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. Distributed Shared Memory

4. Messages among processors and directories

5. Example of a Directory Protocol

6. Example of a Directory Protocol

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