btdu is a sampling disk usage profiler for btrfs. It works according to the following algorithm:
- Pick a random point on the disk in use
- Find what is located at that point
- Add the path to the results
- Repeat the above steps indefinitely
- Though it works by taking random samples, it is “eventually” accurate.
It differs from classic analyzers through the following properties:
- btdu starts showing results instantly. Though wildly inaccurate at first, they become progressively more accurate the longer btdu is allowed to run.
- btdu analyzes entire filesystems only. There is no way to analyze only a particular subdirectory or subvolume.
- btdu counts extents used by multiple files only once. (The shortest path is used when placing the sample in the tree for visualization.)
- By nature of its algorithm, btdu works correctly with compression and other btrfs filesystem features.
- Because it queries raw filesystem metadata, btdu requires root privileges to run.
This is free and open source software.
Website: github.com/CyberShadow/btdu
Support:
Developer: Vladimir Panteleev
License: GNU General Public License v2.0
btdu is written in D. Learn D with our recommended free books and free tutorials.
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