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

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SQTW: a mechanism for state-dependent parallel simulation. Description and experimental study

SQTW: a mechanism for state-dependent parallel simulation. D...

引用

workshop on Principles of Advanced and distributed simulation (PADS)

作者： A. Fabbri L. Donatiello Dipartimento di Scienze dell'Informazione Università di Bologna Bologna Italy Dipartimento di Scienze dellInformazione Università di Bologna Bologna Italy

We address the problem of efficiently performing parallel discrete-event simulation in the case where event elaboration is independent of other processes' local states. We propose a parallel simulation policy, called State Query Time Warp (SQTW), based on the Time Warp mechanism. We present experiments performed by means of a SQTW-based parallel simulator on a T-800 transputer machine for solving performance models based on state-dependent routing queueing network models. The experiments are used for assessing overheads and efficiency involved by SQTW; results show that high efficiency is achievable, and surprisingly reveal that SQTW is able to globally reduce rollback overheads with respect to corresponding Time Warp simulations.

关键词： Discrete event simulation Computational modeling Time warp simulation Routing Optimization methods Data structures Error correction Concurrent computing Computer architecture Computer networks

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Analysis of large GSPN models: a distributed solution tool

Analysis of large GSPN models: a distributed solution tool

引用

International workshop on Petri Nets and Performance Models (PNPM)

作者： P. Marenzoni S. Caselli G. Conte Dipartimento di Ingegneria Informazione Universitá di Parma Parma Italy

distributed computing systems, making available large memories and powerful computational resources allow the analysis of problems of unprecedented complexity. The exploitation of the potential offered by these systems highly depends upon the availability of efficient tools devoted to the solution of specific problems. The paper describes a distributed approach to the analysis of large GSPN models whose applicability to real systems was often constrained by the explosion in the size of the underlying state space representation. A performing algorithm for distributed construction of large state space graphs generated by GSPN models is described in detail. The subsequent distributed numerical solution of the Markov chain is then presented and discussed, along with its current limitations. The implementation of the complete distributed solution tool is integrated with the well known GreatSPN package. The use of the widespread MPI Message Passing library makes the tool portable on a large class of distributed and parallel architectures. Performance results in the case of nets with large stale space cardinalities are discussed, considering an experimental low-cost, general purpose PC cluster.

关键词： State-space methods Message passing Workstations Power system modeling distributed computing Availability Packaging Delay parallel architectures Stochastic systems

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Performance of a conservative simulator of ATM networks

Performance of a conservative simulator of ATM networks

引用

workshop on Principles of Advanced and distributed simulation (PADS)

作者： J.G. Cleary Jya-Jang Tsai Department of Computer Science University of Waikato New Zealand

The paper describes an implementation of a conservative parallel distributed simulator that has been used to simulate a high fidelity model of ATM networks. Important optimisations of the simulator for this application are described. The performance of the simulator is reported on up to 12 processors and compared with a sequential implementation. It is seen that the simulator gives good speedup and better performance than the sequential implementation. It is noted that the low overhead of the simulator relies on there being good lookahead in realistic models of ATM networks. Some situations where this lookahead is significantly reduced are described together with future extensions to fix these problems.

关键词： Asynchronous transfer mode Computational modeling Switches Traffic control TCPIP Delay Computer science Circuit simulation Design optimization Complex networks

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Design of high-speed parallel arithmetic algorithms and architectures

Design of high-speed parallel arithmetic algorithms and arch...

引用

International workshop on distributed Interactive simulation and Real Time Applications

作者： V. Markova Supercomputer Softvare Department Novosibirsk Russia

Presents an algorithm for computing a sum of products, realizing a fundamental compound multiply-and-add operation of high-speed arithmetic. Two new cellular pipelined algorithms and architectures (2D and 3D) are proposed. The initial data and results are binary signed-digit integers. The multipliers are loaded digit-serially, while the multiplicands are loaded in a digit-parallel fashion and the results are produced in the same way. The design is performed in terms of cellular technology, based on an original model of distributed computation (the parallel substitution algorithm). The time- and structural complexity is obtained.

关键词： Algorithm design and analysis Arithmetic Computer architecture Hardware Pipeline processing Topology Supercomputers Computational modeling distributed computing Signal processing

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A new approach for partitioning VLSI circuits on transistor level

A new approach for partitioning VLSI circuits on transistor ...

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： N. Frohlich R. Schlagenhaft J. Fleischmann Institute of Electronic Design Automation Technical University Munich Munich Germany

For parallel simulation of VLSI circuits on the transistor level a sophisticated partitioning of the circuits into subcircuits is crucial. Each net connecting the subcircuits causes additional communication and computation effort. As the slave processors simulating the subcircuits advance synchronously in time, the computation effort for each subcircuit should be approximately the same. In this paper a new approach for partitioning VLSI circuits on the transistor level yielding a low number of interconnects between the subcircuits and balanced subcircuit sizes is presented. simulation of industrial circuits using this partitioning is up to 41% faster than with other known partitioning approaches for parallel analog simulation.

关键词： Very large scale integration Circuit simulation Computational modeling Integrated circuit interconnections Workstations Electronic design automation and methodology Transistors Laboratories Hardware Circuit testing

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distributed simulation of spatially explicit ecological models

Distributed simulation of spatially explicit ecological mode...

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： K. Glass M. Livingston J. Conery Computational Science Institute University of Oregon Eugene OR USA

Large-scale ecological simulations are natural candidates for distributed discrete event simulation. In optimistic simulation of spatially explicit models, a difficult problem arises when individuals migrate between physical regions simulated by different logical processes. We present a solution to this problem that uses shared object states. Shared states allow for efficient communication between LPs and for early detection of canceled events. We briefly describe an optimistic simulation environment called EcoKit, which operates on top of the WarpKit implementation of Time Warp. Our experiments with this system on a shared memory multiprocessor show that EcoKit promises to scale well both with the number of processors and the number of individuals simulated.

关键词： Biological system modeling Animals Mice Discrete event simulation Time warp simulation Diseases Control systems Delay

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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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Conservative synchronization in object-oriented parallel battlefield discrete event simulations

Conservative synchronization in object-oriented parallel bat...

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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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Hierarchical modeling and distributed simulation with HIT

Hierarchical modeling and distributed simulation with HIT

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： A.M. Warda M. Sczittnick CompuNet Computer Vertiebs GmbH Essen Germany Lehrstuhl lnformatik IV Universität Dortmund Dortmund Germany

The Hierarchical Tool HIT is a software tool for hierarchical modeling and performance evaluation of discrete event systems. Besides analytical and numerical solution techniques HIT provides the evaluation of models by sequential simulation. The authors present concepts for optimistic distributed simulation of HIT models by partitioning them with respect to subhierarchies. The main goals of the concept being presented are the preservation of model structure even in lower levels of the realization (e.g. use of the process view of simulation throughout all levels of abstraction) and distribution transparency on the modeling level (homogeneous model specification for all solution techniques).

关键词： Software tools Discrete event systems Frequency estimation Computational modeling Analytical models Discrete event simulation Petri nets High level languages Frequency measurement Virtual prototyping

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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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