Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
その ionice、ほんとに効いてますか?
Search
Narimichi Takamura
September 12, 2014
Technology
0
390
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
Tweet
Share
More Decks by Narimichi Takamura
See All by Narimichi Takamura
インシデントキーメトリクスによるインシデント対応の改善 / Improving Incident Response using Incident Key Metrics
nari_ex
1
11k
組織的なインシデント対応を目指して〜成熟度評価と改善のステップ〜 / Towards an Organized Incident Response - Maturity Assessment and Improvement Steps -
nari_ex
7
8.9k
Waroomの開発モチベーションと今後のロードマップ / Waroom development motivation and roadmap
nari_ex
1
1.6k
Engineering with Business Impact
nari_ex
2
310
How We Foster Reliability in Diversity
nari_ex
14
13k
SRE Practices in Organizations
nari_ex
16
10k
Hardening におけるトラブルシューティング / Troubleshooting in Hardening
nari_ex
1
360
私が Engineering Manager になるまでに経験してきたこと、大切にしてきたこと / Lecture materials for Introduction to Venture Business at UEC
nari_ex
0
250
運用技術者組織の設計と運用 / Design and operation of operational engineer organization
nari_ex
11
10k
Other Decks in Technology
See All in Technology
Shirankedo NOCで見えてきたeduroam/OpenRoaming運用ノウハウと課題 - BAKUCHIKU BANBAN #2
marokiki
0
130
BtoBプロダクト開発の深層
16bitidol
0
270
20201008_ファインディ_品質意識を育てる役目は人かAIか___2_.pdf
findy_eventslides
0
120
Green Tea Garbage Collector の今
zchee
PRO
2
390
いま注目しているデータエンジニアリングの論点
ikkimiyazaki
0
590
研究開発部メンバーの働き⽅ / Sansan R&D Profile
sansan33
PRO
3
20k
成長自己責任時代のあるきかた/How to navigate the era of personal responsibility for growth
kwappa
3
270
Flaky Testへの現実解をGoのプロポーザルから考える | Go Conference 2025
upamune
1
420
extension 現場で使えるXcodeショートカット一覧
ktombow
0
210
GopherCon Tour 概略
logica0419
2
190
Why Governance Matters: The Key to Reducing Risk Without Slowing Down
sarahjwells
0
110
KMP の Swift export
kokihirokawa
0
330
Featured
See All Featured
How to train your dragon (web standard)
notwaldorf
96
6.3k
Producing Creativity
orderedlist
PRO
347
40k
How GitHub (no longer) Works
holman
315
140k
Mobile First: as difficult as doing things right
swwweet
224
10k
Fireside Chat
paigeccino
40
3.7k
Intergalactic Javascript Robots from Outer Space
tanoku
273
27k
Imperfection Machines: The Place of Print at Facebook
scottboms
269
13k
Become a Pro
speakerdeck
PRO
29
5.5k
KATA
mclloyd
32
15k
Evolution of real-time – Irina Nazarova, EuRuKo, 2024
irinanazarova
9
960
The Art of Programming - Codeland 2020
erikaheidi
56
14k
How to Ace a Technical Interview
jacobian
280
24k
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