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Xfast: Extreme File Attribute Stat Acceleration for Lustre
SessionHigh Performance I/O
DescriptionDirectory tree walks on parallel file systems are costly operations frequently required by many storage management tasks. Even listing the contents of a single directory can take minutes to hours for huge directories, as the tree walk performance of parallel file systems in Linux is severely throttled by sequentially accessing distributed metadata for each file through the syscall interface.
We present extreme file attribute stat (Xfast), which scales the performance of directory tree walks by combining techniques that have been developed over a time frame of 10 years for the Lustre file system. Scalable statahead predicts file access patterns and prefetches required attributes, while the Size on MDT (SOM) mechanism reduces the number of RPC calls to collect file attributes. Xfast improves the performance of common directory operations, e.g. reduces the time to list one million files from 11 minutes to less than one minute for a single process.
We present extreme file attribute stat (Xfast), which scales the performance of directory tree walks by combining techniques that have been developed over a time frame of 10 years for the Lustre file system. Scalable statahead predicts file access patterns and prefetches required attributes, while the Size on MDT (SOM) mechanism reduces the number of RPC calls to collect file attributes. Xfast improves the performance of common directory operations, e.g. reduces the time to list one million files from 11 minutes to less than one minute for a single process.
Authors
Event Type
Paper
TimeThursday, 16 November 20234:30pm - 5pm MST
Location401-402
Data Analysis, Visualization, and Storage
I/O and File Systems
State of the Practice
TP