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Fault-tolerant CORBA name server

Fault-tolerant CORBA name server

引用

Proceedings of the 1996 15th symposium on Reliable Distributed Systems

作者： Maffeis, Silvano Olsen & Associates Zurich Switzerland

OMG CORBA applications require a distributed naming service in order to install and to retrieve object references. high availability of the naming service is important since most CORBA applications need to access it at least once during their lifetime. Unfortunately, the OMG standards do not deal with availability issues;the naming services of many of the commercially available CORBA object request brokers introduce single points of failure. In this paper we describe the design and implementation of a replicated, highly-available CORBA name server that adheres to the OMG Common Object Services Specification. Our naming service can be replicated at run-time, while many applications are installing and retrieving object references. We compare our approach with the approaches taken by the ILU, NEO, Orbix, and DOME object request brokers. the performance of our name server is measured for various degrees of replication.

关键词： Fault tolerant computer systems

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Dynamic fault tolerance in DCMA-a dynamically configurable multicomputer architecture

Dynamic fault tolerance in DCMA-a dynamically configurable m...

引用

Reliable Distributed Systems

作者： H. Kuefner H. Baehring Department of Computer Science Fern Universitat Hagen Hagen Germany

this paper introduces a new architecture for a fault-tolerant computer system which connects high-end PCs or workstations by a high-speed network. To achieve platform independence, coupling is based on the widely used PCI-bus. In contrast to commercially available fault-tolerant systems we strongly emphasize mechanisms for tolerating transient and intermittent faults. To keep hardware costs low the system is built with off-the-shelf computers and their extensions are kept as small as possible. To reduce the operational costs the system can be dynamically adapted to different demands on fault tolerance on a program-by-program basis. Adaptation is done transparently to the application software by the operating system. We use a commercially available real-time operating system with a POSIX-compliant UNIX-interface. the bandwidth of fault tolerance reaches from a non-redundant system of stand-alone computers, a master/checker configuration to a TMR-system. the high-performance network allows the system to operate as a parallel multicomputer, too.

关键词： Fault tolerance Fault tolerant systems Costs Operating systems computer architecture computer networks Personal communication networks Workstations high-speed networks Hardware

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Runtime support for parallelization of data-parallel applications on adaptive and nonuniform computational environments

Runtime support for parallelization of data-parallel applica...

引用

International symposium on high performance Distributed computing

作者： M. Kaddoura S. Ranka School of Computer and Information Science 2-120 Center for Science & Technology Syracuse University Syracuse NY USA

In this paper, we discuss the runtime support required for the parallelization of unstructured data-parallel applications on nonuniform and adaptive environments. the approach presented is reasonably general and is applicable to a wide variety of regular as well as irregular applications. We present performance results for the solution of an unstructured mesh on a cluster of heterogeneous workstations.

关键词： Concurrent computing Workstations Load management Application software Runtime environment Processor scheduling Information science computer networks Multiprocessor interconnection networks computer architecture

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A fault-tolerant CORBA name server

A fault-tolerant CORBA name server

引用

Reliable Distributed Systems

作者： S. Maffeis Olsen and Associates Zurich Switzerland

OMG CORBA applications require a distributed naming service in order to install and to retrieve object references. high availability of the naming service is important since most CORBA applications need to access it at least once during their lifetime. Unfortunately, the OMG standards do not deal with availability issues; the naming services of many of the commercially available CORBA object request brokers introduce single points of failure. In this paper we describe the design and implementation of a replicated, highly-available CORBA name server that adheres to the OMG Common Object Services Specification. Our naming service can be replicated at run-time, while many applications are installing and retrieving object references. We compare our approach with the approaches taken by the ILU, NEO, Orbix, and DOME object request brokers. the performance of our name server is measured for various degrees of replication.

关键词： Fault tolerance Application software computer languages Availability Runtime Management information systems System software computer architecture Costs computer science

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Towards Web/Java-based high performance distributed computing-an evolving virtual machine 96

Towards Web/Java-based high performance distributed computin...

引用

International symposium on high performance Distributed computing

作者： G. Fox W. Furmanski Northeast Parallel Architectures Center Syracuse University Syracuse NY USA

ISBN: (纸本)9780818675829

Discusses the emergent World Wide Web-based distributed environments for high-performance computing and communications (HPCC) on the National Information Infrastructure (NII) with the focus on Java as an enabling technology. We start with a review of the past, present and near-term future of the "Java phenomenon", exposed in the background of some related previous approaches towards a distributed interpretative virtual machine architecture. Next, we discuss the anticipated role of Java in building distributed Web-based computing environments. We outline an evolutionary path from the current Web technology "soup" towards "all-Java" systems and we illustrate this process in terms of the Northeast Parallel architectures Center (NPAC) Web technology prototypes (WebVM, WebFlow, Bridge-based Collaboratory) and selected applications (CareWeb, 3D Visible Human).

关键词： Java Distributed computing high performance computing Virtual machining computer architecture Buildings Parallel architectures Prototypes Collaboration Humans

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Exploiting data-flow for fault-tolerance in a wide-area parallel system

Exploiting data-flow for fault-tolerance in a wide-area para...

