컴퓨터구조 2장 CISC, RISC 등 연습문제 풀이 해석
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2.12 Early examples of CISC and RISC design are the VAX 11/780 and the IBM RS/6000, respectively. Using a typical benchmark program, the following machine characteristic result:
Processor
Clock Frequency
Performance
CPU time
VAX 11/780
5 MHz
1 MIPS
12 x seconds
IBM RS/6000
25 MHz
18 MIPS
x seconds
The final column shows that the VAX required 12 times longer than the IBM measured in CPU time.
a. What is the relative size of the instruction count of the machine code for this benchmark program running on the two machines?
CPU Time= Instruction Count * CPI * Clock Cycle Time이므로
Instruction Count = CPU time / (CPI * Clock Cycle Time) 이다. 따라서 VAX 11/780 : 12x / ((5/1) * (1/5)) = 12x
IBM RS/6000 : x / ((25/18) * (1/25)) = 18x
그러므로 12x : 18x 는 2:3 이므로
IBM RS/6000이 VAX 11/780 보다 Instruction count의 사이즈가 1.5배 크다.
b. What are the CPI values for the two machines?
CPI(Clock Per Instruction) = Clock rate/ MIPS 이므로
VAX 11/780 : (5 MHz) / ((1 MIPS) = 5
IBM RS/6000 : (25 MHz) / ((18 MIPS) ≅ 1.39
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