More Swift App Startup Time

by giginet

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More Swift App Startup Time @giginet

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@giginet • iOS Engineer @ Cookpad • ։ൃج൫΍ͬͯ·͢ • झຯɿήʔϜ։ൃ • Contributor of fastlane

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Agenda • ࠔ͍ͬͯΔ͜ͱ • Dynamic Linkerͱdyld 3 • LabͰฉ͍ͨ͜ͱ • ىಈ࣌ؒͷޮՌతͳܭଌํ๏ • LabͰੜ͖࢒Δʹ͸

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ࠔ͍ͬͯΔ͜ͱ • Dynamic Framework͕஗͍໰୊

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ࠔ͍ͬͯΔ͜ͱ • SwiftͷϥΠϒϥϦ͸Dynamic Frameworkͱͯ͠Ϧϯ Ϋ͞ΕΔ • Carthage • CocoaPods(use_frameworks!) • ૿΍͢ͱىಈ͕஗͘ͳΔ • ؀ڥʹΑͬͯ͸Ϋϥογϡ͢Δ

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ཧ૝

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ݱ࣮

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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/

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dyld 3 • ৽͍͠Dynamic Linker࡞ͬͯΔ • ࣮༻ஈ֊ʹͳͬͨΒϦϯΫ͕ΊͬͪΌૣ͘ͳ ΔΒ͍͠

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Optimizing Startup Time • ىಈ࣌ؒߴ଎Խͷ஌ݟͷηογϣϯ • ܭଌख๏ͱվળͷํ๏

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Optimizing Startup Time Lab • ΊͬͪΌχονͳLab͕͔͋ͬͨΒฉ͖ʹ͍ͬ ͨ

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LabͰฉ͍ͨ͜ͱ

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Q. Dynamic FrameworkΛ૿ ΍͠·͘ΔͱΊͬͪΌ஗͘ͳͬ ͯࠔͬͯΔΜ͚ͩͲ૿΍͢΂ ͖Ͱ͸ͳ͍ʁ

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A. ͤ΍ͳ

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Q. Swiftͷݴޠػೳʹ namespaceͳ͍͠ɺ frameworkΘ͚ͳ͍ͱݫ͍͠ ͱࢥ͏Μ͚ͩͲ

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A. ΫϥεʹpreﬁxΛ͚ͭ· ͠ΐ͏

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Q. dyld 3͸iOS 11ͰೖΔͷ ͔ʁ

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A. ͳʹ΋ݴ͑Δ͜ͱ͸ͳ͍

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• ۜͷ஄ؙ͸ͳ͍

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ىಈ࣌ؒͷܭଌํ๏

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1. InstrumentsΛ࢖͏ • ʮApp Startup Time: Past, Present, and FutureʯͰ঺հ͞ΕͯΔ • Time Proﬁler • Static Initializer Call(iOS 11)

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2. Instruments via CLI • ಉ͜͡ͱ͕ίϚϯυϥΠϯ͔Β΋Ͱ͖Δ • instrumentsίϚϯυ • ͨͩ͠ɺग़ྗͨ͠σʔλ͸GUIͰͳ͍ͱӾཡͰ ͖ͳ͍ʢύʔε͢Δํ๏͸ͳ͍ʣ • ৄ͘͠͸man instruments

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$ 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)

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3. task_info + UI Test • task_infoͰCPU࣌ؒऔͬͯܭଌ͢Δͱྑ͍ͷ Ͱ͸ʁͱݴΘΕͨ • didFinishLaunchingWithOptionsͰͷ࣌ؒΛ औΔ

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var info = mach_task_basic_info() var count = mach_msg_type_number_t(MemoryLayout.size(ofValue: info) / MemoryLayout.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)

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4. DYLD_PRINT_STATISTICS • ʮOptimizing App Startup TimeʯͰ঺հ͞Ε ͯΔ • ͦΕͧΕͷ஋ͷҙຯ͸ηογϣϯΛݟΔ͜ͱ

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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%)

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·ͱΊ • ஗͍ͷ͸ݱঢ়Ͳ͏͠Α͏΋ͳ͍ • ΞϓϦͷىಈ࣌ؒܭଌख๏͸ฉ͚ͨ • ࣗಈԽ͍ͨ͠ • Micro Framework Architecture͸ݬ૝ • dyld 3Λ࠲ͯ͠଴͔ͭ͠ແ͍

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See also • giginet/xcproﬁler • https://github.com/giginet/xcproﬁler

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ΦϚέ LabͰੜ͖࢒Δʹ͸

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ΦϚέɿLabͰੜ͖࢒Δʹ͸ • ୆ຊΛ࡞͍ͬͯ͘ • ʮΏͬ͘Γ஻ͬͯ͘ΕʯͱఝΛࢗ͢ • ಉ͜͡ͱΛ2ਓҎ্ʹฉ͘

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୆ຊΛ࡞͍ͬͯ͘ • ฉ͘͜ͱΛϦετԽɻจষ΋࡞จ͓ͯ͘͠ • ϝϞΛݟͤͳ͕Β࣭໰͢Δ

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ʮΏͬ͘Γ஻ͬͯ͘Εʯͱ ఝΛࢗ͢ • ѫࡰͨ͠Β଎߈ʮΏͬ͘Γͯ͘͠ΕཔΉʯ ͱ͔ݴ͓ͬͯ͘ͱେ఍Ώͬ͘Γ஻ͬͯ͘ΕΔ • ࠷ѱɺଧͪࠐΜͰ΋Β͏

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ಉ͜͡ͱΛ2ਓҎ্ʹฉ͘ • ஌ࣝྔʹ͕ࠩ͋Δ • ଞͷਓʹdelegate͞ΕΔ͜ͱ͕͋Δ • ͱΓ͋͑ͣಉ࣭͡໰Λผʑʹ͓ͯ͘͠ • ҧ͏ճ౴͕ಘΒΕΔ͜ͱ΋͋Δ

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͝ਗ਼ௌ ͋Γ͕ͱ͏͍͟͝·ͨ͠