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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...

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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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Eurographics Symposium on parallel Graphics and Visualization, EGPGV 2006

Eurographics Symposium on Parallel Graphics and Visualizatio...

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6th Eurographics Symposium on parallel Graphics and Visualization, EGPGV 2006

ISBN: (纸本)3905673401

The proceedings contain 20 papers. The topics discussed include: rendering on demand;an application of scalable massive model interaction using shared-memory systems;accelerating the irradiance cache through parallel component-based rendering;parallel simulation of cloth on distributed memory architectures;dynamic load balancing for parallel volume rendering;interactive volume rendering of unstructured grids with time-varying scalar fields;optimized volume raycasting for graphics-hardware-based cluster systems;accelerated volume rendering with homogeneous region encoding using extended anisotropic chessboard distance on GPU;parallel texture-based vector field visualization on curved surfaces using GPU cluster computers;and distributed force-directed graph layout and visualization.

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Model checking suspendible business processes via statechart diagrams and CSP

Model checking suspendible business processes via statechart...

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4th International workshop on Modelling, simulation, Verification and Validation of Enterprise Information Systems, MSVVEIS 2006 - In Conjunction with ICEIS 2006

作者： Yeung, W.L. Leung, K.R.P.H. Wang, Ji Dong, Wei Lingnan University Hong Kong Hong Kong Hong Kong Institute of Vocational Education Hong Kong Hong Kong National Laboratory for Parallel and Distributed Processing Changsha Hunan China

ISBN: (纸本)9789728865498

When using statechart diagrams, the history mechanism can be useful for modelling the suspension of a "normal" business process upon certain "abnormal" events together with the subsequent resumption, as illustrated by the examples in this paper. However, previous approaches to model checking statechart diagrams often ignore the history mechanism. We enhanced such a previous approach based on Communicating Sequential Processes (CSP) and developed a support tool for it.

关键词： Model checking

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A generic symbiotic simulation framework 06

A generic symbiotic simulation framework

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

作者： Shell, Ying Huang Wentong, Cai JohnTurner, Stephen Hsu, Wen Jing Suiping, Zhou Low, Malcolm Yoke Hean Fujimoto, Richard Ayani, Rassul Nanyang Technological University Singapore Singapore Singapore Institute of Manufacturing Technology Singapore Singapore Georgia Institute of Technology United States Royal Institute of Technology Sweden

ISBN: (纸本)0769525873

A symbiotic or online simulation is defined as one that interacts with the physical system in a mutually beneficial way. The simulation is driven by real time data collected from a physical system under control and needs to meet the real-time requirements of the physical system. In turn, the results from the "what-if experiments performed by the simulator can be used to control the dynamic behaviour of the physical system. Such a simulation tool is for real-time planning and is to foresee and advise on real time problems. It aims to improve performance, to adapt to sudden and unexpected events and to improve aspects of safety and security of the physical system. There are some research efforts, for example, the Dynamic Data-Driven Application Systems (DDDAS) which are currently advocated by the National Science Foundation (NSF) of the United States. However, work in this area is far from complete and many of the research issues are not fully addressed. We see the need for a general framework for symbiotic simulation. In this project, simulators based on the same general framework will be developed using symbiotic simulation techniques and will be used to provide adaptive decision support to manage the resources in several application environments. The objectives of this project are: To develop a generic, agent-based, symbiotic simulation system architecture. To develop mechanisms to support dynamic coupling between the symbiotic simulation system and the physical system. To conduct pilot case studies of the simulation framework. To explore and evaluate the service oriented architecture approach for parallel simulation in the multi-agent symbiotic simulation framework. © 2006 IEEE.

关键词： Online systems

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Embedded Computer Systems: Architectures, Modeling, and simulation - 6th International workshop, SAMOS 2006, proceedings

Embedded Computer Systems: Architectures, Modeling, and Simu...

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6th International workshop on Architectures, Modeling, and simulation, SAMOS 2006

ISBN: (纸本)3540364102

The proceedings contain 48 papers. The topics discussed include: reconfigurable platform for digital convergence terminals;European research in embedded systems;interface overheads in embedded multimedia software;automated distribution of UML 2.0 designed applications to a configurable multiprocessor platform;key research challenges for successfully applying MDD within real-time embedded software development;domain-specific modeling of power aware distributed real-time embedded systems;mining dynamic document spaces with massively parallel embedded processors;designing wireless sensor nodes;design, implementation, and experiment on outdoor deployment of wireless sensor network for environmental monitoring;energy-driven partitioning of signal processing algorithms in sensor networks;security in wireless sensor networks: considerations and experiments;on security of PAN wireless systems;and code size reduction by compiler tuning.

