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检索条件"任意字段=Proceedings International Symposium on Databases in Parallel and Distributed Systems"

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Data partition: a practical parallel evaluation of datalog programs

Data partition: a practical parallel evaluation of datalog p...

引用

international Conference on parallel and distributed Information systems

作者： Weining Zhang Ke Wang Siu-Cheung Chau Department of Mathematics and Computer Science University of Lethbridge Lethbridge AB Canada

ISBN: (纸本)0818622954

The authors analyse previous parallel evaluation strategies based on the partition of rule instantiations. They present a parallel evaluation strategy for general Datalog programs that is based on the partition of data and is more practical. A key issue is to determine a criterion of data transmission that reduces the amount of data transmitted and is tested efficiently. A notion of potential usefulness is given as such a criterion. The problem of designing appropriate partition schemes and processing schemes is addressed. Heuristics and algorithms are proposed for making decisions in the design process.< >

关键词： Testing Data communication Query processing Deductive databases Partitioning algorithms Mathematics Computer science Electronic mail parallel processing Logic

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Process migration in the GALAXY distributed operating system

Process migration in the GALAXY distributed operating system

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international symposium on parallel Processing

作者： P.K. Sinha Kyu Sung Park Xiaohua Jia K. Shimizu M. Maekawa Department of Information Science University of Tokyo Bunkyo Tokyo Japan

Transparency, minimal interference, minimal residual dependencies, efficiency and robustness are some of the features that are felt necessary for process migration mechanisms in distributed operating systems. None of the process migration mechanisms proposed so far possess all these features. In the paper the authors describe a process migration mechanism that possesses all the features mentioned above. This process migration mechanism has been developed as a part of the GALAXY distributed operating system.< >

关键词： Operating systems Interference Sprites (computer) Information science Robustness Availability Utility programs Network topology

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On the performance issues of object-based buffering

On the performance issues of object-based buffering

引用

international Conference on parallel and distributed Information systems

作者： J.R. Cheng A.R. Hurson Department of Electrical and Computer Engineering Pennsylvania State University University Park PA USA

Due to the nature of supported applications, object-oriented DBMSs need efficient mechanisms for the retrieval of complex objects and the navigation along semantic links among objects. Object clustering is effective when the primary access pattern follows the primary relationship used for clustering, but not so effective when multiple relationships are involved. Object buffering provides a possible solution to compensate the limitation of clustering schemes. The paper investigates the advantages of using an additional layer of object-based buffer pools on top of a traditional page-based buffer pool, and proposes a profile-based buffering scheme to optimize the efficiency of object buffer pools. The performance evaluation based on the semantic implementation of profiles was conducted.< >

关键词： Object oriented databases Navigation Relational databases Application software Delay Prefetching Prototypes Iris Encapsulation Object oriented modeling

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Optimization of distributed communication in multiprotocol Tuple Space

Optimization of distributed communication in multiprotocol T...

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international symposium on parallel and distributed Processing (IPDPS)

作者： S. Chiba K. Kato T. Masuda Department of Information Science University of Tokyo Japan

Tuple Space provides primitives convenient for description of data-sharing and interprocess communication, but its implementation on distributed systems is less efficient than that on shared memory machines. Multiprotocol Tuple Space improves the implementation on distributed systems. That provides three replication-consistency protocols that are weakened to different degrees. By selecting these protocols according to communication patterns, communication through Tuple Space can be optimized.< >

关键词： History Protocols File servers Information science Software maintenance Broadcasting Hardware Electronic mail Prototypes Workstations

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ReSC: a distributed operating system for parallel and distributed applications

ReSC: a distributed operating system for parallel and distri...

引用

international Conference on parallel and distributed Information systems

作者： Y. Shinjo Y. Kiyoki Institute of Information Sciences and Electronics University of Tsukuba Tsukuba Ibaraki Japan

Summary form only. ReSC is a distributed operating system for both parallel/distributed applications and sequential applications. The hardware environment of ReSC is a set of shared-memory multiprocessors and uniprocessors which are connected to a high-speed local area network. To execute parallel/distributed application programs efficiently, those programs should control scheduling and mapping of their processes by themselves. ReSC provides facilities that enable each application program to control scheduling and mapping. The authors refer to the module which controls mapping as a distribution optimizer. In ReSC, each parallel/distributed application program can include its own lightweight process scheduler and distribution optimiser for optimal mapping and scheduling. ReSC supports for them by kernel calls and libraries. They have developed a lightweight process library on Sequent Balance 8000 and Omron Luna88k (which are shared-memory multiprocessors), Sun4, Sun3 and NeXT. By using the library, they have built a parallel processing system for databases.< >

关键词： Operating systems Libraries Processor scheduling Protection parallel processing Kernel Hardware Local area networks Optimal control Control systems

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Performance evaluation of an efficient multiple copy update algorithm

Performance evaluation of an efficient multiple copy update ...

