Scheduling Algorithms - First Come First Served (FCFS) 

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### First Come First Served (FCFS) - simplest algorithm - FIFO (first in first out) queue - new process enters queue, its PCB is linked onto tail - waiting time is long - fcfs scheduling algorithm is nonpreemptive (if cpu has been allocated, process keeps the cpu until release) - problematic for time-sharing systems (each user cannot get a share of the cpu) | Process | Burst Time ms | |---------|---------------| | p1 | 24 | | p2 | 3 | | p3 | 3 | waiting times: - p1 = 0 ms - p2 = 24 ms - p3 = 27 ms - average = (0+24+27)/3 = 17 ms change order to p2 -> p3 -> p1: waiting times: - p1 = 6 ms - p2 = 0 ms - p3 = 3 ms - average = (6+0+3)/3 = 3 ms

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6:29 Full volume replay

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Is burst time you shown in this video example includes both the time for I/0 burst and CPU Burst?

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Does arrival time specify which process comes first ?

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important notes: The average waiting time under the FCFS policiy , however is quite long

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Pls can you clear that waiting time of p3 is 6 in 2nd gant chart u said how it comes?

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when you upload remaining scheduling alogorithem........

Gantt Chart?😂

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