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检索条件"任意字段=21st International Parallel and Distributed Processing Symposium, IPDPS 2007"

共 234 条记录，以下是31-40 订阅

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Analysis of different future objects update strategies in ProActive

Analysis of different future objects update strategies in Pr...

引用

21st international parallel and distributed processing symposium, ipdps 2007

作者： Ranaldo, Nadia Zimeo, Eugenio Department of Engineering University of Sannio 82100 Benevento Italy Research Centre on Software Technology University of Sannio 82100 Benevento Italy

ISBN: (纸本)1424409101

In large-scale distributed systems, asynchronous communication and future objects are becoming wide spread mechanisms to tolerate high latencies and to improve global performances. Automatic continuation, that is the propagation of a future object outside the activity that has generated it, can be used to further increase concurrency at system level through the anticipation of tasks. An important aspect of automatic continuation, which can cause different performance in different application and deployment scenarios, is the mechanism for updating result values of future objects, when they are ready. In this paper, we analyze the behaviour of the implementation of different updating strategies, by comparing them with the one currently implemented in ProActive. The experimental results show that the lazy home-based strategy behaves better than other strategies in some application scenarios that are very common in distributed applications. © 2007 IEEE.

关键词： distributed computer systems

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A parallel hybrid method of GMRES on GRID system

A parallel hybrid method of GMRES on GRID system

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21st international parallel and distributed processing symposium, ipdps 2007

作者： Zhang, Ye Bergere, Guy Petiton, Serge Laboratoire d'Informatique Fondamentale de Lille USTL Villeneuve D'Ascq 59650 France

ISBN: (纸本)1424409101

Grid computing focuses on making use of a very large amount of resources from a large-scale computing environment. It intends to deliver high-performance computing over distributed platforms for computation and data-intensive applications. In this paper, we will present an effective parallel hybrid asynchronous method to solve large sparse linear systems by the use of a Grid Computing platform Grid5000. This hybrid method combines a parallel GMRES(m) (Generalized Minimum RESidual) algorithm with the Least Square method that needs some eigenvalues obtained from a parallel Arnoldi algorithm. All of these algorithms run on the different processors of the platform Grid5000. Grid5000, a 5000 CPUs nation-wide infrastructure for research in Grid computing, is designed to provide a scientific tool for computing. We discuss the performances of this hybrid method deployed on Grid5000, and compare these performances with those on the IBM SP series supercomputers. © 2007 IEEE.

关键词： parallel processing systems

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Towards threat-adaptive dynamic fragment replication in large scale distributed systems

Towards threat-adaptive dynamic fragment replication in larg...

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21st international parallel and distributed processing symposium, ipdps 2007

作者： Pietro, Roberto Di Mancini, Luigi V. Mei, Alessandro Università di Roma Tre Dipartimento di Matematica l.go S. Leonardo Murialdo 1 00146 - Roma Italy Università di Roma La Sapienza Dipartimento di Informatica via Salaria 113 00198 - Roma Italy

ISBN: (纸本)1424409101

In this paper, we consider new issues in building secure p2p file sharing systems. In particular, we define a powerful adversary model and consequently present the requirements to address when implementing a threat-adaptive secure file sharing system. We describe the main components of such a system: An early warning mechanism to perform pre-emptive actions against new vulnerabilities;a mechanism to sanitize corrupted nodes;a protocol to securely "migrate" data from non-safe nodes;and an efficient dynamic secret sharing mechanism. © 2007 IEEE.

关键词： distributed computer systems

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Prediction services for distributed computing

Prediction services for distributed computing

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21st international parallel and distributed processing symposium, ipdps 2007

作者： Smith, Warren Texas Advanced Computing Center University of Texas Austin

ISBN: (纸本)1424409101

Users of distributed systems such as the TeraGrid and Open Science Grid can execute their applications on many different systems. We wish to help such users, or the grid schedulers they use, select where to run applications by providing predictions of when tasks will complete if sent to different systems. We make predictions of file transfer times, batch scheduler queue wait times, and application execution times using historical information and instance-based learning techniques. Our prediction errors for data from the TACC lonestar system are 37 percent of mean file transfer time, 115 percent for mean queue wait time, and 72 percent of mean execution time. Our approach achieves significantly lower prediction error on other workloads. We have wrapped these prediction techniques with web services, making predictions available to users of distributed systems as well as tools such as resource brokers and metaschedulers. © 2007 IEEE.

关键词： distributed computer systems

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distributed adaptive particle swarm optimizer in dynamic environment

Distributed adaptive particle swarm optimizer in dynamic env...

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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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Tiresias: Black-box failure prediction in distributed systems

Tiresias: Black-box failure prediction in distributed system...

