Question

In: Statistics and Probability

You are given the independent jobs A(5), B(7), C(10), D(12), E(6), F(4), G(3). (a) Using the...

You are given the independent jobs A(5), B(7), C(10), D(12), E(6), F(4), G(3).

(a) Using the alphabetical order priority list above, if the jobs are scheduled on 3 processors, what is the completion time?

(b) If the decreasing time algorithm is used to schedule the jobs on 3 processors, what is the completion time?

(c) If the decreasing time algorithm is used to schedule the jobs on 3 processors, which is the second job scheduled on processor 1?

A

b

c

d

e

f

g

Expert Solution

First we will sort the processes according to the alphabetical order and then in the decreasing time order.

Alphabetical order
Process	Time
A	5
B	7
C	10
D	12
E	6
F	4
G	3

Decreasing time
Process	Time
G	3
F	4
A	5
E	6
B	7
C	10
D	12

a) Therefore by the alphabetical queuing, the queues in the three processors would be

Process 1:A,D

Process 2:B,E

Process 3:C,F,G

Now the completion time of each of these queues is respectively (5+12)=17, (7+6)=13, (10+4+3) = 17. Hence the completion time would be the maximum time in these queues, which is 17.

b and c) Similarly for decresing time process:

Process 1:G,E,D

Process 2:F,B

Process 3:A,C

Now the completion time of each of these queues is respectively (3+6+12)=21, (7+4)=11, (5+10) = 15. Hence the completion time would be the maximum time in these queues, which is 21.

Also the second job scheduled on processor 1 is E.

orchestra answered 2 years ago

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