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

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Conservative synchronization in object-oriented parallel battlefield discrete event simulations 97

Conservative synchronization in object-oriented parallel bat...

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proceedings of the eleventh workshop on parallel and distributed simulation

作者： James B. Hiller Thomas C. Hartrum Department of Electrical and Computer Engineering School of Engineering Air Force Institute of Technology Wright-Patterson AFB OH

ISBN: (纸本)9780818679650

We present a conservative strategy for spatially decomposed parallel discrete event battlefield simulation. The traditional null message algorithm provides a foundation from which a mapping to generic simulation attributes can be made. We informally discuss preservation of logical correctness and freedom from deadlock. Experimental results demonstrate the potential execution time savings when load imbalance is not dominant; more importantly, they highlight improvement opportunities in spite of potential load imbalance. The net result is that a very reasonable performance gain can be delivered for little effort in a way that supports good simulation system design principles. The approach is straightforward and can be easily implemented as part of a more general sequential or parallel simulation support environment. While the approach is expressed in terms of battlefield simulation, its essence applies to many simulation applications.

关键词： null message algorithm load imbalance conservative synchronization military computing spatially decomposed simulation simulation system design deadlock generic simulation attributes execution time savings parallel battlefield discrete event simulations logical correctness performance gain object-oriented simulation

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A case study in simulating PCS networks using Time Warp 95

A case study in simulating PCS networks using Time Warp

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proceedings of the ninth workshop on parallel and distributed simulation

作者： Christopher D. Carothers Richard M. Fujimoto Yi-Bing Lin College of Computing Georgia Institute of Technology Atlanta Georgia Bellcore Morristown New Jersey

ISBN: (纸本)9780818671203

There has been rapid growth in the demand for mobile communications over the past few years. This has led to intensive research and development efforts for complex PCS (personal communication service) networks. Capacity planning and performance modeling is necessary to maintain a high quality of service to the mobile subscriber while minimizing cost to the PCS provider. The need for flexible analysis tools and the high computational requirements of large PCS network simulations make it an excellent candidate for parallel ***, we describe our experiences in developing two PCS simulation models on a general purpose distributed simulation platform based on the Time Warp mechanism. These models utilize two widely used approaches to simulating PCS networks: (i) the call-initiated and (ii) the portable-initiated models. We discuss design decisions that were made in mapping these models to the Time Warp executive, and characterize the workloads resulting from these models in terms of factors such as communication locality and computation granularity. We then present performance measurements for their execution on a network of workstations. These measurements indicate that the call-initiated model generally outperforms the portable initiated model, but is not able to capture phenomenon such as the “busy line” effect. Moreover, these studies indicate that the high locality in large-scale PCS network simulations make them well-suited for execution on general purpose parallel and distributed simulation platforms.

关键词： time warp discrete event simulation performance measurements flexible analysis tools personal communication service telecommunication computing PCS networks parallel distributed mobile communications simulation platforms time warp simulation mobile communication

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Estimating the cost of throttled execution in time warp 96

Estimating the cost of throttled execution in time warp

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proceedings of the tenth workshop on parallel and distributed simulation

作者： Samir R. Das Division of Computer Science The University of Texas at San Antonio San Antonio TX

ISBN: (纸本)9780818675393

Over-optimistic execution has long been identified as a major performance bottleneck in Time Warp based parallel simulation systems. An appropriate throttle or control of optimism can improve performance by reducing the number of rollbacks. However, the design of an appropriate throttle is a difficult task, as correct computations on the critical path may be blocked, thus increasing the overall execution time. In this paper we build a cost model for throttled execution that involves both rollback probability and probability for an event computation being on the critical path. The model can estimate an appropriate size of time window for a throttled execution using statistics collected from the purely optimistic execution. The model is validated by an experimental study with a set of synthetic workloads.

