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NIELIT 2016 DEC Scientist B (IT) - Section B: 56

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The degree of multi programming is controlled by:

  1. CPU Scheduler
  2. Long-term Scheduler
  3. Context Switching
  4. Medium term Scheduler
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It is also called a job scheduler. A long-term scheduler determines which programs are admitted to the system for processing. It selects processes from the queue and loads them into memory for execution. Process loads into the memory for CPU scheduling.

It also controls the degree of multiprogramming. If the degree of multiprogramming is stable, then the average rate of process creation must be equal to the average departure rate of processes leaving the system.

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Long term scheduler loads newly created processes into main memory. Number of processes in the main memory refers to the degree of multi programming. Hence, Degree of multi programming is controlled by long term scheduler.
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