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An interdisciplinary approach to scientific modeling and simulation

An interdisciplinary approach to scientific modeling and sim...

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6th International Conference on Software Engineering, Artificial Intelligence, Networking and parallel/distributed Computing/1st ACIS International workshop on Self-Assembling Wireless Networks

作者： O'Leary, M Azadegan, S Towson State Univ Dept Math Towson MD USA

We describe a model for an interdisciplinary course in scientific modeling and simulation. We discuss the course structure and content, as well as the results of our evaluation process.

ISBN: (纸本)0769522947

We describe a model for an interdisciplinary course in scientific modeling and simulation. We discuss the course structure and content, as well as the results of our evaluation process.

关键词： education simulation software engineering

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Merging parallel simulation programs 05

Merging parallel simulation programs

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19th workshop on Principles of Advanced and distributed simulation (PADS 2005)

作者： Agarwal, A Hybinette, M Univ Georgia Dept Comp Sci Athens GA 30602 USA

ISBN: (纸本)0769523838

In earlier work cloning is proposed as a means for efficiently splitting a running simulation midway through its execution into multiple parallel simulations. In simulation cloning, clones usually are able to share computations that occur early in the simulation, but as their states diverge individual LPs are replicated as necessary so that their computations proceed independently. However if overtime the state of the clones (or their constituent LPs) converges there is, as of yet, no means for recombining them. In this case some efficiency is lost because they will execute identical events. This idea is the reverse of cloning, as we merge logical processes that have been previously cloned and we show that this can further increase efficiency because the new uncloned LPs will complete computations that would otherwise be duplicated. We discuss our implementation of merging, and illustrate its effectiveness in several example simulation scenarios.

关键词： Merging Computational modeling Cloning Computer simulation Context modeling Computer science Telecommunication traffic Traffic control Conferences Software systems

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Performance benchmark of a parallel and distributed network simulator 05

Performance benchmark of a parallel and distributed network ...

引用

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

作者： Lee, S Leaney, J O'Neill, T Hunter, M Univ Technol Sydney Inst Informat & Commun Technol Broadway NSW 2007 Australia

ISBN: (纸本)0769523838

simulation of large-scale networks requires enormous amounts of memory and processing time. One way of speeding up these simulations is to distribute the model over a number of connected workstations. However, this introduces inefficiencies caused by the need for synchronization and message passing between machines. In distributed network simulation, one of the factors affecting message passing overhead is the amount of cross-traffic between machines. We perform an independent benchmark of the parallel/distributed Network Simulator (PDNS) based on experimental results processed at the Australian Centre for Advanced Computing and Communications (AC3) supercomputing cluster. We measure the effect of cross-traffic on wall-clock time needed to complete a simulation for a set of basic network topologies by comparing the result with the wall-clock time needed on a single processor. Our results show that although efficiency is reduced with large amounts of cross-traffic, speedup can still be achieved with PDNS. With these results, we developed a performance model that can be used as a guideline for designing future simulations.

关键词： Computational modeling Message passing Large-scale systems Workstations Australia Computer networks Concurrent computing distributed computing Time measurement Network topology

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Scalable and efficient parallel and distributed simulation of complex, dynamic and mobile systems

Scalable and efficient parallel and distributed simulation o...

引用

workshop on Techniques, Methodologies and Tools for Performance Evaluation of Complex Systems

作者： Bononi, L Bracuto, M D'Angelo, G Donatiello, L Univ Bologna Dipartimento Sci Informaz I-40126 Bologna Italy

ISBN: (纸本)0769524478

In this work we illustrate the design and implementation guidelines of a recently developed middleware defined to support the parallel and distributed simulation of large scale, complex and dynamically interacting system models. The distributed simulation of complex system models, may suffer the communication and synchronization required to maintain the causality constraints between distributed model components. We designed and implemented the ARTIS middleware as a new framework by incorporating a set of features that allow adaptive optimization by exploiting many complex and dynamic model and distributed simulation characteristics. As an example, a dynamic migration mechanism for the run-time adaptive allocation of model entities has been designed and exploited for dynamic load and communication balancing. Optimizations have been introduced to obtain the maximum advantage from heterogeneous and asymmetric communication systems, from shared memory to LAN and Internet communication. Other optimizations have been introduced by the exploitation of concurrent replications of parallel and distributed simulations, in order to increase the resources utilization and to maximize the speedup of simulation processes. Solutions have been designed, implemented and tuned to obtain a significant reduction in the communication and synchronization overheads between the physical execution units, and an increased model scalability and simulation speedup, even in worst-case modeling assumptions and simulation scenarios.

