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检索条件"任意字段=Proceedings of the Third IEEE Symposium on Parallel and Distributed Processing"

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Exploiting dataflow to extract Java instruction level parallelism on a tag-based multi-issue semi in-order (TMSI) processor 06

Exploiting dataflow to extract Java instruction level parall...

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International symposium on parallel and distributed processing (IPDPS)

作者： Hai-Chen Wang Chung-Kwong Yuen Department of Computer Science School of Computing National University of Singapore Singapore

ISBN: (纸本)9781424400546

To design a Java processor with traditional modern processor architecture, the instruction level parallelism (ILP) is not readily exploitable due to stack operands dependencies. This paper presents a dataflow-based instruction tagging scheme. With instruction tagging, the independent bytecode instruction groups with stack dependences are identified. The different bytecode instruction group can be executed in parallel because there are no stack dependences among them. With the instruction tagging scheme, we propose a tag-based multi-issue semi-in-order (TMSI) Java processor. The processor takes advantage of instruction-tagging and stack-folding to generate the tagged register-based instructions. When the tagged instructions are ready, they are bundled out-of-order depending on data availability to form VLIW-like instruction words and issued in-order. To achieve high performance, a VLIW engine is employed. We have conducted some experiments in our TMSI simulation environment using SPECjvm98 and Linpack workload. The results indicate that the proposed processor has good performance gain

关键词： Java Hardware Yarn Tagging parallel processing Process design VLIW Virtual machining Virtual manufacturing Computer science

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A parallel exact hybrid approach for solving multi-objective problems on the computational grid 06

A parallel exact hybrid approach for solving multi-objective...

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International symposium on parallel and distributed processing (IPDPS)

作者： M. Mezmaz N. Melab E.-G. Talbi Laboratoire dInformatique Fondamentale de Lille INRIA-Futurs-DOLPHIN Project Villeneuve d'Ascq France

ISBN: (纸本)9781424400546

This paper presents a parallel hybrid exact multi-objective approach which combines two metaheuristics - a genetic algorithm (GA) and a memetic algorithm (MA), with an exact method - a branch and bound (B&B) algorithm. Such approach profits from both the exploration power of the GA, the intensification capability of the MA and the ability of the B&B to provide optimal solutions with proof of optimality. To fully exploit the resources of a computational grid, the hybrid method is parallelized according to three well-known parallel models - the island model for the GA, the multi-start model for the MA and the parallel tree exploration model for the B&B. The obtained method has been experimented and validated on a bi-objective flow-shop scheduling problem. The approach allowed to solve exactly for the first time an instance of the problem - 50 jobs on 5 machines. More than 400 processors belonging to 4 administrative domains have contributed to the resolution process during more than 6 days

关键词： Concurrent computing Grid computing Optimization methods Dolphins Genetic algorithms Processor scheduling parallel processing Convergence Search methods Robustness

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Free network measurement for adaptive virtualized distributed computing 06

Free network measurement for adaptive virtualized distribute...

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International symposium on parallel and distributed processing (IPDPS)

作者： A. Gupta M. Zangrilli A.I. Sundararaj A.I. Huang P.A. Dinda B.B. Lowekamp Department of Electrical Engineering and Computer Science Northwestern University Evanston IL USA Computer Science Department College of William and Mary Williamsburg VA USA

ISBN: (纸本)9781424400546

An execution environment consisting of virtual machines (VMs) interconnected with a virtual overlay network can use the naturally occurring traffic of an existing, unmodified application running in the VMs to measure the underlying physical network. Based on these characterizations, and characterizations of the application's own communication topology, the execution environment can optimize the execution of the application using application-independent means such as VM migration and overlay topology changes. In this paper, we demonstrate the feasibility of such free automatic network measurement by fusing the Wren passive monitoring and analysis system with Virtuoso's virtual networking system. We explain how Wren has been extended to support online analysis, and we explain how Virtuoso's adaptation algorithms have been enhanced to use Wren's physical network level information to choose VM-to-host mappings, overlay topology, and forwarding rules

关键词： Adaptive systems distributed computing Network topology Voice mail Virtual machining Telecommunication traffic Virtual manufacturing Computerized monitoring Information analysis Algorithm design and analysis

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Towards building a highly-available cluster based model for high performance computing 06

Towards building a highly-available cluster based model for ...

