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

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Dynamic load balancing of a multi-cluster simulator on a network of workstations 95

Dynamic load balancing of a multi-cluster simulator on a net...

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proceedings of the ninth workshop on parallel and distributed simulation

作者： Rolf Schlagenhaft Martin Ruhwandl Christian Sporrer Herbert Bauer Institute of Electronic Design Automation Department of Electrical Engineering Technical University of Munich 80290 Munich Germany Newbridge Networks 600 March Road P.O. Box 13600 Kanata Ontario Canada K2K 2E6

ISBN: (纸本)9780818671203

Performance of Time Warp simulation systems are often measured on exclusively available parallel computing resources. In distributed systems exclusive use is normally not feasible. Instead, due to the multi-tasking operating systems, many users share the workstations and their availability for parallel simulation purposes varies extensively. Time Warp has been found to be very sensitive to variations in available processing power. This paper presents two methods for a Time Warp VLSI simulation system to reduce the negative effect of a non-ideal environment on the execution of parallel simulations. A dynamic load balancing algorithm which adapts to the change of available processing power is presented. This mechanism, together with a multi-cluster partitioning technique significantly improve the performance of Time Warp based simulation systems on heterogeneous computing resource.

关键词： logic CAD multi-cluster simulator workstations network multi-tasking operating systems resource allocation time warp VLSI simulation system circuit analysis computing time warp simulation logic design time warp simulation systems multi-cluster partitioning technique discrete event simulation dynamic load balancing dynamic load balancing algorithm distributed processing heterogeneous computing resources distributed systems integrated circuit design VLSI

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Modelling of object based systems with hidden sorted ECATNets

Modelling of object based systems with hidden sorted ECATNet...

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International Symposium on Modeling, Analysis and simulation of Computer and Telecommunication Systems (MASCOTS)

作者： M. Bettaz M. Maouche Institute of Computing Science University of Constantine Algeria

ECATNets are a kind of high-level net/data model, combining the strengths of Petri nets with those of abstract data types, used for modeling parallel and distributed systems. Their most distinctive feature is that their semantics is defined in terms of rewriting logics, thus allowing us to analyse the built models by prototyping. However a major drawback of this approach is that the achieved prototypes suffer from a lack of efficiency during their execution. The objective of this paper is to palliate this lack by introducing the concept of hidden sorted ECATNets, a combination of net/object model allowing to "hide" (object) internal states, and then to get more rapid prototypes.< >

关键词： Prototypes Concurrent computing distributed computing Data models Data structures Logic design Petri nets Formal specifications

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Predicting the future: resource requirements and predictive optimism 95

Predicting the future: resource requirements and predictive ...

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proceedings of the ninth workshop on parallel and distributed simulation

作者： Bradley L. Noble Roger D. Chamberlain Computer and Communications Research Center Washington University St. Louis Missouri

ISBN: (纸本)9780818671203

The partitioning of systems for parallel simulation is a complex task, requiring consideration of both computational load requirements and communications activity. Typically, this information is not accurately known prior to execution. This paper investigates the use of historical information for the prediction of future requirements, both for computation and communications. In addition, for optimistic simulation algorithms, we present a novel technique (which we call predictive optimism) whereby binary prediction schemes can be used to increase the accuracy of optimistic assumptions, thereby decreasing rollbacks and potentially improving overall simulator performance.

关键词： resource allocation overall simulator performance historical information binary prediction schemes processor scheduling parallel simulation computational load requirements rollbacks future requirements optimistic simulation algorithms parallel programming communications activity discrete event simulation resource requirements message passing predictive optimism

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A tool for optimizing large scale parallel applications

A tool for optimizing large scale parallel applications

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International Symposium on Modeling, Analysis and simulation of Computer and Telecommunication Systems (MASCOTS)

作者： O. Hansen J. Krammer Lehrstuhl fuür Rechnertechnik und Rechnerorganisation Institut fuür Informatik Technische Universität München Munchen Germany

Developments in the field of supercomputing during the last couple of years showed that new classes of applications (The Grand Challenges) gain in importance that demand for new dimensions in computing power. The development of efficient parallel programs has to be supported in all phases of the program design and coding. This paper introduces a tool that supports the optimization of programs on massively parallel computing systems. The tool is scalable with respect to its implementation and in the way it presents performance data. A major feature contributing to the scalable representation of performance data is the ability to focus measurements on points of interest in the program execution by specifying behavioral attributes. Behavioral attributes are given as thresholds to the results of other measurements. Thus a direct link between results of different measurements can be made which enables the user to link global system behavior to the execution of individual program parts. With regard to the implementation, it is shown how the distributed measurement evaluation and the on-line mode of operation enable the tool to handle the problems of tools for massively parallel computing platforms.< >

关键词： Large-scale systems Time measurement Delay Concurrent computing parallel processing Current measurement User interfaces Volume measurement Displays Monitoring

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A fast asynchronous GVT algorithm for shared memory multiprocessor architectures 95

A fast asynchronous GVT algorithm for shared memory multipro...

