面向WCET分析的实时多核体系结构研究

随着工艺技术的发展以及嵌入式实时应用范围的不断扩大和需求的不断提升，多核处理器必将凭其高性能和低功耗特性应用到嵌入式实时领域中。但是，多核处理器体系结构很难甚至无法满足实时系统的实时限制和对WCET的可预测性要求。从多核中的共享资源入手，分析多核中的片上共享资源（共享Cache、片上互连）和片外共享资源（片外存储）对WCET分析的影响，探讨了各种干扰下的WCET分析方法。介绍了两种多核WCET分析模型：多核静态WCET分析模型和多核混合WCET分析模型；同时，针对嵌入式实时应用提出了多核设计原则。

Research of real time multi-core architecture for WCET analysis

With the development of technology and the increasing growth of applications and requirements in embedded real time systems, multi core processors will be adopted in embedded real time systems for its high performance and low power features. However, the multi core architecture is hard, even impossible to satisfy the requirement of real time and the predictability of WCET. Starting with the shared resources, we analyze the influence of on chip shared resources and off chip resources on WCET analysis, and discuss various WCET methods. Two WCET models are introduced: multi core static WCET model and multi core hybrid WCET model. At last, the multi core design rule for the real time application is proposed.