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Scheduling of a parallel computation-bound application and sequential applications executing concurrently on a cluster – a case study

引用

2nd International symposium on parallel and distributed processing and Applications, ISPA 2004

作者： Wong, Adam K. L. Goscinski, Andrzej M. School of Information Technology Deakin University GeelongVic3216 Australia

ISBN: (纸本)9783540241287

Studies have shown that most of the computers in a non-dedicated cluster are often idle or lightly loaded. The underutilized computers in a non-dedicated cluster can be employed to execute parallel applications. The aim of this study is to learn how concurrent execution of a computation-bound and sequential applications influence their execution performance and cluster utilization. The result of the study has demonstrated that a computation-bound parallel application benefits from load balancing, and at the same time sequential applications suffer only an insignificant slowdown of execution. Overall, the utilization of a non-dedicated cluster is improved. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Computers

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Uml based statistical testing acceleration of distributed safety-critical software

引用

2nd International symposium on parallel and distributed processing and Applications, ISPA 2004

作者： Yan, Jiong Wang, Ji Chen, Huo-Wang National Laboratory for Parallel and Distributed Processing Changsha China

ISBN: (纸本)9783540241287

It is necessary to assess the reliability of distributed safety-critical systems to a high degree of confidence before they are deployed in the field. However, distributed safety-critical software systems often include some rarely executed critical functions that are often inadequately tested in statistical testing based reliability estimation. This paper presents a method that can accelerate statistical testing of distributed safety-critical software. The method starts with the derivation of scenario usage diagram model (SUD) from UML diagrams annotated with usage related attributes and reliability attributes. Then the statistical testing accelerating method based on importance sampling is presented. When both the critical scenarios and the entire software are adequately tested, the method can still compute the unbiased software reliability from the test results with much less test cases. Thus, the statistical testing cost of distributed safety-critical software can be reduced effectively. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Software reliability

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Superpas: A parallel architectural skeleton model supporting extensibility and skeleton composition

引用

2nd International symposium on parallel and distributed processing and Applications, ISPA 2004

作者： Akon, Mohammad Mursalin Goswami, Dhrubajyoti Li, Hon Fung Department of Computer Science Concordia University MontrealQCH3G 1M8 Canada

ISBN: (纸本)9783540241287

Application of pattern-based approaches to parallel programming is an active area of research today. The main objective of pattern-based approaches to parallel programming is to facilitate the reuse of frequently occurring structures for parallelism whereby a user supplies mostly the application specific code-components and the programming environment generates most of the code for parallelization. parallel Architectural Skeleton (PAS) is such a pattern-based parallel programming model and environment. The PAS model provides a generic way of describing the architectural/structural aspects of patterns in message-passing parallel computing. Application development using PAS is hierarchical, similar to conventional parallel programming using MPI, however with the added benefit of reusability and high level patterns. Like most other pattern-based parallel programming models, the benefits of PAS were offset by some of its drawbacks such as difficulty in: (1) extending PAS and (2) skeleton composition. SuperPAS is an extension of PAS that addresses these issues. SuperPAS provides a skeleton description language for the generic PAS. Using SuperPAS, a skeleton developer can extend PAS by adding new skeletons to the repository (i.e., extensibility). SuperPAS also makes the PAS system more flexible by defining composition of skeletons. In this paper, we describe SuperPAS and elaborate its use through examples. © Springer-Verlag Berlin Heidelberg 2004.

关键词： parallel programming

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A real time MPEG-4 parallel encoder on software distributed shared memory systems

引用

2nd International symposium on parallel and distributed processing and Applications, ISPA 2004

作者： Chiu, Yung-Chang Shieh, Ce-Kuen Wang, Jing-Xin Su, Alvin Wen-Yu Liang, Tyng-Yeu Department of Electrical Engineering National Cheng Kung University Tainan Taiwan Department of Computer Science and Information Engineering National Cheng Kung University Tainan Taiwan Department of Electrical Engineering National Kaohsiung University of Applied Sciences Kaohsiung Taiwan

ISBN: (纸本)9783540241287

This paper is dedicated to developing a real-time MEPG-4 parallel encoder on software distributed shared memory systems. Basically, the performance of a MPEG-4 parallel encoder implemented on distributed systems is mainly determined by the latency of data synchronization and disk I/O, and the cost of data computation. For reducing the impact of data synchronization latency, we invent a pipeline algorithm to minimize the number of data synchronization points necessary for video encoding. In addition, we employ a master-slave node structure to overlay computation and I/O in order for alleviating the impact of I/O latency. On the other hand, we propose a two-level partitioning method to minimize the cost of data computation, and overlap the encoding times of two different GOVs. We have implemented the proposed MPEG-4 encoder on a test bed called Teamster. The experimental results show the proposed MPEG-4 encoder has successfully met the requirement of real time through the support of previous techniques via 32 SMP machines, which are equipped with dual 1.5 GHz Itanium II processors per node and connected by Gigabit Ethernet. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Encoding (symbols)

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An optimal scheme of parallel processing for test generation in a distributed system

An optimal scheme of parallel processing for test generation...

引用

Asian Test symposium (ATS)

作者： T. Inoue T. Yonezawa H. Fujiwara Advanced Institute of Science and Technology Nara Japan Matsushita Communication Industrial Company Limited Osaka Japan

This paper presents an approach to parallel processing of test generation for logic circuits in a loosely-coupled distributed network of general purpose computers. We first analyze the relation between the number of processors and the total processing time for a client-server model (CS model). The result of the analysis shows that for the CS model there exists an optimal number of processors which minimizes the total processing time. In order to get a more efficient scheme than the CS model, we propose another model called a client-agent-server model (CAS model), which is derived by adding agent processors to the CS model. We formulate the problem of test generation on the CAS model, and analyze the relation between the number of processors and the total processing time. Our analysis leads to an optimal scheme for the CAS model which minimizes the total processing time for a given number of processors. We present experimental results for the ISCAS benchmark circuits by implementing the CAS model on a network of workstations.< >

关键词： parallel processing Content addressable storage Circuit testing Logic testing Logic circuits Computer networks Concurrent computing distributed computing Benchmark testing Workstations

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The Virtual Shared Memory Performance of a parallel Graph Reducer

The Virtual Shared Memory Performance of a Parallel Graph Re...

