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ʲଓฤʳͦͷ IONICE ɺ ΄Μͱʹޮ͍ͯ·͔͢ʁ גࣜձࣾϋʔτϏʔπ @nari_ex ߴଜ੒ಓ

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͓͞Β͍ ionice ͸ҎԼͷ ̎৚݅Λຬͨͨ࣌͠ʹͪΌΜͱ ಈ͘ I/O Scheduler ͕ CFQ ಛఆͷI/Oॲཧ Ωϟογϡ͞Ε͍ͯͳ͍ϑΝΠϧ΁ͷRead ಛघϑϥάͷཱͬͨ Write

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ΜɺͳΜͰ(ɾ΁ɾ)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༏ઌ౓Λߟྀͯ͠ ࣮૷͞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 • ظݶʢdeadlineʣ෇͖Ωϡʔ͕ಛ௃ • ظݶ͕੾Εͨཁٻ͸࠷༏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 • ༏ઌ౓Λߟྀͯ͠Ωϡʔ͝ͱͷॲཧ࣌ؒΛܾఆ • ̍ͭͷαϒΩϡʔΛΞΫςΟϒΩϡʔͱͯ͠ɺͦͷ Ωϡʔ಺ͷཁٻΛॲཧ࣌ؒͷൣғͰॲཧ͢Δ • ॲཧ͕࣌ؒऴΘΔͱΞΫςΟϒΩϡʔ͕੾ΓସΘΔ 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 ௿༏ઌ౓ϓϩηεͷαϒΩϡʔ͸ ΞΫςΟϒʹͳ͔ͳ͔ͳΒͳ͍ && ͳͬͯ΋͙͢ʹελϯόΠʹͳΔ

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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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ී௨ͷWRITEʢ஗Ԇ WRITEʣ ϓϩηεۭؒ σΟεΫΩϟογϡ ෺ཧσόΠε ޙͰॻ͖ࠐΈ σΟεΫΩϟογϡʹ ίϐʔΛͯ͠ऴྃ

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ී௨ͷWRITEʢ஗Ԇ WRITEʣ ϓϩηεۭؒ σΟεΫΩϟογϡ ෺ཧσόΠε ޙͰॻ͖ࠐΈ σΟεΫΩϟογϡʹ ίϐʔΛͯ͠ऴྃ ୭͕΍Δͷʁ

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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