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OOM killer: when memory runs out

cheat sheet · Ubuntu 24.04 · Linux 6.8 · systemd 255 https://lab.dimsanych.ru/en/wiki/oom-killer/

Cheat sheet

sudo journalctl -k -o cat | grep 'Killed process' who was killed
systemctl show app -p Result -p NRestarts Result=oom-kill
systemctl show app -p MemoryMax -p MemoryPeak limit and peak
cat /sys/fs/cgroup/system.slice/app.service/memory.events
choom -p 1234 score and adjustment of a process
sudo choom -n -500 -p 1234 protect a process from OOM
free -h available — the machine's memory reserve