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

共 9676 条记录，以下是141-150 订阅

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Opass: Analysis and Optimization of parallel Data Access on distributed File systems 29

Opass: Analysis and Optimization of Parallel Data Access on ...

引用

29th IEEE international parallel and distributed Processing symposium (IPDPS)

作者： Yin, Jiangling Wang, Jun Zhou, Jian Lukasiewicz, Tyler Huang, Dan Zhang, Junyao Univ Cent Florida Dept Elect Engn & Comp Sci Orlando FL 32816 USA

ISBN: (纸本)9781479986484

In this paper, we study parallel data access on distributed file systems, e.g, the Hadoop file system. Our experiments show that parallel data read requests are often served data remotely and in an imbalanced fashion. This results in a serious disk access and data transfer contention on certain cluster/storage nodes. We conduct a complete analysis on how remote and imbalanced read patterns occur and how they are affected by the size of the cluster. We then propose a novel method to Optimize parallel Data Access on distributed File systems referred to as Opass. The goal of Opass is to reduce remote parallel data accesses and achieve a higher balance of data read requests between cluster nodes. To achieve this goal, we represent the data read requests that are issued by parallel applications to cluster nodes as a graph data structure where edges weights encode the demands of data locality and load capacity. Then we propose new matching-based algorithms to match processes to data based on the configurations of the graph data structure so as to compute the maximum degree of data locality and balanced access. Our proposed method can benefit parallel data-intensive analysis with various parallel data access strategies. Experiments are conducted on PRObEs Marmot 128-node cluster testbed and the results from both benchmark and well-known parallel applications show the performance benefits and scalability of Opass.

关键词： parallel Data Access distributed File systems Bipartite Matching

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parallel Initialization on distributed Simulation systems 14

Parallel Initialization on Distributed Simulation Systems

引用

18th IEEE/ACM international symposium on distributed Simulation and Real Time Applications (DS-RT)

作者： Menezes, Nilo Ney Coutinho Multitel ASBL Discrete Complex Syst Simulat Optimisat & Decis M B-7000 Mons Belgium

ISBN: (纸本)9781479961436

The initialization of distributed heterogeneous simulation systems presents challenges regarding the parallelization of object construction and setup. This paper presents a method for parallel initialization of distributed simulation systems that consists of a two phases setup. Object instantiation and setup are split in Config and Post Bind phases to permit fast creation times allowing distribution of initialization tasks among different nodes and removing the ordering requirement between the initialization of interdependent objects. A framework of references is presented to facilitate the use of remote objects in a MPI environment using proxies to access local and remote variables, served by a reference name server built into the simulation engine.

关键词： distributed simulation parallel initialization distributed configuration

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CORRECTING EXECUTION OF distributed QUERIES 90

引用

2ND international SYMP ON databases IN parallel AND distributed systems ( DPDS 90 )

作者： BODORIK, P PYRA, J RIORDON, JS School of Computer Science Technical University of Nova Scotia P.O. Box 1000 Halifax Nova Scotia B3J 2X4 Canada Dept. of Systems and Computer Engineering Carleton University Ottawa Ontario K1S 5B6 Canada

ISBN: (纸本)0818620528

Algorithms for processing distributed queries require a priori estimates of the size of intermediate relations. Most such algorithms take a “static” approach in which the algorithm is completely determined before processing begins. If size estimates are found to be inaccurate at some intermediate stage, there is no opportunity to re-schedule, and the result may be far from optimal. Adaptive query execution may be used to alleviate the problem. Care is necessary, though, to ensure that the delay associated with re-scheduling does not exceed the time saved through the use of a more efficient strategy. This paper presents a low overhead delay method to decide when to correct a strategy. Sampling is used to estimate the size of relations, and alternative heuristic strategies prepared in a background mode are used to decide when to correct. Correction is made only if lower overall delay is achieved, including correction time. Evaluation using a model of a distributed data base indicates that the heuristic strategies are near optimal. Moreover, it also suggests that it is usually correct to abort creation of an intermediate relation which is much larger than predicted.

