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检索条件"机构=High-Performance Computing Laboratory Department of Computer Science"

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Effectiveness of MPI in Java

Effectiveness of MPI in Java

引用

第三届运筹学及其应用国际研讨会

作者： Gilbert H.F.Young Lai-man Wan Vincent S.Yiu Department of Computing Hong Kong Polytechnic University High Performance Computing Laboratory Department of Computer Science & Engineering The Chinese University of Hong Kong

The proliferation of the high-speed network and powerful workstation has narrowed the performance gap between workstation clusters and *** draws significant attention of using Network of Workstations(NOW) environment as parallel computing platform. Message Passing Interface(MPI) has been proposed as a standard for interprocess communication in message-passing parallel ***, it has language bindings for C,C++ and *** the Java technology appears to be able to unify the exist heterogeneous environment into one,we have implemented MPI in Java to exploit its usage in parallel computing *** this paper,we discuss the effectiveness of implementing MPI using *** also present some experimental results of our system called Java Message Passing Interface(JMPI).

关键词： Effectiveness of MPI in Java MPI

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Parallel Extended Kalman Filter Approach for Neural Network Learning and Data Cleaning

Parallel Extended Kalman Filter Approach for Neural Network ...

引用

第三届运筹学及其应用国际研讨会

作者： Wing-kay Kan Gilbert H.Young John Sum High Performance Computing Laboratory Department of Computer Science and Engineering Chinese University of Hong Kong Department of Computing Hong Kong Polytechnic University

In this paper,an extended Kalman filter（EKF） based training and data cleaning algorithm for neural network which can simultaneously train a neural network with good generalization and recover the original data from noise will be *** with the standard recursive least square（RLS） training approach,it is demonstrated that the proposed algorithm can have a better generalization *** also present in this paper a parallel algorithm for the implementation of this EKF based training method onto a SIMD *** a n processors SIMD machine together with this parallel algorithm,the time required for one-step update can be reduced by an order of n,where n is the total number of hidden units,compared with using single sequential machine.

关键词： Gaussian Kalman Parallel Extended Kalman Filter Approach for Neural Network Learning and Data Cleaning Filter

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An efficient group communication architecture over ATM networks

An efficient group communication architecture over ATM netwo...

引用

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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New approaches to spaceborne computing

New approaches to spaceborne computing

引用

1998 IEEE Aerospace Conference, AERO 1998

作者： Sterling, Thomas Kogge, Peter High Performance Computing Systems Group Jet Propulsion Laboratory Mail Stop 168-522 4800 Oak Grove Dr. PasadenaCA91109 United States Department of Computer Science and Engineering University of Notre Dame Notre DameIN46556 United States

ISBN: (纸本)0780343115

NASA's aggressive plans for extensive deep space exploration with a new generation of unmanned space craft requires a dramatic increase in responsibilities for onboard computing to reduce size, weight, and power to drastically reduce mission costs. No longer will all raw sensor data be transmitted back to Earth but rather only the results from extensive preprocessing to decrease total link capacity by one to three orders of magnitude. A new approach to on board data processing is necessitated by this new expanded mission requirement. Processor-In-Memory (PIM) architecture combines logic and memory on the same integrated circuit to permit direct access to memory row buffers, greatly increasing effective memory bandwidth, reducing overhead and latency, and improving power efficiency. Organizing and managing the resources of PIM based systems is challenging. The PIM-MT architecture is an innovative approach to harnessing the physical resources of PIM technology through a message driven multithreaded virtual execution model. This paper describes the concepts of PIM-MT and its role in future spaceborne computing. © 1998 IEEE.

关键词： NASA

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State-space support for path-based reward variables

State-space support for path-based reward variables

引用

International computer performance and Dependability Symposium

作者： W.D. Obal W.H. Sanders Center for Reliable and High-Performance Computing Department of Electrical and Computer Engineering Coordinated Science Laboratory University of Illinois Urbana-Champaign Urbana-Champaign IL USA

Many sophisticated formalisms exist for specifying complex system behaviors, but methods for specifying performance and dependability variables have remained quite primitive. To cope with this problem, modelers often must augment system models with extra state information and event types to support particular variables. This often leads to models that are non-intuitive, and must be changed to support different variables. To address this problem, we extend the array of performance measures that may be derived from a given system model by developing new performance measure specification and model construction techniques. Specifically, we introduce a class of path-based reward variables, and show how various performance measures may be specified using these variables. Path-based reward variables extend the previous work with reward structures to allow rewards to be accumulated based on sequences of states and transitions. To maintain the relevant history, we introduce the concept of a path automaton, whose state transitions are based on the system model state and transitions. Furthermore, we present a new procedure for constructing state spaces and the associated transition rate matrices that support path-based reward variables. Our new procedure takes advantage of the path automaton to allow a single system model to be used as the basis of multiple performance measures that would otherwise require separate models or a single more complicated model.

