2 research outputs found
SplitFS: Reducing Software Overhead in File Systems for Persistent Memory
We present SplitFS, a file system for persistent memory (PM) that reduces
software overhead significantly compared to state-of-the-art PM file systems.
SplitFS presents a novel split of responsibilities between a user-space library
file system and an existing kernel PM file system. The user-space library file
system handles data operations by intercepting POSIX calls, memory-mapping the
underlying file, and serving the read and overwrites using processor loads and
stores. Metadata operations are handled by the kernel PM file system (ext4
DAX). SplitFS introduces a new primitive termed relink to efficiently support
file appends and atomic data operations. SplitFS provides three consistency
modes, which different applications can choose from, without interfering with
each other. SplitFS reduces software overhead by up-to 4x compared to the NOVA
PM file system, and 17x compared to ext4-DAX. On a number of micro-benchmarks
and applications such as the LevelDB key-value store running the YCSB
benchmark, SplitFS increases application performance by up to 2x compared to
ext4 DAX and NOVA while providing similar consistency guarantees