{"id":1129,"date":"2024-04-10T06:59:24","date_gmt":"2024-04-10T06:59:24","guid":{"rendered":"https:\/\/learnlearn.uk\/ibcs\/?page_id=1129"},"modified":"2024-04-10T06:59:24","modified_gmt":"2024-04-10T06:59:24","slug":"round-robin-scheduling","status":"publish","type":"page","link":"https:\/\/learnlearn.uk\/ibcs\/round-robin-scheduling\/","title":{"rendered":"Round Robin Scheduling"},"content":{"rendered":"
\n

Introduction<\/h2>\n
\n\n

Round Robin Scheduling<\/h3>\n

\"\"<\/p>\n

Round Robin scheduling is a preemptive algorithm where each process is assigned a fixed time slice or quantum, and the CPU scheduler rotates among the processes, allowing each to execute for a predefined time interval.<\/p>\n

If a process doesn’t complete within its time slice, it’s preempted, and the scheduler moves to the next process in the queue.<\/p>\n

It’s designed to allocate CPU time fairly to all processes in the system, regardless of their arrival time or execution characteristics.<\/p>\n\n<\/div>

Initialisation<\/h2>\n
\n\n

Initialisation & Time Slicing<\/h3>\n

Initially, all processes in the system are placed in a ready queue.<\/p>\n

Each process in the ready queue is assigned a fixed time quantum (also known as a time slice). This time quantum is the maximum amount of CPU time that a process can have before it’s preempted to allow another process to execute.<\/p>\n\n<\/div>

Execution<\/h2>\n
\n\n

Execution & Preemption<\/h3>\n

The scheduler selects the process at the front of the ready queue and allocates it the CPU for its time quantum.<\/p>\n

If the process completes its CPU time quantum before finishing, it’s preempted by the scheduler, and it’s placed at the end of the ready queue.<\/p>\n\n<\/div>

Queue Rotation <\/h2>\n
\n\n

Queue Rotation & Loop Back<\/h3>\n

The scheduler moves to the next process in the ready queue and repeats the process.<\/p>\n

This rotation continues until all processes have had a chance to execute or until a certain condition is met (such as all processes being completed or a specified time limit elapsing).<\/p>\n

After each process has had its turn to execute, the scheduler loops back to the beginning of the ready queue, treating it as a circular queue.<\/p>\n\n<\/div>

Pros and Cons<\/h2>\n
\n\n

Advantages of Round Robin Scheduling<\/h3>\n

Fairness<\/strong>
\nRound Robin ensures equal CPU time allocation among processes, promoting fairness in resource utilization.<\/p>\n

Responsiveness<\/strong>
\nProvides quick response times for short tasks due to regular time slices.<\/p>\n

Simplicity<\/strong>
\nRelatively easy to implement compared to other algorithms, involving a straightforward round-robin queue.<\/p>\n

Predictability<\/strong>
\nOffers predictable behavior, ensuring each process receives CPU time within its allotted slice.<\/p>\n

\nDisadvantages of Round Robin Scheduling<\/h3>\n

Overhead<\/strong><\/p>\n

Frequent context switches can introduce overhead, especially with smaller time slices.<\/p>\n

Inefficiency with Varied Tasks<\/strong><\/p>\n

Short tasks may suffer from repeated interruptions, impacting efficiency.<\/p>\n

Poor Long Task Performance<\/strong><\/p>\n

Long-running tasks may experience increased latency due to sharing CPU time.<\/p>\n

Time Quantum Sensitivity<\/strong><\/p>\n

Performance depends heavily on the chosen time slice, affecting responsiveness and efficiency.<\/p>\n\n<\/div>

Resources<\/h2>\n
\n\n

Resources<\/h3>\n

Online Revision Resources<\/a><\/p>\n

Teacher Presentation<\/a><\/p>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"

Round Robin Scheduling Round Robin scheduling is a preemptive algorithm where each process is assigned a fixed time slice or quantum, and the CPU scheduler rotates among the processes, allowing each to execute for a predefined time interval. If a process doesn’t complete within its time slice, it’s preempted, and the scheduler moves to the… Read More »Round Robin Scheduling<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"off","neve_meta_content_width":100,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":""},"yoast_head":"\nRound Robin Scheduling - IB Computer Science<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/learnlearn.uk\/ibcs\/round-robin-scheduling\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Round Robin Scheduling - IB Computer Science\" \/>\n<meta property=\"og:description\" content=\"Round Robin Scheduling Round Robin scheduling is a preemptive algorithm where each process is assigned a fixed time slice or quantum, and the CPU scheduler rotates among the processes, allowing each to execute for a predefined time interval. 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