Optimizing Ruby with JIT

by Takashi Kokubun

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Optimizing Ruby with JIT Builderscon 2019 / Takashi Kokubun ࠷଎ͷݴޠΛ໨ࢦͯ͠

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Ruby 2.6 ͔ΒJITΛ։ൃ

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΍Γ·ͨ͠ [Misc #16094]

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(࠷దԽࢹ఺Ͱͷ) Rubyͷಛ௃

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1. ϝιου΋ఆ਺΋࠶ఆٛ͠์୊ 1 + 1 #=> 100

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1. ϝιου΋ఆ਺΋࠶ఆٛ͠์୊ 1 + 1 #=> 100

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1. ϝιου΋ఆ਺΋࠶ఆٛ͠์୊ 1 + 1 #=> 100

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2. ߦ͕ਐΉͱ೚ҙͷ͜ͱ͕ى͖Δ a = 1 + 1

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2. ߦ͕ਐΉͱ೚ҙͷ͜ͱ͕ى͖Δ a = 1 + 1 a #=> 2

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2. ߦ͕ਐΉͱ೚ҙͷ͜ͱ͕ى͖Δ a = 1 + 1 a #=> 2 a #=> 100 !?

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2. ߦ͕ਐΉͱ೚ҙͷ͜ͱ͕ى͖Δ

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2. ߦ͕ਐΉͱ೚ҙͷ͜ͱ͕ى͖Δ ʮ3ߦ໨ʹୡͨ͠Β a = 100ʯ

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3. ଞʹ΋ָ͍͠ػೳ͕͍ͬͺ͍ • eval • ଋറ΍؀ڥͷΦϒδΣΫτԽ (binding, Proc) • ೚ҙΦϒδΣΫτͷྻڍػೳ (ObjectSpace) • Φʔόʔϑϩʔ͢Δͱܕ͕มΘΔ੔਺ • ΞυϨεมΘΓ์୊ͷώʔϓྖҬ (GC.compact)

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ຊ೔ͷΰʔϧ ͜ͷ࠷దԽ͕ࠔ೉ͳݴޠΛ ݶք·Ͱߴ଎Խ͢Δ ָ͠͞Λମݧ͍ͯͨͩ͘͠

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RubyΠϯλϓϦλͷ͘͠Έ

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1. RubyͷίʔυΛಡΈࠐΉ

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2. ύʔεͯ͠ߏจ໦ʹ͢Δ EFGUXP

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3. ίϯύΠϧ໋ͯ͠ྩྻʹ͢Δ EFGUXP UXP QVUPCKFDU QVUPCKFDU TFOE MFBWF

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4. VMͰ໋ྩྻΛ࣮ߦ͢Δ EFGUXP UXP QVUPCKFDU QVUPCKFDU TFOE MFBWF 7JSUVBM.BDIJOF ελοΫ

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4. VMͰ໋ྩྻΛ࣮ߦ͢Δ EFGUXP UXP QVUPCKFDU QVUPCKFDU TFOE MFBWF 7JSUVBM.BDIJOF ελοΫ

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4. VMͰ໋ྩྻΛ࣮ߦ͢Δ EFGUXP UXP QVUPCKFDU TFOE MFBWF 7JSUVBM.BDIJOF ελοΫ

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4. VMͰ໋ྩྻΛ࣮ߦ͢Δ EFGUXP UXP TFOE MFBWF 7JSUVBM.BDIJOF ελοΫ

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4. VMͰ໋ྩྻΛ࣮ߦ͢Δ EFGUXP UXP MFBWF 7JSUVBM.BDIJOF ελοΫ

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͜ͷϑΣʔζͷڍಈΛ଎͍ͨ͘͠ EFGUXP UXP QVUPCKFDU QVUPCKFDU TFOE MFBWF 7JSUVBM.BDIJOF ελοΫ

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5. JIT ίϯύΠϥͰߴ଎Խ͢Δ UXP QVUPCKFDU QVUPCKFDU TFOE MFBWF 7JSUVBM.BDIJOF ελοΫ +*5

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5. JIT ίϯύΠϥͰߴ଎Խ͢Δ UXP QVUPCKFDU QVUPCKFDU TFOE MFBWF 7JSUVBM.BDIJOF ελοΫ +*5 ࠓͷͱ͜Ζ *OUFHFS ࠶ఆٛ͞Εͯͳ͍ͳ

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5. JIT ίϯύΠϥͰߴ଎Խ͢Δ UXP QVUPCKFDU QVUPCKFDU TFOE MFBWF 7JSUVBM.BDIJOF ελοΫ +*5 ͳͷͰ͸

