Operating Systems Final

Phase 1

solution

average score: 35.37/50

Q1

Q2

Q3

Q4

• computation non-premtive
• I/O can't overlap
• shortest "computing" time
• 10
  • 3 -> 5 c -> 2
• 20
  • 6 -> 10 c -> 4
• 30
  • 9 -> 15 c -> 6
• CPU & I/O in parallel
• finishing time
  • total 41
  • p1 11
  • p2 24
  • p3 41

Q5

Q6

• non-preemptive
• turnaround time
  • 2, 6, 11, 19, 29
  • (2+6+11+19+29)/5 = 13.4
• waiting time
  • 0, 2, 6, 11, 19
  • (0+2+6+11+19)/5 = 7.6

Q7

Ans. 2 is free as it should be "minumum", not "maximum"

Q8

Phase 2

Question + Solution

The average/median scores are 39.18/40.50

Q1

Q2

Q3