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1st Workshop on Workload Characterization, WWC 1998

作者： Conte, M.T. Trick, A.R. Gyllenhaal, J.C. Hwu, W.W. Department of Electrical and Computer Engineering Coordinated Science Laboratory Center for Reliable and High-performance Computing University of Illinois at Urbana-Champaign United States

ISBN: (纸本)0769504507

Presents a detailed characterization of Java application and applet workloads in terms of reuse and sharing of Java code at the program, class and method level. In order to expose more sharing opportunities, techniques for detecting code equivalence even in the presence of minor code changes or constant pool index differences) are also proposed and examined. The analyzed application workload consists of the recently released SPECjvm98 benchmarks, and the applet workload is derived from three extensive searches of the Internet between May 1997 and May 1998 using an enhanced Web crawler. Analysis of these workloads reveals several new code sharing and optimization opportunities. © 1998 IEEE.

关键词： Java programming language

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Efficient all-to-all personalized exchange in multidimensional torus networks

Efficient all-to-all personalized exchange in multidimension...

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International Conference on Parallel Processing (ICPP)

作者： Young-Joo Suh K.G. Shin Department of Computer Science and Engineering Pohang University of Science and Technology Pohang South Korea Real-Time Computing Laboratory Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA

This paper presents new algorithms for all-to-all personalized exchange in multidimensional torus-connected multiprocessors. Unlike existing message-combining algorithms in which the number of nodes in each dimension should be power-of-two and square, the proposed algorithms accommodate non-power-of-two tori where the number of nodes in each dimension need not be power-of-two. In addition, destinations remain fixed over a larger number of steps in the proposed algorithms, thus making them amenable to optimizations. Finally, the data structures used are simple, hence making substantial saving of message-rearrangement time.

关键词： Intelligent networks Multidimensional systems Samarium computer science Propagation delay Scattering computer networks Laboratories Communication switching Data structures

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Nonlinear feedback control and observer design for the modern effusion cell

Nonlinear feedback control and observer design for the moder...

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IEEE Conference on Decision and Control

作者： M.K. Tucker D.G. Meyer Nonlinear and Real-Time Control Laboratory Department of Electrical and Computer Engineering University of Colorado Boulder CO USA

In the molecular-beam epitaxy (MBE) process precise control over thickness, composition, and doping profiles are critical for end device performance. This paper addresses the problem of accurately controlling the flux sources (effusion cells) used in MBE. We present a nonlinear compensator based on exact input-output linearization via feedback to control the flux of an effusion cell. The unmeasured states, necessary for implementation of the controller, are estimated by a Kalman-Bucy observer. We present simulations of the composite observer/nonlinear controller system, showing successful flux command following and elimination of shutter induced flux transients.

关键词： Feedback control Molecular beam epitaxial growth Observers Process control Thickness control Doping profiles Linear feedback control systems State estimation Control system synthesis Nonlinear control systems

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Nonlinear invariance: Cross-positive vector fields

Nonlinear invariance: Cross-positive vector fields

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1998 American Control Conference, ACC 1998

作者： Meyer, David G. Piatt, Teri L. Wadley, Haydn N.G. Vancheeswaran, Ravi Kosut, Robert Nonlinear and Real-Time Control Laboratory Electrical and Computer Engineering Department University of Colorado Boulder CO 80309-0425 United States Intelligent Processing of Materials Laboratory Materials Science and Engineering Department University of Virginia Charlottesville VA 22901 United States SC Solutions Inc. 3211 Scott Blvd. Santa Clara CA 95054 United States

ISBN: (纸本)0780345304

This paper introduces the concept of cross-positivity for vector fields and explores ramifications of cross-positivity relative to solutions of ordinary differential equations. The motivation is to understand the dynamic behavior of systems where the natural physics place constraints on the vector field. Our results extend to nonlinear systems several well-known results about properties of x = Ax when A satisfies special conditions. © 1998 AACC.

关键词： Ordinary differential equations

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Evaluation of fault-tolerance latency from real-time application's perspectives

Evaluation of fault-tolerance latency from real-time applica...

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IEEE Conference on Aerospace

作者： Hagbae Kim K.G. Shin Department of Electrical Engineering Yonsei University Seoul South Korea Real-Time Computing Laboratory Department of Electrical Engineering and Comput. Sci University of Michigan Ann Arbor MI USA

Information on Fault-Tolerance Latency (FTL), which is defined as the total time required by all sequential steps taken to recover from an error, is important to the design and evaluation of fault-tolerant computers used in safety-critical real-time control systems with deadline information. In this paper we evaluate FTL in terms of several random and deterministic variables accounting for fault behaviors and/or the capability and performance of error-handling mechanisms, while considering various fault-tolerance mechanisms based on the tradeoff between temporal and spatial redundancy, and use the evaluated FTL to check if an error-handling policy can meet the Control System Deadline (CSD) for a given real-time application.