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5. JIT ίϯύΠϥͰߴ଎Խ͢Δ UXP QVUPCKFDU QVUPCKFDU TFOE MFBWF 7JSUVBM.BDIJOF ελοΫ +*5 ͍΍ɺ͕࠶ఆٛ ͞ΕͨΒ͔΋

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5. JIT ίϯύΠϥͰߴ଎Խ͢Δ UXP QVUPCKFDU QVUPCKFDU TFOE MFBWF 7JSUVBM.BDIJOF ελοΫ +*5

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5. JIT ίϯύΠϥͰߴ଎Խ͢Δ UXP QVUPCKFDU QVUPCKFDU TFOE MFBWF 7JSUVBM.BDIJOF ελοΫ +*5

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JITͰͲͷ͘Β͍଎͘ͳΔͷ͔

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JITʹ͓͚Δੑೳ޲্ NES emulator: github.com/mame/optcarrot fps 0 23 46 69 92 2.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 34.2 Details: https://gist.github.com/k0kubun/0337e1f40b146b2cae7b7c8e6a79973a 1.0x Version

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JITʹ͓͚Δੑೳ޲্ NES emulator: github.com/mame/optcarrot fps 0 23 46 69 92 2.0 2.1 2.2 2.3 0.0 0.0 0.0 0.0 39.1 37.9 37.8 34.2 Details: https://gist.github.com/k0kubun/0337e1f40b146b2cae7b7c8e6a79973a 1.1x Version

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JITʹ͓͚Δੑೳ޲্ NES emulator: github.com/mame/optcarrot fps 0 23 46 69 92 2.0 2.1 2.2 2.3 2.4 2.5 0.0 0.0 49.0 46.2 39.1 37.9 37.8 34.2 Details: https://gist.github.com/k0kubun/0337e1f40b146b2cae7b7c8e6a79973a 1.4x Version

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JITʹ͓͚Δੑೳ޲্ NES emulator: github.com/mame/optcarrot fps 0 23 46 69 92 2.0 2.1 2.2 2.3 2.4 2.5 2.6 0.0 55.9 49.0 46.2 39.1 37.9 37.8 34.2 Details: https://gist.github.com/k0kubun/0337e1f40b146b2cae7b7c8e6a79973a 1.6x Version

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JITʹ͓͚Δੑೳ޲্ NES emulator: github.com/mame/optcarrot fps 0 23 46 69 92 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.6 JIT 85.8 55.9 49.0 46.2 39.1 37.9 37.8 34.2 Details: https://gist.github.com/k0kubun/0337e1f40b146b2cae7b7c8e6a79973a 2.5x Version

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͜ͷ͕ࠩग़Δཧ༝Λݟ͍͖ͯ·͢ NES emulator: github.com/mame/optcarrot fps 0 23 46 69 92 2.6 2.6 JIT 85.8 55.9 0.0 0.0 0.0 0.0 0.0 0.0 Details: https://gist.github.com/k0kubun/0337e1f40b146b2cae7b7c8e6a79973a Version

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JITίϯύΠϥ͸ͲͷΑ͏ʹ ߴ଎ԽΛ͢Δ͔?

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JITͷجૅ0 ػցޠʹ͚ͨͩ͠Ͱ͸ ଎͘ͳΒͳ͍

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VM࣮ߦ → ػցޠ ͰͷੑೳมԽ NES emulator: github.com/mame/optcarrot fps 0 23 46 69 92 2.6 native 2.6 JIT 85.8 55.9 ? (-O3 w/ VM໋ྩΠϯϥΠϯԽͳ͠)

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VM࣮ߦ → ػցޠ ͰͷੑೳมԽ NES emulator: github.com/mame/optcarrot fps 0 23 46 69 92 2.6 native 2.6 JIT 85.8 56.2 55.9 (-O3 w/ VM໋ྩΠϯϥΠϯԽͳ͠)

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ػցޠʹ͚ͨͩ͠Ͱ͸଎͘ͳΒͳ͍ • VMͷ࣮૷͕ͦ΋ͦ΋ػցޠͰಈ͍͍ͯΔ • VMͰ࣮૷͞Ε͍ͯΔෳࡶͳॲཧΛ؆ུԽͰ͖ͳ ͚Ε͹଎͘ͳΒͳ͍

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VMͷதͰ͸Կ͕ى͖͍ͯΔ͔ (Ͳ͕͜଎͘Ͱ͖ͦ͏Ͱ͠ΐ͏͔?)

