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Performance predictions on implicit communication systems

Performance predictions on implicit communication systems

引用

international symposium on parallel and distributed Processing (IPDPS)

作者： Xiaodong Zhang Zhichen Xu Lin Sun High Performance Computing and Software Laboratory University of Texas San Antonio San Antonio TX USA

ISBN: (纸本)0818664274

this paper presents a multiprocessor performance prediction methodology supported by experimental measurements, which predicts the execution time of large application programs on large parallel architectures based on a small set of sample data. We propose a graph model to describe application program behavior. Important and implicit architecture parameters are obtained by experiments. We focus on performance predictions of application programs on multiprocessors with implicit communications. A large scientific simulation program is implemented using the shared-memory model on the KSR-1 and using the data-parallel model on the CM-5 for performance measurements and prediction validation. We show that experimental measurements provide strong support for the performance prediction on multiprocessors with implicit communications and complex memory systems.< >

关键词： Predictive models Computational modeling Laboratories Sun High performance computing Software performance Software measurement Application software Analytical models Performance analysis

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Verifying the determinant in parallel 5th

Verifying the determinant in parallel

引用

5th Annual international symposium on Algorithms and Computation, ISAAC 1994

作者： Santha, Miklos Tan, Sovanna CNRS URA 410 Université Paris-Sud Orsay91405 France Ecole Nationale Supérieure de Techniques Avancées 32 bd Victor Paris75015 France

ISBN: (纸本)9783540583257

In this paper we investigate both in the Boolean arithmetic circuit and the Boolean circuit model the complexity of the verification of problems whose computation is equivalent to the determinant. We observe that for a few problems there exist an easy (NC1) verification algorithm. To characterize the harder ones, we define under two different reductions the class of problems which are reducible to the verification of the determinant and establish a list of complete problems in these classes. In particular we prove that computing the rank is equivalent under AC0 reduction to verifying the determinant. We show in the Boolean case that none of the complete problems can be recognized in NC1 unless L = NL. On the other hand we show that even for problems which are hard to verify there exists an NC1 checker and that they can be extended into problems whose verification is easy. © 1994, Springer Verlag. All rights reserved.

关键词： Computers

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A hybrid approach for mutual exclusion in distributed computing systems

A hybrid approach for mutual exclusion in distributed comput...

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international symposium on parallel and distributed Processing (IPDPS)

作者： S. Madhuram A. Kumar Engineering Mathematics and Computer Science University of Louisville Louisville KY USA

We propose a hybrid algorithm to achieve mutual exclusion in distributed systems. In our algorithm we propose a logical grouping of the sites into a hierarchical structure. We have used different algorithms to achieve mutual exclusion at each level of the hierarchy. the hierarchical structure is not rigid and can be modified to achieve different performance criteria. We demonstrate the adaptable nature of this approach which leads to better overall performance. the hybrid algorithm needs only a maximum of 2/spl radic/N+1 messages where N is the number of sites in the distributed system. this can be further reduced to just 5 messages per CS invocation at high loads by making small modifications to the original hybrid algorithm. the best features of this algorithm are its deadlock-free nature and its low message traffic at high loads.< >

关键词： distributed computing System recovery Synchronization Delay effects Communication system control distributed algorithms Mathematics Computer science Telecommunication traffic Measurement

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distributed image edge detection methods and performance

Distributed image edge detection methods and performance

引用

international symposium on parallel and distributed Processing (IPDPS)

作者： Xiaodong Zhang Hong Deng High-Performance Computing and Software Laboratory University of Texas San Antonio San Antonio TX USA

ISBN: (纸本)0818664274

An edge detection process in computer vision and image processing detects any types of significant features appearing as discontinuities in intensities. this paper presents our experience with parallelizing an edge detection application algorithm that reduces noise and unnecessary detail in a gray-scale image from a coarse level to a fine level of resolution by using an edge focusing technique. Numerical methods and parallel implementations of edge focusing are presented. the image detection algorithms are implemented on three representative message-passing architectures: a low-cost heterogeneous PVM network, an Intel iPSC/860 hypercube, and a CM-5 massively parallel multicomputer. Our objectives are to provide insight into implementation and performance issues for image processing applications on general-purpose message-passing architectures, to investigate implications an network variations, and to evaluate the computing scalabilities on the three network systems by examining execution and communication patterns of the image edge detection application.< >

关键词： Image edge detection Image processing Focusing Computer architecture Computer vision Application software Noise reduction Noise level Gray-scale Image resolution

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Communication and computation patterns of large scale image convolutions on parallel architectures

Communication and computation patterns of large scale image ...

