Download or read book Analysis of Shared Memory in Multi core Systems written by Jaya Chaitanya V S L V N and published by . This book was released on 2015 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: In a multi-core system, the memory hierarchy and the interconnection network play a dominant role in deciding the performance of the system. In this research, we analyze the dependence of system performance on the interconnection network and memory hierarchy using a set of scientific and engineering workloads. A configuration with a smaller network has low memory access latency, but is more susceptible to memory access conflicts due to fewer memory banks. The extra delay originated from the concurrent memory access conflicts may offset the benefit of shorter latency. So, in this case a larger network with more number of memory banks can benefit from high number of concurrent memory access. This analysis reveals an important tradeoff between employing different sizes of network. Cache sharing on a multi-core processor is usually competitive. Cache coherence problems associated with private caches and the improvement in performance with sharing is analyzed in the last chapter.

Download or read book Thread and Data Mapping for Multicore Systems written by Eduardo H. M. Cruz and published by Springer. This book was released on 2018-07-04 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a study on how thread and data mapping techniques can be used to improve the performance of multi-core architectures. It describes how the memory hierarchy introduces non-uniform memory access, and how mapping can be used to reduce the memory access latency in current hardware architectures. On the software side, this book describes the characteristics present in parallel applications that are used by mapping techniques to improve memory access. Several state-of-the-art methods are analyzed, and the benefits and drawbacks of each one are identified.

Download or read book Use of Shared Memory in the Context of Embedded Multi core Processors Exploration of the Technology and Its Limits written by and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern embedded systems embrace many-core shared-memory designs. Due to constrained power and area budgets, most of them feature software-managed scratchpad memories instead of data caches to increase the data locality. It is therefore programmers' responsibility to explicitly manage the memory transfers, and this make programming these platform cumbersome. Moreover, complex modern applications must be adequately parallelized before they can the parallel potential of the platform into actual performance. To support this, programming languages were proposed, which work at a high level of abstraction, and rely on a runtime whose cost hinders performance, especially in embedded systems, where resources and power budget are constrained. This dissertation explores the applicability of the shared-memory paradigm on modern many-core systems, focusing on the ease-of-programming. It focuses on OpenMP, the de-facto standard for shared memory programming. In a first part, the cost of algorithms for synchronization and data partitioning are analyzed, and they are adapted to modern embedded many-cores. Then, the original design of an OpenMP runtime library is presented, which supports complex forms of parallelism such as multi-level and irregular parallelism. In the second part of the thesis, the focus is on heterogeneous systems, where hardware accelerators are coupled to (many- )cores to implement key functional kernels with orders-of-magnitude of speedup and energy efficiency compared to the "pure software" version. However, three main issues rise, namely i) platform design complexity, ii) architectural scalability and iii) programmability. To tackle them, a template for a generic hardware processing unit (HWPU) is proposed, which share the memory banks with cores, and the template for a scalable architecture is shown, which integrates them through the shared-memory system. Then, a full software stack and toolchain are developed to support platform design and to let programmer

Download or read book Predictable Shared Memory Resources for Multi core Real time Systems written by Mohamed Hassan and published by . This book was released on 2017 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: A major challenge in multi-core real-time systems is the interference problem on the shared hardware components amongst cores. Examples of these shared components include buses, on-chip caches, and off-chip dynamic random access memories (DRAMs). The problem arises because different cores in the system interfere with each other, while competing to access the shared hardware components. It is a challenging problem for real-time systems because operations of one core affect the temporal behaviour of other cores, which complicates the timing analysis of the system. We address this problem by making the following contributions. 1) For shared buses, we propose CArb, a predictable and criticality-aware arbiter, which provides guaranteed and differential service to tasks based on their requirements. In addition, we utilize CArb to mitigate overheads resulting from system switching among different modes. 2) For the cache hierarchy, we address the problem of maintaining cache coherence in multi-core real-time systems by modifying current coherence protocols such that data sharing is viable for real-time systems in a manner amenable for timing analysis. The proposed solution provides performance improvements, does not impose any scheduling restrictions, and does not require any source-code modifications. 3) At the shared DRAM level, we propose PMC, a programmable memory controller that provides latency guarantees for running tasks upon accessing the off-chip DRAM, while assigning differential memory services to tasks based on their bandwidth and latency requirements. In addition to PMC, we conduct a latency-based analysis on DRAM memory controllers (MCs). Our analysis provides both best-case and worst-case bounds on the latency that any request suffers upon accessing the DRAM. The analysis comprehensively covers all possible interactions of successive requests considering all possible DRAM states. Finally, we formally model request interrelations and DRAM command interactions. We use these models to develop an automated validation framework along with benchmark suites to validate and evaluate PMC and any other MC, which we release as an open-source tool.

