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

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Reproducible testing of distributed software with middleware virtualization and simulation

Reproducible testing of distributed software with middleware...

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6th workshop on parallel and distributed Systems: Testing, Analysis, and Debugging 2008, PADTAD'08

作者： Briquet, Cyril De Marneffe, Pierre-Arnoul Department of Electrical Engineering and Computer Science University of Liège Montefiore Institute B37 B-4000 Liège Belgium

ISBN: (纸本)9781605580524

P2P Grids are Grids organized into P2P networks where participant exchange computing time so as to complete computational tasks. Evaluating the performance of scheduling algorithms enables one to deploy those that are efficient. Performance is often evaluated experimentally or through simulation because these algorithms (typically heuristics) are too complex to model analytically. Testing the implementation of P2P Grid middleware before it is deployed is also important: Reproducing configurations or conditions that lead to unexpected outcomes is thus valuable. A P2P Grid environment exhibits multiple sources of failure and is typically dynamic and uncontrollable. Reproducing even basic behavior of Grid nodes in a controllable and repeatable manner is thus exceedingly difficult. Such lack of control over the environment is a major challenge in the software engineering of P2P Grid middleware [7]. Simulators have been proposed to evaluate the performance of scheduling algorithms, but are often limited in scope, reusability and accuracy, i.e. they rely on simplified models. We introduce a software engineering pattern - that we call code once, deploy twice - to both reduce the distance between simulated and implemented algorithms and reproduce, at will, Grid configurations and environments: A simulator implementation of a Grid architecture is built by virtualizing its middleware implementation. An immediate benefit is that most of the code can be reused between both implementations;only communications between Grid nodes, multithreading within Grid nodes and actual task execution are coded differently. As a derived benefit, most of the code of the middleware can be tested within the controlled environment of the simulator, before it is deployed as-is. Another benefit is high simulation accuracy. We describe the implementation of a P2P Grid following the code once, deploy twice pattern, that we believe is also relevant to other Grid types (certainly Volunteer Grids [5, 4]

关键词： Middleware

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Design issues in parallel array languages for shared memory

Design issues in parallel array languages for shared memory

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8th SAMOS International workshop

作者： Brodman, James Fraguela, Basilio B. Garzaran, Maria J. Padua, David Univ Illinois Dept Comp Sci 201 N Goodwin Ave Urbana IL 61801 USA Univ A Coruna Dept Elect & Sistemas Coruna 15071 Spain

ISBN: (纸本)9783540705499

The Hierarchically Tiled Array (HTA) is a data type that facilitates the definition and manipulation of arrays partitioned into tiles. The data type allows to exploit those tiles to attain both locality and parallelism. parallel programs written with HTAs are based in data parallelism, and provide the programmer with a single-threaded view of the execution. In our experience, HTAs help to develop parallel codes in a. much more productive way than other parallel prograrmning approaches. While we have worked extensively with HTAs in distributed mernor,y environments, only recently have we began to consider their adaption to shared memory environments such as those found in rriulticore systems. In this paper we review the design issues, opportunities and challenges that this migration raises.

关键词： parallel programming data parallelism tiling shared memory

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Using reversible computation techniques in a parallel optimistic simulation of a multi-processor computing system 07

Using reversible computation techniques in a parallel optimi...

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21st International workshop on Principles of Advanced and distributed simulation (PADS 2007)

作者： Naborskyy, Andriy Fujimoto, Richard M. Georgia Inst Technol Coll Comp Atlanta GA 30332 USA

ISBN: (纸本)9780769528984

A study is presented in applying optimistic parallel discrete event simulation techniques using reverse execution to perform instruction-level simulations of distributed memory multi-processor systems. A static program analysis approach is described to optimize pre-processed simulated applications in order to remove certain overheads associated with forward event execution and to enable reversible execution. Reverse execution of floating point operations are also considered. Preliminary performance measurements are presented indicating this approach offers promise in speeding up parallel multi-processor simulations.

