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In computer architecture, Cycles per instruction (clock cycles per instruction or clocks per instruction or CPI) is a term used to describe one aspect of a processor's performance: the number of clock cycles that happen when an instruction is being executed. It is the multiplicative inverse of Instructions Per Cycle.
It can be taken as an average over a typical sequence of instructions. In any case, it is better used when applied to RISC processors. In these processors, theoretically, most instructions should be able to complete in one computer cycle.
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