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GEMLCA: Running legacy code applications as Grid services

Journal of Grid computing 2005年第1-2期3卷 75-90页

作者： Delaitre, Thierry Kiss, Tamas Goyeneche, Ariel Terstyanszky, Gabor Winter, Stephen Kacsuk, Peter Centre of Parallel Computing University of Westminster London W1W 6UW 115 New Cavendish Street United Kingdom MTA SZTAKI Budapest 1111 Kende u. 13 Hungary

There are many legacy code applications that cannot be run in a Grid environment without significant modification. To avoid re-engineering of legacy code, we developed the Grid Execution Management for Legacy Code Architecture (GEMLCA) that enables deployment of legacy code applications as Grid services. GEMLCA implements a general architecture for deploying legacy applications as Grid services without the need for code re-engineering, or even access to the source files. With GEMLCA, only a user-level understanding is required to run a legacy application from a standard Grid service client. The legacy code runs in its native environment using the GEMLCA resource layer to communicate with the Grid client, thus hiding the legacy nature of the application and presenting it as a Grid service. GEMLCA as a Grid service layer supports submitting jobs, getting their results and status back. The paper introduces the GEMLCA concept, its life cycle, design and implementation. It also presents as an example a legacy simulation code that has been successfully transformed into a Grid service using GEMLCA. © Springer 2005.

关键词： Grid computing Grid Portal Grid service Legacy code OGSA WSRF

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An investigation of feedback guided dynamic scheduling of nested loops

An investigation of feedback guided dynamic scheduling of ne...

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International Conference on parallel Processing Workshops (ICPPW)

作者： D.J. Hancock J.M. Bull R.W. Ford T.L. Freeman Centre for Novel Computing University of Manchester Institute of Science and Technology Manchester UK Edinburgh Parallel Computing Centre University of Edinburgh Edinburgh UK

In previous papers (J.M. Bull, 1998; J.M. Bull et al., 1996; R.W. Ford et al., 1994) feedback guided loop scheduling algorithms have been shown to be very effective for certain loop scheduling problems. In particular they perform well for problems that involve a sequential outer loop and a parallel inner loop, and timing information gathered during one execution of the parallel inner loop can be used to inform the scheduling of the subsequent execution of this loop. The authors consider the extension of these feedback guided scheduling algorithms to the more important case of nested parallel loops, again within a sequential outer loop. We describe three alternative ways of scheduling nested loops; two are based on reducing the nested loops to a single loop and applying one-dimensional techniques; the third addresses the multidimensionality of the nested loops directly.

关键词： Feedback loop Dynamic scheduling Scheduling algorithm Processor scheduling Performance loss parallel processing Timing Concurrent computing Multidimensional systems Pipeline processing

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Non-functional Oriented Dynamic Integration Of Distributed Components

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Electronic Notes in Theoretical Computer Science 2003年第3期68卷 405-418页

作者： Ahmed Saleh George R.R. Justo Stephen C. Winter Centre For Parallel Computing Computing University of Westminster London UK Cap Gemini Ernst & Young London UK Cavendish School of Computer Science University of Westminster London UK

Building distributed systems from scratch is known as one of the most difficult and time consuming process in software engineering. A great deal of progress has been made in the development of middleware and techniques to facilitate the process of distributed systems through integrating reusable components and customizing middleware. However, most of these solutions tend to focus on the functional aspects of the components and how to adapt their behavior according to their needs. Although the non-functional properties of the services are equally important, because of the difficulties in representing and controlling them, they are usually neglected. This paper investigates the problem of distributed systems' non-functional properties and describes a framework that presents a solution to the problem. The framework is based on the idea of defining the non-functional properties of the services at the early stages of the design and incorporating such properties within the architecture to ease the process of managing the system at run time.

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PARAMICS: microscopic traffic simulation for congestion management

PARAMICS: microscopic traffic simulation for congestion mana...

