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检索条件"任意字段=21st International Symposium on Computer Architecture and High Performance Computing"

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Accelerating the LOBPCG method on sunway taihulight 21

Accelerating the LOBPCG method on sunway taihulight

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21st IEEE international Conference on high performance computing and Communications, 17th IEEE international Conference on Smart City and 5th IEEE international Conference on Data Science and Systems, HPCC/SmartCity/DSS 2019

作者： Yu, Tianyu Zhao, Yonghua Zhao, Lian Computer Network Information Center Chinese Academy of Sciences University of Chinese Academy of Sciences Beijing China Computer Network Information Center Chinese Academy of Sciences Beijing China

ISBN: (纸本)9781728120584

LOBPCG is a numerical eigensolver which can be parallelly implemented. In this paper, methods of optimization suitable for Sunway TaihuLight are discussed cover the main computations of LOBPCG. Two-level parallel architecture is proposed and followed by the introduction of a communication-avoiding parallel algorithm of sparse matrix-vector product. The algorithm not only overlaps computation and MPI communication but also overlaps data transfer between main memory and the scratch memory on the core group. A data buffering strategy with automatic adjustment during the runtime is proposed. Then, a new implementation of dense matrix multiplication adapted to the Sunway architecture is proposed. The scalability results demonstrate our routines led to significant promotions. We also analyze the performance on the Hamilton matrix from the Density Matrix Renormalization Group (DMRG) method, which is widely used by the computational physicist. © 2019 IEEE.

关键词： Data transfer

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Monte-Carlo Tree Search and Reinforcement Learning for Reconfiguring Data stream Processing on Edge computing 31

Monte-Carlo Tree Search and Reinforcement Learning for Recon...

引用

31st international symposium on computer architecture and high performance computing (SBAC-PAD)

作者： Veith, Alexandre da Silva de Assuncao, Marcos Dias Lefevre, Laurent Claude Bernard Univ Lyon 1 Univ Lyon ENS Lyon CNRSInriaParallel Comp Lab LIP F-69342 Lyon 07 France

ISBN: (纸本)9781728141947

Distributed stream Processing (DSP) applications are increasingly used in new pervasive services that process enormous amounts of data in a seamless and near real-time fashion. Edge computing has emerged as a means to minimise the time to handle events by enabling processing (i.e., operators) to be offloaded from the Cloud to the edges of the Internet, where the data is often generated. Deciding where to execute such operations (i.e., edge or cloud) during application deployment or at runtime is not a trivial problem. In this work, we employ Reinforcement Learning (RL) and Monte-Carlo Tree Search (MCTS) to reassign operators during application runtime. Experimental results show that RL and MCTS algorithms perform better than traditional placement techniques. We also introduce an optimisation to a MCTS algorithm, called MCTS-Best-UCT, that achieves similar latency with fewer operator migrations and faster execution time. In certain scenarios, the time needed by MCTS-Best-UCT to find the best end-to-end latency is at least 33% smaller than the time required by the other algorithms.

关键词： Reinforcement learning

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Web-based system for advanced heart disease identification using grid computing technology

Web-based system for advanced heart disease identification u...

引用

21st IEEE international symposium on computer-Based Medical Systems

作者： Han, Chang Hee Youn, Chan-Hyun Jung, Wooram Information and Communication University

ISBN: (纸本)9780769531656

Heart disease is one of the most serious medical problems which threaten human life. Now there are several methods for detecting heart disease and ECG (Electrocardiogram) signal analysis is one of the typical solutions. The other method such as MCG (Magnetocardiogram) is also recommended for heart disease detection. In computer society, the e-Health systems using these diagnosis methods have been developed. However, each diagnosis method has their own weak points and also limitations in system performance according to the increase of data in quantity. Therefore, in order to improve each diagnosis method and conventional e-Health system, we propose and implement a novel integrated diagnosis system combining grid technologies which is termed as a Physio-Grid system. We present the experimental and evaluation data in order to show our system capability in diagnosis and system performance. The results indicate that the proposed e-Health system can provide the plausible medical services and also it guarantees high reliability and system performance in data management and in diagnosis.

关键词： Information management

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Characterizations and architectural implications of NVM's external DRAM cache 21

Characterizations and architectural implications of NVM's ex...

