CLoF: A Compositional Lock Framework for Multi-level NUMA Systems

Efficient locking mechanisms are extremely important to support large-scale concurrency and exploit the performance promises of many-core servers. Implementing an efficient, generic, and correct lock is very challenging due to the differences between various NUMA architectures. The performance impact of architectural/NUMA hierarchy differences between x86 and Armv8 are not yet fully explored, leading to unexpected performance when simply porting NUMA-aware locks from x86 to Armv8. Moreover, due to the Armv8 Weak Memory Model (WMM), correctly implementing complicated NUMA-aware locks is very difficult.