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International Workshop on Object Orientation in Operating systems

作者： A. Judge V. Cahill Distributed Systems Group Department of Computer Science Trinity College Dublin Dublin Ireland

This paper presents a design for the use of DSM techniques and system-supported synchronisation to support shared access to persistent objects in a distributed environment. We adopt a hybrid approach where the system granularity is sometimes pages and sometimes objects. We are interested in providing shared access to small (i.e., less than a page) objects in a general purpose, language-independent environment, and supporting both DSM and RPC object access mechanisms.< >

关键词： Hardware computer science Educational institutions Object oriented modeling Law Legal factors Object oriented databases Transaction databases computer languages Joining processes

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Using the ISIS resource manager for distributed, fault-tolerant computing 26

Using the ISIS resource manager for distributed, fault-toler...

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26th Hawaii International Conference on System sciences, HICSS 1993

作者： Clark, Timothy A. Birman, Kenneth P. Isis Distributed Systems Inc. 111 South Cayuga Street IthacaNY14850 United States Department of Computer Science Cornel1 University IthacaNY14853 United States

ISBN: (纸本)0818632305

Under current versions of the UNIX operating system, it is difficult to take advantage of the massive computing power of idle or lightly loaded workstations on a network. The authors introduce the ISIS resource manager, a distributed fault-tolerant application capable of recapturing this processing power, as well as providing a transparent interface to network computing resources. They discuss the growing importance of high-speed workstation networks and the need for network management utilities and consider how advances in software technology have made it possible to easily construct a distributed fault-tolerant application to meet this need. The architecture of the resource manager is described as an example of this class of application. © 1993 IEEE.

关键词： Managers

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Parallel naive and semi-naive transitive closure evaluation

Parallel naive and semi-naive transitive closure evaluation

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International Conference on Computing and Information (ICCI)

作者： Xiaofang Zhou M.E. Orlowska CRC for Distributed Systems Technology and Department of Computer Science University of Queensland Brisbane QLD Australia

Transitive closure operation is an important extension to relational algebra. The two most well-known methods to compute transitive closure are naive and semi-naive approaches. We give the optimal parallel versions of... 详细信息

关键词： Deductive databases Relational databases Database languages Cyclic redundancy check computer science Algebra Performance evaluation Linear systems Equations Pattern recognition

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Secure Environment for Information systems in Medicine

Secure Environment for Information Systems in Medicine

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International Conference on Image Management and Communication in Patient Care

作者： A. Patel Computer Networks & Distributed Systems Research Group Department of Computer Science University College Dublin Dublin Ireland

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An ODP-based approach to overcoming heterogeneity in wide area networks

An ODP-based approach to overcoming heterogeneity in wide ar...

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IEEE Singapore International Conference on Networks

作者： W. Brookes J. Indulska CRC for Distributed Systems Technology Department of Computer Science University of Queensland Saint Lucia QLD Australia

computer networks are growing in number and capacity, and internetworking allows users to access services globally. An inherent problem of such large networks is managing the heterogeneity of applications, hardware and supporting software. Open distributed Processing (ODP) introduces type description and type management functions as a mechanism for overcoming this heterogeneity. This paper considers issues surrounding the construction of an ODP-based type manager. It sets requirements for such a type manager and describes a canonical type model for ODP-based systems. The functionality and structure of the type manager are given and then this approach is compared with the type management facilities in existing platforms for distributed computing.

关键词： Intelligent networks Wide area networks Application software computer network management Resource management Runtime distributed processing Cyclic redundancy check computer science Hardware

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Using the ISIS resource manager for distributed, fault-tolerant computing

Using the ISIS resource manager for distributed, fault-toler...

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Annual Hawaii International Conference on System sciences (HICSS)

作者： T.A. Clark K.P. Birman Isis Distributed Systems Inc. Ithaca NY USA Department of Computer Science Cornell University Ithaca NY USA

关键词： Intersymbol interference Resource management Fault tolerance distributed computing Application software Power system management computer networks Workstations computer network management Operating systems

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Trace driven analysis of write caching policies for disks 93

Trace driven analysis of write caching policies for disks

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1993 ACM SIGMETRICS Conference on Measurement and Modeling of computer systems, SIGMETRICS 1993

作者： Biswas, Prabuddha Ramakrishnan, K.K. Towsley, Don Office and Teamware Engineering Group Digital Equipment Corporation 110 Spitbrook Road NashuaNH United States Distributed Systems Architecture and Performance Group Digital Equipment Corporation 550 King Street LittletonMA United States Computer Science Department University of Massachusetts AmherstMA United States

ISBN: (纸本)0897915801

The I/O subsystem in a computer system is becoming the bottleneck as a result of recent dramatic improvements in processor speeds. Disk caches have been effective in closing this gap but the benefit is restricted to the read operations as the write I/Os are usually committed to disk to maintain consistency and to allow for crash recovery. As a result, write I/O traffic is becoming dominant and solutions to alleviate this problem are becoming increasingly important. A simple solution which can easily work with existing file systems is to use non-volatile disk caches together with a write-behind strategy. In this study, we look at the issues around managing such a cache using a detailed trace driven simulation. Traces from three different commercial sites are used in the analysis of various policies for managing the write cache. We observe that even a simple write-behind policy for the write cache is effective in reducing the total number of writes by over 50%. We further observe that the use of hysteresis in the policy to purge the write cache, with two thresholds, yields substantial improvement over a single threshold scheme. The inclusion of a mechanism to piggyback blocks from the write cache with read miss I/Os further reduces the number of writes to only about 15% of the original total number of write operations. We compare two piggybacking options and also study the impact of varying the write cache size. We briefly looked at the case of a single non-volatile disk cache to estimate the performance impact of statically partitioning the cache for reads and writes. © 1993 ACM.

