Linux Per-Process CPU Runtime Statistics

External

• https://stackoverflow.com/questions/16726779/how-do-i-get-the-total-cpu-usage-of-an-application-from-proc-pid-stat

Internal

• Linux CPU Info
• /proc/pid/stat

Overview

To determine total time spend by the process in user and kernel modes:

total-time-proc = utime + stime

If we want to include time from children processes:

total-time-proc-plus-children = total-time-proc + cutime + cstime

Running time for process (in seconds)

 process-running-time(seconds) = system-uptime(seconds) - (starttime / USER_HZ)

CPU usage percentage:

cpu-usage = (total-time-proc-plus-children / USER_HZ) / process-running-time * 100

Tools

novaordis-linux collector