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检索条件"任意字段=16th Symposium on Computer Architecture and High Performance Computing"

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performance evaluation of a seismic data analysis kernel on the KSR multiprocessors

Performance evaluation of a seismic data analysis kernel on ...

引用

International symposium on Parallel Processing

作者： W. Gu College of Computing Georgia Institute of Technology Atlanta GA USA

the paper presents the results of performance analyses of a seismic analysis kernel code on the KSR multiprocessors. the purpose of such analysis is to understand the performance behaviors of a class of applications on shared memory parallel machines. the g5 kernel code, commonly used in seismic analysis applications, is parallelized, and its computational and I/O performance is analyzed on a 32-node KSR-1 and a 64-node KSR-2.< >

关键词： Data analysis Kernel Memory architecture Petroleum Costs Data processing Writing computer interfaces high performance computing Artificial intelligence

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Distributed pinwheel scheduling with end-to-end timing constraints

Distributed pinwheel scheduling with end-to-end timing const...

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Real-Time Systems symposium (RTSS)

作者： Chih-Wen Hsueh Kwei-Jay Lin Nong Fan Department of Electrical and Computer Engineering University of California Irvine CA USA

ISBN: (纸本)0818673370

Algorithms for allocating resources and scheduling tasks are important to the success of many real-time systems with end-to-end performance requirements. In this paper, an end-to-end scheduling model based on the pinwheel scheduling algorithms is presented for distributed real-time systems. We discuss how tasks on different nodes may be transformed to have harmonic periods. We also present algorithms to adjust the phases between schedules on neighboring nodes so that the overall end-to-end delay is reduced. Using the pinwheel approach, schedules on different nodes are closely synchronized and more static. However, for many real-time systems, this practical approach may provide a more predictable performance and a shorter end-to-end delay.

关键词： Timing Scheduling algorithm Real time systems Processor scheduling Delay Resource management Military computing Aerospace control Sensor systems Actuators

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Communication overhead for space science applications on the Beowulf parallel workstation 95

Communication overhead for space science applications on the...

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International symposium on high performance Distributed computing

作者： T. Sterling D. Savarese D.J. Becker B. Fryxell K. Olson Center of Excellence in Space Dataand Information Sciences NASA Goddard Space Flight Center Greenbelt MD USA Department of Computer Science University of Maryland College Park MD USA Institute for Computational Scienceand Informatics George Mason University USA

ISBN: (纸本)9780818670886

the Beowulf parallel workstation combines 16 PC-compatible processing subsystems and disk drives using dual Ethernet networks to provide a single-user environment with 1 Gops peak performance, half a Gbyte of disk storage, and up to 8 times the disk I/O bandwidth of conventional workstations. the Beowulf architecture establishes a new operating point in price-performance for single-user environments requiring high disk capacity and bandwidth. the Beowulf research project is investigating the feasibility of exploiting mass market commodity computing elements in support of Earth and space science requirements for large data-set browsing and visualization, simulation of natural physical processes, and assimilation of remote sensing data. this paper reports the findings from a series of experiments for characterizing the Beowulf dual channel communication over-head. It is shown that dual networks can sustain 70% greater throughput than a single network alone but that bandwidth achieved is more highly sensitive to message size than to the number of messages at peak demand. While overhead is shown to be high for global synchronization, its overall impact on scalability of real world applications for computational fluid dynamics and N-body gravitational simulation is shown to be modest.

关键词： Bandwidth Workstations Computational modeling Disk drives Ethernet networks computer architecture Physics computing Geoscience Data visualization Remote sensing

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Worst case timing analysis of RISC processors: R3000/R3010 case study

Worst case timing analysis of RISC processors: R3000/R3010 c...

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Real-Time Systems symposium (RTSS)

作者： Yerang Hur Young Hyun Bae Sung-Soo Lim Sung-Kwan Kim Byung-Do Rhee Sang Lyul Min Chang Yun Park Minsuk Lee Heonshik Shin Chong Sang Kim Department of Computer Engineering Seoul National University Seoul South Korea Department of Computer Engineering Chung-Ang University Seoul South Korea Department of Computer Engineering Hansung University Seoul South Korea

ISBN: (纸本)0818673370

this paper presents a case study of worst case timing analysis for a RISC processor. the target machine consists of the R3000 CPU and R3010 FPA (Floating Point Accelerator). this target machine is typical of a RISC system with pipelined execution units and cache memories. Our methodology is an extension of the existing timing schema. the extended timing schema provides means to reason about the execution time variation of a program construct by surrounding program constructs due to pipelined execution and cache memories of RISC processors. the main focus of this paper is on explaining the necessary steps for performing timing analysis of a given target machine within the extended timing schema framework. this paper also gives results from experiments using a timing tool for the target machine that is built based on the extended timing schema approach.

