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App startup time with Dynamic/Static frameworks
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Shota Kashihara
March 19, 2019
Technology
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App startup time with Dynamic/Static frameworks
Shota Kashihara
March 19, 2019
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Transcript
©2019 Wantedly, Inc. App startup time with Dynamic/Static frameworks try!
Swift Pre Talk 2019 Mar 19, 2019 - @ShotaKashihara
©2019 Wantedly, Inc. Shota Kashihara ɾWantedly People ɾiOS ɾSwift/Double base
ɾTwitter: @oakland76 ɾGitHub: @ShotaKashihara
©2019 Wantedly, Inc. ɾXcode ͱ Frameworks ͷྺ࢙ ɾΞϓϦͷىಈͱ Frameworks ͷؔ
ɾFrameworks ͷߏΛߟ͑Δ ࠓ͢͜ͱ
©2019 Wantedly, Inc. Xcode ͱ Frameworks ͷྺ࢙
©2019 Wantedly, Inc. Xcode ͱ Frameworks ͷྺ࢙ Dynamic/Static Framework Λ
͓͞Β͍
©2019 Wantedly, Inc. Xcode ͱ Frameworks ͷྺ࢙ Xcode 5 #2013
ɹɾOnly Static Library (Obj-C) Dynamic/Static Framework Λ ͓͞Β͍
©2019 Wantedly, Inc. Xcode ͱ Frameworks ͷྺ࢙ Xcode 5 #2013
ɹɾOnly Static Library (Obj-C) Xcode 6 #2014 ɹɾSupport embedded frameworks (Dynamic Library) Dynamic/Static Framework Λ ͓͞Β͍
©2019 Wantedly, Inc. Xcode ͱ Frameworks ͷྺ࢙ Xcode 5 #2013
ɹɾOnly Static Library (Obj-C) Xcode 6 #2014 ɹɾSupport embedded frameworks (Dynamic Library) Xcode 9 #2017 ɹɾSupport static library with Swift ɹɹɾCocoa Pods (v1.5.0), Carthage (v0.30.1) ʹͯ ରԠࡁ Dynamic/Static Framework Λ ͓͞Β͍
©2019 Wantedly, Inc. Dynamic/Static Framework
©2019 Wantedly, Inc. Framework ֦ுࢠ .framework ɾϥΠϒϥϦ ɾ(όϯυϧ) ɹɾNib ɹɾը૾
ɹɾϔομʔϑΝΠϧ ͳͲΛ·ͱΊͨϑΥϧμ Dynamic/Static Framework
©2019 Wantedly, Inc. Dynamic Framework .framework ɾಈతϥΠϒϥϦ (.dylib, or ֦ுࢠͳ͠)
ɹΛؚΜͩ Framework Dynamic/Static Framework
©2019 Wantedly, Inc. Dynamic Framework .framework ɾಈతϥΠϒϥϦ (.dylib, or ֦ுࢠͳ͠)
ɹΛؚΜͩ Framework ɾArchive ɹɾ<YourApp>/Frameworks/ Լʹ ɹɹ.framework ͷ··ίϐʔ Dynamic/Static Framework
©2019 Wantedly, Inc. Static Framework .framework ɾ੩తϥΠϒϥϦ (.a, or ֦ுࢠͳ͠)
ɹΛؚΜͩ Framework Dynamic/Static Framework
©2019 Wantedly, Inc. Static Framework .framework ɹ ɾArchive ɹɾ੩తϥΠϒϥϦίϯύΠϧ࣌ʹ੩తϦϯΧʹΑͬͯɺ ɹɹ࣮ߦՄೳϑΝΠϧʹؚ·ΕΔ(୯ҰͷϑΝΠϧʹͳΔ)
ɹɾϦιʔεϑΝΠϧΞϓϦέʔγϣϯԼʹίϐʔͯ͠ɺ ɹɹ࣮ߦՄೳϑΝΠϧ͔Βݟ͑Δঢ়ଶʹ͢Δඞཁ͋Γ Dynamic/Static Framework ← Static Library ίϯύΠϧͰ ࣮ߦՄೳϑΝΠϧͷҰ෦ʹͳΔ ɾ੩తϥΠϒϥϦ (.a, or ֦ுࢠͳ͠) ɹΛؚΜͩ Framework
©2019 Wantedly, Inc. Dynamic Library ͷ 2ͭͷಛ ɾDynamic Linking ɾDynamic
Loading Dynamic/Static Framework
©2019 Wantedly, Inc. Dynamic Linking ɾΞϓϦ࣮ߦ࣌ʹϦϯΫ͕ߦΘΕΔ͜ͱ ɾ࣮ߦՄೳϑΝΠϧΛখ͘͞อͭ͜ͱ͕Ͱ͖Δ Dynamic/Static Framework
©2019 Wantedly, Inc. Dynamic Loading ɾ`dlopen()` ɾΞϓϦىಈ࣌Ͱͳ͘ɺඞཁͳͱ͖ʹϩʔυΛ࢝ΊΔ͜ͱ͕Ͱ͖Δ ɾiOS Ͱ͍ͬͯΔ໘Λ͋·Γݟͨ͜ͱ͕ͳ͍ Dynamic/Static
Framework
©2019 Wantedly, Inc. ΞϓϦͷىಈʹͲ͏͍͏ϑϩʔ͕͋Δ͔
©2019 Wantedly, Inc. exec() to main()
©2019 Wantedly, Inc. exec() to main() ΞϓϦ্ཱ͕͕ͪΔ·ͰʹཪଆͰى͖͍ͯΔ͜ͱ ※ WWDC 2016
(Optimizing App Startup Time) ʹͯݴٴ͞ΕͨςʔϚ exec() to main()
