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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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proceedings of the 1997 5th International Symposium on Modeling, Analysis and simulation of Computer and Telecommunication Systems, MASCOTS'97

Proceedings of the 1997 5th International Symposium on Model...

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proceedings of the 1997 5th International Symposium on Modeling, Analysis and simulation of Computer and Telecommunication Systems, MASCOTS'97

The proceedings contains 36 papers from the Fifth International Symposium on Modeling, Analysis and simulation of Computer and Telecommunication Systems. Topics discussed include: load sharing and scheduling in distributed systems;parallel and distributed system simulation;high-speed communication network controllers;teletraffic modeling methodology;scientific visualization tools;asynchronous transfer mode (ATM) networks;multiprocessing systems design and analysis;network topology design and modeling;and fault-tolerant systems.

关键词： Telecommunication systems

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DEVS formalism as a framework for advanced distributed simulation 1

DEVS formalism as a framework for advanced distributed simul...

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1st International workshop on distributed Interactive simulation and Real Time Applications, DS-RT 1997

作者： Zeigler, B.P. Kim, Doohwan Praehofer, H. Electrical and Computer Engineering University of Arizona TucsonAZ85721 United States Systems Theory and Information Engineering Johannes Kepler University LinzA-4040 Austria

ISBN: (纸本)0818677732

Advanced distributed simulation (ADS) is an enabling concept to support the networked interaction of models and real-world elements resident at geographically dispersed sites planned for next-generation simulation environments such as the Joint simulation System (JSIMS). In this paper, we review the DEVS (discrete event systems specification) formalism and indicate why it provides the right framework to address many of the difficult technical issues that must be solved to enable ADS to provide infrastructures for distributed simulation. Then we address two of these issues in detail. The first issue addressed is the use of filtering and predictive contracts to reduce the tremendous amounts of data and control messages that must be transmitted in simulations. The second part focuses on scheduling and synchronization mechanisms for the efficient parallel execution of such models. © 1997 IEEE.

关键词： Circuit simulation

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Adaptive flow control in Time Warp

Adaptive flow control in Time Warp

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proceedings of the 1997 11th workshop on parallel and distributed simulation

作者： Panesar, Kiran S. Fujimoto, Richard M. Intel Corp Hillsboro OR United States

It is well known that Time Warp may suffer from poor performance due to excessive rollbacks caused by overly optimistic execution. Here we present a simple flow control mechanism using only local information and GVT that limits the number of uncommitted messages generated by a processor, thus throttling overly optimistic TW execution. The flow control scheme is analogous to traditional networking flow control mechanisms. A `window' of messages defines the maximum number of uncommitted messages allowed to be scheduled by a process. Committing messages is analogous to acknowledgments in networking flow control. The initial size of the window is calculated using a simple analytical model that estimates the instantaneous number of messages that a process will eventually commit. This window is expanded so that the process may progress up to the next commit point (generally the next fossil collection), and to accommodate optimistic execution. The expansions to the window are based on monitoring TW performance statistics so the window size automatically adapts to changing program behaviors. The flow control technique presented here is simple and fully automatic. No global knowledge or synchronization (other than GVT) is required. We also develop an implementation of the flow control scheme for shared memory multiprocessors that uses dynamically sized pools of free message buffers. Experimental data indicates that the adaptive flow control scheme maintains high performance for `balanced workloads', and achieves as much as a factor of 7 speedup over unthrottled TW for certain irregular workloads.

关键词： parallel processing systems

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distributed land-cover change simulation 97

Distributed land-cover change simulation

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proceedings of the 1997 5th International workshop ob Advances in Geographic Information Systems, ACM-GIS

作者： Berry, M.W. Minser, K.S. Department of Computer Science University of Tennessee 107 Ayres Hall Knoxville TN

ISBN: (纸本)9781581130171

Computer simulations are used in landscape ecology to simulate the effects of human land-use decisions on the environment. Such decisions are influenced by both ecological and socioeconomic factors which can be represented by spatially explicit multidisciplinary data. The Land-Use Change Analysis System (or LUCAS) was developed to study the effects of land-use on landscape structure in such areas as the Little Tennessee River Basin in western North Carolina and the Olympic Peninsula of Washington state. These effects include land-cover change and species habitat suitability. Using a geographic information system (GIS) to store, display and analyze map layers derived from remotely sensed images, census and ownership maps, topological maps, and output from econometric models, a parallel/distributed version of LUCAS (pLUCAS) was developed for simulations on a network of workstations. Targeting distributed computational environments reflects the resources available to most land-use planners, forestry personnel, and wildlife managers. A performance evaluation of two pLUCAS distributed models on an ATM-based network of 12 SUN Ultra-2 workstations is presented.

关键词： Geographic information systems

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Enhanced hybrid range partitioning strategy for parallel database systems

Enhanced hybrid range partitioning strategy for parallel dat...

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proceedings of the 1997 8th International workshop on Database and Expert Systems Applications, DEXA'97

作者： Nguyen, Khanh Quoc Thompson, Tony Bryan, George Univ of Western Sydney Kingswood

Load balancing is a critical issue for parallel database systems. There are two common load balancing methods, access equalization and data equalization approaches. In this paper, we present a new data equalization load balancing approach for the hybrid-range partitioning scheme. The algorithm is an extension of the conventional hybrid-range partitioning and features variable-size fragments to counter the data skew problem, which was not addressed in the conventional scheme. The algorithm load balancing costs and the performance improvements are testified by using a simple simulation.

关键词： distributed database systems

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Molecular dynamics algorithm for the simulation of polymer-liquid-crystals self-organizaton using distributed processor system

Molecular dynamics algorithm for the simulation of polymer-l...

