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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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Consistent modeling of distributed mutual exclusion protocol using optimistic simulation 01

Consistent modeling of distributed mutual exclusion protocol...

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proceedings of the fifteenth workshop on parallel and distributed simulation

作者： Malcolm Yoke Hean Low David M. Nicol Programming Research Group Computing Laboratory University of Oxford Dept. of Computer Science Dartmouth College

ISBN: (纸本)9780769511047

This paper discusses the problem of risk in optimistic simulation protocols, using as example simulation of a distributed mutual exclusion protocol with strong consistency properties. The simulation model is augmented to detect model inconsistency errors resulting from risky optimistic simulation. While the model runs sequentially without consistency errors, errors occur when the model is executed in parallel optimistically. Some of the errors entirely violate the fundamental mutual exclusion properties of the model itself. To address this problem we extend the optimistic simulation library to eliminate these inconsistencies. We discuss the details of these extensions and the performance trade-off for adding them.

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Virtual time synchronization over unreliable network transport

Virtual time synchronization over unreliable network transpo...

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： K. Perumalla R. Fujimoto College of Computing Georgia Tech Atlanta GA USA

ISBN: (纸本)076951104X

In parallel and distributed simulations, it is sometimes desirable that the application's time-stamped events and/or the simulator's time-management control messages be exchanged over a combination of reliable and unreliable network channels. A challenge in developing infrastructure for such simulations is to correctly compute simulation time advances despite the loss of some simulation events and/or control messages. The authors present algorithms for synchronization in distributed simulations, performed directly over best-effort network transport. The algorithms are presented in a sequence of progressive refinement, starting with all reliable transport and finishing with combinations of reliable and unreliable transport for both time-stamped events and time management messages. Performance results from a preliminary implementation of these algorithms are also presented. To our knowledge, this is the first work to solve asynchronous time synchronization performed directly over unreliable network transport.

关键词： Discrete event simulation Computational modeling Context modeling Telecommunication network reliability Educational institutions Finishing Transport protocols Performance gain Algorithm design and analysis Fault tolerance

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The dependence list in time warp

The dependence list in time warp

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： Jing Lei Zhang C. Tropper School of Computer Science McGill University Montreal Canada

ISBN: (纸本)076951104X

Time Warp is known for its ability to maximize the exploitation of the parallelism inherent in a simulation. However, this potential has been undermined by the cost of processing causality violations. Minimizing this cost has been one of the most challenging issues facing Time Warp. In this paper, we present dependence list cancellation, a direct cancellation technique for Time Warp which is intended for use in a distributed memory environment such as a network of workstations. This approach provides for the swift cancellation of erroneous events, thereby preventing the propagation of their (erroneous) descendants. The dependence list also provides an event filtering function which detects erroneous future events, and also reduces the number of anti-messages used in the simulation. Our experimental work indicates that dependence list cancellation results in a dramatic reduction in the time required to process causality violations in Time Warp.

关键词： Discrete event simulation Costs Time warp simulation parallel processing Workstations Communication system control Very large scale integration Computer science Filtering Event detection

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Learning not to share [large-scale discrete event simulation]

Learning not to share [large-scale discrete event simulation...

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： J. Liu D. Nicol Department of Computer Science Dartmouth College Hanover NH USA

ISBN: (纸本)076951104X

Strong reasons exist for executing a large-scale discrete-event simulation on a cluster of processor nodes (each of which may be a shared-memory multiprocessor or a uniprocessor). This is the architecture of the largest scale parallel machines, and so the largest simulation problems can only be solved this way. It is a common architecture even in less esoteric settings, and is suitable for memory-bound simulations. This paper describes our approach to porting the SSF simulation kernel to this architecture, using the Message Passing Interface (MPI) system. The notable feature of this transformation is to support an efficient two-level synchronization and communication scheme that addresses cast discrepancies between shared-memory and distributed memory. In the initial implementation, we use a globally synchronous approach between distributed-memory nodes, and an asynchronous shared-memory approach within a SMP cluster. The SSF API reflects inherently shared-memory, assumptions; we report therefore on our approach for porting an SSF kernel to a cluster of SMP nodes. Experimental results on two architectures are described, for a model of TCP/IP traffic flows over a hierarchical network. The performance on a distributed network of commodity SMPs connected through ethernet is seen to frequently exceed performance on a Sun shared-memory multiprocessor.

关键词： Large-scale systems Discrete event simulation Kernel parallel machines Message passing TCPIP Telecommunication traffic Traffic control Ethernet networks Sun

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Speedup of a sparse system simulation

Speedup of a sparse system simulation

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： J. Nutaro H. Sarjoughian Arizona Center for Integrative Modeling and Simulation University of Arizona Tucson USA

ISBN: (纸本)076951104X

Optimistic and conservative simulation algorithms have been effective for speeding up the execution of many simulation programs. Event stepped techniques have also been shown to be effective for certain types of problems. This paper presents a conjecture that sparse systems are effectively simulated by conservative and optimistic techniques, where sparseness is characterised by the ratio of output generating states to non-output generating states. The speedup results for a representative sparse simulation are shown to support this conjecture.

关键词： Character generation Discrete event simulation Discrete event systems State-space methods World Wide Web Concrete Heart Continuous time systems Clocks

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The resource sharing system: dynamic federate mapping for HLA-based distributed simulation

The resource sharing system: dynamic federate mapping for HL...

