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
【続編】その ionice、ほんとに効いてますか?
Search
Narimichi Takamura
September 12, 2014
Technology
1
930
【続編】その ionice、ほんとに効いてますか?
2014/09/12 社内勉強会の資料です。前回の資料の続編です。
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
9.8k
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
8.4k
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
9.6k
Hardening におけるトラブルシューティング / Troubleshooting in Hardening
nari_ex
1
340
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
240
運用技術者組織の設計と運用 / Design and operation of operational engineer organization
nari_ex
11
9.8k
Other Decks in Technology
See All in Technology
衛星運用をソフトウェアエンジニアに依頼したときにできあがるもの
sankichi92
1
230
敢えて生成AIを使わないマネジメント業務
kzkmaeda
2
510
United airlines®️ USA Contact Numbers: Complete 2025 Support Guide
unitedflyhelp
0
340
ABEMAの本番環境負荷試験への挑戦
mk2taiga
5
850
Reach American Airlines®️ Instantly: 19 Calling Methods for Fast Support in the USA
flyamerican
1
180
How to Quickly Call American Airlines®️ U.S. Customer Care : Full Guide
flyaahelpguide
0
240
Delegating the chores of authenticating users to Keycloak
ahus1
0
180
ビジネス職が分析も担う事業部制組織でのデータ活用の仕組みづくり / Enabling Data Analytics in Business-Led Divisional Organizations
zaimy
1
310
話題の MCP と巡る OCI RAG ソリューションの旅 - Select AI with RAG と Generative AI Agents ディープダイブ
oracle4engineer
PRO
5
110
AI エージェントと考え直すデータ基盤
na0
18
7.4k
Lufthansa ®️ USA Contact Numbers: Complete 2025 Support Guide
lufthanahelpsupport
0
250
Claude Code に プロジェクト管理やらせたみた
unson
8
5k
Featured
See All Featured
Raft: Consensus for Rubyists
vanstee
140
7k
Building an army of robots
kneath
306
45k
Adopting Sorbet at Scale
ufuk
77
9.5k
Code Review Best Practice
trishagee
69
19k
GitHub's CSS Performance
jonrohan
1031
460k
Chrome DevTools: State of the Union 2024 - Debugging React & Beyond
