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Distributing fixed time slices in heterogeneous networks of workstations (NOWs)

5th international symposium on parallel and distributed Processing and Applications/ISPA 2007 international Workshops

作者： Nawaz, Yassir Gong, Guang Univ Waterloo Dept Elect & Comp Engn Waterloo ON N2L 3G1 Canada

ISBN: (纸本)9783540747413

Heterogeneous Networks of Workstations (NOWs) offer a cost-effective solution for parallel processing. the completion time of a parallel task over NOWs depends on how the task is divided and distributed among the heterogeneous workstations. In this paper we present a distribution scheme which attempts to minimize the task's completion time over a heterogeneous NOWs. the scheme is based on the idea of distributing fixed time slices of work as opposed to fixed work slices. Our simulations show that the proposed scheme outperforms both fixed and variable work distribution schemes commonly in use. the scheme is very simple and requires no active monitoring of the network. Furthermore it is adaptive and copes very well with the changes in background loads on workstations and network interference.

关键词： networks of workstations parallel processing fixed work slices fixed time slices

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VISIT/GS: Higher level grid services for scientific collaborative Online visualization and steering in UNICORE grids

VISIT/GS: Higher level grid services for scientific collabor...

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6th international symposium on parallel and distributed computing

作者： Riedel, Morris Frings, Wolfgang Dominiczak, Sonja Eickermann, thomas Mallmann, Daniel Gibbon, Paul Dussel, thomas Forschungszentrum Julich John von Neumann Inst Comp Cent Inst Appl Math Postfach 1913 D-52425 Julich Germany

ISBN: (纸本)9780769529172

Many production Grid infrastructures such as DEISA, EGEE, or TeraGrid have begun to offer services to end-users that include access to computational resources. the major goal of these infrastructures is to facilitate the routine interaction of scientists and their work ows with advanced tools and seamless access to computational resources via Grid middleware systems such as UNICORE, gLite or Globus Toolkits. While UNICORE 5 is used in production Grids since several years, recently an early prototype of the new Web services-based UNICORE 6 became available that will be continously improved in the next months for its use in production. In absence of a widely accepted framework for visualization and steering, the new UNICORE 6 Grid middleware provides not such a higher-level service by default. this motivates this contribution to support e-Scientists in upcoming WS-based UNICORE Grids with visualization and steering techniques. In this paper we present the augmentation of the early standards-based UNICORE 6 prototype with a higher-level service for collaborative online visualization and steering. It describes the seamless integration of this service within UNICORE Grids by retaining the convenient single sign-on feature.

关键词： Grid computing

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A parallel infrastructure on dynamic EPIC SMT and its speculation optimization

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5th international symposium on parallel and distributed Processing and Applications, ISPA 2007

作者： Qingying, Deng Minxuan, Zhang Jiang, Jiang PDL College of Computer National University of Defense N Technology Changsha 410073 Hunan China

ISBN: (纸本)3540747419

SMT(simultaneous multithreading) processors execute instructions from different threads in the same cycle, which has the unique ability to exploit ILP(instruction-level parallelism) and TLP(thread-level parallelism) simultaneously. EPIC (explicitly parallel instruction computing) emphasizes importance of the synergy between compiler and hardware. Compiler optimizations are often driven by specific assumptions about the underlying architecture and implementation of the target machine. Control and data speculations are effective ways to improve instruction level parallelism. In this paper, we present our efforts to design and implement a parallel environment, which includes an optimizing, portable parallel compiler OpenUH and SMT architecture EDSMT based on IA-64. Meanwhile, its speculation is also reexamined. © Springer-Verlag Berlin Heidelberg 2007.

