Accuracy Mac OS
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Question or issue on macOS:
On Linux, ulimit -n can be used to change or view the limit on the number of file descriptors for a process, and lsof -p nnn wc -l seems to consistently report the actual file descriptor usage.
But on Mac OS X, lsof -p nnn wc -l can return a number higher than the limit. I suppose this means lsof is returning more than just file descriptors, but I can’t tell what’s what.
Bottom line: How can I get an accurate count of file descriptor usage in Mac OS X?
How to solve this problem?
Accuracy Mac Os X
Solution no. 1:
lsof can show a lot of things beyond just file descriptors, but most of what is likely inflating your count is the loaded frameworks and libraries for an application. You can look at the “FD” column to see if a line is a file descriptor–in which case it’s a number, possibly followed by a letter indicating the mode–or something else (see the description of the FD column in the lsof man page for the full list).
If you just need a rough approximation adding a ‘grep -v ” txt “‘ before your wc will get you a lot closer to an accurate value. If you need an exact value, you probably need to put together a regex to feed the output through that filers precisely by the FD column.
Solution no. 2:
I came across the need for identifying this recently – the command I used to count up the total entries (so more than just file handles, but its relative so therefore relevant imo) is:
This gives something like the following output (your highest used applications may be different!):
I usually only need to see the top 10 entries, but you can manipulate head to show as many lines as you like.
Solution no. 3:
I modified anders’ answer, now it only displays the opened fd numbers of a specific process:
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Example:
Solution no. 4:
Accuracy Microsensors
I was looking for which process that had lots of file descriptors – so I guess something like