Vault 2017

Jun He has performed a detailed vertical analysis of application performance atop a range of modern file systems and SSD FTLs. He has formalized the "unwritten contract" that clients of SSDs must follow to obtain high performance, and conduct the analysis to uncover application and file system designs that violate the contract. The analysis, which utilizes a highly detailed SSD simulation underneath traces taken from real workloads and file systems, provides insight into how to better construct applications, file systems, and FTLs to realize robust and sustainable performance. In this presentation, Jun He will present the methodology of the vertical analysis, as well as the insights learned from applications (e.g., LevedlDB, RockDB, SQLite-WAL, SQLite-RollBack, and Varmail), file systems (e.g. ext4, F2FS, and XFS) and SSD simulations.