YJITとZJITにはイカなる違いがあるのか？

by yamanao

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͋ͳͨ͸Ͳͬͪ೿ʁ

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ςετษڧͰ… ˒ աڈ໰Λೖखͯ͠ରࡦ͢Δ ˒ ࢼݧൣғͷڭՊॻΛಡΉ

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ςετษڧͰ… ˒ աڈ໰Λೖखͯ͠ରࡦ͢Δ ˒ YJIT ˒ ࢼݧൣғͷڭՊॻΛಡΉ ˒ ZJIT

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YJITͱZJITʹ͸ ΠΧͳΔҧ͍͕͋Δͷ͔ʁ yamano

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˒ yamano (@yamanaoRuby) ˒ େֶ 4 ೥ੜ ˒ RubyKaigi ͸ 2 ճ໨ About me

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˒ ࣗ෼͕ཧղ͍ͯ͠ΔൣғͰ࿩͠·͢ ˒ ݶΒΕͨ࣋ͪ࣌ؒͷதͰɺΠϝʔδ͕఻ΘΔΑ͏ʹ ˒ RubyKaigi·ͰͷཧղͷҰॿʹ͍͚ͯͨͩ͠Ε͹ ˒ ؾʹͳͬͨ఺͕͋Ε͹ੋඇ͝ࢦఠ͍ͩ͘͞ ˒ Ճචमਖ਼ͯ͠هࣄʹ͢Δͭ΋ΓͰ͢ ͜ͷLTʹ͍ͭͯ

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˒ Just-In-Time ͷུ ˒ ίʔυ಺ͰΑ࣮͘ߦ͞ΕΔܦ࿏ΛɺඞཁͳλΠϛϯάͰ ίϯύΠϧ͢Δ ˒ ͦ΋ͦ΋Ruby͸ΠϯλϓϦλܕͷݴޠ ˒ ίϯύΠϧܕͷ଎͞Λ෦෼తʹऔΓೖΕΔ What’s JIT?

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࣮ߦ࣌ͷ৘ใΛ΋ͱʹɺ Α͘ݱΕΔέʔεʹ߹Θͤͯہॴతʹ࠷దԽ͢Δ $ ruby --yjit hoge.rb ͷΑ͏ͳܗͰݕূͰ͖Δ YJIT

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YJIT

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YJIT Yʮcount͕IntegerͰདྷΔࣄ͕ଟ͍ͳ…ʯ YʮInteger͕དྷΔલఏͰίϯύΠϧͯ͠ɺ ɹ ߴ଎ʹॲཧͰ͖ΔΑ͏ʹ͓ͯ͜͠͏ʂʯ

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ϝιου୯ҐͰɺ಺෦Ͱѻ͍΍͍͢ܗʹ͔ͯ͠Β ˒ ஋ͷྲྀΕ ˒ ੍ޚϑϩʔ ͳͲͷ৘ใΛ΋ͱʹ࠷దԽ͢Δ $ ruby --zjit hoge.rb ͷΑ͏ͳܗͰݕূͰ͖Δ ZJIT

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ZJIT

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ZJIT ZʮશମΛݟͯΈΑ͏ʯ Zʮ΋͔ͯ͠͠ɺ ɹ ݁ہ͜Ε͸ count * 200 + 500 Ͱ͸ʁʯ ※ΠϝʔδͰ͢

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ςετษڧͷͨͱ͑ ˒ YJIT ˒ աڈ໰ͰରࡦΛ͢ΔͱϐϯϙΠϯτʹֶश͢ΔͷͰૣ͍ ˒ ZJIT ˒ ڭՊॻΛಡΜͰରࡦΛ͢ΔͱΑΓ੔ཧ͞Εͨ஌ࣝʹͳΔ ͲͪΒ͕ྑ͍ͱ͍͏࿩Ͱ͸ͳ͘ɺಘҙͳํ޲ੑ͕ҧ͏

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˒ ZJITͷதؒදݱΛΈͯΈΔ ˒ ΠϯλϓϦλͷΈɾYJITɾZJITͷ଎౓ൺֱ ͳͲΛߦͬͨ ͞ΘͬͯΈͨ

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$ ruby --zjit --zjit-dump-hir-init total_price.rb $ ruby --zjit --zjit-dump-hir total_price.rb ˒ ઌఔͷ total_price ؔ਺Λෳ਺ճ࣮ߦ͢ΔίʔυͰݕূ ZJITͷதؒදݱ

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˒ ࠷దԽલ v34:BasicObject = Send v16, :*, v23 v41:BasicObject = Send v34, :+, v27 Rubyͷϝιουݺͼग़͠Λ͍ͯ͠Δ ˒ ࠷దԽޙ v50:Fixnum = FixnumMult v49, v23 v53:Fixnum = FixnumAdd v50, v27 ΑΓ۩ମతͳ੔਺ԋࢉͷܗʹͳ͍ͬͯΔ ZJITͷதؒදݱ

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͓·͚

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˒ εʔπέʔε͸൒෼Ҏ্ۭͷঢ়ଶͰ ˒ ϊϕϧςΟ౳Ͱຒ·Δ ˒ ࡢ೥͸εʔπέʔε͕ຒ·্ͬͨͰ ख࣋ͪͨ͠ ͓·͚