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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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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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A hybrid scheduling scheme for large-scale heterogeneous environments

A hybrid scheduling scheme for large-scale heterogeneous env...

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

作者： Ohno, Kazuhiko Matsumoto, Masaki Katano, Satoshi Sasaki, Takahiro Kondo, Toshio Nakashima, Hiroshi Department of Information Engineering Mie University 1577 Kurimamachiya-cho Tsu Mie 514-8507 Japan Academic Center for Computing and Media Studies Kyoto University Yoshida-Honmachi Sakyo-ku Kyoto 606-8501 Japan

ISBN: (纸本)9780889867741

We are developing a task parallel script language MegaScript for parallel processing on large-scale widely-distributed environments. To achieve high performance, MegaScript requires a scheme that efficiently schedules dependent tasks to be executed on a heterogeneous environment. However, the scheduling overhead of existing static schemes are too large while dependency among tasks reduces efficiency of simple dynamic scheduling schemes. Therefore, we propose a combination of multiple schemes to have an efficient hybrid scheduling scheme. To reduce the overhead of static scheduling, we use multi-layered schedulers: the upper layer makes rough global scheduling, and the lower layer makes precise local scheduling. We also incorporate a dynamic scheduler into our scheduler to cope with dynamic change of the system performance. The evaluation using abstract simulation exhibited 6.9-9.8 times speed-up and good scalability, compared to a single level static scheduler.

关键词： Grid computing

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Transactional data sharing in grids

Transactional data sharing in grids

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

作者： Müller, Marc-Florian Möller, Kim-Thomas Sonnenfroh, Michael Schöttner, Michael Institut für Informatik Heinrich-Heine-Universität Düsseldorf 40225 Düsseldorf Germany

ISBN: (纸本)9780889867741

The EU-funded XtreemOS project implements a Linux-based grid operating system (OS), exploiting resources of virtual organizations through the standard POSIX interface. The Object Sharing Service (OSS) of XtreemOS addresses the challenges of transparent data sharing for distributed applications running in grids. We focus on the problem of handling consistency of replicated data in wide area networks in the presence of failures. The software architecture we propose interweaves concepts from transactional memory and peer-to-peer systems. Speculative transactions relieve programmers from complicated lock management. Super-peer-based overlay networks improve scalability and distributed hash tables speed up data search. OSS replicates objects to improve reliability and performance. In case of severe faults, the XtreemOS grid checkpointing service will support OSS. In this paper we describe the software architecture of OSS, design decisions, and evaluation results of preliminary experiments with a multi-user 3D virtual world.

关键词： distributed computer systems

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Alliance-oriented security architecture and technologies in collaborative e-commerce system

Alliance-oriented security architecture and technologies in ...

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

作者： Si, Haiyang Fang, Zhiyi Yin, Yumei Zhao, Hui School of Computer Science and Technology Jilin University Changchun 130012 China Graduate University of Chinese Academy of Sciences Beijing China Shenyang Institute of Computing Technology Shenyang China Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun 130033 China School of Computer Science and Engineering ChangChun University of Technology Changchun 130012 China

ISBN: (纸本)9780889867741

Collaborative commerce and design environment is characterized by of its numerous users, massive resources and dynamic change. In order to solve security problems coming from multi-domain, heterogeneity and dynamics, the security architecture for collaborative commerce and design environment was constructed throuth adoptting Internet Protocol Security(IPSec), Secure Socket Layer(SSL), Simple Object Access Protocol Security(SOAPSec). The enabling technologies including IPSec-based Virtual Private Net(VPN), secure e-commence and cooperation framework, digital authentication and encryption of data were discussed in detail. The architecture and the enabling technologies provided the security mechanism amongst the partners to realize business collaboration, design collaboration in network business pattern.

关键词： Authentication

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The impact of multi-core architectures on task retrieval policies for volunteer computing

The impact of multi-core architectures on task retrieval pol...

引用

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

作者： Toth, David Department of Computer Science Merrimack College North Andover MA 01845 United States

ISBN: (纸本)9780889867741

Volunteer computing projects use donated CPU time to solve problems that would otherwise be too computationally intensive to solve. The donated CPU time comes from computers whose owners install a volunteer computing client program on their computer, allowing a project to use the computer's idle time. The low participation rate in volunteer computing and the increasing number of volunteer computing projects make improvements that more effectively use the donated CPU cycles very important. Past work showed that using certain task retrieval policies could increase the number of tasks volunteer computing clients complete. However, the past work assumed that the volunteered computers had a single CPU and the task retrieval methods that resulted in more completed tasks required the client to be connected to the Internet more often than the other policies. We simulated the task retrieval policies for computers with multi-core CPUs and found that in most cases, the multi-core architecture can lead to a slightly greater than linear increase in the number of tasks that the clients complete, relative to the number of cores the computer running the client has. Additionally, the multi-core architecture can reduce the performance gap between the best and worst performing policies significantly, affecting which policies are used.

关键词： distributed computer systems

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On the timeliness of a cluster based large scale online video surveillance

On the timeliness of a cluster based large scale online vide...

