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Characterizing heterogeneous computing environments using singular value decomposition

Characterizing heterogeneous computing environments using si...

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2010 IEEE international symposium on parallel and distributed Processing, Workshops and Phd Forum, IPDPSW 2010

作者： Al-Qawasmeh, Abdulla M. Maciejewski, Anthony A. Siegel, Howard Jay Department of Electrical and Computer Engineering Colorado State University Fort Collins CO United States Department of Computer Science Colorado State University Fort Collins CO United States

ISBN: (纸本)9781424465347

We consider a heterogeneous computing environment that consists of a collection of machines and task types. The machines vary in capabilities and different task types are better suited to specific machine architectures. We describe some of the difficulties with the current measures that are used to characterize heterogeneous computing environments and propose two new measures. These measures relate to the aggregate machine performance (relative to the given task types) and the degree of affinity that specific task types have to different machines. The latter measure of taskmachine affinity is quantified using singular value decomposition. One motivation for using these new measures is to be able to represent a wider range of heterogeneous environments than is possible with previous techniques. An important application of studying the heterogeneity of heterogeneous systems is predicting the performance of different computing hardware for a given task type mix. © 2010 IEEE.

关键词： Singular value decomposition

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Designing topology-aware collective communication algorithms for large scale InfiniBand clusters: Case studies with Scatter and Gather

Designing topology-aware collective communication algorithms...

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2010 IEEE international symposium on parallel and distributed Processing, Workshops and Phd Forum, IPDPSW 2010

作者： Kandalla, Krishna Subramoni, Hari Vishnu, Abhinav Panda, Dhabaleswar K. Department of Computer Science and Engineering Ohio State University United States Pacific Northwest National Laboratory High Performance Computing Group United States

ISBN: (纸本)9781424465347

Modern high performance computing systems are being increasingly deployed in a hierarchical fashion with multi-core computing platforms forming the base of the hierarchy. These systems are usually comprised of multiple racks, with each rack consisting of a finite number of chassis, and each chassis having multiple compute nodes or blades, based on multi-core archi- tectures. The networks are also hierarchical with mul- tiple levels of switches. Message exchange operations between processes that belong to different racks involve multiple hops across different switches and this directly affects the performance of collective operations. In this paper, we take on the challenges involved in detecting the topology of large scale InfiniBand clusters and leveraging this knowledge to design efficient topology-aware algorithms for collective operations. We also propose a communication model to analyze the communication costs involved in collective operations on large scale supercomputing systems. We have analyzed the performance characteristics of two collectives, MPI Gather and MPI Scatter, on such systems and we have proposed topology-aware algorithms for these operations. Our experimental results have shown that the proposed algorithms can improve the performance of these collective operations by almost 54% at the micro-benchmark level. © 2010 IEEE.

关键词： Topology

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3rd international Workshop on Social software engineering

3rd International Workshop on Social Software Engineering

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2010 Workshopband (inkl.Doktorandensymposium), Fachtagung des GI-Fachbereichs softwaretechnik, software engineering 2010 - 2010 Workshop (incl. Doctoral symposium), Conference of the GI Division on software engineering, software engineering 2010

作者： Ebner, Martin Hammouda, Imed Happel, Hans-Jörg Maalej, Walid Reinhardt, Wolfgang

ISBN: (纸本)9783885792543

software is created by people, with people and for people. These people work in varying environments. They have their particular backgrounds and act under different conditions. Thus understanding the human and social aspects of software engineering is crucial to understanding how methods and tools are used, and thereby improving the creation and maintenance of software systems as well as the management of software projects. "Social software engineering" (SSE) focusses on the development of systems in highly uncertain domains, with evolving goals, frequent changes and much user involvement. SSE systems can often (but not exclusively) be found on the web. Related technical concepts are user feedback, mashups, perpetual beta. However, beneath technical expertise developing social software systems requires competency from other disciplines as diverse as psychology, organizational science or economics. Besides the advent of social software applications, software engineering research recognized in recent years that effective collaboration and knowledge sharing are essential in order to guarantee successful software development and maintenance. Methods and tools that support development teams must be based on interdisciplinary research efforts that investigate technologies, tools, processes and human factors in a holistic manner. While both directions - engineering social software and dealing with social aspects in the software engineering process - receive considerable attention, we think that ultimately, both might confluence into a new software engineering paradigm. This workshop provided a forum for discussing high quality research on the social aspects of software engineering and the engineering aspects of social software, as well as a meeting place for the community that is currently distributed over several research domains (software engineering, knowledge management, web 2.0, human computer interaction). © 2010 Gesellschaft fur Informatik (GI). All rights reserved.

