Question

What is the difference between non-preemptive and preemptive scheduling? Which technique would be suitable for a system which is used mainly for gaming application? Justify your answer.

Answer 1

Preemptive scheduling	non preemptive scheduling
Cpu is allocated to a process for a limited time	Cpu allocated to a process till it termimates or goes to waiting state
Process can be interrupted inbetin-be	Process cannot be interrupted till it terminates or switches to waiting state
Has switching overhead(context switching)	No switching overhead
Used in time sharing systems	Not used in time sharing systems
Cpu utilization is higher than non preemptive scheduling	Cpu utilization is very low
It is flexibe	it is not flexible
Round robin and SRTF are preemptive scheduling	FCFS is example of non preemptive scheduling

Non preemptive scheduling is best for the system which is mainly used for gaming application .

We can also use preemptive scheduling if we dont care more about the game and if it is ok for the game to halt ,if a more important os process is waiting.If we use preemptive ,game may close abruptly.