Question

a-) Draw the gantt chart and computecpu waiting time using preeptive-priority algorithm for the cpu I/O device is using FCFS. Compute cpu utilization as well.

comp 214 2019/2020 Summer School Assignment 1 Priority Arrival Time 4 cpu 12 cpu 6. 3 3 P2 2 4 2 4 loane P3 4 ㅋ 8 6 5 2 P4 2 7 Draw the (pu waitin Gannt chart and compute times using preem, siue -priority FCFS algorithm for the cpu. To device is using Compute cpu utilization as well. (50p) Arrival Time pu b) P 12 P2 elman Yo cpu 3. 6 2 니 5 8 O 4 6 P3 7 2 7 Draw the Gantt Chart and compute cpu waiting times using round-robin algorithm for the cpu where time quantum is 3 milliseconds Compute cpu utilization as well. (sop)

b-) Draw the gantt chart and compute cpu waiting time using round-robin algorithm for the cpu where quantum is 3 milli seconds. Compute cpu utilization as well.

Answer 1

CPU Time Time 3 4 39 35 a) Preemptive Prievity with fees. Here Pa's prievity is highest Process Priority Amival i/cPul completion Turn Around waiting 60 Roxx 60 $ 8 #o Pi 14 40 2. Pa o 44x0 40 30 7 19 P3 o P4 2 2 50 - 48 38 Pal....6 ... 33 P...48 P2 P2 | Pi PP2 Pg 7 Р. 26 30 P4 724 18 33 39 40 47 48 50 - .:18 Turn around time = completion time - anival time waiting time - Turn around time CPU + t/o+cPv) 74 not CPU utilization Time for which CPU is idle 2100 running time Total CPU rur . 49*100 50 = 98%

b) RR with TQ = 3 Process Assival CPU lilo CPU completion Tun Waiting Time Tinle Around Time P 4 3 to 47 43 22 27 27 17 Pa 0 42 23 P3 7 Axo xo Axo 27 % 80 862 49 Faro Xo 170 P4 32 30 2 20 Ready. 86, 74, 74.8.14 96.44.946/34 PS, X, Y, P1, is .. (P2)...24 38 Pal P4 P2 | Pi P4 | P3 Pa Pi P4|P3 | P2 P. IP4 P o 13 16 19 22 23 26 27 30 32 35 (23) ..31 35 В |R | Pa P P₃ 38 41 49 CPU utilization is 100% since the CPU is never idle. 44 47

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