引用

international symposium on parallel Processing

作者： S.G. Dykes Xiaodong Zhang Yan Zhou Haixu Yang High Performance Computing and Software Laboratory University of Texas San Antonio San Antonio TX USA

Segmentation and other image processing operations rely on convolution calculations with heavy computational and memory access demands. the article presents an analysis of a texture segmentation application containing a 96/spl times/96 convolution. Sequential execution required several hours an single processor systems with over 99% of the time spent performing the large convolution. 70% to 75% of execution time is attributable to cache misses within the convolution. We implemented the same application on CM-5, iPSC/860 and PVM distributed memory multicomputers, tailoring the parallel algorithms to each machine's architecture. parallelization significantly reduced execution time, taking 49 seconds on a 512 node CM-5 and 6.5 minutes on a 32 node iPSC/860. the results indicate for large kernel convolutions the size and bandwidth of the fast memory store is more important than processor power or communication overhead.< >

关键词： Concurrent computing Large-scale systems parallel architectures Image segmentation Image processing Kernel Laboratories Bandwidth Pixel Smoothing methods

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Deterministic permutation routing on a reconfigurable mesh

Deterministic permutation routing on a reconfigurable mesh

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international symposium on parallel Processing

作者： A. Kapoor H. Schroder B. Beresford-Smith Department of E & C Engg. University of Newcastle Callaghan NSW Australia Department of CS University of Newcastle Callaghan NSW Australia

Presents an algorithm for Permutation Routing on a reconfigurable mesh based on the divide and conquer paradigm. the algorithm has a worst case running time of 4n+O(log2/sup /n) communication steps and requires a maximum queue size of 5. the O(log/sup 2/ n) term is associated with communication of single words which convey information about the distribution of packets. Hence, if the packet length is much larger than a single word, then the constant associated with this term is negligible.< >

关键词： Routing Australia parallel machines Delay distributed computing

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Simulation study of the capacity bounds in cellular systems

Simulation study of the capacity bounds in cellular systems

引用

IEEE international symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Z.J. Haas J.H. Winters D.S. Johnson AT and T Bell Laboratories Inc. Holmdel NJ USA AT and T Bell Laboratories Inc. Murray Hill NJ USA

We investigate the capacity of cellular systems. In particular, we study how the reuse factor can be improved given the knowledge of the mobiles' locations; i.e., we evaluate the minimum number of channels required to support a cellular infrastructure with a given number of mobiles in each cell. We assume that the mobiles' locations are sampled from the uniform random distribution or are fixed on a uniform grid. Moreover, we show the effect of a number of parameters, such as the number of mobiles per cell, the minimum allowable signal-to-interference ratio, and limited knowledge of mobile location. the assumption of a single interferer, used in our study, is also justified.

关键词： Interference Channel allocation Mobile computing Lifting equipment Usability distributed computing

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Research challenges in wireless multimedia

Research challenges in wireless multimedia

引用

IEEE international symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： R. Brodersen T. Burd F. Burghardt A. Burstein A. Chandrakasan R. Doering S. Narayanaswamy T. Pering B. Richards T. Truman J. Rabaey Department of EECS University of California Berkeley USA

the near future will bring the fusion of four rapidly evolving technologies: high speed networking and associated services, wireless communications, scaled integrated circuit technology, and multimedia-based applications. these new technologies will enable the access of multimedia data from network servers at any time and any place by light weight, low cost wireless terminals.

关键词： Video on demand Video compression Network servers Spine Databases Graphics distributed computing Portable computers Integrated circuit technology Costs

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Pin-efficient networks for cubic neighborhoods

Pin-efficient networks for cubic neighborhoods

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international symposium on parallel and distributed Processing (IPDPS)

作者： C.M. Fiduccia K.J. Rappoport Supercomputing Research Center Bowie MD USA Pacific-Sierra Research Arlington VA USA

Pin-efficient bussed network families are discussed that can-in one clock tick-simultaneously shift all data in a k-dimensional grid to neighboring processors in any one of the 3/sup k/-1 'compass directions' x/spl ***//spl rarr/x/spl ***/+/spl delta//spl ***/, for every nonzero vector /spl delta//spl ***/ /spl isin/ {-1,0,1}/sup k/. the networks have the advantages of being simple to describe (using a single 5-state automaton), extendible (the k-dimensional network is obtained by extending the busses of the (k-1)-dimensional network), and provably optimal for k/spl les/3. the networks use only [3/2(/spl radic/3)/sup k/] pins per processor, which is within 3/2 of the theoretical minimum number of pins required. the best previously known family uses 2/sup k/ pins.< >

关键词： Pins Clocks Hardware Costs Genetic mutations Computer networks Grid computing Physics computing Marine vehicles Automata

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Mathematical models for the analysis of dynamic channel selection for indoor mobile wireless communication systems

Mathematical models for the analysis of dynamic channel sele...

引用

IEEE international symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： J.B. Punt D. Sparreboom F. Brouwer Delft University of Technnology Netherlands Ericsson Business Mobile Networks BV Singapore

Dynamic channel selection (DCS) is an algorithm for flexible mobile cellular radio resource sharing. It has been implemented in the Digital European Cordless Telecommunications (DECT) standard. Models are developed to calculate probabilities of channel availability, desired carrier power and the carrier to interference ratio for a constant traffic load. these results can be used to compute the call set-up blocking probability. the models of this study are based on a decentralized DCS according to the DECT standard specifications. the channel availability model shows that resource blocking is sensitive to the implementation of the portable sets; also that this type of DCS can be as good as fixed channel allocation with respect to resource blocking.

关键词： Mathematical model distributed control Availability Land mobile radio cellular systems Resource management Telecommunication standards Probability Interference Telecommunication traffic Telecommunication computing

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