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21st international parallel and distributed processing symposium, ipdps 2007

作者： Williams, Andrew W. Pertet, Soila M. Narasimhan, Priya Electrical and Computer Engineering Department Carnegie Mellon University 5000 Forbes Avenue Pittsburgh PA 15213-3890

ISBN: (纸本)1424409101

Faults in distributed systems can result in errors that manifest in several ways, potentially even in parts of the system that are not collocated with the root cause. These manifestations often appear as deviations (or "errors") in performance metrics. By transparently gathering, and then identifying escalating anomalous behavior in, various node-level and system-level performance metrics, the Tiresias system makes black-box failure-prediction possible. Through the trend analysis of performance metrics, Tiresias provides a window of opportunity (look-ahead time) for system recovery prior to impending crash failures. We empirically validate the heuristic rules of the Tiresias system by analyzing fault-free and faulty performance data from a replicated middleware-based system. © 2007 IEEE.

关键词： distributed computer systems

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Modeling of NAMD's network input/output on large PC clusters

Modeling of NAMD's network input/output on large PC clusters

引用

21st international parallel and distributed processing symposium, ipdps 2007

作者： Tran, Nancy Reed, Daniel A. University of North Carolina Dept. of Pathology and Laboratory Medicine Chapel Hill NC 27599 United States University of North Carolina Renaissance Computing Institute Chapel Hill NC 27599 United States

ISBN: (纸本)1424409101

This study examined the interplay among processor speed, cluster interconnect and file I/O, using parallel, applications to quantify interactions. We focused on a common case where multiple compute nodes communicate with a single master node for file accesses. We constructed a predictive model that used time characteristics critical for application performance to estimate the number of nodes beyond which further performance improvement became unattainable. Predictions were experimentally validated with NAMD [12, 14], a representative parallel application designed for molecular dynamics simulation. Such predictions can help guide decision making to improve machine allocations for parallel codes in large clusters. © 2007 IEEE.

关键词： parallel processing systems

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Dynamic multi-user load balancing in distributed systems

Dynamic multi-user load balancing in distributed systems

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21st international parallel and distributed processing symposium, ipdps 2007

作者： Penmatsa, Satish Chronopoulos, Anthony T. University of Texas at San Antonio Dept. of Computer Science One UTSA Circle San Antonio TX 78249 United States IEEE

ISBN: (纸本)1424409101

In this paper, we review two existing static load balancing schemes based on M/M/1 queues. We then use these schemes to propose two dynamic load balancing schemes for multi-user (multi-class) jobs in heterogeneous distributed systems. These two dynamic load balancing schemes differ in their objective. One tries to minimize the expected response time of the entire system while the other tries to minimize the expected response time of the individual users. The performance of the dynamic schemes is compared with that of the static schemes using simulations with various loads and parameters. The results show that, at low communication overheads, the dynamic schemes show superior performance over the static schemes. But as the overheads increase, the dynamic schemes (as expected) yield similar performance to that of the static schemes. © 2007 IEEE.

关键词： Resource allocation

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C++ based system synthesis of real-time video processing systems targeting FPGA implementation

C++ based system synthesis of real-time video processing sys...

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21st international parallel and distributed processing symposium, ipdps 2007

作者： Lawal, Najeem O'Nils, Mattias Thörnberg, Benny Mid Sweden University Dept. of Information Technology and Media SE-851 70 Sundsvall Sweden

ISBN: (纸本)1424409101

Implementing real-time video processing systems put high requirements on computation and memory performance. FPGAs have proven to be effective implementation architecture for these systems. However, the hardware based design flow for FPGAs make the implementation task complex. The system synthesis tool presented in this paper reduces this design complexity. The synthesis is done from a SystemC based coarse grain dataflow graph that captures the video processing system. The data flow graph is optimized and mapped onto an FPGA. The results from real-life video processing systems clearly show that the presented tool produces effective implementations. © 2007 IEEE.

关键词： Video signal processing

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Automatic MPI application transformation with ASPhALT

Automatic MPI application transformation with ASPhALT

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21st international parallel and distributed processing symposium, ipdps 2007

作者： Danalis, Anthony Pollock, Lori Swany, Martin University of Delaware Department of Computer and Information Sciences Newark DE 19716 United States

ISBN: (纸本)1424409101

This paper describes a source to source compilation tool for optimizing MPI-based parallel applications. This tool is able to automatically apply a "prepushing" transformation that causes MPI programs to aggressively send data as soon as it is available, thus improving communication-computation overlap and improving application performance. In this paper we present asphalt_transformer;the Open64-based component of our framework, ASPhALT, responsible for automatically performing the prepushing transformation. We also present an extensive study of the performance gains witnessed from automatically transformed codes. In particular, we demonstrate how different levels of aggregation affect the performance of parallel programs executing various computation kernels on different clusters. Furthermore, we discuss the differences in performance improvement between the hand-optimized and automatically optimized codes, as well as the effect of automation on time-to-solution. © 2007 IEEE.

关键词： parallel processing systems

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