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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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Performance of hard real-time transaction scheduling policies in parallel database systems

Performance of hard real-time transaction scheduling policie...

引用

proceedings of the 1998 6th International Symposium on Modeling, Analysis and simulation of Computer and Telecommunications Systems, MASCOTS

作者： Takkar, Sonia Dandamudi, Sivarama P. Carleton Univ Ottawa Canada

Real-time transactions, in addition to preserving consistency of the database as in traditional transactions, have to meet the deadlines. Scheduling real-time transactions in parallel database systems has not received much attention. This paper focuses on real-time transaction scheduling in shared-nothing parallel database systems. We evaluate the performance of a new priority-based scheduling policy, in which all scheduling decisions are made locally by each node. In contrast, several other algorithms, proposed for the distributed systems, require communication among the nodes to globally synchronize their local block and abort decisions. Such synchronization can deteriorate performance as real-time transactions will have to meet deadlines. We use miss ratio as the performance metric and show that, in general, the new policy provides a superior performance for the workload and system parameters considered in this study.

关键词： Database systems

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Don't trust parallel Monte Carlo!

Don't trust parallel Monte Carlo!

引用

workshop on Principles of Advanced and distributed simulation (PADS)

作者： P. Hellekalek Department of Mathematics University of Salzburg Salzburg Austria

parallel Monte Carlo simulation requires reliable RNGs. For sequential machines, good generators exist. It is not at all trivial to find high quality RNGs for parallel machines. We present a review of the main concepts to produce random numbers on parallel processors and further, we illustrate some phenomena that occur with parallelization.

关键词： Monte Carlo methods Random number generation Stochastic processes Testing Mathematics parallel machines Random variables Software packages Computational modeling Analytical models

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Linear and inversive pseudorandom numbers for parallel and distributed simulation

Linear and inversive pseudorandom numbers for parallel and d...

引用

workshop on Principles of Advanced and distributed simulation (PADS)

作者： K. Entacher A. Uhl S. Wegenkittl Department of Mathematics Salzburg University Salzburg Austria Salzburg University Salzburg Austria

We discuss the use and possible abuse of linear and inversive pseudorandom numbers (PRNs) in parallel and distributed environments. After an investigation of properties of PRNs which determine how these may be applied in such environments, we introduce a software package which provides a unified and easy to use approach to the generating and handling of parallel streams of such PRNs. Experimental results are conducted which describe the features of the software package and compare the performance of two selected types of pseudorandom number generators.

关键词： Software packages Discrete event simulation Computational modeling Protocols Packaging Mathematics Application software Discrete event systems distributed computing Statistical distributions

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parallel simulation in rewriting logic: some observations

Parallel simulation in rewriting logic: some observations

引用

Euromicro workshop on parallel and distributed Processing

作者： K. Djemame M. Bettaz Computing Science Department University of Glasgow Glasgow UK Computing Science Institute University of Constantine Algeria

In this paper, the relationship between the computational models of object-oriented rewriting and parallel discrete-event simulation models is explored. A discrete-event simulation program in which several objects interact with each other by exchanging messages may have a high degree of concurrency (which can be exploited using optimistic or conservative parallel simulation methods). We report on some observations on using rewriting logic in the field of parallel discrete event simulations, and investigate how parallel simulation applications can be expressed using object-oriented rewriting.

关键词： Logic Object oriented modeling Discrete event simulation Concurrent computing Computational modeling Optimization methods parallel programming Engines Real time systems Object oriented databases

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A probabilistic event scheduling policy for optimistic parallel discrete event simulation

A probabilistic event scheduling policy for optimistic paral...

引用

workshop on Principles of Advanced and distributed simulation (PADS)

作者： T.K. Som R.G. Sargent Simulation Research Group Syracuse University Syracuse NY USA

A probabilistic scheduling policy for selecting the next event to be processed by a processor during optimistic parallel discrete event simulation is presented. This policy exploits the knowledge about statistical distributions of the difference between the timestamps of successively committed events of a logical process. simulation results are presented to demonstrate that under appropriate conditions, probabilistic scheduling generates substantially fewer rollbacks compared to the lowest timestamp first scheduling policy.

