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

共 1361 条记录，以下是61-70 订阅

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Lock-free scheduling of logical processes in parallel simulation

Lock-free scheduling of logical processes in parallel simula...

引用

15th workshop on parallel and distributed simulation (PADS 2001)

作者： Liu, J Nicol, DM Tan, K Dartmouth Coll Dept Comp Sci Hanover NH 03755 USA

ISBN: (纸本)076951104X;0769511058

With fixed lookahead information in a simulation model, the overhead of asynchronous conservative parallel simulation lies in the mechanism used for propagating time updates in order for logical processes to safety advance their local simulation clocks. Studies have shown that a good scheduling algorithm should preferentially schedule processes containing events on the critical path. This paper introduces a lock-free algorithm for scheduling logical processes in conservative parallel discrete-event simulation on shared-memory multiprocessor machines. The algorithm uses fetch&add operations that help avoid inefficiencies associated with using locks. The lock-free algorithm is robust. Experiments show that, compared with the scheduling algorithm using locks, the lock-free algorithm exhibits better performance when the number of logical processes assigned to each processor is small or when the workload becomes significant. In models with large number of logical processes, our algorithm shows only modest increase in execution time due to the overhead in the algorithm for extra bookkeeping.

关键词： parallel processing systems

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Implementation of a TMO-based real-time airplane landing simulator on a distributed computing environment 7

Implementation of a TMO-based real-time airplane landing sim...

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

作者： Lee, MG Lee, SG POSTECH EE Dept Pohang 790784 South Korea

ISBN: (纸本)0769515762

In real-time simulation, the system being simulated should display the same timing behavior as the target system. The simulation accuracy is increased as the simulation time unit is decreased. Although there are several models for such a system, the TMO model is particularly appropriate due to its natural support for real-time distributed object oriented programming. This paper discusses the results of the implementation of a real-time airplane-landing simulator on a distributed computing environment using the TMO model.

关键词： Airplanes Analytical models Chemical processes Computational modeling Computer simulation distributed computing Object oriented modeling Object oriented programming Real time systems Timing

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Safe timestamps and large-scale modeling

Safe timestamps and large-scale modeling

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14th workshop on parallel and distributed simulation (PADS 2000)

作者： Nicol, D Liu, J Cowie, J Dartmouth Coll Hanover NH 03755 USA

ISBN: (纸本)0769506771

This paper visits issues that recur in consideration of simulation time-stamps, in the context of building very large simulation models from components developed by different groups, at different times. A key problem here is "safety", loosely defined to mean that unintended model behavior does not occur due to unpredictable behavior of timestamp generation and comparisons. We revisit the problems of timestamp format and simultaneity, and then turn to the new problem of timestamp inter-operability. We describe how a C++ simulation kernel can support the concurrent evaluation of submodels that internally use heterogeneous timestamps, and evaluate the execution time costs of doing so. We find that use of a safe timestamp format that explicitly allows different timescales costs less than 10 over a stock 64-bit integer format, whereas support for completely heterogeneous timestamps can cost as much as 50% in execution speed.

关键词： Computer simulation

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Tolerant synchronization for distributed simulations of interconnected computer networks

Tolerant synchronization for distributed simulations of inte...

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11th workshop on parallel and distributed simulation

作者： Martini, P Rumekasten, M Tolle, J Univ of Bonn Bonn Germany

ISBN: (纸本)0818679654

This paper presents the tolerant, hybrid synchronization schema and its benefits for the parallel and distributed simulation of interconnected computer networks. The hybrid schema combines conservative and optimistic synchronization approaches by using lookahead for scheduling special events and using the flexibility of Time Warp in certain cases. In addition to these classical approaches the introduction of the ''tolerance'' allows the distributed modules to simulate further ahead than guaranteed by the conservative synchronization schema. This results in significantly smaller simulation runtimes and many other benefits.

关键词： Interconnection networks

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Optimizing cell-size in grid-based DDM

Optimizing cell-size in grid-based DDM

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14th workshop on parallel and distributed simulation (PADS 2000)

作者： Ayani, R Moradi, F Tan, G Natl Univ Singapore Sch Comp Singapore 119260 Singapore

ISBN: (纸本)0769506771

In a large-scale distributed simulation with thousands of dynamic objects, efficient communication of data among these objects is an important issue. The broadcasting mechanism specified by the distributed Interactive simulation (DIS) standards is not suitable for large scale described simulation. In the High Level Architecture (HLA) paradigm, the Runtime Infrastructure (RTI) provides a set of services, sich as data distribution management (DDM) among federates. The goal of the DDM module in RTI is to make the data communication more efficient by sending the data only to those federates that need the data, as opposed to the broadcasting mechanism employed by DIS. Several DDM schemes have appeared in the literature. In this paper we discuss grid-based DDM and develop a DDM model that uses grids for matching the publishing/subscription regions, and for data filtering. We show that appropriate choice of the grid-cell size is crucial in obtaining good performance. We develop an analytical model and derive a formula for identifying the optimal cell size in grid-based DDM.