关键词： Social aspects

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A churn model based on the global geographical distribution of nodes

A churn model based on the global geographical distribution ...

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9th international symposium on distributed Computing and Applications to Business, engineering and Science (DCABES 2010)

作者： Luo, Qiuming Li, Yun Dong, Wentao Lin, XiaoHui Shenzhen Univ Coll Comp Sci & Software Engn Natl High Performance Comp Ctr Shenzhen Peoples R China

ISBN: (纸本)9780769541105

The dynamics of peer participation, or churn, is critical for design, implementation and evaluation of Peer-to-peer (P2P) systems. The metrics used to characterize the churn is distributions of the node session lengths and arrival intervals. The prior studies setup the model by measuring the historical logs or records, and treat the churn as one whole black-box without understanding the inside of peer's population. We investigate churn in another point of view, and find that modeling it based on the global geographical distribution of peer nodes will result in a system which behave in the way compliant to the measurement taken by previous works. By this model, we do see some more future things than other models. We might expect or predict when and what nodes would return back, as well as when and what nodes would disappear at high possibility. So it is useful when designing a system optimized both to the pass and the future, which could reduce the overhead of the maintenance of underlying overlay network of DHTs and lower the redundant level of replications for P2P storage system.

关键词： Churn Model Global Churn Pattern Peer-to-peer DHT

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Architecting Critical systems - First international symposium, ISARCS 2010, Proceedings

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1st international symposium - Architecting Critical systems, ISARCS 2010

ISBN: (纸本)3642135552

The proceedings contain 11 papers. The topics discussed include: an architectural framework for analyzing tradeoffs between software security and performance;architectural design decisions for achieving reliable software systems;integrating fault-tolerant techniques into the design of critical systems;component behavior synthesis for critical systems;a road to a formally verified general-purpose operating system;engineering a distributed e-voting system architecture: meeting critical requirements;testing fault robustness of model predictive control algorithms;towards net-centric cyber survivability for ballistic missile defense;a safety case approach to assuring configurable architectures of safety-critical product lines;increasing the resilience of critical SCADA systems using peer-to-peer overlays;and ISO/DIS 26262 in the context of electric and electronic architecture modeling.

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Benefits of software Rejuvenation on HPC systems

Benefits of Software Rejuvenation on HPC Systems

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international symposium on parallel and distributed Processing with Applications, ISPA

作者： Nichamon Naksinehaboon Narate Taerat Chokchai Leangsuksun Clayton F. Chandler Stephen L. Scott College of Engineering & Science Louisiana Tech University Ruston LA USA Computer Science and Mathematics Division Oak Ridge National Laboratory Oak Ridge TN USA

Rejuvenation is a technique expected to mitigate failures in HPC systems by replacing, repairing, or resetting system components. Because of the small overhead required by software rejuvenation, we primarily focus on OS/kernel rejuvenation. In this paper, we propose three rejuvenation scheduling techniques. Moreover, we investigate the claim that software rejuvenation prolongs failure times in HPC systems. Also, we compare the lost computing times of the checkpoint/restart mechanism with and without rejuvenation after each checkpoint.

关键词： software reliability Availability Numerical models Hardware Kernel

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An online performance anomaly detector in cluster file systems

An online performance anomaly detector in cluster file Syste...

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international symposium on parallel Architectures, Algorithms, and Programming

作者： Chen, Xin He, Xubin Guo, He Wang, Yuxin Department of Electrical and Computer Engineering Tennessee Technological University Cookeville TN 38505 United States Department of Electrical and Computer Engineering Virginia Commonwealth University Richmond VA 23284 United States School of Software Technology Dalian University of Technology Dalian LiaoNing China School of Computer Science and Technology Dalian University of Technology Dalian LiaoNing China

ISBN: (纸本)9780769543123

Performance problems, which can stem from different system components, such as network, memory, and storage devices, are difficult to diagnose and isolate in a cluster file system. In this paper, we present an online performance anomaly detector which is able to efficiently detect performance anomaly and accurately identify the faulty sources in a system node of a cluster file system. Our method exploits the stable relationship between workloads and system resource statistics to detect the performance anomaly and identify faulty sources which cause the performance anomaly in the system. Our preliminary experimental results demonstrate the efficiency and accuracy of the proposed performance anomaly detector. © 2010 IEEE.

关键词： Virtual storage

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On the design of the semantic P2P system for music recommendation

On the design of the semantic P2P system for music recommend...

