PPT-Directory-Based Cache Coherence

Marc De Melo Outline NonUniform Cache Architecture NUCA Cache Coherence Implementation of directories in multicore architecture 2 NonUniform Cache Architecture 1 Uniform Cache Architecture. Message Passing Sharedmemory single copy of shared data in memory threads communicate by readingwriting to a shared location Messagepassing each thread has a copy of data in its own private memory that other threads cannot access threads communicate Autumn 2006 CSE P548 Cache Coherence 6 A Lowend MP brPage 4br Autumn 2006 CSE P548 Cache Coherence 7 Cache Coherency Prot ocol Implementations Snooping used with lowend MPs few processors centralized memory busbased distributed implementation Tomas . Mancal. Charles University in Prague. QuEBS. 09. 8.7.2009 Lisbon. Collaborators. : . Jan . Ol. šina, . Vytautas. . Balevičius. . and. . Leonas. . Valkunas. System of Interest: Photosynthetic Aggregates of Chlorophylls. f. or . Integrated CPU-GPU Systems. Jason Power*. , Arkaprava Basu*, . Junli. . Gu. †. , Sooraj Puthoor. †. ,. Bradford M Beckmann. †. , Mark D Hill*. †. , Steven K Reinhardt. †. , David A Wood*. †. : Rethinking Hardware for Disciplined Parallelism. Byn Choi, Rakesh Komuravelli, Hyojin Sung, . Rob Bocchino, Sarita Adve, Vikram Adve. Other collaborators:. Languages: Adam Welc, Tatiana Shpeisman, Yang Ni (Intel). Coherence . Directories. Michael . C. . Huang. Guofan. Jiang. Zhejiang University. University . of . Rochester. IBM. 1. Lei Fang. , . Peng. Liu, and Qi Hu. Motivation. 2. Technology scaling has steadily increased the number . Smruti R. Sarangi, IIT Delhi. Contents. Overview of the Directory Protocol. Details. Optimizations. Basic Idea of a Coherence Protocol. Memory Level . n. Memory Level . n+2. Private Cache. Private Cache. Systems. Distributed Shared Memory. Prof. Chung-Ta King. Department of Computer Science. National Tsing Hua University, Taiwan. (Slides are from textbook, . Prof. . O. . Mutlu. , Prof. . Hsien-Hsin. Lee. Content Guide, pp. . 68-72. Personal routine . EL. EO/P. . . Not . (yet) evident . . . Emerging Developing. . Controlled. Emerging Coherence and Cohesion (EL):. Because his teeth need to be clean. . :. What is Cache Coherence?. When one Core writes to its own cache the other core gets to see it, when they read it out of its own cache.. Provides underlying guarantees for the programmer with respect to data validation.. wrt. . . Trace Filters. Parosh. . Aziz Abdulla. 1. , . Mohamed . Faouzi. Atig. 1. , . Zeinab. Ganjei. 2. , Ahmed Rezine. 2. . and . Yunyun. . Zhu. 1. 1. Uppsala. . University, Sweden. 2. . Lin. 1. ACROSS GRADE COHERENCE IN GRADES 3–5. Welcome Back!. 2. ACROSS GRADE COHERENCE IN GRADES 3–5. Thank You for Your Feedback!. +.  . 3. Take responsibility for yourself as a learner.. Honor timeframes (start, end, and activity).. sharedmemory architectures Adapted from a lecture by Ian Watson, University of Machester Overview We have talked about optimizing performance on single coresLocalityVectorizationNow let us look at opt Lecture 20. April . 9. th. , . 2012. Distributed Shared Memory. Prof John D. Kubiatowicz. http://www.cs.berkeley.edu/~kubitron/cs252. LD. 1. A .  5. LD. 2. B  7. LD. 5. B .  2. ST. 1. A,6.