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

共 1171 条记录，以下是211-220 订阅

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Optimistic protocol analysis in a performance analyser and prediction tool

Optimistic protocol analysis in a performance analyser and p...

引用

workshop on Principles of Advanced and distributed simulation, PADS 2005

作者： Teo, Peihan Turner, Stephen John Juhasz, Zoltan School of Computer Engineering Nanyang Technological University Singapore Singapore Department of Information Systems University of Veszprem Hungary Department of Computer Science University of Exeter United Kingdom

parallelising sequential discrete event simulation programs is often a tedious process, with no guarantee for speedup. This paper describes a performance analyser tool developed to predict the execution performance of parallel discrete event simulation programs, using either optimistic or conservative protocols. The tool aims to provide the user with the flexibility of choosing the simulation protocol desired, and to make useful comparisons between the results obtained. The novel feature of the analyser is that it predicts the parallel execution performance based on a sequential simulation run, without the parallel implementation developed. This paper describes the structure and operation of the analyser program focusing on the analysis of the optimistic simulation protocol. As the prediction of the optimistic protocol is very different from the conservative one, its uniqueness will be illustrated in this paper. The performance analyzer and prediction tool can be used to explore different protocols and parameters in order to provide faster decision making about the final implementation strategy. © 2005 IEEE.

关键词： parallel processing systems

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The WarpIV simulation Kernel 05

The WarpIV Simulation Kernel

引用

workshop on Principles of Advanced and distributed simulation, PADS 2005

作者： Steinman, Jeffrey S. RAM Laboratories Inc. 10525 Vista Sorrento Parkway San Diego CA 92121

ISBN: (纸本)9780769523835

This paper provides an overview of the WarpIV simulation Kernel that was designed to be an initial implementation of the Standard simulation Architecture (SSA). WarpIV is the next generation replacement for the Synchronous parallel Environment for Emulation and Discrete Event simulation (SPEEDES) framework that has supported a number of DoD simulation programs including MDWAR, EADTB, JSIMS, and others. This paper first provides a look back at the historical evolution of SPEEDES, the evolution of the SSA, and the development of WarpIV. This historical background is followed by a description of the layered SSA and design of WarpIV. Capabilities and new algorithms or data structures provided by each layer of the architecture are mentioned, but are not described in full detail. Several benchmarks for the underlying communications infrastructure and internal event-processing engine are given. The summary and conclusions section highlights the main technical points of the paper and describes future research and development goals for WarpIV. © 2005 IEEE.

关键词： Computer architecture

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Dynamic trust metrics for peer-to-peer systems

Dynamic trust metrics for peer-to-peer systems

引用

16th International workshop on Database and Expert Systems Applications

作者： Duma, C Shahmehri, N Caronni, G Linkoping Univ Dept Informat & Comp Sci Linkoping Sweden

ISBN: (纸本)0769524249

One of the fundamental challenges for Peer-to-Peer (P2P) systems is the ability to manage risks involved in interacting and collaborating with priorly unknown and potentially malicious parties. Reputation-based trust management can mitigate this risk by deriving the trustworthiness of a certain peer from that peer's behavior history. However the existing reputation systems do not provide adequate reaction to quick changes in peers' behavior raising serious concerns regarding their effectiveness in coping with dynamic malicious peers. In this paper we investigate the requirements on the dynamics of trust in P2P systems and propose a versatile trust metric which satisfies these requirements. In particular, our proposed metric is capable to detect and penalize both the sudden changes in peers' behavior and their potential oscillatory malicious behavior Moreover, our metric is flexible to implement different types of trust dynamics. We evaluate our metric through simulation and show its unique features and advantages over the existing metrics.

关键词： distributed computer systems

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Evolutionary performance-oriented development of parallel programs by composition of components

Evolutionary performance-oriented development of parallel pr...

