wang-qing@osdi21@USENIX

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#1 Nap: A Black-Box Approach to NUMA-Aware Persistent Memory Indexes [PDF] [Copy] [Kimi] [REL]

Authors: Qing Wang ; Youyou Lu ; Junru Li ; Jiwu Shu

We present Nap , a black-box approach that converts concurrent persistent memory (PM) indexes into NUMA-aware counterparts. Based on the observation that real-world workloads always feature skewed access patterns, Nap introduces a NUMA-aware layer (NAL) on the top of existing concurrent PM indexes, and steers accesses to hot items to this layer. The NAL maintains 1) per-node partial views in PM for serving insert/update/delete operations with failure atomicity and 2) a global view in DRAM for serving lookup operations. The NAL eliminates remote PM accesses to hot items without inducing extra local PM accesses. Moreover, to handle dynamic workloads, Nap adopts a fast NAL switch mechanism. We convert five state-of-the-art PM indexes using Nap . Evaluation on a four-node machine with Optane DC Persistent Memory shows that Nap can improve the throughput by up to 2.3✕ and 1.56✕ under write-intensive and read-intensive workloads, respectively.