Cycles Per Instruction Average Cycles per Instruction (CPI) Average CPI = total number of clock cycles/ # of instructions executed Execution time [sec]= Clock cycle time 2CPI,*I, 1, =number of times instruction i is executed in a program ČPli= Average number of clocks to complete per instruction i Instruction Relative Frequency (F;) Average CPI =2CPI,* F, i= where F= instruction count F, =relative frequency of appearance of instruction i in a program Invest Resources where time is Spent! Caution: in pipelined machines, CPI = mean time between instruction completions! Unambiguous alternative: IPC

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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please explain it + provide calculation example

Cycles Per Instruction
Average Cycles per Instruction (CPI)
Average CPI = total number of clock cycles/ # of instructions executed
Execution time [sec)= Clock cycle time *
1 =number of times instruction i is executed in a program
CPli= Average number of clocks to complete per instruction i
Instruction Relative Frequency (F;)
Average CPI =LCPI,* F,
where F=
instruction count
F, =relative frequency of appearance of instruction i
in a program
Invest Resources where time is Spent!
Caution: in pipelined machines,
CPI = mean time between instruction completions!
Unambiguous alternative: IPC
Transcribed Image Text:Cycles Per Instruction Average Cycles per Instruction (CPI) Average CPI = total number of clock cycles/ # of instructions executed Execution time [sec)= Clock cycle time * 1 =number of times instruction i is executed in a program CPli= Average number of clocks to complete per instruction i Instruction Relative Frequency (F;) Average CPI =LCPI,* F, where F= instruction count F, =relative frequency of appearance of instruction i in a program Invest Resources where time is Spent! Caution: in pipelined machines, CPI = mean time between instruction completions! Unambiguous alternative: IPC
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