Download or read book Memory Subsystem in Multicore Architectures written by Vahid Roostaie and published by LAP Lambert Academic Publishing. This book was released on 2014-11-19 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cache coherency and memory consistency are of the most decisive and challenging issues in the design of shared-memory multi-core systems that influence both the correctness and performance of parallel programs. In this book, we identify and analyze the problem of designing a coherent/consistent memory subsystem in general and then focus on FPGA-based multi-core embedded systems containing general purpose CPU's and dedicated hardware accelerators. We narrow down the range of the problem by targeting only the stream-based applications and developing dedicated application-specific solutions. A flexible Windowed-FIFO communication pattern is proposed to be used by the parallel programs being run on the multi-core system. The software APIs for the FPGA platform are implemented and tested, a customized streaming cache memory is designed, implemented and tested based on the proposed communication pattern and in the end, example embedded systems are developed and tested on the FPGA platform to prove the correct functionality of the APIs, the cache memory and the coherent data communication between the cores.

Download or read book Cross layer Co design of Shared Memory Multi core Systems written by Bo-Cheng Lai and published by . This book was released on 2007 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: The contribution of this dissertation to the design community is an accurate and flexible cross-layer design framework and the associated design methodology for a multi-threaded shared-memory symmetric multi-processing (SMP) system. The research methodology adopted by the dissertation leads the study in three steps. Each step forms an important part for the cross-layer design of a multi-processor system.

Download or read book Performance Analysis of a Hierarchical Cache coherent Shared Memory Based Multi processor System written by Raman Nayyar and published by . This book was released on 1993 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Shared Memory Application Programming written by Victor Alessandrini and published by Morgan Kaufmann. This book was released on 2015-11-06 with total page 557 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shared Memory Application Programming presents the key concepts and applications of parallel programming, in an accessible and engaging style applicable to developers across many domains. Multithreaded programming is today a core technology, at the basis of all software development projects in any branch of applied computer science. This book guides readers to develop insights about threaded programming and introduces two popular platforms for multicore development: OpenMP and Intel Threading Building Blocks (TBB). Author Victor Alessandrini leverages his rich experience to explain each platform's design strategies, analyzing the focus and strengths underlying their often complementary capabilities, as well as their interoperability. The book is divided into two parts: the first develops the essential concepts of thread management and synchronization, discussing the way they are implemented in native multithreading libraries (Windows threads, Pthreads) as well as in the modern C++11 threads standard. The second provides an in-depth discussion of TBB and OpenMP including the latest features in OpenMP 4.0 extensions to ensure readers' skills are fully up to date. Focus progressively shifts from traditional thread parallelism to modern task parallelism deployed by modern programming environments. Several chapter include examples drawn from a variety of disciplines, including molecular dynamics and image processing, with full source code and a software library incorporating a number of utilities that readers can adapt into their own projects. - Designed to introduce threading and multicore programming to teach modern coding strategies for developers in applied computing - Leverages author Victor Alessandrini's rich experience to explain each platform's design strategies, analyzing the focus and strengths underlying their often complementary capabilities, as well as their interoperability - Includes complete, up-to-date discussions of OpenMP 4.0 and TBB - Based on the author's training sessions, including information on source code and software libraries which can be repurposed

Download or read book Performance Analysis of a Hierarchical Cache coherent Shared Memory Based Multi processor System written by Raman Nayyar and published by . This book was released on 1993 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Real time Prefetching on Shared memory Multi core Systems written by Jamie Garside and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Embedded Memory Design for Multi Core and Systems on Chip written by Baker Mohammad and published by Springer Science & Business Media. This book was released on 2013-10-22 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the various tradeoffs systems designers face when designing embedded memory. Readers designing multi-core systems and systems on chip will benefit from the discussion of different topics from memory architecture, array organization, circuit design techniques and design for test. The presentation enables a multi-disciplinary approach to chip design, which bridges the gap between the architecture level and circuit level, in order to address yield, reliability and power-related issues for embedded memory.

