CPU Performance Evaluation: Cycles Per Instruction (CPI)

EECC550 EECC550 --ShaabanShaaban#1 Lec # 3 Winter 2011 12-6-2011 CPU Performance Evaluation: CPU Performance Evaluation: Cycles Per Instruction (CPI) Cycles Per Instruction (CPI) Most computers run synchronously utilizing a CPU clock running at a constant clock rate:where: Clock rate = 1 / clock cycle The CPU clock rate dependson the specific CPU organization (design)and hardware implementation technology (VLSI)used. A computer machine (ISA) Instruction is comprised of a number of elementary or micro operationswhich vary in number and complexity depending on the the instructionand the exact CPU organization (Design). A micro operationis an elementary hardware operation that can be performed during one CPU clock cycle. This corresponds to one micro- Instruction in microprogrammed CPUs. Examples: register operations: shift, load, clear, increment, ALU operations: add , subtract, etc.

Dec 06, 2011 · (This equation is commonly known as the CPU performance equation) Or Instructions Per Cycle (IPC): IPC = 1/CPI Executed C = 1 / f AKA Dynamic Instruction Count. EECC550 - Shaaban #6 Lec # 3 Winter 2011 12-6-2011 CPU Average CPI/Execution Time For a given program executed on a given machine (CPU):

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