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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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Synchronous relaxation for parallel Ising spin simulations 01

Synchronous relaxation for parallel Ising spin simulations

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proceedings of the fifteenth workshop on parallel and distributed simulation

作者： Boris Lubachevsky Alan Weiss Bell Labs 600 Mountain Avenue Murray Hill New Jersey

ISBN: (纸本)9780769511047

A new parallel algorithm for simulating Ising spin systems is presented. The sequential prototype is the n-fold way algorithm [2], which is efficient but is hard to parallelize using conservative methods. Our parallel algorithm is optimistic. Unlike other optimistic algorithms, e.g., Time Warp, our algorithm is synchronous. It also belongs to the class of simulations known as “relaxation” [3]; hence it is named “synchronous relaxation.” We derive performance guarantees for this algorithm. If N is the number of PEs, then under weak assumptions we show that the number of correct events processed per unit of time is, on average, at least of order N/ log N. All communication delays, processing time, and busy waits are taken into account.

关键词： Metropolis algorithm conservative simulation optimistic simulation computational physics

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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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Optimistic simulation of parallel message-passing applications 01

Optimistic simulation of parallel message-passing applicatio...

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proceedings of the fifteenth workshop on parallel and distributed simulation

作者： Thomas Phan Rajive Bagrodia The University of California at Los Angeles Computer Science Department Los Angeles CA

ISBN: (纸本)9780769511047

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 programs while attaining good simulation speedup. For programs 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.

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parallel image analysis on recursive Torus architecture

Parallel image analysis on recursive Torus architecture

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1993 Computer Architectures for Machine Perception, CAMP 1993

作者： Matsuyama, T. Asada, N. Aoyama, M. Department of Information Technology Okayama University Okayama700 Japan

ISBN: (纸本)0818654201

The authors describe a new parallel image understanding machine RTA/1 design based on the recursive Torus architecture, and proposed a data level parallel processing scheme using parallel data structures. Various types of parallel image analysis algorithms were developed to demonstrate the effectiveness of both RTA/1 and the parallel data structures. The performance of all algorithms were evaluated by simulation and it was shown that about two order of magnitude speed-up can be attained by using 32 × 32 PE tours. The five types of parallel data structures described here are only fundamental ones and one needs to explore new distributed data representations and coordinated communication procedures to increase the flexibility, utility, and efficiency of the parallel processing on RTA/1. The Pascal like notation used to describe the parallel data structures and algorithms is to be improved to a complete parallel programming language. However the development of the parallel programming language should follow the investigation of the control level parallel processing on RTA/1, since parallel image understanding systems require both data and control level parallel processing capabilities. © 1993 IEEE.

关键词： Image analysis

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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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Estimating the cost of throttled execution in time warp 96

Estimating the cost of throttled execution in time warp

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proceedings of the tenth workshop on parallel and distributed simulation

作者： Samir R. Das Division of Computer Science The University of Texas at San Antonio San Antonio TX

ISBN: (纸本)9780818675393

Over-optimistic execution has long been identified as a major performance bottleneck in Time Warp based parallel simulation systems. An appropriate throttle or control of optimism can improve performance by reducing the number of rollbacks. However, the design of an appropriate throttle is a difficult task, as correct computations on the critical path may be blocked, thus increasing the overall execution time. In this paper we build a cost model for throttled execution that involves both rollback probability and probability for an event computation being on the critical path. The model can estimate an appropriate size of time window for a throttled execution using statistics collected from the purely optimistic execution. The model is validated by an experimental study with a set of synthetic workloads.

关键词： time warp discrete event simulation performance model parallel simulation

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Genesis: a system for large-scale parallel network simulation 02

Genesis: a system for large-scale parallel network simulatio...

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proceedings of the sixteenth workshop on parallel and distributed simulation

作者： Boleslaw K. Szymanski Adnan Saifee Anand Sastry Yu Liu Kiran Madnani RPI Troy NY

ISBN: (纸本)9780769516080

We describe a novel approach to scalability and efficiency of parallel network simulation that partitions the networks into domains and simulation time into intervals. Each domain is simulated independently of and concurrently with the others over the same simulation time interval. At the end of each interval, packet delays and drop rates for each inter-domain flow are exchanged between domain simulators. The simulators iterate over the same time interval until the exchanged information converges to a constant value within the prescribed precision. After convergence, all the domain simulators progress to the next time interval. This approach allows the parallelization with infrequent *** biggest challenge for this method is to ensure iteration convergence for protocols, such as TCP, that adjust source rate to the current network conditions. The main contribution of this paper is to demonstrate that by judicious design of the domain processing and information exchange, the proposed approach efficiently parallelizes network simulation with TCP flows.

关键词： Scalable Partition Synchronization simulation Domain parallel Network

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A simulation environment for ad hoc networks using sector subdivision

A simulation environment for ad hoc networks using sector su...

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Euromicro Conference on parallel, distributed and Network-Based Processing

作者： K. Volbert Heinz Nixdorf Institute and Department of Mathematics and Computer Science University of Paderborn Germany

ISBN: (纸本)0769514448

A new model for communication in MANET is presented: Instead of omnidirectional transmissions, as assumed in most papers and all existing systems, the members are allowed to submit data in a fixed number of different directions (sector subdivision) and to adjust the transmission power in each sector separately. A simulation environment (simulation environment for ad hoc networks, SAHNE) is presented that allows simulation of communication strategies in MANET that use sector subdivision, and simulation results are shown where communication paths are selected via hop-minimization or geometric spanner properties. SAHNE is based on C++ and common libraries, which ensures that it can be used on many different platforms. The experiments show the influence of different parameters in realistic scenarios, and using geometric routing seemed to be better than using hop-minimization.

关键词： Ad hoc networks Mobile communication Solid modeling Mobile ad hoc networks Routing protocols Frequency Batteries Prototypes Computational modeling Mathematics

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Lookahead revisited in wireless network simulations 02

Lookahead revisited in wireless network simulations

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proceedings of the sixteenth workshop on parallel and distributed simulation

作者： Jason Liu David M. Nicol Dartmouth College Hanover NH

ISBN: (纸本)9780769516080

Rapid growth in wireless communication systems motivates the development of technology supporting the simulation of large-scale wireless systems. However, it is widely recognized that wireless communications do not have substantial "lookahead" needed by conservative synchronization protocols. This paper focuses on identifying and exploiting lookahead for such models. We find lookahead in three ways, exploiting characteristics of low power networks, the transceiver logic, and the way in which protocol stacks are typically constructed. We show how these observations allow a variety of conservative synchronization protocols to take advantage of lookahead, describe a synchronization method we use, and empirically examine the performance this method offers on a large-scale simulation of a sensor network intended for homeland defense scenarios

关键词： performance conservative parallelsimulation synchronization sensor networks. parallel simulation parallel discrete-event simulation wireless networks ad hoc networks lookahead

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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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