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

共 1276 条记录，以下是601-610 订阅

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An approach for federating parallel simulators

An approach for federating parallel simulators

引用

workshop on Principles of Advanced and distributed simulation (PADS)

作者： S.L. Ferenci K.S. Perumalla R.M. Fujimoto Georgia Institute of Technology College of Computing Georgia Institute of Technology Atlanta GA USA

This paper investigates issues concerning federations of sequential and/or parallel simulators. An approach is proposed for creating federated simulations by defining a global conceptual model of the entire simulation, and then mapping individual entities of the conceptual model to implementations within individual federates. Proxy entities are defined as a means for linking entities that are mapped to different federates. Using this approach, an implementation of a federation of optimistic simulators is examined. Issues concerning the adaptation of optimistic simulators to a federated system are discussed. The performance of the federated system utilizing runtime infrastructure (RTI) software executing on a shared memory multiprocessor (SMP) is compared with a native (non-federated) SMP-based optimistic parallel simulator. It is demonstrated that a well designed federated simulation system can yield performance comparable to a native, parallel simulation engine, but important implementation issues must be properly addressed.

关键词： Discrete event simulation Computational modeling Engines Runtime Educational institutions Joining processes Aggregates Protocols Computer architecture Concurrent computing

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Pre-sampling as an approach for exploiting temporal uncertainty

Pre-sampling as an approach for exploiting temporal uncertai...

引用

workshop on Principles of Advanced and distributed simulation (PADS)

作者： M.L. Loper R.M. Fujimoto College of Computing Georgia Institute of Technology Atlanta GA USA

We describe an approach to exploit temporal uncertainty in parallel and distributed simulation by utilizing time intervals rather than precise time stamps. Unlike previously published work that proposes new message ordering semantics, our approach is based on conservative, time stamp order execution and enhancing the lookahead of the simulation by pre-drawing random numbers from a distribution that models temporal uncertainty. The advantages of this approach are that it allows time intervals to be exploited using a conventional Time Stamp Order (TSO) delivery mechanism, and it offers the modeler greater statistical control over the assigned time stamps. An implementation of this approach is described and initial performance measurements are presented.

关键词： Uncertainty Radio access networks Vehicles Educational institutions Identity-based encryption Computational modeling Read only memory Costs Discrete event simulation Humans

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Applying parallel discrete event simulation to network emulation

Applying parallel discrete event simulation to network emula...

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： R. Simmonds R. Bradford B. Unger University of Calgary Calgary Canada

The simulation of wide area computer networks is one area where the benefits of parallel simulation have been clearly demonstrated. We present a description of a system that uses a parallel discrete event simulator to act as a high speed network emulator. With this, real Internet Protocol (IP) traffic generated by application programs running on user workstations can interact with modelled traffic in the emulator thus providing a controlled test environment for distributed applications. The network emulator uses the TasKit conservative parallel discrete event simulation (PDES) kernel. TasKit has been shown to be able to achieve improved parallel performance over existing conservative and optimistic PDES kernels, as well as improved sequential performance over an existing central-event-list based kernel. This paper explains the modifications that have been made to TasKit to enable real-time operation along with the emulator interface that allows the IP network simulation running in the TasKit kernel to interact with real IP clients. Initial emulator performance data is included.

关键词： Discrete event simulation Emulation Kernel Computational modeling Computer simulation Communication system traffic control Traffic control Computer networks High-speed networks Internet

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parallel simulated annealing for the set-partitioning problem

Parallel simulated annealing for the set-partitioning proble...

引用

Euromicro workshop on parallel and distributed Processing

作者： Z.J. Czech Institute of Computer Science Silesian University of Technology Gliwice Poland

A delivery problem which reduces to the NP-complete set-partitioning problem is investigated. The sequential and parallel simulated annealing algorithms to solve the delivery problem are discussed. The objective is to... 详细信息

关键词： Simulated annealing Helium Vehicles Costs Computational modeling Computer simulation Computer science Postal services Transportation

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Slow memory: the rising cost of optimism

Slow memory: the rising cost of optimism

引用

workshop on Principles of Advanced and distributed simulation (PADS)

作者： R.A. Meyer J.M. Martin R.L. Bagrodia Computer Science Department University of California Los Angeles USA

Rapid progress in the design of fast CPU chips has outstripped progress in memory and cache performance. Optimistic algorithms would seem to be more vulnerable to poor memory performance because they require extra memory for state saving and anti-messages. We examine the performance of both optimistic and conservative protocols in controlled experiments to evaluate the effects of memory speed and cache size, using a variety of applications.

关键词： Cost function Atherosclerosis Electrical capacitance tomography Protocols Time warp simulation Computer science Hip Reactive power Discrete event simulation Hardware

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Analytic performance model for speculative, synchronous, discrete-event simulation

Analytic performance model for speculative, synchronous, dis...

