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Optimal polling in communication networks

Optimal polling in communication networks

引用

international symposium on parallel and distributed Processing (IPDPS)

作者： A.A. Rescigno Dipartimento di Informatica ed Applicazioni Universiti di Salerno Baronissi Italy School of Computing Science Simon Fraser University Burnaby BC Canada

Polling is the process in which an issuing node of a communication network (polling station) broadcasts a query to every other node in the network and must receive a unique response from each of them. Polling can be thought as a combination of broadcasting and gathering and finds wide applications in the control of distributed systems. In this paper we consider the problem of polling in minimum time. We give a general lower bound on the minimum number of time units to accomplish polling in any network and we present optimal polling algorithms for several classes of graphs, including hypercubes and recursively decomposable Cayley graphs.< >

关键词： Intelligent networks Communication networks Tree graphs Broadcasting Computer networks databases distributed control Control systems Hypercubes Application software

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A classification of multi-database languages

A classification of multi-database languages

引用

international Conference on parallel and distributed Information systems

作者： M. Tresch M.H. Scholl IBM Almaden Research Center San Jose CA USA Faculty of Computer Science University of Ulm (EBS) Ulm Germany

This paper defines a formal classification of multi-database languages into five levels of database integration with increasing degree of global control and decreasing degree of local autonomy. First, the fundamental interoperability mechanisms are identified for each of these levels. Their consequences on local autonomy as well as implementation drawbacks are discussed. second, various multi-database languages are classified into these categories. In addition to COOL*, other proposals are analyzed, including SQL*Net, Multibase, Superviews, VODAK, Pegasus, and O*SQL.< >

关键词： Data models Database languages Database systems Computer science Transaction databases Proposals Information analysis Management information systems Data mining Data conversion

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Exploiting duplication to minimize the execution times of parallel programs on message-passing systems

Exploiting duplication to minimize the execution times of pa...

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international symposium on parallel and distributed Processing (IPDPS)

作者： Yu-Kwong Kwok I. Ahmad Department of Computer Science Hong Kong University of Science and Technology Hong Kong China

Communication overhead is one of the main factors that can limit the speedup of parallel programs on message-passing parallel architectures. This limiting factor is more predominant in distributed systems such as clusters of homogeneous or heterogeneous workstations. However, excessive communication overhead can be reduced by redundantly executing some of the tasks of a parallel program on which other tasks critically depend. We study the problem of duplication-based static scheduling of parallel programs on parallel and distributed systems. Previous duplication-based scheduling algorithms assumed the availability of unlimited number of homogeneous processors. We consider more practical scenarios: when the number of processors is limited, and when the system consists of heterogeneous computers. For the first scenario, we propose an algorithm which minimizes the execution of a parallel program by controlling the level of duplication according to the number of processors available. For the second scenario, we design an algorithm which simultaneously exploits duplication and processor heterogeneity to minimize the total execution time of a parallel program. The proposed algorithms are suitable for low as well as high communication-to-computation ratios.< >

关键词： Processor scheduling Scheduling algorithm Workstations Concurrent computing distributed computing Computer science parallel architectures Communication system control Algorithm design and analysis Computer architecture

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Coarse-grain parallel genetic algorithms: categorization and new approach

Coarse-grain parallel genetic algorithms: categorization and...

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international symposium on parallel and distributed Processing (IPDPS)

作者： Shyh-Chang Lin W.F. Punch E.D. Goodman Genetic Algorithm Research and Applications Group Case Center and Department of Computer Science Michigan State University USA Dept. of Comput. Sci. Michigan State Univ. East Lansing MI USA

This paper describes a number of different coarse-grain GA's, including various migration strategies and connectivity schemes to address the premature convergence problem. These approaches are evaluated on a graph partitioning problem. Our experiments showed, first, that the sequential GA's used are not as effective as parallel GA's for this graph partition problem. second, for coarse-grain GA's, the results indicate that using a large number of nodes and exchanging individuals asynchronously among them is very effective. Third, GA's that exchange solutions based on population similarity instead of a fixed connection topology get better results without any degradation in speed. Finally, we propose a new coarse-grained GA architecture, the Injection Island GA (iiGA). The preliminary results of iiGA's show them to be a promising new approach to coarse-grain GA's.< >

关键词： Genetic algorithms Convergence Genetic mutations Adaptive systems Circuit testing Application software Computer science Topology Optimization methods Image recognition

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Asymptotic refinements in Bayesian distributed detection

Asymptotic refinements in Bayesian distributed detection

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proceedings of the 1993 IEEE international symposium on Information Theory

