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Papers We Love:
ARC after dark
CTO
bryan@joyent.com
Bryan Cantrill
@bcantrill
Papers we love: ARC
• Discussing ARC: A self-tuning, low overhead replacement
cache by Nimrod Megiddo and Dharmendra Modha...
ARC in the abstract
Introduction
Book of Genesis, 1:1
The Von Neumann architecture
“The Memory Organ”
“Entirely impractical”
The problem
Main themes
Related work: Optimal
Related work: Using recency with LRU
Related work: Using frequency with LFU
Related work: LRU-2
Related work: LRFU
Related work: ALRFU (AYFKM?!)
Related work: MQ
Related work: MQ, cont.
Related work: “Multiple experts”
Related work: Ghost caches
Generic cache replacement policy (?)
Fixed replacement cache
Adaptive replacement cache
Adaptive replacement cache
Adaptive replacement cache
Adaptive replacement cache
Adaptive replacement cache
Adaptive replacement cache
Adaptive replacement cache
ARC performance
ARC performance
ARC performance
ARC performance vs. LRU
ARC performance vs. FRC offline
ARC performance: “Empirically universal”
ARC performance: p over time
ARC: Conclusions
ARC: Endnotes
ARC: Endnotes
ARC: Epilogue
• The ARC is the basis of the cache used by ZFS, with many
enhancements over time:
• Variable sized buffers ...
Peril of a variably-sized ARC!
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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

Published in: Software
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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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