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proceedings of the ninth workshop on parallel and distributed simulation

作者： Z. Xiao F. Gomes B. Unger J. Cleary University of Calgary Canada University of Waikato New Zealand

ISBN: (纸本)9780818671203

The computation of Global Virtual Time is of fundamental importance in Time Warp based parallel Discrete Event simulation Systems. Shared memory multiprocessor architectures can support interprocess communication with much smaller overheads than distributed memory systems. This paper presents a new, completely asynchronous, Gvt algorithm which provides very fast and accurate Gvt estimation with significantly lower overhead than previous approaches. The algorithm presented is able to support more efficient memory management, termination, and other global control *** Gvt algorithm described enables any Time Warp entity to compute Gvt at any time without slowing down other entities, in particular, those executing on the critical path. Experimental results are presented for a shared memory Time Warp system that employs a two tiered distributed memory management *** proof of the correctness and the accuracy of the algorithm are also presented. Finally, some suggestions on possible further optimization of the implementation are given.

关键词： discrete event simulation Global Virtual Time shared memory systems distributed memory management shared memory multiprocessor Time Warp storage management time warp simulation distributed memory systems memory management Discrete Event simulation GVT algorithm

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Super-criticality revisited 95

Super-criticality revisited

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proceedings of the ninth workshop on parallel and distributed simulation

作者： Sudhir Srinivasan Paul F. Reynolds Department of Computer Science University of Virginia Thornton Hall Charlottesville VA

ISBN: (纸本)9780818671203

Critical path analysis has been suggested as a technique for establishing a lower bound on the completion times of parallel discrete event simulations. A protocol is super-critical if there is at least one simulation that can complete in less than the critical path time using that protocol. Previous studies have shown that several practical protocols are super-critical while others are not. We present a sufficient condition to demonstrate that a protocol is super-criticality. It has been claimed that super-criticality requires independence of one or more messages (states) on events in the logical past of those messages (states). We present an example which contradicts this claim and examine the implications of this contradiction on lower bounds.

关键词： parallel discrete event simulations critical path analysis protocols lower bound discrete event simulation protocol

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A case study in simulating PCS networks using Time Warp 95

A case study in simulating PCS networks using Time Warp

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proceedings of the ninth workshop on parallel and distributed simulation

作者： Christopher D. Carothers Richard M. Fujimoto Yi-Bing Lin College of Computing Georgia Institute of Technology Atlanta Georgia Bellcore Morristown New Jersey

ISBN: (纸本)9780818671203

There has been rapid growth in the demand for mobile communications over the past few years. This has led to intensive research and development efforts for complex PCS (personal communication service) networks. Capacity planning and performance modeling is necessary to maintain a high quality of service to the mobile subscriber while minimizing cost to the PCS provider. The need for flexible analysis tools and the high computational requirements of large PCS network simulations make it an excellent candidate for parallel ***, we describe our experiences in developing two PCS simulation models on a general purpose distributed simulation platform based on the Time Warp mechanism. These models utilize two widely used approaches to simulating PCS networks: (i) the call-initiated and (ii) the portable-initiated models. We discuss design decisions that were made in mapping these models to the Time Warp executive, and characterize the workloads resulting from these models in terms of factors such as communication locality and computation granularity. We then present performance measurements for their execution on a network of workstations. These measurements indicate that the call-initiated model generally outperforms the portable initiated model, but is not able to capture phenomenon such as the “busy line” effect. Moreover, these studies indicate that the high locality in large-scale PCS network simulations make them well-suited for execution on general purpose parallel and distributed simulation platforms.

关键词： time warp discrete event simulation performance measurements flexible analysis tools personal communication service telecommunication computing PCS networks parallel distributed mobile communications simulation platforms time warp simulation mobile communication

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An algorithm for speculative parallel execution of rendezvous-synchronized simulation 95

An algorithm for speculative parallel execution of rendezvou...

