Get process running CPU core and the utilisation on that core...

chamila1986 · 04-27-2010, 11:30 PM

Dear Sir,Madom,
Assume someone bind a particular process to a particular CPU core(In multi core machine) by using sched_setaffinity() like functions. Then how we can get that process running core id and CPU core utilisation of that process on that running CPU core(Pragmatically or by a Linux command)?. Any ideas please. Thank you.

mzsade · 04-28-2010, 01:19 AM

Install conky, if possible on your system, from synaptic. You can then change the ~/.conkyrc to suit you. Mine gives something like the text on the right in the Screenshot.

To get list of all running processes and their IDs run "ps -x" in the terminal.

chamila1986 · 04-28-2010, 01:42 AM

Dear Sir mzsade,
I need to get process running core id and CPU core utilisation to my own 'C' program... I'm stuck....

syg00 · 04-28-2010, 02:39 AM

Have a look in /proc/<pid>/stat
That will give you the number of jiffies used over a period - you'll have to calculate the percentage(s) yourself. If the process is bound to a particular processor, the "last used CPU" will always be the same.
Another option is to use cgroups and use the accounting that provides - documentation in the (kernel) source tree.

chamila1986 · 04-28-2010, 03:13 PM

Dear sir,

I get the file using,

Code:

$cat /proc/8876/stat

I got the output as,

Code:

8876 (BindMe) S 3303 8876 1680 0 -1 4194304 630 0 0 0 3 4 0 0 20 0 5 0 1727730 35446784 181 4294967295 134512640 134528576 3217712768 3217712496 7271458 0 4 4096 0 4294967295 0 0 17 0 0 0 0 0 0

So which value indicates the last used CPU?

PS: Can u give me the field names of these values(Any reference)?
(I referred http://lkml.org/lkml/2007/5/31/437. If u know a good reference please be kind enough to inform it to me.)

syg00 · 04-28-2010, 05:00 PM

"man proc" - then "/\/stat" (no quotes) will get you to the data of interest.