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检索条件"任意字段=19th IASTED International Conference on Parallel and Distributed Computing and Systems"

共 564 条记录，以下是281-290 订阅

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Dynamic I/O Reconfiguration for a NFS-based parallel File System

Dynamic I/O Reconfiguration for a NFS-based Parallel File Sy...

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19th international Euromicro conference on parallel, distributed and Network-Based Processing (PDP)

作者： Kassick, Rodrigo Boito, Francieli Zanon Navaux, Philippe O. A. Univ Fed Rio Grande do Sul Inst Informat Porto Alegre RS Brazil

ISBN: (纸本)9780769543284

the large gap between the speed in which data can be processed and the performance of I/O devices makes the shared storage infrastructure of a cluster a great bottleneck. parallel File systems try to smooth such difference by distributing data onto several servers, increasing the system's available bandwidth. However, most implementations use a fixed number of I/O servers, defined during the initialization of the system, and can not add new resources without a complete redistribution of the existing data. With the execution of different applications at the same time, the concurrent access to these resources can aggravate the existing bottleneck, making very hard to define an initial number of servers that satisfies the performance requirements of different applications. this paper presents a reconfiguration mechanism for the dNFSp file system that uses on-line monitoring of application's I/O behavior to detect performance contention and dedicate more I/O resources to applications with higher demands. these extra resources are taken from the available nodes of the cluster, using their I/O devices as a temporary storage. We show that this strategy is capable of increasing the I/O performance in up to 200% for access patterns with short I/O phases and 47% for longer I/O phases.

关键词： distributed File systems parallel I/O File systems IO Servers large clearance ON-LINE MONITORS scratch memory

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Towards Scaling parallel Seismic Raytracing 19

Towards Scaling Parallel Seismic Raytracing

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19th IEEE international conference on Computational Science and Engineering, 14th IEEE international conference on Embedded and Ubiquitous computing and 15th international Symposium on distributed computing and Applications to Business, Engineering and Science, CSE-EUC-DCABES 2016

作者： Malony, Allen D. Monil, Mohammad Alaul Haque Rasmusen, Craig Huck, Kevin Byrnes, Joseph Toomey, Doug Department of Computer and Information Science University of Oregon EugeneOR97403 United States Department of Physics Performance Research Laboratory University of Oregon EugeneOR97403 United States Department of Geological Sciences University of Oregon EugeneOR97403 United States

ISBN: (纸本)9781509035939

Marine geologists use seismic tomography techniques to determine the 3D geophysical structure of the ocean floor. At the heart of seismic tomography methods is a forward solver used to compute minimum travel times from all locations in a earth model to sensors used in seismic experiments. the Stingray seismic raytracer was originally based on an adaption of Dijkstra's single-source shortest-path algorithm. Unfortunately, the algorithm's inherent sequential nature limits its scalability. Our new parallel Stingray implementations are based on an iterative data parallel algorithm and demonstrates scalable performance in both time and problem size. Results are presented for OpenMP and MPI experiments on seismic models of significantly larger size than Stingray has processed before. © 2016 IEEE.

关键词： Seismology

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the Future of Accelerator Programming: Abstraction, Performance or Can We Have Both?

The Future of Accelerator Programming: Abstraction, Performa...

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19th IEEE international conference on parallel and distributed systems (ICPADS)

作者： Rocki, Kamil Burtscher, Martin Suda, Reiji Univ Tokyo Dept Comp Sci Grad Sch Informat Sci & Technol Bunkyo Ku Tokyo Japan SW Texas State Univ Dept Comp Sci San Marcos TX 78666 USA

ISBN: (纸本)9781479920815

In a perfect world, code would only be written once and would run on different devices with high efficiency. A programmer's time would primarily be spent on thinking about the algorithms and data structures, not on implementing them. To a degree, that used to be the case in the era of frequency scaling on a single core. However, due to power limitations, parallel programming has become necessary to obtain performance gains. But parallel architectures differ substantially from each other, often require specialized knowledge, and typically necessitate reimplementation and fine tuning of application code. these slow tasks frequently result in situations where most of the time is spent reimplementing old rather than writing new code. the goal of our research is to find new programming techniques that increase productivity, maintain high performance, and provide abstraction to free the programmer from these unnecessary and time-consuming tasks. However, such techniques usually come at the cost of substantial performance degradation. this paper investigates current approaches to portable accelerator programming, seeking to answer whether they make it possible to combine high efficiency with sufficient algorithm abstraction. It discusses OpenCL as a potential solution and presents three approaches of writing portable code: GPU-centric, CPU-centric and combined. By applying the three approaches to a real-world program, we show that it is at least sometimes possible to run exactly the same code on many different devices with minimal performance degradation using parameterization. the main contributions of this paper are an extensive review of the current state-of-the-art regarding the stated problem and our original approach of addressing this problem with a generalized excessive-parallelism approach.

