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

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proceedings. Seventeenth workshop on parallel and distributed simulation

Proceedings. Seventeenth Workshop on Parallel and Distribute...

引用

workshop on Principles of Advanced and distributed simulation (PADS)

The following topics are dealt with: optimistic simulation; high level architecture; network simulation; conservative simulation.

关键词： Optimization methods parallel processing Communication system routing Communication system software

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An implementation of the SSF scalable simulation framework on the cray MTA 17

An implementation of the SSF scalable simulation framework o...

引用

17th workshop on parallel and distributed simulation

作者： Henry, RR Kahan, SH Liu, J Nicol, DM Cray Res Inc Seattle WA 98104 USA

ISBN: (纸本)0769519709

Large-scale parallel discrete event simulations of massive networks, such as the Internet, are "Grand Challenge" problems: packet level simulation of even a small fraction of the Internet would consume the resources of the most powerful computers available. We reimplement the SSF Scalable simulation Framework so we can run large-scale network simulations originally written for DaSSF Our implementation, CraySSF is designed for the Cray-MTA, a multi-threaded supercomputer architecture developed specifically to address large-scale computations of the kind that are not easily distributed. This paper describes the architecture, implementation issues, and preliminary performance results on a variety of (stock) serial and parallel architectures.

关键词： Computational modeling Computer architecture Computer networks Computer simulation Concurrent computing Discrete event simulation distributed computing IP networks Large-scale systems Supercomputers

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Predictable time management for real-time distributed simulation 17

Predictable time management for real-time distributed simula...

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17th workshop on parallel and distributed simulation

作者： McLean, T Fujimoto, R Georgia Inst Technol Georgia Tech Res Inst Atlanta GA 30332 USA

ISBN: (纸本)0769519709

This paper introduces a technique to control the overhead of time management processes in order to make such mechanisms appropriate for real-time distributed simulation. A novel message accounting scheme, the offset-epoch method, is presented as a way to increase the efficiency of time management algorithms by eliminating transient messages. A synchronized lower-bound on timestamp (LBTS) computation exploits this efficiency to reduce time management overheads. This approach represents one step in bridging the gap that now exists between analytic and real-time distributed simulations.

关键词： Appropriate technology Clocks Computational modeling Computer network management Concurrent computing distributed computing Educational institutions Predictive models Synchronization Technology management

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Time-parallel trace-driven simulation of CSMA/CD 17

Time-parallel trace-driven simulation of CSMA/CD

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17th workshop on parallel and distributed simulation

作者： Wu, H Fujimoto, RM Ammar, M Georgia Inst Technol Coll Comp Atlanta GA 30332 USA

ISBN: (纸本)0769519709

Time-parallel simulation defines a methodology that can be applied to certain specific simulation problems. In this paper, we present a time-parallel approach for trace-driven simulation of the CSMA/CD protocol. The "memoryless" property of the physical system under moderate traffic loads allows for efficient time-parallel simulation. We also present two optimization techniques: the estimation of idle points and the incremental fix-up computation. The former can improve the probability that a subtrace begins with a known initial system state. The latter can speedup the fix-up computation that is required when the estimation of the initial state is incorrect.

关键词： Computational modeling Concurrent computing Discrete event simulation Educational institutions Multiaccess communication Partitioning algorithms Protocols State estimation Strips Telecommunication traffic

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DVS: An object-oriented framework for distributed verilog simulation 17

DVS: An object-oriented framework for distributed verilog si...

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17th workshop on parallel and distributed simulation

作者： Li, L Huang, H Tropper, C McGill Univ Sch Comp Sci Montreal PQ Canada

ISBN: (纸本)0769519709

There is a wide-spread usage of hardware design languages(HDL) to speed up the time-to-market for the design of modern digital systems. Verification engineers can simulate hardware in order to verify its performance and correctness with help of an HDL. However simulation can't keep pace with the growth in size and complexity of circuits and has become a bottleneck of the design process. distributed HDL simulation on a cluster of workstations has the potential to provide a cost-effective solution to this problem. In this paper we describe the design and implementation of DVS, an object-oriented framework for distributed Verilog simulation. Verilog is an HDL which sees wide industrial use. DVS is an outgrowth of Clustered Time Warp, originally developed for logic simulation. The design of the framework emphasizes simplicity and extensibility and aims to accommodate experiments involving partitioning and dynamic load balancing. Preliminary results obtained by simulating a 16bit multiplier are presented.

关键词： Circuit simulation Costs Digital systems Hardware design languages Object oriented modeling Process design Systems engineering and theory Time to market Voltage control Workstations

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Four types of lookback 17

Four types of lookback

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17th workshop on parallel and distributed simulation

作者： Chen, G Szymanski, BK Rensselaer Polytech Inst Dept Comp Sci Troy NY 12180 USA

ISBN: (纸本)0769519709

We present a classification that groups lookback into four types: direct strong lookback, universal strong lookback, direct weak lookback, and universal weak lookback. They are defined in terms of absolute and dynamic impact times. We discuss relationships between lookback types by considering,when rollbacks and/or anti-messages are avoided From different types of lookback, we also derive three optimization techniques for optimistic simulation and point out their advantages over lazy cancellation. Finally, we show that all four types of lookback exist in the PCS network simulation and can be exploited by either lookback-based or optimistic protocols.

