Calculate CPU load limit on GNU/Linux

echo "$(( $(( $(grep 'physical id' '/proc/cpuinfo' | uniq | wc -l) * $(grep 'core id' '/proc/cpuinfo' | wc -l) )) * 2 + 1 ))"
shell order of operation example which calculates: x = number of physical CPU's y = number of cores per CPU 2(x * y) + 1 = CPU load limit
Sample Output
9

0
By: snorf
2015-11-14 20:44:39

What Others Think

Hmm... You can simplify the command a bit. You don't need grep AND wc in the second part, grep -c (count) will do: grep -c 'core id' '/proc/cpuinfo' You can drop the nested bash maths $(( $(( x * y )) * 2 + 1)) $(( x * y * 2 + 1)) Also, if you want, you can drop all the unnecessary quotes, leaving: echo $(( $(grep 'physical id' /proc/cpuinfo | uniq | wc -l) * $(grep -c 'core id' /proc/cpuinfo) * 2 + 1 )) . What I don't understand it what you're actually calculating. My laptop has one die, two cores (hyperthreaded): that's 4 (virtual processors). The command tells me "9". What should I do with this number?
flatcap · 258 weeks ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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