PPT-1 Multiprocessor Cache Coherency

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. Client sends HTTP request 2 Web Cache responds immediately if cached object is available 3 If object is not in cache W eb Cache requests object from Application Server 4 Application Server generates response may include Database queries 5 Applicatio coprocessor 8087 2 closely coupled 8089 3 loosely coupled Multibus Coprocessors and closely coupled configurations are similar in that both the CPU and the external processor share Memory IO system Bus bus control logic Clock generator Closely 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. 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). Multiprocessor Page 1 Snoop-Based Multiprocessor Design I: Base DesignTodd C. Mowry CS 418 CS 418 Feb. 23 & 24, 2011 Design Goalscostdepend on CorrectnessHigh PerformanceOften at oddsHigh Performance = multiple ou Companion slides for. The Art of Multiprocessor Programming. by Maurice . Herlihy. & . Nir. . Shavit. TexPoint fonts used in EMF. . Read the TexPoint manual before you delete this box.: . A. A. The Art of Multiprocessor Programming. by Maurice Herlihy & Nir Shavit. Art of Multiprocessor Programming. 2. Review: . Amdahl. '. s . Law. Speedup =. Shared Data Structures. 75%. Unshared. 25%. Shared. The Art of Multiprocessor Programming. by Maurice Herlihy & Nir Shavit. Art of Multiprocessor Programming. 2. Simple Video Game. Prepare frame for display. By graphics coprocessor. “soft real-time” application. Companion slides for. The Art of Multiprocessor Programming. by Maurice Herlihy & Nir Shavit. Art of Multiprocessor Programming. 2. A Shared Pool. Put. Insert item. block if full. Remove. Remove & return item. 2. Mutual Exclusion. We will clarify our understanding of mutual exclusion. We will also show you how to reason about various properties in an asynchronous concurrent setting. Art of Multiprocessor Programming. Companion slides for. The Art of Multiprocessor Programming. by Maurice . Herlihy. & . Nir. . Shavit. Turing Computability. A mathematical model of computation. Computable = Computable on a T-Machine. 1. Chapter 10. Multiprocessor and. Real-Time Scheduling. BYU CS 345. Chapter 10 - Multiprocessor and Read-Time Scheduling. 2. Classifications of Multiprocessors. Loosely coupled multiprocessor.. each processor has its own memory and I/O channels. 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.