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RubyͷJIT͸CίϯύΠϥΛ࢖͏ • ࣮ߦ࣌ʹCίϯύΠϥΛ࣮ߦͯ͠ಈతϥΠϒϥϦ Λੜ੒ɺಈతϩʔυ • ϝϦοτ: Ҡ২ੑͷ୲อ͕ͦΕͳΓʹָɺෳ਺ ͷ࠷దԽόοΫΤϯυΛ࢖͑Δ • σϝϦοτ: JITίϯύΠϧத·͋·͋Ϧιʔε Λ࢖͏ɺϓϩηε΍γάφϧͷѻ͍͕൥ࡶʹͳ Δ

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RubyͷJIT͸CίϯύΠϥΛ࢖͏ • CίϯύΠϥ͸ී௨ͷCͷίʔυͰ࠷దԽͰ͖Δൣ ғ͔͠࠷దԽͰ͖ͳ͍ • Rubyಛ༗ͷಛผͳॲཧΛऔΓআ͘ͷ͸େମࣗ෼ Ͱ࣮૷͢Δ͔͠ͳ͍

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ίϯύΠϥͷ࠷దԽʹΑΔߴ଎Խ NES emulator: github.com/mame/optcarrot fps 0 23 46 69 92 2.6 native com piler 2.6 JIT 85.8 62.5 56.2 55.9 (-O3 w/ VM໋ྩΠϯϥΠϯԽ͋Γ)

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JITͷجૅ1 ϓϩάϥϜΧ΢ϯλͷ࠷దԽ

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ϓϩάϥϜΧ΢ϯλͷ࠷దԽ • VMͷϓϩάϥϜΧ΢ϯλͷҙٛͷҰͭ͸VM໋ྩ σΟεύον͕ͩɺ͜Ε͸ෆཁʹͳ͍ͬͯΔ • Ͱ͸ɺϓϩάϥϜΧ΢ϯλಈ͔͞ͳͯ͘΋͍͍͔?

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ϓϩάϥϜΧ΢ϯλͷ࠷దԽ • ଞͷϓϩάϥϜΧ΢ϯλͷ༻్: • ྫ֎ͷΩϟονςʔϒϧʹ࢖ΘΕΔ • ྫ֎͕ͳ͘ͱ΋ߦ൪߸ͷܭࢉʹ࢖ΘΕΔ

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ϓϩάϥϜΧ΢ϯλͷ࠷దԽ NES emulator: github.com/mame/optcarrot fps 0 23 46 69 92 2.6 native com piler pc 2.6 JIT 85.8 62.7 62.5 56.2 55.9

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JITͷجૅ2 ελοΫϙΠϯλͷ࠷దԽ

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ελοΫϙΠϯλͷ࠷దԽ • VMͷελοΫϙΠϯλͷҙٛ͸VMͷελοΫͷ ૢ࡞ʹ͋Δ • ωΠςΟϒͳελοΫ΍ϨδελͰಉ͡ૢ࡞Λ࣮ ݱͯ͠ελοΫϙΠϯλΛ΍ΊΒΕͳ͍͔?

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ελοΫϙΠϯλͷ࠷దԽ • ϝιουݺͼग़͢͠Δࡍʹ͸VMͷελοΫʹ໭ ͞ͳ͍ͱݺͼग़ͨ͠ϝιου͔ΒࢀরͰ͖ͳ͍ • େҬ୤ग़ޙʹ࢖ΘΕΔ

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ελοΫϙΠϯλͷ࠷దԽ NES emulator: github.com/mame/optcarrot fps 0 23 46 69 92 2.6 native com piler pc sp 2.6 JIT 85.8 66.4 62.7 62.5 56.2 55.9

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·͔ͩͳΓ͕ࠩ͋Δ NES emulator: github.com/mame/optcarrot fps 0 23 46 69 92 2.6 native com piler pc sp 2.6 JIT 85.8 66.4 62.7 62.5 56.2 55.9

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Ͳ͏ͨ͠Βߋʹ଎͘ͳΔͷ͔? • PC/SPͷૢ࡞͸ผʹϘτϧωοΫͰ͸ͳ͍ͷͰ͜ ΕͰ͸଎͘ͳΒͳ͍ • Ή͠ΖRubyͷಈతͳಛੑͷαϙʔτͷͨΊʹ೉͠ ͘ͳ͍ͬͯΔ࠷దԽΛ࣮ݱ͢Δํ͕ॏཁ

