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Module 2: Processes & Scheduling

20252m

Which scheduler selects processes from the ready queue and allocates the CPU?

(i) Long-term scheduler
(ii) Medium-term scheduler
(iii) Short-term scheduler
(iv) Batch scheduler

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Answer: (iii) Short-term scheduler (CPU scheduler)

  • Long-term: selects jobs from job pool to ready queue (controls degree of multiprogramming)
  • Medium-term: swapping (suspend/resume)
  • Short-term / CPU scheduler: selects process from ready queue and allocates CPU via dispatcher (runs most frequently, must be fast)
  • Batch scheduler is not an OS scheduler type.

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