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On distributed security transaction that use secure transport protocol 16

On distributed security transaction that use secure transpor...

引用

16th IEEE computer Security Foundations Workshop, CSFW 2003

作者： Broadfoot, P. Lowe, G. Oxford University Computing Laboratory Wolfson Building Parks Road OxfordOX1 3QD United Kingdom

ISBN: (纸本)076951927X

In this paper, we consider techniques for designing and analyzing distributed security transactions. We present a layered approach, with a high-level security transaction layer running on top of a lower-level secure transport protocol. the secure transport protocol provides protection against dishonest outsiders, while the transaction layer can be designed to provide protection against dishonest insiders. We specify generic services that one might expect such secure transport protocols to provide. We give examples of this layered approach, with the aim of demonstrating that the separation of concerns allows for a cleaner, more intuitive design. We consider how to analyze such a layered security architecture. © 2003 IEEE.

关键词： Grid computing

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Time Warp cancellation optimizations on high latency networks 7

Time Warp cancellation optimizations on high latency network...

引用

7th IEEE International symposium on Distributed Simulation and Real-Time Applications, DS-RT 2003

作者： Iskra, K.A. Van Albada, G.D. Sloot, P.M.A. Section Computational Science Faculty of Science Universiteit Van Amsterdam Kruislaan 403 Amsterdam1098 SJ Netherlands

ISBN: (纸本)0769520367

We investigate the performance of the time warp kernel APSIS when running on various communication layers, in particular on a wide-area grid. Several cancellation strategies are tried, among them the lazy cancellation and a little known bulk anti-messages optimization. Our experiments with an Ising spin simulation indicate that the slowdown caused by high latency networks, while significant, is not catastrophic;and that it can be significantly reduced using the lazy cancellation. Experiments suggest that further improvements can be expected if a more elaborate communication infrastructure is put in place. © 2003 IEEE.

关键词： Grid computing

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Work distribution for parallel ZSweep algorithm 16

Work distribution for parallel ZSweep algorithm

引用

16th Brazilian symposium on computer Graphics and Image Processing

作者： Farias, R Bentes, C Coelho, A Guedes, S Gonçalves, L Natl Lab Sci Comp LNCC Petropolis RJ Brazil

ISBN: (纸本)0769520324

Distributed systems such as clusters of PCs are low-cost alternatives for running parallel rendering systems, but they have high communication overhead, and limited memory capacity on each processing node. In this paper, we focus on the strategy for distributing the parallel rendering work among the PCs. A good distribution strategy provides better load balance, and avoids the need for replicating data on the relatively small memory of each PC. Our goal is to study different distribution strategies on the scope of the Parallel ZSweep algorithm, introducing in PZSweep another work distribution strategy: work stealing. this strategy allows a decentralized control of the work to be done, and provides a dynamic load redistribution. We propose two different algorithms to select the processor that will be "stolen" and show that the simplest one, nearest neighbor, was the most efficient. We also showed that the load redistribution schemes strongly depended on the initial load distribution, with an interleaved assignment, our systems could outperform the original Parallel ZSweep algorithm. We conclude that for running large datasets on a cluster of PCs, Parallel ZSweep requires dynamic load distribution strategy.

关键词： Automation Clustering algorithms Costs Distributed control Distribution strategy Laboratories Nearest neighbor searches Personal communication networks Scientific computing Systems engineering and theory

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Fast parallel FFT on a reconfigurable computation platform

Fast parallel FFT on a reconfigurable computation platform

引用

International symposium on computer architecture and high performance computing (SBAC-PAD)

作者： A.H. Kamalizad C. Pan N. Bagherzadeh EECS Department University of California Irvine Irvine CA USA

We present implementation of a very fast parallel complex FFT on M2, the second generation of MorphoSys reconfigurable computation platform, which is targeting on streamed applications such as multimedia and DSP. the proposed mapping comprises fast presorting, cascaded radix-2 stages, and postreordering. Data and twiddle factors are 16-bit real and 16-bit imaginary in 2's complement format and scaling is performed to avoid overflow. the mapping is tested on our cycle-accurate simulator, "mulate", and the performance is encouragingly better than other architectures such as Imagine and VIRAM. Moreover, the performance is scalable according to FFT sizes. Since there is no functionality specifically tailored to FFT, the results demonstrate the capability of MorphoSys architecture to extract parallelism from streamed applications. Further rationales are given based on the concepts of scalar operand networks and memory hierarchy.