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JITͷڧΈΛੜ͔ͨ͠࠷దԽ

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JITͷԠ༻1 ϝιουΠϯϥΠϯԽ

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ϝιουΠϯϥΠϯԽ • 1+1Λܭࢉ͢ΔΑΓ΋Rubyͷϝιουݺͼग़͠ॲ ཧͷํ͕ෳࡶ • ϝιουݺͼग़͠ͷΦʔόʔϔουΛແʹͰ͖ ͳ͍͔? => ΠϯϥΠϯԽ

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ϝιουΠϯϥΠϯԽ • ΠϯϥΠϯԽ͢ΔͱɺίʔϧελοΫͷૢ࡞͕ͳ ͘ͳΔ͚ͩͰͳ͘ɺϝιουݺͼग़͠Λӽ͑ͯ࠷ దԽ͕ޮ͘ • ͔͠͠ΠϯϥΠϯԽͨ͠ޙਖ਼͍͠ڍಈʹద੾ʹ෮ ؼͰ͖Δඞཁ͕͋Δ • “Deoptimization” ͱ͍͏

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Rubyͷϝιουݺͼग़͠ͷ͘͠Έ • άϩʔόϧϝιουΩϟογϡͱΠϯϥΠϯϝ ιουΩϟογϡ͕͋Δ • ΠϯϥΠϯϝιουΩϟογϡ͸શͯͷcall siteʹ ରͯ͠ଘࡏ͢Δ • ͜ΕΛDeoptimizationʹ࢖͏

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ϝιουΠϯϥΠϯԽ • ΠϯϥΠϯԽ͢Δϝιου಺Ͱߦ൪߸Λऔಘͨ͠ Γྫ֎͕ඈΜͩΓ͠ͳ͍͜ͱΛอূ͠ͳ͍ͱ͍͚ ͳ͍ • VM໋ྩͷϝλσʔλΛ༻ҙ͓ͯ͘͠

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ϝιουΠϯϥΠϯԽ

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ϝιουΠϯϥΠϯԽ NES emulator: github.com/mame/optcarrot fps 0 23 46 69 92 2.6 native com piler pc sp inline 2.6 JIT 85.8 72.4 66.4 62.7 62.5 56.2 55.9

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JITͷԠ༻2 Πϯελϯεม਺ͷ࠷దԽ

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Πϯελϯεม਺ͷ࠷దԽ • Πϯελϯεม਺ΛಡΉʹ͸Կ౓͔ϝϞϦͷϩʔ υΛ͠ͳ͍ͱ͍͚ͳ͍ => ஗͍ • ຊདྷϩʔυ͠ͳ͍ͱ͍͚ͳ͍஋ΛJITੜ੒ίʔυ಺ Ͱ͸ଈ஋ʹͰ͖ͳ͍͔?

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RubyͷΠϯελϯεม਺ͷ͘͠Έ • Ϋϥε͝ͱʹɺ͋ΔΠϯελϯεม਺͕֨ೲ͞Ε ͍ͯΔΠϯσοΫε͕ҟͳΔ • ܧঝͯ͠ಉ໋͡ྩྻ͕ڞ༗͞Ε͍ͯΔͱյΕΔ

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Πϯελϯεม਺ͷ࠷దԽ • ϝιουΠϯϥΠϯԽͱಉ༷ͷํ๏Ͱ Deoptimization͢Δ • Ճ͑ͯɺ༨ܭͳϒϥϯνΛ࡟Δ͜ͱͰίϯύΠϥ ͷ࠷దԽ͕ޮ͖΍͘͢͢Δ

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Πϯελϯεม਺ͷ࠷దԽ

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Πϯελϯεม਺ͷ࠷దԽ NES emulator: github.com/mame/optcarrot fps 0 23 46 69 92 2.6 native com piler pc sp inline ivar 2.6 JIT 85.8 85.8 72.4 66.4 62.7 62.5 56.2 55.9

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Ruby͸·ͩਐԽΛ࢒͍ͯ͠Δ (TrufﬂeRuby ͸ 170fps ग़Δ)

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·ͱΊ • Ruby͸࠷଎ͷݴޠͱͳΓಘΔ͔ʁ • ଞͷݴޠͰ΋ॻ͚Δίʔυ͸ɺେ఍͸ͦΕ૬౰ ʹ࠷దԽͰ͖Δ • Rubyಛ༗ͬΆ͍ݴޠػೳ͸અ౓ͷ͋Δར༻Λ