关键词： 多处理器手机   数据传输速率   多媒体   WCDMA   Agere  

关键词： 调度   多处理器任务   前提约束   启发算法  

摘要： 研究三个并行处理器环境中,具有递减链约束的多处理器任务的调度问题,调度目标是最小化总处理时间,假设单项任务需单位处理时间.首先给出了减链调度问题的最优化性质与条件,并说明了减链调度问题仍然是NP难的.随后基于两段flow-shop问题的Johnson's算法的修正和减链调度问题最优化性质,提出了一个启发式算法,并从分析和仿真计算两方面说明该算法是有效的和高效的.

关键词： 多处理器系统   Cache   P6总线   一致性   设计  

摘要： 本文介绍了基于P6总线的多处理器系统的总线事务和存储区的Cache属性,讨论了P6总线的硬件监听机制,Pentium Ⅲ处理器所采用的MESI状态转换,最后研究了多处理器和P6总线如何相互配合以保证整个系统的Cache一致性。

关键词： 一致性协议   多处理器系统   高速缓冲存储器   CPU   目录表法   MESI协议  

摘要： 高速缓存一致性协议用于解决多个高速缓存的不一致性问题。基于目录的协议用于网络连接的系统,监听协议用于 总线连接的系统。本文探讨了其中几种常见的协议。

摘要： The scalability of a distributed shared memory systems is limited largely by com- munication overhead, most of which can be attributed to memory latency and synchroniza- tion. In systems built with dual-processor single-chip multiprocessors (CMPs) a proposed solution to this scalability limitation is the use of slipstream execution mode for certain applications. Instead of using the second on-chip processor to run a separate slice of the parallel application, slipstream mode utilizes the second processor to run a reduced ver- sion of the same task. The reduced version, known as the advanced stream, skips certain high latency events but continues to make accurate forward progress and provides future reference behavior for the unreduced version, known as the redundant stream. Slipstream mode provides several methods of synchronization between the ad- vanced (A-) and redundant (R-) streams to govern how far the A-stream can advance in front of the R-stream and also to provide a method of keeping the A-stream on the cor- rect control path. A current limitation of slipstream is that the method used for A-R synchronization must be specified by the user at run time and used throughout the entire execution of the program. This is because the method that results in the best performance is application dependant and unknown beforehand. We investigate alternate procedures to determine the A-R synchronization method by the use of static code analysis in the form of both profile- and compiler-driven techniques. A trace profile algorithm is presented that gives insight into shared memory access patterns that favor certain synchronization methods. We also discuss compiler integration of the synchronization method determination. Techniques similar to those which are used for compiler-driven prefetching and data forwarding are shown that could be used in this context as well.

关键词： 多处理器系统   可扩展性   体系结构   并行计算机   存储器  

摘要： 随着高度集成的处理器和存储器芯片半导体工艺技术的高速发展,多处理器系统已成为设计并行计算机体系结构的关键技术。本文研究多处理器系统带宽、时延、成本和物理的可扩展性,分析多处理器系统扩展的关键技术,最后给出可扩展的多处理器系统设计方案,并指出其将来的研究方向。

关键词： embedded systems   loop-dominated applications   scratch-pad memories (SPM)  

摘要： This paper presents a compiler strategy to optimize data accesses in regular array-intensive applications running on embedded multiprocessor environments. Specifically, we propose an optimization algorithm that targets at reducing extra off-chip memory accesses caused by interprocessor communication. This is achieved by increasing the application-wide reuse of data that resides in scratch-pad memories of processors. Our results obtained using four array-intensive image processing applications indicate that exploiting interprocessor data sharing can reduce energy-delay product significantly on a four-processor embedded system.

关键词： 并行计算   机群系统  

摘要： 使用机群建立原型、调试、运行并行应用程序越来越成为替代专用 ,特别是昂贵并行计算机平台的发展趋势。本文介绍了机群系统的组成。

关键词： 路由器   分布式消息队列   操作系统  

摘要： 为了适应基于分布式多处理器平台的路由器的应用需求 ,本文对高性能路由器操作系统 HEROS(Highly Effi-cient Router Operating System)进行了分布式扩展 ,实现了分布式的消息队列机制 ***是一种轻负载的 ,和传输介质无关的 ,具有容错能力的分布式消息通信机制 .基于 DMQ机制可以实现高性能的分布式分组转发 .该 DMQ机制已经用于国家“86 3”重大项目“高性能安全路由器”和“核心路由器”,取得了满意的效果 .

关键词： TigerSHARC   多处理器阵列   软件开发工具  

摘要： 分析了在基于TigerSHARC的多处理器阵列的软件开发过程中遇到的问题,设计了一套完整的软件开发工具软件,包括网络加载器、软件调试工具、系统诊断工具等,所支持的多处理器阵列中,TigerSHARC芯片的数量没有限制.