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 us  --  User CPU time

      The time the CPU has spent running users' processes that are not niced.



    sy  --  System CPU time

      The time the CPU has spent running the kernel and its processes.



    ni  --  Nice CPU time

      The time the CPU has spent running users' proccess that have been niced.



    wa  --  iowait

      Amount of time the CPU has been waiting for I/O to complete.



    hi  --  Hardware IRQ

      The amount of time the CPU has been servicing hardware interrupts.



    si  --  Software Interrupts

      The amount of time the CPU has been servicing software interrupts.



    st  --  Steal Time

      The amount of CPU 'stolen' from this virtual machine by the hypervisor for other tasks (such as running another virtual machine).

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