Pipelined Query Processing Using Non-volatile Memory SSDs.

NVM Optane SSDs are faster than traditional flash-based SSDs and more economical than DRAM main memory, so we explore query processing with the inverted index on NVM aiming at reducing costs, but this leads to NVM-to-DRAM I/O which negatively affects the search engine’s responsiveness. To alleviate this problem, we propose a pipelining scheme to overlap CPU computation with NVM-to-DRAM I/O. We further propose some optimizations: variable coalesced block size, data prefetching, and block skipping.