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检索条件"任意字段=Proceedings of the sixteenth workshop on Parallel and distributed simulation"

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proceedings: 20th workshop on Principles of Advanced and distributed simulation

Proceedings: 20th Workshop on Principles of Advanced and Dis...

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20th workshop on Principles of Advanced and distributed simulation, PADS 2006

ISBN: (纸本)0769525873

The proceedings contain 30 papers. The topics discussed include: improving lookahead in parallel multiprocessor simulation using dynamic execution path prediction;the distributed open network emulator: using relativistic time for distributed scalable simulation;performance analysis of shared data access algorithms for distributed simulation of multi-agent systems;predicting performance of resolution changes in parallel simulations;what comes after the semantic web? PADS implications for the dynamic web;discrete-event execution alternatives on general purpose graphical processing units;developing an hierarchical simulator for Beta-binders;greedy algorithms for client assignment in large-scale distributed virtual environments;and interest operators: facilitating attribute interest criteria for formula-based interest management in distributed virtual environments.

关键词： distributed computer systems

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Aurora: An approach to high throughput parallel simulation 06

Aurora: An approach to high throughput parallel simulation

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20th workshop on Principles of Advanced and distributed simulation, PADS 2006

作者： Park, Alfred Fujimoto, Richard M. Computational Science and Engineering Division College of Computing Georgia Institute of Technology Atlanta GA 30332-0280 United States

ISBN: (纸本)0769525873

A master/worker paradigm for executing large-scale parallel discrete event simulation programs over network-enabled computational resources is proposed and evaluated. In contrast to conventional approaches to parallel simulation, a client/server architecture is proposed where clients (workers) repeatedly download state vectors of logical processes and associated message data from a server (master), perform simulation computations locally at the client, and then return the results back to the server. This process offers several potential advantages over conventional parallel discrete event simulation systems, including support for execution over heterogeneous distributed computing platforms, load balancing, efficient execution on shared platforms, easy addition or removal of client machines during program execution, simpler fault tolerance, and improved portability. A prototype implementation called the Aurora parallel and distributed simulation System (Aurora) is described. The structure and interaction of the Aurora components is described. Results of an experimental performance evaluation are presented detailing primitive timings and application performance on both dedicated and shared computing platforms. © 2006 IEEE.

关键词： parallel processing systems

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Improving lookahead in parallel multiprocessor simulation using dynamic execution path prediction 06

Improving lookahead in parallel multiprocessor simulation us...

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20th workshop on Principles of Advanced and distributed simulation, PADS 2006

作者： Chung, Moo-Kyoung Kyung, Chong-Min Dynalith Systems Co. Ltd. CHiPS KAIST Daejeon Korea Republic of Department of EECS CHiPS KAIST Daejeon Korea Republic of

ISBN: (纸本)0769525873

simulation performance is dominated by lookahead in null message-based conservative time management of parallel discrete event simulation (PDES). This paper proposes a scheme for software execution path prediction to extend lookahead in parallel multiprocessor simulation. Templates for predicting program execution path are generated by software analysis, then, a processor model gets lookaheads by evaluating the templates at simulation time. We reduced the amount of null messages by a factor of 10 to 50 in parallel simulation with eight clustered workstations and, as a result, achieved a speedup factor of 4 to 7 compared to a conventional method having constant lookahead. © 2006 IEEE.

关键词： Program processors

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Progressive time-parallel simulation 06

Progressive time-parallel simulation

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20th workshop on Principles of Advanced and distributed simulation, PADS 2006

作者： Kiesling, Tobias Fakultät für Informatik Universität der Bundeswehr München 85577 Neubiberg Germany

ISBN: (纸本)0769525873

parallel simulation techniques are designed to increase simulation model performance by exploiting model concurrency. Unfortunately, designing efficient parallel simulations is not always an easy task. Most existing techniques guarantee results identical to a corresponding sequential simulation. Other methods try to increase efficiency by relaxing causal constraints, leading to the calculation of approximate results. This work proposes to combine both approaches using the novel technique of progressive time-parallel simulation, where imprecise results are calculated rapidly and improved progressively later on until precise results are known. The user is allowed to cancel this process at any time if the accuracy is satisfying. Progressive time-parallel simulation is a specialized parallelization approach that is not applicable to every kind of simulation model. Possible application areas include simulation-based decision support or simulation-based scheduling and control of manufacturing systems. A successful application of the technique is illustrated with progressive queuing system simulation. © 2006 IEEE.