关键词： Computer systems

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Hoarding location-based data using clustering

Hoarding location-based data using clustering

引用

MobiWAC 2006 - 2006 ACM International workshop on Mobility Management and Wireless Access

作者： Bürklen, Susanne Marrón, Pedro José Rothermel, Kurt Pfahl, Timo Institute of Parallel and Distributed Systems Universitaet Stuttgart 70569 Stuttgart Germany

ISBN: (纸本)159593488X

The proliferation of mobile devices and the fact that high-bandwidth and continuous connectivity is not available everywhere, has led to the creation of hoarding algorithms that attempt to mitigate the problems related with disconnected operation and with the operation in areas where bandwidth is either scarce or expensive. In this paper, we present a hoarding scheme for location-based data in semi-structured information spaces, such as the World Wide Web, which relies on clustering of semantically related data items. We show by means of experimental evaluation that our clustering-based approach outperforms existing hoarding techniques that do not make use of clustering by a factor of more than 2 in terms of hoard cache hit ratio. Copyright 2006 ACM.

关键词： Cluster analysis

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City@home: Monte Carlo derivative pricing distributed on networked computers 1

City@home: Monte Carlo derivative pricing distributed on net...

引用

1st International workshop on Grid Technology for Financial Modeling and simulation, GRID 2006

作者： Germano, Guido Engel, Michael Scalas, Enrico Computer Simulation Group Department of Chemistry Philipps University Marburg Marburg35032 Germany Distributed Systems Group Department of Mathematics and Computer Science Philipps University Marburg Marburg35032 Germany Department of Advanced Sciences and Technologies Amedeo Avogadro University of East Piedmont Via Bellini 25 G Alessandria15100 Italy

Monte Carlo is a powerful and versatile derivative pricing tool, with the main drawback of requiring a large amount of computing time to generate enough realisations of the stochastic process. However, since realisations are independent from each other, the task is "embarassingly" parallel and the workload can be easily distributed on a large set of processors without the need for fast networking and thus an expensive dedicated supercomputer. Such an alternative, much cheaper and more accessible way can be realised with the BOINC toolkit, distributing the Monte Carlo runs on networked clients running under Windows, Linux or various Unix variants, and recollecting the results at the end for a statistical evaluation of the price distribution at the final time. Though it is likely that the clients will belong to the intranet of a large company or institution, we gave our program the evocative name City@home in honour of the paradigmatic SETI@home project. As an application, we present the generation of synthetic high frequency financial time series for speculative option valuation in the context of uncoupled continuous-time random walks (fractional diffusion), with a Lévy marginal density function for the tick-by-tick log returns and a Mittag-Leffler marginal density function for the waiting times. Lévy deviates are generated with the Chambers-Mallows-Stuck method, Mittag-Leffler deviates with the Kozubowski-Pakes method. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.

关键词： Supercomputers

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Concurrent replication of parallel and distributed simulations 05

Concurrent replication of parallel and distributed simulatio...

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19th workshop on Principles of Advanced and distributed simulation (PADS 2005)

作者： Bononi, L Bracuto, M D'Angelo, G Donatiello, L Univ Bologna Dipartimento Sci Informaz I-40126 Bologna Italy

ISBN: (纸本)0769523838

parallel and distributed simulations enable the analysis of complex systems by concurrently exploiting the aggregate computation power and memory of clusters of execution units. In this paper we investigate a new direction for increasing both the speedup of a simulation process and the utilization Of computation and communication resources. Many simulation-based investigations require to collect independent observations for a correct and significant statistical analysis of results. The execution of many independent parallel or distributed simulation runs may suffer the speedup reduction due to rollbacks under the optimistic approach, and due to idle CPU times originated by synchronization and communication bottlenecks under the conservative approach. We present a parallel and distributed simulation framework supporting Concurrent Replication of parallel and distributed simulations (CR-PADS), as an alternative to the execution of a linear sequence of multiple parallel or distributed simulation runs. Results obtained from tests executed under variable scenarios show that speedup and resource utilization gains could be obtained by adopting the proposed replication approach in addition to the pure parallel and distributed simulation.

关键词： Computational modeling Concurrent computing Analytical models distributed computing Design optimization Computer architecture Discrete event simulation Aggregates Statistical analysis Testing

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