多核处理器P2020的访存实时性分析与优化

摘要

多核处理器以其高集成度、高性能功耗比的特点，获得了军事、电信、网络等领域的关注，但多个处理核心对共享资源的抢占带来的实时性问题阻碍了多核处理器在上述领域的应用。面向实时性的代表指标———访存时间，以P2020为研究对象，分析了其实时性的影响因素，采用可变步长的模型，对各种影响因素进行了定量的测试与分析，为多核处理器访存实时性的优化提供了参考。%Multi-core processor has the characteristics of high integrated and high performance with low power,which attract several areas′attention such as military,telecommunications,network and so on.But there is a serious problem of real-time caused by the cores accessing the shared resources simultaneous-ly ,which counteracts the applications of multi-core processor in such areas .Faces the representative indi-cator of real-time,which is memory access time .With P2020 processor as the research prototype and ana-lyses its effect factors of real-time.Adopts a measurement model based on variable strides to quantifica-tionally test and analyze the effect factors .Provides references for optimizing the performance of memory access time .