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检索条件"任意字段=PDSE 2000: International Symposium on Software Engineering for Parallel and Distributed Systems"

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An on-line scheduling and allocation scheme for real-time tasks in 2D meshes

An on-line scheduling and allocation scheme for real-time ta...

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international symposium on parallel and distributed Processing (IPDPS)

作者： Seong-Moo Yoo Hee Yong Youn Dept. of Comput. Sci. Eng. Texas Univ. Arlington TX USA Department of Computer Science and Engineering University of Texas Arlington Arlington TX USA

ISBN: (纸本)0818671955

In hard real-time environment scheduling and allocation of sporadic tasks for multiprocessor systems is a challenging problem. In this paper, we propose an on-line scheduling and allocation scheme for real-time tasks which require the exclusive use of submeshes in 2D mesh system. By effectively manipulating the information on allocated or reserved submeshes, the proposed scheme can quickly identify the earliest available time of a free submesh for a newly-arrived task. We employ a preemption approach to reduce the complexity of the search for a feasible schedule. Computer simulation reveals that the proposed scheme significantly improves the system performance by decreasing the number of tasks rejected.

关键词： Processor scheduling Real time systems Multiprocessing systems Concurrent computing High performance computing Application software Topology Computer simulation Computer science System performance

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On integrating error detection into a fault diagnosis algorithm for massively parallel computers

On integrating error detection into a fault diagnosis algori...

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international Computer Performance and Dependability symposium

作者： J. Altmann T. Bartha A. Pataricza Department of Computer Science (IMMD) III University of Erlangen Nuremberg Erlangen Germany Department of Measurement and Instrumentation Engineering Technical University of Budapest Budapest Hungary

Scalable fault diagnosis is necessary for constructing fault tolerance mechanisms in large massively parallel multiprocessor systems. The diagnosis algorithm must operate efficiently even if the system consists of several thousand processors. We introduce an event-driven, distributed system-level diagnosis algorithm. It uses a small number of messages and is based on a general diagnosis model without the limitation of the number of simultaneously existing faults (an important requirement for massively parallel computers). The algorithm integrates both error detection techniques like messages, and built in hardware mechanisms. The structure of the implemented algorithm is presented and the essential program modules are described. The paper also discusses the use of test results generated by error detection mechanisms for fault localization. Measurement results illustrate the effect of the diagnosis algorithm, in particular the error detection mechanism by , messages, on the application performance.< >

关键词： Computer errors Fault detection Fault diagnosis Concurrent computing Fault tolerant systems Scalability Clustering algorithms Hardware Application software Instruments

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An efficient processor allocation scheme for mesh connected parallel computers

An efficient processor allocation scheme for mesh connected ...

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international symposium on parallel and distributed Processing (IPDPS)

作者： J. Upadhyay P. Mohapatra Department of Electrical and Computer Engineering Iowa State University Ames IA USA

Several processor allocation schemes are proposed in the literature for mesh connected parallel computers. All these schemes aim at improving the system performance by reducing internal fragmentation or by enhancing the submesh recognition ability. In this paper, we propose an approach of system partitioning to reduce external fragmentation and thereby improve the system performance. The target systems considered here are two-dimensional meshes where the side lengths are powers of two. Processors are allocated to a partitioned mesh based on their submesh size requirements. The proposed scheme can be implemented in conjuaction with any of the existing schemes and thereby can also exploit the advantages offered by those schemes. The performance measurements are done through simulation experiments. Completion time for a fixed number of jobs, internal and external fragmentation, and system utilazation are obtained. It is observed that, in most cases, the proposed scheme demonstrates better performance. Time complexity of the proposed scheme is less by a factor of n compared to the corresponding allocation scheme without partitioning, where n=log/sub 2.

关键词： Concurrent computing System performance Measurement Very large scale integration Application software Sorting Fast Fourier transforms Topology Partitioning algorithms

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Trace recovery: a distributed computing application for perturbation tracking

Trace recovery: a distributed computing application for pert...

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Proceedings of the 2nd IEEE international symposium on Requirements engineering

作者： Gannon, J.A. Williams, K.J. Andersland, M.S. Casavant, T.L. Univ of Iowa Iowa City United States

Execution monitoring plays a central role in most software development tools for parallel and distributed computer systems. However, such monitoring may induce delays that corrupt event timing. In this paper we introduce a perturbation analysis-like algorithm that, given a safe timed Petri net model of the monitored software, can recover the uncorrupted event timings, i.e., those that would have been observed had the delays not been present. Monitoring conditions sufficient to ensure correct operation of the algorithm, and examples illustrating the algorithm's applicability to message-passing systems are also presented. This work is part of a larger effort aimed at identifying cost-effective software alternatives to custom hardware monitoring.

关键词： Algorithms

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Characterization of applications with I/O for processor scheduling in multiprogrammed parallel systems

Characterization of applications with I/O for processor sche...

