Cycles per instruction

In computer architecture, cycles per instruction (aka clock cycles per instruction, clocks per instruction, or CPI) is one aspect of a processor's performance: the average number of clock cycles per instruction for a program or program fragment. It is the multiplicative inverse of instructions per cycle.

Cycles Per Instruction is defined by the following:

${\displaystyle CPI={\frac {\Sigma _{i}(IC_{i})(CC_{i})}{IC}}}$

Where ${\displaystyle IC_{i}}$ is the number of instructions for a given instruction type ${\displaystyle i}$, ${\displaystyle CC_{i}}$ is the clock-cycles for that instruction type and ${\displaystyle IC=\Sigma _{i}(IC_{i})}$ is the total instruction count. The summation sums over all instruction types for a given benchmarking process.

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