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その ionice、ほんとに効いてますか?
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Narimichi Takamura
September 12, 2014
Technology
0
320
その ionice、ほんとに効いてますか?
2014/08/14、社内勉強会の資料です。
Narimichi Takamura
September 12, 2014
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Transcript
ͦͷ IONICE, ΄Μͱʹޮ͍ͯ·͔͢ʁ TAKAMURA Narimichi @nari_ex hbstudy-2014-08-14
what is ionice ? I/O ͷॲཧ༏ઌΛࢦఆ͢ΔLinuxίϚϯυ nice ίϚϯυͷ I/O όʔδϣϯ
nice ίϚϯυͰ I/O ༏ઌΛ੍ޚෆՄ
I/O ༏ઌΫϥε RT ( Real-time ) ࠷ߴ༏ઌ BE ( Best-Effort
) σϑΥϧτ༏ઌ Idle ࠷༏ઌ
BE: Ϋϥε༏ઌ BE ΫϥεͷΈɺΫϥε༏ઌ͕͋Δ ༏ઌ 0ʙ7 ·Ͱͷ 8ஈ֊ 0͕࠷ߴ༏ઌɺ7͕࠷༏ઌ ༏ઌΫϥεͷΛ͑ͳ͍
RT > BE (0) IDLE < BE (7)
None
How to ionice RT ΫϥεΛࢦఆ: ionice -c1 BE ΫϥεΛࢦఆ: ionice
-c2 -n <0ʙ7> IDLE ΫϥεΛࢦఆ: ionice -c3
༨ஊ: nice ίϚϯυ Ϋϥεͳ͍ ༏ઌ ( nice ) -20ʙ19
-20 ͕࠷ߴ༏ઌɺ19͕࠷༏ઌ
ෛՙΛ࠷খݶʹ͍͑ͨʂ
ionice, nice Λۦͯ͠…
# ionice -c3 nice -n19
͜ΕͰᘳͩʂʂʂ
None
ͪΐͬͱ·ͬͯ
ͦͷ IONICE, ΄Μͱʹޮ͍ͯ·͔͢ʁ
None
ionice ͕ޮ݅͘ I/O εέδϡʔϥ ReadͳͷʁWriteͳͷʁϑϥάʁ ϑΝΠϧ࡞ϑϥά Ωϟογϡͷ༗ແ
I/O Scheduler…
VFS Χʔωϧۭؒ γεςϜίʔϧ Ϣʔβۭؒ ཧ σόΠε ϑΝΠϧγεςϜ σΟεΫΩϟογϡ ൚༻ϒϩοΫ ཧ
σόΠε ϓϩηε I/Oεέδϡʔϥ σόΠε υϥΠό σόΠε υϥΠό
݅ͦͷ̍: I/O Scheduler(1) CFQ εέδϡʔϥҎ֎ແཧ Linux ඪ४ͷεέδϡʔϥ CFQ Amazon Linux
Noop ͳͷͰҙ Unbreakable Linux Deadline ͳ ͷͰҙ
σόΠεͻͱͭʹI/Oεέδϡʔϥͻͱͭ σόΠεΛ·͙ͨॲཧͷ߹ʹҙ ॲཧʹؔΘΔͯ͢ͷσόΠεΛ֬ೝͤΑ # cat /sys/block/<DEV_NAME>/queue/ scheduler ݅ͦͷ̍: I/O Scheduler(2)
݅ͦͷ̎: I/Oॲཧͷ༰(1) Write() جຊతʹޮ͔ͳ͍ O_DIRECT, O_SYNC Λϑϥάཱͯ ͯΕOK -o sync
ͰϚϯτ͞ΕͨϑΝΠϧ γεςϜͳΒOK
݅ͦͷ̎: I/Oॲཧͷ༰(2) Read() ͯ͢ʹޮ͘Θ͚Ͱͳ͍ σΟεΫΩϟογϡ͕͋Δͱμϝ σΟεΫΞΫηεͳ͍͔Βવ
·ͱΊ ionice ҎԼͷ ̎݅Λຬͨͨ࣌͠ʹͪΌΜͱಈ͘ I/O Scheduler ͕ CFQ ಛఆͷI/Oॲཧ Ωϟογϡ͞Ε͍ͯͳ͍ϑΝΠϧͷRead
ಛघϑϥάͷཱͬͨ Write
͍͞͝ʹ man ioprio_set Λಡ͏ ϑΝΠϧ࡞ϑϥάͷࡉ͔͍͜ͱ·ͨࠓ O_SYNC, O_DSYNC, O_FSYNC… ionice -p
<PID> Λ͏ͱɺىಈதͷϓϩη εͷI/O༏ઌมߋͰ͖ΔΑ