file handles opend:

lsof | cut -f 1 -d ' ' | uniq -c | sort

run maxfiles limit

launchctl limit maxfiles

it should give you result like:

bartron ➜ ~/Users/bartosz launchctl limit maxfiles
maxfiles 256 unlimited

to up limit files run:

bartron ➜ ~/Users/bartosz sudo launchctl limit maxfiles 512 20000