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IEE Colloquium on Dynamic Control of Strategic Inter-Urban Road Networks

作者： M. Smith G. Duncan S. Druitt Edinburgh Parallel Computing Centre Edinburgh UK SIAS Limited Edinburgh UK

The authors describe PARAMICS which consists of a suite of software tools for the simulation of traffic conditions at the individual vehicle level. The software is the result of three years of joint development between the Edinburgh parallel computing centre (EPCC) and SIAS Ltd. Microscopic simulation has been a desire of traffic modelers and transportation planners for many years, since it is only by considering individual vehicles that congestion effects, variable driver behaviour effects, and accurate pollution emissions can be simulated. The current PARAMICS software accepts standard traffic modelling data formats, and includes a large number of transport planning and environmental features.

关键词： Simulation Software tools Traffic control (transportation) Transportation

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Exahd: An exa-scalable two-level sparse grid approach for higher-dimensional problems in plasma physics and beyond

Exahd: An exa-scalable two-level sparse grid approach for hi...

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International Workshop on parallel Processing, Euro-Par 2014

作者： Pflüger, Dirk Heene, Mario Bungartz, Hans-Joachim Kowitz, Christoph Hinojosa, Alfredo Parra Griebel, Michael Zaspel, Peter Jenko, Frank Dannert, Tilman Institute for Parallel and Distributed Systems University of Stuttgart Germany Chair of Scientific Computing Technische Universität München Germany Institute for Numerical Simulation University of Bonn Germany Max Planck Institute for Plasma Physics Germany Computing Centre of the Max Planck Society and the MPI for Plasma Physics Germany

ISBN: (纸本)9783319143125

High-dimensional problems pose a challenge for tomorrow’s supercomputing. Problems that require the joint discretization of more dimensions than space and time are among the most compute-hungry ones and thus standard candidates for exascale computing and even beyond. This project tackles such problems by a hierarchical extrapolation approach, the sparse grid combination technique. The method not only enables their treatment in the first place. The hierarchical approach also provides novel ways to deal with central problems in high-performance computing such as scalability and resilience: Global communication can be avoided and reduced to a small subset, and faults can be compensated for without the need for recomputations or checkpoint-restart. As an exemplary prototype for high-dimensional problems, turbulence simulations in plasma physics are studied. ©Springer International Publishing Switzerland 2014.

关键词： Computers

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Three dimensional and thermal transient analysis of sedimentary rocks

Three dimensional and thermal transient analysis of sediment...

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Eighth International Conference on Advanced Computational Methods in Heat Transfer, HEAT TRANSFER VIII

作者： King, V.P.S. Landau, L. Alves, J.L.D. Martins, M.A.D. Lab. for Compl. Methods in Eng. COPPE Fed. University of Rio de Janeiro Brazil Centre for Parallel Computing COPPE Federal University of Rio de Janeiro Brazil

This work presents the implementation of a finite element code for the thermal transient analysis of sedimentary rocks. This analysis provides a means to assess the thermal history in sedimentary rocks, assisting the studies of hydrocarbon generation and migration processes. The unstructured 3D mesh of tetrahedral elements provides the discrete model. An iterative driver using an edge-by-edge data structure solves the resulting system of equations at each time step. This strategy provides considerable improvements in terms of CPU time and memory demand. This combination enables the study of complex 3D problems, a key issue to basin analysis.

关键词： Sedimentary rocks

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Information management for computational Grids

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International Journal of Web Services Research 2005年第3期2卷 69-82页

作者： Jie, Wei Zang, Tianyi Hung, Terence Turner, Stephen J. Cai, Wentong Institute of High Performance Computing Singapore Singapore Nanyang Technological University Singapore Singapore Singapore Singapore Software and Computing Program Institute of High Performance Computing Singapore Singapore School of Computer Engineering Parallel and Distributed Computing Centre Singapore Singapore

Information Service is a key component of a Grid environment and crucial to the operation of a computational Grid. This paper presents an Information Service for a computational Grid Virtual Organization (VO). The main functionality of this Information Service is the provision of information essential for applications running on a computational Grid. This Information Service is a hierarchical structure that consists of VO layer, site layer, and resource layer. We propose different models of information data organization for Information Service, and experiments were conducted to evaluate the performance of these models. Based on the experimental results, we further introduce the data organization model for our Information Service. The implementation of the Information Service is based on the Globus Toolkit and complies with the OGSI (Open Grid Services Infrastructure) specifications. In this paper, some application experiences of using the Information Service are also presented. Copyright © 2005, Idea Group Inc.

