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

共 1360 条记录，以下是621-630 订阅

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Load balancing for conservative simulation on shared memory multiprocessor systems

Load balancing for conservative simulation on shared memory ...

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workshop on Principles of Advanced and distributed simulation (PADS)

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

Load balancing is a crucial factor in achieving good performance for parallel discrete event simulations. We present a load balancing scheme that combines both static partitioning and dynamic load balancing. The static partitioning scheme maps simulation objects to logical processes before simulation starts while the dynamic load balancing scheme attempts to balance the load during runtime. The static scheme involves two steps. First, the simulation objects that contribute to small lookahead are merged together by using a merging algorithm. Then a partitioning algorithm is applied. The merging is needed to ensure a consistent performance for our dynamic scheme. Our dynamic scheme is tailor-made for an asynchronous simulation protocol that does not rely on null messages. The performance study on a supply chain simulation shows that the partitioning algorithm and dynamic load balancing are important in achieving good performance.

关键词： Load management Multiprocessing systems Protocols Electrical capacitance tomography Merging Partitioning algorithms Runtime Gallium nitride Virtual manufacturing Discrete event simulation

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A performance simulation technique for distributed programs: application to an SOR iterative solver

A performance simulation technique for distributed programs:...

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Euromicro workshop on parallel and distributed Processing

作者： R. Aversa B. Di Martino N. Mazzocca U. Villano Facoltà di Ingegneria Dipartimento di Ingegneria dell Informazione Second University of Naples Italy Facoltà di Ingegneria Informatica Università del Sannio Italy

ISBN: (纸本)0769505007

In this paper we present the application of an approach for the performance prediction of message passing programs, to a PVM code implementing an iterative solver based on the Successive OverRelaxation method. The approach, based on the integration of static program analysis and simulation techniques, is aimed at significantly speeding up the time needed for simulating the execution of a message passing program. We show how the proposed technique can provide, in a reasonable elaboration time, the user for a characterization of iterative regular programs as the proposed one, in terms of idle-, cpu-, communication and synchronization time in Heterogeneous and Network Computing environments.

关键词： Performance analysis Algorithm design and analysis Computational modeling Message passing Prototypes Concurrent computing Computer networks Iterative methods Software performance Writing

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Environment for performing collaborative distributed virtual environments with QoS

Environment for performing collaborative distributed virtual...

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International Conference on parallel and distributed Systems (ICPADS)

作者： Z. Choukair D. Retailleau M. Hellstrom Département Informatique ENST de bretagne Brest France

The spread of virtual environments is creating a new set of challenges in the management of system resources for guaranteeing quality of service (QoS). This paper describes an implementation of end-user QoS control to a distributed virtual environment platform called DVECOM. In particular, we describe how to guarantee mandatory properties, such as synchronization and consistency, how to reduce the impact on the application in case of a sudden overload in the system, and how we master this degradation to guarantee a smooth degradation according to the end-user's requirements. This representation degradation is driven by the user's choices and profile-selected through the offered rendering strategy API. We also present our evaluation of the QoS implementation, describing some interesting results we achieved in a simulation of collaborative work in the system.

关键词： Collaboration Quality of service Collaborative work Virtual environment Degradation Testing Collaborative software Displays Environmental management Quality management

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A case study of trace-driven simulation for analyzing interconnection networks: cc-NUMAs with ILP processors

A case study of trace-driven simulation for analyzing interc...

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Euromicro workshop on parallel and distributed Processing

作者： V. Puente J.M. Prellezo C. Izu J.A. Gregorio R. Beivide University of Cantabria Spain University of Adelaide Australia

ISBN: (纸本)0769505007

The evaluation of network performance under real application loads is carried out by detailed time-intensive and resource-intensive simulations. Moreover, the use of ILP (instruction-level parallel) processors in cc-NUMA (cache-coherent non-uniform memory access) architectures introduces non-deterministic memory accesses; the resulting parallel system must be modeled by a detailed execution-driven simulation, further increasing the evaluation cost. This paper introduces a simulation methodology, based on network traces, to estimate the impact that a given network has on the execution time of parallel applications. This methodology allows the study of the network design space with a level of accuracy close to that of execution-driven simulations but with much shorter simulation times. The network trace, extracted from an execution-driven simulation, is processed to substitute the temporal dependencies produced by the simulated network with an estimation of the message dependencies caused by both the application and the applied cache-coherent protocol. This methodology has been tested on two direct networks, with 16 and 64 nodes respectively, running the FFT and Radix applications of the SPLASH2 suite. The trace-driven simulation is 3 to 4 times faster than the execution-driven one, with an average error of 4% in the total execution time.

关键词： Computer aided software engineering Analytical models Multiprocessor interconnection networks Computational modeling Telecommunication traffic Traffic control Costs Predictive models Performance analysis Electronic mail

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Advanced distributed simulation: what we learned, where to go next

Advanced distributed simulation: what we learned, where to g...

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： W.H. Lunceford U.S. Army Model and Simulation Office Arlington VA USA

Summary form only given. It has been a little less than ten years since modeling and simulation (M&S) hit the knee on the curve. During these past few years a great deal of marketing of the potential of M&S has occurred, which resulted in a significant influx of funding for research and development (R&D) projects, especially in the area of distributed simulation. One of the significant experiments in this area-the DARPA Synthetic Theater of War program-officially ended, bringing to an end one of the more robust experiments in distributed simulation. We are now in a time where most of the M&S funding is targeted at production programs, with much fewer dollars going into R&D or experimentation. Although it is good that major programs are capitalizing on previous R&D efforts, it would not be true to say that the necessary R&D has been completed to realize the vision of distributed simulation. It would be true to say that we now have a much better understanding of the issues. What is needed now is a period of reflection on the vision, where we are, what was done right, what hasn't worked well, and where we should be headed for the next five to ten years.

