#Utime and stime stat how to

Utime, stime, cutime, cstime, starttime used for getting cpu usage and obtained from /proc//stat file. There is two versions simple monochrome(fast) and colored version(little bit slow, but useful especially for monitoring the statе of processes). It is a linux/unix system monitor and process manager through procfs, like ' top' or ' ps'. Here is my simple solution written in BASH.

#Utime and stime stat how to

How to get total cpu usage in Linux (c++)Ĭalculating CPU usage of a process in Linux Top and ps not showing the same cpu result Next we get the total elapsed time in seconds since the process started: seconds = uptime - (starttime / Hertz)įinally we calculate the CPU usage percentage: cpu_usage = 100 * ((total_time / Hertz) / seconds)

If we do, then we add those values to total_time: total_time = total_time + cutime + cstime We also have to decide whether we want to include the time from children processes. The sysconf(_SC_CLK_TCK) C function call may also be used to return the hertz value.įirst we determine the total time spent for the process: total_time = utime + stime.In most cases, getconf CLK_TCK can be used to return the number of clock ticks.Hertz (number of clock ticks per second) of your system.#22 starttime - Time when the process started, measured in clock ticks.#17 cstime - Waited-for children's CPU time spent in kernel code (in clock ticks).#16 cutime - Waited-for children's CPU time spent in user code (in clock ticks).#15 stime - CPU time spent in kernel code, measured in clock ticks.#14 utime - CPU time spent in user code, measured in clock ticks.To calculate CPU usage for a specific process you'll need the following: