Download or read book The Cache Group Scheme for Hardware controlled Cache Coherence and the General Need for Hardware Coherence Control in Large scale Multiprocessors written by Joseph Edward Hoag and published by . This book was released on 1991 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 910 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hardware and Compiler directed Cache Coherence in Large scale Multiprocessors written by Lynn Choi and published by . This book was released on 1996 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "In this paper, we study a hardware-supported, compiler-directed (HSCD) cache coherence scheme, which can be implemented on a large-scale multiprocessor using off-the-shelf microprocessors, such as the Cray T3D. The scheme can be adapted to various cache organizations, including multi-word cache lines and byte-addressable architectures. Several system related issues, including critical sections, inter-thread communication, and task migration have also been addressed. The cost of the required hardware support is minimal and proportional to the cache size. The necessary compiler algorithms, including intra- and interprocedural array data flow analysis, have been implemented on the Polaris parallelizing compiler [33]. From our simulation study using the Perfect Club benchmarks [5], we found that in spite of the conservative analysis made by the compiler, the performance of the proposed HSCD scheme can be comparable to that of a full-map hardware directory scheme. Given its comparable performance and reduced hardware cost, the proposed scheme can be a viable alternative for large-scale multiprocessors such as the Cray T3D, which rely on users to maintain data coherence."

Download or read book Hardware and Compiler Support for Cache Coherence in Large scale Shared memory Multiprocessors written by Lynn Choi and published by . This book was released on 1996 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hardware and Compiler directed Cache Coherence in Large scale Multiprocessors Design Considerations and Preformance Study written by L. Choi and published by . This book was released on 1996 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1 957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna tional publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 36 (thesis year 1991) a total of 11,024 thesis titles from 23 Canadian and 161 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work. While Volume 36 reports theses submitted in 1991, on occasion, certain univer sities do report theses submitted in previous years but not reported at the time.

Download or read book Proceedings of the 1993 International Conference on Parallel Processing written by Alok N. Choudhary and published by CRC Press. This book was released on 1993-08-16 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: This three-volume work presents a compendium of current and seminal papers on parallel/distributed processing offered at the 22nd International Conference on Parallel Processing, held August 16-20, 1993 in Chicago, Illinois. Topics include processor architectures; mapping algorithms to parallel systems, performance evaluations; fault diagnosis, recovery, and tolerance; cube networks; portable software; synchronization; compilers; hypercube computing; and image processing and graphics. Computer professionals in parallel processing, distributed systems, and software engineering will find this book essential to their complete computer reference library.

Download or read book Cache and Interconnect Architectures in Multiprocessors written by Michel Dubois and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cache And Interconnect Architectures In Multiprocessors Eilat, Israel May 25-261989 Michel Dubois UniversityofSouthernCalifornia Shreekant S. Thakkar SequentComputerSystems The aim of the workshop was to bring together researchers working on cache coherence protocols for shared-memory multiprocessors with various interconnect architectures. Shared-memory multiprocessors have become viable systems for many applications. Bus based shared-memory systems (Eg. Sequent's Symmetry, Encore's Multimax) are currently limited to 32 processors. The fIrst goal of the workshop was to learn about the performance ofapplications on current cache-based systems. The second goal was to learn about new network architectures and protocols for future scalable systems. These protocols and interconnects would allow shared-memory architectures to scale beyond current imitations. The workshop had 20 speakers who talked about their current research. The discussions were lively and cordial enough to keep the participants away from the wonderful sand and sun for two days. The participants got to know each other well and were able to share their thoughts in an informal manner. The workshop was organized into several sessions. The summary of each session is described below. This book presents revisions of some of the papers presented at the workshop.

Download or read book The Cache Coherence Problem in Shared Memory Multiprocessors written by Igor Tartalja and published by Wiley-IEEE Computer Society Press. This book was released on 1996-02-13 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book illustrates state-of-the-art software solutions for cache coherence maintenance in shared-memory multiprocessors. It begins with a brief overview of the cache coherence problem and introduces software solutions to the problem. The text defines and details static and dynamic software schemes, techniques for modeling performance evaluation mechanisms, and performance evaluation studies.

Download or read book Cache Coherence Protocols for Large scale Multiprocessors written by D. L. Chaiken and published by . This book was released on 1990 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Energy Research Abstracts written by and published by . This book was released on 1992 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Software Cache Coherence for Large Scale Multiprocessors written by University of Rochester. Department of Computer Science and published by . This book was released on 1994 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "Shared memory provides an attractive and intuitive programming model that makes good use of programmer time and effort. Shared memory however requires a coherence mechanism to allow caching for performance and to ensure that processors do not use stale data in their caches. We evaluate several algorithmic and architectural alternatives in the design space of NCC-NUMA machines with a globally-accessible physical address space. We present a new adaptive algorithm for software cache coherence that reduces interprocessor communication and scales to large numbers of processors; we compare it to existing software and hardware coherence schemes. We also evaluate (1) the tradeoffs among various write policies (write-through, write-back, write-through with a write-collect buffer) and (2) the effect on performance of using remote memory access. Finally, we observe that certain simple program changes can greatly improve performance. For example, we find that the use of reader-writer locks, synchronization variable relocation, and data structure padding and alignment can allow a protocol to avoid significant amounts of coherence overhead."

