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CPU time reconginzes the distinctuion between WallClockTime and the time the CPU is actually doing calculations. CPU time is computing, not including the time waiting for I/O or other running programs. We kjnow that ResponseTime <> CpuTime!

CPU time can be further divided into:

   * system time - Time spent doing OS work
   * user time - Time spent executing user program

$$$CPU_{System}+CPU_{User}=Elapsed~Time + I/O~Time$$$

$$$CPU~Execution~Time=\frac{CPU~clock~cycles~for~a~program}{Clock~Rate}$$$

See also IoTime

   * See p26 Computer Architecture by Hennessy and Paterson
   * See p58 Compute organization

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