CpuTime - Dr. A's Wiki

Back to ComputerTerms

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

$C P U_{S y s t e m} + C P U_{U s e r} = E l a p s e d T i m e + I / O T i m e$

$C P U E x e c u t i o n T i m e = \frac{C P U c l o c k c y c l e s f o r a p r o g r a m}{C l o c k R a t e}$