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ʲଓฤʳͦͷ IONICE ɺ ΄Μͱʹޮ͍ͯ·͔͢ʁ גࣜձࣾϋʔτϏʔπ @nari_ex ߴଜಓ
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͓͞Β͍ ionice ҎԼͷ ̎݅Λຬͨͨ࣌͠ʹͪΌΜͱ ಈ͘ I/O Scheduler ͕ CFQ ಛఆͷI/Oॲཧ Ωϟογϡ͞Ε͍ͯͳ͍ϑΝΠϧͷRead ಛघϑϥάͷཱͬͨ Write
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ΜɺͳΜͰ(ɾɾ)ʁ
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CFQ ͡Όͳ͍ͱޮ͔ͳ͍ཧ༝
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VFS Χʔωϧۭؒ γεςϜίʔϧ Ϣʔβۭؒ ཧ σόΠε ϑΝΠϧγεςϜ σΟεΫΩϟογϡ ൚༻ϒϩοΫ ཧ σόΠε ϓϩηε I/Oεέδϡʔϥ σόΠε υϥΠό σόΠε υϥΠό I/Oεέδϡʔϥ I/O ͷ֓೦ਤ
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I/O εέδϡʔϥ֓ཁ I/O
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I/O εέδϡʔϥͷ αϒΩϡʔʹ
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݁: CFQ Ҏ֎ɺ༏ઌΛߟྀͯ͠ ࣮͞Εͯͳ͍
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දతͳI/Oεέδϡʔϥ • NOOP • DEADLINE • CFQʢCompletely Fair Queuingʣ
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• ཁٻΛσΟεύονΩϡʔʹಥͬࠐΉ͚ͩ • No Operation NOOP I/O εέδϡʔϥ
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NOOP I/O εέδϡʔϥ I/O શ෦ೖΓͷFIFOΩϡʔ͕͋Δ͚ͩ
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• ReadͱWriteͰΩϡʔ͕ผ • Read ༏ઌ • ظݶʢdeadlineʣ͖Ωϡʔ͕ಛ • ظݶ͕Εͨཁٻ࠷༏ઌͰॲཧ͢Δ DEADLINE I/O εέδϡʔϥ
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DEADLINE I/O εέδϡʔϥ I/O READ ͱ WRITE ͷΩϡʔ͕͋Δ͚ͩ
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• ϓϩηε͝ͱʹαϒΩϡʔΛ༻ҙ • ༏ઌΛߟྀͯ͠Ωϡʔ͝ͱͷॲཧ࣌ؒΛܾఆ • ̍ͭͷαϒΩϡʔΛΞΫςΟϒΩϡʔͱͯ͠ɺͦͷ ΩϡʔͷཁٻΛॲཧ࣌ؒͷൣғͰॲཧ͢Δ • ॲཧ͕࣌ؒऴΘΔͱΞΫςΟϒΩϡʔ͕ΓସΘΔ CFQ I/O εέδϡʔϥ
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CFQ I/O εέδϡʔϥ ϓϩηε͝ͱʹΩϡʔ͕͋Δ I/O …"
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CFQ I/O εέδϡʔϥ I/O …" ΞΫςΟϒʹͳͬͨΩϡʔʹ͋Δ ཁٻ͕ॲཧ͞ΕΔ ༏ઌϓϩηεͷαϒΩϡʔ ΞΫςΟϒʹͳ͔ͳ͔ͳΒͳ͍ && ͳ͙ͬͯ͢ʹελϯόΠʹͳΔ
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ಛఆͷI/O͡Όͳ͍ͱޮ͔ͳ͍ཧ༝
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σΟεΫΩϟογϡͷޮ͍ͨREAD ϓϩηεۭؒ σΟεΫΩϟογϡ ཧσόΠε σΟεΫΩϟογϡͷ σʔλΛฦ͢
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σΟεΫΩϟογϡͷͳ͍READ ϓϩηεۭؒ σΟεΫΩϟογϡ ཧσόΠε
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σΟεΫΩϟογϡͷͳ͍READ ϓϩηεۭؒ σΟεΫΩϟογϡ ཧσόΠε σΟεΫΩϟογϡ࡞ σΟεΫΩϟογϡͷ σʔλΛฦ͢
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ී௨ͷWRITEʢԆ WRITEʣ ϓϩηεۭؒ σΟεΫΩϟογϡ ཧσόΠε ޙͰॻ͖ࠐΈ σΟεΫΩϟογϡʹ ίϐʔΛͯ͠ऴྃ
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ී௨ͷWRITEʢԆ WRITEʣ ϓϩηεۭؒ σΟεΫΩϟογϡ ཧσόΠε ޙͰॻ͖ࠐΈ σΟεΫΩϟογϡʹ ίϐʔΛͯ͠ऴྃ ୭͕Δͷʁ
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ఆظతʹLINUX Χʔωϧ͕ॻ͖ࠐΜͰ·͢ɻ ※͔ͩΒ IONICE ͕ޮ͔ͳ͍
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ఆظతͳಉظॲཧ
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ಛघͳϑϥάͷཱͬͨI/O ϓϩηεۭؒ σΟεΫΩϟογϡ ཧσόΠε ΩϟογϡΛܦ༝ͤͣ σόΠεʹಡΈॻ͖͢Δ
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࣭ίʔφʔ