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Old 04-07-2007, 11:57 AM   #1
Registered: Nov 2005
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cpu usage


It has been asked a few times before on this forum, but none of the answers gave me a statisfying solution.

I want to make a function that returns the cpu usage in %. I can use getloadavg() which returns the load averages. But I dont want that because the loadavg can be bigger than 2 or 3 even with a single cpu.

And this:
#my_array=($(top -n 1))
#echo ${my_array[27]}
Gives me a different output on each pc.

What is a reliable way to get the cpu usage in linux using C++ (or just the command-line)?

Last edited by BackwardsDown; 04-07-2007 at 12:01 PM.
Old 04-07-2007, 02:02 PM   #2
koen plessers
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You might use conky to compare the values you get.


Koen Plessers
Old 04-07-2007, 02:09 PM   #3
Registered: Nov 2005
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Compare to what?

I am only able to get the load average, and when I try to extract the % with top every computer retuns something different (system, user, waiting, etc).
Old 04-07-2007, 03:31 PM   #4
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Have a look at /proc/stat to get CPU usage (user, nice, system and idle), loadavg is a different metric.
Old 04-07-2007, 05:51 PM   #5
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P Percentage of the CPU that this job got. This is just
user + system times divided by the total running time. It
also prints a percentage sign.
-- excerpt from man time
cheers, makyo


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