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

共 1276 条记录，以下是411-420 订阅

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Enhancing the DiffServ architecture of a simulation environment 6

Enhancing the DiffServ architecture of a simulation environm...

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6th IEEE International workshop on distributed simulation and Real-Time Applications (DS-RT 2002)

作者： Bouras, C Primpas, D Sevasti, A Varnavas, A RACTI Patras 26221 Greece

ISBN: (纸本)0769518532

simulation has always been a valuable tool for experimentation and validation of models, architectures and mechanisms in the, field of networking. In the case of the DiffServ framework, simulation is even more valuable, due to the fact that an analytical approach of mechanisms and services is infeasible because of the aggregation and multiplexing of flows. In this work, we have extended the functionality of a widely used simulation environment towards the direction of realistic traffic generation and a series of mechanisms defined by the DiffServ architecture. The modules created are being presented and a case study of a simulation scenario that exploits the functionality provided by them is described.

关键词： Aggregates Communication system traffic control Computational modeling Computer architecture Computer networks Computer simulation Diffserv networks Informatics Testing Traffic control

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Experiences applying parallel and interoperable network simulation techniques in on-line simulations of military networks 16

Experiences applying parallel and interoperable network simu...

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16th workshop on parallel and distributed simulation

作者： Perumalla, K Fujimoto, R McLean, T Riley, G Georgia Inst Technol Coll Comp Atlanta GA 30332 USA

ISBN: (纸本)0769516084

We present a case study in which we apply parallel simulation methods and interoperability techniques to network simulations for simulation-based on-line control of military communication networks. The on-line simulations model actual military networks, including wired shipboard sub-networks connected via satellite links, and wireless mobile devices. The modeled scenario depicts the communication requirements of an amphibious landing where a complex network connects troops ashore and naval vessels. The simulations use a heterogeneous set of tools, including ns2 models for shipboard wired networks, and GloMoSim models for the wireless devices. In this paper, we document the challenges we encountered in applying parallel and interoperable simulation methods, and describe our solutions. We describe our experiences in addressing the interoperability problems that naturally arose due to the heterogeneity of scenario models. We also present a preliminary study on the scalability of real-time performance of parallel network simulations, which is crucial for on-line simulations. Salient system characteristics of the subject military network scenarios are described for the benefit of exposure to the modeling and simulation research community. Our exercise not only highlights the relevance of parallel and distributed simulation techniques to an important real-life problem, but also demonstrates the feasibility of applying those techniques in a practical setting.

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Addressing blocking and scalability in Critical Channel Traversing 16

Addressing blocking and scalability in Critical Channel Trav...

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16th workshop on parallel and distributed simulation

作者： Simmonds, R Kiddle, C Unger, B Univ Calgary Dept Comp Sci Calgary AB Canada

ISBN: (纸本)0769516084

This paper presents two new versions of the Critical Channel Traversing (CCT) algorithm. CCT is a conservative parallel discrete event simulation algorithm that has been shown to achieve very high performance when used in a wide area computer network simulator The first of the new algorithms called simple sender side CCT is similar to the original, but busy waiting is eliminated. Results presented show that simple sender side CCT avoids performance problems that can be caused by busy waiting. The second new algorithm called receive side CCT employs a different strategy for updating channel clocks and determining which objects should be scheduled on critical channels. Performance results show that this version provides better scaling with respect to the connectivity of the model, at the expense of some added complexity.

关键词： parallel discrete event simulation conservative algorithms performance

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Conservative simulation using distributed-shared memory 16

Conservative simulation using distributed-shared memory

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16th workshop on parallel and distributed simulation

作者： Teo, YM Ng, YK Onggo, BSS Natl Univ Singapore Dept Comp Sci Singapore 117543 Singapore

ISBN: (纸本)0769516084

This paper focuses on conservative simulation using distributed-shared memory for inter-processor communication. JavaSpaces, a special service of Java Jini, provides a shared persistent memory for simulation message communication among processors. Two benchmark programs written using our SPaDES/Java parallel simulation library are used. The first program is a linear pipeline system representing a loosely-coupled open system. The PHOLD program represents a strongly-connected closed system. Experiments are carried out using a cluster of Pentium II PCs. We used a combination of Wood Turner carrier null, flushing and demand-driven algorithms for null message synchronization. To optimize message communication, we replace SPaDES/Java inter-processor communication implemented using Java's Remote Method Invocation (RMI) with one JavaSpace. For PHOLD (16x16, 16) running on eight processors, this change reduces simulation runtime by more than half, null message overhead reduces by a further 15%, and event rate more than doubled. Based on our memory analysis methodology, the memory, cost of null message synchronization for PHOLD is less than 9% of the total memory needed by, the simulation.

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Software control systems for parallel simulation 16

Software control systems for parallel simulation

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16th workshop on parallel and distributed simulation

作者： Radhakrishnan, R Wilsey, PA Expt Comp Lab Cincinnati OH 45221 USA

ISBN: (纸本)0769516084

parallel simulations using optimistic synchronization strategies such as Time Warp, operate with no regard to global synchronization since this results in greater parallelism and lower synchronization cost. However, like virtual memory, the parallel simulators may end up thrashing instead of performing useful work. The complication in using a Time Warp simulator is then to configure it suitably for good performance and avoid thrashing. Unfortunately, the optimal configuration is not generally static among different applications or even throughout an entire run of a single application. Thus, online feedback control systems are deployed to govern the adjustment of input parameters in our Time Warp simulation kernel. The design and implementation of effective feedback control systems can be difficult;the extra processing is pure overhead that must be absorbed by an), performance gains delivered. The problem is further complicated when attempting to build a simulation kernel that is designed efficiently to operate with many different applications. In this paper, we introduce a control-centric architecture that is used to monitor and manage different parts of a Time Warp simulator Specifically, we extend concepts from control theory such as adaptive control and stability, to better understand and design hierarchically-distributed run-time control systems for Time Marp based parallel simulation.

