Download or read book The Implementation of a Coherent Memory Abstraction on a NUMA Non Uniform Memory Access Multiprocessor Experiences with PLATINUM Platform for Investigating Non Uniform Memory Revision written by and published by . This book was released on 1989 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: PLATINUM is an operating system kernel with a novel memory management system for Non-uniform Memory Access (NUMA) multiprocessor architectures. This memory management system implements a coherent memory abstraction. Coherent memory is uniformly accessible from all processors in the system. When used by applications coded with appropriate programming styles it appears to be nearly as fast as local physical memory and it reduces memory contention. Coherent memory makes programming NUMA multiprocessors easier for the user while attaining a level of performance comparable with hand-tuned programs. This paper describes the design of the PLATINUM memory management system with emphasis on the implementation of coherent memory and the factors that affect its performance. We measure the cost of basic operations implementing coherent memory. We also measure the performance of a set of application programs running on PLATINUM. Finally, we comment on the interaction between architecture and the coherent memory system. Platinum currently runs on the BBN Butterfly Plys (TM) Multiprocessor. (KR).
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1990 with total page 740 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical Reports Awareness Circular TRAC written by and published by . This book was released on 1989-12 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA SP 7500 written by United States. National Aeronautics and Space Administration and published by . This book was released on with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Management written by and published by . This book was released on 1991 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Management a Bibliography for NASA Managers written by and published by . This book was released on 1991 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The implementation of a coherent memory abstraction on a NUMA multiprocessor written by University of Rochester. Department of Computer Science and published by . This book was released on 1989 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1990-02 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The implemenation of a coherant memory abstraction on a NUMA multiprocessor written by Alan L. Cox and published by . This book was released on 1989 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: We measure the cost of basic operations implementing the coherent memory. We also measure the performance of a set of application programs running on PLATINUM. Finally, we comment on the interaction between architecture and the coherent memory system. PLATINUM currently runs on the BBN Butterfly Plus[trademark] Multiprocessor."
Download or read book Government Reports Annual Index written by and published by . This book was released on 1990 with total page 1312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Implementation and Evaluation of a Coherent Memory Abstraction for NUMA Multiprocessors written by Alan Lee Cox and published by . This book was released on 1992 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An overview of PLATINUM written by R. J. Fowler and published by . This book was released on 1988 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Overview of PLATINUM written by Robert J. Fowler and published by . This book was released on 1988 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Extending the Real Time Specification for Java for Cache Coherent NUMA Architectures written by Haseeb Malik and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The recent past has seen single processing systems becoming obsolete and multiprocessor systems taking over as the architecture of choice. More scalable architectures are being introduced to keep up with the ever increasing computational requirements. Inevitably the software industry has to keep up and provide tools which would allow easy development of parallel applications on these complex architectures. Programming languages unable to support these architectures will become obsolete and new languages will be developed designed to serve the purpose. Existing languages that have the potential of coping with such architectures will be extended. Java is an object oriented language which provides features like platform independence and concurrency by design. It is supported on a wide range of computational devices starting from high performance computing servers to small hand held mobiles. This makes Java a very popular language, with a large pool of programmers. Therefore, it is not strange to see Java being extended for different multiprocessor and distributed systems. The Real-Time Specification for Java (RTSJ) was introduced as a high level platform for developing real-time applications. It has been gaining popularity since its inception and is being increasingly used for real time development. The recent version of RTSJ (i.e. RTSJ~1.1) has included some support for multiprocessors. The changes that have been introduced are largely related to the scheduling and dispatching of threads in symmetric multiprocessors. It is assumed that the memory allocations will not affect the timing properties of the system and it will be accessed uniformly. This thesis argues that these changes are not enough to support shared memory multiprocessors on RTSJ; and the following issues need to be addressed: \begin{itemize} \item In shared memory multiprocessors, uniform memory access (UMA) systems are not scalable and will be replaced by cache coherent non-uniform memory access (cc-NUMA) systems. Locality can largely affect the performance of applications and cause unpredictable delays in real-time applications on cc-NUMA systems. These delays are caused by the distributed memory layout in cc-NUMA and can be reduced by giving applications more control and visibility into the allocation policies of threads and memory. \item The increased computational power of multiprocessors encourages the platform to be shared by multiple applications. In such an environment, real-time applications require temporal guarantees from the platform to meet their timing requirements. \end{itemize} The key contribution of this thesis is to extend the programming model of RTSJ to provide programmers with locality constraints. Existing support in RTSJ for locality is shown to be very limited and a new locality model is presented which enables programmers to develop portable applications. Applications are divided into multiple partitions and temporal guarantees are provided to partitions allowing them to be analyzed in isolation from the rest of the system. A prototype of the aforementioned model is implemented and tested. A series of experiments are conducted to prove the effectiveness of the model. In particular, the effect of locality is highlighted by performance measuring in a multithreaded environment.
