͷېࢭ ɾBVUP
    TMJEF͕ద༻ ɾλϒ ΧελϜ7JFX1BHFS Ҡಈ࣌ʹࢭΊΔ ɾWJTJCMF6TFS)JOU
62. ఆظ࣮ߦΞχϝʔγϣϯͷ࣮ߦ GPUඳըͷߋ৽ ˠΧελϜϏϡʔͷ)8"Λ༗ޮʹ
63. ɾ6*ͷجૅΛֶͼɺΞϯνύλʔϯΛ౿·ͳ͍ UIվળͷ·ͱΊ ɾ5PPMΛద੾ʹ࢖͍ɺύϑΥʔϚϯεΛվળ
64. 6*ͷվળ σʔλ௨৴ྔ όοςϦʔফඅ ύϑΥʔϚϯενϡʔχϯά࣮ફ
65. Ωϟογϡͷར༻ σʔλ௨৴ྔΛ࡟ݮ͢ΔͨΊʹ ωοτϫʔΫ Packet Packet Packet ը૾σʔλͷ࡟ݮ ม׵ γϦΞϥΠθʔγϣϯ
66. Ωϟογϡͷར༻
67. ϝϞϦ Ωϟογϡͱ͸ʁ σʔλͷϩʔυΛߴ଎Խ͢ΔͨΊͷ࢓૊Έ σΟεΫ
68. Ϣʔεέʔεʹ߹Θͤͯ࢖͏ σʔλอ࣋ظؒ ϝϞϦΩϟογϡ σΟεΫΩϟογϡ ࣮ߦεϨου ΞϓϦϓϩηε Πϯετʔϧத ͲͷεϨουͰ΋ྑ͍ ϫʔΧʔεϨου อଘྖҬ গͳ͍ ଟ͍ ϝϞϦ vs σΟεΫΩϟογϡ
69. ɾϝϞϦΩϟογϡ༻ͷAndroidఏڙΫϥε →࢖༻ՄೳϝϞϦ্ݶͷνΣοΫ →্ه͔ΒLruCacheͷར༻ՄೳϝϞϦྔΛׂΓ౰ͯ ࢀߟ) https://developer.android.com/topic/performance/graphics/cache-bitmap ɾ࢖༻ස౓͕௿͍σʔλΛ࡟আ͍ͯ͘͠ LruCacheΛ༻͍ͨϝϞϦΩϟογϡ
70. ɾσΟεΫ: ετϨʔδͷ2%ΛׂΓ౰ͯ (5MBʙ50MBͷൣғ಺) ࢀߟ) https://github.com/square/picasso/blob/master/picasso/src/main/java/com/squareup/picasso3/Utils.java#L163-L182 ɾsquareࣾͷը૾ϩʔυ&ΩϟογϡͷϥΠϒϥϦ ࢀߟ) https://github.com/JakeWharton/picasso2-okhttp3-downloader/blob/master/src/main/java/com/jakewharton/picasso/OkHttp3Downloader.java ɾΧελϜΩϟογϡ(Okhttp3) ɾϝϞϦ: ώʔϓྖҬͷ15%ΛׂΓ౰ͯ ࢀߟ) https://github.com/square/picasso/blob/master/picasso/src/main/java/com/squareup/picasso3/Utils.java#L184-L190 PicassoΛ༻͍ͨϝϞϦ/σΟεΫΩϟογϡ