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international symposium on parallel and distributed Processing (IPDPS)

作者： T.V. Lakshman D. Ghosal Bell Communications Research Inc. Red Bank NJ USA

The authors study the response-time behavior of a symmetric distributed update-synchronization algorithm where nodes need to obtain permission from only O( square root N) (N being the number of database copies) other nodes before performing an update (as opposed to N/2+1 nodes in the well-known Thomas majority consensus algorithm). The algorithm used is an adaptation of M. Maekawa's O( square root N) distributed mutual exclusion algorithm (1985) to multiple-copy update-synchronization. This increase in the efficiency of the update-synchronization algorithm enhances performance in two ways. First, the reduction in transaction service time reduces the response time. Second, the decrease in response time reduces the number of waiting transactions in the system. This reduces the probability of conflict between transactions. To capture the interaction between the probability of conflict and the transaction response time, the authors define a new measure called the conflict response-time product. They show that optimizing this measure yields a different and more appropriate choice of system parameters than simply minimizing the mean transaction response time.< >

关键词： Delay Voting Permission distributed databases Time measurement Springs Time factors Availability Transaction databases Identity-based encryption

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Designing highly parallel applications using database programming concepts

Designing highly parallel applications using database progra...

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international Conference on parallel and distributed Information systems

作者： M.R. van Steen E. de Jong TNO Institute of Applied Computer Science Delft Netherlands Department of Computer Science University of Leiden Leiden Netherlands

The paper presents the specification language Vista, which incorporates a new parallel programming model strongly influenced by concepts originating in the field of object oriented database programming. Before introducing Vista, it first gives a brief overview of the problems related to existing parallel programming models, and shows that support for a higher level of abstraction is necessary. Following the presentation of Vista, the paper presents a comparison to related research, including a discussion on the Linda parallel programming model that has also successfully incorporated concepts from the field of database programming. Some indications of future research conclude the paper.< >

关键词： databases parallel programming Computer science Application software Content addressable storage Concurrent computing parallel processing Message passing Operating systems Assembly

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Distorted mirrors

Distorted mirrors

引用

international Conference on parallel and distributed Information systems

作者： J.A. Solworth C.U. Orji University of Illinois Chicago Chicago IL USA

The authors introduce distorted mirrors, a mirroring system which combines write anywhere semantics with traditional database-specified block locations. This technique radically reduces the cost of small writes; making it attractive for random access applications such as OLTP, while retaining the ability to efficiently perform large sequential accesses. Distorted mirror also scale better than traditional mirrors in terms of both disk caching and large mirrored sets. The effectiveness of distorted mirrors is shown on the TP1 benchmark.< >

关键词： Mirrors Costs Throughput databases Shadow mapping Availability Arm Delay Time measurement

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Optical database machine using spatial light rebroadcasters

Optical database machine using spatial light rebroadcasters

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international symposium on parallel Processing

作者： Soon Myoung Chung Computer Science and Engineering Wright State University Dayton OH USA

An optical database machine using spatial light rebroadcasters (SLRs) is proposed to speed up relational operations on large databases. A SLR is a nonvolatile memory device with large storage capacity and high read/write speed. Since most of the database operations can be performed directly on the SLRs, one doesn't have the I/O bottleneck, which is a major problem in other database machine architecture. One can search data stored in the SLR in parallel by a single search operation. parallel relational operation algorithms are developed for the proposed architecture, and the author evaluates the performance of the machine for various cases. Compared to the other database machines, performance of the proposed architecture is at least a order of magnitude faster due to the parallel processing capability and high read/write speed of the SLR.< >

关键词： Database machines Optical devices Spatial databases parallel processing Electron traps Relational databases Computer science Data engineering Database systems Hardware

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Caching and writeback policies in parallel file systems

Caching and writeback policies in parallel file systems

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international symposium on parallel and distributed Processing (IPDPS)

作者： D. Kotz C.S. Ellis Department of Math and Computer Science Dartmouth College Hanover NH USA Duke University Durham NC USA

Improvements in the processing speed of multiprocessors are outpacing improvements in the speed of disk hardware. parallel disk I/O subsystems have been proposed as one way to close the gap between processor and disk speeds. Such parallel disk systems require parallel file system software to avoid performance-limiting bottlenecks. The authors discuss cache management techniques that can be used in a parallel file system implementation. The authors examine several writeback policies, and give results of experiments that test their performance.< >

关键词： File systems Hardware Prefetching Computer science Testing Bandwidth parallel processing Application software Educational institutions Power system management

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