Multiple choice

Which of the following scheduling mechanisms controls the degree of multiprogramming?

  1. Long-term scheduling

  2. Medium-term scheduling

  3. Short-term scheduling

  4. All of these

  5. None of these
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A Correct answer
Explanation

Long term scheduler determines which programs are admitted to the system for processing. It controls the degree of multiprogramming. Once admitted, a job becomes process. Medium term scheduling is part of the swapping function. This relates to processes that are in a blocked or suspended state. They are swapped out of real-memory until they are ready to execute. The swapping-in decision is based on memory-management criteria.Short term scheduler, also known as dispatcher executes most frequently, and makes the finest-grained decision of which process should execute next. This scheduler is invoked whenever an event occurs. It may lead to interruption of one process by preemption.

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