Answered Essay: four programs must be run on one computer. all programs consist of 2 processor cycles and 2 input / o

four programs must be run on one computer. all programs consist of 2 processor cycles and 2 input / output cycles. The input and output of all programs is done on the same disk drive. the times for each cycle of each program are shown below:

P1 3 10 3 12
P2 4 12 6 8
P3 7 8 8 10
P4 6 14 2 10
a)construct a time diagram showing which program is occupying the processor and the disk at each moment, until the 4 programs are finished. Assuming that the scheduling algorithm used is a time slice, with slices of 4 units of time

b)what is the processor and disk occupation rate?

slice time is slice with 4 units or Q=4units

Expert Answer


1.we suppose that each process arrive at t=0

p1,p2,p3,p4 are in the queue are executed in that way

p1 runs for 3 and goes for io and comes at t=13 at which it is placed others are also placed like that

the process is complted at t=49

the timing

p1 p2 p3 p4 p3 p1 p4 p2 p3 p2 p3 p4 p1 idle p2 idle p3 idle p4

time   0  3       7      11     15      18       21       23     27       31         33      37        39         39       41    41             47       47     49       49

2.the cpu is utilized for 39 out of 49.

the disk is not utilized for first 3 units which is 46 out of 49.

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