new `lsof` usage is extremely slow in Cursor/VSCode integrated terminal

[maschwenk]

brew/Library/Homebrew/cmd/shellenv.sh

Line 21 in b64029d

HOMEBREW_SHELL_NAME="$(/usr/sbin/lsof -w -p "${PPID}" -a -d cwd -Fc | /usr/bin/sed -n "s/^c//p")"

I haven't quite gotten to the bottom of it yet, but these PRs

• Suppress warning from lsof #21164
• shellenv: prefer lsof to ps to read the command for a process #21157

have caused Cursor agent to be really slow when creating a new shell. On my machine where I have a lot of open files, this command takes almost 4 seconds, whereas in terminal.app it does not. I can't totally understand why this is happening but a few others can reproduce the same issue.

I appears that some aspect of the indirection of spawning shells inside Cursor makes the -p optimization not work well.

lsof is known to be very slow when:

• You have low disk space
• You don't use any of the flags that make it faster

so this may be something to raise to Cursor, but given a lot of folks use Cursor/VSCode, I think this is relevant

[maschwenk]

This ended up being related to Crowdstrike software, but lsof can be quite slow in a bunch of scenarios. Feel free to close, issue is googleable