关键词： CPU GPU Manycore parallel Programming

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Using unfolding to minimize inter-iteration dependencies

Using unfolding to minimize inter-iteration dependencies

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Proceedings of the 16th iasted international conference on parallel and distributed computing and systems

作者： O'Neil, Timothy W. Sha, Edwin H.-M. Computer Science Dept. University of Akron Akron OH 44325-4002 Computer Science Dept. Univ. of Texas at Dallas Richardson TX 75083-0688

Since data dependencies greatly decrease instruction level parallelism, minimizing dependencies becomes a crucial part of the process of parallelizing sequential code. Eliminating all unnecessary hazards leads to the more efficient use of resources, fewer processor stalls and easily maintainable code. Previously we proposed a novel approach for eliminating redundant data dependencies from code. In this paper, we review this method and show how this elimination technique may be combined with unfolding so as to parallelize code even further.

关键词： parallel processing systems

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Adaptation of conditional optimization algorithm using modified complex box method for synthesis in electrodynamics on the basis of distributed and parallel calculations systems

Adaptation of conditional optimization algorithm using modif...

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KpbiMuKo 2009 CriMiCo - 2009 19th international Crimean conference Microwave and Telecommunication Technology

作者： Savin, A.N. Zhnichkov, R.Yu. Timofeeva, N.E. Saratov State University 155 Moskovskaya str. Saratov 410012 Russia

the results of application of an effective method of a search for global extremum for a problem solution of optimization of parameters of waveguide structures by specified electrodynamics characteristics on systems of... 详细信息

ISBN: (纸本)9789663352497

关键词： Electrodynamics

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A distributed Abnormal Packet Generation Engine Based on MapReduce

A Distributed Abnormal Packet Generation Engine Based on Map...

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19th international conference on High Performance computing (HiPC)

作者： Zhang Qi-fei Lv Hong-bin Pan Xue-zeng Wang Chao Li Wen-juan Zhejiang Univ Coll Comp Sci & Technol Hangzhou 310027 Zhejiang Peoples R China Hangzhou Normal Univ Coll Qianjiang Hangzhou 310036 Zhejiang Peoples R China

ISBN: (纸本)9781467323703;9781467323727

With the maturity of Internet and rapid development of the Mobile Internet, the network protocols drafted by IETF, 3GPP, 3GPP2 and other standard organizations grow massively, and at the same time attacks against the network protocols are also increasing rapidly. the Robustness test for the network protocols is becoming increasingly important, since the protocols and applications will be absolutely safe if the protocols have been tested according to the requirements of the Robustness Test. But Robustness Test is different from Conformance Test, Interoperability Test and Performance Test in its requirement of a huge number of test cases, and the number of test cases is more than 2(boolean AND)320 for a packet with 40-Byte protocol header, thus, it's too difficult to generate all the test cases for the serial algorithm. In this paper a parallel algorithm based on MapReduce is proposed, where an original input packet is divided into different fields and the Map function processes on each single field and the Reduce function reassembles the processed fields to a new completed packet. Finally, experiment results show the parallel algorithm is far better than the serial algorithm when generating large data set. In addition, the scalability of the cluster is also verified.

关键词： MapReduce parallel computing Robustness testing Abnormal Packet Hadoop

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Spatio-temporal responses of a class of 2 x 2 hyperbolic systems 19

Spatio-temporal responses of a class of 2 x 2 hyperbolic sys...

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19th international conference on Methods and Models in Automation and Robotics (MMAR)

作者： Bartecki, Krzysztof Opole Univ Technol Inst Control & Comp Engn PL-45272 Opole Poland

ISBN: (纸本)9781479950812

Results of the spatio-temporal analysis of a class of distributed parameter systems described by hyperbolic partial differential equations defined on a one-dimensional spatial domain are presented. For the case of the two boundary inputs of Dirichlet type applied at the same point of the spatial domain, the analytical expressions for the impulse response functions are derived based on the inverse Laplace transform of individual elements of the 2 x 2 transfer function matrix. the considerations are illustrated with a practical example of a coaxial heat exchanger operating in parallel-flow mode which correspond to the analyzed boundary conditions.

