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distributed adaptive particle swarm optimizer in dynamic environment

Distributed adaptive particle swarm optimizer in dynamic env...

引用

21st international parallel and distributed Processing symposium, IPDPS 2007

作者： Cui, Xiaohui Potok, Thomas E. Applied Software Engineering Research Computational Sciences and Engineering Division Oak Ridge National Laboratory Oak Ridge TN 37831-6085

ISBN: (纸本)1424409101

Particle Swarm Optimization (PSO) is a population-based stochastic optimization technique, which can be used to find an optimal, or near optimal, solution to a numerical and qualitative problem. In PSO algorithm, the problem solution emerges from the interactions among many simple individual agents called particles. In the real world, we have to frequently deal with searching and tracking an optimal solution in a dynamical and noisy environment. This demands that the algorithm not only find the optimal solution but also track the trajectory of the non-stationary solution. The traditional PSO algorithm lacks the ability to track the changing optimal solution in a dynamic and noisy environment. In this paper, we present a distributed adaptive PSO (DAPSO) algorithm that can be used to track a non-stationary optimal solution in a dynamically changing and noisy environment. © 2007 IEEE.

关键词： Dynamical systems

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Making peer-to-peer anonymous routing resilient to failures

Making peer-to-peer anonymous routing resilient to failures

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21st international parallel and distributed Processing symposium, IPDPS 2007

作者： Zhu, Yingwu Hu, Yiming Department of CSSE Seattle University Seattle WA 98122 Department of ECECS University of Cincinnati Cincinnati OH 45221

ISBN: (纸本)1424409101

One hurdle to using peer-to-peer networks as anonymizing networks is churn. Node churn makes anonymous paths fragile and short-lived: failures of a relay node disrupt the path, resulting in message loss and communication failures. To make anonymous routing resilient to node failures, we take two steps: (1) we use a simple yet powerful idea based on message redundancy by erasure coding and path redundancy to mask node failures;(2) we base mix choices of a path on node lifetime prediction and choose stable nodes as relay nodes, thereby prolonging single path durability. We present an allocation of erasure-coded message segments among multiple paths that provides a guideline on how to maximize routing resilience upon different node availabilities in real-world systems. Via detailed simulations, we compare routing resilience of our approach and existing anonymity protocols, showing that our approach greatly improves routing resilience while consuming modest bandwidth. © 2007 IEEE.

关键词： distributed computer systems

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Effects of replica placement algorithms on performance of structured overlay networks

Effects of replica placement algorithms on performance of st...

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21st international parallel and distributed Processing symposium, IPDPS 2007

作者： Alqaralleh, Bassam A. Wang, Chen Zhou, Bing Bing Zomaya, Albert Y. School of Information Technologies University of Sydney NSW 2006 Australia

ISBN: (纸本)1424409101

In DHT-based P2P systems, Replication-based content distribution and load balancing strategies consists of such decisions as which files should be replicated, how many replicas should be created and where to replicate them in order increase the system performance in the presence of non-uniform data and access distribution. There are many works on replica placement policies;however, the impact of system workload on different replica placement strategies is not well studied. We investigate this problem under the context of content addressable overlay networks. We compare a trace based replica placement algorithm with two of its variations, namely random placement and priority based placement under different workloads. Our experimental results show that the effect of replica placement policy is highly affected by the workload of the system, which indicates that an adaptive replica placement strategy is desirable for content distribution in an overlay network. © 2007 IEEE.

关键词： distributed computer systems

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Dependability modeling and analysis in dynamic systems

Dependability modeling and analysis in dynamic systems

引用

21st international parallel and distributed Processing symposium, IPDPS 2007

作者： DiStefano, Salvatore Puliafito, Antonio University of Messina Engineering Faculty Contrada di Dio S. Agata 98166 Messina Italy

ISBN: (纸本)1424409101

Dependability evaluation is an important, often indispensable, step in (critical) systems design and analysis processes. The introduction of control and/or computing systems to automate processes increases the overall system complexity and therefore has an impact in terms of dependability. When a system grows, dynamic effects, not present or manifested before, could arise or become significant in terms of reliability/availability: the system could be affected by common cause failures, the system components could interfere, effects due to load sharing arise and therefore should be considered. Moreover it is of interest to evaluate redundancy and maintenance policies. In those cases it is not possible to recur to notations as reliability block diagrams (RBD), fault trees (FT) or reliability graphs (RG) to represent the system, since the statistical independence assumption is not satisfied. Also more enhanced formalisms as dynamic FT (DFT) could result not adequate to the goal. To overcome those problems we developed a new formalism derived from RBD: the dynamic RBD (DRBD). In this paper we explain how to use the DRBD notation in system modeling and analysis, coming inside a methodology that, starting from the system structure, drives to the overall system availability evaluation following modeling and analysis phases. To do this we use an example drawn from literature consisting of a multiprocessor distributed computing system, also comparing our approach with the DFT one. ©2007 IEEE.

关键词： distributed computer systems

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Key-attributes based optimistic data consistency maintenance method

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

作者： Zhou, Jing Wang, Yijie Li, Sikun Natl Univ Def Technol Inst Comp Natl Key Lab Parallel & Distributed Proc Changsha 410073 Peoples R China

ISBN: (纸本)9783540747413

Peer-to-peer distributed storage systems usually replicate data objects on multi-node to improve the performance and availability. However, updates may be delayed for P2P systems are generally large-scale and strong distributed, and then the performance of resource location in Internet would be depressed. According to that, an optimistic data consistency maintenance method based on key-attributes is proposed. In the method, updates about key-attributes are separated from user request. Key-updates are propagated by latency-overlay update propagation model, that is, updates are always propagated to nodes having maximum or minimal latency, and assured and uncertain propagation paths of updates are all taken into account. Based on classifying key-update conflicts, a double-level reconciling mechanism including the preprocessing of buffer and the processing of update-log is applied to detect and reconcile conflicts, and then conflicts are solved by policies of last-writer-win and divide-and-rule. Lastly, the technique of managing and maintaining update-log is discussed for the above is deployed based on the information storied in update-log. Delaying key-attributes updates cannot occur by the optimistic disposal method, and then it cannot depress efficiency of resource location based on key-attributes, which adapts well to P2P systems in Internet. The simulation results show it is an effective optimistic consistency maintenance method, achieves good consistency overhead, resource location and access overhead, and has strong robustness.

