2 – The CPU design team is designing an instruction set with three classes of instructions....

2 – The CPU design team is designing an instruction set with three classes of instructions. Parameters are given in the following table. Consider a program with 65% ALU instructions, 20% memory access instructions, and 15% control instructions. What is the average CPI for this CPU?

Clock Rate: 4GHz

CPI for ALU Inst.: 4

CPI for Memory Inst.: 8

CPI for Control Inst.: 2

Solutions

Expert Solution

ALU instructions=65% and CPI for ALU instruction=4

Memory access instructions=20% and CPI for Memory instruction=8

Control instructions=15% and CPI for control instruction=2

ICi=instruction count of type i

CPIi=cycle per instruction of type i

IC=total instruction count

n=number of different types of instruction

Fi=Frequency of instruction of type i

Here n=3

Frequency of ALU instructions=65%=0.65 =F1

Frequency of Memory instructions=20%=0.20 =F2

Frequency of Control instructions=15%=0.15 = F3

CPI1=4(For ALU inst.) , CPI2=8(For Memory inst.) , CPI3=2(For Control inst.)

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venereology answered 1 month ago

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