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检索条件"任意字段=Proceedings of the 1997 11th Workshop on Parallel and Distributed Simulation"

共 93 条记录，以下是61-70 订阅

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Conservative synchronization in object-oriented parallel battlefield discrete event simulations

Conservative synchronization in object-oriented parallel bat...

引用

workshop on Principles of Advanced and distributed simulation (PADS)

作者： J.B. Hiller T.C. Hartrum Department of Electrical and Computer Engineering School of Engineering Air Force Institute of Technology OH USA

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： Object oriented modeling Discrete event simulation Computational modeling System recovery Performance gain Partitioning algorithms Gratings Testing Filters

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Asynchronous parallel algorithms for test set partitioned fault simulation

Asynchronous parallel algorithms for test set partitioned fa...

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： D. Krishnaswamy P. Banerjee E.M. Rudnick J.H. Patel Center for Reliable and High Performance Computing University of Illinois Urbana IL USA Center for Parallel and Distributed Computing Northwestern University Evanston IL USA

We propose two new asynchronous parallel algorithms for test set partitioned fault simulation. the algorithms are based on a new two-stage approach to parallelizing fault simulation for sequential VLSI circuits in which the test set is partitioned among the available processors. these algorithms provide the same result as the previous synchronous two stage approach. However, due to the dynamic characteristics of these algorithms and due to the fact that there is very minimal redundant work, they run faster than the previous synchronous approach. A theoretical analysis comparing the various algorithms is also given to provide an insight into these algorithms. the implementations were done in MPI and are therefore portable to many parallel platforms. Results are shown for a shared memory multiprocessor.

关键词： parallel algorithms Circuit faults Circuit simulation Partitioning algorithms Circuit testing Computational modeling Sequential circuits Semiconductor device testing distributed computing Algorithm design and analysis

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A distributed numerical/simulative algorithm for the analysis of large continuous time Markov chains

A distributed numerical/simulative algorithm for the analysi...

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： P. Buchholz Informatik IV Universität Dortmund Dortmund Germany

A distributed algorithm is introduced for the analysis of large continuous time Markov chains (CTMCs) by combining in some sense numerical solution techniques and simulation. CTMCs are described as a set of processes communicating via message passing. the state of a process is described by a probability distribution over a set of reachable states rather than by a single state. simulation is used to determine event times and messages types to be exchanged, whereas transitions are realized by vector matrix products as in iterative numerical analysis techniques. In this way, the state space explosion of numerical analysis is avoided, but it is still possible to determine more detailed results than with simulation. parallelization of the algorithm is realized applying a conservative synchronization scheme, which exploits the possibility of precomputing event times as already proposed for parallel simulation of CTMCs. In contrast to a pure simulation approach, the amount of computation is increased, whereas the amount of communication keeps constant. Hence it is possible to achieve even on a workstation cluster a significant speedup.

关键词： Analytical models Numerical simulation Algorithm design and analysis Computational modeling Discrete event simulation Numerical analysis distributed algorithms Message passing Probability distribution State-space methods

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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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Stack-free process-oriented simulation

Stack-free process-oriented simulation

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： C.J.M. Booth D.I. Bruce Defence Evaluation and Research Agency Malvern UK

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 implementations. We 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 pre-emption.

关键词： Object oriented modeling Discrete event simulation Yarn Modems Cost function Logic Access protocols Insulation Programming profession Aging

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Dag consistent parallel simulation: a predictable and robust conservative algorithm

Dag consistent parallel simulation: a predictable and robust...

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： Wentong Cai E. Letertre S.J. Turner School of Applied Science Nanyang Technological University Singapore Department of Computer Science University of Exeter Exeter UK

We present a novel approach to parallel discrete event simulation based on the Cilk model of multithreaded computation. Cilk's runtime system not only manages the low-level aspects of program execution, but also provides the user with an algorithmic model of performance which can be used to predict the execution time of a parallel simulation. Moreover, a Cilk application can "scale down" to run on a single processor with nearly the same performance as that of serial code. A conservative parallel discrete event simulation algorithm has been developed in which communication between logical processes is achieved using Cilk's virtual memory model, dag consistent shared memory. the simulation executes in cycles, where each cycle involves a divide and conquer computation. Although local lookahead information can be exploited, the algorithm is robust in that it also calculates a global simulation time for each cycle. It can therefore be used for applications where zero lookahead may occur.

