Added oom blog article

content/blog/miscellaneous/investigating-oom.md

@@ -0,0 +1,35 @@
+---
+title: How to list oom killer score of running linux processus
+description: a shell command that could be a one liner
+date: 2021-10-05
+tags:
+- linux
+- toolbox
+---
+
+## Introduction
+
+There seems to be a missing piece for investigating what the oom killer will do when a linux kernel will run out of memory. Since oom_scores can be adjusted, looking at memory consumption is not enough to get a clear picture.
+
+## The command
+
+The base of the command came from a colleague, I refined it with the sort and tail :
+```sh
+while read -r pid comm; do
+	printf '%d\t%d\t%s\n' "$pid" "$(cat /proc/$pid/oom_score)" "$comm"
+done < <(ps -e -o pid= -o comm=)|sort -n -k2|tail
+```
+
+On a busy server, the output will look like :
+```
+306	2	systemd-journal
+673	2	haproxy
+616	6	puppet
+8370	7	mcollectived
+1728	8	varnishncsa
+14652	9	php-fpm7.2
+14668	10	php-fpm7.2
+14653	13	php-fpm7.2
+1415	186	cache-main
+29124	313	mysqld
+```