关键词： Research and development Modeling Atherosclerosis Knee Electrical capacitance tomography Production Research and development management Engineering management Systems engineering and theory Technology management

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Grain sensitive event scheduling in time warp parallel discrete event simulation

Grain sensitive event scheduling in time warp parallel discr...

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： F. Quaglia V. Cortellessa Dipartimento di Informatica e Sistemistica Università di Roma La Sapienza Rome Italy Dipartimento di Informatica Sistemi e Produzione Università di Roma Tor Vergata Rome Italy

Several scheduling algorithms have been proposed to determine the next event to be executed on a processor in a time warp parallel discrete event simulation. However none of them is specifically designed for simulations where the execution time (or granularity) for different types of events has large variance. We present a grain sensitive scheduling algorithm which addresses this problem. In our solution, the scheduling decision depends on both timestamp and granularity values with the aim at giving higher priority to small grain events even if their timestamp is not the lowest one (i.e. the closest one to the commitment horizon of the simulation). This implicitly limits the optimism of the execution of large grain events that, if rolled back, would produce a large waste of CPU time. The algorithm is adaptive in that it relies on the dynamic recalculation of the length of a simulated time window within which the timestamp of any good candidate event for the scheduling falls in. If the window length is set to zero, then the algorithm behaves like the standard Lowest-Timestamp-First (LTF) scheduling algorithm. simulation results of a classical benchmark in several different configurations are reported for a performance comparison with LTF: these results demonstrate the effectiveness of our algorithm.

关键词： Discrete event simulation Scheduling algorithm Frequency synchronization Time warp simulation Remuneration Electronic switching systems Clocks Sufficient conditions

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Performance analysis of k-ary n-cubes with fully adaptive routing

Performance analysis of k-ary n-cubes with fully adaptive ro...

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International Conference on parallel and distributed Systems (ICPADS)

作者： H. Sarbazi-Azad M. Ould-Khaoua L.M. Mackenzie Department of Computing Science University of Glasgow Glasgow UK Department of Computer Science University of Strathclyde Glasgow UK

Several analytical models of deterministic routing in wormhole-routed k-ary n-cubes have already been reported in the literature. The performance characteristics of most fully-adaptive routing algorithms have often been analyzed by means of simulation and there is hardly any analytical model proposed for calculating message latency in wormhole-routed k-ary n-cubes using adaptive routing. The paper proposes an accurate analytical model to predict the message latency in wormhole-routed k-ary n-cubes with fully adaptive routing. The proposed model is general in that it exhibits a good degree of accuracy for various network configurations and under different operating conditions.

关键词： Performance analysis Routing Analytical models Delay Telecommunication traffic Hypercubes Computer science distributed control Algorithm design and analysis Computational modeling

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ROSS: a high-performance, low memory, modular time warp system

ROSS: a high-performance, low memory, modular time warp syst...

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： C.D. Carothers D. Bauer S. Pearce Department of Computer Science Rensselaer Polytechnic Institute Troy NY USA

We introduce a new time warp system called ROSS: Rensselaer's Optimistic simulation System. ROSS is an extremely modular kernel that is capable of achieving event rates as high as 1,250,000 events per second when simulating a wireless telephone network model (PCS) on a quad processor PC server. In a head-to-head comparison, we observe that ROSS out performs the Georgia Tech Time Warp (GTW) system on the same computing platform by up to 180%. ROSS only requires a small constant amount of memory buffers greater than the amount needed by the sequential simulation for a constant number of processors. The driving force behind these high-performance and low memory utilization results is the coupling of an efficient pointer-based implementation framework, Fujimoto's (1989) fast GVT algorithm for shared memory multiprocessors, reverse computation and the introduction of kernel processes (KPs). KPs lower fossil collection overheads by aggregating processed event lists. This aspect allows fossil collection to be done with greater frequency, thus lowering the overall memory necessary to sustain stable, efficient parallel execution.

关键词： Kernel Computational modeling Computer simulation Discrete event simulation Time warp simulation Computer science Telephony Personal communication networks Network servers High performance computing

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Preliminary investigations into distributed computing applications on a Beowulf cluster

Preliminary investigations into distributed computing applic...

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International workshop/Symposium on distributed simulation and Real-Time Applications (DS-RT)

作者： G.A. Schiavone J. Tracy R. Palaniappan Institute for Simulation and Training University of Central Florida USA

We examine various modeling and simulation applications of cluster computing using a Beowulf cluster. These applications are used to investigate the performance of our cluster in terms of computational speedup, scalability, and communications. The applications include solution of linear systems by Jacobi iteration, distributed image generation, and the finite difference time domain solution of Maxwell's equations. It is observed that the computational load for these applications must be large compared to the communication overhead to take advantage of the speedup obtained using parallel computing. For the applications reviewed, this condition is increasingly satisfied as the problem size becomes larger or as higher resolution is required.

关键词： distributed computing Computational modeling Computer applications Scalability Linear systems Jacobian matrices Image generation Finite difference methods Maxwell equations Concurrent computing

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Analytic performance model for speculative, synchronous, discrete-event simulation 00

Analytic performance model for speculative, synchronous, dis...

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proceedings of the fourteenth workshop on parallel and distributed simulation

作者： Bradley L. Noble Roger D. Chamberlain

No abstract available.

ISBN: (纸本)9780769506678

No abstract available.

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