引用

Reliable Distributed Systems

作者： Anh Nguyen-Tuong A.S. Grimshaw M. Hyett Department of Computer Science University of Virginia Charlottesville VA USA

Wide-area parallel processing systems will soon be available to researchers to solve a range of problems. In these systems, it is certain that host failures and other faults will be a common occurrence. Unfortunately, most parallel processing systems have not been designed with fault-tolerance in mind. Mentat is a high-performance object-oriented parallel processing system that is based on an extension of the data-flow model. the functional nature of data-flow enables both parallelism and fault-tolerance. In this paper, we exploit the data-flow underpinning of Mentat to provide easy-to-use and transparent fault-tolerance. We present results on both a small-scale network and a wide-area heterogeneous environment that consists of three sites: the National Center for Supercomputing Applications, the University of Virginia and the NASA Langley Research Center.

关键词： Fault tolerant systems Fault tolerance World Wide Web Parallel processing Space technology Bandwidth Distributed computing Software prototyping Concurrent computing Application software

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A task migration implementation of the Message-Passing Interface

A task migration implementation of the Message-Passing Inter...

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International symposium on high performance Distributed computing

作者： J. Robinson S.H. Russ B. Flachs B. Heckel NSF Engineering Research Center for Computatiorial Field Simulation Mississippi State University USA MicroMagnetic Inc. Sunnyvale CA USA

In order to use networks of workstations in parallel processing applications, several schemes have been devised to allow processes on different, possibly heterogeneous, platforms to communicate with one another. the Message-Passing Interface (MPI) is one such scheme that allows for message-passing across different architectures. the MPI specification does not make provisions for the migration of a process between machines. this paper describes the work required to modify, an MPI implementation to allow for task migration. It also describes "Hector", our heterogeneous computing task allocator that is used to migrate tasks automatically and improve the overall performance of a parallel program.

关键词： Workstations Concurrent computing Parallel processing Parallel programming computer networks Computational modeling computer architecture Scientific computing Floating-point arithmetic Distributed computing

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CNI: a high-performance network interface for workstation clusters 96

CNI: a high-performance network interface for workstation cl...

引用

International symposium on high performance Distributed computing

作者： P. Sarkar M. Bailey University of Arizona Tucson AZ US Dept. of Comput. Sci. Arizona Univ. Tucson AZ USA

ISBN: (纸本)9780818675829

Networks of workstations provide an economic solution for scalable computing because they do not require specialized components. Even though recent advances have shown that it is possible to obtain high bandwidth between applications, interconnect latency remains a serious concern. We present CNI, a cluster network interface that not only provides both low latency and high bandwidth but also efficiently supports multiple programming paradigms. this is done by functionally coupling the network adaptor board more closely to the CPU without changing the standard workstation architecture. CNI results in performance gains for applications, substantially reducing communication overhead and delay.

关键词： Network interfaces Workstations Delay Bandwidth computer networks performance gain

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A heterogeneous hierarchical solution to cost-efficient high performance computing

A heterogeneous hierarchical solution to cost-efficient high...

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International symposium on Parallel and Distributed Processing (IPDPS)

作者： Z.B. Miled J.A.B. Fortes Sch. of Electr. & Comput. Eng. Purdue Univ. West Lafayette IN USA School of Electrical and Computer Engineering Purdue University West Lafayette IN USA

Two facts that suggest the desirability of a hierarchical approach to cost-effective high-performance computing are empirically established in this paper. the first fact is the temporal locality of programs with respect to the degree of parallelism. Two temporal (instruction and data) locality principles are identified and empirically established for a set of programs. the impact of this behavior is discussed with respect to the proposed heterogeneous multilevel architecture. the second fact that supports the hierarchical architecture is the cost-efficiency advantage of heterogeneous over homogeneous multiprocessor systems. An initial performance analysis is presented which quantifies this fact for the proposed heterogeneous hierarchical organization. the proposed multilevel processor configuration uses fast and costly resources sparingly to reduce sequential and low parallelism bottlenecks. the resulting organization tries to balance cost, speed and parallelism granularity.

关键词： high performance computing Parallel processing Concurrent computing Costs Bridges Multiprocessing systems Research and development Application software computer applications Environmental economics

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Primary copy method and its modifications for database replication in distributed mobile computing environment

Primary copy method and its modifications for database repli...

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Reliable Distributed Systems

作者： A. Zaslavsky M. Faiz B. Srinivasan A. Rasheed S. Lai Department of Computer Technology Monash University East Caulfield VIC Australia SPL Worldgroup Private Limited Singapore

Rapidly expanding cellular communication technology, wireless LANs and satellite services have made it possible for mobile users to access information anywhere and at any time. In a mobile computing environment replication might be considered as an essential technique providing reliability, throughput increase and data availability. this paper addresses the replica control protocols with an emphasis on workstation mobility issues. the modifications that have to be made to the primary copy method for replicated database management strategies in order to address the effect of mobility on the existing replica control protocols are analysed and proposed. A variation of the primary copy algorithm, called virtual primary copy method is proposed and it is shown that this method is well suited for the distributed mobile computing environment. the performance of virtual primary copy method comparative to traditional primary copy method using computer simulation is analysed.

关键词： Databases Mobile computing Communications technology Wireless LAN Artificial satellites throughput Availability Communication system control Access protocols Workstations

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