Multi-level Feedback Queue Scheduling Algorithm with Example | CPU Scheduling Algorithms in OS

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--------------------------------------------------------------------------------------------- In this CPU scheduling algorithm video tutorial we will study about Multi-level Feedback Queue Scheduling algorithm.

Multi-level Feedback Queue Scheduling Algorithm -
1. In a multilevel queue-scheduling algorithm, processes are permanently assigned to a queue on entry to the system. Processes do not move between queues. This setup has the advantage of low scheduling overhead, but the disadvantage of being inflexible.
2. Multilevel feedback queue scheduling, however, allows a process to move between queues.
3. The idea is to separate processes with different CPU-burst characteristics. If a process uses too much CPU time, it will be moved to a lower-priority queue.
4. Similarly, a process that waits too long in a lower-priority queue may be moved to a higher-priority queue. This form of aging prevents starvation.
5. Multilevel Feedback Queue Scheduling (MLFQ) keep analyzing the behavior (time of execution) of processes and according to which it changes its priority.

In general, a multilevel feedback queue scheduler is defined by the following parameters:
1. The number of queues.
2. The scheduling algorithm for each queue.
3. The method used to determine when to upgrade a process to a higher-priority queue.
4. The method used to determine when to demote a process to a lower-priority queue.
5. The method used to determine which queue a process will enter when that process needs service.

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