71. Ωϟογϡ͸ೋछྨ͋ΓɺϝϞϦ͸شൃੑɺσΟε Ϋ͸ෆشൃੑ Ωϟογϡ͸σʔλ΁ͷΞΫηεΛߴ଎Խ͢Δ Ωϟογϡར༻ͷ·ͱΊ →σʔλϩʔυͷͨΊͷωοτϫʔΫॲཧճ਺͕ݮ গ͠ɺύϑΥʔϚϯε͕޲্͢Δɻ
72. Ωϟογϡͷར༻ σʔλ௨৴ྔΛ࡟ݮ͢ΔͨΊʹ ωοτϫʔΫ Packet Packet Packet ը૾σʔλͷ࡟ݮ ม׵ γϦΞϥΠθʔγϣϯ
73. γϦΞϥΠθʔγϣϯ
74. ྫ) ɾAPI௨৴ͰͷKotlin 㲗 JSON ɾΩϟογϡ࣌ͷϑΝΠϧॻ͖ࠐΈ ௚ྻԽͷ͜ͱɻಛఆͷ؀ڥʹґଘͨ͠ΦϒδΣΫτ ΛόΠτྻʹม׵͢Δ͜ͱ γϦΞϥΠθʔγϣϯͱ͸ʁ ม׵
75. γϦΞϥΠθʔγϣϯͷύϑΥʔϚϯε ϝϦοτ ςΩετ(JSON, XML) όΠφϦʔܗࣜ Մಡੑ͕ߴ͍ σϝϦοτ ແବͳσʔλ͕ଟ͍ σʔλྔ͕গͳ͍ Մಡੑ͕௿͍ ςΩετ vs όΠφϦʔ
76. +40/ͰͷςΩετܗࣜ ɾςΩετϕʔεͷܗࣜ͸৑௕Ͱσʔλྔ͕ଟ͘ͳΔ { “id”: 0, “name”: “bison”, “image”: “https://bisonworks/bisons/1/image” } ۭന Ϧλʔϯ ࢀর JSON
77. ɾprotoϑΝΠϧΛఆٛ →ίϯύΠϧ →ݴޠ͝ͱͷߏ଄ମͷੜ੒ ɾόΠφϦܗࣜͰγϦΞϥΠζ͞ΕΔɻ ɾෳ਺ݴޠؒͰͷҰ؏ੑΛอͯΔ ɾprotoϑΝΠϧ͸Մಡੑ΋ߴ͍ message Animal { required string name = 1; required int32 id = 2; optional string image =3; } Protocol Buffers
78. ɾςΩετܗࣜ(JSON, XML)͸Մಡੑ͸ߴ͍͕ɺσʔλྔ͸ଟ͍ ɾόΠφϦʔܗࣜ͸Մಡੑ͸௿͍͕ɺσʔλྔ͸গͳ͍ɻ ɾProtocol Buffers͸DSLͷΑ͏ͳ΋ͷͰɺՄಡੑ͕ߴ͘ɺ ͔ͭૹड৴࣌ͷγϦΞϥΠζ͞Εͨσʔλྔ΋গͳ͍ γϦΞϥΠθʔγϣϯͷ·ͱΊ →Protocol BufferͰՄಡੑߴ͘ɺσʔλྔ͕গͳ͍γϦ ΞϥΠζΛߦ͏
79. Ωϟογϡͷར༻ σʔλ௨৴ྔΛ࡟ݮ͢ΔͨΊʹ ωοτϫʔΫ Packet Packet Packet ը૾σʔλͷ࡟ݮ ม׵ γϦΞϥΠθʔγϣϯ
80. ը૾σʔλͷ࡟ݮ
81. ը૾ϑΥʔϚοτʹؔͯ͠ ը૾ͷϑΥʔϚοτʹ஫ҙ͢Δ ɾσʔλྔ͕ஶ͘͠มΘΔ ɾը૾ͷΫΦϦςΟ͕มΘΔ
82. ը૾ϑΥʔϚοτνʔτγʔτ ࢀߟ
    IUUQTEFWFMPQFSBOESPJEDPNUPQJDQFSGPSNBODFOFUXPSLYGFS
83. WebPͷύϑΥʔϚϯε Մٯѹॖͷ৔߹ɺPNGΑΓ26%খ͍͞ ෆՄٯѹॖͷ৔߹ɺJPEGΑΓ25-34%খ͍͞ ࢀߟ
