Vibration fatigue of a vibration fatigue analysis is the modal analysis, that exposes the natural modes and frequencies of the vibrating structure and enables accurate prediction of the local stress responses for the given excitation. Only then, when the stress responses are known, can vibration fatigue be successfully characterized. The more classical approach of fatigue evaluation consists of cycle counting, using the rainflow algorithm and summation by means of the Palmgren-Miner linear damage hypothesis, that appropriately sums the damages of respective cycles. When the time history is not known, because the load is random ("e.g." a car on a rough road or
Cycles per instruction the number of clock cycles it takes to execute an instruction is 1/2 (CPI = 1/2 < 1). For the multi-cycle MIPS, there are five types of instructions: If a program has: then, the CPI is: formula_6 A 400-MHz processor was used to execute a benchmark program with the following instruction mix and clock cycle count: Determine the effective CPI, MIPS (Millions of instructions per second)rate, and execution time for this program. formula_7 formula_8 since: formula_9 and formula_10 formula_11 Therefore: formula_12 Cycles per instruction In computer architecture, cycles per instruction (aka clock cycles per instruction, clocks per instruction, or CPI)