I hail thee at all gurus here. please I av this crazy questions giving me headache, kind help me out ..

here goes the questions

QUESTION

1: Suppose that a context switch takes 10 milliseconds and that the quantum is set to 10 milliseconds. Why is this not an efficient value for the quantum? What would be better?

2: In the round robin scheme, what is the effect of using a very large quantum?

3: Suppose that the quantum is 1 millisecond and the time to context switch is 10 milliseconds. What is the effect?

QUESTION 4

Comparing the round robin scheduling algorithm and the FIFO algorithm, under what circumstances are these more or less equivalent?


Pls help cos google is not helping on thus

For you #1 question;
you know 1000ms is equal to 1 second, now having 10ms is very very very too small to have another/any instance to be noticed when it get called.
By the way, am coming from programming angle. if this is not programming related then Bleep it.

evaboy4real:
For you #1 question;
you know 1000ms is equal to 1 second, now having 10ms is very very very too small to have another/any instance to be noticed when it get called.
By the way, am coming from programming angle. if this is not programming related then Bleep it.

Yes bos, your contribution is fuckin welcome as is a programming related ish under the topic scheduling policy..

Thanks, for now I can only hope you help me more on this

huhmuhyehmi:
I hail thee at all gurus here. please I av this crazy questions giving me headache, kind help me out ..

here goes the questions

QUESTION

1: Suppose that a context switch takes 10 milliseconds and that the quantum is set to 10 milliseconds. Why is this not an efficient value for the quantum? What would be better?

2: In the round robin scheme, what is the effect of using a very large quantum?

3: Suppose that the quantum is 1 millisecond and the time to context switch is 10 milliseconds. What is the effect?

QUESTION 4

Comparing the round robin scheduling algorithm and the FIFO algorithm, under what circumstances are these more or less equivalent?


Pls help cos google is not helping on thus

This may come too late
My opinion
1. if the context switch and quantum are of the same time value, then it will take unnecessarily more time to finish a Round Robin scheduling because the quantum will be extra small for each processor to complete a task before moving to the next processor. In a nut shell, it is more acceptable to make d quantum higher than the context switch

2 Using a very large quantum can make the scheduling become a First Job First scheduling because, if there are 5 processors to be scheduled and each having 2,4,6,7,10 milisec to finish exec! if u place a quantum of say 40ms on them. then each process wud run to completion and round rubin is not accomplished.

3. quantum=1, context switch =10
u will have jobs finished in parts for a very long period of time. suppose u hav 4 processes wit 7,8,10,11 milisec to process, at the end of first round, job1remain 6ms, job2 7ms, job3 9ms, job4 10ms and u wud have spent 40ms on the four times the context switch occured. In the end, the CPU did 4ms of processing but wasted 44ms on the first round robin. In conclusion, lower quantum results in slow job completion

they are equivalent if the quantum is extremely large, as said in question 2.

I hope all these are still useful! COMPUTER OPERATING SYSTEM!