关键词： Database systems

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T3C: A temporally correct concurrency control algorithm for distributed databases 8

T3C: A temporally correct concurrency control algorithm for ...

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8th international symposium on Modeling, Analysis and Simulation of Computer and Telecommunication systems

作者： Boukerche, A Tuck, TW Univ N Texas Parallel Simulat & Distributed Syst PARADISE Res Dept Comp Sci Denton TX 76203 USA

ISBN: (纸本)076950728X

In some scenarios involving on-line transaction processing within a distributed database, it is desirable to synchronize transactions in a manner that guarantees conflict equivalence with a serial schedule ordered by original transaction start times while providing each transaction with an anomaly serializable isolation. Few theoretical concurrency control algorithms guarantee such a conflict equivalence, and we are unaware of any protocol that accomplishes this while supporting real-world issues such as out-of-order transaction messages, out-of-order operation executions, and out-of-order transaction committals without the burden of explicit readset and writeset declarations We describe an algorithm that provides this guarantee mid supports these issues while requiring only table-level writeset declarations.

关键词： Concurrency control

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MPI ruby with remote memory access

MPI ruby with remote memory access

引用

13th IEEE international symposium on High Performance distributed Computing (HPDC-13)

作者： Aycock, CC Univ Oxford Comp Lab Oxford OX1 3QD England

Advances in communication for parallel programming have yielded one-sided messaging systems. The MPI bindings for Ruby have been augmented to include the remote memory access functions of MPI-2.

ISBN: (纸本)0780321754

Advances in communication for parallel programming have yielded one-sided messaging systems. The MPI bindings for Ruby have been augmented to include the remote memory access functions of MPI-2.

关键词： parallel processing systems

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parallel Simulation of Multi-Agent systems using Terracotta 10

Parallel Simulation of Multi-Agent Systems using Terracotta

引用

14th IEEE/ACM international symposium on distributed Simulation and Real-Time Applications (DS-RT 2010)

作者： Cicirelli, Franco Furfaro, Angelo Giordano, Andrea Nigro, Libero Univ Calabria Lab Ingn Software Dipartimento Elettron Informat & Sistemist I-87036 Arcavacata Di Rende CS Italy

ISBN: (纸本)9780769542515

This paper describes a novel approach to parallel simulation of complex multi-agent systems which is based on actors and the Java middleware Terracotta. The approach aims to an exploitation of the computing power of modern multi-core machines. Terracotta was chosen because it transparently allows to cluster the JVM. The paper discusses design and implementation aspects of the approach, and demonstrates the achievable execution performance through the parallel simulation of a scalable multi-agent system based on the predator/prey model.

关键词： Actors modeling and parallel simulation multi-core architectures complex multi-agent systems Terracotta Java

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A Hierarchical Architecture Description for Flexible Multicore System Simulation 12

A Hierarchical Architecture Description for Flexible Multico...

引用

12th IEEE international symposium on parallel and distributed Processing with Applications (ISPA)

作者： Bruckschloegl, Thomas Oey, Oliver Rueckauer, Michael Stripf, Timo Becker, Juergen Karlsruhe Inst Technol Inst Informat Proc Technol ITIV D-76021 Karlsruhe Germany

ISBN: (纸本)9781479942930

As processors and systems on chip in the embedded world increasingly become multicore, parallel programming remains a difficult, time-consuming and complicated task. End users who are not parallel programming experts have a need to exploit such processors and architectures, using high level programming languages, like Scilab or MATLAB. The ALMA toolset solves this problem: it takes Scilab code as input and produces parallel code for embedded multiprocessor systems on chip, using platform quasi-agnostic optimizations. The platform information is provided by an architecture description language designed for the purpose of a flexible system description as well as simulation. A hierarchical system description in combination with a parameterizable simulation environment allows fine-grained trade-offs between simulation performance and simulation accuracy.

