PDF-The Cache Coherency Challenge

Today146s most popular mobile devices rely on multiple processors such as the ARM Cortex 153 A15 to satisfy consumer demand for high performance and respon siveness But a softwarebased. 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 1 1 CS448 2 What is Cache Coherence? • Two processors can have two different values for the same memory location Write Through Cache 2 3 Terminology • Coherence – Defines what va  Stefan . Schackow. Program Manager. Microsoft Corporation. PC41. What's the current state?. Why is it changing?. How are we changing it?. .NET Framework Caching. A great in-memory object cache in ASP.NET. Andrew Putnam, Susan Eggers. Dave Bennett, Eric Dellinger, Jeff Mason, . Henry Styles, . Prasanna. . Sundararajan. , Ralph Wittig. University of . Washington. -- CSE. Xilinx Research Labs. High-Performance Computing. S. Narravula, P. Balaji, K. Vaidyanathan, . S. Krishnamoorthy, J. Wu and D. K. Panda. The Ohio State University. Presentation Outline. Introduction/Motivation. Design and Implementation. Experimental Results. Hakim Weatherspoon. CS 3410, Spring 2013. Computer Science. Cornell University. P&H Chapter . 2.11 and 5.8. Big Picture: Parallelism and Synchronization. How do I take advantage of multiple processors; . 1. Øyvind Andreassen. 2,3. Helwig Hauser. 1. Integrated Multi-aspect Visualization of 3D Fluid Flows. 1. University of Bergen, Norway. 2. . Norwegian Defence Research Establishment, Norway. 3. University Graduate Center at Kjeller, Norway. UC Berkeley Seismological Laboratory. Towards Optimal Design of Seismic Array For Earthquake Source Imaging . Pablo . Ampuero. Caltech . Seismo. Lab. Yellow Knife Array. (. Rost. & Thomas ,2002). 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. In-DRAM Address Translation to Improve the Spatial Locality of Non-unit Strided Accesses. Vivek Seshadri. Thomas Mullins, . Amirali. . Boroumand. , Onur Mutlu, . Phillip B. . Gibbons, Michael A. Kozuch, . Hakim Weatherspoon. CS 3410, Spring 2013. Computer Science. Cornell University. P&H Chapter 2.11 and 5.8. Big Picture: Parallelism and Synchronization. How do I take advantage of multiple processors; . With a superscalar, we might need to accommodate more than 1 per cycle. Typical server and . m. obile device. memory hierarchy. c. onfiguration with. b. asic sizes and. access times. PCs and laptops will. Direct-mapped caches. Set-associative caches. Impact of caches on performance. CS 105. Tour of the Black Holes of Computing. Cache Memories. C. ache memories . are small, fast SRAM-based memories managed automatically in hardware.