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わかった気になる、Coroutine1.7.0のチャンネルのパフォーマンス向上
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RyuNen344
May 13, 2023
Technology
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400
わかった気になる、Coroutine1.7.0のチャンネルのパフォーマンス向上
RyuNen344
May 13, 2023
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Transcript
Θ͔ͬͨؾʹͳΔɺCoroutine1.7.0ͷ νϟϯωϧͷύϑΥʔϚϯε্ 2023.05.13 KotlinConf 2023 Global in Kyoto Bunjiro Miyoshi
About Me • teamLab Inc.ॴଐ • (ࣗশ)ϚϧνϓϥοτϑΥʔϜܳਓ • ࠷ۙGoogle/TinkͷKMMϥούʔϥΠϒϥϦ࡞ͬͨ •
https://github.com/RyuNen344/tink-kmm
kotlinx.coroutine 1.7 ϦϦʔε͞Ε·ͨ͠Ͷ
Release Note
Release Note runTestͷdefault timeout͕60s͔Β10sʹมߋ͞ΕͨΓ
Release Note Kotlin NativeʹDispatchers.IO͕ొ
Release Note Kotlin NativeͷOld Memory Model͕আ͞Εͨ
Release Note Channelͷ࠶࣮
͢͜ͱɾ͞ͳ͍͜ͱ • ͢͜ͱ • چ࣮ɾ৽࣮ͷҧ͍ • ;ΜΘΓͱͨ͠Lock freeपΓͷ • ͞ͳ͍͜ͱ
• Lock freeपΓͷఆٛతʹਖ਼͍͠ղઆ • kumagi͞Μͷࢿྉ͕ͱͯษڧʹͳΓ·͢ • https://www.docswell.com/s/kumagi/ZP99EQ-lock-free • Ktorͷ3rd PartyϥΠϒϥϦͷӨڹ
ͳͥ࠶࣮ #1 • σʔλߏConcurrent Double Linked List • ͦͦޡͬͨཧΛݩʹ࣮ͯ͠ •
อकੑͷ • ઢܗԽՄೳੑͷ • ૢ࡞͕ஞ࣮࣍ߦ͞Ε͍ͯΔ͜ͱͷอূ
ͳͥ࠶࣮(Double Linked List) #1 ઌ಄ͱ࠷ޙͷϙΠϯλΛอ࣋ w w w w
ͳͥ࠶࣮(Double Linked List) #1 ཁૉྡ͢ΔͷϙΠϯλΛอ࣋
ͳͥ࠶࣮(Double Linked List) #1
ͳͥ࠶࣮(Double Linked List) #1 ৽͍͠ཁૉͷੜ DoubleLinkedListࣗମͷઌ಄ͱ چઌ಄ͷཁૉͷྡ͢ΔཁૉΛߋ৽
ͳͥ࠶࣮ #2 • ࣮͕ෳࡶʹͳ͍ͬͯͯbyte code size, dex sizeʹѱӨڹ • DCAS,
N-word CASͰ࣮ • ֦ுੑɺਖ਼֬ੑɺύϑΥʔϚϯεʹ͕͋Δ • CASɿCompare And Swap જࡏతͳσʔλڝ߹ͷ͕ൃੜͨ͠߹ͷਪଌͱमਖ਼Λࠔʹ͍ͯͨ͠
ͳͥ࠶࣮(Compare And Swap) #2
ͳͥ࠶࣮(Compare And Swap) #2 Pointerͷٙࣅίʔυ
ͳͥ࠶࣮(Compare And Swap) #2 PointerͷͱPointerʹೖͬͯΔ͖ΛνΣοΫ w w
ͳͥ࠶࣮(Compare And Swap) #2 ظͲ͓Γͷ͕Pointerʹ֨ೲ͞Ε͍ͯͨΒߋ৽
ͳͥ࠶࣮(D-Compare And Swap) #2
ͳͥ࠶࣮(D-Compare And Swap) #2 ظͲ͓Γͷ͕Pointerʹ֨ೲ͞ΕΔ·ͰԿCAS
ͲͷΑ͏ʹ࠶࣮ • σʔλߏྻͰ࣮ • ΦϒδΣΫτૢ࡞Fetch And Addʹมߋ
ͲͷΑ͏ʹ࠶࣮(Fetch And Add) Pointerʹೖ͍ͬͯͨݹ͍ΛҰ࣌อଘͯ͠ॲཧΛ࣮ߦ
ͲͷΑ͏ʹ࠶࣮(Fetch And Add) Ұ࣌อଘͨ͠ݹ͍Λݺͼग़͠ݩʹฦ٫
࠶࣮ͯ͠Ͳ͏ͳΔ • ҰൠతͳڥͰ10 ʙ 25%ߴԽ
·ͱΊ • 1.7.0ͰChannelࣗମͷ࠶࣮͕ͳ͞ΕͯύϑΥʔϚϯε্͕ͨ͠ • (Opt)BroadcastChannelܥΛআ͢Δ४උ͕ͬͨ • (Opt)͜ͷ࠶࣮ͷ͓͔͛ͰsemaphoremutexपΓͷվળೖͬͯ ͍Δ
͍͞͝ʹ ࢿྉ࡞ͬͯͨΒ1.7.1ϦϦʔε͞Εͨ😂
Ҿ༻ • https://github.com/Kotlin/kotlinx.coroutines/releases/tag/1.7.0 • https://github.com/Kotlin/kotlinx.coroutines/issues/3621 • https://github.com/Kotlin/kotlinx.coroutines/pull/3103 • https://arxiv.org/abs/2211.04986