Difference between short term long term and medium term in OS?

Answer 1

Long-Term SchedulingLong-term scheduling performs a gatekeeping function. It decides whether there's enough memory, or room, to allow new programs or jobs into the system. It limits the degree of multi-tasking to prevent slow performance on currently-running programs. When a job gets past the long-term scheduler, it's sent on to the medium-term scheduler. Medium-Term SchedulingThe medium-term scheduler makes the decision to send a job on or to sideline it until a more important process is finished. Later, when the computer is less busy or has less important jobs, the medium-term scheduler allows the suspended job to pass. Short-Term SchedulingThe short-term scheduler takes jobs from the "ready" line and gives them the green light to run. It decides which of them can have resources and for how long. The short-term scheduler runs the highest-priority jobs first and must make on-the-spot decisions. For example, when a running process is interrupted and may be changed, the short-term scheduler must recalibrate and give the highest-priority job the green light.