关键词： distributed simulation HLA data communication group communication and data filtering

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A scaled version of the elastic time algorithm

A scaled version of the elastic time algorithm

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15th workshop on parallel and distributed simulation (PADS 2001)

作者： Quaglia, F Univ Roma La Sapienza Dipartimento Informat & Sistemist I-00198 Rome Italy

ISBN: (纸本)076951104X;0769511058

Recently a new class of synchronization algorithms for parallel discrete event simulation has been proposed, namely the near perfect state information algorithms, which are based on a notion of error potential to control the optimism of event execution. An algorithms of this class, called elastic time algorithm (ETA), has been instantiated. In this algorithm, the error potentials computed using temporal information (next event timestamp, simulation clocks etc.) and is then translated into event execution delay based on a constant factor. In this paper we present a scaled version of ETA (SEAT), in which the error potential is translated into event execution delay based on both a constant factor and an additional scaling factor determined dynamically as a function of the event granularity. We have implemented versions of ETA and SETA for a cluster of PCs connected by a Myrinet switch and we have established in an empirical study that SETA outperforms ETA if there is difference in the granularity of different event types.

关键词： parallel processing systems

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Statistical methodology for WEB-based simulation 7

Statistical methodology for WEB-based simulation

引用

7th International Symposium on distributed simulation and Real-Time Applications

作者： Biles, WE Kleijnen, JPC Univ Louisville Dept Ind Engn Louisville KY 40292 USA

ISBN: (纸本)0769520367

This paper describes a procedure for assigning simulation trials to a set of parallel processors for the purpose of conducting a simulation study, involving a complex simulation model, in near real time. Unlike distributed simulation, where a complex simulation model is decomposed and its parts run in a parallel environment, the parallel replications approach discussed here involves running simulation replications to completion for the entire model. The unique element here is that the workload involved in running the simulation study is too time consuming to execute on a single workstation, so that the simulation analyst must utilize computer resources available through the web. New statistical methodology is needed for running a complex simulation study in a web-based, parallel replications environment.

关键词： Analytical models Computational modeling Computer simulation Industrial engineering Information systems Lifting equipment Predictive models Real time systems Statistical analysis Workstations

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A framework for executing parallel simulation using RTI 7

A framework for executing parallel simulation using RTI

引用

7th International Symposium on distributed simulation and Real-Time Applications

作者： Yuan, ZJ Cai, WT Low, MYH Nanyang Technol Univ Sch Comp Engn Parallel & Distributed Comp Ctr Singapore 639798 Singapore

ISBN: (纸本)0769520367

The Grid enables large-scale resource sharing and makes it viable for running large-scale parallel and distributed simulations. The High Level Architecture (HLA) paradigm provides a software platform and interoperability interface for simulation components to utilize these hardware resources. However, neither the Grid nor the HLA provides mechanism for resource management for parallel and distributed simulations. It is also noticed that substantial effort is required for writing program that conforms to the Runtime Infrastructure (RTI) requirements because of its complexity. In this paper, we introduce a framework for designing and executing parallel simulation using the RTI. The framework is also designed to assist load balancing and checkpointing. With the code library from our framework, the modeler is able to complete the design of a parallel simulation that runs on RTI by specifying the simulation configuration and the handling detail of each event. Our framework incorporates automatic code generation. It also uses Data Distribution Management to route simulation events (interactions) to achieve efficient use of network bandwidth.

关键词： HLA DDM federate model parallel simulation code generation Java

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Component-based distributed simulations. The way forward?

Component-based distributed simulations. The way forward?

引用

18th workshop on parallel and distributed simulation

作者： Verbraeck, A Delft Univ Technol Fac Technol Policy & Management Syst Engn Sect NL-2600 GA Delft Netherlands

ISBN: (纸本)0769521118

parallel simulation and distributed simulation sometimes appear to be two different worlds. Where parallel simulation aims at increasing the speed of a single model by distributing it over more processors, distributed simulation looks at ways to link entire models or federates that run on different computers. In the case of distributed simulation, the models themselves are hard to distribute, and often they each run on one processor as a monolithic model. This paper advocates to build the more traditional simulation models in such a way, that they can be easily distributed. As simulationists, we can learn from component-based theory from the software engineering field to prepare our models for distribution, and parts of our models for reuse. The results of several projects show that componentizing simulation models can have many advantages. The results also show that it is not easy to create models in a componentized way, and that current methods for simulation model building should be adapted.

关键词： Program processors

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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...

引用

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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