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topshows the CPU "running" a process or thread. If a process is using 10% of a CPU, then 90% of the time no CPU is running it.topcan show you the "Last used CPU", but with a warning that even asking is likely to alter the outcome across the whole system. Forps, the thread cumulative CPU time is found from the time between entry and exit of user mode (not continuously updated). CFS deals with variable time-slices, and longest appears to be capped at 0.006 secs, which means any separate process attempting to monitor is hopelessly lagging behind.