关键词： Fault tolerance Delay Fault tolerant systems Redundancy Fault detection Control systems computer errors real time systems Application software Process control

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Non-Preemptive Scheduling to Maximize the Minimum Global Inter-Completion time (MGICT) 1

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IFAC Proceedings Volumes 1998年第14期31卷 135-140页

作者： Carlos C. Amaro Sanjoy K. Baruah Alexander D. Stoyen Wolfgang A. Halang Dependable Real- Time Systems Laboratory Department of Computer & Information Science New Jersey Institute of Technology University Heights Newark NJ 07102 USA Department of Computer Science The University of Vermont Burlington VT 05405 Faculty of Electrical Engineering Fernuniversität 58084 Hagen Germany

Temporal load-balancing - "spreading out" the executions of tasks over time - is desirable in many applications. A form of temporal load-balancing is discussed: scheduling to maximize minimum global inter-completion time (MGICT-scheduling). It is shown that MGICT-scheduling is, in general, NP-hard. A number of restricted classes of task systems are identified, which can be efficiently MGICT-scheduled.

关键词： non-preemptive scheduling independent tasks multiple processors loadbalancing

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Reliability modeling of hard real-time systems

Reliability modeling of hard real-time systems

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International Symposium on Fault-Tolerant computing (FTCS)

作者： H. Kim A.L. White K.G. Shin Department of Electrical Engineering Yonsei University Seoul South Korea NASA LaRC Hampton VA USA Real-Time Computing Laboratory Department of Electrical Engineering and Comput. Sci University of Michigan Ann Arbor MI USA

A hard real-time control system, such as a fly-by-wire system, fails catastrophically (e.g., lose stability) if its control input is not updated by its digital controller computer within a certain time limit called the hard deadline. To assess and validate system reliability by using a semi-Markov model that explicitly contains the deadline information, we propose a path-space approach deriving the upper and lower bounds of the probability of system failure. These bounds are derived by using only simple parameters, and they are especially suitable for highly-reliable systems which must recover quickly. Analytical bounds are derived for both exponential and Weibull failure distributions, which have proven effective through numerical examples, while considering three repair strategies: repair-as-good-as-new, repair-as-good-as-old, and repair-better-than-old.

关键词： real time systems Control systems Timing Reliability Postal services NASA Stability Digital control Failure analysis Electromagnetic measurements

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An efficient group communication architecture over ATM networks

An efficient group communication architecture over ATM netwo...

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Heterogeneous computing Workshop

作者： Sung-Yong Park Joohan Lee S. Hariri High Performance Distributed Computing Laboratory Department of Electrical Engineering and Computer Science Syracuse University Syracuse NY USA

NYNET (ATM wide-area network testbed in New York state) Communication System (NCS) is a multithreaded message-passing tool developed at Syracuse University that provides low-latency and high-throughput communication services over Asynchronous Transfer Mode (ATM)-based high-performance distributed computing (HPDC) environments. NCS provides flexible and scalable group communication services based on dynamic grouping and tree-based multicasting. The NCS architecture, which separates the data and control functions, allows group operations to be implemented efficiently by utilizing the control connections when transferring status information (e.g. topology information, routing information). Furthermore, NCS provides several different algorithms for group communication and allows programmers to select an appropriate algorithm at runtime. The authors overview the general architecture of NCS and present the multicasting services provided by NCS. They analyze and compare the performance of NCS with that of other message-passing tools such as p4, PVM, and MPI in terms of primitive performance and performance.

关键词： Asynchronous transfer mode computer architecture Communication system control Multicast algorithms System testing Distributed computing Topology Routing Programming profession Runtime

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A multithreaded message-passing system for high performance distributed computing applications

A multithreaded message-passing system for high performance ...

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International Conference on Distributed computing Systems

作者： S.-Y. Park J. Lee S. Hariri High Performance Distributed Computing (HPDC) Laboratory Department of Electrical Engineering and Computer Science High Performance Distributed Computing HPDC Laboratory Syracuse University Syracuse NY USA

NYNET (ATM wide area network testbed in New York state) Communication System (NCS) is a multithreaded message passing system developed at Syracase University that provides high performance and flexible communication services over asynchronous transfer mode (ATM) based high performance distributed computing (HPDC) environments. NCS capitalizes on thread based programming model to overlap computations and communications, and develop a dynamic message passing environment with separate data and control paths. This leads to a flexible and adaptive message passing environment that can support multiple flow control, error control, and multicasting algorithms. We provide an overview of the NCS architecture and present how NCS point to point communication services are implemented. We also analyze the overhead incurred by using multithreading and compare the performance of NCS point to point communication primitives with those of other message passing systems such as p4, PVM, and MPI. Benchmarking results indicate that NCS shows comparable performance to other systems for small message sizes but outperforms other systems for large message sizes.

关键词： Message passing Asynchronous transfer mode Dynamic programming Communication system control Wide area networks System testing Distributed computing Yarn Computational modeling Programmable control

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Soft computing, fuzzy logic and recognition technology

Soft computing, fuzzy logic and recognition technology

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IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： L.A. Zadeh Berkeley Initiative in Soft Computing (BISC) Computer Science Division and the Electronics Research Laboratory Department of Electrical Engineering and Computer Science University of California Berkeley CA USA

Recognition systems of one kind or another have been around for a long time. But what we are beginning to see today are recognition systems that are capable of performing tasks that could not be done in the past. The quantum jump in the capabilities of today's recognition systems reflect three converging developments: (a) major advances in sensor technology; (b) major advances in sensor data processing technology; and (c) the use of soft computing techniques to infer a conclusion from observed data.

关键词： Fuzzy logic Laboratories computer science Character recognition Handwriting recognition Pattern recognition Speech recognition Target recognition Authentication Unsolicited electronic mail

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