The other day, I was sitting in a coffee shop working, when I looked down to find that 25% of my battery was left.

I looked at my Activity Monitor and saw that the time machine process was going at 90% for a while (as long as I was watching it).

Are there any apps that can notify me if a process is at a certain level for a certain amount of time?


You could run a script like this every minute with cron or launchd:


current=$(ps -erco %cpu,command | tail -n+2 | sed 's/^ *//')
echo "$current" > $prefix$(date +%s)
a=($prefix*); for ((i=0;i<=${#a[@]}-3;i++)); do rm "${a[i]}"; done
[[ $(awk '{s+=$1}END{printf "%i",s}' <<< "$current") -lt $cpulimit ]] && exit
averages=$(awk '{cpu=$1;sub(/[^ ]+ /,"");a[$0]+=cpu;c[$0]++}END{for(i in a){printf "%.1f %s\n",a[i]/c[$0],i}}' $prefix* | sort -rn)
if [[ $(awk '{s+=$1}END{printf "%i",s}' <<< "$averages") -ge $cpulimit ]]; then
    terminal-notifier -title "CPU use" -message "$(head -n5 <<< "$averages" | paste -sd / -)"

If the average CPU use in the last three samples is over 50%, it uses terminal-notifier to display the processes that used the most CPU.

You could also use MenuMeters to display total CPU use in the menu bar:

Or run a script like this with GeekTool:

for i in {1..4}; do ps -erco %cpu,command | tail -n+2; sleep 1; done | sed 's/^ *//' | grep -v GeekTool | awk '{cpu=$1;sub(/[^ ]+ /,"");a[$0]+=cpu;c[$0]++}END{for(i in a){printf "%.1f %s\n",a[i]/c[$0],i}}' | sort -rn

Your Answer

By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.

Not the answer you're looking for? Browse other questions tagged or ask your own question.