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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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Stack-free process-oriented simulation 97

Stack-free process-oriented simulation

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proceedings of the eleventh workshop on parallel and distributed simulation

作者： C. J. M. Booth D. I. Bruce Defence Evaluation and Research Agency St. Andrews Road Malvern WORCS WR14 3PS UK

ISBN: (纸本)9780818679650

The process interaction world view is widely used in the general simulation community for its expressive power, and is supported by most modern simulation languages. In parallel discrete event simulation, however, its use remains comparatively rare due to the perceived inefficiency (and difficulty) of parallel *** present a new implementation strategy for parallel process-oriented simulation languages. This innovative, semantics-based approach directly addresses two common concerns of such languages. By concentrating on the intrinsic threads of control, we avoid the proliferation of simulation objects (and their associated costs) that might result from a naive translation. More fundamentally, the primary costs associated with process-oriented languages -- those of context switching between stacks and, in an optimistic setting, of saving the state of these stacks -- are entirely eliminated since our explicit use of continuations avoids the need for stacks in the first place. We similarly obtain cheap and natural thread preemption.

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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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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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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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A static partitioning and mapping algorithm for conservative parallel simulations 94

A static partitioning and mapping algorithm for conservative...

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proceedings of the eighth workshop on parallel and distributed simulation

作者： Azzedine Boukerche Carl Tropper School of Computer Science McGill University Montreal Canada

ISBN: (纸本)9781565550278

In this paper, we consider the problem of partitioning a conservative parallel simulation for execution on a multi-computer. The synchronization protocol makes use of null messages [6]. We propose the use of a simulated annealing algorithm with an adaptive search schedule to find good (sub-optimal) partitions. The paper discusses the algorithm, its implementation and reports on the performance results of simulations of a partitioned FCFS queueing network model executed on iPSC/860 hypercube. The results obtained are compared with a random partitioning. They show that a partitioning which makes use of our simulated annealing algorithm results in a reduction of 25-35% of the running time of the simulations when compared to the running time of a random partition of the model.

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Lock-free scheduling of logical processes in parallel simulation 01

Lock-free scheduling of logical processes in parallel simula...

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proceedings of the fifteenth workshop on parallel and distributed simulation

作者： Jason Liu David M. Nicol King Tan Department of Computer Science Dartmouth College Hanover New Hampshire

ISBN: (纸本)9780769511047

With fixed lookahead information in a simulation model, the overhead of asynchronous conservative parallel simulation lies in the mechanism used for propagating time updates in order for logical processes to safely advance their local simulation clocks. Studies have shown that a good scheduling algorithm should preferentially schedule processes containing events on the critical path. This paper introduces a lock-free algorithm for scheduling logical processes in conservative parallel discrete-event simulation on shred-memory multiprocessor machines. The algorithm uses fetch & add operations that help avoid inefficiencies associated with using locks. The lock-free algorithm is robust. Experiments show that, compared with the scheduling algorithm using locks, the lock-free algorithm exhibits better performance when the number of logical processes assigned to each processor is small or when the workload becomes significant. In models with large number of logical processes, our algorithm shows only modest increase in execution time due to the overhead in the algorithm for extra bookkeeping.

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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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Site-based mapping for parallel proxy servers with fewer TCP connections

Site-based mapping for parallel proxy servers with fewer TCP...

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International Conference on distributed Computing Systems workshop

作者： K.Y. Wong K.F. Law K.H. Yeung Department of Electrical Engineering City University of Engineering Hong Kong China

There are many mapping schemes proposed in previous research on parallel proxy servers. The operations of these schemes are mainly URL-based, and therefore cannot fully benefit from the new persistent connection feature of HTTP/1.1. We propose a site-based mapping scheme that forwards all requests targeting on the same Web site to the same proxy server. The scheme then allows the proxy to use a single persistent connection to serve many client requests. The major advantage of the scheme is the reduction in the number of connection establishments. This reduction can save network bandwidth and reduce the user-experienced latency. simulation results show that the proposed site-based scheme reduces 40%-70% of the connection setups and teardowns when compared to a traditional URL-based mapping scheme.

关键词： distributed computing Conferences

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