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Papers We Love: ARC after dark

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My Papers We Love talk in San Francisco on October 12, 2017 on "ARC: A self-tuning, low overhead replacement cache." Video at https://www.youtube.com/watch?v=F8sZRBdmqc0

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Papers We Love: ARC after dark

  1. 1. Papers We Love: ARC after dark CTO bryan@joyent.com Bryan Cantrill @bcantrill
  2. 2. Papers we love: ARC • Discussing ARC: A self-tuning, low overhead replacement cache by Nimrod Megiddo and Dharmendra Modha • Appeared in USENIX FAST ’03 • Has been broadly deployed in production — most notably in ZFS, in at least illumos (SmartOS, etc.) and FreeBSD • As much as possible, want to let the paper speak for itself — and provoke discussion!
  3. 3. ARC in the abstract
  4. 4. Introduction
  5. 5. Book of Genesis, 1:1
  6. 6. The Von Neumann architecture
  7. 7. “The Memory Organ”
  8. 8. “Entirely impractical”
  9. 9. The problem
  10. 10. Main themes
  11. 11. Related work: Optimal
  12. 12. Related work: Using recency with LRU
  13. 13. Related work: Using frequency with LFU
  14. 14. Related work: LRU-2
  15. 15. Related work: LRFU
  16. 16. Related work: ALRFU (AYFKM?!)
  17. 17. Related work: MQ
  18. 18. Related work: MQ, cont.
  19. 19. Related work: “Multiple experts”
  20. 20. Related work: Ghost caches
  21. 21. Generic cache replacement policy (?)
  22. 22. Fixed replacement cache
  23. 23. Adaptive replacement cache
  24. 24. Adaptive replacement cache
  25. 25. Adaptive replacement cache
  26. 26. Adaptive replacement cache
  27. 27. Adaptive replacement cache
  28. 28. Adaptive replacement cache
  29. 29. Adaptive replacement cache
  30. 30. ARC performance
  31. 31. ARC performance
  32. 32. ARC performance
  33. 33. ARC performance vs. LRU
  34. 34. ARC performance vs. FRC offline
  35. 35. ARC performance: “Empirically universal”
  36. 36. ARC performance: p over time
  37. 37. ARC: Conclusions
  38. 38. ARC: Endnotes
  39. 39. ARC: Endnotes
  40. 40. ARC: Epilogue • The ARC is the basis of the cache used by ZFS, with many enhancements over time: • Variable sized buffers — though now returning to be fixed blocks with ARC buffer data (ABD) • L2ARC to allow SSDs to be used as a cache • Separate metadata lists • Compressed ARC • A challenge has been to make all of ARC variable-sized…
  41. 41. Peril of a variably-sized ARC!

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