Short-long-medium-term scheduling

Question

Describe briefly short, long and medium-term scheduling?

Answer 1

Long term scheduler finds out which programs are admitted to the system for processing. This controls the degree of multiprogramming. At one time admittance, the job becomes a process.

Medium term scheduling is segment of the swapping function. This relates to processes which are in a suspended or blocked state. They are swapped out of real-memory till they are ready to perform. The swapping-in decision is based on memory-management criteria.

Short term scheduler, also termed as a dispatcher performs most often, and creates the finest-grained decision of which process must perform next. This scheduler is invoked whenever an event happens. It might lead to interruption of one process by preemption.