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CONCURRENT BOUNDARY-ELEMENT COMPUTATION

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INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 1993年第2期6卷 83-98页

作者： MCDOWALL, DS LEE, TW FUSCO, VF Microwave Research Group Department of Electrical and Electronic Engineering The Queen's University of Belfast Ashby Building Stranmillis Road Belfast BT9 5AH Northern Ireland U.K. D. Stewart McDowall was born in Dublin epublic of Ireland in 1967. He received the M. Eng. degree in Electrical and Electronic Engineering from the Queen's University of Belfast in 1990. In the same year he was presented with a Distinction Award from the Department of Education of Northern Ireland and he is currently pursuing his Ph.D. in the Microwave Research Group at Q.U.B. His principal research area is the electromagnetic field mapping of microwave systems using concurrient programming. He is an Associate Member of the Institute of Electrical Engineers. Lee Thaim Wee was awarded the degree of B. Eng. in Electronics from the Queen's University of Belfast in July 1991. He is currently serving in the Malaysian Armed Forces. Vincent F. Fusco was educated at the Queen's Univeristy of Belfast where he obtained the degree of Ph.D. in 1982. He has worked as a research engineer on short-range radar and radio telementry systems. Currently he is a reader in Microwave Communications in the School of Electrical Engineering and Computer Science the Queen's Univeristy of Belfast. His current research interests include non-linear microwave circuit simulation and concurrent programming techniques for electromagnetic field problems with particular emphasis on EMC applications. He has published numerous research papers in these areas. He is the author of the bookMicrowave Circuits Analysis and Computer Aided Design Prentice-Hall 1987. Dr Fusco is a Chartered Electrical Engineer and a Member of the Institute of Electrical Engineers.

A major limitation of the boundary element method (BEM) for the solution of electrical potential problems is the long computational time required. However, a large portion of the calculations involved can be viewed as being parallel in nature and can therefore be computed concurrently. This paper makes an effort to increase the efficiency of the BEM process using transputer-based multiprocessor computing techniques. The algorithms developed may equally well be applied to any multiprocessor system. The application selected to demonstrate the technique is the solution of an electrostatic problem governed by a two-dimensional Laplace equation. A parallel algorithm for problem setup and field extraction using BEM is designed and implemented on a transputer array. Special attention is directed to the utilization of the parallel processors to achieve maximum efficiency. The analysis in this work concentrates on the communication strategies for passing data between processors as well as a consideration of the workload attributed to each processor. The parallel algorithms were implemented using 3L Parallel Fortran;however, the choice of topology for the overall BEM implementation was limited by the fact that certain parts of the algorithm could only utilize a pipeline configuration of processors. Comprehensive results for the parallel BEM algorithm are given and they are encouraging, indicating that parallel processing has much to offer when applied to the boundary element method.

关键词： Boundary element method

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TLM MODELING USING AN SIMD computer

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INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 1993年第4期6卷 299-304页

作者： TAN, CC FUSCO, VF The Queen's University of Belfast Department of Electrical & Electronic Engineering Ashby Building Stranmillis Road Belfast BT9 5AH U.K. Chun Chia Tan obtained a first-class honours degree from The Queen's University of Belfast. He was awarded an IEE prize for best final-year project. His current research interests include the modelling of electromagnetic fields using parallel processing techniques. At present Mr Tan is working as an electrical engineer in Malaysia. Vincent F. Fusco was educated at The Queen's University of Belfast where he obtained the degree of Ph.D. He has worked as a research engineer on short-range radar and radio telementry systems. Currently he is a Reader in Microwave Commnications in the School of Electrical Engineering and Computer Science The Queen's Univeristy of Belfast. His current research interests include non-linear microwave circuit simulation and concurrent programming techniques for electromagnetic field problems. He has acted as consultant to a number of major companies and has published numerous research papers in these areas. He is author of the bookMicrowave Circuits Analysis and Computer Aided Design(Prentice Hall 1987). Dr Fusco is a Chartered Electrical Engineer and a Member of the Institute of Electrical Engineers.

A major limitation of the transmission-line matrix (TLM) method used to solve Maxwell's equations is the long computation time required. The TLM scattering calculations involved can, however, be viewed as parallel in nature. This paper describes an effort to reduce computational time by using an SIMD, DAP multiprocessor computer employed to solve a two-dimensional TLM electromagnetic field formulation. A parallel algorithm based on the TLM scattering algorithm is designed and implemented using FORTRAN-PLUS Enhanced on an AMT DAP 510 machine. Here the connectivity of the DAP is exploited to simulate the intrinsic scattering behaviour on which the TLM algorithm relies. The results show that parallel processing on an SIMD machine such as the DAP is advantageous, especially for higher-order mesh sizes.

关键词： Electric lines

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DESIGNING HARD REAL-TIME systems 11th

DESIGNING HARD REAL-TIME SYSTEMS

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11TH ADA / EUROPE INTERNATIONAL CONF : MOVING TOWARDS 2000

作者： BURNS, A WELLINGS, AJ Real-time and Distributed Systems Research Group Department of Computer Science University of York Heslington York Y01 5DD United Kingdom

ISBN: (纸本)3540555854

This paper presents a systems life cycle and a structured design method which are tailored towards the construction of real-time systems in general, and hard real-time systems in particular. The standard systems life cycle is modified to take into account the expression and satisfaction of non-functional requirements. The HOOD design method is extended to support abstractions which explicitly cater for the characteristics and properties of hard real-time systems. The new method is called HRT-HOOD (Hard Real-time HOOD). © Springer-Verlag Berlin Heidelberg 1992.

关键词： Real time systems

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