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μsik -: A micro-kernel for parallel/distributed simulation systems 05

μsik -: A micro-kernel for parallel/distributed simulation ...

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

作者： Perumalla, KS Georgia Inst Technol Coll Comp Atlanta GA 30332 USA

ISBN: (纸本)0769523838

A novel micro-kernel approach to building parallel/distributed simulation systems is presented. Using this approach, a unified system architecture is developed for incorporating, multiple types of simulation processes. The processes hold potential to employ a variety of synchronization mechanisms, and could even alter their choice of mechanism dynamically. Supported mechanisms include traditional lookahead-based conservative and state saving-based optimistic execution approaches. Also supported are newer mechanisms such as reverse computation-based optimistic execution and aggregation-based event processing, all within a single parsimonious application programming interface. The internal implementation and a preliminary performance evaluation of this interface are presented in mu sik, which is an efficient parallel/distributed realization of the microkernel architecture in C++.

关键词： parallel processing systems

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parallel event-driven neural network simulations using the Hodgkin-Huxley neuron model 05

Parallel event-driven neural network simulations using the H...

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

作者： Lobb, CJ Chao, Z Fujimoto, RM Potter, SM Georgia Inst Technol Coll Comp Atlanta GA 30332 USA

ISBN: (纸本)0769523838

Neural systems are composed of a large number of highly-connected neurons and are widely simulated within the neurological community. In this paper, we examine the application of parallel discrete event simulation techniques to networks of a complex model called the Hodgkin-Huxley neuron[1]. We describe the conversion of this model into an event-driven simulation, a technique that offers the potential of much greater performance in parallel and distributed simulations compared to time-stepped techniques. We report results of an initial set of experiments conducted to determine the feasibility of this parallel event-driven Hodgkin-Huxley model and analyze its viability for large-scale neural simulations.

关键词： Neural networks Discrete event simulation Neurons Computational modeling Nervous system Computer networks Concurrent computing distributed computing Biological system modeling Cells (biology)

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Towards time-parallel road traffic simulation 05

Towards time-parallel road traffic simulation

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

作者： Kiesling, T Lüthi, J Univ Bundeswehr Munchen Fak Informat D-85577 Neubiberg Germany

ISBN: (纸本)0769523838

As an alternative to spatial parallelization of simulation models, time-parallel simulation offers the potential for massive parallelism with a high level of independence between the parallel processes. Unfortunately, due to inherent problems, the applicability of time-parallel simulation is restricted. Therefore, it has been proposed recently, to use approximation with time-parallel simulation in order to facilitate its application and to extend the class of models suitable for time-parallel simulation. As a proof-of-concept, this work shows how approximate temporal parallelization can be applied to the simulation of road traffic. Traffic simulation is used extensively in transportation research for various purposes, e.g. analysis of traffic phenomena, traffic forecast, and optimization of traffic flow. Depending on the level of fidelity, a traffic model exhibits a state space of moderate to high complexity. This paper is intended to discuss the basic properties of time-parallel traffic simulation and to examine its feasibility. Experiments with a sequential microscopic traffic simulator that emulates important aspects of a corresponding time-parallel simulator suggest this feasibility.

关键词： Traffic control Computational modeling Roads Transportation Vehicles Microscopy Large-scale systems parallel processing Analytical models Predictive models

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Sequential performance of asynchronous conservative PDES algorithms 05

Sequential performance of asynchronous conservative PDES alg...

引用

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

作者： Curry, R Kiddle, C Simmonds, R Unger, B Univ Calgary Dept Comp Sci Calgary AB T2N 1N4 Canada

ISBN: (纸本)0769523838

The widespread use of sequential simulation in large scale parameter studies means that large cost savings can be made by improving the performance of these simulators. Sequential discrete event simulation systems usually employ a central event list to manage future events. This is a priority queue ordered by event timestamps. Many different priority queue algorithms have been developed with the aim of improving simulator performance. Researchers developing asynchronous conservative parallel discrete event simulations have reported exceptional performance for their systems running sequentially in certain cases. This paper compares the performance of simulations using a selection of high performance central event list implementations to that achieved using techniques borrowed from the parallel simulation community. Theoretical and empirical analysis of the algorithms is presented demonstrating the range of performance that can be achieved, and the benefits of employing parallel simulation techniques in a sequential execution environment.

关键词： sequential discrete event simulation parallel discrete event simulation conservative synchronization

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proceedings - workshop on Principles of Advanced and distributed simulation, PADS 2005

Proceedings - Workshop on Principles of Advanced and Distrib...

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workshop on Principles of Advanced and distributed simulation, PADS 2005

The proceedings contain 30 papers from the workshop on Principles of Advanced and distributed simulation, PADS 2005. The topics discussed include: modeling and simulating the brain as a system;towards time-parallel road traffic simulation;parallel event-driven neural network simulations using the Hodgkin-Huxley Neuron model;optimistic protocol analysis in a performance analyzer and prediction tool;distributed worm simulation with a realistic internet model;mobile contagion: simulation of infection and defense;efficient simulation of Wireless Networks Using Lazy MAC state update;the WarpIV simulation kernel;preliminary simulation of the effect of scanning worm activity on multicast;and merging parallel simulation programs.

关键词： distributed computer systems

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Performance prediction using simulation of large-scale interconnection networks in POSE 05

Performance prediction using simulation of large-scale inter...

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

作者： Wilmarth, TL Zheng, GB Bohm, EJ Mehta, Y Choudhury, N Jagadishprasad, P Kalé, LV Univ Illinois Dept Comp Sci Urbana IL 61801 USA

ISBN: (纸本)0769523838

parallel discrete event simulation (PDES) of models with fine-grained computation remains a challenging problem. We explore the usage of POSE, our parallel Object-oriented simulation Environment, for application performance prediction on large parallel machines such as BlueGene. This study involves the simulation of communication at the packet level through a detailed network model. This presents an extremely fine-grained simulation: events correspond to the transmission and receipt of packets. Computation is minimal, communication dominates, and strong dependencies between events result in a low degree of parallelism. There is limited look-ahead capability since the outcome of many events is determined by the application whose performance the simulation is predicting. Thus conservative synchronization approaches are challenging for this type of problem. We present recent experiences and performance results for our network simulator and illustrate the utility of our simulator through prediction and validation studies for a molecular dynamics application.(1)

关键词： Predictive models Large-scale systems Multiprocessor interconnection networks Intelligent networks Object oriented modeling Computational modeling Discrete event simulation Concurrent computing Application software parallel machines

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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

引用

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 ...

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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...

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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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