addyosmani
7
740
Music & Morning Musume
bryan
46
6.7k
How GitHub (no longer) Works
holman
314
140k
Connecting the Dots Between Site Speed, User Experience & Your Business [WebExpo 2025]
tammyeverts
7
330
The Art of Delivering Value - GDevCon NA Keynote
reverentgeek
15
1.6k
Java REST API Framework Comparison - PWX 2021
mraible
31
8.7k
Building Better People: How to give real-time feedback that sticks.
wjessup
367
19k
Transcript
ʲଓฤʳͦͷ IONICE ɺ ΄Μͱʹޮ͍ͯ·͔͢ʁ גࣜձࣾϋʔτϏʔπ @nari_ex ߴଜಓ
͓͞Β͍ ionice ҎԼͷ ̎݅Λຬͨͨ࣌͠ʹͪΌΜͱ ಈ͘ I/O Scheduler ͕ CFQ ಛఆͷI/Oॲཧ
Ωϟογϡ͞Ε͍ͯͳ͍ϑΝΠϧͷRead ಛघϑϥάͷཱͬͨ Write
ΜɺͳΜͰ(ɾɾ)ʁ
CFQ ͡Όͳ͍ͱޮ͔ͳ͍ཧ༝
VFS Χʔωϧۭؒ γεςϜίʔϧ Ϣʔβۭؒ ཧ σόΠε ϑΝΠϧγεςϜ σΟεΫΩϟογϡ ൚༻ϒϩοΫ ཧ
σόΠε ϓϩηε I/Oεέδϡʔϥ σόΠε υϥΠό σόΠε υϥΠό I/Oεέδϡʔϥ I/O ͷ֓೦ਤ
I/O εέδϡʔϥ֓ཁ I/O
I/O εέδϡʔϥͷ αϒΩϡʔʹ
݁: CFQ Ҏ֎ɺ༏ઌΛߟྀͯ͠ ࣮͞Εͯͳ͍
දతͳI/Oεέδϡʔϥ • NOOP • DEADLINE • CFQʢCompletely Fair Queuingʣ
• ཁٻΛσΟεύονΩϡʔʹಥͬࠐΉ͚ͩ • No Operation NOOP I/O εέδϡʔϥ
NOOP I/O εέδϡʔϥ I/O
શ෦ೖΓͷFIFOΩϡʔ͕͋Δ͚ͩ
• ReadͱWriteͰΩϡʔ͕ผ • Read ༏ઌ • ظݶʢdeadlineʣ͖Ωϡʔ͕ಛ • ظݶ͕Εͨཁٻ࠷༏ઌͰॲཧ͢Δ DEADLINE
I/O εέδϡʔϥ
DEADLINE I/O εέδϡʔϥ I/O
READ ͱ WRITE ͷΩϡʔ͕͋Δ͚ͩ
• ϓϩηε͝ͱʹαϒΩϡʔΛ༻ҙ • ༏ઌΛߟྀͯ͠Ωϡʔ͝ͱͷॲཧ࣌ؒΛܾఆ • ̍ͭͷαϒΩϡʔΛΞΫςΟϒΩϡʔͱͯ͠ɺͦͷ ΩϡʔͷཁٻΛॲཧ࣌ؒͷൣғͰॲཧ͢Δ • ॲཧ͕࣌ؒऴΘΔͱΞΫςΟϒΩϡʔ͕ΓସΘΔ CFQ
I/O εέδϡʔϥ
CFQ I/O εέδϡʔϥ ϓϩηε͝ͱʹΩϡʔ͕͋Δ I/O
…"
CFQ I/O εέδϡʔϥ I/O
…" ΞΫςΟϒʹͳͬͨΩϡʔʹ͋Δ ཁٻ͕ॲཧ͞ΕΔ ༏ઌϓϩηεͷαϒΩϡʔ ΞΫςΟϒʹͳ͔ͳ͔ͳΒͳ͍ && ͳ͙ͬͯ͢ʹελϯόΠʹͳΔ
ಛఆͷI/O͡Όͳ͍ͱޮ͔ͳ͍ཧ༝
σΟεΫΩϟογϡͷޮ͍ͨREAD ϓϩηεۭؒ σΟεΫΩϟογϡ ཧσόΠε σΟεΫΩϟογϡͷ σʔλΛฦ͢
σΟεΫΩϟογϡͷͳ͍READ ϓϩηεۭؒ σΟεΫΩϟογϡ ཧσόΠε
σΟεΫΩϟογϡͷͳ͍READ ϓϩηεۭؒ σΟεΫΩϟογϡ ཧσόΠε σΟεΫΩϟογϡ࡞ σΟεΫΩϟογϡͷ σʔλΛฦ͢
ී௨ͷWRITEʢԆ WRITEʣ ϓϩηεۭؒ σΟεΫΩϟογϡ ཧσόΠε ޙͰॻ͖ࠐΈ σΟεΫΩϟογϡʹ ίϐʔΛͯ͠ऴྃ
ී௨ͷWRITEʢԆ WRITEʣ ϓϩηεۭؒ σΟεΫΩϟογϡ ཧσόΠε ޙͰॻ͖ࠐΈ σΟεΫΩϟογϡʹ ίϐʔΛͯ͠ऴྃ ୭͕Δͷʁ
ఆظతʹLINUX Χʔωϧ͕ॻ͖ࠐΜͰ·͢ɻ ※͔ͩΒ IONICE ͕ޮ͔ͳ͍
ఆظతͳಉظॲཧ
ಛघͳϑϥάͷཱͬͨI/O ϓϩηεۭؒ σΟεΫΩϟογϡ ཧσόΠε ΩϟογϡΛܦ༝ͤͣ σόΠεʹಡΈॻ͖͢Δ
࣭ίʔφʔ