Download or read book Programming Multicore and Many core Computing Systems written by Sabri Pllana and published by John Wiley & Sons. This book was released on 2017-01-23 with total page 525 pages. Available in PDF, EPUB and Kindle. Book excerpt: Programming multi-core and many-core computing systems Sabri Pllana, Linnaeus University, Sweden Fatos Xhafa, Technical University of Catalonia, Spain Provides state-of-the-art methods for programming multi-core and many-core systems The book comprises a selection of twenty two chapters covering: fundamental techniques and algorithms; programming approaches; methodologies and frameworks; scheduling and management; testing and evaluation methodologies; and case studies for programming multi-core and many-core systems. Program development for multi-core processors, especially for heterogeneous multi-core processors, is significantly more complex than for single-core processors. However, programmers have been traditionally trained for the development of sequential programs, and only a small percentage of them have experience with parallel programming. In the past, only a relatively small group of programmers interested in High Performance Computing (HPC) was concerned with the parallel programming issues, but the situation has changed dramatically with the appearance of multi-core processors on commonly used computing systems. It is expected that with the pervasiveness of multi-core processors, parallel programming will become mainstream. The pervasiveness of multi-core processors affects a large spectrum of systems, from embedded and general-purpose, to high-end computing systems. This book assists programmers in mastering the efficient programming of multi-core systems, which is of paramount importance for the software-intensive industry towards a more effective product-development cycle. Key features: Lessons, challenges, and roadmaps ahead. Contains real world examples and case studies. Helps programmers in mastering the efficient programming of multi-core and many-core systems. The book serves as a reference for a larger audience of practitioners, young researchers and graduate level students. A basic level of programming knowledge is required to use this book.

Download or read book Scalable Multi core Architectures written by Dimitrios Soudris and published by Springer Science & Business Media. This book was released on 2011-10-17 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: As Moore’s law continues to unfold, two important trends have recently emerged. First, the growth of chip capacity is translated into a corresponding increase of number of cores. Second, the parallelization of the computation and 3D integration technologies lead to distributed memory architectures. This book describes recent research that addresses urgent challenges in many-core architectures and application mapping. It addresses the architectural design of many core chips, memory and data management, power management, design and programming methodologies. It also describes how new techniques have been applied in various industrial case studies.

Download or read book A Pipelined Multi core MIPS Machine written by Mikhail Kovalev and published by Springer. This book was released on 2014-11-24 with total page 359 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph is based on the third author's lectures on computer architecture, given in the summer semester 2013 at Saarland University, Germany. It contains a gate level construction of a multi-core machine with pipelined MIPS processor cores and a sequentially consistent shared memory. The book contains the first correctness proofs for both the gate level implementation of a multi-core processor and also of a cache based sequentially consistent shared memory. This opens the way to the formal verification of synthesizable hardware for multi-core processors in the future. Constructions are in a gate level hardware model and thus deterministic. In contrast the reference models against which correctness is shown are nondeterministic. The development of the additional machinery for these proofs and the correctness proof of the shared memory at the gate level are the main technical contributions of this work.

Download or read book Multi Core Cache Hierarchies written by Rajeev Balasubramonian and published by Springer Nature. This book was released on 2022-06-01 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt: A key determinant of overall system performance and power dissipation is the cache hierarchy since access to off-chip memory consumes many more cycles and energy than on-chip accesses. In addition, multi-core processors are expected to place ever higher bandwidth demands on the memory system. All these issues make it important to avoid off-chip memory access by improving the efficiency of the on-chip cache. Future multi-core processors will have many large cache banks connected by a network and shared by many cores. Hence, many important problems must be solved: cache resources must be allocated across many cores, data must be placed in cache banks that are near the accessing core, and the most important data must be identified for retention. Finally, difficulties in scaling existing technologies require adapting to and exploiting new technology constraints. The book attempts a synthesis of recent cache research that has focused on innovations for multi-core processors. It is an excellent starting point for early-stage graduate students, researchers, and practitioners who wish to understand the landscape of recent cache research. The book is suitable as a reference for advanced computer architecture classes as well as for experienced researchers and VLSI engineers. Table of Contents: Basic Elements of Large Cache Design / Organizing Data in CMP Last Level Caches / Policies Impacting Cache Hit Rates / Interconnection Networks within Large Caches / Technology / Concluding Remarks

Download or read book Design and Analysis of High Performance Cache Memories for Shared Memory Multiprocessor Systems written by Gunjan K. Sinha and published by . This book was released on 1991 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scalable Shared Memory Multiprocessors written by Michel Dubois and published by Springer Science & Business Media. This book was released on 1992 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mathematics of Computing -- Parallelism.