关键词： parallel processing systems

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Optimal period of workload redistribution for dynamic bulk synchronous computations in heterogeneous computing systems

Optimal period of workload redistribution for dynamic bulk s...

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3rd International workshop on Performance Modelling, Evaluation, and Optimization of parallel and distributed Systems held in Conjunction with the 18th International parallel and distributed Processing Symposium

作者： Li, KQ SUNY Albany Dept Comp Sci New Paltz NY 12561 USA

ISBN: (纸本)0769521320

In dynamic bulk synchronous computations, processors may change their workloads from phase to phase. Such workload change will possibly increase the duration of a phase and the overall parallel execution time. Therefore, it is necessary to redistribute workload at runtime to reduce the parallel time. However, such workload redistribution at runtime can be expensive and the overhead of frequent runtime workload redistribution may exceed the benefit of workload redistribution and balancing. The problem of finding the optimal period of runtime workload redistribution for dynamic bulk synchronous computations is motivated by the combined consideration of parallel execution time and system overhead for workload redistribution and balancing. We develop an analytical method to solve the problem in heterogeneous computing systems. We also demonstrate numerical data of the analytical method and simulation results that verify the analytical data.

关键词： bulk synchronous computation heterogeneous computing system simulation workload redistribution

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SOAr-DSGrid: Service-oriented architecture for distributed simulation on the grid 06

SOAr-DSGrid: Service-oriented architecture for distributed s...

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20th workshop on Principles of Advanced and distributed simulation, PADS 2006

作者： Chen, Xinjun Cai, Wentong Turner, Stephen J. Wang, Yong Parallel and Distributed Computing Center School of Computer Engineering Nanyang Technological University Singapore 639798 Singapore

ISBN: (纸本)0769525873

simulation is a low cost alternative to experimentation on real-world physical systems. Grid technology enables coordinated use of and secure access to distributed computing resources and data sources. The service-oriented architecture (SOA) is an ideal paradigm for next generation computing. The loose coupling among services in the SOA relieves service consumers from detailed knowledge of implementation, implementation language, and execution platform of the services to be consumed. In this paper, we propose a framework for developing a component-based distributed simulation and executing the simulation in a service-oriented architecture on the Grid. This framework consists of the schemas for developing simulation components and simulation applications, and underlying base component service modules for constructing a simulation component as a service. The use of component interfaces and schemas enables collaborative development of simulation applications, and the deployment of simulation components as services takes advantage of the SOA (e.g., loose coupling, heterogeneity, and transport neutrality). This paper discusses the motivation for developing such a framework and describes the details of its development. © 2006 IEEE.

关键词： Computer networks

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parallel meshless solver for strongly rotating flows

Parallel meshless solver for strongly rotating flows

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9th International workshop on Separation Phenomena in Liquids and Gases

作者： Mahendra, A. K. Sanyal, A. Gouthaman, G. Bhabha Atom Res Ctr MDD Bombay 400085 Maharashtra India

This paper presents the parallel numerical simulation of 3-D compressible strongly rotating viscous flows by solving Navier-Stokes equations using meshless Least Square Kinetic Upwind Method (LSKUM) solver. The paper describes the LSKUM solver and also addresses the various issues that arise while parallelisation is carried out for LSKUM-NS code for viscous compressible flows using a typical distributed memory architecture. The computational fluid dynamic (CFD) simulation showed a large sized subsonic pocket with a vortex ahead of the stationary body. The parallel meshless CFD code coupled with diffusion and optimization code is capable of solving many viscous rotating flows.

