So the steps above will give the total CPU utilization since boot, which may or may not be useful to some. The times in /proc/stat are monotonically increasing, and begin at some point during the kernel's initialization (ie during boot up).
subtract the previous fraction from 1.0 to get the time spent being not idle. divide the fourth column ("idle") by the total time, to get the fraction of time spent being idle. sum all of the times found on that first line to get the total time. discard the first word of that first line (it's always cpu). From this information, we can, with a little effort, determine the current level of CPU utilization, as a percent of time spent in any states other than idle. One of these internal structures ( /proc/stat) includes information on the amount of time (in USER_HZ) spent in various states. Most Linux kernels provide a virtual /proc filesystem, providing an interface to various internal data structures. Taskĭisplay the current CPU utilization, as a percentage, calculated from /proc/stat. It is not yet considered ready to be promoted as a complete task, for reasons that should be found in its talk page. 
Linux CPU utilization is a draft programming task.
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