引用

ieee/ACM International symposium on Cluster Computing and the Grid (CCGRID)

作者： H. Loidl Department of Computing and Electrical Engineering Heriot-Watt University Edinburgh UK

This paper assesses the costs of maintaining a virtual shared heap in our parallel graph reducer (GUM), which implements a parallel functional language. GUM performs automatic and dynamic resource management for both work and data. We introduce extensions to the original design of GUM, aiming at a more flexible memory management and communication mechanism to deal with high-latency systems. We then present measurements of running GUM on a Beowulf cluster, evaluating the overhead of dynamic distributed memory management and the effectiveness of the new memory management and communication mechanisms.

关键词： Yarn Memory management parallel processing Sparks Concurrent computing Automatic control Communication system control Cost function Resource management Libraries

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Gamelet: A mobile service component for building multi-server distributed virtual environment on grid

引用

2nd International symposium on parallel and distributed processing and Applications, ISPA 2004

作者： Wang, Tianqi Wang, Cho-Li Lau, Francis Department of Computer Science The University of Hong Kong Pokfulam Hong Kong

ISBN: (纸本)9783540241287

A DVE system provides a computer-generated virtual world where individuals located at different places could interact with each other. In this paper, we present the design of a grid-enabled service oriented framework for facilitating the building of DVE systems on Grid. A service component named "gamelet" is proposed. Each gamelet is characterized by its load awareness, high mobility, and embedded synchronization. Based on gamelet, we show how to re-design the existing monopolistic model of a DVE system into an open and service-oriented system that can fit into current Grid/OGSA framework. We also demonstrate an adaptive gamelet load-balancing (AGL) algorithm that helps the DVE system achieve better performance. We evaluate the performance through a multiplayer online game prototype implemented on Globus Toolkit. Results show that our approach can achieve faster response time and higher throughput. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Virtual reality

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Fault-tolerant wormhole routing algorithm in 2d meshes without virtual channels

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2nd International symposium on parallel and distributed processing and Applications, ISPA 2004

作者： Zhou, Jipeng Lau, Francis C. M. Department of Computer Science Jinan University Guang Zhou510632 China Department of Computer Science The University of Hong Kong Pokfulam Hong Kong

ISBN: (纸本)9783540241287

In wormhole meshes, many routing algorithms prevent deadlocks by enclosing faulty nodes within faulty blocks. None of them however can tolerate the convex fault model without virtual channels. We propose a deterministic fault-tolerant wormhole routing algorithm for mesh networks that can handle disjoint convex faulty regions. These regions would not contain any nonfaulty nodes. The proposed algorithm does not use any virtual channels, which routes the messages using an extended X-Y routing algorithm in the fault-free regions. The algorithm is deadlock- and livelock-free. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Routing algorithms

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A space-efficient on-chip compressed cache organization for high performance computing

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2nd International symposium on parallel and distributed processing and Applications, ISPA 2004

作者： Yim, Keun Soo Lee, Jang-Soo Kim, Jihong Kim, Shin-Dug Koh, Kern School of Computer Science and Engineering Seoul National University Seoul Korea Republic of IBM Poughkeepsie New York United States Department of Computer Science Yonsei University Seoul Korea Republic of

ISBN: (纸本)9783540241287

In order to alleviate the ever-increasing processor-memory performance gap of high-end parallel computers, on-chip compressed caches have been developed that can reduce the cache miss count and off-chip memory traffic by storing and transferring cache lines in a compressed form. However, we observed that their performance gain is often limited due to their use of the coarse-grained compressed cache line management which incurs internally fragmented space. In this paper, we present the fine-grained compressed cache line management which addresses the fragmentation problem, while avoiding an increase in the metadata size such as tag field and VM page table. Based on the SimpleScalar simulator with the SPEC benchmark suite, we show that over an existing compressed cache system the proposed cache organization can reduce the memory traffic by 15%, as it delivers compressed cache lines in a fine-grained way, and the cache miss count by 23%, as it stores up to three compressed cache lines in a physical cache line. © Springer-Verlag Berlin Heidelberg 2004.

关键词： parallel processing systems

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A peer-to-peer mechanism for resource location and allocation over the grid

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2nd International symposium on parallel and distributed processing and Applications, ISPA 2004

作者： Hsiao, Hung-Chang Baker, Mark King, Chung-Ta Computer and Communication Research Center National Tsing-Hua University 300 Taiwan The Distributed Systems Group University of Portsmouth PO1 2EG United Kingdom Department of Computer Science National Tsing-Hua University 300 Taiwan

ISBN: (纸本)9783540241287

Recent advances in P2P lookup overlays provide an appealing solution for distributed search without relying on a single database server. In addition to performing resource discovery, these P2P substrates also offer membership management for dynamic peers. In this paper, we propose a publicly shared architecture called VC2A that takes advantage of a P2P lookup substrate for computational applications. VC2A targets computational master-slave applications. An application running in VC2A dynamically allocates resources from the system on the fly. These allocated resources then self-manage and -heal. We have implemented an architecture based on our previous efforts that include an enhanced P2P lookup overlay and a mobile agent system on top of this overlay. We show that VC2A is not only scalable but robust, and takes advantage of heterogeneity of the resources. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Substrates

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