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Golang @ISUCON y_matsuwitter

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!Z@NBUTVXJUUFS Gunosy inc., ࣥߦ໾һ ! Goྺ1೥ऑ͘Β͍ ! όϥϯεϘʔϧਖ਼࠲ͷਓ

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ීஈͷۀ຿ GoʹΑΔAPIαʔόߏங (2014.3~) iOS/AndroidͷΞϓϦ։ൃ Django/RailsʹΑΔWebApp։ൃ

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ʊਓਓਓਓਓਓਓਓਓਓਓਓਓʊ ʼɹGolangΤϯδχΞืूதɹʻ ʉY^Y^Y^Y^Y^Y^Y^Y^Y^Yʉ

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ࠓ೔ͷ࿩ ॳΊͯͷISUCONΛGolangͰઓͬͯΈͨ࿩ ※GolangҎ֎ͷ࿩͸͠·ͤΜ Ґͱத్൒୺ͳ݁ՌͰ͕ͨ͠ʜ

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ISUCONͱ͸ Iikanjini Speed Up CONtest ! 8࣌ؒͰ༩͑ΒΕͨWebAppΛग़དྷΔݶΓߴ ଎Խ͢Δίϯςετ

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༧બ αʔό: 1୆ େ఍͸MySQLΛDB ࠓ೥͸ۜߦͷϩάΠϯϖʔδ͕୊ࡐͰͨ͠

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ܾউ αʔό: 3~4୆ ը૾ॲཧ΍ಈըͷ഑৴ͳͲ͋Δఔ౓ෛՙͷߴ ͍ॲཧΛؚΉWebApp ࠓ೥͸ಈը޿ࠂͷ഑৴αʔόͰͨ͠

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ߴ଎ͳWebαʔόͷͨΊʹ ϦιʔεΛ࢖͍੾Δ CPU … Encode/decode, ը૾ॲཧͳͲ Memory … ϓϩηε্ͷσʔλྔ Data Transfer … αʔόؒɺαʔόΫϥΠΞϯτؒͷ૯௨৴ྔ ! ͦͷ্Ͱద੾ͳॲཧʹϦιʔεΛׂΓ౰ͯΔ

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ݴޠੑೳ͸ ܾఆతͳࠩʹ͸ͳΒͳ͍

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Why Go? վળͷޮ཰ͷߴ͞ - ߏจ͕SimpleͳͨΊ୹࣌ؒͷνʔϜ։ൃ޲͖ - ฒྻɾฒߦॲཧͰͷϝϞϦपΓͷѻָ͍͕ - σϓϩΠָ͕ - ඪ४ύοέʔδ͕ඇৗʹ࣮༻త

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औΓ૊Μͩ͜ͱ 1. ϓϩηεΩϟογϡ 2. λεΫ෼ࢄॲཧ

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ϓϩηεΩϟογϡ σʔλΛϓϩηε্ʹશͯอ͓࣋ͯ͘͠ ! ӬଓԽ͸ద౓ͳλΠϛϯάͰRedisʹอଘͳ ΓϑΝΠϧʹdumpͳΓ͢Δ

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੔߹ੑ ౰વɺෳ਺ͷGoroutine͔ΒಡΈॻ͖͞ΕΔ ͨΊ஋ͷ੔߹ੑΛอূ͢Δඞཁ͕͋Δ

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Race Condition ڝ߹͢Δม਺ૢ࡞Λߦ͏ͱෆ҆ఆͳڍಈ Goroutine·͍ͨͰڞ༗ͷ஋ΛಡΈॻ͖͢Δ ࡍ͸race conditionΛආ͚ΔͨΊLock͕ඞཁ

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sync ֤छͷϩοΫΛѻ͏ύοέʔδ ! sync.RWMutex - ReadΛWriteͰϩοΫϨϕϧΛ෼཭ͨ͠Lock sync/atomic - Χ΢ϯλͳͲͷॲཧΛ࡞Δͷʹॏๅ

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atomic.Value from golang1.4 ! ϓϩηε্ʹatomicʹσʔλߋ৽Ͱ͖Δετ Ξͱͯ͠ઃܭ͞Ε͍ͯ·͢

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ಡΈࠐΈଆ͸7BMVF͔Β-PBE

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ॻ͖ࠐΈଆ͸-PDLऔͬͨ͋ͱ 7BMVFʹ4UPSF

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λεΫͷ෼ࢄॲཧ ཁ݅ - ॲཧʹ͔͔࣌ؒΔ΋ͷΛඇಉظɺ͔ͭฒߦ࣮ߦ ਺Λ੍ݶ࣮ͯ͠ߦ͍ͨ͠ ! - ը૾ɾಈըͳͲ͸ॏෳͯ͠ॲཧͨ͘͠ͳ͍

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Task Queueing capacity෇͖ͷchannelΛ࢖͏ goroutine͕ͦͷ··workerతʹ࢖͑Δ

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ॏෳॲཧΛආ͚Δ ྫ͑͹ը૾ॲཧதʹɺͦͷը૾Λऔಘ͠ʹདྷ ΔϦΫΤετΛfailͤͯ͞͸ͳΒͳ͍ ! ͔͠͠ɺऔಘ࣌ʹॏෳॲཧ͸͕࣌ؒ໪ମແ͍

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αʔό͕1୆ͷ৔߹

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sync.Cond ॲཧதͷ΋ͷΛબ୒తʹ଴ͭ

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αʔό͕ෳ਺୆ͷ࣌

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y-matsuwitter/mcond ෳ਺୆ͷαʔόؒͰsync.CondΛѻ͑ΔΑ͏ ʹͨ͠΋ͷ ! Redis + net/httpΛར༻

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ೋ୆ͷαʔόͰͷmcond

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ॲཧଆ ಡΈࠐΈଆ

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ॲཧઌΛৼΓ෼͚Δ

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stathat/consistent ίϯγεςϯτϋογϡϥΠϒϥϦ ! Ұఆͷ໊લʹରͯ͠ඞͣಉ͡ॲཧઌΛܾఆ ࠓճ͸ଳҬΛ࢖͍௵ͨ͢Ίෳ਺ͷwebdav αʔόʹৼΓ෼͚Δ༻్Ͱར༻

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ͪͳΈʹ ഊҼ͸Cache-Control HeaderͰͨ͠ IUUQTTV[VSJKQZ@NBUTVXJUUFSUTIJSUNCMBDL

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࠷ޙʹ

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ProductionͰ΋࢖͓͏

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ࢀߟ ඪ४ύοέʔδ http://golang.org/pkg/ go1.4 http://tip.golang.org/doc/go1.4 mcond https://github.com/y-matsuwitter/mcond consistent https://github.com/stathat/consistent