Neco 2021 Data Processing Question 9

Practice objective / multiple choice question 9 from the 2021 Neco Data Processing examination.

Neco 2021 Data Processing Objective / Multiple Choice Medium Difficulty
Question 9 NECO • 2021 • DATA_PROCESSING • objective

A computer operates with a clock speed of 2 GHz. Each instruction requires 1 fetch cycle, 2 decode cycles, 1 execute cycle and 1 store cycle (total 5 cycles per instruction). A program consists of 1.2 million instructions.\n\n(a) Calculate the total execution time of the program.\n(b) Which stage of the instruction cycle is the bottleneck, and why?

Answer Options

A. Total execution time = 2.5 ms. The fetch stage is the bottleneck because it occurs first in each instruction.
B. Total execution time = 3 ms. The store stage is the bottleneck because it uses 1 of the 5 cycles per instruction, the greatest share.
Correct Answer C. Total execution time = 3 ms. The decode stage is the bottleneck because it uses 2 of the 5 cycles per instruction, the greatest share.
D. Total execution time = 4 ms. The execute stage is the bottleneck because it requires the most complex operations.
Correct Answer
C
Correct Option:
Total execution time = 3 ms. The decode stage is the bottleneck because it uses 2 of the 5 cycles per instruction, the greatest share.

About This Question

This is Neco 2021 Data Processing Question 9. It is one of the objective questions from the 2021 Neco Data Processing examination.

Difficulty level: Medium .

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