关键词： Automata Stochastic processes Indium tin oxide Electronic switching systems Read only memory State-space methods Contracts

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New approaches to spaceborne computing

New approaches to spaceborne computing

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IEEE Conference on Aerospace

作者： T. Sterling P. Kogge Jet Propulsion Laboratory High Performance Computing Systems Group Pasadena CA USA Department of Computer Science and Engineering University of Notre Dame Notre Dame IN USA

关键词： Space exploration Power generation Space missions Costs Capacitive sensors Earth Data processing Logic circuits Bandwidth Delay

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Analyzing performance of cache server hierarchies

Analyzing performance of cache server hierarchies

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computer science Society (SCCC) International Conference Chilean FLAGGED

作者： W. Meira E. Fonseca C. Murta V. Almeida Department of Computer Science UFMG Computing Systems Performance Analysis and Modeling Laboratory Belo Horizonte Minas Gerais Brazil

Although caching and the creation of cache server hierarchies has became a popular strategy for reducing user waiting time and network traffic, there is no recipe for determining the best hierarchy configuration given a set of machines and the workload that they have to serve. The paper presents a novel approach for analyzing the performance of cache proxy hierarchies that is based on two metrics: hierarchical hit ratio and cache efficiency. This approach allows users to easily quantify trade-offs among configurations, facilitating the tuning of cache hierarchies. The authors illustrate their approach by analyzing possible configurations for a proxy server.

关键词： performance analysis Network servers World Wide Web Web server Costs Delay Spine Internet Communication channels Electrical capacitance tomography

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Parallel algorithms for simultaneous scheduling, binding and floorplanning in high-level synthesis

Parallel algorithms for simultaneous scheduling, binding and...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： P. Prabhakaran P. Banerjee Center for Reliable and High-Performance Computing Coordinated Science Laboratory University of Illinois Urbana-Champaign IL USA Center for Parallel and Distributed Computing Department of Electrical and Computer Engineering Northwestern University Evanston IL USA

With small device features in submicron technologies, interconnection delays play a dominant part in cycle time. Hence, it is important to consider the impact of physical design during high level synthesis. In comparison to a traditional approach which separates high-level synthesis from physical design, an algorithm which is able to make these stages interact very closely, would result in solutions with lower latency and area. However, such an approach could result in increased runtimes. Parallel processing is an attractive way of reducing the runtimes. In this paper, two parallel algorithms for simultaneous scheduling, binding and floorplanning algorithm are presented. A detailed hardware model is considered, taking into account multiplexor and register areas and delays. Experimental results are reported on an IBM SP-2 multicomputer, with close to linear speedups for a set of benchmark circuits.

关键词： Parallel algorithms high level synthesis Runtime Integrated circuit interconnections Delay effects Algorithm design and analysis Parallel processing Scheduling algorithm Hardware Registers

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AQuA: an adaptive architecture that provides dependable distributed objects

AQuA: an adaptive architecture that provides dependable dist...

引用

Reliable Distributed Systems

作者： M. Cukier J. Ren C. Sabnis D. Henke J. Pistole W.H. Sanders D.E. Bakken M.E. Berman D.A. Karr R.E. Schantz Center for Reliable and High-Performance Computing Coordinated Science Laboratory and Electrical and Computer Engineering Department University of Illinois Urbana-Champaign Urbana IL USA BBN Technologies Inc. Cambridge MA USA

Dependable distributed systems are difficult to build. This is particularly true if they have dependability requirements that change during the execution of an application, and are built with commercial off-the-shelf hardware. In that case, fault tolerance must be achieved using middleware software, and mechanisms must be provided to communicate the dependability requirements of a distributed application to the system and to adapt the system's configuration to try to achieve the desired dependability. The AQuA architecture allows distributed applications to request a desired level of availability using the Quality Objects (QuO) framework and includes a dependability manager that attempts to meet requested availability levels by configuring the system in response to outside requests and changes in system resources due to faults. The AQuA architecture uses the QuO runtime to process and invoke availability requests, the Proteus dependability manager to configure the system in response to faults and availability requests, and the Ensemble protocol stack to provide group communication services. Furthermore, a CORBA interface is provided to application objects using the AQuA gateway. The gateway provides a mechanism to translate between process-level communication, as supported by Ensemble, and IIOP messages, understood by Object Request Brokers. Both active and passive replication are supported, and the replication type to use is chosen based on the performance and dependability requirements of particular distributed applications.

关键词： Availability Application software computer architecture Hardware Fault tolerant systems Middleware Communication system software Quality management Resource management Runtime

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Reusable software components for performability tools, and their utilization for web-based configurable tools 10th

Reusable software components for performability tools, and t...

引用

10th International Conference on Modelling Techniques and Tools for computer performance Evaluation, Tools 1998

作者： Van Moorsel, Aad P. A. Huang, Yiqing Distributed Software Research Department Bell Laboratories Research Lucent Technologies 600 Mountain Ave Murray HillNJ07974 United States Center for Reliable and High-Performance Computing Coordinated Science Laboratory University of Illinois at Urbana-Champaign 1308 W. Main St UrbanaIL61801 United States

ISBN: (纸本)3540649492

This paper discusses software reusability strategies for performance and reliability modeling tools. Special emphasis is on web-embedded tools, and the potential interaction between such tools. We present the system analysis tools (SAT) application programming interface, which allows for quickly embedding existing tools in the web, and generally simplifies programming analysis tools by structured reuse. We also introduce the FREUD project, which has as primary aim to establish a single point of access to a variety of web-enabled tools. In addition, FREUD facilitates configurable web tools by allowing a user to select from the registered modeling formalisms, solvers and graphics tools, and by providing glue between the tools through scripting. We will argue that this form of reuse is particularly suitable for performability modeling tools because of their predictable usage pattern. © Springer-Verlag Berlin Heidelberg 1998.

关键词： computer software reusability

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