关键词： Concurrent computing Streaming media computer architecture Application software Application specific integrated circuits Digital signal processing Parallel processing Scalability Delay Bandwidth

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RZSweep: A new hardware-assisted volume-rendering technique for regular datasets 16

RZSweep: A new hardware-assisted volume-rendering technique ...

引用

16th Brazilian symposium on computer Graphics and Image Processing

作者： Chaudhary, G Ramaswamy, L Farias, R Univ Calif Irvine Irvine CA 92717 USA

ISBN: (纸本)0769520324

A long-standing challenge in the field of volume rendering is to obtain high quality images in near real-time. this is particularly important for scientific datasets where highly precise results are required to ensure accurate data interpretation. this paper presents RZSweep as a new hardware-assisted technique for volume rendering of regular datasets based on the plane-sweep paradigm. Although some research has been done in the past for irregular datasets, this paper presents the first attempt to explore the capabilities of the plane sweep paradigm for regular datasets. RZSweep is an exact, object order, direct volume rendering (DVR), back-to-front projection algorithm wherein a plane sweeps through the volume in depth order, projecting all the data elements within the user specified threshold onto the image plane. the algorithm uses a hardware rendering pipeline to composite the final image. the space complexity of the algorithm is bound to the number of vertices in the largest diagonal plane of the dataset. A prototype of the algorithm renders a dataset of size 256 3 in near real-time of 0.77 seconds on a single off-the-shelf commodity hardware PC. Every data element within the specified threshold contributes to the final image in its correct spatial order that is guaranteed by the use of a heap.

关键词： Computed tomography Data visualization Hardware Laboratories Lattices Magnetic resonance imaging Positron emission tomography Rendering (computer graphics) Scientific computing Transfer functions

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high bandwidth scientific data management using storage area networking: Lessons learned at the starfire optical range 20

High bandwidth scientific data management using storage area...

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20th IEEE Conference on Mass Storage Systems and Technology/11th NASA Goddard Conference on Mass Storage Systems and Technology

作者： Duncan, TS Sichler, MS USAF Res Lab Kirtland AFB NM 87117 USA

ISBN: (纸本)0769519148

Advances in sensor technology, electronic devices, digital processing hardware, and computation systems have vastly increased the volume of data available for collection at scientific research sites. the Starfire Optical Range of the Air Force Research Laboratory Directed Energy Directorate is responsible for the research and development of advanced techniques for atmospheric compensation for large telescopes. Recent experiments have been completed which encompassed more that 100TB of collected data. the collection, processing, archival, and analysis of these data required an entirely new approach for the facility staff. this paper presents the architecture, hardware and software components, integration difficulties, and performance results in a "lessons learned" format focused on specific implementation choices, interoperability lessons and issues, and results and capabilities.

关键词： Bandwidth computer network management Force sensors Hardware Laboratories Military computing Optical fiber networks Optical sensors Research and development Sensor systems

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high-radix iterative algorithm for powering computation

High-radix iterative algorithm for powering computation

引用

computer Arithmetic (ARIth)

作者： J.-A. Pineiro M.D. Ercegovac J.D. Bruguera Department of Electronic and Computer Engineering University of Santiago de Compostela Spain Computer Science Department University of California Los Angeles USA

A high-radix composite algorithm for the computation of the powering function (X/sup Y/) is presented. the algorithm consists of a sequence of overlapped operations: (i) digit-recurrence logarithm, (ii) left-to-right carry-free (LRCF) multiplications, and (iii) online exponential. A redundant number system is used, and the selection in (i) and (iii) is done by rounding except from the first iteration, when selection by table look-up is necessary to guarantee the convergence of the recurrences. A sequential implementation of the algorithm is proposed, and the execution times and hardware requirements are estimated for single and double-precision floating-point computations, for radix r=128, showing that powering can be computed with similar performance as high-radix CORDIC algorithms.

