Answer:
(A) The CPU time for J1 is =2 ms other time is =18 ms, for J2 CPU time =6 ms other time = 24 ms, for J3 CPU time = 3 ms and other time = 12 ms (B) The CPU Utilization for uni-programming is 0.203 or 20.3% (C) For Multi-programming, when a program is not free and busy with an operation, the CPU is allocated to other programs.
Explanation:
Solution
Given that:
A(1)Job J1 = CPU time = 2ms
Other time =18 ms
Total time = 20 ms
(2)Job J2 = CPU time 6ms
Other time = 24 ms
Total time = 30 ms
(3)Job J3 = CPU time = 3ms
Other time =12ms
Total time = 15 ms
(B) For the CPU Utilization for uni-programming, we have the following as follows:
CPU utilization =The total time of CPU/The total real time
Thus,
=(2 +6+3) / (18+24+12)
= 11/54
=0.203 or 20.3%
(C) For the CPU utilization for multi-programming, when a program is not available that is busy in an operation, such as the input and output the CPU can be allocated or designated to other programs