关键词： Concurrent computing Computational modeling Discrete event simulation Computer aided instruction Analytical models distributed computing Performance analysis Multiprocessing systems High level languages Computer simulation

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parallel simulation of hybrid network traffic models 07

Parallel simulation of hybrid network traffic models

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21st International workshop on Principles of Advanced and distributed simulation (PADS 2007)

作者： Liu, Jason Colorado Sch Mines Dept Math & Comp Sci Golden CO 80401 USA

ISBN: (纸本)9780769528984

We examine a parallel processing method for simulations of large-scale networks with a hybrid traffic representation combining both a time-stepped fluid model and a discrete-event packet-oriented model. This method benefits from the observation that the time it takes to propagate-fluid characteristics along the path taken by the traffic flows has a lower bound equal to the minimum link delay as manifested by the governing ordinary differential equations (ODEs). A better lookahead can thus be used to allow parallel simulation of the hybrid model to run without more synchronization overhead than the corresponding discrete-event packet-oriented model. We derive an analytical model comparing the fluid model and the packet-oriented model both for sequential and parallel simulations. We demonstrate the benefit of the parallel hybrid model through a series of simulation experiments of a large-scale network consisting of over 170,000 hosts and 1.6 million traffic flows on a small parallel cluster.

关键词： Telecommunication traffic Traffic control Computational modeling Computer simulation Discrete event simulation Computer networks Large-scale systems Differential equations Fluid flow Concurrent computing

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Local Time Warp: An implementation and performance analysis 07

Local Time Warp: An implementation and performance analysis

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21st International workshop on Principles of Advanced and distributed simulation (PADS 2007)

作者： Rajaei, Hassan Bowling Green State Univ Dept Comp Sci Bowling Green OH 43403 USA

ISBN: (纸本)9780769528984

The Local Time Warp (LTW) model was one of the novel approaches to distributed simulation presented in early 90s. While several similar schemes had emerged afterwards, no implementation and performance analysis of LTW were offered. This paper provides an implementation and performance analysis of the Local Time Warp model on a Beowulf Cluster using Message Passing Interface (MPI). Cluster computing matches well with the Local Time Warp model due to its partitioning of the simulation entities and assigning them to clusters of processors. This paper presents a distributed simulation engine called BG-LTW which is a clustered-based implementation of the model. Further, the implementation features and its performance are provided. The obtained results suggest that for large-scale simulations local time warp outperforms its global counterpart.

关键词： Performance analysis Object oriented modeling Computational modeling Time warp simulation Engines parallel processing Large-scale systems Protocols Grid computing Computer science

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An efficient sort-based DDM matching algorithm for HLA applications with a large spatial environment 07

An efficient sort-based DDM matching algorithm for HLA appli...

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21st International workshop on Principles of Advanced and distributed simulation (PADS 2007)

作者： Pan, Ke Turner, Stephen John Cai, Wentong Li, Zengxiang Nanyang Technol Univ Sch Comp Engn Parallel & Distributed Comp Ctr Singapore 639798 Singapore

ISBN: (纸本)9780769528984

simulation is a low cost and safe alternative to solve complex problems in various areas. To promote reuse and interoperability of simulation applications and link geographically dispersed simulation components, distributed simulation was introduced. The High Level Architecture (HLA) is the IEEE standard for distributed simulation. To optimize communication efficiency between simulation components, HLA defines a Data Distribution Management (DDM) service group for filtering out unnecessary data exchange. It relies on the computation of overlap between update and subscription regions, which is called matching. In this paper we propose an efficient sort-based DDM matching algorithm for HLA applications with a large spatial environment. A theoretical analysis of our algorithm concludes that it should have good storage and computational scalability. The experimental results have verified the theoretical conclusions by showing that our algorithm has much less storage requirement than the original sort-based matching algorithm and generally has the best computational performance when compared with region-based and the original sort-based matching algorithms.

关键词： distributed decision making Computational modeling Subscriptions Routing Costs distributed computing Computer architecture Filtering Concurrent computing Algorithm design and analysis

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GPU-accelerated evaluation platform for high fidelity network modeling 07

GPU-accelerated evaluation platform for high fidelity networ...

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21st International workshop on Principles of Advanced and distributed simulation (PADS 2007)

作者： Xu, Zhiguo Bagrodia, Rajive Univ Calif Los Angeles Dept Comp Sci Mobile Syst Lab Los Angeles CA 90024 USA

ISBN: (纸本)9780769528984

High-fidelity simulations of mixed wired and wireless network systems are dependent on detailed simulation models, especially in the lower layers of the network stack. However detailed modeling can result in prohibitive computation cost. In recent years, commercial graphics cards (GPUs) have drawn attention from the general computing community due to the superior computation capability. In this paper we present our experience with using commercial graphics cards to speed up execution of network simulation models. First, we propose a general simulation framework supporting GPU-accelerated simulation models. Software abstraction is designed to facilitate the use and development of GPU-based models. Second, we implement and evaluate two simulation models using GPUs. We observed that using the GPUs can yield significant performance improvements for large configurations of the model, as compared with pure CPU-based computations, with no degradation in the accuracy of the results. This benefit is particularly impressive for models that include significant data parallel computations. However we also observed that the overhead introduced by GPUs make them less effective in improving execution time of other net-work models. This study suggests that besides parallel computing and grid computing, network simulations can also be scaled by reaping computation capability of GPUs and, potentially, other external computational hardware.