©2019 Wantedly, Inc. exec() 1. Kernel maps your application into
new address space 2. Kernel loads helper program 3. Dyld runs in-process exec() to main()
©2019 Wantedly, Inc. exec() 1. Kernel maps your application into
new address space 2. Kernel loads helper program 3. Dyld runs in-process exec() to main()
©2019 Wantedly, Inc. exec() 1. Kernel maps your application into
new address space 2. Kernel loads helper program 3. Dyld runs in-process exec() to main()
©2019 Wantedly, Inc. exec() 1. Kernel maps your application into
new address space 2. Kernel loads helper program 3. Dyld runs in-process exec() to main()
©2019 Wantedly, Inc. exec() 1. Kernel maps your application into
new address space 2. Kernel loads helper program 3. Dyld runs in-process Dyld: ࣮ߦ࣌ʹ dynamic library ΛಡΈࠐΉϓϩηεͷ͜ͱ exec() to main()
©2019 Wantedly, Inc. Dyld Steps 1. Map all dependent dylibs,
recurse 2. Rebase all images 3. Bind all images 4. ObjC prepare images 5. Run initializers exec() to main()
©2019 Wantedly, Inc. Dyld Steps 1. Map all dependent dylibs,
recurse 2. Rebase all images 3. Bind all images 4. ObjC prepare images 5. Run initializers exec() to main()
©2019 Wantedly, Inc. Dyld Steps 1. Map all dependent dylibs,
recurse 2. Rebase all images 3. Bind all images 4. ObjC prepare images 5. Run initializers exec() to main()
©2019 Wantedly, Inc. Dyld Steps 1. Map all dependent dylibs,
recurse 2. Rebase all images 3. Bind all images 4. ObjC prepare images 5. Run initializers exec() to main() ͜ΕΒ͕ Dynamic Framework ͷ͚ͩ࠶ؼ͢Δ
©2019 Wantedly, Inc. Dyld Steps ͜͜ʹͲΕ͘Β͍ͷ͕͔͔͍࣌ؒͬͯΔ͔ΛݟΔ exec() to main()
©2019 Wantedly, Inc. DYLD_PRINT_STATISTICS exec() to main()
©2019 Wantedly, Inc. DYLD_PRINT_STATISTICS exec() to main() ΞϓϦΛ্ཱͪ͛Δͱ main() ·Ͱʹ
Dyld ʹ͔͔͕ͬͨ࣌ؒදࣔ
©2019 Wantedly, Inc. exec() to main() ɾΞϓϦͷىಈ࣌ʹ Dyld ͕࠶ؼతʹ Framework
ΛϝϞϦʹஔ͢Δ ɾDynamic Framework ͷ͚ͩΦʔόʔϔου͕૿͑Δ ɹ exec() to main()
©2019 Wantedly, Inc. exec() to main() ɾΞϓϦͷىಈ࣌ʹ Dyld ͕࠶ؼతʹ Framework
ΛϝϞϦʹஔ͢Δ ɾDynamic Framework ͷ͚ͩΦʔόʔϔου͕૿͑Δ ɹ ɹˠ ෳͷ Dynamic Frameworks Λ Static Library ͱͯ͠Ϗϧυͯ͠ɺ ɹɹ ͦΕΒΛ·ͱΊͨ Dynamic Frameworks Λ࡞Δ exec() to main()
©2019 Wantedly, Inc. ΞϓϦ ͷߏ Domain.framework Main.app Watch.app C.framework B.framework
(3rd party) A.framework
©2019 Wantedly, Inc. ΞϓϦ ͷߏ Domain.framework Main.app Watch.app Umbrella frameworks
C.framework B.framework (3rd party) A.framework
©2019 Wantedly, Inc. ΞϓϦ ͷߏ Domain.framework Main.app Watch.app Umbrella frameworks
C.framework B.framework (3rd party) A.framework Static linking
©2019 Wantedly, Inc. ·ͱΊ
©2019 Wantedly, Inc. Summary ɾDynamic frameworks ͕૿͑Δͱ Dyld ͷίετ͕͔͔Δ ɾΞϓϦͷىಈ͕ؾʹͳͬͨΒ
DYLD_PRINT_STATISTICS ΦϓγϣϯͰ ɹDynamic Library ͷϩʔυʹ͔͔͍ͬͯΔ࣌ؒΛݟͯΈΑ͏ ɾDynamic frameworks Λ Static Frameworks ʹஔ͖͑ͯ ɹDyld ͷίετΛݮΒ͢͜ͱબࢶͷҰͭ App startup time with Dynamic/Static frameworks
©2019 Wantedly, Inc. Have a nice try! Swift day