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

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Efficient distributed simulation of a communication switch with bursty sources and losses 00

Efficient distributed simulation of a communication switch w...

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proceedings of the fourteenth workshop on parallel and distributed simulation

作者： A. S. McGough I. Mitrani Computing Science Department University of Newcastle Newcastle upon Tyne NE1 7RU

ISBN: (纸本)9780769506678

Algorithms for simulating an ATM switch on a distributed memory multiprocessor are described. These include parallel generation of bursty arrival streams, along with the marking and deleting of lost cells due to buffer overflows. These algorithms increase the amount of computation carried out independently by each processor, and reduce the communication between the processors. When the number of cells lost is relatively small, the run time of the simulation is approximately O(N/P), where N is the total number of cells simulated and P is the number of processors. The cells are processed in intervals of fixed length; that length affects the structure and the performance of the algorithms.

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Model structure and load balancing in optimistic parallel discrete event simulation 00

Model structure and load balancing in optimistic parallel di...

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proceedings of the fourteenth workshop on parallel and distributed simulation

作者： Tapas K. Som Robert G. Sargent IBM and Simulation Research Group Department of Electrical Engineering and Computer Science Syracuse University Syracuse NY Simulation Research Group Department of Electrical Engineering and Computer Science Syracuse University Syracuse NY

ISBN: (纸本)9780769506678

The concept of strong groups is introduced to describe the structure of simulation models. It is shown that logical processes within strong groups process at approximately the same rate and that different strong groups can progress at different rates. An algorithm based on the rates of the strong groups is presented to balance the load among the physical processors and for flow control.

关键词： flow control simulation model structure parallel simulation load balancing optimistic protocols

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distributed, parallel simulation of multiple, deliberative agents 00

Distributed, parallel simulation of multiple, deliberative a...

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proceedings of the fourteenth workshop on parallel and distributed simulation

作者： A. M. Uhrmacher K. Gugler Department of Computer Science Universität Ulm D-89069 Ulm Germany

ISBN: (纸本)9780769506678

Multi-agent systems comprise multiple, deliberative agents embedded in and recreating patterns of interactions. Each agent's execution consumes considerable storage and calculation capacities. For testing multi-agent systems, distributed parallel simulation techniques are required that take the dynamic pattern of composition and interaction of multi-agent systems into account. Analyzing the behavior of agents in virtual, dynamic environments necessitates relating the simulation time to the actual execution time of agents. Since the execution time of deliberative components can hardly be foretold, conservative techniques based on lookahead are not applicable. On the other hand, optimistic techniques become very expensive if mobile agents and the creation and deletion of model components are affected by a rollback. The developed simulation layer of JAMES (a Java Based Agent Modeling Environment for simulation) implements a moderately optimistic strategy which splits simulation and external deliberation into different threads and allows simulation and deliberation to proceed concurrently by utilizing simulation events as synchronization points.

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Applying parallel discrete event simulation to network emulation 00

Applying parallel discrete event simulation to network emula...

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proceedings of the fourteenth workshop on parallel and distributed simulation

作者： Rob Simmonds Russell Bradford Brian Unger University of Calgary Canada University of Bath UK

ISBN: (纸本)9780769506678

The simulation of wide area computer networks is one area where the benefits of parallel simulation have been clearly demonstrated. Here we present a description of a system that uses a parallel discrete event simulator to act as a high speed network emulator. With this, real Internet Protocol (IP) traffic generated by application programs running on user workstations can interact with modelled traffic in the emulator, thus providing a controlled test environment for distributed *** network emulator uses the TasKit conservative parallel discrete event simulation (PDES) kernel. TasKit has been shown to be able to achieve improved parallel performance over existing conservative and optimistic PDES kernels, as well as improved sequential performance over an existing central-event-list based kernel. This paper explains the modifications that have been made to TasKit to enable real-time operation along with the emulator interface that allows the IP network simulation running in the TasKit kernel to interact with real IP clients. Initial emulator performance data is included.

关键词： critical channel traversing real-time simulation Internet protocol (IP) parallel discrete event simulation (PDES) computer network emulation conservative protocol

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Strategies for success in parallel simulation applications (keynote speech) 00

Strategies for success in parallel simulation applications (...

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proceedings of the fourteenth workshop on parallel and distributed simulation

作者： Frederick Wieland The MITRE Corporation Center for Advanced Aviation Systems Development McLean VA

ISBN: (纸本)9780769506678

While the PADS community has traditionally focused on—and done a greater job with—the technical aspects of developing simulations that run fast and can be connected to other simulations, it has paid little or no attention to the overall strategies required to produce a marketable, useful, and successful parallel simulation. This lack of market focus has led to many fears of the demise of the PADS community, complaints of its lack of general acceptance by the broader simulation community, and predictions that it will become merely another venue for simulation *** fears, complaints, and predictions are unnecessary. There are several examples of successful parallel simulations—in domains as far apart as aviation modeling and wargames. What can we learn from their successes? How can we translate their general acceptance into other parallel simulation domains? Are there market opportunities that we are missing? In short, what is the parallel simulation community lacking, and what does it need to do in order to be more successful?The purpose of this talk is to begin a discussion on the answers to these questions (as opposed to definitively answering them). We will draw on numerous examples of successful applications, and make some concrete suggestions for furthering the community.

