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Old 08-11-2009, 12:43 PM   #1
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problem with process time calculation

i'm writing a code to calculate cpu time consumed by a process. i've put the calculations inside a while loop which executes till cpu usage reaches a required value.

i'm using /proc/[pid]/stat (utime and stime field) to find process time. now since the while loop runs infinitely the usage reaches 100% quickly and i'm not able to verify the values.

is there a way to make it gradual increase?
also if i use sleep() in the loop the the process cpu times in /proc/[pid]/stat become zero

please help!!!
Old 08-11-2009, 12:56 PM   #2
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There is a utility "time".
time yourprocess
will show you the time used by yourprocess. If this is not what you're looking for, I'd recommend to download the sources of the time-utility and study this.

Old 08-11-2009, 01:02 PM   #3
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What is this "process" ?

Are you aware of time ?
time ls -al
real    0m0.035s
user    0m0.010s
sys     0m0.004s

Last edited by tredegar; 08-11-2009 at 01:02 PM. Reason: I type too slowly!
Old 08-11-2009, 01:05 PM   #4
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if i use time command in my loop will it give real time cpu usage, since i need to check if a particular cpu% is reached.

or will it give the percentage only at the end.



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