Comparison of Preemptive and Non preemptive scheduling

Comparison of Preemptive and Non-preemptive scheduling

Comparison of Preemptive and Non-preemptive scheduling are done on the basis of basic, interrupt starvation, overheads, flexibility, and cost.

BASIS	PREEMPTIVE SCHEDULING	NON PREEMPTIVE SCHEDULING
Basic	The resources are allocated to a process for a limited time.	Once resources are allocated to a process, the process holds it till it completes its burst time or switches to the waiting state.
Interrupt	The process can be interrupted in between.	The process cannot be interrupted until it terminates or switches to the waiting state.
Starvation	If a high priority process frequently arrives in the ready queue, the low priority process may starve	If a process with a long burst time is running CPU, then another process with less CPU burst time may starve.
Overhead	Preemptive scheduling has overheads of the processes.	Non-preemptive scheduling does not have overheads.
Flexibility	Flexibility Preemptive scheduling is flexible.	Non-preemptive scheduling is rigid.
Cost	Cost Preemptive scheduling is cost associated.	Non-preemptive scheduling has not cost associative.