关键词： computer aided software engineering Timing Reduced instruction set computing Cache memory performance analysis Real time systems Scheduling algorithm Processor scheduling Pipelines

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MithOS-a real-time micro-kernel threads operating system

MiThOS-a real-time micro-kernel threads operating system

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Real-Time Systems symposium (RTSS)

作者： F. Mueller V. Rustagi T.P. Baker Institut für Informatik Humboldt-Universität zu Berlin Berlin Germany Microtec Research Inc. Santa Clara CA USA Department of Computer Science Florida State University Tallahassee FL USA

MithOS (Micro-kernel threads Operating System) is an experimental operating system for embedded systems. the system kernel is a first implementation of the POSIX Minimal Real-Time System Profile. It is based on prior work of a library implementation of Pthreads (POSIX threads). the system is fully preemptive. It supports multi-threading within a single process environment with shared kernel and user space, i.e. real-time tasks are mapped onto POSIX threads. It exhibits remarkable timing predictability intended for hard real-time requirements. this is achieved by a careful design of only few device drivers. the system has been implemented and tested on the SPARC VME architecture. the system includes a fast context switching algorithm for the SPARC which outperforms the context switch under SunOS and matches the performance under Solaris. It supports selective enabling and disabling of hardware components (MMU, caches, etc.) since its sources are available. Furthermore, an implementation-defined extension of POSIX threads for deadline scheduling is presented. Overall, the system exhibits slightly faster performance than SunOS 4.x and is considerably more predictable in its timing behavior. Applications of the kernel range from evaluating the overhead of new language features in Ada 95 and its runtime system, verifying static timing predictions on a bare machine, to providing the operating system for small embedded system that require a high timing predictability.

关键词： Real time systems Yarn Operating systems Timing Kernel Embedded system Switches Libraries System testing Hardware

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Parallel algorithms for database operations and a database operation for parallel algorithms

Parallel algorithms for database operations and a database o...

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International symposium on Parallel Processing

作者： R. Raman U. Vishkin Department of Computer Science King''s College London UK Electrical Engineering Department University of Maryland Institute for Advanced Computer Studies UMIACS College Park MD USA

this paper establishes some significant links between two areas: (i) relational parallel database systems; and (ii) the design and analysis of parallel algorithms. the paper begins with a fundamental but very simple observation: implementing a JOIN operation in the context of relational parallel database systems is at least as expensive as implementing an arbitrary PRAM computation. thus, the efficiency with which a given parallel computer can support a parallel relational database where JOINs are fairly frequent is strongly related to the efficiency with which that computer can support the PRAM as one of its programmer's models. the main technical contribution is an efficient parallel algorithm for the JOIN operation on a model where, in order to use the available bandwidth effectively, communication has to be performed in large blocks.< >

关键词： Parallel algorithms Concurrent computing Relational databases Database systems Phase change random access memory Parallel processing high performance computing Bandwidth computer architecture computer industry

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Passive cyclotron current drive for fusion plasmas

Passive cyclotron current drive for fusion plasmas

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IEEE/NPSS symposium on Fusion Engineering

作者： W. Kernbichler Institut für Theoretische Physik Technische Universität Graz Graz Austria

the creation of toroidal current using cyclotron radiation in a "passive" way is, together with the well known bootstrap current, an interesting method for stationary current drive in high-temperature fusion reactors. Here, instead of externally applied RF-waves, fish-scale like structures at the first wall help to create enough asymmetry in the self generated cyclotron radiation intensity to drive a current within the plasma. the problem of computing passive cyclotron current drive consists of actually two linked problems, which are the computation of the electron equilibrium under the presence of self-generated radiation, and the computation of the photon equilibrium in a bounded system with a distorted electron distribution. this system of integro-differential equations cannot be solved directly in an efficient way. therefore a linearization procedure was developed to decouple both sets of equations, finally linked through a generalized local current drive efficiency. the improved formulas for this efficiency take into account the differential and integral part of the relativistic Coulomb collision operator as well as the linearized electromagnetic collision term. the resulting linear equation is solved with the help of Green functions using the expansion over the angular eigenfunctions. the problem of the exact accounting for the wall profile effects was reduced to the solution of a Fredholm-type integral equation of the 2/sup nd/-kind. Based on all this an extensive computer code was developed to compute the passively driven current as well as radiation losses, radiation transport and overall efficiencies. the results there from give an interesting and very detailed insight into the problems related to passive cyclotron current drive.

