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检索条件"任意字段=5th Distributed Memory Computing Conference, DMCC 1990"

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Concurrent supercomputing in Europe 5

Concurrent supercomputing in Europe

引用

5th distributed memory computing conference, dmcc 1990

作者： Hey, Anthony J.G. IBM T.J.Watson Research Laboratory Yorktown HeightsNY10598 United States Electronics and Computer Science Department Southampton University S09 5NH United Kingdom

ISBN: (纸本)0818621133

this paper reviews present developments in concurrent 'supercomputers' taking place in Europe. After some preliminary discussion of the terms of reference, the Edinburgh Concurrent Supercomputer project is described in some detail. this is probably the most serious attempt within Europe to use a highly parallel machine as the basis for a real user service. the hardware is based on Meiko's Computer Surface and the system contains over 400 Inmos T800 transputers. the only commercial non-transputer parallel system produced in Europe is the Suprenum machine. the architecture of this machine is a hierarchical bus-based distributed-memory MIMD system with clusters of vector processing nodes. their first customer shipment took place at the end of 1989 and some early results on simple performance benchmarks are presented. Two recently-funded special-purpose parallel machines for QCD are then described. the first is the APE-100, a custom-VLSI successor to the original Italian APE project. the second is the QCD-20 project in the UK which combines the processing and communicating capabilities of the Intel i860 and the Inmos T800 transputer. the Inmos T800 transputer was a result of the Esprit Supernode project which also produced a reconfigurable transputer architecture now manufactured by Parsys in the UK and Telmat in Trance. In the Espril-2 research programme, the Genesis and PUMA projects are directed at highly parallel architectures for numerical computing. the results of the Genesis Evaluation group and the Genesis Parallel Benchmark suite of Fortran programmes are summarized along with brief details of the Genesis and Puma projects. Inmos are participating in the Puma project which will deliver their next generation parallel-processing components. Some comments on the possibility of constructing genuinely general-purpose parallel computers with scalable performance are included as a conclusion. © 1990 IEEE.

关键词： Transputers

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Parallel solutions to the phase problem in X-ray crystallography 5

Parallel solutions to the phase problem in X-ray crystallogr...

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5th distributed memory computing conference, dmcc 1990

作者： Bashir, N. Hauptman, H. Miller, R. Crovella, M. Horvath, J. Sabin, T. De Titta, G. King, H. thuman, P. Han, F. Langs, D. Velmurugan, D. Department of Computer Science University at Buffalo BuffaloNY14260 United States Department of Computer Science University at Buffalo United States Medical Foundation of Buffalo 73 High Street BuffaloMY14203 United States Department of Chemistry University at Buffalo BuffaloNY14214 United States Upjohn Company KalamazooMI49001 United States School of Medicine and Biophysical Sciences University at Buffalo BuffaloNY14214 United States Department of Computer Science University of Rochester RochesterNY14627 United States Department of Computer Science University of Wisconsin MadisonWI53706 United States Graduate Group in Advanced Scientific Computing University at Buffalo 226 Bell Hall BuffaloNY14260 United States

ISBN: (纸本)0818621133

the central problem of single crystal molecular structure determination via X-ray diffraction is the "phase problem." Associated with each diffraction maximum (a reflection) are a magnitude, which can be experimentally determined, and a phase angle, which is lost in the experiment. the goal of "direct methods" is to mathematically reconstruct the phase information from the magnitude information alone. Traditional direct methods are capable of determining structures of moderate complexity, but to extend them to problems of the size of macromolecules (proteins, etc.) requires developing new techniques that appear to be computationally intensive. Recently, a new formulation of the phasing process, dependent on a minimal function, has been proposed. Here we explore a number of different implementations of the principle to the solution of small molecular structures. the machines that we use include an Intel iPSC/2 hypercube, the Connection Machine CM- 2, and a network of Sun workstations. © 1990 IEEE.

