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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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Efficient optimistic parallel simulations using reverse computation 99

Efficient optimistic parallel simulations using reverse comp...

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proceedings of the thirteenth workshop on parallel and distributed simulation

作者： Christopher D. Carothers Kaylan S. Perumalla Richard M. Fujimoto Department of Computer Science Rensselaer Polytechnic Institute 110 8th Street Troy New York College of Computing Georgia Institute of Technology Atlanta GA

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Case study: parallelizing a sequential simulation model 99

Case study: parallelizing a sequential simulation model

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proceedings of the thirteenth workshop on parallel and distributed simulation

作者： Lokesh Bajaj Rajive Bargrodia Richard Meyer Computer Science Department University of California Los Angeles Los Angeles CA

ISBN: (纸本)9780769501550

Most successful examples of parallel simulation models were developed for parallel execution, from the beginning. A number of simulation models are designed only for sequential simulation, even in languages like PARSEC, that support both sequential and parallel simulation algorithms. Converting such simulation models to a form that yields good performance with a parallel implementation can be non-trivial. In this paper we describe a case study showing this conversion process for a simulation model of replicated file systems. The details of the major steps taken in converting the simulation into a parallel simulation are presented: correctness changes; performance changes such as communication topology simplification and lookahead specification; and modeling changes to eliminate performance bottlenecks. The details and performance improvements of each step are presented in this paper.

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Time Warp simulation on clumps 99

Time Warp simulation on clumps

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proceedings of the thirteenth workshop on parallel and distributed simulation

作者： Girindra D. Sharma Radharamanan Radhakrishnan Umesh Kumar V. Rajasekaran Nael Abu-Ghazaleh Philip A. Wilsey Dept. of ECECS University of Cincinnati Cincinnati OH Dept. of Computer Science S.U.N.Y Binghamton NY

ISBN: (纸本)9780769501550

Traditionally, parallel discrete-event simulators based on the Time Warp synchronization protocol have been implemented using either the shared memory programming model or the distributed memory, message passing programming model. This was because the preferred hardware platform was either a shared memory multiprocessor workstation or a network of uniprocessor workstations. However, with the advent of "clumps" (cluster of shared memory multiprocessors), a change in this dichotomous view becomes necessary. This paper explores the design and implementation issues involved in exploiting this new platform for Time Warp simulations. Specifically, this paper presents two generic strategies for implementing Time Warp simulators on clumps. In addition, we present our experiences in implementing these strategies on an extant distributed memory, message passing Time Warp simulator (WARPED). Preliminary performance results comparing the modified clump-specific simulation kernel to the unmodified distributed memory, message passing simulation kernel are also presented.

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Exploiting model independence for parallel PCS network simulation 99

Exploiting model independence for parallel PCS network simul...

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proceedings of the thirteenth workshop on parallel and distributed simulation

作者： Azzedine Boukerche Sajal K. Das Alessandro Fabbri Oktay Yildiz Center for Research in Wireless Computing (CReW) Department of Computer Science University of North Texas Denton TX

ISBN: (纸本)9780769501550

In this paper, we present a parallel simulator (SWiMNet) for PCS networks using a combination of optimistic and conservative paradigms. The proposed methodology exploits event precomputation permitted by model independence within the PCS components. The low percentage of blocked calls is exploited in the channel allocation simulation of precomputed events by means of an optimistic approach. %To illustrate and verify the developed approach, Experiments were conducted with various call arrival rates and mobile host densities on a cluster of Pentium workstations. Performance results indicate that the SWiMNet achieves a speedup of 6 employing 8 workstations, and a speedup of 12 with 16 workstations.

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The high level architecture and beyond: technology challenges 99

The high level architecture and beyond: technology challenge...

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proceedings of the thirteenth workshop on parallel and distributed simulation

作者： Judith S. Dahmann US Defense Modeling and Simulation Office

ISBN: (纸本)9780769501550

The High Level Architecture (HLA) provides the specification of a software architecture for distributed simulation. The baseline definition of the HLA includes the HLA Rules, The HLA Interface Specification, and the HLA Object Model Template. The HLA Rules are a set of 10 basic rules that define the responsibilities and relationships among the components of an HLA federation. The HLA Interface Specification provides a specification of the functional interfaces between HLA federates and the HLA Runtime Infrastructure. The HLA OMT provides a common presentation format for HLA simulation and Federation Object *** HLA was developed over the past three years. It is currently in the process of being applied with simulations developed for analysis, training and test and evaluation and incorporated into industry standards for distributed simulation by both the Object Management Group and the IEEE. This paper provides a discussion of key areas where there are technology challenges in the future implementation and application of the HLA.

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An auto-adaptive dead reckoning algorithm for distributed interactive simulation 99

An auto-adaptive dead reckoning algorithm for distributed in...

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proceedings of the thirteenth workshop on parallel and distributed simulation

作者： Wentong Cai Francis B. S. Lee L. Chen School of Applied Science Nanyang Technological University Nanyang Avenue Singapore 639798

ISBN: (纸本)9780769501550

This paper describes a new, auto-adaptive algorithm for dead reckoning in DIS. In general dead-reckoning algorithms use a fixed threshold to control the extrapolation errors. Since a fixed threshold cannot adequately handle the dynamic relationships between moving entities, a multi-level threshold scheme is proposed. The definition of threshold levels is based on the concepts of area of interest (AOI) and sensitive region (SR), and the levels of threshold are adaptively adjusted based on the relative distance between entities during the simulation. Various experiments were conducted. The results show that the proposed auto-adaptive dead reckoning algorithm can achieve considerable reduction in update packets without sacrificing accuracy in extrapolation.

