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检索条件"任意字段=20th International Conference on Parallel and Distributed Computing Systems, PDCS 2007"

共 306 条记录，以下是41-50 订阅

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parallel algorithms for a visual text mining platform

Parallel algorithms for a visual text mining platform

引用

20th IASTED international conference on parallel and distributed computing and systems, pdcs 2008

作者： Almeida, Márcio O. Mello, Rodrigo F. Oliveira, Maria C.F. ICMC University of São Paulo São Carlos São Paulo Brazil

ISBN: (纸本)9780889867741

Current visual text mining platforms are still focused on small or medium-scale datasets and sequential algorithms. However, as document collections increase in size and complexity, more computing resources are required in order to achieve the expected interactive experience. In order to address the scalability problem, this paper proposes and evaluates parallel implementations for three critical visual text mining algorithms. Experiments with the parallel solutions were conducted for varying dataset sizes and different numbers of processors. the results show a good speedup for the proposed solutions and indicate the potential benefits of exploring task parallelism in critical algorithms to improve scalability of an interactive visual text mining platform.

关键词： parallel algorithms

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An improved prioritization method for task scheduling in heterogeneous computing systems

An improved prioritization method for task scheduling in het...

引用

20th IASTED international conference on parallel and distributed computing and systems, pdcs 2008

作者： Yu, Han Home and Networks Mobility Motorola Inc. 1299 E. Algonquin Road Schaumburg IL 60196 United States

ISBN: (纸本)9780889867741

Scheduling the execution of computing tasks for heterogeneous computing systems is a widely studied problem in the field of parallel and distributed computing. Many algorithms belong to list scheduling algorithms in which tasks are scheduled sequentially in the order of their pre-assigned priorities. the determination of task priorities is typically based on problem-specific heuristics, which is critical to the performance of a list scheduling algorithm. We design a list scheduling algorithm for heterogeneous computing systems in which task priorities are determined by both the completion time and upward rank of a task. We extend the notion of upward ranks used in HEFT and our method of calculating a task's upward rank improves over the method used in HEFT, with the inclusion of additional domain knowledge embedded in scheduling problems. As a result, more accurate estimation of the execution time of remaining tasks can be achieved. Experimental results on benchmark task graphs show that our algorithm consistently outperforms HEFT with higher execution speedups.

关键词： Scheduling algorithms

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Real-time agent service layer for distributed cooperative computing

Real-time agent service layer for distributed cooperative co...

引用

20th IASTED international conference on parallel and distributed computing and systems, pdcs 2008

作者： Lee, Jehyun Ha, Seung Hyun Kim, Tae-Hyung Department of Computer Science and Engineering Hanyang University 1271 Sa 3-Dong Ansan Kyunggi-Do 426-791 Korea Republic of

ISBN: (纸本)9780889867741

While distributed multi-agent systems are especially suitable for taking advantage of the capacity for evolution and adaptation in ubiquitous computing, writing such programs is a difficult and complicated task if not supported by an agent programming framework. this paper presents a real-time agent service layer (RT-ASL) that is built on an existing de facto standard for interconnecting distributed objects, CORBA middleware. RT-ASL enables programmers to write distributed cooperative application programs for ubiquitous computing using a high-level abstraction of software agents. As criteria for designing RT-ASL on CORBA, we have made four important decisions regarding the message passing communication mechanism for agent communications, agent service discovery mechanism, real-time agent communication language, and real-time generic scheduling interfaces. this paper justifies the importance of such design decisions and how they can effectively deal with the complicated difficulties.

关键词： Multi agent systems

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A fault-tolerant parallel optimization tool based on an evolutionary strategy

A fault-tolerant parallel optimization tool based on an evol...

引用

20th IASTED international conference on parallel and distributed computing and systems, pdcs 2008

作者： Maier, Klaus Hönig, Udo Schiffmann, Wolfram Department of Mathematics and Computer Science University of Hagen 58084 Hagen Germany

ISBN: (纸本)9780889867741

In engineering applications often real-valued performance functions must be optimized. If the performance function is discontinuous, there exist no derivations with respect to the parameters that should be optimized. thus, we can only use undirected search methods. In contrast to simple trial-and-error approaches, evolutionary strategies can extract population-based information that guide the search process and help to improve the quality of the results. the paper describes the parallel implementation of an state-of-the-art evolutionary strategy which uses the covariance adaptation operator. It proposes a communication topology for maintaining selective pressure and a master-slave scheme for fault tolerance in distributed environments which are composed of volatile resources. Experimental results demonstrate how the implementation can be adapted to specific needs and how the parallel implementation behaves in the case of resource failures.

关键词： Fault tolerance

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A patch-based partitioner for parallel SAMR applications

A patch-based partitioner for parallel SAMR applications

引用

20th IASTED international conference on parallel and distributed computing and systems, pdcs 2008

作者： Johansson, Henrik Vakili, Abbas Dept. of Information Technology Scientific Computing Uppsala University Box 337 S-751 05 Uppsala Sweden

ISBN: (纸本)9780889867741

To achieve good parallel efficiency, applications using structured adaptive mesh refinement (SAMR) need to repeatedly repartition and redistribute the underlying dynamic grid hierarchy. However, no single partitioner works well for all application and computer states. this paper presents the implementation and evaluation of a patch-based partitioner for SAMR grid hierarchies. the partitioner results in a good and stable load balance, on average 3.1%. Space-filling curves are used to reduce the high communication volumes that are inherent in this type of partitioner. the partitioner will be a part of the Meta-Partitioner, a partitioning framework that automatically selects, configures and invokes good-performing partitioners for general SAMR applications. Access to a large number of complementing partitioners is essential for the Meta-Partitioner. the presented partitioner will help to significantly decrease run-times for SAMR applications where load balance is the main priority.

