Abstract
We present uFS, a user-level filesystem semi-microkernel. uFS takes advantage of a high-performance storage development kit to realize a fully-functional, crash-consistent, highly-scalable filesystem, with relative developer ease. uFS delivers scalable high performance with a number of novel techniques: careful partitioning of in-memory and on-disk data structures to enable concurrent access without locking, inode migration for balancing load across filesystem threads, and a dynamic scaling algorithm for determining the number of filesystem threads to serve the current workload. Through measurements, we show that uFS has good base performance and excellent scalability; for example, uFS delivers nearly twice the throughput of ext4 for LevelDB on YCSB workloads.
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Liu, J., Rebello, A., Dai, Y., Ye, C., Kannan, S., Arpaci-Dusseau, A. C., & Arpaci-Dusseauu, R. H. (2021). Scale and Performance in a Filesystem Semi-Microkernel. In SOSP 2021 - Proceedings of the 28th ACM Symposium on Operating Systems Principles (pp. 819–835). Association for Computing Machinery, Inc. https://doi.org/10.1145/3477132.3483581
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