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

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distributed, parallel simulation of multiple, deliberative agents 00

Distributed, parallel simulation of multiple, deliberative a...

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proceedings of the fourteenth workshop on parallel and distributed simulation

作者： A. M. Uhrmacher K. Gugler Department of Computer Science Universität Ulm D-89069 Ulm Germany

ISBN: (纸本)9780769506678

Multi-agent systems comprise multiple, deliberative agents embedded in and recreating patterns of interactions. Each agent's execution consumes considerable storage and calculation capacities. For testing multi-agent systems, distributed parallel simulation techniques are required that take the dynamic pattern of composition and interaction of multi-agent systems into account. Analyzing the behavior of agents in virtual, dynamic environments necessitates relating the simulation time to the actual execution time of agents. Since the execution time of deliberative components can hardly be foretold, conservative techniques based on lookahead are not applicable. On the other hand, optimistic techniques become very expensive if mobile agents and the creation and deletion of model components are affected by a rollback. The developed simulation layer of JAMES (a Java Based Agent Modeling Environment for simulation) implements a moderately optimistic strategy which splits simulation and external deliberation into different threads and allows simulation and deliberation to proceed concurrently by utilizing simulation events as synchronization points.

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Efficient distributed simulation of a communication switch with bursty sources and losses 00

Efficient distributed simulation of a communication switch w...

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proceedings of the fourteenth workshop on parallel and distributed simulation

作者： A. S. McGough I. Mitrani Computing Science Department University of Newcastle Newcastle upon Tyne NE1 7RU

ISBN: (纸本)9780769506678

Algorithms for simulating an ATM switch on a distributed memory multiprocessor are described. These include parallel generation of bursty arrival streams, along with the marking and deleting of lost cells due to buffer overflows. These algorithms increase the amount of computation carried out independently by each processor, and reduce the communication between the processors. When the number of cells lost is relatively small, the run time of the simulation is approximately O(N/P), where N is the total number of cells simulated and P is the number of processors. The cells are processed in intervals of fixed length; that length affects the structure and the performance of the algorithms.

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Does multicast communication make sense in write invalidation traffic?

Does multicast communication make sense in write invalidatio...

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International Conference on parallel and distributed Systems (ICPADS)

作者： Hung-Chang Hsiao Chung-Ta King Department of Computer Science National Tsing Hua University Hsinchu Taiwan

In distributed shared memory (DSM) multiprocessors, a write operation requires multiple messages to invalidate the nodes which share and cache the memory block to be written. The resulting write stall time is a performance hurdle to such systems. One approach to efficient invalidation is to use multicast messages to reach the sharing nodes. We use application driven simulation to evaluate two multicast based invalidation schemes: dual path (X. Lin and L.M. Ni, 1993) and pruning (M.P. Malumbres et al., 1996). Based on our experimental settings, we found that multicast improves invalidation traffic for four of the six evaluated real applications. The remaining two programs are computation intensive, and multicast based validation is less effective. But since they induce bursty communication, we found that multicasts help to relieve the network congestion during those periods of time. Dual path performs a little better than pruning, because it is less sensitive to routing delay in the routers. We also found that cache size is an important design parameter for multicast based invalidation. It is more effective for DSM multiprocessors with large caches.

关键词： Multicast communication Computational modeling Delay Computer networks Routing Multicast algorithms Computer science Power system interconnection distributed computing Scalability

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Model structure and load balancing in optimistic parallel discrete event simulation 00

Model structure and load balancing in optimistic parallel di...

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proceedings of the fourteenth workshop on parallel and distributed simulation

作者： Tapas K. Som Robert G. Sargent IBM and Simulation Research Group Department of Electrical Engineering and Computer Science Syracuse University Syracuse NY Simulation Research Group Department of Electrical Engineering and Computer Science Syracuse University Syracuse NY

ISBN: (纸本)9780769506678

The concept of strong groups is introduced to describe the structure of simulation models. It is shown that logical processes within strong groups process at approximately the same rate and that different strong groups can progress at different rates. An algorithm based on the rates of the strong groups is presented to balance the load among the physical processors and for flow control.

关键词： flow control simulation model structure parallel simulation load balancing optimistic protocols

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Applying parallel discrete event simulation to network emulation 00

Applying parallel discrete event simulation to network emula...

