Shortest Job First Scheduling Algorithm || SJF || Shortest Process Next || SPN || Non Preemptive| OS

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[ajayadithya]

P4 burst time is less than all the process then why you have taken po process first

[killer]

To whoever who is confused as of to why, after P0, the p1 process is taken in consideration, the reason is as follows :

"Firstly, at 0th second, only one process is available in the ready queue, which is p0. So, p0 will be executed first.
Secondly, the time taken i.e Burst time for the p0 i.e the total time taken to complete the execution of p0 process is 3 seconds.
So, in these 3 seconds of execution, look at the arrival times column. Which process has loaded into the ready queue during the 3 seconds?
Only p1 process is there in the ready queue in the 3 seconds.
That is why, p1 process was considered and not p4.
Because, look at p4's arrival time.
It is going to arrive into the ready queue at 8th second, but only 3 seconds have been passed.

To make it simpler for you to understand what is going on, think about two scenarios happening simultaneously
"In your left, there is ready queue. In this ready queue, the process are being loaded.
In your right hand, the CPU is being assigned to the Process from the left hand, and being executed.
During the time when the CPU executes the process, the processes continue to be loaded into the left hand i.e ready queue"

I hope I have put it in more sensible words and in more simpler words for you to understand and I hope that I have cleared your doubt.

Gimme a like if I did :>

And aswell, thank you sir.

[maneeshadesetty]

As you said we have to check shortest burst time then p4 has burst time 2 then you have taken p0

[likithareddylikky]

Thanks for every video sir after completion of my exams I will share with all my contacts to subscribe... Now I completed 75% of syllabus because of you .. It is very easy to understand😉

[dharanidharani]

Thanks a lot sir no more words to express my gratitude sir 🥺✨

[birukanley]

I have been looking someone like you .
you did it

[felipegalvezcarrasco]

thank you teacher, greetings from Chile

[mugilan_sakthi]

Tq so much sir your teaching way good keep going sir

[speci]

Sir tqsm
Ur teaching was best n we r getting better way than our cls lectures 😇tqsm

[potnurukanakarao]

You're Teaching is awsome sir.
Belive me, You are helping a lot of students For better scorings in their examinations.
Already subscribed your channel from 2 accounts. Thankyou For all your lectures.

[runallinonechannel]

P1 burst time is high compare to others then y taken sir

[VishnuVardhan-xdjc]

Meeru cheppali anukuntunna content and explanation good sir. But meeru total english kaakundaa telugu lo kuda chepthey baaguntundhi sir. It my openion sir...

[navyasrimuthireddy]

Sir meru shortest burst time will be executed first Ani chepparu kadha
Mari problem lo p0 having 3 and P1 having 6 kadha sir mari Gantt chart lo p0 tarvatha P1 ni arrive chesaru enti sir p0 having 3 but shortest job first is p4 that having burst time 2only p4ni p1tarvatha arrive chesaru Mari sjf antey processes which is having shortest burst time ani chepparu kadha pls answer my question sir....

[vineethatummala]

But p4 has least burst time than p1.then why did you consider p1 first?

[klaidanedeguzman]

thank you so much.. your better than my prof hahaha

[LeonArts]

Thank you man, but i've one problem that i can't solve, maybe you can help me:

We have to use Shortest Process Next with aging technique,
estimate the execution time of T3 knowing the previous T0, T1, T2:
(some examples)
1. T0=10ms T1=30us T2=0, 015ms
2. T0=200us T1=300ns T2=0, 015ms
3. T0=0, 05ms T1=30ns T2=40us

[mangamurigayathri]

Sir?? Can a sjf preemptive work if we r given a data without arraival time???

[leelakrishnamohan]

What if arrival time is non 0 then which will consider 1st

[AdeshShelar]

My question is in SJF non preemptive A.T is all 0 then Gantt chart is ?

[nithyareddyvlogs]

How can we know that the processes are in ready queue or not ? sir Plz reply i have exam tomorrow