关键词： Program compilers

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Virtual distro dispatcher: A costless distributed virtual environment from trashware

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5th international symposium on parallel and distributed Processing and Applications/ISPA 2007 international Workshops

作者： Bertini, Flavio lamanna, D. Davide Baldoni, Roberto Univ Roma La Sapienza Dipartimento Informat & Sistemist Antonio Ruberti Rome Italy

ISBN: (纸本)9783540747413

Obsolete hardware can be effectively reused through intelligent software optimization, which is possible only when source code is available. Virtual Distro Dispatcher (VDD) is a system that produces virtual machines on a central server and projects them on a number of costless physical terminals. VDD is the result of an extreme software optimisation based on virtualization and terminal servers. VDD creates and projects Linux distros that are completely customizable and different from each other. they are virtual desktop machines that can be used for testing or developing and are completely controllable directly from each terminal. Memory consumption has been strongly reduced without sacrificing performances. Test results are encouraging to proceed with the research towards clustering.

关键词： trashware LTSP user mode linux clustering virtualization

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international Workshop on Intelligent Systems and Smart Home (WISH 2007)

International Workshop on Intelligent Systems and Smart Home...

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5th international symposium on parallel and distributed Processing and Applications, ISPA 2007 international Workshops: SSDSN, UPWN, WISH, SGC, ParDMCom, HiPCoMB, and IST-AWSN

作者： Yang, Laurence T. Guo, Minyi Hsu, Ching-Hsien Park, Jong Hyuk Wang, Cho-Li Pan, Gang Seoul National University of Science and Technology Korea Republic of

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distributed recursive learning for shape recognition through multiscale trees

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IMAGE AND VISION computing 2007年第2期25卷 240-247页

作者： Lombardi, Luca Petrosino, Alfredo Univ Pavia Dipartimento Informat & Sistemist I-27100 Pavia Italy Univ Parthenope Napoli Dipartimento Sci Applicate I-80131 Naples Italy

the paper reports an efficient and fully parallel 2D shape recognition method based on the use of a multiscale tree representation of the shape boundary and recursive learning of trees. Specifically, the shape is represented by means of a tree where each node, corresponding to a boundary segment at some level of resolution, is characterized by a real vector containing curvature, length, symmetry of the boundary segment, while the nodes are connected by arcs when segments at successive levels are spatially related. the recognition procedure is formulated as a training procedure made by a Fuzzy recursive neural network followed by a testing procedure over unknown tree structured patterns. the proposed neural network model is able to facilitate the exchange of information between symbolic and sub-symbolic domains and deal with structured organization of information, that is typically required by symbolic processing. (c) 2006 Elsevier B.V. All rights reserved.

关键词： multiscale tree representation syntactic shape recognitiom fuzzy neural networks recursive learning

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Self-stabilizing distributed algorithms for networks

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5th international symposium on parallel and distributed Processing and Applications/ISPA 2007 international Workshops

作者： Srimani, Pradip K. Clemson Univ Dept Comp Sci Clemson SC 29631 USA

ISBN: (纸本)9783540747413

Many essential fundamental services for networked distributed systems (ad hoc, wireless or sensor) involve maintaining a global predicate over the entire network (defined by some invariance relation on the global state of the network) by using local knowledge at each of the participating nodes. the participating nodes can no longer keep track of even a small fraction of the knowledge about the global network due to limited storage. We need a new paradigm of localized distributed algorithms, where a node takes simple actions based on local knowledge of only its immediate neighbors and yet the system achieves a global objective. Self-stabilization is a relatively new paradigm for designing such localized distributed algorithms for networks;it is an optimistic way of looking at system fault tolerance and scalable coordination;it provides a cost effective built-in safeguard against transient failures that might corrupt data in a distributed system. We introduce self-stabilizing protocol design with the example of a total dominating set in a network graph and discuss some open problems.