引用

5th International workshop on Software and Performance, WOSP'05

作者： Mahmood, Nasim Feng, Yusheng Browne, James C. Department of Computer Sciences University of Texas at Austin Austin TX 78712 United States Institute for Computational Engineering and Sciences University of Texas at Austin Austin TX 78712 United States

ISBN: (纸本)1595930876

This paper describes a method for evolutionary component-based development of families of parallel programs to attain performance goals on multiple execution environments for multiple family instances and an implementation of the method. It is based upon combining component-oriented development with integration of parallel/distributed execution and parallel/distributed simulation. Each component may have multiple representations at multiple levels of realization from analytical timing models to production code. Each component is encapsulated with an associative interface specifying its properties and behaviors which enables distinguishing among different implementations (or abstractions) of the same functional behavior which may have different performance behavior. Evolutionary development evolves a program from an abstract performance model to a complete program and may continue evolution during runtime. Performance can be estimated at any stage of realization. The implementation is a compiler which composes parallel/distributed programs from components encapsulated with associative interfaces and a runtime system which supports integrated execution/simulation of parallel programs composed from components at different levels of abstraction and program evolution at runtime by component replacement. Case studies in the application of the evolutionary development method including performance results are given. Copyright 2005 ACM.

关键词： Computer programming

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Efficient simulation of wireless networks using LAzy MAC state uPdate

Efficient simulation of wireless networks using LAzy MAC sta...

引用

workshop on Principles of Advanced and distributed simulation, PADS 2005

作者： Lee, Young J. Riley, George F. School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA 30332

Scalable and efficient network simulation methods are the method of choice for evaluating and verifying wireless network protocols on a moderate to large scale. This need becomes obvious when simulating very large-scale wireless networks such as emerging ad hoc sensor networks in which the number of nodes can be the order of thousands or more, and with very high node density. Unfortunately, simulation of such large-scale wireless networks often requires excessively large amounts of computing resources and can be slow to complete. One approach to achieving higher performance in a large-scale network simulation is the use of parallel or distributed simulation techniques. However, the efficient distributed simulation of wireless ad hoc networks is still a daunting task. Therefore, we turn our attention to more traditional sequential simulation methods, and seek to reduce the overhead incurred in the Medium Access Control (MAC) state update propagation between wireless nodes. We introduce a novel method called LAMP (LAzy MAC state uPdate), that substantially reduces this overhead, with no loss of accuracy. Using our wireless network simulation tool, we compare the efficiency of the LAMP approach to the more traditional approach, and show a performance improvement of up to a factor of eight, with no loss of accuracy. © 2005 IEEE.

关键词： Wireless telecommunication systems

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An efficient distributed broadcasting algorithm for ad hoc networks

引用

6th International workshop on Advanced parallel Processing Technologies

作者： Sun, Q Li, LY Wuhan Univ Technol Sch Comp Sci Wuhan 430063 Hubei Peoples R China

ISBN: (纸本)3540296395

In this paper, an efficient distributed heuristic-based algorithm is presented, which is based on joint distance-counter threshold scheme. It features a distributed manner by each node in the network needing no global information. Each node in an ad hoc network receives the message from its neighbors and decides whether to operate retransmitting or not according to the signal strength and times of the receiving messages. The algorithm has superiority such as reliability, rebroadcast saving, less communication overhead for broadcasting task, localized and parameter-less behaviors, so it is easy to operate and possesses a good performance in mobile ad hoc communication environments. A comparison with several other existing algorithms is conducted. It shows by simulation results that the new algorithm is more efficient than others.

关键词： Network protocols

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proceedings 2005 workshop on Techniques, Methodologies and Tools for Performance Evaluation of Complex Systems: FIRB-Perf 2005

Proceedings 2005 Workshop on Techniques, Methodologies and T...

引用

2005 workshop on Techniques, Methodologies and Tools for Performance Evaluation of Complex Systems, FIRB-Perf 2005

ISBN: (纸本)0769524478

The proceedings contain 14 papers. The topics discussed include: performance issues in video streaming environments;design and testing of scalable web-based systems with performance constraints;models of dynamic web content;performance modeling of P2P file sharing applications;performance model building of pervasive computing;design and performance evaluation of mechanisms for mobile-devices handoff forecast;efficient analysis algorithms for parametric fault trees;a tool set for modeling and simulation of robotic workcells;software performance analysis in UML models;scalable and efficient parallel and distributed simulation of complex, dynamic and mobile systems;and towards transparent optimistic synchronization in HLA.