    IUUQTEFWFMPQFSTHPPHMFDPNTQFFEXFCQ
84. WebPҎ֎ͷ৔߹ PNG͔JPEG͔
85. PNGͱJPEG PNG JPEG ɾಁաʹରԠ ɾՄٯѹॖ ɾෆՄٯѹॖ
86. Ϣʔεέʔε PNG JPEG ɾγϯϓϧͳը૾ ɾෳࡶͳը૾ Α͘ݴΘΕΔը૾ͷ࢖͍෼͚
87. γϯϓϧͳը૾ͷఆٛͱ͸
88. γϯϓϧͳը૾ PNG JPEG ɾෳࡶͳۂઢ͕ଘࡏ͠ͳ͍ܗ ɾ৭ͷόϦΤʔγϣϯ͕গͳ͍ ɾෳ਺ͷ৭ͷόϦΤʔγϣϯ ɾෳࡶͳۂઢ
89. ͳ͔ͥʁ
90. PNGѹॖͷΞϧΰϦζϜ(Indexed Format) RGBΛࢀর͢Δܗʹมߋ͢Δ ɾը૾͸ϐΫηϧ͝ͱʹRGB৘ใΛ࣋ͭ ɾ8bit(256֊ௐ) * 3 = 24bit = 2^24 ≒ 1600ສ৭ ɾϐΫηϧ͕࣋ͭ৘ใ͸IndexͷΈ ɾΧϥʔύϨοτΛ࣋ͭ(্ݶΛઃ͚Δ)
91. ୯ҐϐΫηϧͷ৘ใྔ͕ܹݮ͢Δ ύϨοτ਺͸2,4,16,256͕ࢦఆͰ͖Δ ɾ1byteͰදݱͰ͖Δ 24bit = 3bytes 1byte
92. JPEGͷΞϧΰϦζϜ 8ϐΫηϧ͝ͱͷϒϩοΫʹ෼͚ͯॲཧ ϒϩοΫ಺Ͱ৘ใΛϑΟϧλϦϯά͢Δ
93. ௚ઢతͳڥքʹऑ͍ ڥք͕ΑΓ௚ઢͩͱը࣭͕ѱ͘ͳΔ 8pixel
94. ໨ࢹνΣοΫ ਓؒͷ໨͸͍͍Ճݮ ໨ࢹνΣοΫͰσʔλྔͷ࡟ݮΛʂ
95. ը૾σʔλ࡟ݮͷ·ͱΊ WebPରԠ͍ͯ͠Ε͹WebPͷҰ୒ JPEGɺPNGͷσʔλྔΛཧղ͢Δɻ ͦͷ্Ͱ࣮ࡍͷ໨Ͱ֬ೝͯ͠ѹॖ͢Δɻ
96. 6*ͷվળ σʔλ௨৴ྔ όοςϦʔফඅ ύϑΥʔϚϯενϡʔχϯά࣮ફ
97. ɾϓϩηοα(ϋʔυ)Ͱిྲྀ͕ྲྀΕΔ ɾOS(ιϑτ)͕CPUͷϞʔυมߋΛߦ͏ → CPUϞʔυΛ௿͘อͭ όοςϦʔফඅΛ࡟ݮ͢ΔͨΊʹ
98. $16͸ిྗΛޮ཰తʹ࢖͓͏ͱ͢Δ CPUʹ͸Ϟʔυ͕͋Δ
99. ࣍ͷॲཧʹඋ͑Δ,FFQ
    "XBLFͷίετ ϞόΠϧ௨৴࣌ͷফඅిྗ
100. ϞόΠϧ௨৴Λࡉ੾Εʹͨ͘͠ͳ͍
101. όονॲཧͱ͸ʁ ෼ࢄͨ͠λεΫΛಉ࣌ʹ࣮ߦ͢Δ͜ͱɻΦʔόʔϔουΛݮগͤ͞Δɻ Task Before After Executed Task Executed Task Executed Task Task Task Executed 1 1 1 1 ϞόΠϧ௨৴࣌ͷফඅిྗ
102. αʔόʔͱͷσʔλͷಉظੑ͕ݫີͰͳ͍΋ͷ ࠷ѱɺσʔλ͕ࣦΘΕͯ΋໰୊͕ͳ͍΋ͷ ෼ੳϩάσʔλ ఆظతͳσʔλͷಉظ ϞόΠϧʹ͓͚Δόονॲཧ
