PPT-Cache

Here we focus on cache improvements to support at least 1 instruction fetch and at least 1 data access per cycle With a superscalar we might need to accommodate more than 1 per cycle Typical server and . 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 Marc De Melo. Outline. Non-Uniform Cache Architecture (NUCA). Cache Coherence. Implementation of directories in multicore architecture. 2. Non-Uniform Cache Architecture [1]. Uniform Cache Architecture. George Kurian. 1. , Omer Khan. 2. , . Srini. . Devadas. 1. 1 . Massachusetts Institute of Technology. 2 . University of Connecticut, Storrs. 1. Cache Hierarchy Organization. Directory-Based Coherence. for 3D memory systems. CAMEO. 12/15/2014 MICRO. Cambridge, UK. Chiachen Chou, Georgia Tech. Aamer. . Jaleel. , Intel. Moinuddin. K. . Qureshi. , Georgia Tech. Executive Summary. How to use . S. tacked DRAM: Cache or Memory. Hardware Accelerators. Yakun. Sophia Shao, Sam Xi,. Viji. . Srinivasan. , . Gu-Yeon. Wei, David Brooks. More accelerators.. Out-of-Core. Accelerators. Maltiel. Consulting . estimates. 2. [Die photo from . CS448. 2. What is Cache Coherence?. Two processors can have two different values for the same memory location. Write Through Cache. 3. Terminology. Coherence. Defines what values can be returned by a read. with Inclusive Caches . Temporal Locality Aware (TLA) Cache Management Policies. Aamer Jaleel, Eric Borch, Malini Bhandaru,. Simon Steely Jr., Joel Emer. In International Symposium on Microarchitecture (MICRO). Varun. . Mathur. Mingwei. Liu. 1. I-cache and address tag . Instruction cache has. Large chip area. High access frequency=>switching power. Example:. Direct mapped I-cache. 1024 entries (=>1024 one way sets). Jan Reineke. j. oint work with Andreas Abel. . . Uppsala University. December 20, 2012 . The Timing Analysis Problem. Embedded Software. Timing Requirements. ?. Microarchitecture. +. What does the execution time of a program depend on?. using Per-Instruction Working Blocks. Jason Jong Kyu Park. 1. , . Yongjun. Park. 2. , and . Scott . Mahlke. 1. 1. 1. University . of . Michigan, . Ann . Arbor. 2. Hongik University. Inter-thread Interference. Matthew D. . Sinclair et. al. UIUC. Presenting by. Sharmila. . Shridhar. SoCs. Need an . Efficient Memory Hierarchy. 2. Energy-efficient memory hierarchy is . essential. Heterogeneous . SoCs. use . 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. Yuval Yarom. The University of Adelaide and Data61. “The . binary search needs to be done in constant time to avoid timing issue. But it's fast, so there's no problem. .” . An anonymous reviewer, .