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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211-220 订阅

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A multithreaded concurrent garbage collector parallelizing the new instruction in Java

A multithreaded concurrent garbage collector parallelizing t...

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international symposium on parallel and distributed Processing (IPDPS)

作者： C.-T.D. Lo W. Srisa-an J.M. Chang Department of Computer Science Illinois Institute of Technology Chicago IL USA

parallel, multithreaded Java applications such as Web servers, database servers, and scientific applications are becoming increasingly prevalent. Most of them have high object instantiation rates through the new bytecode that is implemented in a garbage collection subsystem typically. For aforementioned applications, traditional garbage collectors are often the bottleneck that limits program performance and processor utilization on multiprocessor systems. They suffer from long garbage collection pauses (stop-the-world mark-sweep algorithm) or inability of collecting cyclic garbage (reference counting approach). Generational garbage collection, however, is based only on the weak generational hypothesis that most objects die young. In this paper, a new multithreaded concurrent generational garbage collector (MCGC) based on mark-sweep with the assistance of reference counting is proposed. The MCGC can take advantage of multiple CPUs in an SMP system and the merits or light weight processes. Furthermore, the long garbage collection pause can be reduced and the garbage collection efficiency can be enhanced.

关键词： Java parallel programming Virtual machining Yarn Web server databases Multiprocessing systems Memory management Batteries Counting circuits

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Comparing the memory system performance of DSS workloads on the HP V-Class and SGI Origin 2000

Comparing the memory system performance of DSS workloads on ...

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international symposium on parallel and distributed Processing (IPDPS)

作者： Rong Yu Laxmi Bhuyan R. Iyer Personity Inc. Pittsburgh PA USA Dept of Computer Science University of California Riverside CA USA Enterprise Architecture Lab INTEL Research Laboratory Hillsboro OR USA

In this paper, we present an in-depth analysis of the memory system performance of the DSS commercial workloads on two state-of-the-art multiprocessors: the SGI Origin 2000 and the HP V-Class. Our results show that a single query process takes almost the same amount of cycles in both machines. However; when multiple query processes run simultaneously on the system, the execution time tends to increase more in SGI Origin 2000 than in HP V-Class due to the more expensive communication overhead in SGI Origin 2000. We also show how the rate at which the number of data cache misses, context switches and the overall execution time increases when more query processes run simultaneously.

关键词： System performance Decision support systems Query processing Computer science Computer architecture Performance analysis Context Switches Communication switching databases

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A performance evaluation of a temporally correct and optimistic concurrency control protocol

A performance evaluation of a temporally correct and optimis...

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international symposium on Modeling, Analysis and Simulation of Computer and Telecommunication systems (MASCOTS)

作者： A. Boukerche T.W. Tuck Sungbum Hong Department of Computer Science University of North Texas USA

In this paper we focus on the temporary return of data values that are incorrect for given transactional semantics and could have catastrophic effects similar to those in parallel and discrete event simulation. In many applications using on-line transaction processing (OLTP) environments, for instance, it is best to delay the response to a transaction's read request until it is either known or unlikely that a write message from an older update transaction will not make the response incorrect. Examples of such applications are those where aberrant behavior is too costly, and those in which precommitted data are visible to some reactive entity. In light of the avoidance of risk in this approach, we propose a risk-free multiversion temporally correct (RFMVTC) concurrency control algorithm. We discuss the algorithm, its implementation and report on the performance results of simulation models using a cluster of workstations.

关键词： Concurrency control Protocols Transaction databases distributed databases Relational databases Application software Clustering algorithms Database systems Computer science Discrete event simulation

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Leveraging run time knowledge about event rates to improve memory utilization in wide area data stream filtering

Leveraging run time knowledge about event rates to improve m...

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international symposium on High Performance distributed Computing

作者： B. Plale Computer Science Department Indiana University Bloomington IN USA

The dQUOB system conceptualization of data streams as database and its SQL interface to data streams is an intuitive way for users to think about their data needs in a large scale application containing hundreds if not thousands of data streams. Experience with dQUOB has shown the need for more aggressive memory management to achieve the scalability we desire. This paper addresses the problem with a two-fold solution. The first one is replacement of the existing first-come first-served scheduling algorithm with an earliest job first algorithm which we demonstrate to yield better average service time. The second one is an introspection algorithm that sets and adapts the sizes of join windows in response to the knowledge acquired at runtime about event rates. In addition to the potential for significant improvements in memory utilization, the algorithm presented here also provides a means by which the user can reason about join window sizes. Wide area measurements demonstrate the adaptive capability required by the introspection technique.

关键词： Scalability Scheduling algorithm Relational databases Filtering Computer science Large-scale systems Application software Memory management Runtime Wide area measurements

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Shaman: a distributed simulator for shared memory multiprocessors

Shaman: a distributed simulator for shared memory multiproce...