关键词： Accuracy Multicoreprocessing Optimization parallelprocessing Programprocessors System-on-chip system-on-chip Architecture description languages PROCESSOR multiprocessor system on chip ARCHITECTURE Multi-core processors systems simulation parallel programming Simulated Environment Building construction FLEXIBLE

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Aurora: Scoped behaviour for per-context optimized distributed data sharing

Aurora: Scoped behaviour for per-context optimized distribut...

引用

11th international parallel Processing symposium (IPPS 97)

作者： Lu, P Univ of Toronto Toronto Canada

ISBN: (纸本)0818677937

We introduce the all-software, standard C++-based Aurora distributed shared data system. As with related systems, it provides a shared data abstraction on distributed memory hardware. An innovation in Aurora is the use of scoped behaviour for per-context data sharing optimizations (i.e., portion of source code, such as a loop or phase). With scoped behaviour a new language scope (e.g., nested braces) can be used to optimize the data sharing behaviour of the selected source code. Different scopes and different shared data can be optimized in different ways. Thus, scoped behaviour provides a novel level of flexibility to incrementally tune the parallel performance of an application.

关键词： distributed computer systems

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parallel Classification of Spatial Points Into Geographical Regions 18

Parallel Classification of Spatial Points Into Geographical ...

引用

18th international symposium on parallel and distributed Computing (ISPDC)

作者： Tarmur, Sanver Ozturan, Can Bogazici Univ Computat Sci & Engn Program Istanbul Turkey Bogazici Univ Comp Engn Dept Istanbul Turkey

ISBN: (纸本)9781728138015

The amount of data generated by social media, social networks and distributed platforms such as blockchain, have reached quite high levels. Various data analysis methods could be applied this big data. One of these methods is to classify geo-tagged social network data in order to report geographical area associated with the data. We propose an efficient parallel classification approach and implement a classifier tool which is capable of processing huge amount of data. To test our approach, we collect Twitter data over five densest areas of Turkey. There are important factors affecting the classification performance such as the spatial indexing and the parallelization strategies. Hierarchical Triangular Mesh (HTM) and R-Tree spatial indexes are used for indexing regions. For parallel processing data streams classifier tool is implemented based on Apache Spark and Kafka platforms in order to obtain high scalability. To show effectiveness of our method, we perform tests on Amazon Web Services (AWS) Cloud environment and compare our method against a method which implements HTM on a Microsoft SQL Server. Results show that 1.6 - 4.5 fold speed-up is obtained and Twitter data that is collected over a month can be processed effectively in three hours.

关键词： Indexing Servers Sparks Spatial databases Twitter Spatial indexes

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Implementation and performance of a parallel file system for high performance distributed applications

Implementation and performance of a parallel file system for...

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5th IEEE international symposium on High Performance distributed Computing

作者： Ligon, WB Ross, RB CLEMSON UNIV CLEMSONSC 29631

ISBN: (纸本)0818675829

Dedicated Cluster parallel Computers (DCPCs) are emerging as low-cost high performance environments for many important applications in science and engineering. A significant class of applications that perform well on a DCPC are coarse-grain applications that involve large amounts of file I/O. Current research in parallel file systems for distributed systems is providing a mechanism for adapting these applications to the DCPC environment. We present the parallel Virtual File System (PVFS), a system that provides disk striping across multiple nodes in a distributed parallel computer and file partitioning among tasks in a parallel program. PVFS is unique among similar systems in that it uses a streams-based approach that represents each file access with a single set of request parameters and decouples the number of network messages from details of the files striping and partitioning. PVFS also provides support for efficient collective file accesses and allows overlapping file partitions. We present results of early performance experiments that show PVFS achieves excellent speedups in accessing moderately sized file segments.

关键词： parallel processing systems

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