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٢঵ࣉQNͱ͍͏ ςοΫΠϕϯτΛ ೥ؒଓ͚͖ͯͨ࿩ Gotanda.pm 18 2018/6/11 Magnolia.K

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ࣗݾ঺հ Twitter: @magnolia_k_ GitHub: magnolia-k Blog: http://blog.magnolia.tech

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٢঵ࣉͷํ͔Βདྷ·ͨ͠

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٢঵ࣉQNͱ͍͏ΠϕϯτΛ΍͍ͬͯ·͢ w ϲ݄ʹҰճɺฏ೔༵ۚ೔ͷ໷ʹ։࠵ʢ೥Ͱճʣ w ςʔϚ͸ຖճ؇΍͔ʹઃఆ
 ʢྫΤϯδχΞϦϯάͰղܾͨ͜͠ͱɺ͠ͳ͔ͬͨ͜ͱ  w τʔΫຊɺ-5ຊͷߴີ౓ਐߦ ΄΅ۭ͖࣌ؒ͸ແ͠  w ࢀՃ͸ਓલޙɺ࠙਌ձ΁ͷࢀՃ཰͕ߴ͍ ׂʙׂ  w ౦ژͷ੢ʹ΋ΤϯδχΞ͕ଟ͍ͱ࢝Ίͨ ԕํ͔ΒͷࢀՃऀ΋ଟ͍  w 1FSMͷ࿩Λ͢Δ࣌͸ʮ1FSMͷ࿩Λ͠·͢ʯͱલஔ͖͕ೖΔ
 QNͳͷʹʜ

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Πϕϯτͷ܏޲ɾಛ௃ w ຖճඞͣ৽نͷొஃऀ͕ొ৔͢Δ w ਓલͰॳΊͯ஻Δਓ΋ଟ͍ɺΤϯδχΞ͡Όͳ͍ਓ΋஻Δ w ࢀՃऀ΋৽نͷํ͕͘Β͍ w ಛఆͷςΫϊϩδʔʹݶΒͣɺొஃͷωλ͸ଟذʹ౉Δ w աڈͷεϥΠυ͸ͪ͜ΒΛࢀর
 IUUQTLJDIJKPKJQNDPOOQBTTDPN

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ͳͥQNΠϕϯτΛ ͣͬͱ։࠵͍ͯ͠Δ͔ʁ

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w ςΫϊϩδʔͷੈք͸ɺ࣍ʑͱ৽͍͠΋ͷ͕ग़ͯ͘Δ w χονͳςΫϊϩδʔ͕ಥવϝδϟʔʹͳΔٯస͕ܶ༗Δ
 Ծ૝Խɺؔ਺ܕݴޠɺίϯςφʜ w ҰํͰɺίϯϐϡʔλαΠΤϯε͸جૅٕज़ͱͯ͠େࣄ w ͭͷݴޠɺͭͷϥΠϒϥϦΛݱ৔Ͱशಘ͓͚ͯ͠͹
 Ұੜ৯͑·͢ɺΈ͍ͨͳ࣌୅Ͱ͸ͳ͍

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w ֶͿ΂͖ର৅͸͋·Γʹଟ͍ w ͔͠͠ɺඞཁʹͳ͔ͬͯΒֶͼ࢝ΊΔͱɺ஗͍
 ʢʮ஗ԆධՁʯͰ͸ؒʹ߹Θͳ͍ʣ w Ұ൪ා͍ͷ͸ʮ஌Βͳ͍͜ͱʯΛ஌Βͳ͍͜ͱ w ʮ౤ػత࣮ߦʯͰඞཁͱͳΔલʹֶΜͰ͓͔͘͠ͳ͍

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౤ػత࣮ߦ IUUQTKBXJLJQFEJBPSHXJLJ౤ػత࣮ߦ ౤ػత࣮ߦʢͱ͏͖͖ͯͬ͜͡͏ɺӳ: speculative executionʣͱ͸ɺίϯϐϡʔλʹඞཁͱ͠ͳ͍͔΋͠Ε ͳ͍࢓ࣄΛͤ͞Δ͜ͱͰ͋Δɻ͜ͷੑೳ࠷దԽٕ๏͸ɺ ύΠϓϥΠϯԽ͞ΕͨϓϩηοαͳͲͷγεςϜͰ࢖Θ Ε͍ͯΔ

