In order to eliminate the energy waste caused by the traditional static hardware multithreaded processor used in real-time embedded system working in the low workload situation, the energy efficiency of the hardware m...In order to eliminate the energy waste caused by the traditional static hardware multithreaded processor used in real-time embedded system working in the low workload situation, the energy efficiency of the hardware multithread is discussed and a novel dynamic multithreaded architecture is proposed. The proposed architecture saves the energy wasted by removing idle threads without manipulation on the original architecture, fulfills a seamless switching mechanism which protects active threads and avoids pipeline stall during power mode switching. The report of an implemented dynamic multithreaded processor with 45 nm process from synthesis tool indicates that the area of dynamic multithreaded architecture is only 2.27% higher than the static one in achieving dynamic power dissipation, and consumes 1.3% more power in the same peak performance.展开更多
To overcome the ever-increasing susceptibility to transient-fault in processors, various redundant multithreading （RMT） architectures have been proposed, which is becoming a most effective approach for detecting and...To overcome the ever-increasing susceptibility to transient-fault in processors, various redundant multithreading （RMT） architectures have been proposed, which is becoming a most effective approach for detecting and recovering from transient-fault. This paper surveys a wide range of RMT architectures-from the original AR-SMT（A-stream R-stream Simultaneous MultiThreading） to the most-recent SD-SRT （Slack-Decode Simultaneous Redundant Threading）, presenting traverse analyses and comparisons among them, and hereby demonstrates its evolution and tendency. Finally, some directions and suggestions are put forward for the further RMT research and development.展开更多
随着多核/众核处理器技术的快速发展,程序需要越来越多地采用多线程并行技术以提升性能。随着线程个数的增多,线程并行运行过程中相互间同步/互斥及资源竞争关系更加复杂,导致程序性能优化的难度增大。为了使编程人员直观地了解线程的...随着多核/众核处理器技术的快速发展,程序需要越来越多地采用多线程并行技术以提升性能。随着线程个数的增多,线程并行运行过程中相互间同步/互斥及资源竞争关系更加复杂,导致程序性能优化的难度增大。为了使编程人员直观地了解线程的动态运行过程,特别是线程间同步及资源共享带来的影响,帮助其进行程序性能优化,设计实现了一种面向Pthread的并行程序线程性能分析工具PPAT(Pthreads program analysis tool),该工具可在程序运行过程中动态获取线程运行及线程间互斥/同步信息,生成线程通信图,并以多种可视化的方法显示,为编程人员优化程序性能提供依据。展开更多
基金supported partially by the National High Technical Research and Development Program of China (863 Program) under Grants No. 2011AA040101, No. 2008AA01Z134the National Natural Science Foundation of China under Grants No. 61003251, No. 61172049, No. 61173150+2 种基金the Doctoral Fund of Ministry of Education of China under Grant No. 20100006110015Beijing Municipal Natural Science Foundation under Grant No. Z111100054011078the 2012 Ladder Plan Project of Beijing Key Laboratory of Knowledge Engineering for Materials Science under Grant No. Z121101002812005
文摘In order to eliminate the energy waste caused by the traditional static hardware multithreaded processor used in real-time embedded system working in the low workload situation, the energy efficiency of the hardware multithread is discussed and a novel dynamic multithreaded architecture is proposed. The proposed architecture saves the energy wasted by removing idle threads without manipulation on the original architecture, fulfills a seamless switching mechanism which protects active threads and avoids pipeline stall during power mode switching. The report of an implemented dynamic multithreaded processor with 45 nm process from synthesis tool indicates that the area of dynamic multithreaded architecture is only 2.27% higher than the static one in achieving dynamic power dissipation, and consumes 1.3% more power in the same peak performance.
基金Supported by the National Natural Science Foun-dation of China (60503015)
文摘To overcome the ever-increasing susceptibility to transient-fault in processors, various redundant multithreading （RMT） architectures have been proposed, which is becoming a most effective approach for detecting and recovering from transient-fault. This paper surveys a wide range of RMT architectures-from the original AR-SMT（A-stream R-stream Simultaneous MultiThreading） to the most-recent SD-SRT （Slack-Decode Simultaneous Redundant Threading）, presenting traverse analyses and comparisons among them, and hereby demonstrates its evolution and tendency. Finally, some directions and suggestions are put forward for the further RMT research and development.
文摘随着多核/众核处理器技术的快速发展,程序需要越来越多地采用多线程并行技术以提升性能。随着线程个数的增多,线程并行运行过程中相互间同步/互斥及资源竞争关系更加复杂,导致程序性能优化的难度增大。为了使编程人员直观地了解线程的动态运行过程,特别是线程间同步及资源共享带来的影响,帮助其进行程序性能优化,设计实现了一种面向Pthread的并行程序线程性能分析工具PPAT(Pthreads program analysis tool),该工具可在程序运行过程中动态获取线程运行及线程间互斥/同步信息,生成线程通信图,并以多种可视化的方法显示,为编程人员优化程序性能提供依据。
