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检索条件"任意字段=18th IASTED International Conference on Parallel and Distributed Computing and Systems"

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How to improve the scalability of an industrial parallel reservoir simulator

How to improve the scalability of an industrial parallel res...

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18th iasted international conference on parallel and distributed computing and systems

作者： Gratien, Jean-Marc Guignon, thomas Magras, Jean-Francois Quandalle, Philippe Ricois, Olivier IFP Energies Nouvelles 1 & 4 Av Bois Preau F-92852 Rueil Malmaison France

ISBN: (纸本)9780889866386

Reservoir Engineering industry is very interested in using ever growing dataset with more and more complex physics and detailed models. the key issue still remains running simulations in an acceptable CPU time. Regarding the trend in hardware technologies, the challenge is to improve the efficiency of reservoir simulation software on a large number of processors. New numerical difficulties and performance problems appear when the number of cells and the number of processors are growing. In this paper, we present different approaches to overcome these kinds of problems. We discuss technical choices such like advanced scalable linear solver algorithm, load balancing issue with different domain decomposition strategies, dynamic space criteria, mesh partitioner strategy and parallel solver performance management, flexible 10 strategy from simple file system to more complex parallel file system or database. We have developed and benchmarked these different solutions on published reference large scale problems and actual case studies with several tens millions of cells. We analyse the results and discuss the efficiency of each solution to overcome the scalability difficulties and performance limitations due to load unbalance.

关键词： cluster reservoir simulation solver parallel IO scalability

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A resource management system for data-intensive applications in desktop grid environments

A resource management system for data-intensive applications...

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18th iasted international conference on parallel and distributed computing and systems

作者： Toyama, Toshiaki Yamada, Yoshito Konishi, Katsumi Kogakuin Univ Grad Sch Informat Dept Comp Sci & Commun Engn Tokyo Japan Tokyo Inst Technol Grad Sch Engn Dept Commun & Integrated Syst Tokyo Japan Kogakuin Univ Fac Informat Dept Comp Sci Tokyo Japan

ISBN: (纸本)9780889866386

Grid computing using idle desktop PCs is popular as a low-cost platform for high-throughput applications. However, they require high-cost data transfer systems from file servers to calculating nodes when very large amounts of data are handled. this high cost derives from inexpensive I/O of worker PCs and small inexpensive file systems of desktop grid computing. this work describes a desktop grid computing system and proposes a resource management system for volume visualization. the resource management system proposed in this work overcomes problems with high-cost data transfer and helps us to use desktop grid computing for data-intensive applications. the resource management system provides efficient scheduling while considering the data file location and consists of three technical parts: resource management, multiple data replication, and worker selection. the proposed system uses these techniques to make an intelligent reuse of data which has been previously copied. this paper evaluates the proposed system compared with a traditional system that does not consider data file location. the proposed resource management System provides efficient scheduling and appears to achieve good performance for data-intensive applications.

关键词： desktop grid computing PC grid resource management data-intensive applications volume visualization parallel visualization

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Lower level architecture of the Sombrero single address space distributed operating system

Lower level architecture of the Sombrero single address spac...

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18th iasted international conference on parallel and distributed computing and systems

作者： Miller, Donald S. White, Donald B. Skousen, Alan C. Tcherepov, Rossen Arizona State Univ Dept Comp Sci & Engn Tempe AZ 85287 USA

ISBN: (纸本)9780889866386

Sombrero is an object-oriented single address space operating system whose virtual address space can be distributed over multiple nodes. this paper presents recent additions to the design and implementation of the lower level architecture of Sombrero. this design exploits Sombrero's object-oriented development model to provide an implementation of a lower-level architecture for the Alpha platform. Software representations of the hardware system's major components have been implemented. the existing middle level architectural modules now use the lower-level services, these include board and processor level hardware interfaces as well as interrupt processing, device driver and protocol component architectures. We contrast differences in the ways these things are designed and operate in a single address space environment with the way they are done in a conventional multiple address space operating system. Features covered include the use of passive servers, simple efficient thread switching and threads blocking within interrupts. Passive and active device drivers are described and the rational for each mode given. the performance of the Sombrero protocol stack was closely examined with attention to its passive service architecture and thread switching method. the current Sombrero Prototype is described.