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international symposium on parallel and distributed Processing (IPDPS)

作者： S. Majumdar Yiu Ming Leung Systems and Computer Engineering Department Carleton University Ottawa Canada Optical Products Div. Corel Corporation Ottawa Canada

Most studies of processor scheduling in multiprogrammed parallel systems have ignored the I/O performed by applications. Recent studies have demonstrated that significant I/O operations are performed by a number of different classes of parallel applications. This paper focuses on some basic issues that underlie scheduling in multiprogrammed parallel environments running applications with I/O. Characterization of the I/O behavior of parallel applications is discussed first. Based on simulation models this research investigates the influence of these I/O characteristics on processor scheduling.< >

关键词： Processor scheduling Costs Application software Concurrent computing systems engineering and theory Message passing Hypercubes Hardware software tools Multiprocessing systems

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The virtual computing environment

The virtual computing environment

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international symposium on High Performance distributed Computing

作者： P. Rousselle P. Tymann S. Hariri G. Fox Northeast Parallel Architectures Center Department of Electrical and Computer Engineering Syracuse University Syracuse NY USA

A network of supercomputers and high-performance workstations appears to be the only reasonable way to provide adequate computing resources for the Grand Challenge problems of the next century. Such a collection of computers and supporting software environments is called a virtual computing environment (VCE). The paper describes the motivation and goals of the VCE project, followed by a description of the system. The paper concentrates on the runtime aspects of the VCE, and concludes with a discussion of a small prototype system that has been built using the Isis distributed toolkit.< >

关键词： Application software Supercomputers Programming profession Operating systems Workstations Computer networks distributed computing software tools Computer architecture parallel architectures

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Synchronization and communication in algorithmic structures

Synchronization and communication in algorithmic structures

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international symposium on parallel and distributed Processing (IPDPS)

作者： L.F. Wilson M.J. Gonzalez Computer Engineering Research Center University of Texas Austin Austin TX USA Motorola Corporate Software Research University of Texas Austin Research Grant USA

In high-performance computing, parallel and distributed systems enhance performance by devoting multiple processors to a single problem. However, the performance of such systems is often less than optimal due to synchronization problems, communication overhead I/O delays, and inefficient algorithms. This paper examines the effects of synchronization and communication on execution times for different categories of algorithmic structures. Our results show that the algorithmic structure used can have an impact on program execution time even when communication times are assumed to be zero. With non-zero communication times, the asynchronous and nearest-neighbor structures show relatively little performance degradation while the synchronous and asynchronous master-slave structures demonstrate a large decrease in performance. Finally, we present and evaluate theoretical bounds on execution time for these structures.< >

关键词： Concurrent computing distributed computing Equations High performance computing Delay Degradation Whales Master-slave Costs Random variables

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Automatic generation of parallel programs with dynamic load balancing

Automatic generation of parallel programs with dynamic load ...

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international symposium on High Performance distributed Computing

作者： B.S. Siegell P. Steenkiste Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA USA School of Computer Science Carnegie Mellon University Pittsburgh PA USA

Existing parallelizing compilers are targeted towards parallel architectures where all processors are dedicated to a single application. However a new type of parallel system has become available in the form of high performance workstations connected by high speed networks. Such systems pose new problems for compilers because the available processing power on each workstation may change with time due to other tasks competing for resources. We argue that it is possible for a parallelizing compiler to generate code that can dynamically shift portions of the application's workload between processors to improve performance. We have implemented a run-time system that supports automatically generated programs with dynamic load balancing. We describe this system and present performance measurements. We also describe the compiler functionality needed to generate parallel programs with dynamic load balancing.< >

关键词： Load management Workstations Program processors parallel languages Dynamic scheduling parallel architectures Application software High-speed networks Power generation Marine vehicles

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On exploiting declarative programming and parallel execution in computer based real-time systems

On exploiting declarative programming and parallel execution...

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international symposium and Workshop on systems engineering of Computer Based systems

作者： B. Lennartsson N. Shahmehri S. Bonnier Carlstedt Elektronik AB Partille Sweden

Presents experiences from modelling real-time applications in the declarative functional language H, developed hand-in-hand with a novel parallel graph reduction architecture called rp8601, both designed with the requirements of real-time embedded systems in mind. In rp8601, the analogue and digital interactions with the environment have been designed into the chips and into the language, and so have mechanisms to handle time constraints. Traditionally, declarative programming means that the programmer need not be aware of the processor operations. Instead, he can focus on the abstract relations between the input and output streams. The specific real-time requirements have normally not been taken into account in the declarative view. Our conclusion is that declarative functional programming is a viable technique for the development of complex software for embedded real-time systems. However, considerable efforts have to be spent on educating and training the application programmers in the new programming paradigm.< >

关键词： parallel programming Concurrent computing Real time systems Programming profession parallel processing Hardware Application software distributed computing Computer industry Time factors

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A comparison of techniques used for mapping parallel algorithms to message-passing multiprocessors

A comparison of techniques used for mapping parallel algorit...

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international symposium on parallel and distributed Processing (IPDPS)

作者： M.D. Dikaiakos K. Steiglitz A. Rogers Departments of Astronomy and Computer Science-Engineering University of Washington USA Department of Computer Science Princeton University USA

This paper presents a comparison study of popular clustering and mapping heuristics which are used to map task-flow graphs to message-passing multiprocessors. To this end, we use task-graphs which are representative of important scientific algorithms running on data-sets of practical interest. The annotation which assigns weights to nodes and edges of the task-graphs is realistic. It reflects current trends in processor, communication channel, and message-passing interface technology and takes into consideration hardware characteristics of state-of-the-art multiprocessors. Our experiments show that applying realistic models for task-graph annotation affects the effectiveness and functionality of clustering and mapping techniques. Therefore, new heuristics are necessary that will take into account more practical models of communication costs. We present modifications to existing clustering and mapping algorithms which improve their efficiency and running-time for the practical models adopted.< >

关键词： parallel algorithms Clustering algorithms Hardware Concurrent computing Costs Processor scheduling Astronomy Computer science Communication channels software systems

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