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15 Workshops Held in Conjunction with the IEEE International parallel and Distributed Processing Symposium, IPDPS 2000

作者： Stanzione Jr., Daniel C. Ligon III, Walter B. Parallel Architecture Research Lab. Clemson University United States

ISBN: (纸本)354067442X

This paper presents the status of an ongoing project in constructing a framework to create problem solving environments (PSEs). The framework is independent of any particular architecture, programming model, or problem domain. The framework makes use of compiler technology, but identifies and addresses several key differences betw een compilers and PSE. The validit y of this model is being tested through the creation of several protot ype PSEs, which apply to significantly differen t domains, and target both parallel computers and reconfigurable computers. © 2000 Springer-Verlag Berlin Heidelberg.

关键词： Problem solving

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Evaluation of futurebus+ for a GMMP multiprocessor 4

Evaluation of futurebus+ for a GMMP multiprocessor

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4th International Conference on Computing and Information, ICCI 1992

作者： Johnson, Eric E. Moore, Roy S. Poison, John T. Parallel Architecture Research Lab New Mexico State University United States

ISBN: (纸本)081862812X

One of the most popular approaches for increasing computer performance is parallel computations using specialized hardware. Clearly, we would like to use standardized technology wherever possible in such multiprocessors, in order to minimize the number of unique components that must be (re)designed for each generation of the machine. This paper presents the result of a modeling study that was undertaken to estimate the performance achievable by an implementation of the Virtual Port Memory multiprocessor architecture using the Futurebus+ backplane bus structure. Discrete event simulation and analytical queueing network models concur that peak performance occurs, for typical workloads, at approximately 30 processors on the bus. ©1992 IEEE.

关键词： Discrete event simulation

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Support for parallel out of core applications on Beowulf workstations

Support for parallel out of core applications on Beowulf wor...

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1998 IEEE Aerospace Conference, AERO 1998

作者： Cettei, Matthew M. Ligon, Walter B. Ross, Robert B. Parallel Architecture Research Lab Clemson University 102 Riggs Hall ClemsonSC29634-0915 United States

ISBN: (纸本)0780343115

Beowulf workstations are a new approach to parallel computing that combine the characteristics of the Pile-Of-PC architecture with freely available software and provide high performance at a low cost for many applications. In order to provide this performance in the face of increasing problem sizes, efficient out of core (OOC) methods must be investigated. In light of shortcomings in operating system virtual memory performance, we have implemented a parallel file system and a new interface tailored to OOC algorithms to provide efficient and convenient access to disk resources in Beowulf workstations. This paper focuses on how these components extend the range of problem sizes which can be efficiently solved on Beowulf workstations in the context of a sample application, a Gauss-Seidel iterative solver. Execution times of the solver when using traditional virtual memory and the parallel file system are compared to characterize performance for various problem sizes, and it is concluded that the combination of parallel file system and new interface significantly increases the size of problems that can be efficiently solved. © 1998 IEEE.

关键词： Piles

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Fretting wear mechanism of GH4169 dovetail joint specimens treated with hybrid laser shock peening

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Tribology International 2025年 209卷

作者： Fang, Xiuyang Wang, Zheng Wahab, Magd Abdel Gong, Jianen Liu, Xiong Liu, Xing Cai, Zhenbing School of Mechanical Engineering Southwest Jiaotong University Chengdu610031 China Tribology Research Institute Key Lab of Advanced Technologies of Materials Southwest Jiaotong University Chengdu610031 China Soete Laboratory Department of Electrical Energy Metals Mechanical Constructions and Systems Faculty of Engineering and Architecture Ghent University Gent9000 Belgium College of Engineering Yuan Ze University Taiwan China Parallel and Distributed Systems Laboratory Jožef Stefan Institute Jamova cesta 39 LjubljanaSI-1000 Slovenia DongFang Electric Machinery Co. LTD Deyang618000 China State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Hubei Wuhan430074 China

Aero engine blade structure is prone to severe fretting wear under centrifugal forces and vibration loads, resulting in greatly reduced engine service life, which is a typical fretting damage problem. In this paper, without Absorbing layer Nanosecond Laser Shock Peening (wAN-LSP) and without Absorbing layer Nanosecond superimposed Femtosecond hybrid Laser Shock Peening (NF-LSP) are utilized to strengthen the surface of GH4169 dovetail joint specimens, which is a common material for engine blades, to explore its strengthening mechanism and fretting wear evolution law. The findings indicate that the surface roughness of the wAN-LSP specimen rises from 0.28 μm to 1.16 μm. The thermal effects of wAN-LSP lead to the formation of a molten layer roughly 10.97 μm thick on the surface, accompanied by numerous pits, ablation holes, and micro-cracks. In contrast, NF-LSP treatment effectively eliminates the surface oxidation defects made by the thermal effects of wAN-LSP, leading to a slight decrease in surface roughness. Both wAN-LSP and NF-LSP treatments enhance the surface hardness of the specimens, creating a plastic deformation layer roughly 400 μm deep, but the near surface hardness of NF-LSP treated specimen is further improved compared to that of the wAN-LSP specimen. The wear mechanism observed in the GH4169 dovetail joint specimens following wAN-LSP and NF-LSP treatment are identified as abrasive wear and oxidation wear. Initially, as the number of cycles raises, the wear volume of GH4169 specimen treated with wAN-LSP is higher than that of untreated specimen, but subsequently, it becomes lesser than that of the untreated specimen. This phenomenon results from the interplay between the molten layer and hardened layer. In the initial stage of wear, despite the surface strengthening of the wAN-LSP specimen, the presence of molten layer significantly diminishes the fretting wear resistance of the material. As wear progresses, the molten layer is removed, revealing the be

关键词： Abrasion

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A reconfigurable extension to the network interface of beowulf clusters

A reconfigurable extension to the network interface of beowu...

