关键词: 非一致Cache, 线延迟, 局部性, 多核, 非一致存储访问, 全Cache存储结构

Abstract:

Because of the memory wall problem, cache memory technologies have been very important. In the future, growing wire delays will become one of the key factors restricting the design of large caches. To provide a uniform access delay, the traditional cache design methodology has to accommodate cache access time to the farthest cache bank from processors. Thus, researchers proposed a kind of NonUniform Cache Architecture (NUCA), which is almost the inevitable outcome in intending processors. If a processor hits the data  stored in the nearby banks of NUCA, the cache access time will be short. Otherwise, the access time will be long. This paper summarizes the origin, development and typical cases of NUCA. It is important that two memory technologies of multiprocessors, from which the research of NUCA may borrow ideas, are introduced. Finally, the key problems of the NUCA research as well as solutions are proposed in the authors' opinion.

Key words: NUCA;wire delay;locality;multicore;NUMA;COMA