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International workshop on New Approaches to High-Tech Materials: Nondestructive Testing and Computer simulations in Materials Science and Engineering

作者： Efleev, Alexander N. Department of Metal Physics Physics and Mechanics Faculty St.Petersburg State Technical Univ. Polytekhnicheskaya 29 St.Petersburg 195251 Russia

In this contribution, I report on a molecular-dynamics algorithm for the simulation of the self-organization of longitudinal polymer liquid crystals on the fully-distributed computer system. The peculiarities of the hardware and software for this system are disscussed. It is shown that the parallelization of algorithm is carryed out by the distribution of all the particles incorporated into a macromolecule among several processors connected to each other in the framework of selected virtual topology and by the parallel execution of several program copies by these processors. The timing of execution at the system of different processor numbers is discussed.

关键词： Nematic liquid crystals

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Feedback control in time warp synchronized parallel simulators 1

Feedback control in time warp synchronized parallel simulato...

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1st International workshop on distributed Interactive simulation and Real Time Applications, DS-RT 1997

作者： Wilsey, P.A. Dept. of ECECS PO Box 210030 CincinnatiOH45221-0030 United States

ISBN: (纸本)0818677732

The time warp mechanism is one of the most important synchronization protocols for parallel simulation. However for most applications, the successful use of time warp requires the careful selection of time warp optimization parameters (e.g. cancellation strategies, state saving frequency, and so on). Unfortunately, the optimal setting for the simulation parameters may not hold across an application domain or even throughout the entire simulation lifetime of a single application. Consequently, several investigators have proposed the dynamic adjustment of simulation parameters over the lifetime of the simulation. The dynamic adjustment of simulation parameters requires careful design considerations. Many of these considerations are similar to the problems studied by traditional nonlinear and adaptive control theorists. These considerations include the need to implement an adjustment mechanism that converges to stable values and the need to understand how parameter adjustment affects (sampled) output values. However, the dynamic adjustment of simulation parameters occurs by using general CPU cycles and thus introduces overhead into the simulation. This overhead must be carefully controlled-too little processing and the control system may not respond correctly;too much processing and the overall simulation performance may deteriorate. We address the design of two distinct feedback control systems for dynamic parameter adjustment and describe the design considerations that were made in their construction. © 1997 IEEE.

关键词： Feedback control

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distributed interactive simulation for synthetic forces

Distributed interactive simulation for synthetic forces

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6th Heterogeneous Computing workshop (HCW 97)

作者： Messina, P Brunett, S Davis, D Gottschalk, T Curkendall, D Ekroot, L Siegel, H California Inst of Technology Pasadena United States

ISBN: (纸本)0818678798

Interactive simulation of battles is a valuable took for training. The behavior and movement of hundreds or thousands of entities (tanks, trucks, airplanes, missiles, etc.) is currently simulated using dozens or more workstations on geographically distributed LANs connected by WANs. The simulated entities can move, fire weapons, receive ''radio'' messages, etc. The terrain that they traverse may change dynamically, for example due to rains turning dirt roads into mud or bombs forming craters. Thus the entities need to receive frequent information about the state of the terrain and the location and state of other entities. Typically, information is updated several times a second. As the number of simulated entities grows, the number of messages that need to be sent per unit of time can grow to unmanageable numbers. One approach to reducing the number of messages is to keep track of what entities need to know about which other entities and only send information to the entities that need to know. For example, tanks in Germany need not know about a change of course of a ship in the Pacific. This technique for reducing messages is known as interest management. Caltech and its Jet Propulsion Laboratory have implemented a simulation of this type on several large-scale parallel computers, exploiting both the compute pourer and the fast messaging fabric of such systems. The application is implemented using a heterogeneous approach. Some nodes are used to simulate entities, some to manage a database of terrain information, some to provide interest management functions, and some to route messages to the entities that do need to receive the information. Some of these tasks require more memory than others, some require faster processing capability. Thus the application is heterogeneous both in its functional decomposition and to a smaller extent in the characteristics of the hardware that is used to run each function. In addition, workstations are used to run the Graphical User

关键词： distributed computer systems

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Tolerant synchronization for distributed simulations of interconnected computer networks

Tolerant synchronization for distributed simulations of inte...

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： P. Martini M. Rumekasten J. Tolle Institute of Computer Science IV University of Bonn Bonn Germany

The paper presents the tolerant, hybrid synchronization schema and its benefits for the parallel and distributed simulation of interconnected computer networks. The hybrid schema combines conservative and optimistic synchronization approaches by using lookahead for scheduling special events and using the flexibility of time warp in certain cases. In addition to these classical approaches the introduction of the "tolerance" allows the distributed modules to simulate further ahead than guaranteed by the conservative synchronization schema. This results in significantly smaller simulation runtimes and many other benefits.

关键词： Computational modeling Computer simulation Computer networks Runtime Atherosclerosis Discrete event simulation Time warp simulation Computer science Electronic mail Processor scheduling

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The threshold of event simultaneity

The threshold of event simultaneity

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： F. Wieland MITRE Corporation McLean VA USA

We revisit the notion of event simultaneity in the context of parallel and distributed simulation. Although the simulation community has recognized this problem for years, it has focused mainly on the mechanics of breaking event-time ties and has neither measured its extent nor considered its implications. Exant simulators (both serial and parallel) prohibit simultaneity either by user-specified event priorities or by an arbitrary (but well-documented) tie-breaking mechanism. We show, theoretically and empirically, that these strategies may lead to an invalid simulation. In doing so, we introduce the threshold of event simultaneity and use it to understand the semantics of simultaneity.

关键词： Discrete event simulation Computational modeling Context modeling Mechanical variables measurement Processor scheduling Concurrent computing Error correction Airports Aerospace simulation Delay effects

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