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BoomerAMG:: A parallel algebraic multigrid solver and preconditioner

<i>BoomerAMG</i>:: A parallel algebraic multigrid solver and...

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16th IMACS World Congress

作者： Henson, VE Yang, UM Lawrence Livermore Natl Lab Ctr Appl Sci Comp Livermore CA 94551 USA

Driven by the need to solve linear systems arising from problems posed on extremely large, unstructured grids, there has been a recent resurgence of interest in algebraic multigrid (AMG). AMG is attractive in that it holds out the possibility of multigrid-like performance on unstructured grids. The sheer size of many modem physics and simulation problems has led to the development of massively parallel computers, and has sparked much research into developing algorithms for them. Parallelizing AMG is a difficult task, however. While much of the AMG method parallelizes readily, the process of coarse-grid selection, in particular, is fundamentally, sequential in nature. We have previously introduced a parallel algorithm [A.J. Cleary, R.D. Falgout, V.E. Henson, J.E. Jones, in: Proceedings of the Fifth International symposium on Solving Irregularly Structured Problems in Parallel, Springer, New York, 1998] for the selection of coarse-grid points, based on modifications of certain parallel independent set algorithms and the application of heuristics designed to insure the quality of the coarse grids, and shown results from a prototype serial version of the algorithm. In this paper we describe an implementation of a parallel ANIG code, using the algorithm of A.J. Cleary, R.D. Falgout, V.E. Henson, J.E. Jones [in: Proceedings of the Fifth International symposium on Solving Irregularly Structured Problems in Parallel, Springer, New York, 1998] as well as other approaches to parallelizing the coarse-grid selection. We consider three basic coarsening schemes and certain modifications to the basic schemes, designed to address specific performance issues. We present numerical results for a broad range of problem sizes and descriptions, and draw conclusions regarding the efficacy of the method. Finally, we indicate the current directions of the research. (C) 2002 IMACS. Published by Elsevier Science B.V. All rights reserved.

关键词： algebraic multigrid parallel computing

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Efficient Utilization of Memory Mapped NICs onto Clusters using Pipelined Schedules 02

Efficient Utilization of Memory Mapped NICs onto Clusters us...

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IEEE/acm International symposium on Cluster computing and the Grid (CCGRID)

作者： A. Sotiropoulos G. Tsoukalas N. Koziris Department of Electrical and Computer Engineering Computing Systems Laboratory National and Technical University of Athens Athens Greece

ISBN: (纸本)9780769515823

This paper describes the performance benefits attained using enhanced network interfaces to achieve low latency communication. We make use of DMA communication mode, to send data to other nodes, while the CPU performs useful calculations. Zero-copy communication is achieved through pinned-down physical memory regions, provided by NIC's driver modules. Our testbed concerns the parallel execution of tiled nested loops onto a Linux PC cluster with PCI-SCI NICs (Dolphin D330). Tiles are essentially exchanging data and should also have large Computational grain, so that their parallel execution becomes beneficial. We schedule tiles much more efficiently by exploiting the inherent overlapping between communication and computation phases among successive, atomic tile executions. The applied nonblocking schedule resembles a pipelined data-path where computation phases are overlapped with communication ones, instead of being interleaved with them. Experimental evaluation illustrates that when using enhanced communication features such as DMA transfers, memory-mapped interfaces and zero-copy mechanisms, overall performance is considerably improved compared to using conventional, CPU and kernel bounded, communication primitives.

关键词： Tiles Network interfaces Delay Computer interfaces Computer networks Concurrent computing Linear programming Shape Processor scheduling Testing

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27th International symposium on Mathematical Foundations of Computer Science, MFCS 2002

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27th International symposium on Mathematical Foundations of Computer Science, MFCS 2002

ISBN: (纸本)3540440402

The proceedings contain 53 papers. The special focus in this conference is on Mathematical Foundations of Computer Science. The topics include: Global development via local observational construction steps;towards a concise proof of the four-colour theorem of planar maps;applications of finite automata;an algorithmic challenge;low stretch spanning trees;on radiocoloring hierarchically specified planar graphs;finite domain constraint satisfaction using quantum computation;fast algorithms with algebraic monge properties;packing edges in random regular graphs;a lower bound technique for nondeterministic graph-driven read-once-branching programs and its applications;matroid intersections, polymatroid inequalities, and related problems;accessibility in automata on scattered linear orderings;on infinite terms having a decidable monadic theory;a chomsky-like hierarchy of infinite graphs;competitive analysis of on-line stream merging algorithms;coloring k-colorable semirandom graphs in polynomial expected time via semidefinite programming;on word equations in one variable;a sharp bound on the density of guessed bits;two-way finite state transducers with nested pebbles;optimal non-preemptive semi-online scheduling on two related machines;more on weighted servers or FIFO is better than LRU;on maximizing the throughput of multiprocessor tasks;some results on random unsatisfiable k-sat instances and approximation algorithms applied to random structures;evolutive tandem repeats using hamming distance;subgraph isomorphism, log-bounded fragmentation and graphs of locally bounded treewidth and algorithms for computing small NFAs.

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A linear programming based approach for computing optimal fair splittable routing

A linear programming based approach for computing optimal fa...