关键词： Location

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distributed resource selection in grid using decision theory 07

Distributed resource selection in grid using decision theory

引用

7th IEEE international symposium on Cluster Computing and the Grid

作者： Nassif, Lilian Noronha Nogueira, Jose Marcos de Andrade, Flavio Vinicius Univ Fed Minas Gerais Belo Horizonte MG Brazil

ISBN: (纸本)9780769528335

Grid technology allows resource sharing among several entities, but selecting the best resource to run a specific job remains one of its main problems. The challenges for the best resource selection involve analysis of several factors such as prediction time to run a job, access restriction to resources, and cost to use resources. This paper presents a resource selection model using decision theory for combining these influential factors in the resource selection process. The model is based on a multi-attribute utility function that maximizes the user preference. This model forms part of a multi-agent system deploying distributed and parallel processing for job execution prediction, access policy verification, and resource selection models. All models of this paper were verified through experiments using real machines. They have presented appropriate functional behaviors and positive performance results.

关键词： Decision theory Predictive models Multiagent systems Costs Uncertainty Resource management Diversity reception Error probability parallel processing Middleware

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Optimization and evaluation of parallel I/O in BIPS3D parallel irregular application

Optimization and evaluation of parallel I/O in BIPS3D parall...

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21st international parallel and distributed Processing symposium, IPDPS 2007

作者： Filgueira, Rosa Singh, David E. Isaila, Florin Carretero, Jesús Loureiro, Antonio García Departement of Computer Science University Carlos III of Madrid Spain Department of Electronics and Computer Science Universidad de Santiago de Compostela Spain

ISBN: (纸本)1424409101

This paper presents the optimization and evaluation of parallel I/O for the BIPS3D parallel irregular application, a 3-dimensional simulation of BJT and HBT bipolar devices. The parallel version of BIPS3D employs Metis, a library for partitioning graphs, finite element meshes, or sparse matrices. First, we show how the partitioning information provided by Metis can be used in order to improve the performance of parallel I/O. Second, we propose a novel technique, called Interval Data Grouping (IDG), which exploits the data replication of mesh nodes for optimizing the scheduling of the parallel file operations. Finally, we evaluate the parallel I/O version of BIPS3D for various existing parallel I/O techniques and present an in-depth analysis of the IDG performance. © 2007 IEEE.

关键词： parallel processing systems

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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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Pipelining tradeoffs of massively parallel SuperCISC hardware functions

Pipelining tradeoffs of massively parallel SuperCISC hardwar...

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21st international parallel and distributed Processing symposium, IPDPS 2007

作者： Ihrig, Colin J. Stander, Justin Jones, Alex K. University of Pittsburgh Dept. of Electrical and Computer Engineering Pittsburgh PA 15261 United States

ISBN: (纸本)1424409101

parallel processing using multiple processors is a well-established technique to accelerate many different classes of applications. However, as the density of chips increases, another technique to accelerate these applications is the use of application specific hardware processing blocks in parallel within a chip. SuperCISC hardware blocks utilize this method to accelerate scientific, signal, and image processing applications. By applying pipelining methodologies to SuperCISC functions, the effective amount of parallelism already present can be further increased. Automated register placement within a combinational dataflow graph (DFG) is governed by the desired maximum operating frequency provided as a parameter to the tool flow, as well as the results of static timing analysis of the circuit. Results presented include the design tradeoffs between increased performance, area, and energy. Additionally, benefits of pipelining compared to hardware replication as a means of achieving further parallelism is studied. © 2007 IEEE.

关键词： parallel processing systems

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Locality-aware consistency maintenance for heterogeneous P2P systems

Locality-aware consistency maintenance for heterogeneous P2P...

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21st international parallel and distributed Processing symposium, IPDPS 2007

作者： Li, Zhenyu Xie, Gaogang Li, Zhongcheng Institute of Computing Technology Chinese Academy of Sciences Beijing 100080 China Graduate School Chinese Academy of Sciences Beijing 100080 China INRIA-Rocquencourt Domaine de Voluceau 78153 Le Chesnay France

ISBN: (纸本)1424409101

Replication and caching have been deployed widely in current P2P systems. In update-allowed P2P systems, a consistency maintenance mechanism is strongly demanded. Several solutions have been proposed to maintain the consistency of P2P systems. However, they either use too much redundant update messages, or ignore the heterogeneity nature of P2P systems. Moreover, they propagate updated contents on a locality-ignorant structure, which could consume unnecessary backbone bandwidth and delay the convergence of consistency maintenance. This paper presents a locality-aware consistency maintenance scheme for heterogeneous P2P systems. Taking the heterogeneity nature, we form the replica nodes into a locality-aware hierarchical structure: the upper layer is DHT-based and a node in the lower layer attaches to a physically close node in the upper layer. An efficient update tree is built dynamically upon the upper layer to propagate the updated contents. Theoretical analyses and simulation results demonstrate the effectiveness of our scheme. Specially, experiment results show that, compared with gossip-based scheme, our approach reduces the cost by about one order of magnitude. © 2007 IEEE.

关键词： distributed computer systems

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