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proceedings of the fourteenth workshop on parallel and distributed simulation

作者： Rob Simmonds Russell Bradford Brian Unger University of Calgary Canada University of Bath UK

ISBN: (纸本)9780769506678

The simulation of wide area computer networks is one area where the benefits of parallel simulation have been clearly demonstrated. Here 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 *** 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： critical channel traversing real-time simulation Internet protocol (IP) parallel discrete event simulation (PDES) computer network emulation conservative protocol

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Scalability issues in CORBA

Scalability issues in CORBA

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IEEE International workshop on Software Engineering for parallel and distributed Systems

作者： Manjula Rani Vijay Srinivas Janaki Ram Distributed Object Systems Lab Department of Computer Science & Engg Indian Institute of Technology Chennai India

Scalability is recognised as a primary factor to be considered in the design of distributed systems. The scalability of object-oriented middleware CORBA is becoming a major concern as it has emerged as a standard architecture for distributed object computing. In this paper, a systematic scalability analysis of the basic components of the CORBA specification is attempted. From this analysis, the Portable Object Adapter (POA) and the Implementation Repository (IR) are identified to influence the scale of a CORBA-based system. The specification of the POA provides enough feasibility for the application designer to handle scalability. The existing implementations of IR have a tradeoff between scalability and object migration. A scalable design of the IR is proposed which allows individual objects to migrate without compromising scalability. A performance comparison of the proposed model with existing IR designs is made using a simulation study.

关键词： Client-server systems

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A debugger for computational grid applications

A debugger for computational grid applications

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Heterogeneous Computing workshop

作者： R. Hood G. Jost MRJ Technology Solutions-Numerical Aerospace Simulation Division NASA Ames Research Center

The Portable parallel/distributed Debugger project at the NASA Ames Research Center has built a debugger for applications running on heterogeneous computational grids. It employs a client-server architecture to simplify the implementation, and its user interface has been designed to provide process control and state examination functions on computations with a large number of processes. The debugger can find processes participating in distributed computations even when those processes were not created under debugger control. In addition to working in a computational grid environment, these techniques also work on other distributed memory jobs, such as those initiated by "mpirun".

关键词： Computer applications Grid computing distributed computing NASA Concurrent computing Portable computers Computer architecture User interfaces Process design Process control

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Implementing and evaluating an efficient dynamic load-balancer for distributed molecular dynamics simulation

Implementing and evaluating an efficient dynamic load-balanc...

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International Conference on parallel Processing workshops (ICPPW)

作者： N. Sato J.-M. Jezequel UEC Japan IRISA France

Introduces and evaluates a new efficient dynamic load-balancing scheme for parallel molecular dynamics simulation on distributed memory machines. It decomposes a spatial domain of particles into disjoint parts, each of which corresponds with a processor and dynamically changes its shape to keep almost the same number of particles throughout simulation. In contrast to other similar schemes, ours requires no long-distance inter-processor communications but only those among adjacent processors (and, thus, little communication overhead), whereas it still guarantees fast reduction of load imbalance among the processors. It owes these advantages mainly to the following features. (1) The sufficiently correct global load information is effectively obtained with the stepwise propagation of appropriate information via nearest-neighbor communication. (2) In addition to the global load balancing, another load-balancing procedure is also invoked on each processor without global load information in order to suppress the rapid increase or decrease of loads. Thus, information from remote processors can provide reliable values even after a certain period of delay. To evaluate the effectiveness of our scheme, we have integrated our load balancer into the publicly-available NAMD simulation system, through replacing its built-in load-balancing component. Preliminary experiments on a cluster of workstations connected through Myrinet switches shows that it successfully reduces load imbalance and improves the simulation performance.

关键词： Shape Computational modeling High performance computing Nearest neighbor searches Delay Workstations Switches Biochemical analysis Performance analysis Chemical analysis

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Preliminary Investigations into distributed Computing Applications on a Beowulf Cluster 00

Preliminary Investigations into Distributed Computing Applic...

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proceedings of the Fourth IEEE International workshop on distributed simulation and Real-Time Applications

作者： Judd Tracy Ravishankar Palaniappan

ISBN: (纸本)9780769508375

In this paper, we examine various modeling and simulation applications of cluster computing using a Beowulf cluster. These applications are used to investigate the performance of our cluster in terms of computational speedup, scalability, and communications. The applications include solution of linear systems by Jacobi iteration, distributed image generation, and the finite difference time domain solution of Maxwell's equations. It is observed that the computational load for these applications must be large compared to the communication overhead to take advantage of the speedup obtained using parallel computing. For the applications reviewed here, this condition is increasingly satisfied as the problem size becomes larger or as higher resolution is required.

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Strategies for success in parallel simulation applications (keynote speech) 00

Strategies for success in parallel simulation applications (...

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proceedings of the fourteenth workshop on parallel and distributed simulation

作者： Frederick Wieland The MITRE Corporation Center for Advanced Aviation Systems Development McLean VA

ISBN: (纸本)9780769506678

While the PADS community has traditionally focused on—and done a greater 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 *** 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 this talk is to begin a discussion on the answers to these questions (as opposed to definitively answering them). We will draw on numerous examples of successful applications, and make some concrete suggestions for furthering the community.

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