Round-Robin Scheduling

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Questions and Answers

What is the purpose of round-robin scheduling in computer operating systems?

The purpose of round-robin scheduling in computer operating systems is to allocate CPU time to multiple processes in a fair and balanced manner, ensuring that no process monopolizes the CPU for an extended period of time.

How does round-robin scheduling work in network packet switching?

In network packet switching, round-robin scheduling is used to allow every active data flow with packets in the queue to take turns in transferring packets on a shared channel in a periodically repeated order, ensuring work-conserving scheduling and preventing link resources from going unused.

What are some alternative scheduling algorithms to round-robin scheduling in network packet radio networks?

Some alternative scheduling algorithms to round-robin scheduling in network packet radio networks include deficit round-robin (DRR) scheduling, weighted round-robin (WRR) scheduling, and weighted fair queuing (WFQ), which may be considered when guaranteed or differentiated quality of service is offered.

What is the relationship between round-robin scheduling and multilevel queues?

<p>Round-robin scheduling is one of the very basic algorithms for operating systems and can be implemented through a circular queue data structure. It is also used in multilevel queues scheduling, where different processes are assigned to different priority levels and each level is scheduled using round-robin scheduling.</p> Signup and view all the answers

Explain the concept of round-robin scheduling and its advantages in process scheduling.

<p>Round-robin scheduling is an algorithm used by process and network schedulers in computing. It assigns time slices to each process in equal portions and in circular order, without priority. This ensures fairness and prevents starvation. Round-robin scheduling can also be applied to other scheduling problems, such as data packet scheduling in computer networks. Its advantages include simplicity, ease of implementation, and starvation-free execution.</p> Signup and view all the answers

How does a round-robin scheduler handle processes that do not complete within their time quantum?

<p>A round-robin scheduler interrupts a process if it is not completed within its assigned time quantum (also known as time slot). The job is then resumed next time a time slot is assigned to that process. If the process terminates or changes its state to waiting during its attributed time quantum, the scheduler selects the first process in the ready queue to execute.</p> Signup and view all the answers

Is the round-robin algorithm pre-emptive? Explain with an example.

<p>Yes, the round-robin algorithm is pre-emptive. If a process exceeds its time quantum, the scheduler forces the process out of the CPU and gives other processes their turn. For example, if the time slot is 100 milliseconds and job1 takes a total time of 250 ms to complete, the round-robin scheduler will suspend job1 after 100 ms and give other jobs their time on the CPU. Once the other jobs have had their equal share (100 ms each), job1 will get another allocation of CPU time and the cycle will repeat.</p> Signup and view all the answers

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Study Notes

Round-Robin Scheduling

  • Purpose: to allocate CPU time to multiple processes in a fair manner, ensuring each process gets an equal share of resources

How Round-Robin Scheduling Works

  • Each process is given a fixed time slice, called a time quantum
  • Processes are executed in a circular order, with each process getting a chance to execute for a time quantum
  • After the time quantum, the process is interrupted and the next process in the queue is executed

Round-Robin Scheduling in Network Packet Switching

  • Used in network packet switching to allocate bandwidth to multiple devices
  • Each device gets a fixed time slice to transmit packets, ensuring fair bandwidth allocation

Alternative Scheduling Algorithms

  • Priority Scheduling: prioritizes processes based on their priority
  • First-Come-First-Served (FCFS) Scheduling: executes processes in the order they arrive
  • Shortest Job First (SJF) Scheduling: executes the shortest process first

Relationship with Multilevel Queues

  • Multilevel queues use round-robin scheduling to allocate CPU time to multiple queues
  • Each queue has its own time quantum, and queues are serviced in a round-robin manner

Advantages of Round-Robin Scheduling

  • Provides fairness and equality among processes
  • Prevents starvation, where a process is denied access to the CPU for an extended period
  • Easy to implement and manage

Handling Processes that Exceed Time Quantum

  • If a process does not complete within its time quantum, it is interrupted and resumed from where it left off
  • The process is added back to the end of the queue, and the next process in the queue is executed

Pre-emptive Nature of Round-Robin Scheduling

  • Yes, round-robin scheduling is a pre-emptive algorithm, as it interrupts a process when its time quantum expires
  • Example: a process is executing, but its time quantum expires; the scheduler interrupts the process and schedules the next process in the queue

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