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FCFS = First Come First Serve SJF = Shortest Job First Round Robin = Skip from one job to the next giving each job an equal amount of processing time. (up to you or given)
In an example: You have 4 jobs ahead of you. JobC, JobA, JobB, JobD and they were handed in to you, in that order. JobA will take 2 hours to do, JobB will take 1 hour, JobC will take 5 hours, and JobD will take 9 hours. FCFS, basically would mean you finish JobC first, since it came to you first. Then when JobC was done, you would work on JobA and so on. SJF, you would finish JobB first, then JobA, then JobC and then JobD. Round Robin, you would work on JobC for 1 hour, then JobA for 1 hour, then JobB for 1 hour and then JobD for 1 hour, and repeat.
What else can I help you with?
What kind of data structure is required to implement the round robin scheduling policy?
The circular queue data structure is required to implement the round robin scheduling policy. Round robin is similar to FCFS scheduling.
What do you understand by queue Discipline?
IN QUEueing theory,it is like how we serve people in waiting line --- 1.fcfs 2.round robin 3.sjf 4. siro 5.fifo
What is queue discipline?
Queue discipline refers to the rules or policies that determine the order in which entities (such as customers, data packets, or tasks) are served in a queue. Common types of queue disciplines include First-Come, First-Served (FCFS), Last-Come, First-Served (LCFS), priority-based servicing, and round-robin. The choice of queue discipline can significantly impact the efficiency, fairness, and performance of a system, influencing wait times and resource utilization.
Briefly define FCFS scheduling?
FCFS is "First come, first served" Scheduling: Processes are given time on the CPU in the order that they arrive. eg: Process | Arrival Time (ns) | Burst Time (ns) P1 0 20 P2 0 10 P3 0 5 Scheduling Diagram for FCFS: | P1 | P2 | P3 | 0ns 20ns 30ns 35ns
What would be the effect using the FCFS scheme if the running process got stuck in an infinite CPU loop?
In FCFS the processes are in served by the order they arrive and each process will not start until the served process is finished, so if any of the processes got stuck in an infinite CPU loop the whole system will stop and hang.
Explain with an example first come first serve scheduling algorithm?
By far the simplest CPU-scheduling algorithm is the first-come, first-served (FCFS) scheduling algorithm. With this scheme, the process that requests the CPU first is allocated the CPU first. The implementation of the FCFS policy is easily managed with a FIFO queue. When a process enters the ready queue, its PCB is linked onto the tail of the queue. When the CPU is free, it is allocated to the process at the head of the queue. The running process is then removed from the queue. The code for FCFS scheduling is simple to write and understand. The average waiting time under the FCFS policy, however, is often quite long. Consider the following set of processes that arrive at time 0, with the length of the CPU-burst time given in milliseconds:
How many types of scheduling?
There are several types of scheduling used in various fields, but the most common include: First-Come, First-Served (FCFS): Processes are scheduled in the order they arrive. Round Robin (RR): Each process is assigned a fixed time slice in a cyclic order. Priority Scheduling: Processes are scheduled based on priority levels, with higher priority tasks executed first. Shortest Job Next (SJN): The process with the shortest execution time is scheduled next. Each type has its own advantages and is suited for different scenarios.
What is scheduling strategy?
A scheduling strategy refers to the method or approach used to allocate resources, tasks, or jobs over time to optimize performance and efficiency. It involves determining the order and timing of tasks to ensure that deadlines are met, resources are utilized effectively, and overall productivity is maximized. Common scheduling strategies include First-Come, First-Served (FCFS), Shortest Job Next (SJN), and Round Robin, each suited for different scenarios and objectives. The choice of strategy can significantly impact workflow, resource allocation, and overall system performance.
What are the disadvantages of FCFS scheduling?
in fcfs scheduling there is a shortcoming that is if any rocess of maximum brust time is first ome. and after that many short burst time process come. then smaller pocesses have to wait for a long time untill the max brust time process complete their execution. in case of shortest job first it applied the method to give shortest t\burst time job to processer first.
What is the disadvantages of using round-robin scheduling?
Disadvantage:§ Very important jobs wait in line.§ Largest job take enough time for completion.§ Setting the quantum too short causes too many context switches and lower the CPU efficiency.§ Setting the quantum too long may cause poor response time and approximates FCFS.
What properties of processes determine which process should CPU used next?
The properties of processes that determine which one should be allocated CPU time next include priority, burst time (the amount of time a process needs on the CPU), and waiting time. Scheduling algorithms, such as First-Come-First-Served (FCFS), Shortest Job First (SJF), or Round Robin, utilize these properties to optimize CPU utilization and responsiveness. Additionally, factors like process state (ready, waiting) and resource requirements can influence scheduling decisions. Ultimately, the goal is to maximize efficiency while ensuring fairness among processes.
Which os is used in FCFS?
FCFS, or First-Come, First-Served, is a scheduling algorithm commonly used in various operating systems, including Unix, Linux, and Windows. It is a simple, non-preemptive scheduling method where processes are executed in the order they arrive in the ready queue. While it is not the most efficient for time-sharing systems due to potential long wait times, it is easy to implement and can be found in many basic operating systems and environments.