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2001 IEEE International Conference on Cluster Computing, CLUSTER 2001

作者： Underwood, Keith D. Sass, Ron R. Ligon, Walter B. Parallel Architecture Research Lab Holcombe Department of Electrical and Computer Engineering Clemson University 105 Riggs Hall ClemsonSC29634-0915 United States

ISBN: (纸本)0769511163

With a focus on commodity PC systems, Beowulf clusters traditionally lack the cutting edge network architectures, memory subsystems, and processor technologies found in their more expensive supercomputer counterparts. What Beowulf clusters lack in technology, they more than make up for with their significant cost advantage over traditional supercomputers. We propose an architectural extension that adds reconfigurable computing to the network interface of Beowulf clusters. This enhances both the network and processor capabilities of the cluster. Furthermore, for some applications, the proposed extension partially compensates for weaknesses in the PC memory subsystem. We discuss two applications, the 2D Fast Fourier Transform (FFT) and integer sorting, which benefit from the resulting architecture. © 2001 Institute of Electrical and Electronics Engineers Inc.. All rights reserved.

关键词： Supercomputers

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Cost Effectiveness of an Adaptable Computing Cluster 01

Cost Effectiveness of an Adaptable Computing Cluster

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2001 ACM/IEEE Conference on Supercomputing, SC 2001

ISBN: (纸本)158113293X

With a focus on commodity PC systems, Beowulf clusters traditionally lack the cutting edge network architectures, memory subsystems, and processor technologies found in their more expensive supercomputer counterparts. What Beowulf clusters lack in technology, they more than make up for with their significant cost advantage over traditional supercomputers. This paper presents the cost implications of an architectural extension that adds reconfigurable computing to the network interface of Beowulf clusters. A quantitative idea of cost-effectiveness is formulated to evaluate computing technologies. Here, cost-effectiveness is considered in the context of two applications: the 2D Fast Fourier Transform (2D-FFT) and integer sorting. © 2001 ACM.

关键词： Cost effectiveness

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Reconfigurable mapping functions for online architectures

Reconfigurable mapping functions for online architectures

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International parallel and Distributed Processing Symposium, IPDPS 2003

作者： Harinath, Shyamnath Sass, Ron Parallel Architecture Research Lab Holcombe Department of Electrical and Computer Engineering Clemson University 105 Riggs Hall ClemsonSC29634-0915 United States

ISBN: (纸本)0769519261

Content addressable memory is an expensive component in fixed architecture systems however it may prove to be a valuable tool in online architectures (that is, run-time reconfigurable systems with an online decision algorithm to determine the next reconfiguration). In this paper we define a related problem called an arbitrary mapping function and describe an online architecture. We look at four implementations of an arbitrary mapping function component and compare them in terms of space (number of CLB used), reconfiguration time, and component latency. All of the implementations offer low latency;which is the primary reason to use a content addressable memory or an arbitrary mapping function. Three of the implementations trade large size for very fast reconfiguration while the last implementation is extremely conservative in space but has a large reconfiguration time. © 2003 IEEE.

关键词： Mapping

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Acceleration of a 2D-FFT on an Adaptable Computing Cluster 9

Acceleration of a 2D-FFT on an Adaptable Computing Cluster

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9th Annual IEEE Symposium on Field-Programmable Custom Computing Machines, FCCM 2001

作者： Underwood, K.D. Sass, R.R. Ligon, W.B. Parallel Architecture Research Lab. Holcombe Department of Electrical and Computer Engineering Clemson University 105 Riggs Hall ClemsonSC29634-0915 United States

ISBN: (纸本)0769526675

Despite a decade of research into their use for computing applications, FPGA-based custom computing machines are still only used to accelerate a limited range of applications. Recognizing that recent advances in network technology provide an opportunity for a more general-purpose application of custom computing machines, we develop the idea of an intelligent network adapter for cluster-based parallel computing, calling the resulting architecture an Adaptable Computing Cluster. Results presented suggest that placing the FPGAs in the data path to the network dramatically improves the performance and scalability of target applications. This is especially noteworthy because the target applications have historically not performed well on either technology. This paper discusses how FPGAs can be used to provide network functionality while increasing compute power. The focus is on a specific application, the 2D Fast Fourier Transform, with additional insights into the implications for parallel computing on a cluster. © 2001 Non IEEE.

关键词： Field programmable gate arrays (FPGA)

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Support for parallel out of core applications on Beowulf workstations

Support for parallel out of core applications on Beowulf wor...

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IEEE Conference on Aerospace

作者： M.M. Cettei W.B. Ligon R.B. Ross Parallel Architecture Research Lab Clemson University Clemson SC USA

关键词： Workstations File systems Application software parallel processing Computer architecture Software performance Costs Operating systems Iterative algorithms Gaussian processes

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The component-based environment for remote sensing

The component-based environment for remote sensing

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2002 IEEE Aerospace Conference

作者： Debardeleben, Nathan A. Ligon, Waltcr B. Stanzione, Dan C. Parallel Architecture Research Lab Dept. of Electr. and Comput. Eng. Clemson Univ. 105 Riggs Hall Clcmson SC 29634-0915 United States

ISBN: (纸本)078037231X

As the quality and accuracy of remote sensing instruments available improves., the ability to quickly process remotely sensed data is in increasing demand. A side effect of this increased quality and accuracy is a tremendous increase in the amount of computational power required by modern remote sensing applications. In this work, a problem solving environment for parallel computing named the component-based environment for remote sensing (CERSe) is proposed. CERSe's runtime engine and graphical user interface are presented. Performance results with and without USC of a parallel file system are given which show near linear speedup can be achieved through I/O tuning. © 2002 IEEE.

关键词： Remote sensing

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