Transcription of CPU Performance Evaluation: Cycles Per Instruction (CPI)
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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.
Dec 06, 2011 · EECC550 - Shaaban #3 Lec # 3 Winter 2011 12-6-2011 • For a specific program compiled to run on a specific machine (CPU) “A”, has the following parameters: – The total executed instruction count of the program. – The average number of cycles per instruction (average CPI). – Clock cycle of machine “A” • How can one measure the performance of this …
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