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international symposium on Modeling, Analysis and Simulation of Computer and Telecommunication systems (MASCOTS)

作者： H. Matsuo S. Imafuku K. Ohno H. Nakashima Toyohashi University of Technology Fujitsu Prime Software Technologies Limited Japan Toyohashi University of Technology Seiko Epson Corporation Japan Toyohashi University of Technology Japan

The paper describes Shaman, our distributed architectural simulator of shared memory multiprocessors (SMP). The simulator runs on a PC cluster that consists of multiple front-end nodes to simulate the instruction level behavior of a target multiprocessor in parallel and a back-end node to simulate the target memory system. The front-end also simulates the logical behavior of the shared memory using a software DSM (distributed shared memory) technique and generates memory references to drive the back-end. A remarkable feature of our simulator is reference filtering to reduce the amount of the references transferred from the front-end to the back-end utilizing the DSM mechanism and coherent cache simulation on the front-end. This technique and our sophisticated DSM implementation give an extraordinary performance to the Shaman simulator. We achieved 335 million and 392 million simulation clock per second for LU decomposition and FFT in SPLASH-2 kernel benchmarks respectively, when we used 16 front-end nodes to simulate a 16-way target SMP.

关键词： Discrete event simulation Filtering Computational modeling Clocks Kernel Multiprocessing systems Radio access networks Frequency Delay Out of order

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R-tree-based data migration and self-tuning strategies in shared-nothing spatial databases 01

R-tree-based data migration and self-tuning strategies in sh...

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ACM-GIS 2001: proceedings of the Ninth ACM international symposium on: Advances in Geographic Information systems

作者： Mondal, Anirban Kitsuregawa, Masaru Ooi, Beng Chin Tan, Kian Lee Department of Computer Science National University of Singapore Singapore Singapore

ISBN: (纸本)9781581134438

In order to provide fast and timely answers to queries in the context of spatial databases and GIS, we present our solution for effective data migration and tuning strategies in shared-nothing parallel spatial databases. Our purpose is to improve the performance of the indexes. Our approach has the following features. First, our scheme is self-tuning, dynamic as well as query-centric and it can adapt to dynamically changing user access patterns. second, a global distributed R-tree-based indexing method is employed to facilitate effective data migration. Third, unlike traditional partitioning strategies where each processing element (PE) contains data from a single region of space, we allow each PE to store data from multiple and disjoint regions. This minimizes overlap in regions as well as coverage. We implemented the proposed scheme and conducted an extensive performance study on Fujitsu's AP3000 machine with 32 workstations using real datasets. Our experimental results show that our load-balancing strategy can distribute the load effectively across the PEs in the system, thereby reducing response times of incoming queries.

关键词： Geographic information systems

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An implementation of parallel dynamic load balancing for adaptive computing in VLSI device simulation 15

An implementation of parallel dynamic load balancing for ada...

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15th international parallel and distributed Processing symposium, IPDPS 2001

作者： Li, Yiming Chen, Cheng-Kai Lin, Shui-Sheng Chao, Tien-Sheng Lin, Jinn-Liang Sze, S.M. Department of Electronics Engineering Institute of Electronics National Chiao Tung University Hsinchu Taiwan Department of Computer and Information Science National Chiao Tung University Hsinchu Taiwan Department of Applied Mathematics National Chiao Tung University Hsinchu Taiwan National Nano Device Laboratories National Chiao Tung University Hsinchu Taiwan

ISBN: (纸本)0769509908

A new parallel semiconductor device simulation using the dynamic load balancing approach is presented. This semiconductor device simulation based on adaptive finite volume error estimation, and monotone iterative methods has been developed and implemented on a Linux-cluster with MPI library. Two different parallel versions of the algorithm to perform a complete device simulation are proposed. The first one is a dynamic parallel domain decomposition approach. The second version is a parallel current-voltage characteristic points simulation. The implementation shows that a well-designed load balancing simulation can reduce the execution time up to an order of magnitude. Compared with the measured data, numerical simulations on P-N diode, N-MOSFET, and DTMOS devices are presented to show the accuracy and efficiency of the method. © 2001 IEEE.

关键词： Computer operating systems

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Predictability for real-time command and control

Predictability for real-time command and control

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international symposium on parallel and distributed Processing (IPDPS)

作者： W.C. Meilander J.W. Baker J. Potter Kent University USA

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Scheduling value-based transactions in distributed real-time database systems

Scheduling value-based transactions in distributed real-time...

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international symposium on parallel and distributed Processing (IPDPS)

作者： Hong-Ren Chen Y.H. Chin Shin-Mu Tseng Department of Computer Science National Tsing Hua University Hsinchu Taiwan Department of Computer Science and Information Engineering National Cheng Kung University Tainan Taiwan

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A scientific data management system for irregular applications

A scientific data management system for irregular applicatio...

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international symposium on parallel and distributed Processing (IPDPS)

作者： Jaechun No R. Thakur D. Kaushik L. Freitag A. Choudhary Math. and Computer Science Division Argonne National Laboratory Argonne IL USA Department of Elec. and Computer Eng Northwestern University Evanston IL USA

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