DeLFS: A Decentralized Log-Structured File System for Manycores

This paper introduces DeLFS, a novel decentralized log-structured file system (LFS) designed for manycore scalability. DeLFS decentralizes metadata/data organization and management with an LFS-aware decentralized locking scheme that distributes lock ownership to eliminate global contention. In addition, DeLFS disentangles the critical path from the deferrable path to further increase concurrency. We implement DeLFS with three techniques in the Linux kernel and evaluate it on a 128-core machine. The experimental results show that DeLFS outperforms F2FS, MAX, and F2FSJ by up to 4.34×, 4.29×, and 4.50×, respectively, and delivers up to 2.00× higher sustained performance than ScaleLFS.