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2005 IEEE International Symposium on Cluster computing and the Grid, CCGrid 2005

作者： Ho, Quoc-Thuan Cai, Wentong Ong, Yew-Soon Institute of High Performance Computing Agency for Science Technology and Research Singapore Science Park II 1 Science Park Road Singapore 117528 Singapore Parallel and Distributed Computing Centre School of Computer Engineering Nanyang Technological University Singapore 639798 Singapore

ISBN: (纸本)0780390741

Multi-cluster Grids have emerged as the most popular type of Grid environments. On multi-cluster Grid, resources are distributed across different networks. Hence, scheduling and dispatching jobs are difficult and inefficient due to the restrictions of network and the communication over-head. This paper presents the design and implementation of an efficient GridRPC system for the multi-cluster Grid. Metascheduling mechanism is developed to distribute jobs onto different clusters of computers effectively. Further, a dynamic bundling mechanism is provided to reduce overhead of job dispatching. This mechanism bundles similar requests to form a composite request that is dispatched to a Grid resource. The above mechanisms have been tested with different types of services and loads, and the results show that they help to achieve more balanced workload and reduce the overhead of job dispatching. This cuts down execution time of applications. © 2005 IEEE.

关键词： Distributed computer systems

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Security mechanisms for legacy code applications in GT3 environment

Security mechanisms for legacy code applications in GT3 envi...

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Euromicro Conference on parallel, Distributed and Network-Based Processing

作者： G. Terstyanszky T. Delaitre A. Goyeneche T. Kiss K. Sajadah S.C. Winter P. Kacsuk Centre of Parallel Computing Universitv of Westminster London Centre of Parallel Computing Cavendish School of Computer Science University of Westminster London UK MTA SZTAKI Laboratory of Parallel and Distributed Systems Budapest Hungary

There are many legacy code applications that cannot be run in grid environment without significant modifications. To avoid reengineering 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 is an OGSI grid service layer that supports submitting jobs, getting their results and status back. Security requirements are essential to any grid application to preserve the confidentiality and integrity of data. To meet these requirements the GT3 security model was implemented in GEMLCA. The paper introduces GEMLCA and how grid security infrastructure (GSI) components have been added to GEMLCA in order to enable secure execution of jobs in grid. The paper also presents how a legacy code traffic simulator was transformed into a grid service using GEMLCA and gives some simulation results.

关键词： Java Data security Computational modeling Wrapping Application software Testing Grid computing Computer architecture Concurrent computing Distributed computing

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GEMLCA: Running legacy code applications as Grid services

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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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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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Performance evaluation of a bandwidth requirements reduction technique based on timely state update

Performance evaluation of a bandwidth requirements reduction...

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Annual Symposium on Simulation

作者： Wentong Cai S.J. Turner Suiping Zhou Junhu Wei Wenbo Zong Parallel & Distributed Computing Centre School of Computer Engineering Nanyang Technological University Singapore

An important issue in distributed real-time simulation is to reduce the amount of data transmitted amongst distributed simulation nodes so that the state updates of simulation entities can be sent to other simulation nodes in a timely manner. To address this issue, we have previously proposed a consistency model to determine the update interval of entities based on their relative importance, a utility model to compute the relative importance of entities, and a flexible state update mechanism to ensure updating within these intervals and to balance the number of updates in each simulation frame. In this paper, we focus on the performance evaluation of these timely state update mechanisms. Using a battlefield benchmark, the performance is evaluated in terms of the total amount of data exchanged, the number of simulation frames skipped, and the number of go-through-accidents occurring during the simulation. The performance results indicate that the mechanisms can significantly reduce the bandwidth requirements while maintaining or even improving the consistency of the simulation.

关键词： Bandwidth Computational modeling Computer simulation Distributed computing Large-scale systems Frequency Engines Concurrent computing Data engineering Military computing

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Cluster computing and Grid 2005 works in progress

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IEEE Distributed Systems Online 2005年第9期6卷

作者： Wang, Frank Helian, Na Wu, Sining Deng, Yuhui Zhou, Ke Guo, Yike Thompson, Steve Johnson, Ian Milward, Dave Maddock, Robert Khoo, Benjamin Bharadwaj, Veeravalli Cambridge-Cranfield High Performance Computing Facility London Metropolitan University Cranfield University Imperial College Xyratex Department of Grid Computing and E-science Centre for Grid Computing Data Mining at the London Metropolitan University Centre for Grid Computing Cranfield University London E-science Centre Parallel Computing Centre Imperial College National University of Singapore Department of Electrical and Computer Engineering National University of Singapore

A grid-oriented storage (GOS) project, which aims to support advanced data bank services and data reservoirs for sharing data on the gird, is discussed. The GOS appliance is a disk array that connects directly to the grid using a Globus XIO interface and fits in the thin server categorization. The security model of the GOS is based on the Grid security Infrastructure (GSI). A dynamic estimation scheme for fault-free scheduling in grid systems is also discussed. Most of the grid falls into one of the two categories, planned and negotiated, and dynamic and voluntary. This discrepancy is the main reason behind the complexity in designing robust and fault tolerant scheduling algorithms for both resource categories.

关键词： Data storage equipment

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A cots simulation package emulator (CSPE) for investigating cots simulation package interoperability

A cots simulation package emulator (CSPE) for investigating ...

