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
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
Section: Chapter Questions
Problem 1PE
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