Linux Process Snapper Introduction
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Linux Process Snapper の紹介
Linux Process Snapper Introduction
- 1. Linux Process Snapper の紹介 Dec, 2020 Twitter: yoheia@
- 2. Linux Process Snapper の作者 https://speakerdeck.com/tanelpoder/troubleshooting-linux-activity-with-task-state-sampling?slide=2
- 3. Tanel Poder db tech showcase で何度か来日したことも
- 4. Linux Process Snapper のコンセプト https://speakerdeck.com/tanelpoder/troubleshooting-linux-activity-with-task-state-sampling?slide=4
- 5. pSnapper は Python スクリプト https://speakerdeck.com/tanelpoder/troubleshooting-linux-activity-with-task-state-sampling?slide=14
- 6. pSnapper は 0x.tools のツール群の一つ https://0x.tools/
- 7. pSnapper は Thread State Analysis Snapper pSnapper Performance Insights Oracle ASH など https://speakerdeck.com/tanelpoder/troubleshooting-linux-activity-with-task-state-sampling?slide=5
- 9. Thread State Analysis に使うツール https://speakerdeck.com/tanelpoder/troubleshooting-linux-activity-with-task-state-sampling?slide=6
- 10. B.Gregg の Thread State Analysis Method http://www.brendangregg.com/tsamethod.html Brendan Gregg • Netflix の Sr. Performance Architect • Sun->Oracle->Joyent->Netflix
- 11. Performance Insights は TSA の発展型の ASH https://www.slideshare.net/yoheiazekatsu/awrexcel/8 https://docs.aws.amazon.com/ja_jp/AmazonRDS/latest/UserGuide/USER_PerfInsights.UsingDashboard.html Kyle Hailey Oracle、AWS や他にも様々なプロダクトで ASH のコンセプトを実装 スレッド（セッション）の状態をサンプリングし、 その履歴を可視化。スレッドの状態より細やかに Wait Event ベースで状態をサンプリング。 *ASH: Active Session History
- 12. ps で Thread State Analysis してみる https://speakerdeck.com/tanelpoder/troubleshooting-linux-activity-with-task-state-sampling?slide=9
- 15. デモ # pgbench で PostgeSQL にクエリ実行 $ pgbench -r -c 8 -j 8 -t 100000 -U postgres -h localhost -d postgres -p 5432 > /dev/null 2>&1 & # pSnapper でサンプリングする $ sudo psn -G syscall,wchan
- 16. 実行例 # dd を実行 $ sudo sh -c "echo 3 > /proc/sys/vm/drop_caches" $ sudo dd if=/dev/xvda1 of=/dev/null bs=1M count=10000 & # pSnapper でサンプリングする $ sudo psn -G syscall,wchan,kstack
- 17. まとめ
- 18. まとめ • Linux Process Snapper はアドホックなトラブルシューティングツール • Python スクリプトおくだけで動く • Thread State Analysis （サンプリング&集計）ができる • 情報ソースは /proc • 機能追加される計画なので、今後も期待
- 19. Appendix. 参考情報 • Linux Performance Analysis in 15 minutes https://www.slideshare.net/yoheiazekatsu/linux-performance-analysis-in-15-minutes • Modern Linux Performance Tools for Application Troubleshooting • https://www.slideshare.net/tanelp/modern-linux-performance-tools-for-application-troubleshooting • Profiling Linux Activity for Performance and Troubleshooting https://www.youtube.com/watch?v=YEWp3O7Kem8 • 0x.tools https://0x.tools/ • tanelpoder - 0xtools (Github) https://github.com/tanelpoder/0xtools