Download or read book Software Cache Coherence for Large Scale Multiprocessors written by University of Rochester. Dept. of Computer Science and published by . This book was released on 1994 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "Shared memory provides an attractive and intuitive programming model that makes good use of programmer time and effort. Shared memory however requires a coherence mechanism to allow caching for performance and to ensure that processors do not use stale data in their caches. We evaluate several algorithmic and architectural alternatives in the design space of NCC-NUMA machines with a globally-accessible physical address space. We present a new adaptive algorithm for software cache coherence that reduces interprocessor communication and scales to large numbers of processors; we compare it to existing software and hardware coherence schemes. We also evaluate (1) the tradeoffs among various write policies (write-through, write-back, write-through with a write-collect buffer) and (2) the effect on performance of using remote memory access. Finally, we observe that certain simple program changes can greatly improve performance. For example, we find that the use of reader-writer locks, synchronization variable relocation, and data structure padding and alignment can allow a protocol to avoid significant amounts of coherence overhead."

Download or read book Combining Hardware and Software Cache Coherence Strategies written by David J. Lilja and published by . This book was released on 1991 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "Efficiently maintaining cache coherence is a major problem in large-scale shared memory multiprocessors. Hardware directory schemes have very high memory requirements, while software-directed schemes must rely on imprecise compile-time memory disambiguation. Recently proposed dynamic directory schemes allocate pointers to blocks only as they are referenced, which significantly reduces their memory requirements, but they still allocate pointers to blocks that do not need them. We show how compiler marking can further reduce the directory size by allocating pointers only when necessary. Using trace-driven simulations, we find that the performance of this new approach is comparable to other coherence schemes, but with significantly lower memory requirements."

Download or read book A Primer on Memory Consistency and Cache Coherence written by Daniel Sorin and published by Morgan & Claypool Publishers. This book was released on 2011-03-02 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many modern computer systems and most multicore chips (chip multiprocessors) support shared memory in hardware. In a shared memory system, each of the processor cores may read and write to a single shared address space. For a shared memory machine, the memory consistency model defines the architecturally visible behavior of its memory system. Consistency definitions provide rules about loads and stores (or memory reads and writes) and how they act upon memory. As part of supporting a memory consistency model, many machines also provide cache coherence protocols that ensure that multiple cached copies of data are kept up-to-date. The goal of this primer is to provide readers with a basic understanding of consistency and coherence. This understanding includes both the issues that must be solved as well as a variety of solutions. We present both highlevel concepts as well as specific, concrete examples from real-world systems. Table of Contents: Preface / Introduction to Consistency and Coherence / Coherence Basics / Memory Consistency Motivation and Sequential Consistency / Total Store Order and the x86 Memory Model / Relaxed Memory Consistency / Coherence Protocols / Snooping Coherence Protocols / Directory Coherence Protocols / Advanced Topics in Coherence / Author Biographies

Download or read book Visible Synchronization Based Cache Coherence written by Krishna Kumar and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In large scale machines, thousands of processor cycles, in other words, missed opportunities to issue floating point instructions, may be lost while waiting for a high latency synchronization or memory operation to complete, or a stall in an instruction pipeline to be dealt with. Latency is avoided by bringing data to a nearby locale for future reference (e.g., caching) while latency is tolerated by overlapping data movement with something useful. The issue of cache coherence arises whenever there are multiple copies of a shared datum in different caches of a shared-memory multiprocessor system. It is in order to maintain consistency between these multiple copies that cache coherence protocols are employed. The efficiency of latency avoidance methods is largely dependent upon the minimization of coherence traffic in the coherence protocol used to maintain cache coherency. Cache coherence protocols in general can be divided into two classes: hardware implemented ones and compiler implemented ones. Hardware implemented ones lead to large coherence traffic, and large state storage space. Conventional compiler implemented ones involve indiscriminate wasteful invalidation. There is also redundancy between synchronization operations and coherence operations. We seek to eliminate both weaknesses, by letting visible synchronization directly coordinate changes in the writability of shared data. We propose to add scalable compiler managed caches to a TERA-like multithreaded multiprocessor architecture, with user/compiler knowledge (i.e., alias analysis, dependence analysis and user directives) used to eliminate essentially all coherence traffic. To preserve scalability, we aim to use latency tolerance methods like switch-on-every-cycle multithreading, and augment this with simple, low-latency cache coherence protocols such as our visible synchronization based one.

Download or read book Masters Theses in the Pure and Applied Sciences written by W. H. Shafer and published by Springer Science & Business Media. This book was released on 1993 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 36 reports (for thesis year 1991) a total of 11,024 thesis titles from 23 Canadian and 161 US universities. The organization of the volume, as in past years, consists of thesis titles arranged by discipline, and by university within each discipline. The titles are contributed by any and all a