关键词： Laplace transforms control system analysis distributed control hyperbolic equations matrix algebra partial differential equations Dirichlet type boundary inputs boundary conditions coaxial heat exchanger distributed parameter systems hyperbolic partial differential equations hyperbolic systems inverse Laplace transform one-dimensional spatial domain parallel-flow mode spatio-temporal analysis spatio-temporal response transfer function matrix Boundary conditions Equations Laplace equations Resistance heating Transfer functions Transmission line matrix methods transmission line matrix methods inverse Laplace transform hyperbolic systems distributed parameter systems Boundary conditions Resistance heating Laplace's equation Laplace transform Control system analysis TRANSFER FUNCTIONS hyperbolic equations Differential equations matrix algebra decentralised control Spatio-Temporal Analysis

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Signature-free communication and agreement in the presence of Byzantine processes 19

Signature-free communication and agreement in the presence o...

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19th international conference on Principles of distributed systems, OPODIS 2015

作者： Raynal, Michel Institut Universitaire de France Paris France IRISA Université de Rennes Rennes France

ISBN: (纸本)9783939897989

Communication and agreement are fundamental abstractions in any distributed system. (If the computing entities do not need to communicate or agree in one way or another, the system is not a distributed system!) this tutorial was devoted to the design of such abstractions built on top of signature-free asynchronous distributed systems prone to Byzantine process failures. It is made up of three parts, each devoted to an abstraction and algorithms that implement it. © Michel Raynal.

关键词： parallel algorithms

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distributed branch-and-bound scheme for solving the winner determination problem in combinatorial auctions

Distributed branch-and-bound scheme for solving the winner d...

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19th international conference on Advanced Information Networking and Applications

作者： Fujita, S Tagashira, S Qiao, C Mito, M Hiroshima Univ Grad Sch Engn Dept Informat Engn Higashihiroshima 7398527 Japan

ISBN: (纸本)0769522491

In this paper we propose a new class of parallel branch-and-bound (B&B) schemes. the main idea of the scheme is to focus oil the functional parallelism instead of conventional data parallelism, and to support such a heterogeneous and irregular parallelism by using a collection of autonomous agents distributed over the network. After examining several design issues toward the implementation of a prototype of the distributed B&B system, we illustrate the result of our preliminary experiments conducted to estimate the performance of the proposed scheme. the result shows that it could cause a significant performance improvement if each agent autonomously changes its function type according to the change of the underlying environment.

关键词： distributed computer systems

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TEEp: Supporting Secure parallel Processing in ARM TrustZone 26

TEEp: Supporting Secure Parallel Processing in ARM TrustZone

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26th IEEE international conference on parallel and distributed systems (IEEE ICPADS)

作者： Li, Zinan Li, Wenhao Xia, Yubin Zang, Binyu Shanghai Jiao Tong Univ Inst Parallel & Distributed Syst Shanghai Peoples R China

ISBN: (纸本)9781728190747

Machine learning applications are getting prevelent on various computing platforms, including cloud servers, smart phones, IoT devices, etc. For these applications, security is one of the most emergent requirements. While trusted execution environment (TEE) like ARM TrustZone has been widely used to protect critical prodecures including fingerprint authentication and mobile payment, state-of-the-art implementations of TEE OS lack the support for multi-threading and are not suitable for computing-intensive workloads. this is because current TEE OSes are usually designed for hosting security critical tasks, which are typically small and non computing-intensive. thus, most of TEE OSes do not support multi-threading in order to minimize the size of the trusted computing base (TCB). In this paper, we propose TEEp, a system that enables multi-threading in TEE without weakening security, and supports existing multi-threaded applications to run directly in TEE. Our design includes a novel multi-threading mechanism based on the cooperation between the TEE OS and the host OS, without trusting the host OS. We implement our system based on OP-TEE and port it to two platforms: a HiKey 970 development board as mobile platform, and a Huawei Hi1610 ARM server as server platform. We run TensorFlow Lite on the development board and TensorFlow on the server for performance evaluation in TEE. the result shows that our system can improve the throughput of TensorFlow Lite on 5 models to 3.2x when 4 cores are available, with 13.5% overhead compared with Linux on average.

关键词： Multi-threading parallel processing TEE Trust-Zone

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