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International symposium on parallel and distributed processing (IPDPS)

作者： A. Boukerche R. Al-Shaikh M.S.M. Notare PARADISE Research Laboratory SITE University of Ottawa Canada PARADISE Research Laboratory Barddal University Brazil

ISBN: (纸本)9781424400546

In recent years, we have witnessed a growing interest in high performance computing (HPC) using a cluster of workstations. However, many challenges remain to be resolved before these systems become dependable. One of the challenges in a clustered environment is to keep system failure to the minimum level and while achieving the highest possible level of system availability. High-availability (HA) computing attempts to avoid the problems of unexpected failures through active redundancy and preemptive measures. In this paper, we propose to build HA-clusters based model for high performance computing. Our model is based on combination of both HPC and HA concepts, we also propose to investigate further the hardware and the management layers of the HA-HPC cluster design, and the parallel-applications layer (i.e. FT-MPI implementations). In this work, we focus upon the latter layer. We discuss our model, and present our simulation experiments we have carried out to evaluate our proposed model.

关键词： High performance computing Hardware Availability Supercomputers Fault tolerance distributed computing Laboratories Workstations Redundancy Computational modeling

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Multi-clock pipelined design of an ieee 802.11a physical layer transmitter 06

Multi-clock pipelined design of an IEEE 802.11a physical lay...

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International symposium on parallel and distributed processing (IPDPS)

作者： M. Mizani D. Rakhmatov Department of Electrical and Computer Engineering University of Victoria Victoria BC Canada

ISBN: (纸本)9781424400546

Among different wireless LAN technologies 802.11a has recently become popular due to its high throughput, large system capacity, and relatively long range. In this paper, we propose a reconfigurable architecture for the 802.11a physical layer transmitter, which has low latency and low power consumption due to its pipelined structure. Data from the MAC layer can continuously flow through the pipeline without excessive buffering and handshaking within the physical layer. Dynamically reconfiguring this architecture to work at any data rate supported by 802.11a (eight different modes) can be performed within a few cycles, simply by adjusting the period of two clock signals and changing the value of a 3-bit control signal. Our architecture, prototyped on a Xilinx Virtex-II Pro FPGA, occupies the area of 2059 slices and is estimated to consume 500 mW. These figures can be improved substantially in custom ASIC implementations

关键词： Physical layer Transmitters Wireless LAN Throughput Reconfigurable architectures Delay Energy consumption Pipelines Clocks Prototypes

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A distributed method for dynamic resolution of BGP oscillations 06

A distributed method for dynamic resolution of BGP oscillati...

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International symposium on parallel and distributed processing (IPDPS)

作者： E. Ahronovitz J.-C. Konig C. Saad LIRMM Université Montpellier Montpellier France

ISBN: (纸本)9781424400546

Autonomous systems (AS) in the Internet use different protocols for internal and external routing. BGP is the only external protocol. It allows ASes to define their own routing policy independently. Many papers cited in reference deal with a divergence behavior due to this flexibility. In fact, when routing policies are not conflicting, BGP is self-stabilising, which means that whatever the network configuration, BGP converges to a stable solution. Unfortunately, as experienced on the Internet, AS routing policies may be uncoherent, thus generating oscillations. In this paper, we propose a distributed dynamic method for detecting and solving oscillations of BGP. It respects private policy choices and requires only a few low level constraints in order to converge to a stable solution. Essentially, a router has to maintain only local path stateful information to detect instabilities. In this case, it generates and launches a token linked to a route. Each router makes the decision to forward or not the token according to local data and local policy. If the originating router receives back the token, then it marks the route as barred. Nevertheless, routes may furtherly be unmarked. Finally, we express and define what coherence between routing policies means

关键词： Internet Routing protocols History Stability Degradation Guidelines

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Executing MPI programs on virtual machines in an Internet sharing system 06

Executing MPI programs on virtual machines in an Internet sh...