关键词： Molecular structure

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External Sorting on a distributed memory machine 6

External Sorting on a distributed memory machine

引用

6th distributed memory computing conference, dmcc 1991

作者： Ecklund, Denise J. Supercomputer Systems Division Intel Corporation United States

ISBN: (纸本)0818622903

Sorting is a classic problem [5], which naturally lends itself to parallel processing. Many researchers have investigated memory-based parallel sorting [3], but only a few researchers have investigated the problem of parallel external sorting [2, 4]. Existing algorithms employ local sorting of runs followed by pipelined merging of runs. the writing of the final merged result is a serial process performed by a single processor. this sequential bottleneck has a significant negative impact on the total sort time. It also does not make effective use of the concurrent I/O capabilities provided on a number of parallel machines. I have proposed and prototyped a two phase parallel external sorting algorithm that removes the "final merge bottleneck" by partitioning sorted runs and utilizing multiple processors to build a merged run. © 1991 IEEE.

关键词： Mergers and acquisitions

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distributed algorithm for nuclear structure investigations 6

Distributed algorithm for nuclear structure investigations

引用

6th distributed memory computing conference, dmcc 1991

作者： Huntsberger, Terry Department of Computer Science University of South Carolina ColumbiaSC29208 United States

ISBN: (纸本)0818622903

Since the form of the nuclear force is not explicitly known, various models have been proposed to account for the nucleon-nucleon scattering data and gross properties of nuclei, such as quadrupole moments, binding energy, etc. Some of the better known models are the liquid-drop [7], shell [4], unified [5] and group-theoretical [6] approximations. this paper presents a hypercube based algorithm for the derivation of nuclear structure energy levels and binding energies for a wide range of isotopes. the algorithm is based on previous work [1, 2] which studied isotopes in the f-p-g shell shown in Figure 1. Extensions to higher order shells are obtained using a distributed decomposition of the coupled state and perturbation calculations. the results of scaling experiments for the NCUBE/10 system at the University of South Carolina are also included. © 1991 IEEE.

关键词： Binding energy

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Optimal total exchange on an SIMD distributed-memory hypercube 6

Optimal total exchange on an SIMD distributed-memory hypercu...

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6th distributed memory computing conference, dmcc 1991

作者： Delesalle, D. Trystram, D. Wenzek, D. LMC-IMAG 46 avenue Felix Viallet Grenoble Cedex38031 France

this paper deals with optimality results on the implementation of fundamental communication schemes on a distributed-memory SIMD hypercube-multiprocessor (namely, global exchange and personalized global exchange with ... 详细信息

ISBN: (纸本)0818622903

关键词： memory architecture

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distributed particle based fluid flow simulation 6

Distributed particle based fluid flow simulation

引用

6th distributed memory computing conference, dmcc 1991

作者： Gilman, T.L. Huntsberger, T.L. Sharma, P. Savannah River Laboratory AikenSC United States Department of Computer Science University of South Carolina ColumbiaSC29208 United States

ISBN: (纸本)0818622903

Many attempts have been made to simulate the motion of non-rigid objects. While there have been many successes in this area, the animation of fluids is still a relatively unconquered frontier. this paper describes a distributed model for fluid flow study based on behavioral simulation of atom-like particles. these particles define the size and shape of the fluid. In addition, these particles have inertia and respond to attraction, repulsion and gravitation. Unlike previous fluid flow systems, inter-particle forces are explicitly included in the model. A distributed mapping of the particle database similar to recent load-balanced PIC studies [5, 6] allows large numbers of particles to be included in the model. We also present the results of some experimental studies performed on the NCUBE/10 system at the University of South Carolina. © 1991 IEEE.

关键词： Flow of fluids

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Resource management in a large reconfigurable transputer-based system 6

Resource management in a large reconfigurable transputer-bas...

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6th distributed memory computing conference, dmcc 1991

作者： Sreekantaswamy, H. Goldstein, N. Wagner, A. Chanson, S. Department of Computer Science University of British Columbia VancouverBCV6T 1W5 Canada

ISBN: (纸本)0818622903

this paper describes two of the major components of TIPS, a Transputer-based Interactive Parallelizing System, under development at UBC. the system runs on a 74 node transputer system interconnected by crossbar switches with multiple links to the host, a SUN-4-It uses Trollius1 with the Logical Systems C compiler. the first component described is TMAP, a topology independent mapping facility. TMAP's objective is to automate the mapping process, and make it independent from changes in the underlying architecture. It integrates two large pieces of software, Trollius and Prep-p. We describe its design and discuss specific problems in trying to achieve a machine independent environment. the second component described is TRES, a higher level resource management facility. TRES is based on parameterized models of computation which are used to predict performance and optimize the use of machine resources. the user need only specify the model (i.e. programming paradigm) and the computational task to be performed. TRES determines the optimal topology and number of processors to use. this information is used by the TMAP system. © 1991 IEEE.

