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Proceedings of the 1996 5th IEEE international symposium on High Performance distributed computing

作者： Hafid, Abdelhakim Bochmann, Gregor v. Kerherve, Brigitte Universite de Montreal Montreal Canada

this paper documents the design and implementation of a quality of service (QoS) negotiation procedure for distributed multimedia (MM) presentational applications, such as news-on-demand. the negotiation procedure described here is an instantiation of the general framework for QoS negotiation which was developed earlier. the proposal differs in many respects with the negotiation functions provided by existing approaches. Firstly, the negotiation process uses an optimization approach to find a configuration of system components which supports the user requirements. Secondly, the negotiation process supports the negotiation of a MM document and not only a single monomedia object. thirdly, the QoS negotiation takes into account the cost to the user. Finally, the negotiation process may be used to support automatic adaptation to react to QoS degradations, without intervention by the user/application.

关键词： distributed computer systems

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Study of caching proxy mechanisms realized on wide area distributed networks

Study of caching proxy mechanisms realized on wide area dist...

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Proceedings of the 1996 5th IEEE international symposium on High Performance distributed computing

作者： Oguchi, Masato Ono, Kinji Univ of Tokyo Tokyo Japan

the information retrieval systems on a wide area distributed network, such as the World-Wide Web(WWW), become popular among the extremely large number of users. the caching proxy has an important role on these systems for improving their accessibility and serviceability. the caching proxy mechanism is discussed in this paper as follows: First, the role and structure of the caching proxy are explained, and two major problems of existing systems are pointed out. Our solution to overcome these problems is proposed next. Changing a file size, by controlling a quality level of cached multimedia data, is proposed as a measure to overcome one problem. As a solution to the other problem, making a cluster among neighboring caching proxies, using hyperlink information, is proposed. Finally, an improved caching proxy mechanism based upon these ideas is shown.

关键词： distributed computer systems

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Designing directories in distributed systems: a systematic framework

Designing directories in distributed systems: a systematic f...

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Proceedings of the 1996 5th IEEE international symposium on High Performance distributed computing

作者： Chandy, K.Mani Schooler, Eve M. California Inst of Technology Pasadena United States

this paper proposes a framework for the systematic design of directory-based distributed applications. We evaluate a space of directory designs using our framework. We present a case study consisting of design, implementation and analysis of directories for a multicast application. Our framework is based on a model that extends the formal concept of process knowledge in distributed systems. this concept is used informally in phrases such as 'process p knows when it is in state s that process q is active.' We show that this definition of knowledge is too strong for many distributed applications, including directory design. We propose a weaker concept: estimation. We describe the meaning of phrases of the form: 'process p in state s estimates with probability 0.9 that process q is active.' We specify directory design as an optimization problem with the objective function of maximizing estimation probabilities, and with constraints on the amount of bandwidth, computation and storage used. We show how this specification helps in a systematic analysis of alternative directory designs.

关键词： distributed computer systems

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Task partitionings for parallel triangular solver on a MIMD computer 96

Task partitionings for parallel triangular solver on a MIMD ...

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international symposium on High Performance distributed computing

作者： Junming Qin T. Kai Yun Chan Division of Computer Engineering School of Applied Science Nanyang Technological University Singapore

ISBN: (纸本)9780818675829

Considers a parallel triangular solver on a distributed-memory MIMD computer. three task partitioning methods are discussed, with both task assignment and task scheduling. their estimated times are provided by using a performance model and a parallel performance evaluation methodology. the optimal task granularities are deduced by the analysis of their performance. Experiences on a transputer-based multicomputer are given.