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IEEE international symposium on parallel and distributed Processing With Applications

作者： Chen, Ming-Hung Lin, Kate Ching-Ju Kung, Chui-Chiu Chou, Cheng-Fu Tu, Chang-Jen Department of Computer Science and Information Engineering National Taiwan University Taipei Taiwan Institute for Information Industry Taipei Taiwan

ISBN: (纸本)9780769541907

The pervasive use of Peer-to-Peer (P2P) systems and the growing demand on personalization for consumers has made future business focus on the niche market instead of the mass market. The recommender system, which is able to timely select data of the interest to each individual user, has become the key to any successful business. However, currently most recommendation systems are based on a centralized architecture;nonetheless, they are not suitable for P2P environments. In this article, we propose a distributed semantic P2P overlay, which can provide music search and recommendation services by considering both of user preference and diversity of interests. We then propose a 3C hybrid recommendation procedure that adapts three traditional filtering techniques to fitting the requirements in a distributed semantic overlay. First, we choose a set of proper meta-data to represent a music object and use them to construct the characteristic-vector-based content filter. Second, a dominant attribute, which is one of the attributes in the characteristic vector of a music object, is used to build the profile of a peer. With the idea of the social network, a P2P profile-based collaborative filter is proposed. Finally, we explore the item-to-item relationship to construct a history-based cooperative filter. We use simulations and a real database called AudioScrobbler, which tracks users' listening habits, to evaluate the performance of the recommendation system. The results demonstrate the effectiveness of the proposed approach compared with existing recommendation systems. © 2010 IEEE.

关键词： Recommender systems

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DEBAR: A scalable high-performance De-duplication storage system for backup and archiving

DEBAR: A scalable high-performance De-duplication storage sy...

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24th IEEE international parallel and distributed Processing symposium, IPDPS 2010

作者： Yang, Tianming Jiang, Hong Feng, Dan Niu, Zhongying Zhou, Ke Wan, Yaping School of Computer Huazhong University of Science and Technology Wuhan National Laboratory for Optoelectronics Wuhan 430074 China Department of Computer Science and Engineering University of Nebraska-Lincoln Lincoln NE 68588 United States

ISBN: (纸本)9781424464432

Driven by the increasing demand for large-scale and high-performance data protection, disk-based de-duplication storage has become a new research focus of the storage industry and research community where several new schemes have emerged recently. So far these systems are mainly inline de-duplication approaches, which are centralized and do not lend themselves easily to be extended to handle global de-duplication in a distributed environment. We present DEBAR, a de-duplication storage system designed to improve capacity, performance and scalability for de-duplication backup/archiving. DEBAR performs postprocessing de-duplication, where backup streams are de-duplicated and cached on server-disks through an in-memory preliminary filter in phase I, and then completely de-duplicated in-batch in phase II. By decentralizing fingerprint lookup and update, DEBAR supports a cluster of servers to perform de-duplication backup in parallel, and is shown to scale linearly in both write throughput and physical capacity, achieving an aggregate throughput of 1.7GB/s and supporting a physical capacity of 2PB with 16 backup servers. © 2010 IEEE.

关键词： Digital storage

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Predictibility of inter-component latency in a software communications architecture operating environment

Predictibility of inter-component latency in a software comm...

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2010 IEEE international symposium on parallel and distributed Processing, Workshops and Phd Forum, IPDPSW 2010

作者： Abgrall, Gael Le Roy, Frédéric Diguet, Jean-Philippe Gogniat, Guy Delahaye, Jean-Philippe UEB ENSIETA DTN 2 rue Francois Verny 29806 Brest Cedex 9 France UEB UBS Lab-STICC BP 92116 56321 Lorient Cedex France DGA CELAR La Roche Marguerite 35174 Bruz France

ISBN: (纸本)9781424465347

This paper presents an in-depth analysis of the behavior of a SCA component-based waveform application in terms of "inter-component" communication latency. The main limitation with SCA, in the context of embedded systems, is the additional cost introduced by the use of CORBA. Previous studies have already defined the major metrics of interest regarding this issue, these are CPU cost, memory requirements and "inter-component" latency. Real-time systems can not afford high latency, in consequence, this paper focuses on this metric. The starting point of this paper is the desire of knowing if the SCA CF does not also bring an overhead. Measurements have been realized with OmniORB as CORBA distribution and OSSIE for SCA implementation. In order to perform these measurements, a SCA waveform composed of several "empty-components" have been created. "Empty-components" are software components compliant to SCA without any signal processing part. The study only focuses on communications between components. The same kind of "inter-component" link has been measured between two components using CORBA without SCA. It is possible to compare the latency values between the two measurements and to show as a result that they are approximately the same. The CORBA bus is really the part which brings an overhead to the system. The final part of this paper introduces a statistical estimation of the latency distributions. It results from measurements performed with various data packet sizes and uses a fitting method based on a combination of Gaussian functions. © 2010 IEEE.

关键词： Common object request broker architecture (CORBA)

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