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Multilevel Queue Scheduling

Posted on December 16, 2021December 16, 2021 By christo No Comments on Multilevel Queue Scheduling

A multilevel queue scheduling algorithm partitions the ready queue into several separate queues The processes are permanently assigned to one queue, generally based on some property of the process, such as memory size, process priority, or process type. Each queue has its own scheduling algorithm.

For example, separate queues might be used for foreground and background processes. The foreground queue might be scheduled by an RR algorithm, while the background queue is scheduled by an FCFS algorithm

Multilevel Feedback Queue Scheduling

The multilevel feedback queue scheduling algorithm, in contrast, allows a process to move between queues. The idea is to separate processes according to the characteristics of their CPU bursts. If a process uses too much CPU time, it will be moved to a lower-priority queue. This scheme leaves I/O-bound and interactive processes in the higher-priority queues. In addition, 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

In general, a multilevel feedback queue scheduler is defined by the following parameters:

  • The number of queues
  • The scheduling algorithm for each queue
  • The method used to determine when to upgrade a process to a higher priority queue
  • The method used to determine when to demote a process to a lower priority queue
  • The method used to determine which queue a process will enter when that process needs service

operating system Tags:Multilevel Queue Scheduling

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