CODEWITHSUNDEEP
bashawkgrep
Andy
Andy

Reputation: 613

How to loop through processes and kill it if cpu usage is less than x

So my goal is to kill processes that get stuck transcoding media. All processes are monitored by runit so when the process gets killed - it gets restarted.

I can get the list of processes the following way:

ps aux | grep -v grep | grep ffmpeg | awk '{print $2, $3}'

What would I need to have any processes killed that returns <20 on $3 - in other words, process is using less then 20% of CPU?

Upvotes: 0

Views: 601

Answers (3)

Tiago Lopo
Tiago Lopo

Reputation: 7959

Another way of doing this:

ps axo comm,pid,pcpu | awk '/^ffmpeg/ && $3 < 20 {print $2}' | xargs -r kill -9

Upvotes: 0

repzero
repzero

Reputation: 8412

Another approach using using awk without grep

ps aux|awk '{if($11~ "ffmpeg" && $3<20.0){system("kill -9 "$2)}}'

($11~ "ffmpeg" && $3<20.0) # if field $11 (COMMAND column) matches "ffmpeg" and field $3 (PID column) is less than 20.0, kill PID no. which is in field $2

Upvotes: 1

Basile Starynkevitch
Basile Starynkevitch

Reputation: 1

pgreg(1) can give you a list of pids. So pgrep ffmpeg will give you a list (like e.g.2345 15678 9870) of pids of processes running ffmpeg. Hence ps u $(pgrep ffmpeg) gives you a process list.

You want to filter those processes running for less than 20% of CPU. Try

ps u $(pgrep ffmpeg) | awk '{if ($3 < 20.0) { print "kill " $2 }}'

This should give you several lines like kill 12345. Feed them to a shell:

  ps u $(pgrep ffmpeg) | awk '{if ($3 < 20.0) { print "kill " $2 }}' | sh

You probably could use pkill(1) and GNU awk function system. You may want to skip the title line output by ps u perhaps by giving also /USER/{next} to awk

Upvotes: 1

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