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the RACE network architecture

The RACE network architecture

引用

International symposium on Parallel Processing

作者： B.C. Kuszmaul Mercury Computer Systems Inc. Chelmsford MA USA

the RACE parallel computer system provides a high-performance parallel interconnection network at low cost. this paper describes the architecture and implementation of the RACE system, a parallel computer for embedded applications. the topology of the network, which is constructed with 6-port switches, can be specified by the customer and is typically a fat-tree, a Clos network, or a mesh. the network employs a preemptable circuit switched strategy. the network and the processor-network interface work together to provide high performance: 160 megabytes per second transfer rates with about 1 microsecond of latency. Priorities can be used to guarantee tight real-time constraints of a few microseconds through a congested network. A self-regulating circuit adjusts the impedance and output delay of the pin-driver pads.< >

关键词： computer architecture Concurrent computing Circuits Delay computer networks Multiprocessor interconnection networks Costs computer applications Embedded computing Application software

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Fault-tolerant real-time communication in FDDI-based networks

Fault-tolerant real-time communication in FDDI-based network...

引用

Real-Time Systems symposium (RTSS)

作者： Biao Chen S. Kamat Wei Zhao Department of Computer Science Texas A and M University College Station TX USA

FDDI-Based Reconfigurable Networks have an architecture that is suitable for delivering messages that have hard real-time constraints as well as certain fault-tolerance requirements. this architecture uses multiple FDDI networks to connect hosts and provides for automatic reconfiguration to maintain high network bandwidth in spite of faults. An important open problem is how resources in such networks should be managed in order to guarantee that the fault-tolerant real-time requirements of messages are met. this paper presents an efficient and practical solution to this problem. Our solution consists of off-line and on-line components. On-line management deals with run-time manipulation of messages and network resources. A message grouping approach simplifies on-line management. Off-line management deals with message grouping, bandwidth allocation and schedulability verification. three approaches are investigated: spatial redundancy, temporal redundancy and an integrated approach. It is shown that the integrated approach has the best performance. Our solution is compatible with the FDDI and SAFENET standards.

关键词： Fault tolerance Intelligent networks FDDI Optical fiber communication Resource management Fault tolerant systems Real time systems Oils

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Optimal combined task and message scheduling in distributed real-time systems

Optimal combined task and message scheduling in distributed ...

引用

Real-Time Systems symposium (RTSS)

作者： T.F. Abdelzaher K.G. Shin Real-time Computing Laboratory Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA

In this paper we present a branch-and-bound (B&B) algorithm for combined task and message scheduling in distributed hard real-time systems. the algorithm finds an optimal schedule for a set of communicating tasks with known arrival times, precedence constraints, and resource requirements in conjunction with the assignment and scheduling of intertask messages over communication links. the schedule is "optimal" in the sense of minimizing maximum task lateness under a heuristic message priority assignment found during the search. A robotics application is used to illustrate the utility and potential of the algorithm. Results of an extensive simulation study analyzing its performance are also presented.

关键词： Real time systems Optimal scheduling Processor scheduling Scheduling algorithm Delay Distributed computing Laboratories Time factors Robot sensing systems Analytical models

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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...

引用

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

引用

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

引用

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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