Print cache statistics for a file
cachestats [-qv] file
Print number of cached vs. not-cached pages.
-v "Verbose mode"
Print verbose cache map, where each page that is present in the cache is marked with `x`.
-q "Quiet mode"
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.