More Swift App Startup Time

#otemachi_swift #1
https://nikkei.connpass.com/event/58452/

Transcript

1. More Swift App Startup Time @giginet
2. @giginet • iOS Engineer @ Cookpad • ։ൃج൫΍ͬͯ·͢ • झຯɿήʔϜ։ൃ • Contributor of fastlane
4. Agenda • ࠔ͍ͬͯΔ͜ͱ • Dynamic Linkerͱdyld 3 • LabͰฉ͍ͨ͜ͱ • ىಈ࣌ؒͷޮՌతͳܭଌํ๏ • LabͰੜ͖࢒Δʹ͸
5. ࠔ͍ͬͯΔ͜ͱ • Dynamic Framework͕஗͍໰୊
6. ࠔ͍ͬͯΔ͜ͱ • SwiftͷϥΠϒϥϦ͸Dynamic Frameworkͱͯ͠Ϧϯ Ϋ͞ΕΔ • Carthage • CocoaPods(use_frameworks!) • ૿΍͢ͱىಈ͕஗͘ͳΔ • ؀ڥʹΑͬͯ͸Ϋϥογϡ͢Δ
7. ཧ૝
8. ݱ࣮
9. Φεεϝηογϣϯ • App Startup Time: Past, Present, and Future • https://developer.apple.com/videos/play/ wwdc2017/413/ • Optimizing App Startup Time • https://developer.apple.com/videos/play/ wwdc2016/406/
10. dyld 3 • ৽͍͠Dynamic Linker࡞ͬͯΔ • ࣮༻ஈ֊ʹͳͬͨΒϦϯΫ͕ΊͬͪΌૣ͘ͳ ΔΒ͍͠
11. Optimizing Startup Time • ىಈ࣌ؒߴ଎Խͷ஌ݟͷηογϣϯ • ܭଌख๏ͱվળͷํ๏
12. Optimizing Startup Time Lab • ΊͬͪΌχονͳLab͕͔͋ͬͨΒฉ͖ʹ͍ͬ ͨ
13. LabͰฉ͍ͨ͜ͱ
14. Q. Dynamic FrameworkΛ૿ ΍͠·͘ΔͱΊͬͪΌ஗͘ͳͬ ͯࠔͬͯΔΜ͚ͩͲ૿΍͢΂ ͖Ͱ͸ͳ͍ʁ
15. A. ͤ΍ͳ
16. Q. Swiftͷݴޠػೳʹ namespaceͳ͍͠ɺ frameworkΘ͚ͳ͍ͱݫ͍͠ ͱࢥ͏Μ͚ͩͲ
17. A. ΫϥεʹprefixΛ͚ͭ· ͠ΐ͏
18. Q. dyld 3͸iOS 11ͰೖΔͷ ͔ʁ
19. A. ͳʹ΋ݴ͑Δ͜ͱ͸ͳ͍
20. • ۜͷ஄ؙ͸ͳ͍
21. ىಈ࣌ؒͷܭଌํ๏
22. 1. InstrumentsΛ࢖͏ • ʮApp Startup Time: Past, Present, and FutureʯͰ঺հ͞ΕͯΔ • Time Profiler • Static Initializer Call(iOS 11)
24. 2. Instruments via CLI • ಉ͜͡ͱ͕ίϚϯυϥΠϯ͔Β΋Ͱ͖Δ • instrumentsίϚϯυ • ͨͩ͠ɺग़ྗͨ͠σʔλ͸GUIͰͳ͍ͱӾཡͰ ͖ͳ͍ʢύʔε͢Δํ๏͸ͳ͍ʣ • ৄ͘͠͸man instruments
25. $ instruments -t 'Time Profiler' -w ‘36AF1B72-C261-45BD- AE4A-6593D22F0A' ‘com.yourcompany.InitializeTimeProfiler' Instruments Trace Complete (Duration : 11.811208s; Output : /Users/ giginet/Desktop/InitializeTimeProfiler/instrumentscli1.trace)
26. 3. task_info + UI Test • task_infoͰCPU࣌ؒऔͬͯܭଌ͢Δͱྑ͍ͷ Ͱ͸ʁͱݴΘΕͨ • didFinishLaunchingWithOptionsͰͷ࣌ؒΛ औΔ
27. var info = mach_task_basic_info() var count = mach_msg_type_number_t(MemoryLayout.size(ofValue: info) / MemoryLayout<integer_t>.size) _ = withUnsafeMutablePointer(to: &info) { infoPointer in return infoPointer.withMemoryRebound(to: integer_t.self, capacity: Int(count)) { (machPoin return task_info( mach_task_self_, task_flavor_t(TASK_BASIC_INFO), task_info_t(machPointer), &count ) } } print(info.system_time) print(info.user_time)
28. 4. DYLD_PRINT_STATISTICS • ʮOptimizing App Startup TimeʯͰ঺հ͞Ε ͯΔ • ͦΕͧΕͷ஋ͷҙຯ͸ηογϣϯΛݟΔ͜ͱ
30. Total pre-main time: 307.08 milliseconds (100.0%) dylib loading time: 213.98 milliseconds (69.6%) rebase/binding time: 39.27 milliseconds (12.7%) ObjC setup time: 25.78 milliseconds (8.3%) initializer time: 27.96 milliseconds (9.1%) slowest intializers : libSystem.dylib : 3.17 milliseconds (1.0%) libswiftCoreImage.dylib : 17.56 milliseconds (5.7%)
31. ·ͱΊ • ஗͍ͷ͸ݱঢ়Ͳ͏͠Α͏΋ͳ͍ • ΞϓϦͷىಈ࣌ؒܭଌख๏͸ฉ͚ͨ • ࣗಈԽ͍ͨ͠ • Micro Framework Architecture͸ݬ૝ • dyld 3Λ࠲ͯ͠଴͔ͭ͠ແ͍
32. See also • giginet/xcprofiler • https://github.com/giginet/xcprofiler
33. ΦϚέ LabͰੜ͖࢒Δʹ͸
34. ΦϚέɿLabͰੜ͖࢒Δʹ͸ • ୆ຊΛ࡞͍ͬͯ͘ • ʮΏͬ͘Γ஻ͬͯ͘ΕʯͱఝΛࢗ͢ • ಉ͜͡ͱΛ2ਓҎ্ʹฉ͘
35. ୆ຊΛ࡞͍ͬͯ͘ • ฉ͘͜ͱΛϦετԽɻจষ΋࡞จ͓ͯ͘͠ • ϝϞΛݟͤͳ͕Β࣭໰͢Δ
36. ʮΏͬ͘Γ஻ͬͯ͘Εʯͱ ఝΛࢗ͢ • ѫࡰͨ͠Β଎߈ʮΏͬ͘Γͯ͘͠ΕཔΉʯ ͱ͔ݴ͓ͬͯ͘ͱେ఍Ώͬ͘Γ஻ͬͯ͘ΕΔ • ࠷ѱɺଧͪࠐΜͰ΋Β͏
37. ಉ͜͡ͱΛ2ਓҎ্ʹฉ͘ • ஌ࣝྔʹ͕ࠩ͋Δ • ଞͷਓʹdelegate͞ΕΔ͜ͱ͕͋Δ • ͱΓ͋͑ͣಉ࣭͡໰Λผʑʹ͓ͯ͘͠ • ҧ͏ճ౴͕ಘΒΕΔ͜ͱ΋͋Δ
38. ͝ਗ਼ௌ ͋Γ͕ͱ͏͍͟͝·ͨ͠