Download or read book Page placement for non uniform memory access time NUMA shared memory multiprocessors written by Richard P. LaRowe and published by . This book was released on 1991 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numa aware Multicore Matrix Multiplication written by Wail Yousef Alkowaileet and published by . This book was released on 2013 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: The emerging Symmetric Multi-Processing (SMP) architectures have shifted from the Shared- Bus topology to Cache-coherent Non-Uniform Memory Access (ccNUMA), where the Pro- cessing Elements (PEs) can access the distributed memories with different delays. This shift potentially impacts the performance of current SMP software packages and the way they address complexity of the new architecture. In this work, we compare our User-level thread scheduling mechanism [16] with OpenMP scheduler to multiply two large matrices on a Dual-socket NUMA architecture. We analyzed and evaluated an optimized and multi- threaded implementation of Level-3 BLAS general matrix multiplication routine (DGEMM). We have shown that addressing the architectural awareness for such a memory intensive op- eration would minimize the memory bottlenecks and improve the utilization of the memory caches and consequently, the overall performance. In this work, we show one way of threads scheduling and data alignment that can reduce the number of cache-misses down to one-third of the cache-misses from the non-tuned implementation and reduce the required computation time by up to 22%. Finally, we show the relationship between the number of cache-misses and the gained speedup percentage of our implementation, which proves our hypothesis about the data locality problem and memory bottleneck in a non NUMA-aware implementation.
Download or read book Non uniform Memory Access written by Gerard Blokdyk and published by Createspace Independent Publishing Platform. This book was released on 2017-10-29 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: Is the impact that Non-uniform memory access has shown? What other jobs or tasks affect the performance of the steps in the Non-uniform memory access process? Will Non-uniform memory access deliverables need to be tested and, if so, by whom? How do you manage and improve your Non-uniform memory access work systems to deliver customer value and achieve organizational success and sustainability? How do we keep improving Non-uniform memory access? Defining, designing, creating, and implementing a process to solve a business challenge or meet a business objective is the most valuable role... In EVERY company, organization and department. Unless you are talking a one-time, single-use project within a business, there should be a process. Whether that process is managed and implemented by humans, AI, or a combination of the two, it needs to be designed by someone with a complex enough perspective to ask the right questions. Someone capable of asking the right questions and step back and say, 'What are we really trying to accomplish here? And is there a different way to look at it?' For more than twenty years, The Art of Service's Self-Assessments empower people who can do just that - whether their title is marketer, entrepreneur, manager, salesperson, consultant, business process manager, executive assistant, IT Manager, CxO etc... - they are the people who rule the future. They are people who watch the process as it happens, and ask the right questions to make the process work better. This book is for managers, advisors, consultants, specialists, professionals and anyone interested in Non-uniform memory access assessment. All the tools you need to an in-depth Non-uniform memory access Self-Assessment. Featuring 488 new and updated case-based questions, organized into seven core areas of process design, this Self-Assessment will help you identify areas in which Non-uniform memory access improvements can be made. In using the questions you will be better able to: - diagnose Non-uniform memory access projects, initiatives, organizations, businesses and processes using accepted diagnostic standards and practices - implement evidence-based best practice strategies aligned with overall goals - integrate recent advances in Non-uniform memory access and process design strategies into practice according to best practice guidelines Using a Self-Assessment tool known as the Non-uniform memory access Scorecard, you will develop a clear picture of which Non-uniform memory access areas need attention. Included with your purchase of the book is the Non-uniform memory access Self-Assessment downloadable resource, which contains all questions and Self-Assessment areas of this book in a ready to use Excel dashboard, including the self-assessment, graphic insights, and project planning automation - all with examples to get you started with the assessment right away. Access instructions can be found in the book. You are free to use the Self-Assessment contents in your presentations and materials for customers without asking us - we are here to help.
