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Optimizing Cellular Automata Execution by distributed Discrete Event Simulation Techniques 28

Optimizing Cellular Automata Execution by Distributed Discre...

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28th Euromicro International conference on parallel, distributed and Network-Based processing (PDP)

作者： Giordano, Andrea D'Ambrosio, Donato Kongo, Rocco Spataro, William De Rango, Alessi CNR ICAR Cosenza Italy Univ Calabria Dept Matemat & Comp Sci Cosenza Italy Univ Calabria Dept Environm Engn Cosenza Italy

ISBN: (纸本)9781728165820

Cellular Automata (CA) are parallel models well suited for studying complex systems that are based on local rules of evolution. Notable examples of application are found in fluid-dynamics, crowd simulation, flow-simulation and many more. Nevertheless, CA can be fruitfully exploited as a support in numerical approaches, such as finite element and finite volume methods. Though easily parallelizable by domain partitioning among the nodes of a parallel system, the performance and scalability of cellular automata executed on parallel/distributed machines are limited due to the need of synchronizing nodes at each computational step. With the aim of reducing the synchronization burden, we here present a preliminary study on techniques stemmed from the Discrete Event Simulation field for the optimization of CA on distributed memory architectures. Preliminary results, executed in a distributed memory environment, have shown the usefulness of the considered approach in reducing execution times and therefore in improving the speed up of the parallel execution of the test case.

关键词： MPI Cellular Automata Discrete Event Simulation Lookahead Software Tools Modelling and Simulation

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A rotate-tiling image composition method for parallel volume rendering on distributed memory multicomputers 15

A rotate-tiling image composition method for parallel volume...

引用

15th International parallel and distributed processing Symposium, IPDPS 2001

作者： Lin, Chin-Feng Yang, Don-Lin Chung, Yeh-Ching Department of Information Engineering Feng Chia University Taichung407 Taiwan

ISBN: (纸本)0769509908

The binary-swap and the parallel-pipelined methods are two popular image composition methods for volume rendering on distributed memory multicomputers. However, these methods either restrict the number of processors to a power of two or require many steps to transform image data that results in high communication overheads. In this paper, we present an efficient image composition method, the rotate-tiling (RT), for parallel volume rendering on distributed memory multicomputers. The RT method can fully utilize all available processors and minimize the communication overheads. In addition, we provide data compression method, the template run-length encoding (TRLE), to further reduce the communication data size. To evaluate the performance of the RT method, we compare the proposed method with the binary-swap method and the parallel-pipelined method. Both theoretical analysis and experimental test are conducted. In the theoretical analysis, we analyze the best performance bound of the RT method in terms of the startup time, the data transmission time, the number of processors, and the number of initial block of a sub-image. In the experimental test, we have implemented these three methods on an SP2 parallel machine. Three volume datasets are used as test samples. The experimental results show that our method outperforms the binary-swap and the parallel-pipelined methods for all test samples and match the results analyzed in the theoretical analysis. For the TRLE method, the experimental results show that the TRLE method can further reduce the composition time for these three methods. © 2001 IEEE.

关键词： Signal encoding

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Efficient global object space support for distributed JVM on cluster

Efficient global object space support for distributed JVM on...

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31st International conference on parallel processing (ICPP 2002)

作者： Fang, WJ Wang, CL Lau, FCM Univ Hong Kong Dept Comp Sci & Informat Syst Hong Kong Hong Kong Peoples R China

ISBN: (纸本)0769516777

We present the design of a global object space in a distributed Java Virtual Machine that supports parallel execution of a multi-threaded Java program on a cluster of computers. The global object space virtualizes a single Java object heap across machine boundaries to facilitate transparent object accesses. Based on the object connectivity information that is available at runtime, the object reachable from threads at different nodes, named as distributed-shared object, are detected, With the detection of distributed-shared objects, we can alleviate overheads in maintaining the memory consistency within the global object space. Several runtime optimization methods have been incorporated in the global object space design, including an object home migration method that reallocates the home of a distributed-shared object, synchronized method migration that allows the remote execution of a synchronized method at the home node of its synchronized object, and object pushing that uses the object connectivity information to improve access locality.