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IEEE symposium on Computers and Communications (ISCC)

作者： D. Nace Laboratoire Heudiasyc Universite Technologie Compiegne Compiegne France

We consider the fair flow problem in a multiple source multiple sink network, as applied to telecommunication networks. We present an iterative algorithm for computing fair routing in networks where the available resources are shared among competing flows according to a max-min fair sharing criterion. Our main objective is computing optimal routing paths, with regard to max-min fairness, in stable and known traffic conditions. It is a linear programming based approach which permits a lexicographical maximization of the vector of fair-share attributed to the connections competing for network resources. An optimality proof and some computational results are also presented.

关键词： Linear programming IP networks Telecommunication computing Telecommunication traffic Routing protocols Bandwidth Iterative algorithms Computer networks Spine Wavelength division multiplexing

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computing the noise figure of most circuits by applying symbolic analysis

Computing the noise figure of most circuits by applying symb...

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Midwest symposium on Circuits and Systems (MWSCAS)

作者： C. Sanchez-Lopez E. Tlelo-Cuautle A. Diaz-Sanchez INAOE Mexico

A novel method focused on the symbolic computation of noise figures (NF) for MOS transistor (MOST) analog circuits, is presented. In order to improve the computation time, a pure-nodal-analysis (PNA) method is applied by modeling all the circuit elements using the nullor. To demonstrate the suitability of the proposed method, two illustrative examples are given, where the NF computed using the proposed method, is compared with the simulation results using HSPICE.

关键词： Circuit analysis computing Noise figure Circuit noise Noise measurement 1f noise Signal to noise ratio Circuit simulation Voltage Presence network agents Degradation

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Mobility: a VPN perspective [mobile computing]

Mobility: a VPN perspective [mobile computing]

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Midwest symposium on Circuits and Systems (MWSCAS)

作者： R. Bhagavathula N. Thanthry Wanyen Lee R. Pendse 317WH 1845 N Fairmount Wichita State University Wichita KS USA

Mobile computing is becoming increasingly important due to the rise in the number of portable computers and the desire to have continuous network connectivity to the Internet irrespective of the physical location of the node. Mobile IP, the more popular global mobility solution, was designed to support mobility of a single host. Even though the same protocol can be applied in the case of network mobility, providing connectivity to mobile networks introduces many issues related to the scalability, security and QoS. Instead, a mobile network can be cited as a remote site, trying to establish secured communication with the home network. This view of mobile network solves many issues related to QoS, security and scalability. The objective of this paper is to explore the possibility of using different VPN techniques to provide connectivity for mobile networks and measure the corresponding end-to-end performance of real time traffic and best effort traffic patterns.

关键词： Virtual private networks Mobile computing Portable computers Scalability Telecommunication traffic Computer networks Physics computing IP networks Protocols Mobile communication

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Comparative performance of frontal(direct) and pcg(iterative) solver based parallel computations of finite element analysis

Comparative performance of frontal(direct) and pcg(iterative...

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International symposium on Parallel and Distributed Processing (IPDPS)

作者： C.V. Ramakrishnan S.R. Kumar Department of Applied Mechanics Indian Institute of Technology New Delhi India

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Parallel asynchronous Richardson method for the solution of obstacle problem

Parallel asynchronous Richardson method for the solution of ...

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IEEE International symposium on High Performance computing Systems and Applications (HPCS)

作者： P. Spiteri M. Chau ENSEEIHT-IRIT-LIMA Toulouse France

The present study deals with parallel asynchronous iterations applied to the numerical solution of the obstacle problem defined in a three-dimensional domain. For the considered problem, the convergence analysis of the algorithm is made. Finally, the implementation of the algorithms are presented and computational experiments on IBM-SP3 are analysed.

关键词： Iterative algorithms Gold Algorithm design and analysis Constraint optimization Convergence Boundary conditions Cost function Relaxation methods Large-scale systems Concurrent computing

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Treating a user-defined parallel library as a domain-specific language

Treating a user-defined parallel library as a domain-specifi...

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International symposium on Parallel and Distributed Processing (IPDPS)

作者： D.J. Quinlan B. Miller B. Philip M. Schordan Center for Applied Scientific Computing Lawrence Livemore National Laboratory Livermore CA USA

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An advanced filtering TLB for low power consumption

An advanced filtering TLB for low power consumption

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International symposium on Computer Architecture and High Performance computing (SBAC-PAD)

作者： Jin-Hyuck Choi Jung-Hoon Lee Gi-Ho Park Shin-Dug Kim CS Yonsei University Seoul South Korea SOC center Suwon South Korea

This research is to design a new two-level TLB (translation look-aside buffer) architecture that integrates a 2-way banked filter TLB with a 2-way banked main TLB. One of the main objectives is to reduce power consumption in embedded processors by distributing the accesses to the TLB entries across several banks in a balanced manner. Thus, an advanced filtering technique is devised to reduce power dissipation by adopting a sub-bank structure at the filter TLB. And also a bank-associative structure is applied to each level of the TLB hierarchy. Simulation result shows that the miss ratio and Energy*Delay product can be improved by 59.26% and 24.9%, respectively, compared with a micro TLB with 4-32 entries, and 40.81% and 12.18%, compared with a micro TLB with 16-32 entries.

关键词： Filtering Energy consumption Random access memory Filter bank Clocks Capacitance Cities and towns Power dissipation Circuits Reduced instruction set computing

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