关键词： Relevance Filtering distributed Interactive simulation (DIS) Area of Interest (AOI) Multi-level Threshold Dead Reckoning Extrapolation Adaptive Algorithm. Sensitive Region (SR)

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Performance prediction tools for parallel discrete-event simulation 99

Performance prediction tools for parallel discrete-event sim...

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proceedings of the thirteenth workshop on parallel and distributed simulation

作者： Chu-Cheow Lim Yoke-Hean Low Boon-Ping Gan Sanjay Jain Wentong Cai Wen Jing Hsu Shell Ying Huang Gintic Institute of Manufacturing Technology 71 Nanyang Drive Singapore 638075 Singapore Centre for Advanced Information Systems School of Applied Science Nanyang Technological University Singapore 639798 Singapore

ISBN: (纸本)9780769501550

We have developed a set of performance prediction tools which help to estimate the achievable speedups from parallelizing a sequential simulation. The tools focus on two important factors in the actual speedup of a parallel simulation program : (a) the simulation protocol used, and (b) the inherent parallelism in the simulation model. The first two tools are a performance/parallelism analyzer for a conservative, asynchronous simulation protocol, and a similar analyzer for a conservative, synchronous ("super-step") protocol. Each analyzer allows us to study how the speedup of a model changes with increasing number of processors, when a specific protocol is used. The third tool -- a critical path analyzer -- gives an ideal upper bound to the model's speedup. This paper gives an overview of the prediction tools, and reports the predictions from applying the tools to a discrete-event wafer fabrication simulation model. The predictions are close to speedups from actual parallel implementations. These tools help us to set realistic expectations of the speedup from a parallel simulation program, and to focus our work on issues which are more likely to yield performance improvement.

关键词： parallel processing discrete event simulation software performance evaluation integrated circuit manufacture performance prediction tools parallel discrete-event simulation sequential simulation parallelization simulation protocol conservative asynchronous simulation conservative synchronous simulation critical path analyzer upper bound wafer fabrication simulation performance improvement

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Combining periodic and probabilistic checkpointing in optimistic simulation 99

Combining periodic and probabilistic checkpointing in optimi...

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proceedings of the thirteenth workshop on parallel and distributed simulation

作者： Francesco Quaglia Dipartimento di Informatica e Sistemistica Università di Roma "La Sapienza" Via Salaria 113 00198 Roma Italy

ISBN: (纸本)9780769501550

This paper presents a checkpointing scheme for optimistic simulation which is a mixed approach between periodic and probabilistic checkpointing. The latter, basing on statistical data collected during the simulation, aims at recording as checkpoints states of a logical process that have high probability to be restored due to rollback (this is done in order to make those states immediately available). The periodic part prevents performance degradation due to state reconstruction (coasting forward) cost whenever the collected statistics do not allow to identify states highly likely to be ***, this scheme can be seen as a highly general solution to tackle the checkpoint problem in optimistic simulation. A performance comparison with previous solutions is carried out through a simulation study of a store-and-forward communication network in a two-dimensional torus topology.

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On event ordering in parallel discrete event simulation 99

On event ordering in parallel discrete event simulation

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proceedings of the thirteenth workshop on parallel and distributed simulation

作者： Robert Rönngren Michael Liljenstam Dept. of Teleinformatics Royal Institute of Technology (KTH) Electrum 204 S-164 40 Kista (Stockholm) Sweden

ISBN: (纸本)9780769501550

Ordering of simultaneous events in DES is an important issue as it has an impact on modelling expressiveness, model correctness as well as causal dependencies. In sequential DES this is a problem which has attracted much attention over the years and most systems provide the user with tools to deal with such issues. This has also attracted some attention within the PDES community and we present an overview of these efforts. We have, however, not yet found a scheme which provides us with the desired functionality. Thus, we present and evaluate some simple schemes to achieve a well defined ordering of events and means to identify both causally dependent and independent events with identical timestamps in the context of optimistic simulations. These schemes should be applicable also to conservative PDES.

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Scheduling critical channels in conservative parallel discrete event simulation 99

Scheduling critical channels in conservative parallel discre...

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proceedings of the thirteenth workshop on parallel and distributed simulation

作者： Z. Xiao B. Unger R. Simmonds J. Cleary Computer Science Dept. University of Calgary Canada Computer Science Dept. University of Waikato New Zealand

ISBN: (纸本)9780769501550

This paper introduces the Critical Channel Traversing (CCT) algorithm, a new scheduling algorithm for both sequential and parallel discrete event simulation. CCT is a general conservative algorithm that is aimed at the simulation of low-granularity network models on shared-memory multi-processor *** implementation of the CCT algorithm within a kernel called TasKit has demonstrated excellent performance for large ATM network simulations when compared to previous sequential, optimistic and conservative kernels. TasKit has achieved two to three times speedup on a single processor with respect to a splay tree central-event-list based sequential kernel. On a 16 processor (R8000) Silicon Graphics PowerChallenge, TasKit has achieved an event-rate of 1.2 million events per second and a speedup of 26 relative to the sequential kernel for a large ATM network *** is achieved through a multi-level scheduling scheme that supports the scheduling of large grains of computation even with low-granularity events. Performance is also enhanced by supporting good cache behavior and automatic load *** paper describes the algorithm and its motivation, proves its correctness and briefly presents performance results for TasKit.

关键词： parallel simulation ATM network modeling time parallelism Chandy-Misra-Bryant algorithm Critical Channel Traversing algorithm. optimistic PDES conservative PDES

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