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proceedings of the ninth workshop on parallel and distributed simulation

作者： Bruno R. Preiss Department of Electrical and Computer Engineering University of Waterloo Waterloo Ontario Canada N2L 3G1

ISBN: (纸本)9780818671203

This paper presents an approach for speculative parallel execution of rendezvous-synchronized simulations. Rendezvous-synchronized simulation is based on the notions of processes and gates and on the rendezvous mechanism defined in the basic process algebra of LOTOS—a standard formal specification language for temporal ordering[2]. Time is introduced via a mechanism similar to the delay behaviour annotation provided by the TOPO toolset[4-6].The algorithm allows speculative gate activations. This increases the available parallelism while ensuring correct execution of the *** model is used to describe closed stochastic queueing network simulations. Analysis of their execution results suggests that the model makes available a promising degree of parallelism.

关键词： temporal ordering rendezvous-synchronized simulation TOPO toolset delay behaviour annotation speculative gate activations LOTOS parallel algorithms formal specification closed stochastic queueing network simulations digital simulation stochastic processes queueing theory formal specification language specification languages speculative parallel execution process algebra

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The use of the national information infrastructure and high performance computers in industry

The use of the national information infrastructure and high ...

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International Conference on Massively parallel Processing Using Optical Interconnections

作者： G.C. Fox W. Furmanski Northeast Parallel Architectures Center Syracuse University Syracuse NY USA

We divide potential NII (National Information Infrastructure) services into five broad areas: Collaboration and televirtuality; InfoVISiON (Information, Video, Imagery, and simulation on Demand), and digital libraries; commerce; metacomputing; WebTop productivity services. The latter denotes the broad suite of tools we expect to be offered on the Web in a general environment we term WebWindous. We review current and future World Wide Web technologies, which could underlie these services. In particular we suggest an integration framework WebWork for high performance (parallel and distributed) computing and the NII. We point out that pervasive WebWork and WebWindows technologies will enable, facilitate and substantially accelerate such complex software processes on the NII. We briefly analyze seven broad application areas: society; business enterprises; health care; defense command and control, and crisis management; education; collaboratory; manufacturing. We contrast their use of NII services with a more detailed examination of the manufacture of complex systems, such as aircraft and automobiles. This application stresses the NII but there is a remarkable opportunity to develop new manufacturing practices that offer cost savings and reduced time to market.

关键词： Automobile manufacture Collaboration Video on demand Software libraries Business Metacomputing Productivity Web sites Concurrent computing distributed computing

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Global Virtual Time and distributed synchronization 95

Global Virtual Time and distributed synchronization

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proceedings of the ninth workshop on parallel and distributed simulation

作者： Jeffrey S. Steinman Craig A. Lee Linda F. Wilson David M. Nicol Jet Propulation Laboratory California Inst. of Technology 4800 Oak Grove Drive Mail Stop 525-3960 Pasadena CA The Aerospace Corporation 2350 East E1 Segundo Blvd. Mail Stop M1-102 El Segundo CA ICASE NASA Langley Research Center Mail Stop 132C Hampton VA College of William and Mary Dept. of Computer Science Williamsburg VA

ISBN: (纸本)9780818671203

Global Virtual Time (GVT) is the fundamental synchronization concept in optimistic simulations. It is defined as the earliest time tag within the set of unprocessed pending events in distributed simulation. A number of techniques for determining GVT have been proposed in recent years, each having their own intrinsic properties. However, most of these techniques either focus on specific types of simulation problems or assume specific hardware support. This paper specifically addresses the GVT problem in the context of the following area• Scalability• Efficiency• Portability• Flow control• Interactive support•Real time useA new GVT algorithm, called SPEEDES GVT, has been developed in the Synchronous parallel Environment for Emulation and Discrete-Event simulation (SPEEDES) framework. The new algorithm runs periodically but does not disrupt event processing. It provides flow control by processing events risk-free while flushing out messages during the GVT computation. SPEEDES GVT is built from a set of global reduction operations that are easily implementable on any hardware system.

关键词： flow control SPEEDES GVT software fault tolerance global reduction operations parallel programming Synchronous parallel Environment for Emulation and Discrete-Event simulation framework message passing scalability event processing SPEEDES framework real time use interactive support distributed simulation optimistic simulations unprocessed pending events real-time systems portability efficiency global virtual time distributed synchronization synchronisation fundamental synchronization concept digital simulation GVT computation

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