关键词： Computer science Concurrent computing Information systems Java Object detection parallel processing Protocols Runtime Virtual machining Yarn

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Portable Framework for Real-Time parallel image processing on High Performance Embedded Platforms 23

Portable Framework for Real-Time Parallel Image Processing o...

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23rd Euromicro International conference on parallel, distributed, and Network-Based processing (PDP)

作者： Eisserer, Clemens AIT Austrian Inst Technol GmbH A-2444 Seibersdorf Austria

ISBN: (纸本)9781479984909

The trend to efficient, however more complex, multicore designs has also reached the world of Digital Signal Processors (DSP), a field where typically low-level programming has been prevalent. To overcome the additional complexity of programming multi-core and multi-chip DSP systems, we present an object-oriented framework for task-based parallel programming on the highly power efficient Texas Instruments TSMC320C6678 platform. Our framework incorporates hardware architectural details of this platform such as DMA units in a high-level manner, while maintaining portability - guiding the path for algorithmic designers from PCs to embedded DSP platforms. The whole framework has been designed and implemented with real-time requirements and low overhead in mind, which is crucial for the acceptance of higher-level solutions on embedded systems.

关键词： DSP Embedded Multicore parallel image processing Software Architecture Digital signal processing Desmoplakin Gene Software architecture Platform Frameworks embedded digital signal processor Embedded systems Micro computer Personal computers

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Introducing a Stream processing Framework for Assessing parallel Programming Interfaces 29

Introducing a Stream Processing Framework for Assessing Para...

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29th Euromicro International conference on parallel, distributed and Network-Based processing (PDP)

作者： Garcia, Adriano Marques Griebler, Dalvan Fernandes, Luiz G. L. Schepke, Claudio Pontifical Catholic Univ Rio Grande do Sul PUCRS Sch Technol Porto Alegre RS Brazil Tres de Maio Maio Fac SETREM Lab Adv Res Cloud Comp LARCC Tres De Maio Brazil Fed Univ Pampa UNIPAMPA Alegrete Brazil

ISBN: (纸本)9781665414555

Stream processing applications are spread across different sectors of industry and people's daily lives. The increasing data we produce, such as audio, video, image, and text are demanding quickly and efficiently computation. It can be done through Stream parallelism, which is still a challenging task and most reserved for experts. We introduce a Stream processing framework for asse s s ing parallel Programming Interfaces (PPIs). Our framework targets multi-core architectures and C++ stream processing applications, providing an API that abstracts the details of the stream operators of these applications. Therefore, users can easily identify all the basic operators and implement parallelism through different PPIs. In this paper, we present the proposed framework, implement three applications using its API, and show how it works, by using it to parallelize and evaluate the applications with the PPIs Intel TBB, FastFlow, and SPar. The performance results were consistent with the literature.

关键词： Benchmark Framework parallel Programming Stream processing

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image thresholding computation of between-class variance in a partial parallel structure

Image thresholding computation of between-class variance in ...

引用

IECON 2006 - 32nd Annual conference on IEEE Industrial Electronics

作者： Lin, Ku Chin Lin, Yi-Hong Department of Mechanical Engineering Kun Shan University Taiwan Department of Mechanical Engineering National Pingtung University of Science and Technology Taiwan

ISBN: (纸本)1424401364

parallel processing of thresholding based on image between-class variance (BCV) is studied in this paper. In parallel processing, a frame of image is divided into M sub-images with the same size. Computation of the normalized probability and moments of image is distributed to each of the PCs. However, the rest of the computation in the BCV-based algorithm is non-parallel in essence. Hence, partial parallel processing structures are proposed in this study. Computer time required for parallel and non-parallel thresholding algorithms is compared on a working platform. Most of computer time is used for computing the image normalized probability. It is effective to distribute such computational efforts to multiple processors to promote the processing speed. Unfortunately, transmission of data among the processors takes dominant computer time. It induces a limitation on the processing speed of the distributed system. Conclusions drawn from this study show that 50% of the computer time the BCV-based algorithm takes can be reduced by using 4 processors in a proposed parallel structure. © 2006 IEEE.