关键词： Scalability Resource utilization simulating Communication Research parallel Lines Distribute Speeding adaptive optimization shared memory Local Area Networks dynamic loading COMMUNICATION SYSTEMS Middleware

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Seven-O'Clock: A new distributed GVT algorithm using network atomic operations 05

Seven-O'Clock: A new distributed GVT algorithm using network...

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19th workshop on Principles of Advanced and distributed simulation (PADS 2005)

作者： Bauer, D Yaun, G Carothers, CD Yuksel, M Kalyanaraman, S Rensselaer Polytech Inst Dept Comp Sci Troy NY 12180 USA

ISBN: (纸本)0769523838

In this paper we introduce a new concept, network atomic operations (NAOs) to create a zero-cost consistent cut. Using NAOs, we define a wall-clock-time driven GVT algorithm called Seven O' Clock that is an extension of Fujimoto's shared memory GVT algorithm. Using this new GVT algorithm, we report good optimistic parallel performance on a cluster of state-of-the-art Itanium-II quad processor systems for both benchmark applications such as PHOLD and real-world applications such as a large-scale TCP/Internet model. In some cases, super-linear speedup is observed.

关键词： Processor scheduling Clustering algorithms Memory management Discrete event simulation Computer science Large-scale systems Internet Heart Scheduling algorithm Concurrent computing

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XTW, a parallel and distributed logic simulator

XTW, a parallel and distributed logic simulator

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19th workshop on Principles of Advanced and distributed simulation (PADS 2005)

作者： Xu, Q Tropper, C McGill Univ Sch Comp Sci Montreal PQ H3A 2A7 Canada

ISBN: (纸本)0769523838

In this paper, a new event scheduling mechanism XEQ and a new rollback procedure rb-messages are proposed for use in optimistic logic simulation. We incorporate both of these techniques in a simulator XTW. XTW groups LPs into clusters, and makes use of a multi-level queue,XEQ, to schedule events in the cluster. XEQ has an O(1) event scheduling time complexity. Our new rollback mechanism replaces the use of anti-messages by an rb-message, and eliminates the need for an output queue at each LP. Experimental comparisons to Time Warp reveal a superior performance on the part of XTW, while experimental results over large circuits (5-million-gate to 25-million-gate) shows XTW scales well with both the size of circuits and the number of processors.

关键词： Computer simulation

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Optimistic parallel discrete event simulations of physical systems using reverse computation

Optimistic parallel discrete event simulations of physical s...

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workshop on Principles of Advanced and distributed simulation, PADS 2005

作者： Tang, Yarong Perumalla, Kalyan S. Fujimoto, Richard M. Karimabadi, Homa Driscoll, Jonathan Omelchenko, Yuri College of Computing Georgia Institute of Technology Atlanta GA 30332-0280 SciberNet Inc. Solana Beach CA 92075

Efficient computer simulation of complex physical phenomena has long been challenging due to their multi-physics and multi-scale nature. In contrast to traditional time-stepped execution methods, we describe an approach using optimistic parallel discrete event simulation (PDES) and reverse computation techniques. We show that reverse computation-based optimistic parallel execution can significantly reduce the execution time of a plasma simulation without requiring a significant amount of additional memory compared to conservative execution techniques. We describe an application-level reverse computation technique that is efficient and suitable for complex scientific simulations involving floating point operations. © 2005 IEEE.

关键词： parallel processing systems

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Optimistic protocol analysis in a performance analyser and prediction tool

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

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

Evolutionary performance-oriented development of parallel pr...

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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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