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

作者： Sinha, Koushik Chowdhury, Atish Datta Ghosh, Subhas K. Banerjee, Satyajit Honeywell Technology Solutions 151/1 Bannerghatta Road Bangalore 560076 India

ISBN: (纸本)9780889867741

Timeliness is an important issue for video based surveillance and is often quantified by the delay between the time of availability of image frames from cameras and completion of their processing. Most existing commercial video surveillance systems focus on the issues of efficient storage and retrieval, remote monitoring, data streaming, forensics and limited real-time analysis - but not explicitly on the timeliness issues of large scale online analysis vis-a-vis resource utilization. In this paper we present a new load distribution strategy for on-line, large scale video data processing clusters that are used as an aid to manual surveillance. We propose a novel approach for fine grained load balancing, modeled as a minimization of average completion time problem. The proposed approach is robust in the sense that it is not dependent on the estimates of future loads or on the worst case execution requirements of the video processing load. Simulation results with real-life video surveillance data establish that for a desired timeliness in processing the data, our approach reduces the number of compute nodes by more than a factor of two, compared to systems without the load migration heuristics.

关键词： Cluster computing

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Simulation of level-2 cache locking in multicore parallel computing systems

Simulation of level-2 cache locking in multicore parallel co...

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

作者： Rani, Manira Asaduzzaman, Abu Koivisto, Darryl Department of Computer Science and Engineering Florida Atlantic University 777 Glades Road SE43-409 Boca Raton FL 33431 United States Architecture Modeling Group Mirabilis Design Inc. 3000 Scott Blvd Santa Clara CA 95054 United States

ISBN: (纸本)9780889867741

In order to fulfill the demands for increased performance / power ratio, most chip-vendors are deploying multicore processors to their product lines. Multicore processors are frequently deployed with multilevel cache memories. parallel thread execution in such a multicore system is difficult as it relates to cache sharing to achieve the best performance. Due to the increased execution time unpredictability, it becomes a challenge to support realtime applications on multicore systems with multilevel caches. Studies show that predictability can be improved using cache locking techniques. However, entire locking at level-1 cache may be inefficient for smaller data size (when compared with the cache size). Also, way locking at level-1 cache is not permitted on some processors (like PowerPC 750GX), but way locking at level-2 cache is possible. By locking at level-2 cache, Xenon processor achieves the effect of using local storage by Cell SPEs. In this work, we simulate a multicore parallel computing system with two levels of caches to explore the impact of level-2 cache locking on the performance, power consumption, and predictability. Experimental results show that performance and predictability can be increased and power consumption can be decreased by adding a level-2 cache locking mechanism to an efficient cache sharing structure.

关键词： Electric power utilization

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A distributed algorithm for disjoint paths in star networks

A distributed algorithm for disjoint paths in star networks

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

作者： Hamad, Ahmad Karaata, Mehmet Hakan Department of Computer Engineering Kuwait University P.O. Box 5969 Safat 13060 Kuwait

ISBN: (纸本)9780889867741

A stabilizing system guarantees that, regardless of the current configuration, the system reaches a legal configuration in a bounded number of steps and the system configuration remains legal thereafter. Whereas, a stabilizing system that maintains no explicit variables in the processes of the system is referred to as an inherently stabilizing system, and hence all system states are legal by construction. Due to this attribute, inherently stabilizing systems are immune to transient faults and do not experience any delay due arbitrary system initialization. We view a fault that perturbs the system configuration but not the program as transient fault. Due to these features, inherently stabilizing distributed protocols for peer-to-peer, sensor and mobile networks are desirable. Hypercube, star networks and their variations that provide an increased degree of scalability have been initially design for parallel networks. However, their scalability and the presence of multiple disjoint paths in these topologies make them viable alternatives to existing peer-to-peer and sensor networks topologies. In this paper, we proposed an inherently stabilizing algorithm for delivering messages over all node-disjoint paths from a process to another in star networks. The proposed algorithm has numerous applications including VLSI layout, reliable networks routing, secure message transmission, and network survivability. The proposed routing algorithm is optimal with respect to its state space and lengths of the node-disjoint paths.

关键词： Peer to peer networks

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RAS and Job log data analysis for failure prediction for the IBM Blue Gene/L

RAS and Job log data analysis for failure prediction for the...

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

作者： Solano-Quinde, Lizandro D. Bode, Brett M. Scalable Computing Laboratory Ames Laboratory 312 Wilhelm Hall Ames IA United States

ISBN: (纸本)9780889867741

Currently, the computational needs of scientific applications have grown to levels where it is necessary to have computers with a very high degree of parallelism. The IBM Blue Gene/L can hold in excess of 200K processors and it has been designed for high performance. However, failures in this large system are a major concern, since it has been demonstrated that a failure will drastically decrease the performance of the system. Checkpointing and log schemes have been utilized to overcome these failures, however, it has been shown that these techniques are not as effective as desired. Therefore, proactive failure detection and prediction has gained interest in the research community. In this study, we have collected the RAS event and Job logs from a large IBM Blue Gene/L over a three-month period. We have investigated the relationship among fatal and non-fatal events with the aim of proactive failure prediction. Based on our observations, we have developed a scheme for predicting fatal events based on the spatial and temporal relation among fatal and nonfatal events. We will show that with our scheme up to 84% of fatal events could be effectively predicted.

关键词： Fault tolerance

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