关键词： time warp discrete event simulation performance model parallel simulation

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Stack-free process-oriented simulation 97

Stack-free process-oriented simulation

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proceedings of the eleventh workshop on parallel and distributed simulation

作者： C. J. M. Booth D. I. Bruce Defence Evaluation and Research Agency St. Andrews Road Malvern WORCS WR14 3PS UK

ISBN: (纸本)9780818679650

The process interaction world view is widely used in the general simulation community for its expressive power, and is supported by most modern simulation languages. In parallel discrete event simulation, however, its use remains comparatively rare due to the perceived inefficiency (and difficulty) of parallel *** present a new implementation strategy for parallel process-oriented simulation languages. This innovative, semantics-based approach directly addresses two common concerns of such languages. By concentrating on the intrinsic threads of control, we avoid the proliferation of simulation objects (and their associated costs) that might result from a naive translation. More fundamentally, the primary costs associated with process-oriented languages -- those of context switching between stacks and, in an optimistic setting, of saving the state of these stacks -- are entirely eliminated since our explicit use of continuations avoids the need for stacks in the first place. We similarly obtain cheap and natural thread preemption.

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A simulation environment for ad hoc networks using sector subdivision

A simulation environment for ad hoc networks using sector su...

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Euromicro Conference on parallel, distributed and Network-Based Processing

作者： K. Volbert Heinz Nixdorf Institute and Department of Mathematics and Computer Science University of Paderborn Germany

ISBN: (纸本)0769514448

A new model for communication in MANET is presented: Instead of omnidirectional transmissions, as assumed in most papers and all existing systems, the members are allowed to submit data in a fixed number of different directions (sector subdivision) and to adjust the transmission power in each sector separately. A simulation environment (simulation environment for ad hoc networks, SAHNE) is presented that allows simulation of communication strategies in MANET that use sector subdivision, and simulation results are shown where communication paths are selected via hop-minimization or geometric spanner properties. SAHNE is based on C++ and common libraries, which ensures that it can be used on many different platforms. The experiments show the influence of different parameters in realistic scenarios, and using geometric routing seemed to be better than using hop-minimization.

关键词： Ad hoc networks Mobile communication Solid modeling Mobile ad hoc networks Routing protocols Frequency Batteries Prototypes Computational modeling Mathematics

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parallel image analysis on recursive Torus architecture

Parallel image analysis on recursive Torus architecture

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1993 Computer Architectures for Machine Perception, CAMP 1993

作者： Matsuyama, T. Asada, N. Aoyama, M. Department of Information Technology Okayama University Okayama700 Japan

ISBN: (纸本)0818654201

The authors describe a new parallel image understanding machine RTA/1 design based on the recursive Torus architecture, and proposed a data level parallel processing scheme using parallel data structures. Various types of parallel image analysis algorithms were developed to demonstrate the effectiveness of both RTA/1 and the parallel data structures. The performance of all algorithms were evaluated by simulation and it was shown that about two order of magnitude speed-up can be attained by using 32 × 32 PE tours. The five types of parallel data structures described here are only fundamental ones and one needs to explore new distributed data representations and coordinated communication procedures to increase the flexibility, utility, and efficiency of the parallel processing on RTA/1. The Pascal like notation used to describe the parallel data structures and algorithms is to be improved to a complete parallel programming language. However the development of the parallel programming language should follow the investigation of the control level parallel processing on RTA/1, since parallel image understanding systems require both data and control level parallel processing capabilities. © 1993 IEEE.

关键词： Image analysis

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An algorithm for speculative parallel execution of rendezvous-synchronized simulation 95

An algorithm for speculative parallel execution of rendezvou...

