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This new Non-Volatile Main Memory (NVMM) allows programmers to store data persistently in memory instead of in files, thereby providing a substantial performance boost. At the system level, I will discuss how data structures should be encapsulated as persistent memory objects (PMOs), and how PMOs can be programmed. However, persistency programming is complex and it is difficult to achieve good performance. In this talk, I will discuss various abstraction choices, including what is provided by Intel PMEM. 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