Friday, December 24, 2010

Operating System Support - Scheduling

Scheduling
  • Key to multi-programming
  • Long term
  • Medium term
  • Short term
  • I/O

 
Long Term Scheduling
  • Determines which programs are submitted for processing
  • i.e. controls the degree of multi-programming
  • Once submitted, a job becomes a process for the short term scheduler
  • (or it becomes a swapped out job for the medium term scheduler)
Medium Term Scheduling
  • Part of the swapping function (later…)
  • Usually based on the need to manage multi-programming
  • If no virtual memory, memory management is also an issue

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