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| {{{ CPU + CPU = ElapsedTime + I/O Time System user |
[[latex2($$CPU_{System}+CPU_{User}=ElapsedTime + I/O~Time$$)]] |
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| CPU clock cycles for a program CPU Exceution Time = ------------------------------ Clock Rate }}} |
[[latex2($$CPU~Execution~Time=\frac{CPU~clock~cycles~for~a~program}{Clock~Rate}$$)]] |
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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
latex2($$CPU_{System}+CPU_{User}=ElapsedTime + I/O~Time$$)
latex2($$CPU~Execution~Time=\frac{CPU~clock~cycles~for~a~program}{Clock~Rate}$$)
See also IoTime
- See p26 Computer Architecture by Hennessy and Paterson
- See p58 Compute organization
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