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A model for parallel simulation of distributed shared memory

A model for parallel simulation of distributed shared memory

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International Symposium on Modeling, Analysis and simulation of Computer and Telecommunication Systems (MASCOTS)

作者： L. Barriga M. Brorsson R. Ayani Department of Teleinformatics Royal Institute of Technology KTH Kista Sweden Department of Computer Engineering Lund University Lund Sweden

We present an execution model for parallel simulation of a distributed shared memory architecture. The model captures the processor-memory interaction and abstracts the memory subsystem. Using this model we show how parallel, on-line, partially-ordered memory traces can be correctly predicted without interacting with the memory subsystem. We also outline a parallel optimistic memory simulator that uses these traces, finds a global order among all events, and returns correct data and timing to each processor. A first evaluation of the amount of concurrency that our model can extract for an ideal multiprocessor shows that processors may execute relatively long instruction sequences without violating the causality constraints. However parallel simulation efficiency is highly dependent on the memory consistency model and the application characteristics.

关键词： Discrete event simulation Electronic mail Memory architecture Abstracts Predictive models Timing Data mining parallel machines Multiprocessor interconnection networks Protocols

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Modeling and simulation in reactive systems

Modeling and simulation in reactive systems

引用

workshop on parallel and distributed Real-Time Systems

作者： M. Boasson Hollandse Signaalapparaten B.V. Hengelo Netherlands

In currently-used paradigms for system development, knowledge about the objects in the system's environment is used to derive algorithms that relate events in the environment to actions. This results in implicit representation of the original knowledge in the operational system. In the majority of cases, there are only very limited mechanisms for controlling these built-in behaviours, whereas for powerful decision support it is essential to be able to "experiment" both with various hypotheses about the behaviour of real-world entities and with the system's own possible actions. Such simulation-like operation necessitates an explicit representation of behavioural models. A new paradigm for the development of reactive systems is therefore proposed in which the behavioural models are explicitly represented and the user of the system is given direct control over these models. This allows the user to easily express both hypotheses about the intentions of real-world entities, and the system's own potential actions that are necessary to meet the mission goals. Through the control of simulated time, the possible evolutions of the environment can then be studied directly.

关键词： Command and control systems Decision making Time factors Man machine systems distributed decision making Displays User interfaces

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Ab-initio molecular dynamics calculations: a parallel implementation of the Car-Parrinello method

Ab-initio molecular dynamics calculations: a parallel implem...

引用

Euromicro workshop on parallel and distributed Processing

作者： R. Di Felice M.L. Mantovani C.M. Bertoni INFM-Dipartimento di Fisica Universitá di Roma Tor Vergata Roma Italy CICAIA-Universitá di Modena Modena Italy INFM-Dipartimento di Fisica Universitá di Modena e Reggio Emilia Modena Italy

We present a parallel implementation of the Car-Parrinello method (1985) for first principles molecular dynamics simulations, in the parallel Virtual Machine (PVM, version 3.3.4) environment on the CRAY-T3D computer. parallelism is achieved at the Single Program Multiple Data (SPMD) level, dividing among processors the calculations on different columns of a large matrix, containing the electronic wavefunctions of a condensed matter system object of the simulation, written in a plane-wave basis. Fast Fourier Transforms (FFTs) of these electronic states are the heaviest computations in the program. Communications are avoided an most of the code, except where the columns must be orthogonalized among each other. Even if it is not possible to make parallel the whole code, we have reached a parallel implementation of the most time-consuming part. We get an excellent behaviour of this part, and a satisfactory global behaviour.

关键词： Electrons Computational modeling Computer simulation Equations Virtual machining Concurrent computing parallel processing Solid modeling Amorphous materials Monte Carlo methods

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A platform for real-time visualization and interactive simulation of large multimedia networks

A platform for real-time visualization and interactive simul...

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workshop on parallel and distributed Real-Time Systems

作者： M.C. Chan G. Pacifici R. Stadler Center for Telecommunications Research Columbia University New York NY USA IBM Thomas J. Watson Research Center Hawthorne NY USA

Presents a platform for developing and evaluating control systems for emerging multimedia networks. The platform allows us to closely approximate the functional and dynamic behavior of network control systems. By providing support for real-time visualization and interactive emulation, it can be used to study multimedia networks in various scenarios, such as different load patterns, network sizes and management operations. The current implementation runs on a KSR-1 and an SP2 parallel processor which are connected to a graphics workstation via ATM links.

关键词： Visualization Control systems Emulation Multimedia systems Real time systems System testing Kernel Telecommunication control Workstations Monitoring

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Prefetching and caching for query scheduling in a special class of distributed applications

Prefetching and caching for query scheduling in a special cl...

引用

International Conference on parallel Processing (ICPP)

作者： A. Sinha C. Chase Parallel and Distributed Systems Laboratory Electrical and Computer Engineering University of Texas Austin Austin TX USA

We analyze the scheduling aspects of database queries submitted to an abstract model of a very large distributed system. The essential elements of this model are: (a) a finite number of identical processing nodes with limited storage capacity, (b) a finite number of queries to be serviced, (c) a very large read-only data set that is shared by all queries and (d) a fixed inter-node communication latency. This framework models an important class of applications that use distributed processing of very large data sets. Examples of these applications exist in the very large database and multimedia problem domains. To meet the objective of minimizing flow time of queries while exploiting inter-query locality, various heuristics are proposed and evaluated through extensive simulation.