关键词： Large scale systems

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Efficient simulation of wireless networks using lazy MAC state update 05

Efficient simulation of wireless networks using lazy MAC sta...

引用

workshop on Principles of Advanced and distributed simulation (PADS 2005)

作者： Lee, YJ Riley, GF Georgia Inst Technol Sch Elect & Comp Engn Atlanta GA 30332 USA

ISBN: (纸本)0769523838

Scalable and efficient network simulation methods are the method of choice for evaluating and verifying wireless network protocols on a moderate to large scale. This need becomes obvious when simulating very large-scale wireless networks such as emerging ad hoc sensor networks in which the number of nodes can be the order of thousands or more, and with very high node density. Unfortunately, simulation of such large-scale wireless networks often requires excessively large amounts of computing resources and can be slow to complete. One approach to achieving higher performance in a large-scale network simulation is the use of parallel or distributed simulation techniques. However the efficient distributed simulation of wireless ad hoc networks is still a daunting task. Therefore, we turn our attention to more traditional sequential simulation methods, and seek to reduce the overhead incurred in the Medium Access Control (MAC) state update propagation between wireless nodes. We introduce a novel method called LAMP (LAzy MAC state uPdate), that substantially reduces this overhead, with no loss of accuracy. Using our wireless network simulation tool, we compare the efficiency of the LAMP approach to the more traditional approach, and show a performance improvement of up to a factor of eight, with no loss of accuracy.

关键词： Wireless networks Computational modeling Large-scale systems Wireless sensor networks Lamps Wireless application protocol Computer networks Mobile ad hoc networks Media Access Protocol Performance loss

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Design and implementation of semantic caching coherency control scheme toward distributed environment

引用

6th International workshop on Advanced parallel Processing Technologies

作者： Wan, H Li, L Sun Yat Sen Univ Dept Comp Sci & Technol Guangzhou 510275 Peoples R China Sun Yat Sen Univ Software Res Inst Guangzhou 510275 Peoples R China

ISBN: (纸本)3540296395

Semantic caching is very attractive for use in distributed computing environments based on historical queries and their descriptions, one of whose important issues is how to best maintain semantic caching using a coherency control scheme. With the object of applying semantic caching into practice, the cache coherency problems including the data between the server and its caching as well as the cached data and their semantic descriptions are analyzed. This paper presents conflicts existing in semantic caching and their formal definitions, proposes the semantic caching model, and coherency control scheme, meanwhile derives update list optimization algorithm adopted in server and coherency control algorithm used in clients. Finally, the performance of the semantic caching coherency control scheme is examined and analyzed through a simulation study in detail.

关键词： Semantics

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A distributed scheme for autonomous service composition 1

A distributed scheme for autonomous service composition

引用

1st ACM International workshop on Multimedia Service Composition, MSC 2005

作者： Herborn, Stephen Lopez, Yoann Seneviratne, Aruna University of New South Wales Australia National ICT Australia Australia

ISBN: (纸本)1595932453

Some multimedia content may be divisible into independently routable components, e.g. audio and video flows. As a result media content adaptation services may be linked in serial, parallel and hybrid configurations to form a directed, acyclic graph of composed services. We specify a distributed service path selection scheme for the construction of composed directed service graphs, which integrates a peer-to-peer routing algorithm, a service discovery mechanism, and abstract scheme for content description. Our approach enables the autonomous selection of converging and non-converging service graphs, which enable media content to be separated into sub-components and delivered to separate devices, applications or network interfaces. Our content, client and service description scheme focuses on addressing mobility, multi-device, and multi-homing requirements. We include results of simulation designed to study the performance of several service discovery options, and present initial conclusions based on our findings. © 2005 ACM.

关键词： Quality of service

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