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： J. Luthi S. Grossmann Institut für Technische Informatik Universität der Bundeswehr Munich Neubiberg Germany

ISBN: (纸本)076951104X

Networks of workstations have become a popular architecture for distributed simulation due to their high availability as opposed to specialized multiprocessor computers. Networks of workstations are also a well-suited framework for distributed simulation systems based on the High Level Architecture (HLA). However using workstations in a distributed simulation system may eventually affect the availability of computing resources for the users who need their computers as working tools. Thus, for coarse grained distributed simulation it may be desirable to let the users control to what extent their workstations should participate in a distributed simulation. The authors present a resource sharing system (RSS) that provides a client user interface on each potentially participating workstation. With the RSS clients, users of workstations can control the availability of their computer for the HLA simulation federation. An RSS manager keeps track of available computing resources and balances the participating HLA federates among the available workstations.

关键词： Resource management Workstations Computational modeling Computer simulation Availability distributed computing Computer architecture Computer networks Discrete event simulation User interfaces

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Optimistic simulation of parallel message-passing applications

Optimistic simulation of parallel message-passing applicatio...

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： T. Phan R. Bagrodia Computer Science Department University of California Los Angeles Los Angeles CA USA

ISBN: (纸本)076951104X

Optimistic techniques can improve the performance of discrete-event simulations, but one area where optimistic simulators have been unable to show performance improvement is in the simulation of parallel programs. Unfortunately, parallel program simulation using direct execution is difficult: the use of direct execution implies that the memory and computation requirements of the simulator are at least as large as that of the target application which restricts the target systems and application problem sizes that can be studied. Memory usage is especially important for optimistic simulators due to the need for periodic state-saving and rollback. In our research we addressed this problem and have implemented a simulation library running a Time-Warp-based optimistic engine that uses direct execution to simulate and predict the performance of parallel MPI program while attaining good simulation speedup. For program with data sets too large to be directly executed with our optimistic simulator, we reduced the memory and computational needs of these programs by utilizing a static task graph and code-slicing methodology an approach which also exhibited good performance speedup.

关键词： Computational modeling Engines Application software Optimization methods Computer architecture Concurrent computing Communication system control Computer science Computer simulation Predictive models

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Using quad trees for parallelizing conflict detection in a sequential simulation

Using quad trees for parallelizing conflict detection in a s...

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： F. Wireland D. Carnes G. Schultz Center for Adv. Aviation Syst. Dev. Mitre Corp. McLean VA USA Center for Advanced Aviation Systems Development The MITRE Corporation McLean VA USA

ISBN: (纸本)076951104X

The paper describes a parallel proximity detection algorithm and illustrates its application to the problem of conflict detection in an aviation simulation. The algorithm invokes a previously designed sequential function in parallel, using spatial information acquired during the traversal of a quad tree, to keep the separate invocations of the function as independent as possible. The method is general applicable to any function (not just conflict detection) whose arguments are spatially organized. Empirical results show that a single-threaded version of the algorithm sped up the simulation by 57%, while a four-threaded parallel version extracted 30% of the remaining additional speedup. These results are even more noteworthy, given that the architecture of the simulation remains intact; we only replace the invocation mechanism for one function.

关键词： Air traffic control Logic Computer architecture Object detection Aircraft Detection algorithms Graphics Filters Concurrent computing Pervasive computing

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Spatio-temporal correlations and rollback distributions in optimistic simulations

Spatio-temporal correlations and rollback distributions in o...

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： B.J. Overeinder A. Schoneveld P.M.A. Sloot Faculty of Science Section Computational Science University of Amsterdam Amsterdam Netherlands

ISBN: (纸本)076951104X

In this paper we study the influence of spatio-temporal correlations on the dynamic runtime behavior of the optimistic parallel Time Warp simulation method. By using the Ising spin model, we show experimentally that the distribution of the number of rolled back events behaves as a power-law distribution over a large range of sub-critical Ising temperatures and decays exponentially or super-critical Ising temperatures. For critical Ising temperatures, where long-range correlations occur the computational complexity, of Time Warp and physical complexity of the Ising spin model are entangled and contribute both to the runtime behavior in a nonlinear way.

关键词： Vehicle dynamics Computational modeling Biological system modeling Runtime Time warp simulation Discrete event simulation Temperature distribution Earthquakes Histograms Design optimization

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Cluster computing vs. Cray T3E-a case study from numerical field theory

Cluster computing vs. Cray T3E-a case study from numerical f...

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Euromicro workshop on parallel and distributed Processing

作者： G. Arnold N. Eicker T. Lippert K. Schilling Department of Physics University of Wuppertal Wuppertal Germany

ISBN: (纸本)0769509878

We compare the performance of a simulation code for lattice quantum electrodynamics, running on the cluster computer ALiCE (Alpha-Linux-Cluster-Engine) and the Cray T3E-1200 system. We present results from simulations using the novel parallelized multicanonical hybrid Monte Carlo algorithm. We merge multicanonical simulation techniques with the hybrid Monte Carlo algorithm to achieve a parallel scheme, and thus to be able to fight the notorious metastabilities by use of high performance parallel computers. We demonstrate for this application field that ALiCE is superior to the Cray T3E-1200 by factors of about 1.3 to 2.

关键词： Computational modeling Computer simulation Quantum computing Monte Carlo methods Clustering algorithms Lattices Electrodynamics Metastasis Concurrent computing High performance computing

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