Question

Five batch Threads. A through E, occurred in a Process X at almost the same time. They have estimated running times of 10, 6, 2, 4, and 8 msec. For each of the following thread scheduling algorithms, determine the mean thread turnaround time. Ignore thread switching overhead.

A) Round robin. B) First-come, first-served (NP) (run in order 10, 6, 2, 4, 8).

Answer 1

SOLUTION-

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Solution. In. processes are mean. 41 Given estimated running time of 10, 6, 2, 4 and 8 min. A Round robin Id is Bremptive mus multiprogramming Starting all five each running, so they get 1/5 of the cpu, which Teach them take 5 minute longer to run. That means it takes 10 min for C. the complete i After do.min.cach.jab.will have used 2 minutes, so we see that & min left of A for B it 4 and D its 2 and È its 6. Since so each will get 1/4 the CPU time. so it takes 8min for DL 10 +8 = 18 min) A will have 6 min left, B has 2 left , E has 4 min left Each process 1/3rd CPU. B took 10+8+6=24 min A will have 4 min lift, E has 2 min left. Each gets ½ of E will finish in 4 min (E took 24+ 4 = 28 min) A has only 2 min.left to run., So Hotel -2 28+)- 30 min = (16+18+ 24 +28+30)/5 = 22 min Саи only 4 Jobs. left of Now, CPU. So Average

пии ch) first come first leaved- C Processes to completion in the order the order of Arsival) A complete after 10 min B completes after (10+6 ) = 16 min C completes after ( 16 + 2) = 18 min I completes after (18+ 4) = 22 min E completes after (22+8) = 30 min. Average = (10 + 15 + 16 + 22 + 30)/5 = 965 = 19.2

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