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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Hi Neso Academy, ur explanation is amazing. Pls upload remaining topics of this subject as well.

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Quickly understandable sir🤗🤗

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Stunning explanation

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6:29 Full volume replay

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[@TheYmBProduction]

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

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[@adarshrai9516]

Plzz make videos on Data Structure and Algorithm plzzz

[@faizjamaludin9279]

Very good explaination

[@nikolamalenovic1868]

Does arrival time specify which process comes first ?

[@yassinemaamri9818]

Thank you so much

[@ashishjena5778]

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

[@prernagarg5892]

Thank you so much Sir

[@farahmohamed2104]

another level nice one

[@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

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Thank you 🙏

[@gee20893]

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

[@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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The best

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

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Thank u sir

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Thankyou sir

[@ayushiydvKG]

yes clear

[@NaveedAhmed-xp3nu]

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

[@aniketsaha7273]

Gantt Chart?😂

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What is gantt chart

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Gantt chat 😂😂😂😂

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♥♥

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gantt chart???

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pano makuha yung arrival time thankyou po

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Please Sir implemented on C++ code easy method Please

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5

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