关键词： Predictive models Robustness Yarn Discrete event simulation Computational modeling parallel architectures parallel machines Costs Algorithm design and analysis Computer science

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MRE: a flexible approach to multi-resolution modeling

MRE: a flexible approach to multi-resolution modeling

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： A. Natrajan P.F. Reynolds S. Srinivasan Department of Computer Science Thornton Hall University of Virginia Charlottesville VA USA Mystech Associates Inc. Falls Church VA USA

Multi-resolution representation of simulated entities is considered essential for a growing portion of distributed simulations. Heretofore, modelers have represented entities at just one level of resolution, or have represented concurrent representations in an inconsistent manner. the authors address the question of the cost of maintaining multiple, concurrent representations. they present a brief overview of the concept of a multiple resolution entity (MRE) and attribute dependency graph (ADG) both originally described elsewhere, and then compare simulation and consistency costs of some approaches, including our own MRE/ADG-based approach, to multi-resolution modeling. the cost analysis presented is the first known analysis of its type, and will provide a basis for simulation designers to determine the best, and most cost-effective approach to supporting simulation of entities at different levels of resolution concurrently.

关键词： Costs Uniform resource locators Analytical models Computer science Computer simulation Delay

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A workstation-based parallel direct-execution simulator

A workstation-based parallel direct-execution simulator

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： P.M. Dickens Illinois Institute of Technology USA

It is important to understand and efficiently predict the performance of large codes executing on massively parallel machines. However, these very large machines are scarce, expensive, and generally unavailable to large segments of the research community. It is therefore important to implement performance analysis tools for such machines on platforms that are readily available to the research community at large. To meet this need, we have ported LAPSE, a parallel direct-execution simulator, from the Intel Paragon to an ordinary cluster of workstations. the goal of this research is to provide researchers the opportunity to study codes designed for execution on a massively parallel machine while physically executing on a workstation cluster. However, we encountered significant performance problems when moving to a workstation cluster, due primarily to high communication and context switching costs. To reduce these costs, we implemented the virtual processors of the simulated system using light-weight threads rather than heavy-weight Unix processes. In this paper, we discuss the issues involved in moving from a process-based to a thread-based simulator, and demonstrate up to a four fold increase in performance by doing so.

关键词： Computational modeling Workstations Costs parallel machines Communication switching NASA Yarn Analytical models Computer simulation Scalability

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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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Dynamic load balancing strategies for conservative parallel simulations

Dynamic load balancing strategies for conservative parallel ...

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： A. Boukerche S.K. Das Center for Research in Parallel and Distributed Computing Department of Computer Science University of North Texas Denton TX USA

this paper studies the problem of load balancing for conservative parallel simulations for execution on a multicomputer. the synchronization protocol makes use of Chandy-Misra (1979) null-messages. We propose a dynamic load balancing algorithm which assumes no compile time knowledge about the workload parameters. It is based upon a process migration mechanism, and the notion of CPU-queue length, which indicates the workload at each processor. We examine two variations for the algorithm which we refer to as centralized and multi-level hierarchical methods, in the context of queueing network simulation of a torus. the torus was chosen because its many cycles aid in the formation of deadlock, making it a stress test for any conservative synchronization protocols. Our experiments indicate that our dynamic load balancing schemes significantly reduce the run time of an optimized version of Chandy-Misra null message approach, and decreases by 30-40% the synchronization overhead when compared to the use of a static partitioning algorithm. Significantly, the results obtained also indicate that the multi-level scheme always outperforms both the centralized load balancing approach and the static partitioning algorithm.

关键词： Load management Computational modeling Protocols distributed computing Stress Testing Partitioning algorithms Discrete event simulation Computer simulation Concurrent computing

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