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International symposium on parallel and distributed processing (IPDPS)

作者： Zhelong Pan Xiaojuan Ren R. Eigenmann Dongyan Xu School of Electrical and Computer Engineering Purdue University West Lafayette IN USA Department of Computer Science Purdue University West Lafayette IN USA

ISBN: (纸本)9781424400546

Internet sharing systems aim at federating and utilizing distributed computing resources across the Internet. This paper presents a user-level virtual machine (VM) approach to MPI program execution in an Internet sharing framework. In this approach, the resource consumer has its own operating system running on top of and isolated from, the operating system of the resource provider. We propose an efficient socket virtualization technique to optimize VM network performance. Socket virtualization achieves the same network bandwidth as the physical network. In our LAN environment, it reduces the latency overhead from 112% (using existing TUN/TAP technique) to 35.6%. Performance results on MPI benchmarks show that our virtualization technique incurs small overhead compared with the physical host platform, while gaining in return a higher degree of guest isolation and customization. We also describe the key mechanisms that allow the employment of VMs in an existing Internet sharing system

关键词： Virtual machining Internet Virtual manufacturing Operating systems Sockets distributed computing Bandwidth Local area networks Delay Platform virtualization

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A parallel memetic algorithm applied to the total tardiness machine scheduling problem

A parallel memetic algorithm applied to the total tardiness ...

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International symposium on parallel and distributed processing (IPDPS)

作者： V.J. Garcia P.M. Franca Ad.S. Mendes P. Moscato Faculdade de Engenharia Elétrica e de Computação Universidade Estadual de Campinas Campinas SP Brazil School of Electrical Engineering and Computer Science The University of Newcastle Callaghan NSW Australia

This work proposes a parallel memetic algorithm applied to the total tardiness single machine scheduling problem. Classical models of parallel evolutionary algorithms and the general structure of memetic algorithms are discussed. The classical model of global parallel genetic algorithm was used to model the global parallel memetic analogue where the parallelization is only applied to the individual optimization phase of the algorithm. Computational tests show the efficiency of the parallel approach when compared to the sequential version. A set of eight instances, with sizes ranging from 56 up to 323 jobs and with known optimal solutions, is used for the comparisons.

关键词： Scheduling algorithm Single machine scheduling Concurrent computing Algorithm design and analysis Processor scheduling Genetic algorithms Job shop scheduling Computer science Australia Sequential analysis

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parallel calculation of volcanoes for cryptographic uses 06

Parallel calculation of volcanoes for cryptographic uses

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International symposium on parallel and distributed processing (IPDPS)

作者： S. Martinez R. Tomas C. Roig M. Valls R. Moreno Department dInformàtica i Enginyería Industrial Universitat de Lleida Lleida Spain Department de Matemàtica Universitat de Lleida Lleida Spain

ISBN: (纸本)9781424400546

Elliptic curve crypto systems are nowadays widely used in the design of many security devices. Nevertheless, since not every elliptic curve is useful for cryptographic purposes, mechanisms for providing good curves are highly needed. The generation of the volcano graph of elliptic curves can help to provide such good curves. However, this procedure turns out to be very expensive when performed sequentially. Hence, a parallel application for the calculation of such volcano graphs is proposed in this paper. In order to obtain high efficiency, a theoretical analysis is provided for obtaining an accurate granularity and for giving the appropriate number of tasks to be created. Experimental results show the benefits obtained in the speedup when executing the application in a cluster of workstations with message-passing for the generation of different volcano graphs. By the use of simulation, we study the scalability of the implementation and show that a speedup of more than 80 can be achieved in some cases

关键词： Volcanoes Elliptic curve cryptography Elliptic curves Workstations Scalability Mobile communication Communication system security Smart cards Authentication Bandwidth

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A framework to develop symbolic performance models of parallel applications 06

A framework to develop symbolic performance models of parall...

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International symposium on parallel and distributed processing (IPDPS)

作者： S.R. Alam J.S. Vetter Oak Ridge National Laboratory Oak Ridge TN USA

ISBN: (纸本)9781424400546

Performance and workload modeling has numerous uses at every stage of the high-end computing lifecycle: design, integration, procurement, installation and tuning. Despite the tremendous usefulness of performance models, their construction remains largely a manual, complex, and time-consuming exercise. We propose a new approach to the model construction, called modeling assertions (MA), which borrows advantages from both the empirical and analytical modeling techniques. This strategy has many advantages over traditional methods: incremental construction of realistic performance models, straightforward model validation against empirical data, and intuitive error bounding on individual model terms. We demonstrate this new technique on the NAS parallel CG and SP benchmarks by constructing high fidelity models for the floating-point operation cost, memory requirements, and MPI message volume. These models are driven by a small number of key input parameters thereby allowing efficient design space exploration of future problem sizes and architectures

关键词： Mathematical model Character generation Communication system control High performance computing Predictive models Procurement Analytical models Costs Space exploration Performance analysis

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