Podcast
Questions and Answers
In First-Come, First-Served (FCFS) algorithm, the process that arrives first gets ______ first
In First-Come, First-Served (FCFS) algorithm, the process that arrives first gets ______ first
scheduled
FCFS stands for First-Come, ______
FCFS stands for First-Come, ______
First-Served
Shortest Job First (SJF) prioritizes the execution of jobs based on their expected ______
Shortest Job First (SJF) prioritizes the execution of jobs based on their expected ______
duration
SJF stands for Shortest Job ______
SJF stands for Shortest Job ______
Signup and view all the answers
Shortest Remaining Time First (SRTF) schedules a process when its turn comes up, even if there are other smaller jobs ______
Shortest Remaining Time First (SRTF) schedules a process when its turn comes up, even if there are other smaller jobs ______
Signup and view all the answers
In SRTF, you need to sort the list of jobs by their remaining time after every completion of a ______
In SRTF, you need to sort the list of jobs by their remaining time after every completion of a ______
Signup and view all the answers
The Shortest Remaining Time First algorithm only schedules a process when its ______ comes up
The Shortest Remaining Time First algorithm only schedules a process when its ______ comes up
Signup and view all the answers
Priority Scheduling prioritizes jobs based on their ______
Priority Scheduling prioritizes jobs based on their ______
Signup and view all the answers
In FCFS, if we have three processes A, B, and C arriving at time t=0, t=2, and t=6 respectively, they will be scheduled in the order of FCFS - A, B, and ______
In FCFS, if we have three processes A, B, and C arriving at time t=0, t=2, and t=6 respectively, they will be scheduled in the order of FCFS - A, B, and ______
Signup and view all the answers
If we have two jobs, one with a duration of 5 units and another with a duration of 8 units, the shorter job of 5 units will be scheduled first in the ______ algorithm
If we have two jobs, one with a duration of 5 units and another with a duration of 8 units, the shorter job of 5 units will be scheduled first in the ______ algorithm
Signup and view all the answers
Study Notes
CPU Scheduling Algorithms in Operating Systems
When it comes to managing and allocating processing power within an operating system, CPU scheduling is essential. It involves selecting processes from the ready queue and assigning them to available CPUs. Here's a look at some of the most common CPU scheduling algorithms used in operating systems:
First-Come, First-Served (FCFS)
The FCFS algorithm is one of the simplest CPU scheduling algorithms. In this method, the process that arrives first gets scheduled first, followed by the next process, and so on. For example, if we have three processes A, B, and C arriving at time t=0, t=2, and t=6 respectively, they will be scheduled in the order of FCFS - A, B, and C.
Shortest Job First (SJF)
Shortest Job First, also known as the Shortest Job Next algorithm, prioritizes the execution of jobs based on their expected duration. This means that the shortest job in the waiting line will be executed first. For instance, if we have two jobs, one with a duration of 5 units and another with a duration of 8 units, the shorter job of 5 units will be scheduled first.
Shortest Remaining Time First (SRTF)
Shortest Remaining Time First is similar to SJF except that it only schedules a process when its turn comes up, even if there are other smaller jobs ahead. To implement SRTF, you need to sort the list of jobs by their remaining time after every completion of a process. If a new process enters the system, it goes to the end of the sorted list.
Priority Scheduling
Priority scheduling is a complex algorithm where each process has an associated priority level. When multiple processes are ready to run, the one with the highest priority is selected. There are different ways to determine priorities such as priority being proportional to the size of the job, priority being constant, or priority changing dynamically as a function of the CPU usage. However, dynamic priority changes can lead to starvation, which is why static priority schemes are more commonly implemented.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Explore the key concepts of CPU scheduling algorithms used in operating systems, including First-Come, First-Served (FCFS), Shortest Job First (SJF), Shortest Remaining Time First (SRTF), and Priority Scheduling. Understand how processes are selected and managed to optimize CPU usage and task completion.