关键词： Fault tolerance

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GiPS: A grid portal for executing Java applications on globus-based grids

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5th international symposium on parallel and distributed Processing and Applications/ISPA 2007 international Workshops

作者： Cardinale, Yudith Figueira, Carlos Univ Simon Bolivar Dept Computac TI Apartado 89000 Caracas 1080A Venezuela

ISBN: (纸本)9783540747413

Grids are becoming the platform of choice for high performance computing. Although grids present a unified view of resources, they need evolved user interfaces in order to fully take advantage of their potential for real applications. Grid portals can deliver complex grid solutions to users;they do so without the need to download or install specialized software, or worrying about setting up networks, firewalls, and port policies. Due to the powerful, general-purpose nature of grid technology, and the nature of the grid resources they expose, the security of portals or points of access to such resources must be carefully considered. In this paper we present GiPS, the SUMA/G Grid Portal, a user-specific portal which allows Java applications to access grid resources for execution. We describe how the portal exploits standard, off-the-shelf commodity software together with existing grid infrastructures in order to facilitate security and data access. the main technologies used by GiPS are GSI, MyProxy, Java CoG Kit, GridSphere, and SUMA/G middleware. In SUMA/G, Java classes and files are loaded on demand from the user's machines. We describe how the SUMA/G Grid Portal supports this execution model and how it allows users to access controlled external data servers (users' local file systems and file systems accessible from their local workstations), under a secure platform.

关键词： grid portals grid computing grid security portal development kit Java execution model

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A generic distributed monitor construct for programming process synchronization in distributed systems

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5th international symposium on parallel and distributed Processing and Applications/ISPA 2007 international Workshops

作者： Cao, Jiannong Wang, Miaomiao Wu, Weigang Wang, Xianbing Chan, Stephen C. F. Hong Kong Polytech Univ Dept Comp Internet & Mobile Comp Lab Kowloon Hong Kong Peoples R China

ISBN: (纸本)9783540747413

the monitor construct has been implemented in several concurrent and/or parallel programming languages for shared-memory system environments, Extensions of the monitor to support process synchronization in distributed systems have also been proposed. But, most existing work only provides the architecture design of the distributed monitor. there is no discussion about the algorithmic and implementation issues. Also, none of them consider how to implement conditional variables. In this paper, we present the design and implementation of a distributed monitor construct, named DisMoniC, for programming process synchronization in distributed systems. DisMoniC is generic in the sense that it can be used with any distributed mutual exclusion (DME) algorithm to implement exclusive access to the monitor operations. Time-efficient algorithms are proposed to implement conditional process synchronization in the distributed monitor. We also present performance evaluation of the proposed construct.

关键词： distributed monitor construct process synchronization distributed systems distributed mutual exclusion

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Grid computing in New York state, USA

Grid computing in New York state, USA

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5th international symposium on parallel and distributed Processing and Applications/ISPA 2007 international Workshops

作者： Bednasz, Jonathan J. Gallo, Steven M. Miller, Russ Ruby, Catherine L. Weeks, Charles M. SUNY Buffalo Ctr Computat Res Buffalo NY 14203 USA SUNY Buffalo Dept Comp Sci & Engn Buffalo NY 14260 USA Hauptman Woodward Med Res Inst Buffalo NY 14203 USA

ISBN: (纸本)9783540747666

We have designed and deployed the New York State Grid (NYS Grid), which consists of an integrated computational and data grid. NYS Grid is used in a ubiquitous fashion, where the users have virtual access to their data sets and applications, allowing the user to perform tasks without knowledge of the physical hosts for data storage or compute systems. A wide variety of applications have been ported to NYS Grid, including critical programs in a variety of fields that are ideally suited to a multiprocessor computing environment with distributed datasets. Two applications from structural biology are presented as exemplars, including our Grid portal version of the SnB program, which has been run simultaneously on all computational resources on NYS Grid, as well as on the majority of the tens of thousands of processors available through the Open Science Grid. this paper also discusses previous grids that we developed, including the Buffalo-based (ACDC) experimental grid and the Western New York Grid, as well as a wide variety of advances that we have made in terms of grid monitoring, predictive scheduling, grid portal design, and grid-enabling application templates, to name a few.

关键词： Grid computing

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