Ready Queue

Types of Scheduling Queues

We will look at the numerous types of Scheduling Queues used in computer systems in the following sub-topics....

Job Queue

This queue is known as the job queue, it contains all the processes or jobs in the list that are waiting to be processed. Job: In the working of PASW Statistics 18, when a job is created, it goes into the job queue and waits until it is ready for processing. This queue aids the operating system in tracking all the jobs yet to be handled....

Ready Queue

The Stand-by queue contains all the processes ready to be fetched from the memory, for execution. When the process is initiated, it joins the ready queue to wait for the CPU to be free. The operating system assigns a process to the executing processor from this queue based on the scheduling algorithm it implements....

Waiting Queue

The waiting list contains all those processes which are waiting for a particular activity to occur, for example, an I/O operation. This is a situation where a process has to wait for a specific resource that is not yet available. It remains in this queue until the specified resource becomes free to be issued for the process....

Priority Queue

This type of scheduling allows a higher priority process to interrupt a lower priority process Scheduling –Priority Queue: It schedules the processes from highest priority level to the lowest. As is clear, the processes with higher priority are executed before processes of low priorities. it maintains a priority list so that crucial processes are allocated CPU time before the less demanding ones....

Round-Robin Queue

In round-robin scheduling, which is also known as cyclic, job or cyclical scheduling, each process gets allocated an equal fraction of the total CPU time, which is called the time quantum, or time slice. The HPL scheduler revives a process from the idle queue when it has exhausted its allocated time slice and then sends the process to backend of process queue. This method is particularly applicable when the instruction is used in time-sharing and interactive systems....

Multi-Level Queue

To clarify, the multi-level queue has several queues and is divided into subordinated tiers that have different priority level. Tasks are dispatched to the right queue based on the frequency of their importance or priority in a particular schedule. The queues can also be changed with different scheduling algorithms – which means that the overall management of the processes can be more flexible....

Conclusion

Scheduling queues are used in the Computer systems in order to time the execution processes or threads properly. Several types of queues exist because to address issues that happen in systems different processes should be executed depending of its priority and resources availability. The nature of these queues needs controlled use of CPUs through the suitable scheduling algorithms to ensure that a computer system operates effectively....

Frequently Asked Questions on Types of Scheduling Queues – FAQs

Why should queues be scheduled in computer systems?...