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检索条件"任意字段=PDSE 2000: International Symposium on Software Engineering for Parallel and Distributed Systems"

共 944 条记录，以下是461-470 订阅

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An Advanced PC-Cluster Based Real-Time Simulator for Power Electronics and Drives

An Advanced PC-Cluster Based Real-Time Simulator for Power E...

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IEEE international symposium on Industrial Electronics (ISIE)

作者： M. O. Faruque Venkata Dinavahi Department of Electrical and Computer Engineering University of Alberta Edmonton AB Canada

This paper presents the development of an advanced PC-cluster based parallel and distributed real-time digital simulator. The simulator is very flexible and scalable, and is built entirely from commodity-off-the-shelf (COTS) hardware and software components. A combination of real-time Linux operating system and an ultra-fast network forms the backbone for the internal communication between the powerful processors of the Xeon-Cluster which works in parallel multi-tasking mode. MATLAB/SIMULINK environment has been used as the model development software. External hardware can be connected through FPGA-based multi-channel digital and analog I/O ports. A 3-level 12-pulse AC drive has been simulated using the real-time simulator and the results are validated against an off-line simulation using PSCAD/EMTDC. Real-time simulation of the entire system has been achieved with a maximum computation time of 5.35 mus on a step-size of 10 mus

关键词： Power electronics Computational modeling Hardware Real time systems Linux Operating systems Spine MATLAB Mathematical model Power system modeling

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Making a case for a Green500 list 06

Making a case for a Green500 list

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international symposium on parallel and distributed Processing (IPDPS)

作者： S. Sharma Chung-Hsing Hsu Wu-chun Feng Advanced Computing Laboratory Los Alamos National Laboratory Los Alamos NM USA Department of Computer Science Virginia Polytechnic Institute and State University Blacksburg VA USA

ISBN: (纸本)9781424400546

For decades now, the notion of "performance" has been synonymous with "speed" (as measured in FLOPS, short for floating-point operations per second). Unfortunately, this particular focus has led to the emergence of supercomputers that consume egregious amounts of electrical power and produce so much heat that extravagant cooling facilities must be constructed to ensure proper operation. In addition, the emphasis on speed as the performance metric has caused other performance metrics to be largely ignored, e.g., reliability, availability, and usability. As a consequence, all of the above has led to an extraordinary increase in the total cost of ownership (TCO) of a supercomputer. Despite the importance of the TOP500 List, we argue that the list makes it much more difficult for the high-performance computing (UPC) community to focus on performance metrics other than speed. Therefore, to raise awareness to other performance metrics of interest, e.g., energy efficiency for improved reliability, we propose a Green500 List and discuss the potential metrics that would be used to rank supercomputing systems on such a list

关键词： Computer aided software engineering Supercomputers Measurement Availability Laboratories Costs Power system reliability Energy efficiency Cooling High performance computing

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A case for exploit-robust and attack-aware protocol RFCs 06

A case for exploit-robust and attack-aware protocol RFCs

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international symposium on parallel and distributed Processing (IPDPS)

作者： V. Pothamsetty P. Mateti Critical Infrastructure Assurance Group Cisco Systems Inc. Austin TX USA Department of Computer Science and Engineering Wright State University Dayton OH USA

ISBN: (纸本)9781424400546

A large number of vulnerabilities occur because protocol implementations failed to anticipate illegal packets. RFCs typically define what constitute "right" packets relevant to the protocol and they specify what the response should be for such packets. They are often ambiguous and remain silent on what the protocol implementation should do for packets which deviate from the specification. Implementers must and, by and large, do faithfully implement an RFC. However, implementers usually take any silence in a specification as "design freedom". Even though the protocol implementers are network specialists, they often are not knowledgeable in network security and cryptography issues, past exploits and common attack techniques that can impact the security of a protocol module, and consequently, the whole system. This paper systematically discusses vulnerabilities that can be attributed to protocol designs, inadequacies of RFCs, and omissions of the protocol implementers. Using specific examples, we point out how ambiguities in protocol RFCs have lead to security vulnerabilities. We correlate various types of security vulnerabilities with the way the RFCs are written. We make a case for such exploit-robust and attack-aware RFCs, and recommend the features for a better RFC, called eRFC (enhanced RFC). We offer advice to RFC writers, implementers and RFC approval bodies. The most effective solution to reducing network security incidents is to fix the RFCs in such a way that the implementers are forced to write an exploit-robust implementation, irrespective of their security knowledge and expertise.