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distributed simulation of timed coloured Petri nets 6

Distributed simulation of timed coloured Petri nets

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6th IEEE International workshop on distributed simulation and Real-Time Applications (DS-RT 2002)

作者： Furfaro, A Nigro, L Pupo, F Univ Calabria Dipartimento Elettr Informat & Sistemist Lab Ingn Software I-87036 Cosenza Italy

ISBN: (纸本)0769518532

This paper introduces a Coloured Petri Nets formalism -TCPN- which is suitable for modelling and simulation of complex systems. Novel in TCPN is (i) a timing model which accommodates both unordered and ordered (queue) places;(ii) the adoption of Java as the net inscription language. TCPN is supported by a graphical tool RAINBOW - which allows model design, testing and simulation. A large TCPN model can be split into regions (subnets) whose execution is assigned to different LP/processors of a networked simulator. distributed simulation relies on TUTW an agent-based Time Warp algorithm capable of exploiting temporal uncertainty for improving simulation performance. The paper describes TCPN and its distributed execution kernel. The practical use of TCPN is demonstrated through an example and some experimental results.

关键词： Analytical models Discrete event simulation Java Kernel Performance analysis Petri nets Testing Time warp simulation Timing Uncertainty

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distributed object-oriented real-time simulation of the multicast protocol RFRM 7

Distributed object-oriented real-time simulation of the mult...

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7th IEEE International workshop on Object-Oriented Real-Time Dependable Systems (WORDS 2002)

作者： Hong, YS Dongguk Univ Seoul South Korea

ISBN: (纸本)0769515762

A real-time fault-tolerant multicast protocol is necessary for obtaining high performance in operating distributed real-time computing systems. The purpose of this paper is to show the efficiency of RFRM (Release-time based Fault-tolerant Real-time Multicast) protocol which is based on the idea of attaching the official release time to each multicast message. As a part of this, a real-time simulation based on the TMO structuring scheme is conducted to evaluate the proposed approach. We experiment a real-time multicast model which does not receive ack-messages toward reducing the message traffic on the network by employing fault detection mechanism. simulation results promised the efficiency of the proposed real-time multicast protocol.

关键词： real time multicast protocol fault tolerance acknowledgement official release time simulation TMO distributed parallel object

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Experiment scheduling in faster-than-real-time simulation 16

Experiment scheduling in faster-than-real-time simulation

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16th workshop on parallel and distributed simulation

作者： Anagnostopoulos, D Univ Athens Dept Informat Athens 15771 Greece

ISBN: (纸本)0769516084

Faster-than-real-time simulation (FRTS) can be used for the performance evaluation of systems behavior in real time, providing significant capabilities for studying systems with a time-varying behavior. FRTS enables model validation through comparing simulation results with the corresponding system observations. However, experimentation proves to be rather demanding, as both delivering output results and ensuring their reliability must be accomplished within a predetermined time frame. Output analysis of system observations and model results and relevant timing issues are discussed. A method is introduced that determines whether it is possible to execute the "optimal" faster-than-real-time experiment, in which case multiple replications are scheduled for execution, or a compromise has to be made between the ability to predict for the long future and the degree of reliability achieved for predictions. FRTS experimental results are also presented to support the effectiveness of the proposed method.

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Critical causality in istributed virtual environments 16

Critical causality in istributed virtual environments

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16th workshop on parallel and distributed simulation, PADS 2002

作者： Zhou, Suiping Cai, Wentong Turner, S.J. Lee, F.B.S. School of Computer Engineering Nanyang Technological University Singapore Singapore

ISBN: (纸本)0769516084

We investigate the causality issue in distributed virtual environments. Causality has been widely studied in parallel and distributed systems. However, most of the work in causality detection and preservation are from a logical time system point of view, which are not generally suitable for distributed virtual environments due to the high cost of the proposed schemes to preserve causality. In this paper, first, critical causal order is defined, which is a relaxation of the "happened before"-based causal relation. Then, causal receive order delivery is proposed with the advantage that both the real-time property of distributed virtual environments and the critical causal order relationship among events are preserved. Finally, an algorithm to achieve causal receive order delivery is given. Our algorithm is easy to implement, and it results in little extra traffic on the network. © 2002 IEEE.

关键词： causality distributed simulation virtual environments

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XSim:: Real-time analytic parallel simulations 16

<i>XSim</i>:: Real-time analytic parallel simulations

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16th workshop on parallel and distributed simulation

作者： Carothers, CD Rensselaer Polytech Inst Dept Comp Sci Troy NY 12180 USA

ISBN: (纸本)0769516084

Of critical importance to any real-time system is the issue of predictability. We divide overall system predictability into two parts: algorithmic and systemic. Algorithmic predictability is concerned with ensuring that the parallel simulation engine and model from a complexity point of view are able to consistently yield results within a real-time deadline. Systemic predictability is concerned with ensuring that OS scheduling, interrupts and virtual memory overheads are consistent over a real-time period. To provide a framework for investigating systemic predictability, we define a new class of parallel simulation called Extreme simulation or XSim. An XSim is any analytic parallel simulation that is able to generate a statistically valid result by a real-time deadline. Typically, this deadline is between 10 and 100 milliseconds. XSims are expected to provide decision support to existing complex, realtime systems. As a new design and implementation methodology for realizing XSims, we embed a state-of-the-art optimistic simulator into the Linux operating system. In this operating environment, OS scheduling and interrupts are disabled. Given a 50 millisecond model completion deadline, we observe that the XSim has a systemic predictability, measure of 98% compared with only 56% for the same Time Warp system operating in user-level.

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