关键词： Concurrent computing distributed computing parallel algorithms Processor scheduling Scientific computing Application software Algorithm design and analysis Linear systems Heart parallel processing

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Engineering parallel algorithms 96

Engineering parallel algorithms

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international symposium on High Performance distributed computing

作者： Niandong Fang Department of Computer Science University of Basel Basel Switzerland

ISBN: (纸本)0818675829

the rise of explicit parallel programming involves new problems: lack of structure for parallel algorithms and the ad hoc development of parallel algorithms. We use skeletons to characterize and design parallel algorithms and define a process to refine the designs step by step into programs. the paper introduces a high level library on top of MPI which is derived from the skeleton concept to achieve better programmability and obtain portability. We conclude with a CFD application to demonstrate our idea.

关键词： parallel algorithms parallel programming parallel processing Programming profession Skeleton Algorithm design and analysis Computational fluid dynamics Program processors Software engineering Concurrent computing

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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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Implementation and performance of a parallel file system for high performance distributed applications

Implementation and performance of a parallel file system for...

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international symposium on High Performance distributed computing

作者： W.B. Ligon R.B. Ross Clemson University USA

Dedicated cluster parallel computers (DCPCs) are emerging as low-cost high performance environments for many important applications in science and engineering. A significant class of applications that perform well on a DCPC are coarse-grain applications that involve large amounts of file I/O. Current research in parallel file systems for distributed systems is providing a mechanism for adapting these applications to the DCPC environment. We present the parallel Virtual File System (PVFS), a system that provides disk striping across multiple nodes in a distributed parallel computer and file partitioning among tasks in a parallel program. PVFS is unique among similar systems in that it uses a stream-based approach that represents each file access with a single set of request parameters and decouples the number of network messages from details of the file striping and partitioning. PVFS also provides support for efficient collective file accesses and allows overlapping file partitions. We present results of early performance experiments that show PVFS achieves excellent speedups in accessing moderately sized file segments.

关键词： File systems Application software Concurrent computing distributed computing Workstations parallel processing Computer networks Bandwidth High performance computing NASA

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Skil: an imperative language with algorithmic skeletons for efficient distributed programming 96

Skil: an imperative language with algorithmic skeletons for ...

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international symposium on High Performance distributed computing

作者： G.H. Botorog H. Kuchen Lehrstuhl für Informatik II RWTH Aachen University of Technology Aachen Germany

ISBN: (纸本)9780818675829

We present Skil, an imperative language enhanced with higher order functions and currying, as well as with a polymorphic type system. the high level of Skil allows the integration of algorithmic skeletons, i.e. of higher order functions representing parallel computation patterns. At the same time, the language can be efficiently implemented. After describing a series of skeletons which work with distributed arrays, we give two examples of parallel programs implemented on the basis of skeletons, namely shortest paths in graphs and Gaussian elimination. Run time measurements show that we approach the efficiency of message passing C up to a factor between 1 and 2.5.

关键词： Skeleton parallel processing Concurrent computing Testing Functional programming Electronic mail Time measurement parallel programming Load management Impedance

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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...

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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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Fixing the ''broken-link'' problem: the W3Objects approach

COMPUTER NETWORKS AND ISDN SYSTEMS

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COMPUTER NETWORKS AND ISDN SYSTEMS 1996年第7-11期28卷 1255-1268页

作者： Ingham, D Caughey, S Little, M Department of Computing Science University of Newcastle upon Tyne Newcastle upon Tyne NEI 7RU United Kingdom

One of most serious problems plaguing the World Wide Web today is that of broken hypertext links, which are a major annoyance to browsing users and also a cause of tarnished reputation and possible loss of opportunity for information providers. the root of the problem lies in the current Web architecture's lack of support for referential integrity. this paper presents a model for the provision of referential integrity for Web resources which supports resource migration and tolerates site and communication failures. the approach is object-oriented, highly flexible, completely distributed, and does not require any global administration. An attractive feature of our design is the provision of a lightweight mechanism which provides referential integrity, and which may be customised on a per resource basis to provide increased fault-tolerance and performance. Our system follows an evolutionary approach, supporting parallel operation with the existing Web, allowing users to gain the additional benefits of referential integrity while allowing continued access through trusted software components.

关键词： distributed systems World Wide Web object-oriented referential integrity migration transparency

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