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| {{{ CPU + CPU = ElapsedTime + I/O Time System user }}} |
$$$CPU_{System}+CPU_{User}=ElapsedTime + I/O~Time$$$ $$$CPU~Execution~Time=\frac{CPU~clock~cycles~for~a~program}{Clock~Rate}$$$ |
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| See p26 Computer Architecture by Hennessy and Paterson See p58 Compute organization |
* See p26 Computer Architecture by Hennessy and Paterson * See p58 Compute organization |
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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
$$$CPU_{System}+CPU_{User}=ElapsedTime + I/O~Time$$$
See also IoTime
- See p26 Computer Architecture by Hennessy and Paterson
- See p58 Compute organization
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