关键词： 多处理器   对称多处理   非对称多处理   共享内存   消息传递   多处理器通信接口层  

摘要： 描述了针对实时嵌入式应用的多处理器操作系统的实现框架，简单介绍了常用的多处理器系统所采用的架构，提出了另外一种多处理器系统的实现架构，并讨论了与之相关的通信、全局资源管理、调度、cache一致性和异构性的问题。

关键词： 计算机   多处理器   多线程   时钟频率   SMP系统   内存数据区   中断控制   超线程技术  

摘要： 不知道大家有没有发现．现在PC上系统平台为了满足一些多任务多线程的并行工作需要．开始吸取一些多处理器的技术进来．CPU方面大家熟悉的支持超线程的P4处理器就是模拟两个处理器进行工作的，近期炒得很热的AMD Opteron也把多处理器的概念再次提出，而前段时间ASUS更是推出了支持双路处理器的875P主板，多处理器的字眼越来越多地出现在各种媒体上，那么多处理器和单处理器相比到底有什么好处呢？本文就给大家一个简单的解释。

关键词： uniform multiprocessors   hard-real-time systems   resource augmentation   earliest deadline first   robustness  

摘要： Each processor in a uniform multiprocessor machine is characterized by a speed or computing capacity, with the interpretation that a job executing on a processor with speed s for t time units completes (s x t) units of execution. The earliest-deadline-first (EDF) scheduling of hard-real-time systems upon uniform multiprocessor machines is considered. It is known that online algorithms tend to perform very poorly in scheduling such hard-real-time systems on multiprocessors;resource-augmentation techniques are presented here that permit online algorithms in general (EDF in particular) to perform better than may be expected given these inherent limitations. It is shown that EDF scheduling upon uniform multiprocessors is robust with respect to both job execution requirements and processor computing capacity.

关键词： 企业计算   安腾2   英特尔   多处理器   服务器   数据中心   架构   行业调查   业务服务   支持  

摘要： 行业调查表明,当前付运的所有服务器中超过85％是基于英特尔架构(IA)之上的。新推出的Madison将使 英特尔进一步充实了其在多处理器、关键业务服务器部署方面的实力,即企业计算数据中心的高端应用领域。

关键词： DSP   并行处理   数字信号处理器   多处理器   主机接口   链路口   多通道缓冲串口  

摘要： TI公司的 TMS32 0 C6 x和 AD公司的 ADSP2 10 6 x是目前业界使用广泛的数字信号处理器 (DSP)。本文详细地介绍了利用 TMS32 0 C6 x的接口 HPI、接口 Mc BSP以及 ADSP2 10 6 x的 L ink接口分别组成并行 DSP处理系统的方法 。

关键词： MIPS   多处理器   PMC-Sierra公司   RM9220   RM9224  

关键词： occupancy   distributed shared memory multiprocessors   communication controller   latency   bandwidth   queuing model   flexible node controller  

摘要： While the desire to use commodity parts in the communication architecture of a DSM multiprocessor offers advantages in cost and design time, the impact on application performance is unclear. We study this performance impact through detailed simulation, analytical modeling, and experiments on a flexible DSM prototype, using a range of parallel applications. We adapt the logP model to characterize the communication architectures of DSM machines. The l (network latency) and o (controller occupancy) parameters are the keys to performance in these machines, with the g (node-to-network bandwidth) parameter becoming important only for the fastest controllers. We show that, of all the logP parameters, controller occupancy has the greatest impact on application performance. Of the two contributions of occupancy to performance degradation-the latency it adds and the contention it induces-it is the contention component that governs performance regardless of network latency, showing a quadratic dependence on o. As expected, techniques to reduce the impact of latency make controller occupancy a greater bottleneck. Surprisingly, the performance impact of occupancy is substantial, even for highly-tuned applications and even in the absence of latency hiding techniques. Scaling the problem size is often used as a technique to overcome limitations in communication latency and bandwidth. Through experiments on a DSM prototype, we show that there are important classes of applications for which the performance lost by using higher occupancy controllers cannot be regained easily, if at all, by scaling the problem size.

关键词： real-time systems   multiprocessor   scheduling   slack sharing  

摘要： The high power consumption of modern processors becomes a major concern because it leads to decreased mission duration (for battery-operated systems), increased heat dissipation, and decreased reliability. While many techniques have been proposed to reduce power consumption for uniprocessor systems, there has been considerably less work on multiprocessor systems. In this paper, based on the concept of slack sharing among processors, we propose two novel power-aware scheduling algorithms for task sets with and without precedence constraints executing on multiprocessor systems. These scheduling techniques reclaim the time unused by a task to reduce the execution speed of future tasks and, thus, reduce the total energy consumption of the system. We also study the effect of discrete voltage/speed levels on the energy savings for multiprocessor systems and propose a new scheme of slack reservation to incorporate voltage/speed adjustment overhead in the scheduling algorithms. Simulation and trace-based results indicate that our algorithms achieve substantial energy savings on systems with variable voltage processors. Moreover, processors with a few discrete voltage/speed levels obtain nearly the same energy savings as processors with continuous voltage/speed, and the effect of voltage/speed adjustment overhead on the energy savings is relatively small.

关键词： SMS   多处理器   终结器   Server   Connection帐号   帐号管理   故障检修  

关键词： 数字信号处理器   数字信号处理   多处理器   超大规模集成电路  

摘要： 近年来,数字信号处理器的设计研究日益成为IC设计方面的热点之一.主要的研究工作集中在两方面:一是通用数字信号处理器的研究;另一个是专用可编程信号处理器的研究.前者灵活性强、开发周期短,但性能较差.后者灵活性较差且开发周期较长,但对特定算法有很好的性能.该文借鉴了SOC设计方法中IP核复用的思想,参考文献[ZPG+00]的提出的结构,介绍了一种基于并行多处理单元的数字信号处理器架构平台.这种结构既具备很好的可扩展性又能充分利用数字信号处理算法中的内在并行性,在灵活性、开发周期与性能等方面取得了更好的平衡.该文以该体系架构为基础,开展了一些设计与研究工作.