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Analysing probabilistically constrained optimism 06

Analysing probabilistically constrained optimism

引用

10th IEEE International Symposium on distributed simulation and Real-Time Applications, DS-RT 2006

作者： Lees, Michael Logan, Brian Dan, Chen Oguara, Ton Theodoropoulos, Georgios School of Computer Science and IT University of Nottingham United Kingdom School of Computer Science University of Birmingham United Kingdom

ISBN: (纸本)0769526977

In previous work we presented the DTRD algorithm, an optimistic synchronisation algorithm for parallel discrete event simulation of multi-agent systems, and showed that it outperforms Time Warp and time windows on range of test cases. DTRD uses a decision theoretic model of rollback to derive an optimal time to delay read event so as to maximise the rate of LVT progression. The algorithm assumes that the inter-arrival times (both virtual and real) of events are normally distributed. In this paper we present a more detailed evaluation of the DTRD algorithm, and specifically how the performance of the algorithm is affected when the inter-arrival times do not follow the assumed distributions. Our analysis suggests that the performance of the algorithm is relatively insensitive to events whose inter-arrival times are not normally distributed. However as the variance of the input events increases its performance degrades to that of Time Warp. Our approach to evaluation is general, and we outline how the analysis may be applied to other decision theoretic algorithms. © 2006 IEEE.

关键词： parallel algorithms

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Multi-level modeling and simulation in systems biology promises and challenges 06

Multi-level modeling and simulation in systems biology promi...

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10th IEEE International Symposium on distributed simulation and Real-Time Applications

作者： Uhrmacher, Adelinde M. Univ Rostock Inst Comp Sci Rostock Germany

ISBN: (纸本)0769526977

Systems Biology is aimed at analyzing the behavior and interrelationships of biological systems and is characterized by combining experimentation, theory, and computation. Multi-level models describe systems at different levels of organization and abstraction. To apply them in systems biology implies typically that concentration changes as well as the discrete behavior of single entities and their interactions need to be taken into account in modeling and simulation. A variety of approaches have been developed offering specific perspectives on cellular systems in modeling and simulation. We will explore how far multi-level aspects are already supported and identify challenges yet to be met.

关键词： Biological systems

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Aurora: An approach to high throughput parallel simulation 06

Aurora: An approach to high throughput parallel simulation

引用

20th workshop on Principles of Advanced and distributed simulation, PADS 2006

作者： Park, Alfred Fujimoto, Richard M. Computational Science and Engineering Division College of Computing Georgia Institute of Technology Atlanta GA 30332-0280 United States

ISBN: (纸本)0769525873

A master/worker paradigm for executing large-scale parallel discrete event simulation programs over network-enabled computational resources is proposed and evaluated. In contrast to conventional approaches to parallel simulation, a client/server architecture is proposed where clients (workers) repeatedly download state vectors of logical processes and associated message data from a server (master), perform simulation computations locally at the client, and then return the results back to the server. This process offers several potential advantages over conventional parallel discrete event simulation systems, including support for execution over heterogeneous distributed computing platforms, load balancing, efficient execution on shared platforms, easy addition or removal of client machines during program execution, simpler fault tolerance, and improved portability. A prototype implementation called the Aurora parallel and distributed simulation System (Aurora) is described. The structure and interaction of the Aurora components is described. Results of an experimental performance evaluation are presented detailing primitive timings and application performance on both dedicated and shared computing platforms. © 2006 IEEE.

关键词： parallel processing systems

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distributed load balancing in heterogeneous peer-to-peer networks for web computing libraries 06

Distributed load balancing in heterogeneous peer-to-peer net...

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10th IEEE International Symposium on distributed simulation and Real-Time Applications

作者： Gehweiler, Joachim Schomaker, Gunnar Univ Gesamthsch Paderborn Heinz Nixdorf Inst Warburger Str 100 D-4790 Paderborn Germany

ISBN: (纸本)0769526977

In this work we present a novel architecture for distributed computing in a peer-to-peer network. In particular, we realize the Paderborn University BSP-based Web Computing Library (PUBWCL), which was formerly used as a centralized client-server architecture for scheduling and load balancing, as a pure peer-to-peer system. By using distributed heterogeneous hash tables (DHHT), our architecture-features scheduling and load balancing of tightly coupled, massively parallel algorithms in the bulk-synchronous (BSP) style with a minimal number of migrations. Furthermore, our architecture is capable of heterogeneous BSP programs whereas the former version of PUBWCL could only handle homogeneous BSP programs.

关键词： Peer to peer computing Load management Computer networks distributed computing Libraries Computer architecture Network servers Service oriented architecture Processor scheduling Web server

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Improving lookahead in parallel multiprocessor simulation using dynamic execution path prediction 06

Improving lookahead in parallel multiprocessor simulation us...

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20th workshop on Principles of Advanced and distributed simulation, PADS 2006

作者： Chung, Moo-Kyoung Kyung, Chong-Min Dynalith Systems Co. Ltd. CHiPS KAIST Daejeon Korea Republic of Department of EECS CHiPS KAIST Daejeon Korea Republic of

ISBN: (纸本)0769525873

simulation performance is dominated by lookahead in null message-based conservative time management of parallel discrete event simulation (PDES). This paper proposes a scheme for software execution path prediction to extend lookahead in parallel multiprocessor simulation. Templates for predicting program execution path are generated by software analysis, then, a processor model gets lookaheads by evaluating the templates at simulation time. We reduced the amount of null messages by a factor of 10 to 50 in parallel simulation with eight clustered workstations and, as a result, achieved a speedup factor of 4 to 7 compared to a conventional method having constant lookahead. © 2006 IEEE.

关键词： Program processors

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Limiting optimism: Time or event count? 06

Limiting optimism: Time or event count?

