Not a real issue: Thank you for making this!

[Chris Varenhorst]

The slowness of lsof on macOS has frustrated me for years. Only after spending more time using it on Linux did I realize it didn't even have to be this slow. I know you released this 7+ years ago, but even now in 2022 on macOS Monterey this works great for me.

Using lsof to check what process is still using a drive I'm about to unmount now takes 42ms on average instead of over a minute! benchmark results:

$ hyperfine --max-runs 3 'lsof_fast  +d /Volumes/Drive1' 'lsof  +d /Volumes/Drive1'  --ignore-failure
Benchmark #1: lsof_fast  +d /Volumes/Drive1
  Time (mean ± σ):      42.6 ms ±   2.1 ms    [User: 9.1 ms, System: 31.4 ms]
  Range (min … max):    41.2 ms …  45.1 ms    3 runs

Benchmark #2: lsof  +d /Volumes/Drive1
  Time (mean ± σ):     83.312 s ± 17.022 s    [User: 227.1 ms, System: 72203.7 ms]
  Range (min … max):   64.808 s … 98.305 s    3 runs

Summary
  'lsof_fast  +d /Volumes/Drive1' ran
 1953.86 ± 411.17 times faster than 'lsof  +d /Volumes/Drive1'

So anyway, thanks again for making this. Will close this not-a-real-issue now. Cheers!

[Jiří Zůna]

@varenc thank you, thats hearth-warming to hear! I had exactly the same problem, thus this tiny repo.
Makes me really happy that someone else, besides me, found this helpful.

Cheers!