关键词： Computer aided software engineering Security Cryptographic protocols Robustness Computer science Cryptography Silicon compounds Engines Computer crashes Computer networks

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When Jobs Play Nice: The Case For Symbiotic Space-Sharing

When Jobs Play Nice: The Case For Symbiotic Space-Sharing

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international symposium on High Performance distributed Computing

作者： J. Weinberg A. Snavely San Diego Supercomputer Center University of California San Diego La Jolla CA USA

Using a large HPC platform, we investigate the effectiveness of "symbiotic space-sharing", a technique that improves system throughput by executing parallel applications in combinations and configurations that alleviate pressure on shared resources. We demonstrate that relevant benchmarks commonly suffer a 10-60% penalty in runtime efficiency due to memory resource bottlenecks and up to several orders of magnitude for I/O. We show that this penalty can be often mitigated, and sometimes virtually eliminated, by symbiotic space-sharing techniques and deploy a prototype scheduler that leverages these findings to improve system throughput by 20%

关键词： Computer aided software engineering Symbiosis Processor scheduling Throughput Resource management Benchmark testing Supercomputers Runtime Virtual prototyping File systems

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Supporting self-adaptation in streaming data mining applications 06

Supporting self-adaptation in streaming data mining applicat...

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international symposium on parallel and distributed Processing (IPDPS)

作者： Liang Chen G. Agrawal Department of Computer Science and Engineering Ohio State Uinversity Columbus OH USA

ISBN: (纸本)9781424400546

There are many application classes where the users are flexible with respect to the output quality. At the same time, there are other constraints, such as the need for real-time or interactive response, which are more crucial. This paper presents and evaluates a runtime algorithm for supporting adaptive execution for such applications. The particular domain we target is distributed data mining on streaming data. This work has been done in the context of a middleware system called GATES (grid-based adaptive execution on streams) that we have been developing. The self-adaptation algorithm we present and evaluate in this paper has the following characteristics. First, it carefully evaluates the long-term load at each processing stage. It considers different possibilities for the load at a processing stage and its next stages, and decides if the value of an adaptation parameter needs to be modified, and if so, in which direction. To find the ideal new value of an adaptation parameter, it performs a binary search on the specified range of the parameter. To evaluate the self-adaptation algorithm in our middleware, we have implemented two streaming data mining applications. The main observations from our experiments are as follows. First, our algorithm is able to quickly converge to stable values of the adaptation parameter, for different data arrival rates, and independent of the specified initial value. Second, in a dynamic environment, the algorithm is able to adapt the processing rapidly. Finally, in both static and dynamic environments, the algorithm clearly outperforms the algorithm described in our earlier work and an obvious alternative, which is based on linear-updates.

关键词： Data mining Middleware Application software Runtime Streaming media Heuristic algorithms Data visualization Real time systems Computer science Program processors

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Centralized versus distributed schedulers for multiple bag-of-task applications 06

Centralized versus distributed schedulers for multiple bag-o...

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international symposium on parallel and distributed Processing (IPDPS)

作者： O. Beaumont L. Carter J. Ferrante A. Legrand L. Marchal Y. Robert Laboratoire LaBRI CNRS-INRIA France Department of Computer Science and Engineering University of California San Diego USA Laboratoire ID-IMAG CNRS-INRIA Grenoble France Laboratoire LIP CNRS-INRIA École Normale Supérieure de Lyon France