关键词： image processing

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distributed image edge detection methods and performance

Distributed image edge detection methods and performance

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Proceeedings of the 6th IEEE Symposium on parallel and distributed processing

作者： Zhang, Xiaodong Deng, Hong Univ of Texas at San Antonio San Antonio United States

An edge detection process in computer vision and image processing detects any types of significant features appearing as discontinuities in intensities. This paper presents our experience with parallelizing an edge detection application algorithm that reduces noise and unnecessary detail in a gray-scale image from a coarse level to a fine level of resolution by using an edge focusing technique. Numerical methods and parallel implementations of edge focusing are presented. The image detection algorithms are implemented on three representative massage-passing architectures: a low-cost heterogeneous PVM network, an Intel iPSC/860 hypercube, and a CM-5 massively parallel multicomputer. Our objectives are to provide insight into implementation and performance issues for image processing applications on general-purpose message-passing architectures, to investigate implications on network variations, and to evaluate the computing scalabilities on the three network systems by examining execution and communication patterns of the image edge detection application.

关键词： Edge detection

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Challenges in URL switching for implementing globally distributed web sites

Challenges in URL switching for implementing globally distri...

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International conference on parallel processing (ICPP 2000)

作者： Genova, Z Christensen, KJ Univ S Florida Dept Comp Sci & Engn Tampa FL 33620 USA

ISBN: (纸本)0769507719

URL, or layer-5, switches can be used to implement locally and globally distributed web sires. URL switches must be able to exploit knowledge of server load and content (e.g., of reverse caches). Implementing globally distributed web sites offers difficulties not present in local server clusters due to bandwidth and delay constraints in the Internet. With delayed load information, server selection methods based on choosing the least-loaded server will result in oscillations in network and server load. In this paper, methods that make effective use of delayed load information are described and evaluated The new Pick-KX method is developed and shown to be better than existing methods. Load information is adjusted with probabilistic information using Bloom filter summaries of site content A combined loan and content metric is suggested for use for selecting the best server in a globally distributed site.

关键词： Websites

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Numerical simulation of a difference scheme applied in image processing based on four-order PDEs

Numerical simulation of a difference scheme applied in image...

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8th ACIS International conference on Software Engineering, Artificial Intelligence, Networking and parallel/distributed Computing/3rd ACIS International Workshop on Self-Assembling Wireless Networks

作者： Zhang, Lijie Liu, Hui Wang, Yan Qingdao Technol Univ Sch Sci Shandong 266033 Peoples R China

A difference scheme for noise removal based on four-order partial differential equations is suggested. It can approximate actual image while preserving edges and avoiding blocky effects in image processing. Numerical ... 详细信息

ISBN: (纸本)0769529097

关键词： Noise abatement

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A Fast Wavelet Packet Transform-based algorithm for numerical solution of image restoration problems in a parallel environment

A Fast Wavelet Packet Transform-based algorithm for numerica...

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conference on Wavelet Applications in Signal and image processing VI

作者： Carracciuolo, L D'Amore, L Murli, A Univ Naples Federico II Naples Italy

ISBN: (纸本)0819429139

We explore the filtering properties of wavelets functions in order to develop accurate and efficient numerical algorithms for image Restoration problems. We propose a parallel implementation for MIMD distributed memory environments. The key insight of our approach is the use of distributed versions of Level 3 Basic Linear Algebra Subprograms as computational building blocks and the use of Basic Linear Algebra Communication Subprograms las communication building blocks for advanced architecture computers. The use of these low-level mathematical software libraries garantees the development of efficient, portable and scalable high-level algorithms and hides many details of the parallelism from the user's point of view. Numerical experiments on a simulated image restoration applications are shown. The parallel software has been tested on a 12 nodes IBM SP2 available at the Center for Research on parallel Computing and Supercomputers in Naples (Italy).

关键词： image Restoration preconditioning regularization wavelets parallel implementation distributed memory architecture

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