关键词： Prefetching Processor scheduling Application software Delay Multimedia databases Network servers Laboratories distributed databases distributed processing Computational modeling

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A performance evaluation methodology for parallel simulation protocols 96

A performance evaluation methodology for parallel simulation...

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proceedings of the tenth workshop on parallel and distributed simulation

作者： Vikas Jha Rajive Bagrodia Computer Science Department UCLA Los Angeles CA

ISBN: (纸本)9780818675393

Most experimental studies of the performance of parallel simulation protocols use speedup or number of events processed per unit time as the performance metric. Although helpful in evaluating the usefulness of parallel simulation for a given simulation model, these metrics tell us little about the efficiency of the simulation protocol used. In this paper, we describe an Ideal simulation Protocol (ISP), based on the concept of critical path, which experimentally computes the best possible execution time for a simulation model on a given parallel architecture. Since ISP computes the bound by actually executing the model on the given parallel architecture, it is much more realistic than that computed by a uniprocessor critical path analysis. The paper illustrates, using parameterized synthetic benchmarks, how an ISP-based performance evaluation can lead to much better insights into the performance of parallel simulation protocols than what would be gained from speedup graphs alone.

关键词： Experimental Performance Evaluation Null Message Protocol parallel and distributed simulation Critical Path

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Design of high level modelling / high performance simulation environments 96

Design of high level modelling / high performance simulation...

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proceedings of the tenth workshop on parallel and distributed simulation

作者： Bernard P. Zeigler Doohwan Kim AI and Simulation Group Department of Electrical and Computer Engineering University of Arizona Tucson AZ

ISBN: (纸本)9780818675393

Advances in massively parallel platforms are increasing the prospects for high performance discrete event simulation. Still the difficulty in parallel programming persists and there is increasing demand for high level support for building discrete event models to execute on such platforms. We present a parallel DEVS-based (Discrete Event System Specification) simulation environment that can execute on distributed memory multicomputer systems with benchmarking results of a class of high resolution, large scale ecosystem models. Underlying the environment is a parallel container class library for hiding the details of message passing technology while providing high level abstractions for hierarchical, modular DEVS models. The C++ implementation working on the Thinking Machines CM-5 demonstrates that the desire for high level modeling support need not be irreconcilable with sustained high performance.

关键词： distributed parallel simulation Containers Classes Geographical Information System Discrete Event System Specification Object-oriented Programming Watershed Modelling Connection Machine CM-5

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Performance modeling of heterogeneous distributed applications

Performance modeling of heterogeneous distributed applicatio...

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International Symposium on Modeling, Analysis and simulation of Computer and Telecommunication Systems (MASCOTS)

作者： C. Anglano Dipartimento di Informatica Universitá di Torino Italy

Heterogeneous network computing allows the development of a single complex application using a distributed network of machines; these machines may differ in terms of CPU and memory capacity and/or architecture and specialized functions. We present a modeling technique, based on generalized stochastic Petri nets (GSPNs), for the performance analysis of applications targeted to this class of systems (heterogeneous applications). We illustrate the use of the proposed technique by modeling and analyzing the CASA 3D-REACT heterogeneous application.

关键词： Computer networks distributed computing Computer architecture Petri nets Memory architecture Stochastic systems Performance analysis parallel processing Application software Software systems

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Conservative parallel simulation of ATM networks 96

Conservative parallel simulation of ATM networks

引用

proceedings of the tenth workshop on parallel and distributed simulation

作者： John G. Cleary Jya-Jang Tsai Department of Computer Science University of Waikato New Zealand

ISBN: (纸本)9780818675393

A new Conservative algorithm for both parallel and sequential simulation of networks is described. The technique is motivated by the construction of a high performance simulator for ATM networks. It permits very fast execution of models of ATM systems, both sequentially and in parallel. A simple analysis of the performance of the system is made. Initial performance results from parallel and sequential implementations are presented and compared with comparable results from an optimistic TimeWarp based simulator. It is shown that the conservative simulator performs well when the "density" of messages in the simulated system is high, a condition which is likely to hold in many interesting ATM scenarios.

关键词： parallel simulation ATM Networks

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The Annai/PMA performance monitor and analyzer

The Annai/PMA performance monitor and analyzer

引用

International Symposium on Modeling, Analysis and simulation of Computer and Telecommunication Systems (MASCOTS)

作者： B.J.N. Wylie A. Endo Centro Svizzero di Calcolo Scientific Manno Switzerland Swiss Branch NEC European Supercomputer Systems Manno Switzerland

The Annai integrated tool environment helps exploit the inherent power of distributed-memory parallel computers with standardized languages and convenient programming support. Portable application development is supported in High Performance Fortran and/or with explicit message-passing, using MPI as the machine interface. Integration within a unified tool environment allows the performance monitor and analyzer (PMA) component to interact with source code browsers and the loaded executable on the same terms as when using the parallel debugger. Data distribution and other program information furnished by the parallelization support and compilation systems is also exploited for additional insight. Powerful, directed analysis and interactive graphical summaries address scalability, while detailed charts of the time-varying behavior of individual processes and communication events can also be browsed when desired, always retaining essential reference to the original program source code.

关键词： Performance analysis Debugging Concurrent computing parallel programming parallel processing Prototypes Computerized monitoring distributed computing Computer languages Testing

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