A common and easier way to deploy parallel filesystem is using the user-space file system framework (FUSE). However, it serves as an I/O interposition layer which crosses user and kernel space that may introduce significant overhead due to the user-kernel mode switches, context switches and additional memory copies. This paper designs a method based on dynamic linking techniques to bypass FUSE, and implements the interposition layer in user space. This method is implemented and evaluated in parallel log-structured file system which is a popular parallel file system for checkpointing. The experiments and evaluation show that it can improve 131% of the read performance when the transfer block size is large, and improve 5 times write performance at small transfer block size and guarantee no significant write performance downgrade in other scenarios.
DENG Tongliang
,
CHEN Chen
,
YIN Shu
. On the efficiency of user-level parallel file systems[J]. Journal of University of Chinese Academy of Sciences, 2022
, 39(2)
: 275
-282
.
DOI: 10.7523/j.ucas.2020.0027
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