Exploration of memory page size for high-density flash memory
In recent years,solid state drives(SSDs)have witnessed rapid development towards high-er bandwidth and larger capacity.To expand SSD capacity,the size of flash memory pages has increased from 4 KB to 16 KB.However,operating systems still issue read/write requests to SSDs with a 4 KB memory page granularity,making it difficult for applications to fully utilize the high bandwidth of SS-Ds.Increasing the size of memory pages to align the granularity of I/O requests issued by the operating system with the SSD's flash memory read/write operations could be a potential solution.This paper delves into the effects of memory page size on system I/O performance and SSD lifetime for the first time,including setting the memory page size to 16 KB,running benchmark tests,and comparing the re-sults with those obtained using 4 KB memory pages.The key findings are as follows:(1)16 KB memo-ry pages exhibit better read performance;(2)the write granularity of applications determines the per-formance of 16 KB memory pages;(3)16 KB memory pages amplify the impact of invalid data within pages on SSD lifetime.
solid state drivehigh-density flashmemory managementmemory page sizeI/O per-formance test and analysis
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