关键词： Computational modeling Concurrent computing Grid computing Graphics Computer networks Wireless networks Computational efficiency Software design Degradation parallel processing

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A study about the mapping of process-processor based on Petri nets

A study about the mapping of process-processor based on Petr...

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8th ACIS International Conference on Software Engineering, Artificial Intelligence, Networking and parallel/distributed Computing/3rd ACIS International workshop on Self-Assembling Wireless Networks

作者： Fang Xianwen Xu Zhicai Yin Zhixiang Anhui Univ Sci & Technol Dept Math & Phys Huainan 232001 Peoples R China Chuzhou Univ Chuzhou 239012 Peoples R China

ISBN: (纸本)9780769529097

In the design and analysis of discrete event systems, the validation of their models is often addressed via simulation. Petri nets have been applied widely Lookahead computation is a good method that improves the distributed simulation performance of Timed Transition Petri Nets (TTPN). The approach is based on a part of optimism computed on the prediction time each logical process can determine for its advancement. Timed Petri nets meet these requirements, and use the lookahead to analyze the TTPN model for finding the concurrency and blocking structure, thereby making certain the logical process (LP). Based on the specialties of lookahead, the lookahead was applied in parallel simulation, and acquire the sufficient condition about the TTPN model existing concurrency According to the condition parallel program can be partitioned into several logical processes, and the partition algorithm that can decide quickly the mapping project on the mapping process-processor is presented.

关键词： timed Petri nets lookahead distributed processing logical process mapping

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Multi-path-based distributed TCP caching for wireless sensor networks

Multi-path-based distributed TCP caching for wireless sensor...

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8th ACIS International Conference on Software Engineering, Artificial Intelligence, Networking and parallel/distributed Computing/3rd ACIS International workshop on Self-Assembling Wireless Networks

作者： Liu, Yuhua Huang, Hao Xu, Kaihua Cent China Normal Univ Dept Comp Sci Wuhan 430079 Peoples R China

ISBN: (纸本)0769529097

The paper investigates some important transport layer algorithms for wireless sensor networks. On the basis of the single-path-based distributed TCP caching, which work badly when some node on the path be down, adopt multi-path routing on the network layer and distributed TCP caching on the transport layer to enhance transport reliability. From the simulation results, it improves overall performance in term of end-to-end transport delay comparing with the original DTC algorithm and loads are distributed among the intermediate nodes. And then address some open issues as the research prospects.

关键词： Cache memory

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A dynamic reconfigurable adaptive software architecture for federate in HLA-based simulation

A dynamic reconfigurable adaptive software architecture for ...

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8th ACIS International Conference on Software Engineering, Artificial Intelligence, Networking and parallel/distributed Computing/3rd ACIS International workshop on Self-Assembling Wireless Networks

作者： Hu, Yang Hang, Chen Northwestern Polytech Univ Coll Marine Xian 710072 Peoples R China

ISBN: (纸本)9780769529097

As High Level Architecture (HLA) standard widely used in underwater warfare simulation applications, it is imperative that we should meet the need for the adaptation to the changing warfare requirements and improve development efficiency and reusability of simulation software, especially when developing a federate, known as a node in HLA-based distributed simulation. To address this problem, we present a dynamic reconfigurable adaptive software architecture for federate in this paper. The architecture has capability of self-adaptation to simulation requirements, and separates function realization from configuration control. It is composed of four layers, interface communication, requirement management, adaptation management and function realization. In this architecture, we partition the federate into several functional parts in terms of a definite granularity with Component-Based Software Development (CBSD) methodology. The architecture can adjust dynamically the configuration of federate to the new requirements while the simulation requirements change. Finally, we take a general sonar federate as an example to illustrate the presented architecture's support for adaptation.

关键词： Software architecture

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