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作者： Pan, Haiyang Liu, Yuhang Lu, Tianyue Chen, Mingyu University of Chinese Academy of Sciences Beijing China State Key Laboratory of Computer Architecture Institute of Computing Technology CAS Beijing China Peng Cheng Laboratory Shenzhen China

ISBN: (纸本)9781728120584

To meet the memory capacity requirement of big-data applications, a promising architecture is that NVM (Non-Volatile Memory) is used as main memory and external DRAM (off-chip) is used as cache. Compared to LLC versus DRAM (referred to as L-DRAM), external DRAM cache versus NVM main memory (referred to as E-NVM) are significantly different in terms of capacity and latency, thus traditional design cannot be directly borrowed without reconsideration. In this paper, we explore the characteristics and architectural implications of E-NVM in diverse dimensions including cache line granularity, associativity, replacement policy and prefetching methods. Lots of hints have been found for the optimal design of this emerging architecture. © 2019 IEEE.

关键词： Dynamic random access storage

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LibBFT: a high-Performace Timed Automata Library Collection for Byzantine Fault Tolerance 31

LibBFT: a High-Performace Timed Automata Library Collection ...

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31st international symposium on computer architecture and high performance computing (SBAC-PAD)

作者： Araujo, Rodolfo Pereira Coelho, Igor Machado Ochi, Luiz Satoru Coelho, Vitor Nazario Univ Estado Rio de Janeiro Grad Program Computat Sci PPG CComp Rio De Janeiro Brazil Univ Fed Fluminense Inst Comp Niteroi RJ Brazil OptBlocks Belo Horizonte MG Brazil

ISBN: (纸本)9781728141947

This paper describes a novel high-performance library collection called libbft, specially designed to deal with byzantine fault tolerance for consensus mechanisms. This library is inspired by timed automata theory, and by the groundbreaking work of Practical Byzantine Fault Tolerance (PBFT). As case study, we tackle recently proposed consensus algorithms, such as the Delegated Byzantine Fault Tolerance (dBFT) used on the NEO Blockchain. This library is organized in a multiprogramming language paradigm, being already implemented on C++ and Golang. The library handles states and transitions from regular automata machines, besides timed transitions, activated through conditions, actions and events. We also propose a mathematical notation to represent these elements, and an automatic tool to export the generated state machine into graphviz platform. We also integrate the library with state-of-the-art communication protocols, like the gRPC (Google RPC) and protobuf, which provides efficient and language-independent communication. This paper briefly describes the technological background behind libbft, practical applications and preliminary computational experiments.

关键词： Timed Automata Consensus Byzantine Fault Tolerance NEO Blockchain Distributed computing dBFT

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A prototype multithreaded associative SIMD processor

A prototype multithreaded associative SIMD processor

引用

21st international Parallel and Distributed Processing symposium, IPDPS 2007

作者： Schaffer, Kevin Walker, Robert A. Department of Computer Science Kent State University Kent OH 44242

ISBN: (纸本)1424409101

The performance of SIMD processors is often limited by the time it takes to transfer data between the centralized control unit and the parallel processor array. This is especially true of hybrid SIMD models, such as associative computing, that make extensive use of global search operations. Pipelining instruction broadcast can help, but is not enough to solve the problem, especially for massively parallel processors with thousands of processing elements. In this paper, we describe a SIMD processor architecture that combines a fully pipelined broadcast/reduction network with hardware multithreading to reduce performance degradation as the number of processors is scaled up. © 2007 IEEE.

关键词： Program processors

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Towards a Transprecision Polymorphic Floating-Point Unit for Mixed-precision computing 31

Towards a Transprecision Polymorphic Floating-Point Unit for...

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31st international symposium on computer architecture and high performance computing (SBAC-PAD)

作者： Linhares, Alisson Azevedo, Rodolfo Univ Campinas Unicamp Inst Comp Campinas Brazil

ISBN: (纸本)9781728141947

Mixed-precision is a paradigm that tries to combine computations with different levels of precision to compose results. This approach has been used extensively to optimize scientific applications and has shown speed and energy gains, without causing any relevant precision loss. However, to exploit mixed precision opportunities most applications need to be recompiled to use different instructions and types. Thus, in this work, we present a new floating-point unit design, able to automatically decide when an instruction should be executed using less precision, without recompilation or user direct intervention. Our proposal takes advantage of ad-hoc polymorphism to perform computations with different data types, dynamically selecting a proper instruction on demand, and can also be configured according to overall precision requirements. Our simulated results show that, for some doubleprecision benchmarks, we are able to execute more than 90% of all floating-point operations in half-precision, without affecting its accuracy and resulting in a precision error below 1%. In addition, this new technology may increase instruction level parallelism and cut down the necessity for type casting operations.

