Explain the features of major scheduling algorithms, Computer Engineering

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Explain the Features of Major scheduling algorithms.

The Features of Major scheduling algorithms is given below:

  1. FCFS - i.e. First come first served scheduling
  2. Shortest Job First scheduling (SJF)
  3. Priority scheduling
  4. Round robin scheduling

First come first served scheduling-

  • Process which request the CPU first is assigned CPU first
  • Managed through FIFO queue.
  • Average waiting time is usually long
  • Non-pre-emptive
  • For time-sharing systems, troublesome

Shortest job first (SJF)

  • The process that has the smallest CPU burst time gets first
  • This increases the waiting time of long processes.
  • Problem - difficult to predict the length of subsequent CPU request
  • May be non-pre-emptive or be preemptive

Priority

  • Highest priority process finds CPU allocation first
  • The larger the CPU burst then lowers the priority
  • Priority can be explained internally or externally
  • Can be non-pre-emptive or preemptive
  • Problem-starvation i.e. blocking of process
  • Solution-aging - raises the priority

Round robin

  • Time quantum from 10 100 millisecond is described
  • Processes are seem in circular queue
  • CPU allocation is divided between processes accordingly
  • Performance depends heavily upon time quantum
  • Pre-emptive

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