关键词： Transputers

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Skipping Unused Events to Speed Up Rollback-Recovery in distributed Data-Parallel CEP 5

Skipping Unused Events to Speed Up Rollback-Recovery in Dist...

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11th IEEE/ACM International conference on Utility and Cloud computing (UCC-Companion) / 5th IEEE/ACM International conference on Big Data computing, Applications and Technologies (BDCAT)

作者： Lima, Guilherme F. Endler, Markus Slo, Ahmad Bhowmik, Sukanya Rothermel, Kurt Pontificial Catholic Univ Rio De Janeiro Dept Informat Rio De Janeiro Brazil Univ Stuttgart Inst Parallel & Distributed Syst Stuttgart Germany

ISBN: (纸本)9781538655023

We propose two extensions for a state-of-the-art method of rollback-recovery in distributed CEP (complex event processing). In CEP, an operator network is used to search for patterns in events streams. Sometimes these operators fail and lose their state. Rollback-recovery is a method for dealing with such state losses. the type of rollback-recovery we consider is upstream backup, where the state of a failed operator is recovered by replaying to it the input events that led it to that state. these events are kept in upstream operators' memory buffers, which are trimmed continuously as the downstream operator progresses. the first extension we propose saves memory and speeds up recovery by avoiding to store and retransmit unnecessary events. the second extension makes the base method of upstream backup compatible with data-parallel CEP, allowing that the windows into which operators partition their input be processed in parallel. We evaluated the proposed extensions through experiments that showed a significant reduction in memory usage and recovery time at the expense of a negligible processing overhead during normal operation.

关键词： complex event processing fault-tolerance reliability recovery

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Domain Decomposition and Incomplete factorisation methods for partial differential equations 6

Domain Decomposition and Incomplete factorisation methods fo...

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6th distributed memory computing conference, dmcc 1991

作者： Christara, Christina C. Department of Computer Sciences University of Toronto TorontoM5S 1A4 Canada

ISBN: (纸本)0818622903

In this paper we develop and study a method which tries to combine the merits of Domain Decomposition (DD) and Incomplete Cholesky preconditioned Conjugate Gradient method (ICCG) for the parallel solution of linear elliptic Partial Differential Equations (PDEs) on rectangular domains. We first discretise the PDE problem, using Spline Collocation, a method of Finite Element type based on smooth splines. this gives rise to a sparse linear system of equations. the ICCG method provides us with a very efficient, but not straightforward parallelis-able linear solver for such systems. On the other hand, DD methods are very effective for elliptic PDEs. A combination of DD and ICCG methods, in which the sub-domain solves are carried out with ICCG, leads to efficient and highly parallelisable solvers. We implement this hybrid DD-ICCG method on a hypercube, discuss its parallel efficiency, and show results from experiments on configurations with up to 32 processors. We apply a totally local communication scheme and discuss its performance on the iPSCH hypercube. A similar approach can be used with other PDE discretisation methods. © 1991 IEEE.

关键词： Partial differential equations

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Research on Optimization of Application Model Based on Storm 5

Research on Optimization of Application Model Based on Storm

引用

5th IEEE International conference on Software Engineering and Service Science (ICSESS)

作者： Zhao, Lin Shi, Weifeng NW Univ Xian Dept Informat Sci & Technol Xian 710069 Shanxi Province Peoples R China

ISBN: (纸本)9781479932795

Storm is a distributed realtime computing framework of open source by Twitter, it is becoming a leader since of many advantages in realtime computing. this paper presents optimization program for the storm taking up too much resource in the practical application environment, by using of Cgroups mechanism to limit CPU, memory, IO and other resources of worker process, the new mechanism can balance storm's resources usage and stable of system program well.

关键词： storm distributed realtime computing framework excessive resource consumption optimization program

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