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Enhancing the effective utilisation of Grid clusters by exploiting on-line performability analysis

Enhancing the effective utilisation of Grid clusters by expl...

引用

5th IEEE international symposium on Cluster computing and the Grid (CCGrid 2005)

作者： Benoit, A Cole, M Gilmore, S Hillston, J Univ Edinburgh Sch Informat Edinburgh EH9 3JZ Midlothian Scotland

ISBN: (纸本)0780390741

In Grid applications the heterogeneity and potential-failures of the computing infrastructure poses significant challenges to efficient scheduling. Performance models have been shown to be useful in providing predictions on which schedules can be based [1, 2] and most such techniques can also take account of failures and degraded service. However when several alternative schedules are to be compared it is vital that the analysis of the models does not become so costly as to out-weigh the potential gain of choosing the best schedule. Moreover it is vital that the modelling approach can scale to match the size and complexity of realistic applications. In this paper we present a novel method of modelling job execution on Grid compute clusters. As previously we use Performance Evaluation Process Algebra (PEPA) [3] as the system description formalism, capturing both workload and. computing fabric. the novel feature is that we make a continuous approximation of the state space underlying the PEPA model and represent it as a set of ordinary differential equations (ODEs) for solution, rather than a continuous time, but discrete state space, Markov chain.

关键词： distributed computer systems

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An organizational grid of federated MOSIX clusters

An organizational grid of federated MOSIX clusters

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5th IEEE international symposium on Cluster computing and the Grid (CCGrid 2005)

作者： Barak, A Shiloh, A Amar, L Hebrew Univ Jerusalem Dept Comp Sci IL-91904 Jerusalem Israel

ISBN: (纸本)0780390741

MOSIX is a cluster management system that uses process migration to allow a Linux cluster to perform like a parallel computer. Recently it has been extended with new features that could make a grid of Linux clusters run as a cooperative system of federated clusters. On one hand, it supports automatic workload distribution among connected clusters that belong to different owners, while still preserving the autonomy of each owner to disconnect its cluster from the grid at any time, without sacrificing migrated processes from other clusters. Other new features of MOSIX include grid-wide automatic resource discovery;a precedence scheme for local processes and among guest processes (from other clusters);flood control;a secure ran-time environment (Sandbox) which prevents guest processes from accessing local resources in a hosting system, and support of cluster partitions. the resulting grid management system is suitable to create an intra-organizational high-performance computational grid, e.g., in an enterprise or in a campus. the paper presents enhanced and new features of MOSIX and their performance.

关键词： cluster computing grid computing process migration organizational grid sandbox

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Search and index in locality-based clustering overlay

Search and index in locality-based clustering overlay

引用

5th IEEE international symposium on Cluster computing and the Grid (CCGrid 2005)

作者： He, Y Zhang, JZ Niu, XG Zhao, Q Nankai Univ Dept Comp Sci & Technol Tianjin 300071 Peoples R China

ISBN: (纸本)0780390741

A Locality-based Clustering peer-to-peer Overlay networks (LCO) architecture is introduced in this paper. LCO differs from the pure unstructured P2P networks such as Gnutella in two key aspects. First, LCO partitions peers into clusters such that peers belonging to the same cluster are relatively close to one another in terms of network latency. Multiple floods are initiated for one query, with the character that each flood is restricted within one cluster, hence reducing the unnecessary traffic produced by the topology mismatching between the P2P logical overlay network and the physical underlying network. Second, an efficient inter-cluster index scheme is used in LCO such that the search scope can be retained even though only a few clusters are directly probed. Our simulation results indicate that LCO is efficient in both resource usage and data retrieval.

关键词： distributed computer systems

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Benchmarking of a 3D, unstructured, finite volume code for incompressible Navier-Stokes equation on a cluster of distributed-memory computers

Benchmarking of a 3D, unstructured, finite volume code for i...

引用

19th international symposium on High Performance computing Systems and Applications, HPCS 2005

作者： Karimian, S.A.Mohsen Straatman, Anthony G. University of Western Ontario Department of Mechanical and Materials Engineering London Ont. N6A 5B9 Canada

ISBN: (纸本)0769523439

the parallelization and performance of an implicit, unstructured, time-dependent Computational Fluid Dynamics (CFD) code is described. parallelization of the code is done within the PETSc framework using a single-program-multiple-data (SPMD) message passing model. the parallel code is shown to scale linearly within the limit of the available number of processors. A dynamic convergence criteria (DCC) is developed to enhance the performance of the code by linking the nonlinear convergence of the code and the solver convergence. the implementation of an appropirate choice of DCC in the code was shown a good improvements with the speedups of over four times in terms of wall-clock time. © 2005 IEEE.

关键词： distributed computer systems

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On two-dimensional mesh networks and their simulation with P systems

On two-dimensional mesh networks and their simulation with P...

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5th international Workshop on Membrane computing, WMC 2004

作者： Ceterchi, Rodica Pérez-Jiménez, Mario J. Faculty of Mathematics and Computer Science University of Bucharest Academiei 14 010014 Bucharest Romania Research Group on Natural Computing Department of Computer Science and Artificial Intelligence University of Sevilla Avda. Reina Mercedes s/n 41012 Sevilla Spain

We analize in this paper the possibility of simulating the parallel architecture SIMD-MC2, also known as the two-dimensional mesh, with P systems with dynamic communication graphs. We illustrate this simulation for an algorithm which computes the sum of given integers. Next, we show how to extend the formalism to the reduction problem. © Springer-Verlag Berlin Heidelberg 2005.