作者： Papamarcou, Adrian Chen, Po-Ning Univ of Maryland College Park United States

ISBN: (纸本)0780308786

The performance of a parallel distributed detection system is investigated as the number of sensors tends to infinity. It is assumed that the i.i.d. sensor data are quantized locally into m-ary messages and transmitted to the fusion center for Bayesian binary hypothesis testing. Large deviations techniques are employed to show that the equivalence of absolutely optimal and best identical-quantizer systems is not limited to error exponents, but extends to the actual Bayes error probabilities up to a multiplicative constant. This is true as long as the two hypotheses are mutually absolutely continuous;no further assumptions, such as boundedness of second moments of the post-quantization log-likelihood ratio, are needed.

关键词： Signal detection

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Analytical performance evaluation of data replication based shared memory model 2

Analytical performance evaluation of data replication based ...

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2nd international symposium on High Performance distributed Computing, HPDC 1993

作者： Srbljic, S. Budin, L. Fac. of Electr. Eng. Zagreb Univ. Avenija Vukovar 39 Zagreb41000 Croatia

ISBN: (纸本)0818639008

The proposed distributed shared memory model is based on a data replication scheme that provides an environment for a collection of processes that interact to solve a parallel programming problem. In the implementation of the scheme the authors suppose that the replicas of the shared data are present at each node and that an appropriate coherence protocol for maintaining the consistency among the replicas is applied. The performance of the distributed computation is very sensitive to the data-access behavior of the application and to the applied coherence protocol. Communication cost is regarded as an appropriate performance measure. Therefore, the authors first introduce a model characterizing the computation behavior with five workload parameters. second, they formally describe the coherence protocols as cooperating state machines in order to evaluate their communication costs as functions of workload parameters. © 1993 IEEE.

关键词： parallel programming

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Managing query execution for an advanced database programming language

Managing query execution for an advanced database programmin...

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international Conference on parallel and distributed Information systems

作者： D.A. Schneider T. Connors Hewlett Packard Laboratories Palo Alto CA USA

A method for efficiently managing the execution of a query for an advanced database programming language is demonstrated. It is shown that the mechanism gracefully and efficiently manages control flow in both single-processor and multiprocessor environments. A prototype demonstrating the feasibility of this approach is operational on both single-processor and small-scale multiprocessor systems.< >

关键词： Computer languages Spatial databases Relational databases Environmental management Database languages Testing Runtime Switches Milling machines Programming environments

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parallel pointer-based join techniques for object-oriented databases

Parallel pointer-based join techniques for object-oriented d...

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international Conference on parallel and distributed Information systems

作者： D.F. Lieuwen D.J. DeWitt M. Mehta AT and T Bell Laboratories Inc. Murray Hill NY USA Computer Sciences Department University of Wisconsin Madison WI USA

Four parallel pointer-based join algorithms for set-valued attributes are described. Such joins will be common in next-generation object-oriented database systems. It is shown that while algorithms based on hybrid-hash provide good performance, algorithms that require less replication will often produce as good or better performance, especially if each set-valued attribute references a small number of nodes.< >

关键词： Object oriented databases Algorithm design and analysis Database systems Object oriented modeling Costs Performance analysis Spatial databases Iris Data structures

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Oracle parallel RDBMS on massively parallel systems

Oracle parallel RDBMS on massively parallel systems

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international Conference on parallel and distributed Information systems

作者： B. Linder Technical Services. Massively Parallel Systems Division Oracle Corporation

Oracle relational database technology implemented on massively parallel hardware architectures, which allows both OLTP and decision support on the same database image, is discussed. Both queries and transaction processing power scale linearly on massively parallel processor platforms. This technology delivers scalable relational database superservers.< >

关键词： Scalability Computer architecture Central Processing Unit Hardware Explosions Costs Relational databases Memory Data storage systems Power generation economics

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Replicated data in a distributed environment

Replicated data in a distributed environment

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international Conference on parallel and distributed Information systems

作者： M. Colton Sybase Inc.

Replication Server, a forthcoming product that dynamically maintains subsets of data in a distributed environment, providing several transaction models to maintain loose consistency, is contrasted with existing products which provide location-transparent reads and high-consistency coordinated commits. Replication Server makes it possible to build systems that are much more robust in the face of system component failures. By moving transactions rather than data, and by locating data at the point of processing, it maximizes the use of network bandwidth, enabling the deployment of robust, high-performance applications at a lower cost than with traditional approaches.< >

关键词： Subscriptions File servers Robustness Local area networks Network servers Bandwidth Costs distributed databases Transaction databases Concurrent computing

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