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Optimizing Directory-Based Cache Coherence Protocols in Interconnected CPU Networks

zev avatar
zev
26 diapositives · 451 Views · Jul 16, 2014

This document discusses the intricacies of directory-based protocols for managing cache coherence in interconnected CPU networks, specifically focusing on memory hierarchies such as caches and directories. It analyzes read and write misses across different CPUs, how read and write requests are handled, and the implications of cache memory performance. Additionally, it explores strategies for invalidation and data consistency among caches, crucial for optimizing multi-core processor design and performance efficiency.

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Optimizing Directory-Based Cache Coherence Protocols in Interconnected CPU Networks
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  1. Interconnection Network Directory Directory Directory Local Memory Local Memory Local Memory Cache Cache Cache CPU 0 CPU 1 CPU 2 Directory-based Protocol

  2. CPU 0 CPU 1 CPU 2 Directory-based Protocol Interconnection Network Bit Vector X U 0 0 0 Directories X 7 Memories Caches

  3. Read Miss CPU 0 CPU 1 CPU 2 CPU 0 Reads X Interconnection Network X U 0 0 0 Directories X 7 Memories Caches

  4. CPU 0 CPU 1 CPU 2 CPU 0 Reads X Interconnection Network X S 1 0 0 Directories X 7 Memories Caches

  5. X X 7 7 CPU 0 CPU 1 CPU 2 CPU 0 Reads X Interconnection Network X S 1 0 0 Directories Memories Caches

  6. X X 7 7 Read Miss CPU 0 CPU 1 CPU 2 CPU 2 Reads X Interconnection Network X S 1 0 0 Directories Memories Caches

  7. X X 7 7 CPU 0 CPU 1 CPU 2 CPU 2 Reads X Interconnection Network X S 1 0 1 Directories Memories Caches

  8. X X X 7 7 7 CPU 0 CPU 1 CPU 2 CPU 2 Reads X Interconnection Network X S 1 0 1 Directories Memories Caches

  9. X X X 7 7 7 CPU 1 CPU 2 CPU 0 CPU 0 Writes 6 to X Interconnection Network Write Miss X S 1 0 1 Directories Memories Caches

  10. X X X 7 7 7 CPU 1 CPU 2 CPU 0 CPU 0 Writes 6 to X Interconnection Network X S 1 0 1 Directories Invalidate Memories Caches

  11. X 7 CPU 0 CPU 1 CPU 2 CPU 0 Writes 6 to X Interconnection Network X E 1 0 0 Directories Memories Caches X 6

  12. X X 7 6 CPU 0 CPU 1 CPU 2 CPU 1 Reads X Interconnection Network Read Miss X E 1 0 0 Directories Memories Caches

  13. X X 7 6 CPU 0 CPU 1 CPU 2 CPU 1 Reads X Interconnection Network Switch to Shared X E 1 0 0 Directories Memories Caches

  14. X X 6 6 CPU 0 CPU 1 CPU 2 CPU 1 Reads X Interconnection Network X E 1 0 0 Directories Memories Caches

  15. X X X 6 6 6 CPU 0 CPU 1 CPU 2 CPU 1 Reads X Interconnection Network X S 1 1 0 Directories Memories Caches

  16. X X X 6 6 6 CPU 1 CPU 2 CPU 0 CPU 2 Writes 5 to X Interconnection Network X S 1 1 0 Directories Memories Write Miss Caches

  17. X X X 6 6 6 CPU 1 CPU 2 CPU 0 CPU 2 Writes 5 to X Interconnection Network Invalidate X S 1 1 0 Directories Memories Caches

  18. X 6 CPU 0 CPU 1 CPU 2 CPU 2 Writes 5 to X Interconnection Network X E 0 0 1 Directories Memories X 5 Caches

  19. Write Miss X X 6 5 CPU 0 CPU 1 CPU 2 CPU 0 Writes 4 to X Interconnection Network X E 0 0 1 Directories Memories Caches

  20. X X 6 5 CPU 0 CPU 1 CPU 2 CPU 0 Writes 4 to X Interconnection Network X E 1 0 0 Directories Memories Take Away Caches

  21. X X 5 5 CPU 0 CPU 1 CPU 2 CPU 0 Writes 4 to X Interconnection Network X E 0 1 0 Directories Memories Caches

  22. X 5 CPU 0 CPU 1 CPU 2 CPU 0 Writes 4 to X Interconnection Network X E 1 0 0 Directories Memories Caches

  23. X X 5 5 CPU 0 CPU 1 CPU 2 CPU 0 Writes 4 to X Interconnection Network X E 1 0 0 Directories Memories Caches

  24. X 5 CPU 0 CPU 1 CPU 2 CPU 0 Writes 4 to X Interconnection Network X E 1 0 0 Directories Memories Caches X 4

  25. X X X 5 4 4 CPU 1 CPU 2 CPU 0 CPU 0 Writes Back X Block Interconnection Network Data Write Back X E 1 0 0 Directories Memories Caches

  26. X 4 CPU 0 CPU 1 CPU 2 CPU 0 Writes Back X Block Interconnection Network X U 0 0 0 Directories Memories Caches