Linux Per-Process CPU Runtime Statistics

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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)