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ແବʹͳΔ͔΋͠Εͳ͍͚Ͳɺ དྷͨΔ΂͖೔ʹඋ͑ͯɺ ֶΜͰ͓͔͘͠ͳ͍ ʢಛʹϦʔμʔ͸ʣ

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Ͱ΋ࠓͷςΫϊϩδʔͷੈք͸ɺ ͋·Γʹଟذʹ౉Γ͗ͯͯ͢ɺ Ͳ͔͜ΒखΛ͚͍͍ͭͯͷ͔෼͔Βͳ͍

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ҰਓͰٕज़ॻಡΜͰ΋ ςϯγϣϯ্͕Βͳ͍ ͦ΋ͦ΋ͲΕಡΜͰ͍͍͔ʜ

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ࣗ෼ͷؾ࣋ͪΛʮࠓͷʯٕज़ʹ ڧ੍తʹৼΓ޲͔ͤΔ ؀ڥΛ༻ҙ͢Δʂ

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ςοΫΠϕϯτΛ։͍ͯɺ ৭ΜͳΤϯδχΞͷ࿩Λ ఆظతʹฉ͘ػձΛ࡞Δʂ

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w ΠϕϯτΛ։͚͹ɺ৭ΜͳΤϯδχΞͱ஌Γ߹͑Δ w ొஃऀͷ۩ମతͳܦݧ΍ߟ͑ํ͕ฉ͚Δ w ͨ͘͞ΜͷΤϯδχΞͱ࿩͢ͱɺͦͷ࣌ʑͷٕज़ಈ޲ͷ
 ʮྲྀΕʯ͕Ωʔϫʔυͱͯ͠ݟ͑ͯ͘Δ w ͋Δ೔ಥવɺਆٕज़͕ݱΕΔ͜ͱ͸ͳ͍ʜগͣͭ͠࿩୊ʹ
 ڍ͕Δ࢝ΊΔʜલͷٕज़ͱͷ࿈ଓੑ͕͋Δʜ w ྲྀΕΛԡ͓͑ͯ͘͞ͱɺྫ͑͹ϒϩάͱ͔ɺ͸ͯͿͱ͔ɺ
 ̡̩ͰྲྀΕͯ͘Δ๲େͳΩʔϫʔυͷ͏ͪɺͲ͔͜ΒखΛ
 ͚͍͚ͭͯ͹͍͍͔ݟ͑ͯ͘Δ

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ʮࠓʯ౤ػత࣮ߦΛߦ͏΂͖ λʔήοτ͕ݟ͔ͭΔʂ ʢ͔΋ʜʣ

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͋ͱ࠷ۙͷ٢঵ࣉQNͰ͸ΤϯδχΞͱͯ͠ͷ ৼΔ·͍ʹؔ͢ΔɺϚΠϯυηοτతͳτʔΫ ͕ଟͯ͘ɺͦΕ΋৭ʑͳҙຯͰࢀߟʹͳΔ

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ग़ձ͍͕ଟ͍͠ɺֶͼ΋ଟ͍ ΈΜͳ΋ͥͻ ςοΫΠϕϯτΛ΍Ζ͏ʂ

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·ͱΊ wςΫϊϩδʔͷमಘ͸౤ػత࣮ߦͰ wࣗ෼ͷ๬Ή؀ڥ͸ࣗ෼Ͱ࡞ͬͯΈΑ͏ wͱΓ͋͑ͣ৭ΜͳਓʹձͬͯΈΑ͏

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ʮ͜Μͳωλɺൃද͢Δ৔ॴ͕ແ͍ʯ ͱ͍͏ํ͸ͥͻ٢঵ࣉQN΁

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٢঵ࣉQNͷ։࠵৘ใ͸ͪ͜ΒΛνΣοΫʂ http://kichijojipm.hatenablog.com/ https://kichijojipm.connpass.com https://twitter.com/kichijojipm

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@ytnobody++++ ँࣙ

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͓͠·͍