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

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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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Active virtual network management protocol 99

Active virtual network management protocol

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proceedings of the thirteenth workshop on parallel and distributed simulation

作者： Stephen F. Bush General Electric Corporate Research and Development KWC-512 One Research Circle Niskayuna NY

ISBN: (纸本)9780769501550

This paper introduces a novel algorithm, the Active Virtual Network Management Protocol, for predictive network management. It explains how the Active Virtual Network Management Protocol facilitates the management of an active network by allowing future predicted state information within an active network to be available to network management algorithms. This is accomplished by coupling ideas from optimistic discrete event simulation with active networking. The optimistic discrete event simulation method used is a form of self-adjusting Time Warp. It is self-adjusting because the system adjusts for predictions which are inaccurate beyond a given tolerance. The concept of a streptichron and autoanaplasis are introduced as mechanisms which take advantage of the enhanced flexibility and intelligence of active packets. Finally, it is demonstrated that the Active Virtual Network Management Protocol is a feasible concept.

关键词： Network Management Optimistic Discrete Event simulation Self-Prediction Active Networks

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Fast-software-checkpointing in optimistic simulation: embedding state saving into the event routine instructions 99

Fast-software-checkpointing in optimistic simulation: embedd...

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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

In this paper we present a software approach, namely Fast-Software-Checkpointing (FSC), to reduce the running time of the state saving protocol in optimistic parallel discrete event simulation. The idea behind FSC is to use the instructions performed during the execution of an event as part of the state saving protocol, hence the total number of instructions due to state saving is reduced. Under FSC the time for saving the state of a logical process prior to the execution of an event e requires an amount of time proportional to the amount of state variables not updated by e's execution, as only these variables must be copied. This outlines that FSC shows some dualism with respect to incremental state saving. We show, however, that there exists a basic difference between the two solutions as in FSC some of the state saving instructions are actually event routine instructions, while in incremental state saving they are only added and mixed to the latter ones. We also present a simple software architecture to support FSC and simulation results to demonstrate the effectiveness of such solution. The obtained data show that FSC, combined with a sparse state saving strategy, may represent the best checkpointing solution in case of both medium/small state granularity simulations and large state granularity simulations even with small (but non-minimal) portions of the state updated by event execution. FSC may result therefore suited for a wide class of simulation problems.

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Identifying and localizing robots in a multi-robot system environment

Identifying and localizing robots in a multi-robot system en...

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IEEE International workshop on Intelligent Robots and Systems (IROS)

作者： K. Kato H. Ishiguro M. Barth Department of Computer and Communication Sciences Wakayama University Wakayama Japan Department of Social Informatics Kyoto University Sakyo Kyoto Japan Department of Electrical Engineering University of California Riverside CA USA

Development of multiple robot systems which solve complex and dynamic problems in parallel and distributed manners is one of the key issues in robotics research. The multiple robot systems require robust methods to identify robots for collaborative behaviors. This paper proposes a method using omnidirectional vision sensors for the identification between the robots. In addition to the several advantages of the omnidirectional vision sensor as a vision of a mobile robot, the omnidirectional vision sensor brings a significant benefit for realizing collaborative behaviors in multiple robot systems. After discussing on the algorithm, this paper shows several simulation results and real experimental results in a real environment.

关键词： Multirobot systems Robot sensing systems Robot vision systems Mobile robots parallel robots Sensor systems Cameras Mirrors Concurrent computing Informatics

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