ISBN: (纸本)9781424400546

Multiple applications that execute concurrently on heterogeneous platforms compete for CPU and network resources. In this paper, we consider the problem of scheduling applications to ensure fair and efficient execution on a distributed network of processors. We limit our study to the case where communication is restricted to a tree embedded in the network, and the applications consist of a large number of independent tasks that originate at the tree's root. The tasks of a given application all have the same computation and communication requirements, but these requirements can vary for different applications. Each application is given a weight that quantifies its relative value. The goal of scheduling is to maximize throughput while executing tasks from each application in the same ratio as their weights. We can find the optimal asymptotic rates by solving a linear program that expresses all necessary problem constraints, and we show how to construct a periodic schedule. For single-level trees, the solution is characterized by processing tasks with larger communication-to-computation ratios at children with larger bandwidths. For multi-level trees, this approach requires global knowledge of all application and platform parameters. For large-scale platforms, such global coordination by a centralized scheduler may be unrealistic. Thus, we also investigate decentralized schedulers that use only local information at each participating resource. We assess their performance via simulation, and compare to a centralized solution obtained via linear programming. The best of our decentralized heuristics achieves the same performance on about two-thirds of our test cases, but is far worse in a few cases. While our results are based on simplistic assumptions and do not explore all parameters (such as buffer size), they provide insight into the important question of fairly and optimally co-scheduling heterogeneous applications on heterogeneous grids

关键词： Processor scheduling Application software Throughput Bandwidth Central Processing Unit Computer networks Computer science Large-scale systems Linear programming Testing

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A model-driven performance analysis framework for distributed, performance-sensitive software systems

A model-driven performance analysis framework for distribute...

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

作者： Gokhale, Swapna S. Gokhale, Aniruddha Gray, Jeffrey Dept. of Computer Science and Engineering University of Connecticut Storrs CT United States Dept. of Electrical Engineering and Computer Science Vanderbilt University Nashville TN United States Dept. of Computer and Information Science Univ. of Alabama at Birmingham Birmingham AL United States

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Efficient evaluation of alternatives for assembly of services

Efficient evaluation of alternatives for assembly of service...

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

作者： Barthwal, Nikhil Woodside, Murray Department of Systems and Computer Engineering Carleton University Ottawa Ont. K1S 5B6 Canada

ISBN: (纸本)0769523129

Component Based software engineering (CBSE) provides rapid development using well-tested components with established properties. Performance and other nonfunctional properties can also be analyzed by building models from sub-models, calibrated for the components. Further there can be many choices of components to build systems, which can provide alternatives. The choice can be governed by goal functions which evaluate the predicted performance. This paper describes a systematic approach to find the feasible combinations of alternatives, and to rank them based on predicted performance. It extends the CBML (Component Based Modeling Language) for defining components in layered queuing models for software performance.

关键词： software engineering

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Hardware-software interaction: Preliminary observations

Hardware-software interaction: Preliminary observations

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

作者： Steiner, Neil Athanas, Peter Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA 24061

ISBN: (纸本)0769523129

As computational devices continue to advance, there are reasons to examine their foundations a little more deeply, and to ask whether there may not be something more to be found. The fundamental manner in which hardware and software interact is poorly understood, and yet there is little indication in the literature that this is being discussed or explored. In spite of our technological achievements, we are at a loss to precisely define the boundaries between hardware and software, and to describe the nature of their interface. This paper aims to raise some of the major issues and questions, to propose a hardware-information duality, and to suggest directions in which further research might be pursued.

关键词： parallel processing systems

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Analysis of hardware acceleration in reconfigurable embedded systems

Analysis of hardware acceleration in reconfigurable embedded...

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

作者： Ouellette, Matthew Connors, Dan Xilinx Inc. Electrical and Computer Engineering University of Colorado Boulder

ISBN: (纸本)0769523129

Embedded designers now have the capability of offloading software routines into custom applicationspecific hardware blocks. This paper evaluates a domain-specific design system for configurable computing platforms that combine processors and configurable fabrics. Although the proposed work uses floating-point and communication primitives as the specific domain tasks evaluated, the reconfigurable computing platform and the design challenges addressed will become increasingly common in a number of embedded system environments. This paper explores the added cost of hardware resources, area, and power of moving software library routines into hardware blocks in a configurable embedded system based on the MicroBlaze soft processor.

关键词： Embedded systems

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