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Filtering and scalability in the ECO distributed event model

Filtering and scalability in the ECO distributed event model

引用

5th international symposium on Software Engineering for parallel and distributed Systems (PDSE 2000)

作者： Haahr, M Meier, R Nixon, P Cahill, V Jul, E Trinity Coll Dept Comp Sci Distributed Syst Grp Dublin Ireland

ISBN: (纸本)0769506348

Event-based communication is useful in many application domains, ranging from small, centralised applications to large, distributed systems. Many different event models have been developed to address the requirements of different application domains. One such model is the ECO model which was designed to support distributed virtual world applications. Like many other event models, ECO has event filtering capabilities meant to improve scalability by decreasing network traffic in a distributed implementation. Our recent work in event-based systems has included building a fully distributed version of the ECO model, including event filtering capabilities. this paper describes the results of our evaluation of filters as a means of achieving increased scalability in the ECO model. the evaluation is empirical and real data gathered from an actual event-based system is used. the findings show filters to be highly valuable in making distributed implementations of the model scab, that multicast contributes to the scalability and perhaps most significantly, that multicast groups can be dynamically generated from filters using local (per node) rather global knowledge of the distributed application.

关键词： distributed computer systems

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Full-rate distributed space-time coding for bi-directional cooperative communications

Full-rate distributed space-time coding for bi-directional c...

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IEEE 5th international symposium on Wireless Pervasive computing 2010, ISWPC 2010

作者： Phan, Hoc Duong, Trung Q. Zepernick, Hans-Jürgen Blekinge Institute of Technology SE-372 25 Ronneby Sweden

ISBN: (纸本)9781424468584

In this paper, a protocol for bi-directional cooperative communications applying full-rate distributed space-time codes and physical network coding is proposed. this scheme uses L relays to transmit the codewords in a distributed fashion. It takes 3 time slots for two sources to transmit two corresponding codewords by exploiting physical network coding and selfinterference cancelation at each source. We prove that this scheme obtains full diversity. the analytical results show that the diversity order of this scheme will be L + 1, where L is the number of relays. In addition, we assess the sum-rate of the bi-directional cooperative communication scheme and reveal that it achieves larger spectral efficiency compared to one-way cooperative communication scheme. We employ Monte Carlo simulations to validate the symbol error rate and the ergodic sum-rate of the scheme. ©2010 IEEE.

关键词： Cooperative communication

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Robust and distributed genetic algorithm for ordering problems

Robust and distributed genetic algorithm for ordering proble...

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Proceedings of the 1996 5th IEEE international symposium on High Performance distributed computing

作者： Kumar, Anup Srivastava, Alok Singru, Aditi Ghosh, R.K. Univ of Louisville Louisville KY United States

this paper presents a distributed Genetic Algorithm implementation for obtaining good quality consistent results for different ordering problems. Most importantly, the solution found by the proposed distributed GA is not only of high-quality but also robust and does not require fine-tuning of the probabilities of crossover and mutation. In addition, implementation of the distributed GA is simple and does not require the use of any specialized, expensive hardware. Fault tolerance has also been provided by dynamic reconfiguration of the distributed system in the event of a process or machine failure. the effectiveness of using a simple crossover scheme with distributed GA is demonstrated by solving three variations of the Traveling Salesman Problem (TSP).

关键词： Genetic algorithms

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Jammer localization in wireless sensor networks

Jammer localization in wireless sensor networks

引用

5th international Conference on Wireless Communications, Networking and Mobile computing, WiCOM 2009

作者： Yanqiang, Sun Xiaodong, Wang National Laboratory for Parallel and Distributed Processing National University of Defense Technology Changsha China

ISBN: (纸本)9781424436934

Jamming style Denial-of-Service attack is the transmission of radio signals that disrupt communications by decreasing the signal to noise ratio. this kind of attack can be easily launched by jammer through either bypassing MAC-layer protocols or emitting a radio signal targeted at blocking a particular channel. In this paper, we consider the item of localizing a jammer in which little work has been done. First we explored the existing localization algorithms that have been used in wireless sensor networks. We then proposed a Geometry-Covering based Localization (GCL) algorithm, which utilizes the knowledge of computing geometry, especially the convex hull. Simulation results showed that GCL is able to achieve higher accuracy than Centroid Localization, and has the time complexity of O (nlogn) , which is proper to sensor networks. ©2009 IEEE.

关键词： Geometry

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Automatic parallel I/O performance optimization using genetic algorithms 7

Automatic parallel I/O performance optimization using geneti...

引用

7th international symposium on High Performance distributed computing

作者： Chen, Y Winslett, M Cho, Y Kuo, S IBM Corp Almaden Res Ctr Dept Comp Sci San Jose CA 95120 USA

ISBN: (纸本)0818685794

the complexity of parallel I/O systems imposes significant challenge in managing and utilizing the available system resources to meet application performance, portability and usability goals. We believe that a parallel I/O system that automatically selects efficient I/O plans for user applications is a solution to this problem. In this paper, we present such an automatic performance optimization approach for scientific applications performing collective I/O requests on multidimensional arrays. the approach is based on, a high level description of the target workload and execution. environment characteristics, and applies genetic algorithms to select high quality I/O plans. We have validated this approach in the Panda parallel I/O library. Our performance evaluations on the IBM SP show that this approach can, select high quality I/O plans under a variety of system conditions with a low overhead, and the genetic algorithm-selected I/O plans are in general better than the default plans used in Panda.

