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

共 513 条记录，以下是341-350 订阅

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Network-specific performance enhancements for PVM

Network-specific performance enhancements for PVM

引用

proceedings of the 4th IEEE international symposium on High Performance distributed Computing

作者： Davies, Gregory Matloff, Norman Tandem Computers Cupertino United States

PVM, a message-passing software system for parallel processing, is used on a wide variety of processor platforms, but this portability restricts execution speed. The work here will address this problem mainly in the context of Ethernet-based systems, proposing two PVM enhancements for such systems. The first enhancement exploits the fact that an Ethernet has broadcast capability. Since unenhanced PVM must, to keep portability, avoid using broadcast, execution speed is sacrificed. In addition, the larger the system, the larger the sacrifice in speed. A solution to this problem is presented. The second enhancement is intended for use in applications in which many concurrent tasks finish at the same time, and thus simultaneously try to transmit to a master process. On an Ethernet, this produces excessively long random backoffs, reducing program speed. An enhancement, termed 'programmed backoff,' is proposed.

关键词： parallel processing systems

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RACE network architecture

RACE network architecture

引用

proceedings of the IEEE 9th international parallel Processing symposium

作者： Kuszmaul, Bradley C. Mercury Computer Systems Inc Chelmsford United States

The RACE(R) parallel computer system provides a high-performance parallel interconnection network at low cost. This paper describes the architecture and implementation of the RACE system, a parallel computer for embedded applications. The topology of the network, which is constructed with 6-port switches, can be specified by the customer, and is typically a fat-tree, a Clos network, or a mesh. The network employs a preemptable circuit switched strategy. The network and the processor-network interface work together to provide high performance: 160 megabytes per second transfer rates with about 1 microsecond of latency. Priorities can be used to guarantee tight real-time constraints of a few microseconds through a congested network. A self-regulating circuit adjusts the impedence and output delay of the pin-driver pads.

关键词： parallel processing systems

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Methods and tools for the efficient use of parallel computer architectures 1

Methods and tools for the efficient use of parallel computer...

引用

1st Aizu international symposium on parallel Algorithms/Architecture Synthesis, AISPAS 1995

作者： Bode, Arndt Institut für Informatik Lehrstuhl für Rechnertechnik und Rechnerorganisation Technische Universitat Munchen MunchenD-80290 Germany

ISBN: (纸本)081867038X

This article covers research at Technische Universität München on distributed and parallel architectures and applications. First, an overview on the parallel processing research organization is given. The second main topic covers an integrated hierarchical programming environment TOPSYS for parallel and distributed systems developed as part of the research grant. © 1995 IEEE.

关键词： Hierarchical systems

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Bicriterion scheduling of identical processing time jobs by uniform processors

Bicriterion scheduling of identical processing time jobs by ...

引用

proceedings of the IEEE 9th international parallel Processing symposium

作者： Tuzikov, A. Makhaniok, M. Manner, R. Acad of Sciences of Belarus Minsk Belarus

The problem of bicriterion scheduling of jobs with identical processing times by uniform processors is considered. The first criterion is the minimization of either total or maximum costs, the second one is the minimization of maximum cost with different cost functions. Polynomial time algorithms are presented to determine all efficient solutions and the optimal solution for a given global criterion.

关键词： parallel processing systems

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Non-blocking concurrency control in distributed database systems

Non-blocking concurrency control in distributed database sys...

引用

Aizu international symposium on parallel Algorithms/Architecture Synthesis

作者： P. Krishna Reddy S. Bhalla Division of Computer Engineering Delhi Institute of Technology New Delhi India

Concurrency control based on conventional techniques requires additional efforts for deadlock detection and elimination. The possibility of a deadlock is also connected to the introduction of delays, and repeated restarts of transactions in deadlock cycles. In the proposed approach, a technique for generation of data flow precedence graphs among transactions at data sites has been studied. The local access graph approach is a fully distributed approach. Through local computations, the approach can prevent deadlocks in a distributed system.< >

关键词： Concurrency control Database systems System recovery Transaction databases distributed databases Flow graphs Detection algorithms distributed computing Delay systems Degradation

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Dynamic processor sharing in torus multicomputers

Dynamic processor sharing in torus multicomputers

引用

international symposium on parallel and distributed Processing (IPDPS)

作者： Yi-Long Chen Ying Zhang Jyh-Charn Liu Bell-Northern Research Inc. Richardson TX USA Department of Computer Science Texas A and M University College Station TX USA

ISBN: (纸本)0818671955

This paper proposes a distributed dynamic processor sharing scheme in torus-connected multicomputer systems. It is applicable to database query and on-line transaction processing applications. In such a system, each processor can process small transaction tasks locally and support parallel execution of large transaction tasks in a timesharing fashion. distributed management of processors is achieved by our scheme based on the distributed submesh table (DST) which describes how processors are clustered and how many time-slices that each cluster can provide.