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Optimizing cell-size in grid-based DDM 00

Optimizing cell-size in grid-based DDM

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proceedings of the fourteenth workshop on parallel and distributed simulation

作者： Rassul Ayani Farshad Moradi Gary Tan School of Computing National University of Singapore Singapore 119260

ISBN: (纸本)9780769506678

In a large-scale distributed simulation with thousands of dynamic objects, efficient communication of data among these objects is an important issue. The broadcasting mechanism specified by the distributed Interactive simulation (DIS) standards is not suitable for large scale distributed *** the High Level Architecture (HLA) paradigm, the Runtime Infrastructure (RTI) provides a set of services, such as data distribution management (DDM) among federates. The goal of the DDM module in RTI is to make the data communication more efficient by sending the data only to those federates that need the data, as opposed to the broadcasting mechanism employed by *** DDM schemes have appeared in the literature. In this paper, we discuss grid-based DDM and develop a DDM model that uses grids for matching the publishing/subscription regions, and for data filtering. We show that appropriate choice of the grid-cell size is crucial in obtaining good performance. We develop an analytical model and derive a formula for identifying the optimal cell size in grid-based DDM.

关键词： HLA group communication distributed simulation data filtering data communication

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parallel mixed-technology simulation 00

Parallel mixed-technology simulation

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proceedings of the fourteenth workshop on parallel and distributed simulation

作者： Peter Frey Radharamanan Radhakrishnan Cadence Design Systems 2655 Seely Avenue San Jose CA Dept. of ECECS University of Cincinnati Cincinnati OH

ISBN: (纸本)9780769506678

Circuit simulation has proven to be one of the most important computer aided design (CAD) methods for the analysis and validation of integrated circuit designs. A popular approach to describing circuits for simulation purposes is to use a hardware description language such as VHDL. Similar efforts have also been carried out in the analog domain that has led to tools such as SPICE. However, with the growing trend of hardware designs that contain both analog and digital components, design environments that seamlessly integrate analog and digital circuitry are needed. simulation of such circuit is however, exacerbated by the higher resource (CPU and memory) demands that arise when analog and digital models are integrated in a mixed-mode (analog and digital) simulation. One solution to this problem is to use PDES algorithms on a distributed platform. However, a synchronization interface between the analog and digital simulation environment is required to achieve integrated mixed-mode simulation. In this paper, we present the issues involved in the construction of synchronization protocols which support mixed-mode simulation in a distributed simulation environment. The proposed synchronization protocols provide an interface between an optimistic (Time Warp based) discrete-event simulation kernel and any continuous time simulation kernel. Empirical and formal analyses were conducted to ensure correctness and completeness of the protocols and the results of these analyses are also presented.

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parallelizing a sequential logic simulator using an optimistic framework based on a global parallel heap event queue: an experience and performance report 00

Parallelizing a sequential logic simulator using an optimist...

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proceedings of the fourteenth workshop on parallel and distributed simulation

作者： Sushil K. Prasad Nikhil Junankar Computer Science Department Georgia State University Atlanta

ISBN: (纸本)9780769506678

We have parallelized the Iowa Logic Simulator, a gate-level fine-grained discrete-event simulator, by employing an optimistic algorithm framework based on a global event queue implemented as a parallel heap. The original code and the basic data structures of the serial simulator remained unchanged. Wrapper data structures for the logical processes (gates) and the events are created to allow rollbacks, all the earliest events at each logical processes are stored into the parallel heap, and multiple earliest events are simulated repeatedly by invoking the simulate function of the serial simulator. The parallel heap allowed extraction of hundreds to thousands of earliest events in each queue access. On a bus-based shared-memory multiprocessor, simulation of synthetic circuits with 250,000 gates yielding speedups of 3.3 employing five processors compared to the serial execution time of the Iowa Logic Simulator, and limited the number of rollbacks to within 2,000. The basic steps of parallelization are well-defined and general enough to be employable on other discrete-event simulators.

关键词： parallel heap parallel discrete event simulation parallelizing framework logic simulation

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Load balancing for conservative simulation on shared memory multiprocessor systems 00

Load balancing for conservative simulation on shared memory ...

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proceedings of the fourteenth workshop on parallel and distributed simulation

作者： Boon Ping Gan Yoke Hean Low Sanjay Jain Stephen J. Turner Wentong Cai Wen Jing Hsu Shell Ying Huang Gintic Institute of Manufacturing Technology 71 Nanyang Drive Singapore 638075 School of Applied Science Nanyang Technological University Nanyang Avenue Singapore 639798

ISBN: (纸本)9780769506678

Load balancing is a crucial factor in achieving good performance for parallel discrete event simulations. In this paper, we present a load balancing scheme that combines both static partitioning and dynamic load balancing. The static partitioning scheme maps simulation objects to logical processes before simulation starts while the dynamic load balancing scheme attempt to balance the load during runtime. The static scheme involves two steps. First, the simulation objects that contribute to small lookahead are merged together by using a merging algorithm. Then a partitioning algorithm is applied. The merging is needed to ensure a consistent performance for our dynamic scheme. Our dynamic scheme is tailor-made for an asynchronous simulation protocol that does not rely on null messages. The performance study on a supply-chain simulation shows that the partitioning algorithm and dynamic load balancing are important in achieving good performance.

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parallel simulated annealing for the set-partitioning problem

Parallel simulated annealing for the set-partitioning proble...

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Euromicro workshop on parallel and distributed Processing

作者： Z.J. Czech Institute of Computer Science Silesian University of Technology Gliwice Poland

A delivery problem which reduces to the NP-complete set-partitioning problem is investigated. The sequential and parallel simulated annealing algorithms to solve the delivery problem are discussed. The objective is to... 详细信息

关键词： Simulated annealing Helium Vehicles Costs Computational modeling Computer simulation Computer science Postal services Transportation

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