关键词： single address space operating systems operating systems distributed operating systems object-oriented systems distributed shared memory

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Efficient routing in non-uniform DHTs for range query support

Efficient routing in non-uniform DHTs for range query suppor...

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18th iasted international conference on parallel and distributed computing and systems

作者： Abdallah, Maha Buyukkaya, Eliya Univ Paris 06 LIP6 8 Rue Capitaine Scott F-75015 Paris France

ISBN: (纸本)9780889866386

By randomly mapping items and nodes to a common address space, most P2P index structures based on DHTs provide only exact match data look-ups. this compromises their use in data-oriented applications where more advanced query facilities, such as range queries, are needed. We have previously proposed a P2P index structure that refines the Chord DHT by mapping data items to the Chord address space in an order-preserving way. Load balancing of skewed data is then achieved deterministically by pulling nodes to zones where too many data items reside. However, based on Chord's underlying routing infrastructure, our previous solution can no longer ensure logarithmic routing cost when the node distribution over the address space becomes highly skewed. In this paper, we push our previous study one step further and propose a simple yet efficient refinement to Chord's routing component. By offering nodes more flexibility in the choice of their neighbors, our solution ensures logarithmic routing cost, with high probability. Most importantly, our solution is dynamic in the sense that it adapts to any node distribution, including highly adversarial ones.

关键词： peer-to-peer systems distributed hash tables (DHTs) range queries routing load-balancing

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Power-aware parametric dispatching in distributed real-time systems

Power-aware parametric dispatching in distributed real-time ...

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18th iasted international conference on parallel and distributed computing and systems

作者： Elsharkawy, Sameh M. Younis, Mohamed F. Moulds, Clint Catholic Univ Amer Dept Elect Engn & Comp Sci Washington DC 20064 USA Univ Maryland Baltimore Cty Dept Elect Engn & Comp Sci Baltimore MD 21228 USA

ISBN: (纸本)9780889866386

the majority of battery operated computing devices have the capability to employ Dynamic Voltage Scaling (DVS) as an effective method to minimize the power used by their processors. Algorithms employing DVS in real-time systems must guarantee the satisfaction of all tasks' timing constraints while minimizing power consumption. In this paper, we present a framework for scheduling and dispatching a distributed set of hard real-time tasks with relative timing constraints. In our approach, the scheduler employs the parametric real-time scheduling methodology to provide on-time completion guarantees for periodic hard real-time tasks. Moreover, the scheduler associates with each hard real-time task a feasibility range parameterized by timing parameters generated at run-time. the run-time dispatcher uses this information to calculate the system's dynamic slack time. It uses the slack time to set the CPU speed using DVS in the time interval till the next scheduling point. the dispatcher reclaims the additional slack generated when a job uses fewer execution cycles than its worst-case estimate to further reduce power consumption. the proposed power-aware dispatching method has running-time of O(1) with no need for off-line computations. Our simulation results show significant improvement in power savings over previously presented DVS-based scheduling methods.

关键词： real-time scheduling power management Digital Voltage Scaling distributed systems parametric dispatching

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Design of the SAgent security framework for JADE

Design of the SAgent security framework for JADE

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18th iasted international conference on parallel and distributed computing and systems

作者： Gunupudi, Vandana Tate, Stephen R. Univ North Texas Dept Comp Sci & Engn Denton TX 76203 USA

ISBN: (纸本)9780889866386

In this paper, we present the design of SAgent, a general-purpose mobile agent security framework. SAgent is designed for comprehensive protection of mobile agent computations and data in potentially hostile environments and works with the JADE (Java Agent DEvelopment) platform [1], a FIPA-compliant multi-agent environment. Using good software engineering design techniques of software reusability and abstraction, SAgent allows agent protection protocols and applications to be developed independently of each other. To accomplish this, a clean conceptual framework is presented which encapsulates in several general class interfaces the common security functionality required by secure agent applications. Since SAgent is designed to generically protect the computations of mobile agent applications, we provide implementations of two secure multiagent protocols that protect the confidentiality of agent data as well as implementations of four methods that protect the integrity of mobile agent data. Experimental results showing the feasibility of these methods are available in separate publications [2] [3]. the goal of SAgent is to provide a framework where proposed theoretical techniques can be used and experimentally evaluated. SAgent allows a new security provider to implement and experiment with new techniques for protecting mobile agents in a well-defined manner and is generic enough to support both software-based and hardware-based protections.