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： B.L. Noble R.D. Chamberlain Department of Electrical and Computer Engineering Southern Illinois University Edwardsville Edwardsville IL USA Computer and Communications Research Center Department of Electrical Engineering Washington University St Lucia MO USA

Performance models exist that reliably describe the execution time and efficiency of parallel discrete-event simulations executed in a synchronous iterative fashion. These performance models incorporate the effects of processor heterogeneity, other processor load due to shared computational resources, application workload imbalance, and the use of speculative computation. This includes modeling the effects of predictive optimism, a technique for improving the accuracy of speculative assumptions. We extend these models to incorporate correlated workloads across the set of processors and validate the models with two different applications.

关键词： Performance analysis Discrete event simulation Computational modeling Iterative algorithms Concurrent computing Predictive models Very large scale integration Logic Computer applications parallel processing

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Strategies for success in parallel simulation applications

Strategies for success in parallel simulation applications

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： F. Wieland Center for Advanced Aviation Systems Development MITRE Corporation McLean VA USA

Summary form only given. While the PADS community has traditionally focused on, and done a great job with, the technical aspects of developing simulations that run fast and can be connected to other simulations, it has paid little or no attention to the overall strategies required to produce a marketable, useful, and successful parallel simulation. This lack of market focus has led to many fears of the demise of the PADS community, complaints of its lack of general acceptance by the broader simulation community and predictions that it will become merely another venue for simulation interconnection. These fears, complaints, and predictions are unnecessary. There are several examples of successful parallel simulations, in domains as far apart as aviation modeling and wargames. What can we learn from their successes? How can we translate their general acceptance into other parallel simulation domains? Are there market opportunities that we are missing? In short, what is the parallel simulation community lacking, and what does it need to do in order to be more successful? The purpose of the article is to begin a discussion on the answers to these questions (as opposed to definitively answering them). We draw on numerous examples of successful applications, and make some concrete suggestions for furthering the community.

关键词： Biological system modeling Atherosclerosis Ear Predictive models Time warp simulation Birth disorders Read only memory Concrete Operating systems Physics

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Locality-preserving load-balancing mechanisms for synchronous simulations on shared-memory multiprocessors

Locality-preserving load-balancing mechanisms for synchronou...

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： Voon-Yee Vee Wen-Jing Hsu Centre for Advanced Information Systems Nanyang Technological University Singapore

Many synchronous algorithms have been proposed for parallel and discrete simulations. However the actual performance of these algorithms has been far from ideal, especially when event granularity is small. Barring the case of low parallelism in the given simulation models, one of the main reasons of low speedups is in the uneven load distribution among processors. We present several new locality-preserving load balancing mechanisms for synchronous simulations on shared-memory multiprocessors. We show both theoretically and empirically that some of these mechanisms incur very low overhead. The results confirm that one of the new mechanisms is indeed more efficient and scalable than common existing approaches.

关键词： Load management Discrete event simulation Information systems Synthetic aperture sonar Iterative algorithms

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parallelizing a sequential logic simulator using an optimistic framework based on a global parallel heap event queue: an experience and performance report

Parallelizing a sequential logic simulator using an optimist...

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： S.K. Prasad N. Junankar Computer Science Department Georgia State University Atlanta USA

We have parallelized the Iowa Logic Simulator a gate-level fine-grained discrete-event simulator by employing an optimistic algorithm framework based on a global event queue implemented as a parallel heap. The original code and the basic data structures of the serial simulator remained unchanged. Wrapper data structures for the logical processes (gates) and the events are created to allow roll-backs, all the earliest events at each logical processes are stored into the parallel heap, and multiple earliest events are simulated repeatedly by invoking the simulate function of the serial simulator. The parallel heap allowed extraction of hundreds to thousands of earliest events in each queue access. On a bus-based shared-memory multiprocessor simulation of synthetic circuits with 250,000 gates yielded speedups of 3.3 employing five processors compared to the serial execution time of the Iowa Logic Simulator and limited the number of roll-backs to within 2,000. The basic steps of parallelization are well-defined and general enough to be employable on other discrete-event simulators.

关键词： Discrete event simulation Circuit simulation Computational modeling Computer simulation Data structures Protocols Concurrent computing Computer science Logic circuits Circuit testing

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Network aware time management and event distribution

Network aware time management and event distribution

引用

workshop on Principles of Advanced and distributed simulation (PADS)

作者： G.F. Riley R. Fujimoto M.H. Ammar College of Computing Georgia Institute of Technology Atlanta GA USA Georgia Institute of Technology Atlanta GA US

We discuss new synchronization algorithms for parallel and distributed discrete event simulations (PDES) which exploit the capabilities and behavior of the underlying communications network. Previous work in this area has assumed the network to be a black box which provides a one-to-one, reliable and in-order message passing paradigm. In our work, we utilize the broadcast capability of the ubiquitous Ethernet for synchronization computations, and both unreliable and reliable protocols for message passing, to achieve more efficient communications between the participating systems. We describe two new algorithms for computation of a distributed snapshot of global reduction operations on monotonically increasing values. The algorithms require O(N) messages (where N is the number of systems participating in the snapshot) in the normal case. We specifically target the use of this algorithm for distributed discrete event simulations to determine a global lower bound on time-stamp (LETS), but expect the algorithm has applicability outside the simulation community.

关键词： Protocols Discrete event simulation Ethernet networks Computational modeling distributed computing Telecommunication network reliability Broadcasting Communication networks Message passing Pervasive computing

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