Re: CPU usage of particular process

[neha naik <nehanaik27@xxxxxxxxx>]

Does your machine have multiple CPUs?

Regards,
Neha

On Mon, May 20, 2013 at 4:05 AM, Rahul Bedarkar <rpal143@xxxxxxxxx> wrote:

Hi,

I am trying to write small program to get CPU usage for a particular process. My logic is to read user, nice, system, idle values from /proc/stat. Then read user and system time from /proc/<pid>/stat. Then wait for some time and again read same values. After that I am doing following calculations 

CPU% = (no_of_processor * (process_cpu_usage2-process_cpu_usage1) * 100 ) / (total_cpu_usage2-total_cpu_usage1)

When I compare my output with top, it looks like correct, but sometimes it is more than 100. Is my logic correct here ? Please correct me if I am worng.

Regards,

Rahul 

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