cpulimit YAIT (Yet Another Impressive Tool)
Thursday Apr  2 11:26:47 2020
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One of the truly impressive tools I discovered this week is cpulimi
It allows you to limit how much cpu percentage a process can use. I
is specially indicated when running cpu intensive applications. In 
case it is 'ffmpeg'.

I use 'ffmpeg' on a daily basis to convert my .avi videos to .mp4. 
often run the script at night with cron.daily but the problem arise
when I need to run it during the day. Here comes cpulimit to the 
rescue:

 $ cpulimit -e ffmpeg -l 800 -b

Here is a quick explanation:

 -e ffmpeg (the process to limit)
 -l 800 (I have 16 cores: 800 = 50%)
 -b Run cpulimit in the background to free the terminal 

Really impressive (and handy)