Scheduling Algorithms - First Come First Served (FCFS)

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calculation of the waiting time has always confused me,but after watching this,I'm now okay.Thank you so much for this.

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[@fulcocrimson]

### 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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Professor in my college watch your videos too. He also pronounces it with same accent 'Gand chart'

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[@kadheermax1617]

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

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[@TheYmBProduction]

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

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Plzz make videos on Data Structure and Algorithm plzzz

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[@vasanthselvakumarr7175]

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

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Thank you so much

[@nikolamalenovic1868]

Does arrival time specify which process comes first ?

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Yeah

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It is very usefull because in my class time i am always in od so this is my class room😂

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thank you

[@ashishjena5778]

why the arival time of the process is not mentioned on the table? please do comment on this query

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Is it possible that you guys to upload the last few chapters?

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another level nice one

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Thankyou sir

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

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What is gantt chart

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gantt chart???

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Gantt Chart?😂

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pano makuha yung arrival time thankyou po

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6:29 I'm sorry what? 💀

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