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2005 Winter Simulation Conference

作者： Wang, Xiaoguang Turner, Stephen John Taylor, Simon J. E. Low, Malcolm Yoke Hean Gan, Boon Ping Parallel and Distributed Computing Centre School of Computer Engineering Nanyang Technological University 639798 Singapore Singapore Centre for Applied Simulation Modeling School of Information Systems Computing and Mathematics Brunel University Uxbridge UB8 3PH United Kingdom D-SIMLAB Programme Singapore Institute of Manufacturing Technology 71 Nanyang Drive 638075 Singapore Singapore

ISBN: (纸本)0780395204

Commercial Off-The-Shelf (COTS) Simulation Packages (CSPs) are widely used to facilitate the creation of simulation models using some kind of visual interactive interface. CSPs have "evolved" over the years and are well used to support modeling demands in different market niches and domains. However, in terms of distributed simulation, there is almost a complete lack of support for interoperability. The advent of the High Level Architecture (HLA) standard makes it possible to connect distributed model components together. The model components can be developed using specific CSPs best suited to the application area. In this paper, a CSP Emulator (CSPE) is proposed to investigate the interfaces between the CSPs and the HLA Runtime Infrastructure. In addition to support for standalone models as provided by current CSPs, the CSPE has some new features needed for building distributed models. An evaluation is conducted between CSPE and Simul8, one of the popular CSPs.

关键词： Electronics packaging

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Using manufacturing process flow for time synchronization in HLA-based simulation

Using manufacturing process flow for time synchronization in...

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9th IEEE International Symposium on Distributed Simulation and Real-Time Applications

作者： Gan, Boon Ping Low, Malcolm Yoke Hean Wang, Xiaoguang Turner, Stephen John D-SIMLAB Programme Singapore Institute of Manufacturing Technology 71 Nanyang Drive Singapore 638075 Singapore Parallel and Distributed Computing Centre School of Computer Engineering Nanyang Technological University Nanyang Avenue Singapore 639798 Singapore

Time synchronization has always been a critical deciding factor of whether interoperating simulation models using the High Level Architecture (HLA) is achievable efficiently. In this paper, we propose a conservative time synchronization algorithm that makes use of the manufacturing process flow information (a sequence of steps production lots flow through) in the computation of the request time. This time is used by the simulation federate to issue requests to advance time to the HLA Runtime Infrastructure (RTI). The proposed algorithm monitors the simulation events that potentially trigger external times tamp messages at the exit step and j processing steps before this exit step as well as simulation events that extend the timestamp of external messages. We evaluated the performance of this algorithm using a Borderless Fab simulation model on the AutoSched AP. The experimental results show that the algorithm performs much better than a straightforward use of the RTI's time synchronization, and the further back we went in looking at the processing steps, the better the execution time that was achieved. © 2005 IEEE.

关键词： Computer architecture

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Interoperating autosched AP using the high level architecture

Interoperating autosched AP using the high level architectur...

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2005 Winter Simulation Conference

作者： Gan, Boon Ping Lendermann, Peter Low, Malcolm Yoke Hean Turner, Stephen J. Wang, Xiaoguang Taylor, Simon J. E. D-SIMLAB Programme Singapore Institute of Manufacturing Technology 71 Nanyang Drive Singapore 638075 Singapore Parallel and Distributed Computing Centre Nanyang Technological University Block N4 Nanyang Avenue Singapore 639798 Singapore Centre for Applied Simulation Modeling School of Information Systems Computing and Mathematics Brunel University Uxbridge UB8 3PH United Kingdom

ISBN: (纸本)0780395204

The High Level Architecture (HLA) is an IEEE standard for interoperating simulation federates. In this paper, we describe a set of requirements that simulation packages need to satisfy in order to be made interoperable using the HLA standard. AutoSched AP, a commercial off-the-shelf simulation package (CSP) which is widely used in the semiconductor industry, was used as a case study for this interoperation exercise. We demonstrated that a straight-forward customization of the CSP through a middleware that provides standard functions for interoperation may not provide a satisfactory solution. A specially optimized time synchronization mechanism needs to be installed to ensure good execution efficiency. Experimental results using a Borderless Fab model that comprises of two factory models show that an optimized time synchronization mechanism results in an execution time that is ten times better than a straightforward application of the HLA Runtime Infrastructure's time synchronization mechanism.

关键词： Computer architecture

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Design and implementation of an efficient multi-cluster GridRPC system 05

Design and implementation of an efficient multi-cluster Grid...

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IEEE/ACM International Symposium on Cluster computing and the Grid (CCGRID)

作者： Quoc-Thuan Ho Wentong Cai Yew-Soon Ong Institute of High Performance Computing Agency for Science Technology and Research Singapore Parallel & Distributed Computing Centre School of Computer Engineering Nanyang Technological University Singapore

ISBN: (纸本)9780780390744

Multi-cluster Grids have emerged as the most popular type of grid environments. On multi-cluster grid, resources are distributed across different networks. Hence, scheduling and dispatching jobs are difficult and inefficient due to the restrictions of network and the communication overhead. This paper presents the design and implementation of an efficient GridRPC system for the multi-cluster grid. Metascheduling mechanism is developed to distribute jobs onto different clusters of computers effectively. Further, a dynamic bundling mechanism is provided to reduce overhead of job dispatching. This mechanism bundles similar requests to form a composite request that is dispatched to a grid resource. The above mechanisms have been tested with different types of services and loads, and the results show that they help to achieve more balanced workload and reduce the overhead of job dispatching. This cuts down execution time of applications.

关键词： Dispatching Distributed computing Computer architecture Concurrent computing Grid computing Mesh generation High performance computing Processor scheduling Testing Network servers

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