Computer Architecture: A quantitative approach - Cap4 - Section 4

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Computer Architecture: A quantitative approach - Cap4 - Section 4

  1. 1. Multiprocessors and Thread-Level Parallelism Distributed Shared Memory and Directory-Based Coherence “ A directory protocol also can be used to reduce the bandwidth demands in a centralized shared-memory machine, as the Sun T1 design does.” Hennessy and Patterson
  2. 2. Distributed Shared Memory
  3. 3. <ul><li>Cache block states: </li></ul><ul><li>Shared: block cached, value up to date </li></ul><ul><li>Uncached: No processor has a copy </li></ul><ul><li>Modified: Has an owner, memory out of date </li></ul>Directory-Based Coherence: The Basics
  4. 4. Messages among processors and directories
  5. 5. Example of a Directory Protocol
  6. 6. Example of a Directory Protocol
  7. 7. Thank you! Author: Prof. Sergio Takeo, Marcelo Arbore. Bibliography: Patterson, D. A.; Hennessy, J. L. Computer Architecture: A quantitative Approach, 4 th Ed. Morgan Kaufmann Publishers. “ A directory protocol also can be used to reduce the bandwidth demands in a centralized shared-memory machine, as the Sun T1 design does.” Hennessy and Patterson

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