DOKK / manpages / debian 12 / nocache / cachestats.1.en
CACHESTATS(1) CACHESTATS(1)

cachestats - print cache statistics for a file

cachestats [-qv] file

Print number of cached vs. not-cached pages.

Print verbose cache map, where each page that is present in the cache is marked with `x`.
The exit status is 0 (success) if the file is fully cached.

$ cachestats -v ~/somefile.mp3
pages in cache: 85/114 (74.6%)  [filesize=453.5K, pagesize=4K]
cache map:

0: |x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
32: |x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
64: |x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x| | | | | | | | | | | | |
96: | | | | | | | | | | | | | | | | | |x|

Also, you can use `vmstat 1` to view cache statistics.

March 2013 cachestats