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This paper proposes a high-performance memory key-value database Redis++. In the memory management mechanism, Redis++ can apply and release a fixed-size memory segment from the system. The data in each memory segment is stored consecutively, and the memory is reclaimed based on the profit evaluation value. Secondly, a cache-friendly hash index structure is designed and the structure uses two-level index which can solve the hash collision to complete per search which needs cache mapping only once if possible. In addition, using the SIMD instruction set to realize instruction-level parallelism, which speeds up the search efficiency of the secondary index. The experiments prove the effect of Redis++ on memory utilization, system latency, and throughput.

A High Performance Memory Key-Value Database Based on Redis