关键词： Genetic algorithms

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Measuring RPC traffic in an OS/2 DCE environment

Measuring RPC traffic in an OS/2 DCE environment

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5th international symposium on Modeling, Analysis and Simulation of Computer and Telecommunication Systems

作者： Sun, Y Bunt, R Oster, G Univ of Saskatchewan Saskatoon Canada

ISBN: (纸本)0818677589

distributed computing involves systems that operate across networks transparently, using the resources of multiple machines. the Open Software Foundation's distributed computing Environment (DCE) has evolved to address the need for a vendor-neutral platform to which distributed applications can be developed, and upon which they can run. Central to the design philosophy of DCE is its reliance on the Remote Procedure Call (RPC) to facilitate communication among the entities in the distributed environment. Since it profoundly affects the performance of both the DCE environment and applications running on top of it, the performance of RPCs is very much a concern of both application developers and system managers in a DCE installation this short paper reports some results from an ongoing empirical investigation of the OS/2 DCE RPC facility. Our interest in this project is the effect on end-to-end RPC performance of protocol processing, flow control mechanisms within DCE, other load on the network, and interoperation with multiple DCE platforms.

关键词： distributed computer systems

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Improving the Productivity of distributed Computer Systems through the Use of Knowledge Engineering 5

Improving the Productivity of Distributed Computer Systems t...

引用

5th IEEE international symposium on Smart and Wireless Systems within the international Conferences on Intelligent Data Acquisition and Advanced computing Systems, IDAACS-SWS 2020

作者： Kulykovska, Nataliia Kudermetov, Ravil National University Zaporizhzhia Polytechnic Zaporizhzhia69063 Ukraine

ISBN: (纸本)9781728199603

To solve the problem of improving the productivity of distributed computer systems, special systems are being developed to assess the performance of individual nodes, errors in the composition of services, time delays, etc. the expert can decide to optimize the system based on these data. this paper proposes the use of knowledge engineering tools in systems development. the proposed construction methodology is to present semantic descriptions of all existing nodes in the system. Service ontologies allow you to develop systems that can accumulate expert knowledge to identify common system performance issues and ways to address them. A software environment for working with ontologies and knowledge base was developed in the process of performing this work. the knowledge base for identification of typical problems of productivity of services, described with use of the offered models and methods is developed. the results of the study of the developed models, methods and tools in the analysis of service performance have shown their effectiveness. © 2020 IEEE.

关键词： Productivity

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A distributed computing environment for multidisciplinary design

A distributed computing environment for multidisciplinary de...

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5th symposium on Multidisciplinary Analysis and Optimization, 1994

作者： Weston, R.P. Townsend, J.C. Eidson, T.M. Gates, R.L. Multidisciplinary Design Optimization Branch NASA Langley Research Center HamptonVA23681-0001 United States High Technology Corporation HamptonVA23666 United States Computer Sciences Corporation HamptonVA23666 United States

the Framework for Interdisciplinary Design Optimization (FIDO) project has the goal of developing a general distributed computing system for executing multidisciplinary computations on a networked heterogeneous cluster of workstations and vector and massively parallel computers. the concept being used for FIDO is course-grained parallelism, with instances of disciplinary codes (aerodynamics, structures, etc. for an airplane design problem) running on separate processors (including fine-grain parallel computers), under control of an executive on another processor, and exchanging data through a centralized data manager (on yet another processor). To allow the user to monitor the progress of the design iterations, the system includes a graphical user interface (which tracks the execution of codes performing the design iterations) and a separate process, called Spy, which allows a user to extract and plot data produced during current and previous design cycles, and then to steer the design process by changing appropriate control data. the software is written in modular form to ease migration to upgraded or completely new problems. In its current state of development, FDO is being applied to a highly simplified case of a High-speed Civil Transport design, involving a simplified problem with very few design variables. However, it has already demonstrated the ability to coordinate multidisciplinary computations and communications in a heterogeneous distributed computing system. © 1994 by the American Institute of Aeronautics and Astronautics, Inc.

关键词： Graphical user interfaces

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Random walk spread and search in unstructured P2P

引用

5th international Conference on parallel and distributed computing

作者： Jia, ZQ Rao, RN Li, ML You, JY Shanghai Jiao Tong Univ Dept Comp Sci & Engn Shanghai 200030 Peoples R China

ISBN: (纸本)3540240136

Unstructured Peer-to-Peer applications are very popular on the Internet. An efficient technique for improving performance of search method of these systems is to replicate file location information in P2P. In this paper we present random walk spread mechanism, and random walk spread and search method. Simulation results show that it achieves high success rates at low cost.

关键词： distributed computer systems

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A generic approach to structuring and implementing complex fault-tolerant software 5

A generic approach to structuring and implementing complex f...

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5th IEEE international symposium on Object-Oriented Real-Time distributed computing (ISORC 2002)

作者： Xu, J Randell, B Romanovsky, A Univ Durham Durham DH1 3LE England

ISBN: (纸本)0769515584

this paper addresses the practical implementation of means of tolerating residual software faults in complex software systems, especially concurrent and distributed ones. there are several inherent difficulties in implementing such fault-tolerant software systems, including the controlled use of extra redundancy and the mixture of different design concerns. In an attempt to minimise these difficulties, we present a generic implementation approach, composed of a multi-layered reference architecture, a configuration method and an architectural pattern. We evaluate our implementation approach using an industrial control application whose control software we equip with the ability to tolerate a variety of software faults. the preliminary evidence shows that our approach can simplify the implementation process, reduce repetitive development effort and provide high flexibility through a generic interface for a wide range of fault tolerance schemes.

关键词： architectural patterns concurrent and distributed systems coordinated atomic actions faulttolerant software object orientation

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