关键词： software development software reuse distributed agents mobile agent security frameworks for mobile agents

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Approximating the Buffer Allocation Problem using epochs

Approximating the Buffer Allocation Problem using epochs

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18th iasted international conference on parallel and distributed computing and systems

作者： Pedersen, Jan Baekgaard Brodsky, Alex Univ Nevada Sch Comp Sci 4505 Maryland Pkwy Las Vegas NV 89154 USA Univ Winnipeg Dept Appl Comp Sci Winnipeg MB R3B 2E9 Canada

ISBN: (纸本)9780889866386

the correctness of applications that perform asynchronous message passing typically relies on the underlying hardware having a sufficient amount of memory (message buffers) to hold all undelivered messages-such applications may deadlock when executed on a system with an insufficient number of message buffers. thus, determining the minimum number of buffers that an application needs to prevent deadlock is an important task when writing or porting parallel applications. Unfortunately, both this problem (called the Buffer Allocation Problem) and the simpler problem of determining whether an application may deadlock for a given number of available message buffers are intractable [1]. We present a new epoch-based polynomial-time approach for approximating the Buffer Allocation Problem. Our approach partitions application executions into epochs and intersperses barrier synchronizations between them, thus limiting the number of message buffers necessary to ensure deadlock-freedom. this approach produces near optimal solutions for many common cases and can be adapted to guide application modifications that ensure deadlock freedom when the application is ported. Lastly, we describe a space-time trade-off between the number of available message buffers and the number of barrier synchronizations, and describe how this trade-off can be used to fine-tune application performance.

关键词： resource allocation parallel programming message passing systems

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Repeat analysis in dna sequences with parallel computing method on Grid

Repeat analysis in dna sequences with parallel computing met...

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18th iasted international conference on parallel and distributed computing and systems, PDCS 2006

作者： Arefin, Md. Ahsan Anwar, Abdullah Ibney Wasif, Abu Computer Science and Engineering Bangladesh University of Engineering and Technology Dhaka Bangladesh

the development of Grid environment provides an efficient way for implementing the parallel algorithm. Here we focus on the discovery of short recurring patterns in DNA sequences that represent binding sites for certain proteins in the process of gene regulation. We develop parallel computing algorithm for solving this problem by partitioning the overall DNA sequences. this provides us an option to implement the algorithm on Grid and to evaluate its performance. We use the open source software "Alchemi" for building the Grid environment. Also by using a merging repeat approach to find these patterns, we address other related problems, including finding of repetition with insertion and deletion.

关键词： DNA sequences

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Granularity control for distributed execution of logic programs

Granularity control for distributed execution of logic progr...

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18th international conference on distributed computing systems

作者： Xirogiannis, G Heriot Watt Univ Dept Elect & Comp Engn Edinburgh EH14 4AS Midlothian Scotland

ISBN: (纸本)0780350049

distributed execution of logic programs requires a match of granularity between a program and the distributed multi-processor it runs on to exploit its potential for performance fully. this paper presents methods to control the granularity of tasks on distributed heterogeneous processors effectively. It considers the characteristics of such platforms and relates the amount of local computation with the significant communication overheads by introducing the notion of a collection of parallel tasks. the experimental results indicate that the proposed controls can model all kinds of predicates (reclusive, mutually recursive etc.) satisfactorily and improve the performance of various forms of parallelism (AND, OR, combinations).

关键词： distributed computer systems

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Wide-area Nile: A case study of a wide-area data-parallel application

Wide-area Nile: A case study of a wide-area data-parallel ap...

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18th international conference on distributed computing systems

作者： Amoroso, A Marzullo, K Ricciardi, A Univ Bologna Dipartimento Sci Informaz Bologna Italy

ISBN: (纸本)0780350049

the Nile system is a distributed environment for running very large, data-intensive applications across a network of commodity workstations. these applications process data from elementary particle collisions, generated by the Cornell Electron Storage Ring, and are used by physicists of the CLEO experiment. the applications have a simple data-parallel structure, and so Nile executes them using as much parallelism as is available. Nile currently runs at any single site. It is being used by alpha testers and is scheduled for beta release in March 1998. this paper describes how we are adapting this local-area Nile system to allow for wide-area, multiple site interactions. In particular, we consider the two problems of scaling and of fault-tolerance.

关键词： Wide area networks

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