关键词： Discrete event simulation Processor scheduling Scheduling algorithm Statistical distributions Computational modeling

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Nops: a conservative parallel simulation engine for TeD

Nops: a conservative parallel simulation engine for TeD

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： A.L. Poplawski D.M. Nicol Department of Computer Science Dartmouth College Hanover NH USA

The paper describes Nops, a conservatively synchronized process oriented parallel simulation system. Nops is designed to support the programming model of the Telecommunications Description Language (TeD), with special emphasis on scaling up to very large network models. We chronicle the decisions beyond Nops' design, describe that design, assess its raw performance relative to CSIM, Maisie, and GTW, and study its ability to scale to large models.

关键词： Engines Yarn Computational modeling Computer simulation Memory management Packaging Delay Computer science Educational institutions parallel processing

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Generalizing lookahead-behavioral prediction in distributed simulation

Generalizing lookahead-behavioral prediction in distributed ...

引用

workshop on Principles of Advanced and distributed simulation (PADS)

作者： J.W. Janneck Computer Engineering and Networks Laboratory Swiss Federal Institute of Technology Zurich Switzerland

One of the key factors for efficiency in distributed simulation is the detection of model-inherent concurrency, which is related on the prediction of the future behavior of each logical simulation process. We present a generalization of traditional approaches to behavioral prediction which provides more accurate predictions in general and a high degree of scalability in terms of computational and communication overhead. We give a sequential implementation, prove its correctness using concepts from the analysis of real time process networks and then show how these results can be used in distributed simulation.

关键词： Predictive models Computational modeling Concurrent computing Analytical models Computer simulation Protocols Computer networks distributed computing Intelligent networks Laboratories

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A methodology for automating the parallelization of manufacturing simulations

A methodology for automating the parallelization of manufact...

引用

workshop on Principles of Advanced and distributed simulation (PADS)

作者： S.J. Turner Chu Cheow Lim Yoke Hean Low Wentong Cai Wen Jing Hsu Shell Ying Huang Gintic Institute of Manufacturing Technology Singapore Singapore School of Applied Science Nanyang Technological University Singapore Singapore

One of the main reasons why parallel discrete event simulation has not been adopted more widely in industry is that the terminology used by the parallel simulation community differs from that of industrial simulation practitioners. The paper shows how the gap between these two communities can be bridged by presenting a methodology for automating the parallelization of manufacturing simulations. Our approach provides a way of automatically generating a mapping from a sequential simulation model to an efficient parallel implementation. The results of this mapping can be expressed in a form which is independent of any particular parallel simulation system or language. Since it is easy to generate code for different simulation systems, it is possible to evaluate alternative parallel simulation protocols at an early stage of development. A prediction of the performance can thus be obtained by studying the behaviour of an abstraction of the simulation model with various strategies or on different computing platforms.

关键词： Manufacturing automation Virtual manufacturing Computational modeling Discrete event simulation Predictive models Manufacturing processes Manufacturing industries Terminology Packaging Switches

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Shared memory implementation of a parallel switch-level circuit simulator

Shared memory implementation of a parallel switch-level circ...

引用

workshop on Principles of Advanced and distributed simulation (PADS)

作者： Y.-A. Chen R. Bagrodia Computer Science Department University of California Los Angeles Los Angeles CA USA

Circuit simulation is a critical bottleneck in VLSI design. The paper describes the implementation of an existing parallel switch level simulator called MIR-SIM on a shared memory multiprocessor architecture. The simulator uses a set of three different conservative protocols: the null message protocol; the conditional event protocol and the accelerated null message protocol; and combinations of the preceding two algorithms. The paper describes the implementation of these protocols to exploit shared memory features, measures their relative performance for a set of six benchmark circuits ranging in size from 3000 to almost 70000 transistors, and compares the speedup obtained by each of the three protocols.

关键词： Switching circuits Protocols Circuit simulation Switches Very large scale integration Memory architecture Discrete event simulation Acceleration Velocity measurement Size measurement

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Dynamic virtual logical processes

Dynamic virtual logical processes

引用

workshop on Principles of Advanced and distributed simulation (PADS)

作者： M. Hybinette R. Fujimoto College of Computing Georgia Institute of Technology Atlanta GA USA

The implementation of a cloning mechanism that allows for the evaluation of multiple simulated futures is presented and its performance is analyzed. A running parallel discrete event simulation is dynamically cloned at decision points to explore different execution paths concurrently. In this way, what-if and alternative scenario analysis in gaming, tactical and strategic applications can be evaluated interactively or non-interactively. Performance results show that virtual logical processes, a new mechanism developed to avoid repeating common computations among clones improves efficiency.

关键词： Discrete event simulation Cloning Protocols Computational modeling Analytical models Educational institutions Performance analysis Process planning Decision making Monitoring

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