关键词： Iterative algorithms Signal processing algorithms Character generation Power engineering computing high performance computing Convergence Hardware Application software computer graphics Delay

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X4CP32: a new parallel/reconfigurable general-purpose processor

X4CP32: a new parallel/reconfigurable general-purpose proces...

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International symposium on computer architecture and high performance computing (SBAC-PAD)

作者： R. Soares A. Azevedo I.S. Silva Departamento de Informática e Matemática Aplicada Universidade Federal do Rio Grande do Norte Brazil

the X4CP32 is a parallel/reconfigurable microprocessor with 2 programming levels. Although it is a general-purpose microprocessor, it has the reliable performance of a reconfigurable architecture. We expose its architecture and programming levels, and discuss the powerful interaction between parallel programming and reconfiguration. It shows two performance-optimized implementations of matrix multiplication using both parallel and reconfigurable paradigms and a parallel implementation of miner intelligent agents.

关键词： computer architecture high performance computing Communication system control Access protocols Communication channels Parallel programming Parallel processing Process control Routing Buildings

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On the implementation of SPMD applications using Haskell/sub #/

On the implementation of SPMD applications using Haskell/sub...

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International symposium on computer architecture and high performance computing (SBAC-PAD)

作者： F.H. de Carvalho R.D. Lins N.C. Quental Escola Politécnica de Pernambuco Universidade de Pernambuco Recife Brazil Departamento de Eletrônica e Sistemas Universidade Federal de Pernambuco Recife Brazil

Commodities-built clusters, a low cost alternative for distributed parallel processing, brought high-performance computing to a wide range of users. However, the existing widespread tools for distributed parallel programming, such as messaging passing libraries, does not attend new software engineering requirements that have emerged due to increase in complexity of applications. Haskell/sub #/ is a parallel programming language intending to reconcile higher abstraction and modularity with scalable performance. It is demonstrated the use of Haskell/sub #/ in the programming of three SPMD benchmark programs, which have lower-level MPI implementations available.

关键词： Parallel programming Parallel processing Concurrent computing Costs Programming profession computer architecture Distributed computing Software libraries Software engineering Application software

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Load balancing on stateful clustered Web servers

Load balancing on stateful clustered Web servers

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International symposium on computer architecture and high performance computing (SBAC-PAD)

作者： G. Teodoro T. Tavares B. Coutinho W. Meira D. Guedes Department of Computer Science Universidade Federal de Minas Gerais Belo Horizonte Minas Gerais Brazil

One of the main challenges to the wide use of the Internet is the scalability of the servers, that is, their ability to handle the increasing demand. Scalability in stateful servers, which comprise e-commerce and other transaction-oriented servers, is even more difficult, since it is necessary to keep transaction data across requests from the same user. One common strategy for achieving scalability is to employ clustered servers, where the load is distributed among the various servers. However, as a consequence of the workload characteristics and the need of maintaining data coherent among the servers that compose the cluster, load imbalance arise among servers, reducing the efficiency of the server as a whole. We propose and evaluate a strategy for load balancing in stateful clustered servers. Our strategy is based on control theory and allowed significant gains over configurations that do not employ the load balancing strategy, reducing the response time in up to 50% and increasing the throughput in up to 16%.

关键词： Load management Web server Scalability World Wide Web Internet computer architecture computer science Control theory Delay throughput

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