关键词： Cyclotrons Plasmas Distributed computing Optical computing Integral equations Electrons Fusion reactors Fusion power generation Drives Integrodifferential equations

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Parallel processing algorithms and architecture for multimedia on-demand servers

Parallel processing algorithms and architecture for multimed...

引用

International symposium on Parallel Processing

作者： R. Neogi M. Wagh Motorola Inc. Austin TX USA Lehigh University Bethlehem PA USA

Advances in networking and storage technologies have made it possible to build multimedia on-demand servers that provide service similar to those of neighborhood videotape rental stores. We propose a specialized high performance programmable multiprocessor architecture which allows continuous playback of mediastreams to large number of clients, a critical factor in multimedia servers. this architecture supports dynamic phase shifts in media distribution which is particularly useful in a distributed environment. We introduce algorithms for maximum concurrency extraction and to avoid task migration in the presence of dynamically changing demand. We show that our solution performs an order of magnitude better than other known solutions.< >

关键词： Parallel processing Network servers Streaming media Multimedia systems Auditory displays Buffer overflow Image storage Concurrent computing computer networks Wide area networks

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Distributed computing testbed for a remote experimental environment

Distributed computing testbed for a remote experimental envi...

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IEEE/NPSS symposium on Fusion Engineering

作者： D.N. Butner T.A. Casper B.C. Howard P.A. Henline S.L. Davis D. Barnes D.E. Greenwood Lawrence Livemore National Laboratory Livermore CA USA General Atomics Inc. San Diego CA USA Princeton Plasma Physics Laboratory Princeton NJ USA Lockheed Martin Energy Systems Oak Ridge TN USA

Collaboration is increasing in importance as physics research continues to become concentrated on a few large and expensive facilities. this is particularly true in magnetic fusion energy research, where the next generation experiments will be operated as facilities with national and international participation. In addition, these facilities are designed for steady state operation, for which interactive, real-time experimentation becomes an important issue. We are developing tools to provide for the establishment of geographically distant centers for interactive operations; such centers would allow scientists to participate in experiments from their home institutions. We are developing a testbed for a Remote Experimental Environment (REE), a "Collaboratory" the testbed will be used to evaluate the ability of a remotely located group of scientists to conduct research on the DIII-D Tokamak at General Atomics (GA). the REE will serve as a testing environment for advanced control and collaboration concepts applicable to future experiments. Process-to-process communications over high speed wide area networks provide real-time synchronization and exchange of data among multiple computer networks, while the ability to conduct research is enhanced by adding audio/video communication capabilities. the Open Software Foundation's (OSF) Distributed computing Environment (DCE) is being used to test concepts in distributed control, security, naming, remote procedure calls and distributed file access using the Distributed File Services (DFS). We are exploring the technology and sociology of remotely participating in the operation of a large scale experimental facility.

关键词： Distributed computing Collaboration Physics Steady-state Tokamaks Communication system control Wide area networks computer networks Software testing Distributed control

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Simple aerosol modelling for fusion power plant containments

Simple aerosol modelling for fusion power plant containments

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IEEE/NPSS symposium on Fusion Engineering

作者： W.E. Han Government Division UKAEA Abingdon UK

the modelling of the transport and depletion of aerosols in fusion power plant containment volumes is an important part of the analysis of postulated accidents. this has hitherto been performed either by very over-simplified and over-conservative calculations or by the use of large codes which are time-consuming and inflexible to use, and do not readily lead to understanding. these large codes make quite heavy demands on computer resources because they have to calculate agglomeration and removal rates, as well as number densities of aerosol particles with a distribution of sizes. this paper describes a method of taking these particle growth and mass depletion effects into account by transforming the problem into one of calculating the behaviour of a monodisperse aerosol of constant size which is defined by the geometry of the containment system and the total mass of aerosol present initially. Results were obtained for a number of test cases and compared with calculations for the same cases carried out using IthACA. the agreement between the two methods was found to be excellent. Further calculations for a more comprehensive range of conditions were also carried out with the proposed model and the results presented. these extended calculations illustrate the fact that even significantly damaged containments (signified by a high leak rate) can, depending on the conditions, bring about retention of nearly all the aerosol by gravitational settling.

关键词： Aerosols Power generation Accidents Government Geometry Testing computer industry Safety Surface treatment performance evaluation

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