Question

Suppose there are three programs A, B and C, which are executed in the order of A → B → C. the schedule of their "calculation" and "I / O operation" is shown in Table 1. It is assumed that the three programs use the same I / O device.
Program operate（unite: ms）
compute I/O compute
A 20 30 10
B 30 50 20
C 10 20 10

(1) Try to draw the time diagram of the three programs in a Simple Batch System, and calculate the total time and CPU utilization for completing the three programs.
(2) Try to draw the time diagram of the three program in multiprogramming and calculate the total time and CPU utilization of the three program.

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

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