关键词： Transprecision Mixed-Precision Floating-Point Unit RISC-V

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Secure and Scalable Cloud-based architecture for e-Health Wireless sensor networks

Secure and Scalable Cloud-based Architecture for e-Health Wi...

引用

21st international Conference on computer Communications and Networks (ICCCN)

作者： Lounis, Ahmed Hadjidj, Abdelkrim Bouabdallah, Abdelmadjid Challal, Yacine Univ Technol Compiegne HEUDIASYC UMR CNRS 7253 F-60206 Compiegne France

ISBN: (纸本)9781467315449;9781467315425

There has been a host of research works on wireless sensor networks for medical applications. However, the major shortcoming of these efforts is a lack of consideration of data management. Indeed, the huge amount of high sensitive data generated and collected by medical sensor networks introduces several challenges that existing architectures cannot solve. These challenges include scalability, availability and security. In this paper, we propose an innovative architecture for collecting and accessing large amount of data generated by medical sensor networks. Our architecture resolves all the aforementioned challenges and makes easy information sharing between healthcare professionals. Furthermore, we propose an effective and flexible security mechanism that guarantees confidentiality, integrity as well as fine grained access control to outsourced medical data. This mechanism combines several cryptographic schemes to achieve high flexibility and performance.

关键词： wireless sensor networks healthcare cloud computing attribute based encryption

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Spatial Multiplexing based on Distributed Antenna Arrays for Mobile WiMAX Networks

Spatial Multiplexing based on Distributed Antenna Arrays for...

引用

21st Annual IEEE international symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Papathanasiou, Christos Dimitriou, Nikos Tassiulas, Leandros Univ Thessaly Ctr Res & Technol Thessaloniki Greece Univ Athens Inst Accelerating Syst & Applicat GR-10679 Athens Greece

ISBN: (纸本)9781424480166

A novel cell architecture based on Distributed Antenna Arrays for next generation mobile WiMAX systems is proposed. By exploiting Spatial Multiplexing and beamforming techniques, our target is to maximize the throughput of a high speed user by keeping low the deployment costs. Radio over Fiber is one of the best solutions to feed from a central point distributed arrays and share wireless resources with flexibility. The new architecture is compared to the case of using co-located antenna systems. Simulation results evaluate the enhancement in the system performance that is achieved by using the proposed methods at the transmitter and the receiver sides with different complexity.

关键词： WiMax antenna arrays beamforming technique cell architecture co-located antenna system computer network performance evaluation distributed antenna arrays next generation mobile WiMAX system next generation networks radio over fiber radio receivers radio transmitters radio-over-fibre receiver resource allocation space division multiplexing spatial multiplexing system performance evaluation transmitter wireless resource sharing

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ZSS Signature Based Data Integrity Verification for Mobile Edge computing 21

ZSS Signature Based Data Integrity Verification for Mobile E...

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21st IEEE/ACM international symposium on Cluster, Cloud and Internet computing (CCGrid)

作者： Wang, Haiyan Zhang, Jiawei Lin, Yi Huang, Haiping Nanjing Univ Posts & Telecommun Sch Comp Sci Nanjing Peoples R China Jiangsu Co Ltd China Mobile Grp Nanjing Peoples R China

ISBN: (纸本)9781728195865

Mobile edge computing (MEC), which merits in reducing response time by executing services in close proximity to end devices, has recently emerged as one of promising solutions for mobile services and hence attracted increasing research. Edge nodes usually pre-download parts of private data which are stored in the cloud to enable end devices' fast access, which mitigates overburden of the centralized cloud. However, malicious attackers or unreliable services providers may corrupt with those private data on edge servers. To this end, how to validate data integrity in MEC environment safely and efficiently has become a crucial problem. In this paper, we propose a ZSS Signature based Data Integrity Verification solution for MEC (ZSDIV-MEC), which supports privacy protection and public auditing by introducing a third party auditor (TPA) and the employment of ZSS signature scheme. In the proposed ZSDIV-MEC, system architecture is described followed with a detailed verification protocol, which takes full consideration of verification for data on three cases including single edge, multiple edges, and a joint of multiple edges and the center cloud. performance analysis of the protocol including feasibility, security, privacy, and dynamicity is discussed respectively. Experimental results in comparison with baseline schemes demonstrate that our solution has better performance in data verification and computation overhead.

关键词： mobile edge computing data integrity verification short signature

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