关键词： Computer science Conferences Discrete event simulation Personal communication networks Protocols

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parallel network simulation under distributed genesis 17

Parallel network simulation under distributed genesis

引用

17th workshop on parallel and distributed simulation

作者： Szymanski, BK Liu, Y Gupta, R Rensselaer Polytech Inst Dept Comp Sci Troy NY 12180 USA

ISBN: (纸本)0769519709

We describe two major developments in the General Network simulation Integration System (Genesis): the support for BGP protocol in large network simulations and distribution of the simulation memory among Genesis component simulations. Genesis uses a high granularity synchronization mechanism between parallel simulations simulating parts of a network. This mechanism uses checkpointed simulation state to iterate over the same time interval until convergence. It also replaces individual packet data for flows crossing the network partitions with statistical characterization of such flows over the synchronization time interval. We had achieved significant performance improvement over the sequential simulation for simulations with TCP and UDP traffic. However, this approach can not be used directly to simulate dynamic routing protocols that use underlying network for exchanging protocol information, as no packets are exchanged in Genesis between simulated network parts. We have developed a new mechanism to exchange and synchronize BGP routing data among distributed Genesis simulators. The extended Genesis allows simulations of more realistic network scenarios, including routing flows, in addition to TCP or UDP data traffic. Large memory size required by simulation software hinders the simulation of large-scale networks. Based on our new support of distributed BGP simulation, we developed an approach to construct and simulate networks on distributed memory using Genesis simulators in such a way that each participating processor possesses only data related to the part of the network it simulates. This solution supports simulations of large-scale networks on machines with modest memory size.

关键词： Computational modeling Computer science Computer simulation Convergence Discrete event simulation Frequency synchronization Large-scale systems Routing protocols Telecommunication traffic Traffic control

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Scalable RTI-Based parallel simulation of networks 17

Scalable RTI-Based parallel simulation of networks

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17th workshop on parallel and distributed simulation

作者： Perumalla, KS Park, A Fujimoto, RM Riley, GF Georgia Tech Res Inst Coll Comp Atlanta GA 30332 USA

ISBN: (纸本)0769519709

Federated simulation interfaces such us the High Level Architecture (HLA) were designed for interoperability, and as such are not traditionally associated with high-performance computing. In this paper, we present results of a case study examining the use of federated simulations using runtime infrastructure (RTI) software to realize large-scale parallel network simulators. We examine the performance of two different federated network simulators, and describe RTI performance optimizations that were used to achieve efficient execution. We show that RTI-based parallel simulators can scale extremely well and achieve very high *** experiments yielded more than 80-fold scaled speedup in simulating large TCP/IP networks, demonstrating performance of up to 6 million simulated packet transmissions per second on a Linux cluster. Networks containing up to two million network nodes (routers and end systems) were simulated.

关键词： Computational modeling Computer architecture Computer interfaces Discrete event simulation Educational institutions Joining processes Large-scale systems Runtime Software performance Standards development

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Maya: a multi-paradigm network modeling framework for emulating distributed applications 17

Maya: a multi-paradigm network modeling framework for emulat...

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17th workshop on parallel and distributed simulation

作者： Zhou, JL Ji, ZG Takai, M Bagrodia, R Univ Calif Los Angeles Parallel Comp Lab Los Angeles CA 90095 USA

ISBN: (纸本)0769519709

This paper presents Maya, a multi-paradigm, scalable and extensible network modeling framework for emulating distributed applications. A novel three-tier architecture is proposed to integrate three disparate modeling paradigms, namely, discrete event models, analytical models and physical network interfaces into one unified framework of Maya. As the first effort to integrate all three paradigms into one framework, this paper discusses the implementations of Maya using Qualnet, fluid flow based TCP model and physical network interface. It addresses the performance issues involved in attaining the real time constraints imposed by distributed applications and demonstrates the effectiveness of using analytical models in Maya. Furthermore, it identifies the negative impact on real time performance through the computation intensive ordinary differential equation (ODE) solver in the fluid flow model. A new approach to interleaved executions of the fluid flow model is proposed to hide ODE solver turnaround time. As a result, the percentage of packets missing their deadlines has been reduced from more than 6% to less than 0.2%.

关键词： Analytical models Application software Computer networks distributed computing Fluid flow Network interfaces parallel processing Scalability Telecommunication traffic Traffic control

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HLA-based adaptive distributed simulation of wireless mobile systems 17

HLA-based adaptive distributed simulation of wireless mobile...

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17th workshop on parallel and distributed simulation

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

ISBN: (纸本)0769519709

Wireless networks' models differ from wired ones at least in the innovative dynamic effects of host-mobility and open-broadcast nature of the wireless medium. Topology changes due to simulated hosts' mobility map on causality effects in the "areas of influence" of each mobile device. The analysis of wireless networks Of interest today may include a potentially high number of simulated hosts, resulting in performance and scalability problems for discrete-event sequential simulation tools and methods, on a single physical execution unit (PEU). In a distributed simulation, the main bottleneck becomes the communication and synchronization required to maintain the causality constrains between distributed model components. In this work we propose a HLA-based, dynamic mechanism for the runtime management and allocation of model entities in a distributed simulation of wireless networks models, over a cluster of PEUs. By adopting a runtime evaluation of causal bindings between model entities we map the causal effects of virtual topology changes to dynamic migration of data structures. Preliminary results demonstrate that the prototype heuristics lead to a reduction in the percentage of external communication between the PEUs, limited overheads and performance enhancements for a worst-case scenario.

关键词： Analytical models Computational modeling Computer architecture Discrete event simulation Network topology Performance analysis Personal communication networks Runtime Scalability Wireless networks

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