关键词： Mesh generation

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Multiple-aspect malicious code detection for component survivability in distributed environments

Multiple-aspect malicious code detection for component survi...

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20th IASTED international conference on parallel and distributed computing and systems, pdcs 2008

作者： Park, Joon S. An, Gaeil Suresh, Avinash Syracuse University Syracuse NY United States

ISBN: (纸本)9780889867741

As information systems develop into larger and more complex implementations, the need for survivability increases. When components are exported from a remote system to a local system under different administrative settings and deployed in different environments we have to guarantee the proper execution of those remote components in the currently working environment because the remote components may have failures or malicious codes that can affect the local computing environment. In this paper, we address a multiple-aspect testing approach, which is able to increase the possibility of detecting a fault in a component by having various ways possible to conduct the test on the components. We have implemented a prototype that provides for the multiple-aspect testing for the downloaded components in runtime without access to the source code. Finally, the implementation of the multiple-aspect testing is evaluated and analyzed in terms of detection performance and accuracy.

关键词： Malware

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Prospects of co-allocation strategies for a lightweight middleware in grid computing

Prospects of co-allocation strategies for a lightweight midd...

引用

20th IASTED international conference on parallel and distributed computing and systems, pdcs 2008

作者： Schley, Lars Robotics Research Institute Section Information Technology Dortmund University of Technology 44221 Dortmund Germany

ISBN: (纸本)9780889867741

Currently, middleware systems for Grid computing like gLite do not integrate knowledge about data availability into the scheduling process. that is, data may be on tertiary storage, e.g. hierarchical storage management, and first access is delayed. To this end, we investigate the gLite middleware software stack and highlight those services which could be enhanced to increase system utilization. Here, we focus on modifications of the workload management system and the computing element. As the computing element depends on a resource management system, we discuss the impact of file systems on the scheduling process. Optimizing the LHCb job workflow, we design a scheduling strategy which respects those constraints. Conceptually, this strategy performs a co-allocation of data movements concurrently to computational processes. Based on a workload trace from the parallel Workload Archive we are able to present improvements in terms of system utilization and average weighted response time.

关键词： Information management

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An O(1)-rounds Deterministic distributed Approximation Algorithm for the Traveling Salesman Problem in Congested Clique 20

An O(1)-rounds Deterministic Distributed Approximation Algor...

引用

20th Annual international conference on distributed computing in Smart Sensor systems and the Internet of things (DCOSS-IoT)

作者： Saikia, Parikshit Natl Inst Technol Silchar Assam India

ISBN: (纸本)9798350369458;9798350369441

We study the Traveling Salesman Problem (TSP) in the Congested Clique Model (CCM) of distributed computing. We present a deterministic distributed algorithm that computes a tour for the TSP using O(1) rounds and O(m) messages for a given undirected weighted complete graph of n nodes and m edges with an approximation factor 2 of the optimal. the TSP has wide applications in logistics, planning, manufacturing and testing microchips, DNA sequencing etc., and we claim that our proposed O(1)-rounds approximation algorithm to the TSP, which is fast and efficient, can also be used to minimize the energy consumption in Wireless Sensor Networks.

关键词： Traveling Salesman Problem distributed computing Approximation Congested Clique

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An automatic cost-based framework for seamless application migration in Grid environments

An automatic cost-based framework for seamless application m...

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20th IASTED international conference on parallel and distributed computing and systems, pdcs 2008

作者： Klemm, Michael Veldema, Ronald Philippsen, Michael Computer Science Department 2 University of Erlangen-Nuremberg Martensstr. 3 91058 Erlangen Germany

ISBN: (纸本)9780889867741

Grid computing promises to seamlessly deliver computing power to computational scientists. However, scientists are faced with the problem of finding computing resources for their application and they have to cope with the systems' batch operation mode that causes premature termination of applications if they exceed the reserved resource limits. In this paper, we propose a middleware layer (OGRE) for a seamless Grid environment. OGRE automates the process of resource discovery and performs resource selection. Resource selection uses a cost-based migration strategy that allocates free computing resources on accessible clusters, i. e., OGRE automatically checkpoints, transfers the snapshot from one cluster to the next, and restarts the application there. A Grid-wide file system handles data accesses of migrated applications. OGRE can easily be adapted to new requirements due to its component-based architecture.

关键词： Grid computing

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distributed Task-based Runtime systems - Current State and Micro-Benchmark Performance 20

Distributed Task-based Runtime Systems - Current State and M...

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20th IEEE international conference on High Performance computing and Communications (HPCC) / 16th IEEE international conference on Smart City (SmartCity) / 4th IEEE international conference on Data Science and systems (DSS)

作者： Hoque, Reazul Shamis, Pavel Univ Tennessee Knoxville TN 37916 USA Arm Cambridge England

ISBN: (纸本)9781538666142

High Performance computing systems are moving heavily towards many-core processors with a deep hierarchy of memory. Accelerators like GPUs are widely being used for general purpose computing and processor architectures are becoming increasingly complex to accommodate performance boost. this trend towards complex heterogeneous architecture makes the job of scientific application developers difficult in terms of performance, portability and productivity. With memory being distributed, this challenge becomes even more complex. Programming many-core shared memory systems are most widely accomplished using OpenMP, while MPI is used to manage the communications in a distributed system. Even though MPI provides a rich set of features, it is too explicit making users responsible for overlapping communication and computation. Task-based runtime systems have emerged as a solution to this challenge of programming these modern complex systems. this study surveys the landscape of task-based runtime systems that support distributed memory and presents a set of benchmark for evaluating and understanding runtime-performance and overheads of these systems.

关键词： Task analysis Runtime Benchmark testing Programming Tools Computer architecture parallel processing

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