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10th IEEE International Symposium on distributed simulation and Real-Time Applications

作者： Abu-Ghazaleh, Nael B. Linderman, Richard SUNY Binghamton Dept Comp Sci Binghamton NY 13902 USA Rome Res Site Air Force Res Labs Rome NY Italy

ISBN: (纸本)0769526977

In optimistically synchronized parallel discrete event simulators, unlimited optimism can lead to excessive rollbacks and simulation thrashing. Artificially throttling the simulation is a well-known technique for improving the performance by avoiding the effects of uncontrolled optimism. simulation throttling has been attempted based on time or event Count beyond Global Virtual Time (GVT). In this paper, we carry Out a simulation study of both approaches within Time Warp as well as Breathing Time Warp (BTW) synchronization algorithms in the context of the SPEEDES simulation framework. We discover that anomalies arise when limiting optimism based on event count (as is the case in the default SPEEDES BTW algorithm) and that this gives rise to forced rollbacks that generally do not arise without simulation throttling. We implement a version of BTW that limits optimism based on time beyond GVT and show that it outperforms BTW for two large scale applications. We discuss initial experiences with adaptively estimating the optimism limit.

关键词： Discrete event simulation Computational modeling Time warp simulation Context modeling Application software Delay Computer science Large-scale systems Telecommunication computing Protocols

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Progressive time-parallel simulation 06

Progressive time-parallel simulation

引用

20th workshop on Principles of Advanced and distributed simulation, PADS 2006

作者： Kiesling, Tobias Fakultät für Informatik Universität der Bundeswehr München 85577 Neubiberg Germany

ISBN: (纸本)0769525873

parallel simulation techniques are designed to increase simulation model performance by exploiting model concurrency. Unfortunately, designing efficient parallel simulations is not always an easy task. Most existing techniques guarantee results identical to a corresponding sequential simulation. Other methods try to increase efficiency by relaxing causal constraints, leading to the calculation of approximate results. This work proposes to combine both approaches using the novel technique of progressive time-parallel simulation, where imprecise results are calculated rapidly and improved progressively later on until precise results are known. The user is allowed to cancel this process at any time if the accuracy is satisfying. Progressive time-parallel simulation is a specialized parallelization approach that is not applicable to every kind of simulation model. Possible application areas include simulation-based decision support or simulation-based scheduling and control of manufacturing systems. A successful application of the technique is illustrated with progressive queuing system simulation. © 2006 IEEE.

关键词： parallel processing systems

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Design of distributed collaborative application through service aggregation 06

Design of distributed collaborative application through serv...

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10th IEEE International Symposium on distributed simulation and Real-Time Applications, DS-RT 2006

作者： Roczniak, Andrew Melhem, Tamil Lévy, Pierre El Saddik, Abdulmotaleb Multimedia Communications Research Laboratory Collective Intelligence Laboratory University of Ottawa Ottawa Canada

ISBN: (纸本)0769526977

The Service Oriented Architecture (SOA) is used to support loosely-coupled integration of existing applications. We are investigating the possibility of creating entirely new applications based on SOA. We present a case study for a collaborative authoring application targeting groups of around five users collaborating over the Internet. We high-light the basic requirements of the application and show how these can be fulfilled by utilizing certain services accessed through standard HTTP, Jabber and JXTA set of protocols, and off-the-shelf techniques. By measuring the performance of the application in a heterogeneous environment and by providing details of an alternate service fulfilling the application's requirement, we show that SOA-based collaborative applications can be quickly designed and deployed. © 2006 IEEE.

关键词： Computer supported cooperative work

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Real time P2P network simulation for very large virtual environment 06

Real time P2P network simulation for very large virtual envi...

引用

10th IEEE International Symposium on distributed simulation and Real-Time Applications

作者： Romain, Cavagna Christian, Bouville Jerome, Royan France Telecom RD IRISA Rennes France

ISBN: (纸本)0769526977

The ever increasing speed of Internet connectious has led to a point where it is actually possible for every end user to seamlessly share data on Internet. Peer-To-Peer (P2P) network are typical of this evolution. The goal of our paper is to show that thanks to self-adaptive assignment ment techniques, server-less P2P networks can efficiently deal with very large environments such as met in the geo-visualisation area. our method takes advantage of a hierarchical and progressive data structure that describes the environment. In order to assess the global efficiency of this P2P technique, we have. implemented a dedicated real time simulator. Experimentation results are presented using a hierarchical LOD model of a very large urban environment.

关键词： Internet

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Proximity-aware synchronization within federation communities 06

Proximity-aware synchronization within federation communitie...

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10th IEEE International Symposium on distributed simulation and Real-Time Applications

作者： Okutanoglu, Aydin Bozyigit, Muslim Meteksan Sist AS METU Teknokent Silikon Blok Ankara Turkey Middle East Tech Univ Dept Comp Engn Ankara Turkey

ISBN: (纸本)0769526977

Federation communities in distributed simulation are attracting increasing interest in current works. distributed federation occurs especially when simulation space is partitioned into logically independent parts forming, rather autonomous clusters. However, federates in a cluster may become logically related to other federates in other clusters, in time. The main idea of this work is to view a federation community as a set of federate clusters. In this case the intra-cluster synchronization is separated from the inter-cluster synchronization. Synchronization between clusters will be necessary only when the different federate clusters become close to each other, depending on their relative proximity, When they are distant to each other they are assumed not to interact with each other, thus acting autonomously. Allowing such a temporal partitioning should reduce network traffic required for logical time management mechanism and also decrease the blocking time of individual federates.

关键词： Frequency synchronization Clustering algorithms Costs Switches distributed computing Partitioning algorithms Telecommunication traffic Traffic control Frequency conversion Bridges

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