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proceedings of the ninth workshop on parallel and distributed simulation

作者： Bruno R. Preiss Department of Electrical and Computer Engineering University of Waterloo Waterloo Ontario Canada N2L 3G1

ISBN: (纸本)9780818671203

This paper presents an approach for speculative parallel execution of rendezvous-synchronized simulations. Rendezvous-synchronized simulation is based on the notions of processes and gates and on the rendezvous mechanism defined in the basic process algebra of LOTOS—a standard formal specification language for temporal ordering[2]. Time is introduced via a mechanism similar to the delay behaviour annotation provided by the TOPO toolset[4-6].The algorithm allows speculative gate activations. This increases the available parallelism while ensuring correct execution of the *** model is used to describe closed stochastic queueing network simulations. Analysis of their execution results suggests that the model makes available a promising degree of parallelism.

关键词： temporal ordering rendezvous-synchronized simulation TOPO toolset delay behaviour annotation speculative gate activations LOTOS parallel algorithms formal specification closed stochastic queueing network simulations digital simulation stochastic processes queueing theory formal specification language specification languages speculative parallel execution process algebra

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Time Warp Cancellation Optimisations on High Latency Networks 03

Time Warp Cancellation Optimisations on High Latency Network...

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proceedings of the seventh IEEE International Symposium on distributed simulation and Real-Time Applications

作者： K. A. Iskra G. D. van Albada P. M. A. Sloot

ISBN: (纸本)9780769520360

We investigate the performance of the Time Warp kernel APSIS when running on various communication layers, in particular on a wide-area Grid. Several cancellation strategies are tried, among them the lazy cancellation and a little known bulk anti-messages optimisation. Our experiments with an Ising spin simulation indicate that the slowdown caused by high latency networks, while ***, is not catastrophic, and that it can be significantly reduced using the lazy cancellation. Experiments suggest that further improvements can be expected if a more elaborate communication infrastructure is put in place.

关键词： lazy cancellation high latency networks bulk anti-messages Time Warp parallel discrete event simulation Grid

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The preliminary evaluation of MBP-light with two protocol policies for a massively parallel processor-JUMP-1

The preliminary evaluation of MBP-light with two protocol po...

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Frontiers of Massively parallel Computation

作者： I. Hiroaki K. Anjo J. Yamamoto J. Tanabe M. Wakabayashi M. Sato H. Amano K. Hiraki Keio University Yokohama Kanagawa Japan Real World Computing Partnership Yokohama Kanagawa Japan Fujitsu Laboratories Limited Yokohama Kanagawa Japan University of Tokyo Yokohama Kanagawa Japan

A massively parallel processor called JUMP-1 has been developed to build an efficient cache coherent-distributed shared memory (DSM) on a large system with more than 1000 processors. Here, the dedicated processor called MBP (Memory Based Processor)-light to manage the DSM of JUMP-1 is introduced, and its preliminary performance with two protocol policies-update/invalidate-is evaluated. From results of its simulation, it appears that simple operations like the tag check and the collection/generation of acknowledgment packets are mostly processed by the hardware mechanisms in MBP-light without the aids of the core processor with both policies. Also, the buffer-register architecture adopted by the core processor in MBP-light is exploited enough to process a protocol transaction for both policies.

关键词： Access protocols Reduced instruction set computing Memory management Hardware Concurrent computing Laboratories Electronic mail AC generators System performance Prototypes

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A static partitioning and mapping algorithm for conservative parallel simulations 94

A static partitioning and mapping algorithm for conservative...

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proceedings of the eighth workshop on parallel and distributed simulation

作者： Azzedine Boukerche Carl Tropper School of Computer Science McGill University Montreal Canada

ISBN: (纸本)9781565550278

In this paper, we consider the problem of partitioning a conservative parallel simulation for execution on a multi-computer. The synchronization protocol makes use of null messages [6]. We propose the use of a simulated annealing algorithm with an adaptive search schedule to find good (sub-optimal) partitions. The paper discusses the algorithm, its implementation and reports on the performance results of simulations of a partitioned FCFS queueing network model executed on iPSC/860 hypercube. The results obtained are compared with a random partitioning. They show that a partitioning which makes use of our simulated annealing algorithm results in a reduction of 25-35% of the running time of the simulations when compared to the running time of a random partition of the model.

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