103. ɾJobSchedulerͱAlertManagerΛOSόʔδϣϯͰ࢖͍෼͚ ɾෳ਺λεΫͷνΣΠϯ ɾδϣϒʹ੍ݶΛ͚ͭΒΕΔ ɾόοςϦʔফඅ/ωοτϫʔΫঢ়ଶ/ॆిঢ়ଶ/CPUͷঢ়ଶ/ετϨʔδͷۭ͖ ɾ஗ԆͰ͖Δ(Deferrable)ఆظత/ϫϯλΠϜͳδϣϒʹ࢖͏ WorkManager ɾόοΫΦϑ(ࢦ਺ؔ਺తස౓)αϙʔτ
104. ϘτϧωοΫΛ୳Γ͍ͨ
105. #BUUFSZ
     )JTUPSJBO ୺຤ͷόοςϦʔফඅྔΛՄࢹԽग़དྷΔπʔϧ 1. OverViewͷάϥϑ ɾ߲໨ΛϐοΫͨ͠ΧελϜάϥϑ΋Ͱ͖Δ 2. App Selection ɾΞϓϦ/߲໨ͰϑΟϧλՄೳ 3. Tables ɾΞϓϦؒൺֱ/ώετϦʔ(ྦྷੵσʔλ)/ΞϓϦελοπ 4. ݁Ռ ɾϑΟϧλ݁ՌΛදࣔ͢Δ σʔλղੳπʔϧ
106. ɾ୺຤ͷి஑ফඅྔΛՄࢹԽग़དྷΔπʔϧ ɾDocker্Ͱಈ͘(Α͏ʹͳͬͯΔʂ) 1. OverViewͷάϥϑ 2. App Selection 3. Tables 4. ݁Ռ Battery Historianͷશମతͳߏ੒
107. ɾެࣜ: https://github.com/google/battery-historian EPDLFS
     
     SVO
     Q
     QPSU
     HDSJPBOESPJECBUUFSZIJTUPSJBOTUBCMF
     QPSU
      ɾ<port>͸ԿͰ΋Α͍ɻ9999ͱ͔ʹ͓ͯ͘͠ IUUQMPDBMIPTUQPSU ɾAndroid୺຤಺ʹbugreportsͷdir͕͋Δ adb bugreport bugreport.zip ※) ެࣜͷͰΤϥʔ͕ग़Δਓ͸ී௨ʹabdͰϑΝΠϧసૹ͍ͯͩ͘͠͞ɻ ؀ڥߏங
108. Battery Level͸1ࠁΈͳͷͰɺ୹͍෦෼͕ফඅిྗ͕ߴ͍෦෼ όοςϦʔͷղੳํ๏
109. CPUͷϞʔυ ϞόΠϧ௨৴͸ίετ͕ߴ͍ όοςϦʔͷղੳํ๏
110. ܧଓతଌఆ͕೉͍͠
111. ܦݧ্ɺٙͬͯΈΔͱྑͦ͞͏ͳ͜ͱ όοΫάϥ΢ϯυͰఆظతͳॲཧΛ࣮ߦ͍ͯ͠Δ ը໘্Ͱଟ͘ͷωοτϫʔΫॲཧΛߦ͍ͬͯΔλεΫ ఆੑతʹ΋Ξϓϩʔν͢Δ ɾස౓ɺॏ͍ॲཧ ɾෆద੾ͳϥΠϑαΠΫϧ(onResumeͳͲ)Ͱͷίʔϧ
112. CPUͷϞʔυ(awake, sleep)ΛSleep΁ ϞόΠϧ௨৴͸஗ԆΛݕ౼͢Δ ఆྔͱఆੑతͳ྆໘͔ΒΞϓϩʔν͢Δ όοςϦʔফඅͷ࠷దԽ·ͱΊ
113. RailsςοΩʔͳ࿩
     ϚΠΫϩαʔϏεͷཁૉٕज़ͷ࿩
     Ϛωδϝϯτͷ࿩ શମతͳ·ͱΊ
114. શମతͳ·ͱΊ ࠶ݱੑ͕௿͍ύϑΥʔϚϯε໰୊ʹରॲ͢Δ ύϑΥʔϚϯεͷલఏ஌ࣝΛ͚ͭɺఆੑͱఆྔͱͷ ྆ྠ͔ΒΞϓϩʔν͍ͯ͘͠