关键词： Distributed computer systems

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Automatic Service Deployment Using Virtualisation

Automatic Service Deployment Using Virtualisation

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Euromicro Conference on parallel, Distributed and Network-Based Processing

作者： Gabor Kecskemeti Peter Kacsuk Gabor Terstyanszky Tamas Kiss Thierry Delaitre Laboratory of Parallel and Distributed Systems MTA SZTAKI Budapest Hungary Centre for Parallel Computing University of Westminster London UK

Manual deployment of the application usually requires expertise both about the underlying system and the application. Automatic service deployment can improve deployment significantly by using on-demand deployment and self-healing services. To support these features this paper describes an extension the globus workspace service. This extension includes creating virtual appliances for grid services, service deployment from a repository, and influencing the service schedules by altering execution planning services, candidate set generators or information systems.

关键词： Application software Licenses parallel processing Home appliances Mesh generation Databases Communication system traffic control Control systems Production Contracts

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Modeling Human-Like Decision Making for Virtual Agents in Time-Critical Situations

Modeling Human-Like Decision Making for Virtual Agents in Ti...

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International Conference on Cyberworlds

作者： Linbo Luo Suiping Zhou Wentong Cai Michael Lees Malcolm Yoke Hean Low Parallel and Distributed Computing Centre School of Computer Engineering Nanyang Technological University Singapore

Generating human-like behaviors for virtual agents has become increasingly important in many applications, such as crowd simulation, virtual training, digital entertainment, and safety planning. One of challenging issues in behavior modeling is how virtual agents make decisions given some time-critical and uncertain situations. In this paper, we present HumDPM, a decision process model for virtual agents, which incorporates two important factors of human decision making in time-critical situations: experience and emotion. In HumDPM, rather than relying on deliberate rational analysis, an agent makes its decisions by matching past experience cases to the current situation. We propose the detailed representation of experience case and investigate the mechanisms of situation assessment, experience matching and experience execution. To incorporate emotion into HumDPM, we introduce an emotion appraisal process in situation assessment for emotion elicitation. In HumDPM, the decision making process of an agent may be affected by its emotional states when: 1) deciding whether it is necessary to do a re-match of experience cases, 2) determining the situational context, and 3) selecting experience cases. We illustrate the effectiveness of HumDPM in crowd simulation. A case study for emergency evacuation in a subway station scenario is conducted, which shows how a varied crowd composition leads to different evacuation behaviors, due to the retrieval of different experiences and the variation of agents' emotional states.

关键词： Appraisal Decision making Humans Computational modeling Context Time factors Context modeling

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GEMLCA: grid execution management for legacy code architecture design

GEMLCA: grid execution management for legacy code architectu...

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EUROMICRO Conference

作者： T. Delaitre A. Goyeneche P. Kacsuk T. Kiss G.Z. Terstyanszky S.C. Winter Centre for Parallel Computing Cavendish School of Computer Science University of Westminster London UK

The grid execution management for legacy code architecture (GEMLCA) describes a solution for exposing and executing legacy applications through an OGSI grid service. This architecture has been introduced in a previous paper by the same authors where the general concept was demonstrated by creating an OGSI/GT3 version of the MadCity traffic simulator. The class structure of the architecture is described presenting each component and describing the relationships between them. Also, the current architecture implementation is evaluated through test results gained by running the MadCity traffic simulator as a C/PVM legacy application.

关键词： Computer architecture Grid computing Java Wrapping Testing Traffic control Computational modeling Application software Service oriented architecture parallel processing

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