关键词： meshless solver strongly rotating flows. domain decomposition viscous compressible flows

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parallel execution of region-scale evacuation traffic models 06

Parallel execution of region-scale evacuation traffic models

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20th workshop on Principles of Advanced and distributed simulation, PADS 2006

作者： Perumalla, Kalyan S. Oak Ridge National Laboratory United States

ISBN: (纸本)0769525873

simulation-based planning by emergency management agencies for region-scale evacuation scenarios requires fast execution of large vehicular traffic models. The planning problem is characterized by the need to capture micro behaviors of population as well as the far-reaching dependencies inherent in heavily stressed network conditions spanning wide spatial scales. parallel execution is, thus, required to sustain the required detail, size and speed. However, few parallel simulators exist for such applications, partly due to the challenges underlying their development. While most existing simulators are limited in size to a few hundred thousand road segment intersections, region-scale scenarios can involve millions of intersections. Moreover, many simulators are based on time-stepped models, which can be computationally inefficient for the purposes of modeling evacuation traffic. We are addressing the speed and scalability problems using a two-fold approach. First, we are developing discrete event models of vehicular traffic that accommodate complex driver behavior, operation of intersection controllers and complex individual trip patterns. Secondly, we are developing new model partitioning methods and applying parallel discrete event simulation techniques to enable efficient parallel execution on high-performance computing platforms. These are being incorporated into a new parallel simulator of discrete event models of transportation networks, called SCATTER, which we are developing in support of large-scale emergency evacuation scenarios. The end goal of this effort is to greatly exceed the current vehicular simulation capabilities, and enable the simulation at unprecedented scales with millions of intersections and vehicles. © 2006 IEEE.

关键词： Telecommunication traffic

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Predicting performance of resolution changes in parallel simulations 06

Predicting performance of resolution changes in parallel sim...

引用

20th workshop on Principles of Advanced and distributed simulation, PADS 2006

作者： Rao, Dhananjai M. Wilsey, Philip A. CSA Department Miami University Oxford OH - 45056 United States Department of ECECS University of Cincinnati Cincinnati OH 45221-0030 United States

ISBN: (纸本)0769525873

Multi-resolution models can be statically (i.e., before simulation) or dynamically (i.e., during simulation) abstracted to accelerate the simulations without compromising the analysis goals. However, abstractions must be carefully chosen because not all abstractions improve performance. Unfortunately, identifying performance enhancing transformations, particularly in parallel simulations, is a complex task. We have been investigating this bottleneck using a component-based, Time Warp synchronized modeling and simulation environment called WESE in which static and dynamic abstractions are performed using a methodology called Dynamic Component Substitution (DCS). Our ongoing research has resulted in further advances to a novel DCS Performance Prediction Methodology (DCSPPM). DCSPPM combines and compares platform-specific performance characteristics of components via static analysis of the model to predict performance changes due to DCS transformations. This paper presents the enhanced version of DCSPPM and experiments. Empirical evidence obtained using diverse models indicates that DCSPPM provides good estimates (error < 5%) of the performance impacts of DCS transformations. © 2006 IEEE.

关键词： parallel processing systems

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Exploration of distributed shared memory architectures for NoC-based multiprocessors

Exploration of distributed shared memory architectures for N...

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6th International workshop on Embedded Computer Systems - Architectures, Modeling and simulation

作者： Monchiero, Matteo Palermo, Gianluca Silvano, Cristina Villa, Oreste Politecn Milan Dipartimento Elettron & Informaz I-20133 Milan Italy

ISBN: (纸本)1424401550

Multiprocessor system-on-chip (MP-SoC) platforms represent an emerging trend for embedded multimedia applications. To enable MP-SoC platforms, scalable communication-centric interconnect fabrics, such as networks-on-chip (NoC), have been recently proposed. The shared memory represents one of the key elements in designing MP-SoCs, since its function is to provide data exchange and synchronization support. In this paper, a distributed shared memory architecture has been explored, that is suitable for low-power on-chip multiprocessors based on NoC. In particular, the paper focuses on the energy/delay exploration of on-chip physically distributed and logically shared memory address space for MP-SoCs based on a parameterizable NoC. The data allocation on the physically distributed shared memory space is dynamically managed by an on-chip Hardware Memory Management Unit. Experimental results show the impact of different NoC topologies and distributed shared memory configurations for a selected set of parallel benchmark applications from the power/performance perspective.

关键词： Network-on-chip

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