关键词： Transaction databases Multimedia systems Multimedia databases Network servers Computer science Concurrent computing Data structures

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Data parallel logic programming in &ACE

Data parallel logic programming in &ACE

引用

international symposium on parallel and distributed Processing (IPDPS)

作者： E. Pontelli G. Gupta Laboratory for Logic Databases and Advanced Programming New Mexico State University USA

&ACE is a high performance parallel Prolog system developed at the Laboratory for Logic, databases, and Advanced Programming that exploits and-parallelism from Prolog programs. &ACE was developed to exploit MIMD parallelism. However, SPMD parallelism also arises naturally in many Prolog programs. In this paper we develop runtime techniques that allow systems that have primarily been designed to exploit MIMD parallelism (such as &ACE) to also efficiently exploit SPMD parallelism. These runtime techniques have been incorporated in the &ACE system. Performance of &ACE augmented with these techniques on programs containing SPMD parallelism is presented.

关键词： Logic programming Runtime parallel processing Program processors Programming profession Artificial intelligence Laboratories databases parallel programming Sun

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The performance of replica control protocols in the presence of site failures

The performance of replica control protocols in the presence...

引用

international symposium on parallel and distributed Processing (IPDPS)

作者： M.L. Liu D. Agrawal A. El Abbadi Department of Computer Science Cal Poly State University San Louis Obispo CA USA Department of Computer Science University of California Santa Barbara CA USA

Although managing multiple copies of a database has been the subject of intensive research for quite some time now, it has yet to fulfill its promise in practical applications. In the current state of distributed database technology, data replication, if implemented at all, is typically enforced by the read-one-write-all protocol. More complicated but less restrictive replica control protocols, though a popular topic in research, are not implemented in any widely-used systems. A major reason for this lack of acceptance is that the performance impact of these protocols cannot be easily quantified, since very little existing performance figures of replicated commercial database systems are available. This paper investigates the overhead of data replication, and compares the performance of a seldom implemented protocol, quorum consensus, with the performance of a widely accepted protocol, primary copy.

关键词： Protocols Computer science distributed databases Control systems Delay Application software Database systems Availability Throughput Transaction databases

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Methods and tools for the efficient use of parallel computer architectures

Methods and tools for the efficient use of parallel computer...

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Aizu international symposium on parallel Algorithms/Architecture Synthesis

作者： A. Bode Institut für Informatik Lehrstuhl für Rechnertechnik und Rechnerorganisation Technische Universität München Munchen Germany

This article covers research at Technische Universitat Munchen on distributed and parallel architectures and applications. First, an overview on the parallel processing research organization is given. The second main topic covers an integrated hierarchical programming environment TOPSYS for parallel and distributed systems developed as part of the research grant.< >

关键词： Concurrent computing Computer architecture Algorithm design and analysis Performance analysis Programming environments parallel algorithms Job shop scheduling Processor scheduling parallel processing Textile industry

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The synchronizing of loosely coupled distributed real time system

The synchronizing of loosely coupled distributed real time s...

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international symposium on Autonomous Decentralized systems (ISADAS)

作者： P. Tuominen T. Virvalo Institute of Hydraulics It Automation Tampere University of Technology Tampere Finland

In this paper the control architecture and the characteristics of the synchronization of an industrial application are presented. The control procedure is implemented with a loosely coupled distributed real time system, where parallel processing is possible. There are five nodes in the network, one master actuator, three slave actuators and a machine controller. All nodes are implemented using Motorola's 68332 controller. The position and velocity of the master are transmitted as a command to slaves. The network protocol used is CAN (controlled area network). On-line correction and synchronization are done through a serial based network. In this paper synchronization methods, characteristics of CAN, control architecture electronics used are introduced.< >

关键词： Real time systems Master-slave Actuators Electrical equipment industry Industrial control Control systems Couplings parallel processing Protocols

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