In this paper, we comprehensively analyze the vertical and horizontal extensions of existing memory hierarchy. The difference between memory and big memory is well reported. We present the state-of-the-art studies upon the big memory systems, together with design methodology and implementations. Persistence is the first principle of big memory systems. We further show the full-stack and moving persistence.

翻译：本文系统性地分析了现有内存层次结构的纵向与横向扩展。我们详细阐述了内存与大内存之间的差异，综述了大内存系统的最新研究成果，并探讨了其设计方法与实现方案。持久性是大内存系统的首要原理，我们进一步展示了全栈持久化与移动持久化的技术内涵。