关键词： distributed computer systems

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Security challenges of distributed e-learning systems

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Advanced distributed Systems - 5th international School and symposium, ISSADS 2005, Revised Selected Papers

作者： Cárdenas, Roberto Gómez Sánchez, Erika Mata ITESM-CEM 52926 Edo. de México Mexico LRIA EPHE Université Paris 8 41 rue Gay Lussac 75005 Paris

ISBN: (纸本)3540280634

Security considerations play an increasingly important role for distributed computing. In today's Internet age, academia requires sharing, distributing, merging, changing information, linking applications and other resources within and among universities and other related organizations. Because e-learning systems are open, distributed and interconnected, then security becomes an important challenge in order to insure that interested actors only have access to the right information at the appropriate time. the purpose of this paper is to give an in-depth understanding of most important security challenges that can be relevant for distributed e-learning systems. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Learning systems

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A state-space search approach for optimizing reliability and cost of execution in distributed sensor networks 1

引用

7th international Workshop on distributed computing, IWDC 2005

作者： Sekhar, Archana Manoj, B.S. Siva Ram Murthy, C. McKinsey and Company Mumbai 400 021 India Department of Electrical and Computer Engineering University of California at San Diego San Diego CA 92093 United States Department of Computer Science and Engineering Indian Institute of Technology Madras Chennai 600 036 India

ISBN: (数字)9783540324287

ISBN: (纸本)3540309594

Sensor networks are increasingly being used for applications which require fast processing of data, such as multimedia processing. distributed computing can be used on a sensor network to reduce the completion time of a task and distribute the energy consumption equitably across all sensors. the distribution of task modules to sensors should consider not only the time and energy savings, but must also improve reliability of the entire task execution. We formulate the above as an optimization problem, and use the A* algorithm with improvements to determine an optimal static allocation of modules among a set of sensors. We also suggest a faster but suboptimal algorithm, called the greedy A* algorithm. Both algorithms have been simulated, and the results have been compared in terms of energy savings, decrease in completion time of the task, and the deviation of the sub-optimal solution from the optimal one. the sub-optimal solution required 8-35% less computation, at the cost of 2.5-15% deviation from the optimal solution in terms of average energy spent per sensor node. Both the A* and greedy A* algorithms have been shown to distribute energy consumption more uniformly across sensors than centralized execution. the greedy A* algorithm is found to be scalable, as the number of evaluations in determining the allocation increases linearly with the number of sensors. © Springer-Verlag Berlin Heidelberg 2005.

关键词： distributed computer systems

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Tight bounds for wavelength assignment on trees of rings

Tight bounds for wavelength assignment on trees of rings

引用

19th IEEE international parallel and distributed Processing symposium, IPDPS 2005

作者： Bian, Zhengbing Gu, Qian-Ping Zhou, Xiao School of Computing Science Simon Fraser University Burnaby BC V5A 1S6 Canada Graduate School of Information Sciences Tohoku University Sendai 980-8579 Japan

ISBN: (纸本)0769523129

A fundamental problem in communication networks is wavelength assignment (WA): given a set of routing paths on a network, assign a wavelength to each path such that the paths with the same wavelength are edge-disjoint, using the minimum number of wavelengths. the WA problem is NP-hard for a tree of rings network which is well used in practice. In this paper, we give an efficient algorithm which solves the WA problem on a tree of rings with an arbitrary (node) degree by at most 3L wavelengths and achieves an approximation ratio of 2.75 asymptotically, where L is the maximum number of paths on any link in the network. the 3L upper bound is tight that there are instances of the WA problem that require at least 3L wavelengths even on a tree of rings with degree four. We also give a 3L and 2-approximation algorithm for the WA problem on a tree of rings with degree at most six. Previous results include: 4L (resp. 3L) wavelengths for trees of rings with arbitrary degrees (resp. degree at most eight), and 2-approximation (resp. 2.5-approximation) algorithm for trees of rings with degree four (resp. six).

关键词： Trees (mathematics)

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From Grid Technologies (in 6th of IST RTD 2002-2006) to knowledge Utility

From Grid Technologies (in 6th of IST RTD 2002-2006) to know...

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international symposium on parallel and distributed computing

作者： V.R. Obozinski Vincent R. Obozinski

An overview of the Strategic Objective on Advanced Grid Technologies, Systems and Services under the IST (Information Society Technologies) thematic priority of the 6th European RTD Framework Programme (2002-2006) will be provided. the evolution and progress since the 5th Framework Programme will be sketched. the presentation will include a brief description of the portfolio of 12 new projects - with a total EU funding of 52 million € - that were launched in the 2nd half of 2004. Latest strategic planning activities with regard to the Strategic Objective - particularly in the context of the European Research Area - will be covered in relative details. the related topics (S.O. 2.5.4) of the IST Work Programme 2005- 2006 - as specified for Call 5 - will be addressed in an exhaustive manner. Future perspectives for the 7th Framework Programme (2007-2013) regarding the ICT technology pillar on/ Software, Grids, Security and Dependability/ as laid out in the Commission proposal of April 2005 will be outlined on a high level. A question and answer time will follow the presentation.

关键词： Business Financial management Strategic planning Civil engineering Design engineering Systems engineering and theory Computer networks Telecommunication computing Packet switching Banking

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distributed choice function hyper-heuristics for timetabling and scheduling

引用

5th international Conference on Practice and theory of Automated Timetabling, PATAT 2004

作者： Rattadilok, Prapa Gaw, Andy Kwan, Raymond S. K. School of Computing University of Leeds United Kingdom

ISBN: (纸本)3540307052

this paper investigates an emerging class of search algorithms, in which high-level domain independent heuristics, called hyper-heuristics, iteratively select and execute a set of application specific but simple search moves, called low-level heuristics, working toward achieving improved or even optimal solutions. parallel architectures have been designed and evaluated. Results based on a university timetabling problem show an important relationship between performance, algorithm software and hardware implementation. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Algorithms

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