Question

Urgent please:

A CPU scheduler can be either preemptive or non-preemptive. What does it mean to say it is “preemptive”?

Answer 1

What is Preemptive Scheduling?

Preemptive Scheduling is a planning technique where the errands are generally doled out with their needs. At times it is imperative to run an undertaking with a higher need before another lower need task, regardless of whether the lower need task is as yet running.

Around then, the lower need task holds for quite a while and resumes when the higher need task completes its execution.

What is Non- Preemptive Scheduling?

In this sort of planning technique, the CPU has been allotted to a particular cycle. The cycle that keeps the CPU occupied will deliver the CPU either by exchanging setting or ending.

It is the main strategy that can be utilized for different equipment stages. That is on the grounds that it doesn't require specific equipment (for instance, a clock) like preemptive Scheduling.

Non-Preemptive Scheduling happens when a cycle willfully enters the stand by state or ends.

KEY DIFFERENCES

• The Processor is assigned to the processes in Preemptive Scheduling for a fixed time frame, and the non-preemptive scheduling Processor is assigned to the process before it finishes.

• Tasks are switched based on priority in preemptive scheduling, although no switching takes place in non-preemptive scheduling.

• The Preemptive Algorithm has the overhead of moving the process from the ready state to the operating state, although there is no such overhead moving for Non-preemptive Scheduling.

• Although non-preemptive scheduling is static, preemptive scheduling is flexible.