Computer Science
CPU Execution Time
Estimate CPU execution time.
CPU Time = Instruction Count × CPI × Clock Cycle Time
Formula Explanation
Execution time depends on the number of instructions, average cycles per instruction and duration of a clock cycle.
Variables Explained
Instruction Count = Executed instructions; CPI = Average cycles per instruction.
Solved Example
A program executes 1,000 instructions with CPI 2 and cycle time 1 ns.
CPU time = 1000 × 2 × 1 ns = 2000 ns = 2 μs.