Which scheduling algorithm allocates the CPU first to the process that requests the CPU first
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MohammedGuys, does anyone know the answer? get which scheduling algorithm allocates the cpu first to the process that requests the cpu first? from screen. This set of Operating System Multiple Choice Questions & Answers (MCQs) focuses on “CPU Scheduling”. 1. Which module gives control of the CPU to the process selected by the short-term scheduler? a) dispatcher b) interrupt c) scheduler d) none of the mentioned 2. The processes that are residing in main memory and are ready and ... Read more स्रोत : www.sanfoundry.com [Solved] Which scheduling algorithm allocates the CPU first to the process that requests the CPU first?स्रोत : mcqmate.com Which scheduling algorithm allocates the CPU first to the process that requests the CPU first?Which scheduling algorithm allocates the CPU first to the process that requests the CPU first? first-come, first-served scheduling shortest job scheduling priority scheduling none of the mentioned. Operating System Objective type Questions and Answers. स्रोत : compsciedu.com Do you want to see answer or more ? What is CPU Scheduling?CPU Scheduling is a process of determining which process will own CPU for execution while another process is on hold. The main task of CPU scheduling is to make sure that whenever the CPU remains idle, the OS at least select one of the processes available in the ready queue for execution. The selection process will be carried out by the CPU scheduler. It selects one of the processes in memory that are ready for execution. In this CPU scheduling tutorial, you will learn:
Types of CPU SchedulingHere are two kinds of Scheduling methods: Preemptive SchedulingIn Preemptive Scheduling, the tasks are mostly assigned with their priorities. Sometimes it is important to run a task with a higher priority before another lower priority task, even if the lower priority task is still running. The lower priority task holds for some time and resumes when the higher priority task finishes its execution. Non-Preemptive SchedulingIn this type of scheduling method, the CPU has been allocated to a specific process. The process that keeps the CPU busy will release the CPU either by switching context or terminating. It is the only method that can be used for various hardware platforms. That’s because it doesn’t need special hardware (for example, a timer) like preemptive scheduling. When scheduling is Preemptive or Non-Preemptive?To determine if scheduling is preemptive or non-preemptive, consider these four parameters:
Only conditions 1 and 4 apply, the scheduling is called non- preemptive. All other scheduling are preemptive. Important CPU scheduling Terminologies
CPU Scheduling CriteriaA CPU scheduling algorithm tries to maximize and minimize the following: Maximize:CPU utilization: CPU utilization is the main task in which the operating system needs to make sure that CPU remains as busy as possible. It can range from 0 to 100 percent. However, for the RTOS, it can be range from 40 percent for low-level and 90 percent for the high-level system. Throughput: The number of processes that finish their execution per unit time is known Throughput. So, when the CPU is busy executing the process, at that time, work is being done, and the work completed per unit time is called Throughput. Minimize:Waiting time: Waiting time is an amount that specific process needs to wait in the ready queue. Response time: It is an amount to time in which the request was submitted until the first response is produced. Turnaround Time: Turnaround time is an amount of time to execute a specific process. It is the calculation of the total time spent waiting to get into the memory, waiting in the queue and, executing on the CPU. The period between the time of process submission to the completion time is the turnaround time. Interval TimerTimer interruption is a method that is closely related to preemption. When a certain process gets the CPU allocation, a timer may be set to a specified interval. Both timer interruption and preemption force a process to return the CPU before its CPU burst is complete. Most of the multi-programmed operating system uses some form of a timer to prevent a process from tying up the system forever. What is Dispatcher?It is a module that provides control of the CPU to the process. The Dispatcher should be fast so that it can run on every context switch. Dispatch latency is the amount of time needed by the CPU scheduler to stop one process and start another. Functions performed by Dispatcher:
Types of CPU scheduling AlgorithmThere are mainly six types of process scheduling algorithms
First Come First ServeFirst Come First Serve is the full form of FCFS. It is the easiest and most simple CPU scheduling algorithm. In this type of algorithm, the process which requests the CPU gets the CPU allocation first. This scheduling method can be managed with a FIFO queue. As the process enters the ready queue, its PCB (Process Control Block) is linked with the tail of the queue. So, when CPU becomes free, it should be assigned to the process at the beginning of the queue. Characteristics of FCFS method:
Shortest Remaining TimeThe full form of SRT is Shortest remaining time. It is also known as SJF preemptive scheduling. In this method, the process will be allocated to the task, which is closest to its completion. This method prevents a newer ready state process from holding the completion of an older process. Characteristics of SRT scheduling method:
Priority Based SchedulingPriority scheduling is a method of scheduling processes based on priority. In this method, the scheduler selects the tasks to work as per the priority. Priority scheduling also helps OS to involve priority assignments. The processes with higher priority should be carried out first, whereas jobs with equal priorities are carried out on a round-robin or FCFS basis. Priority can be decided based on memory requirements, time requirements, etc. Round-Robin SchedulingRound robin is the oldest, simplest scheduling algorithm. The name of this algorithm comes from the round-robin principle, where each person gets an equal share of something in turn. It is mostly used for scheduling algorithms in multitasking. This algorithm method helps for starvation free execution of processes. Characteristics of Round-Robin Scheduling
Shortest Job FirstSJF is a full form of (Shortest job first) is a scheduling algorithm in which the process with the shortest execution time should be selected for execution next. This scheduling method can be preemptive or non-preemptive. It significantly reduces the average waiting time for other processes awaiting execution. Characteristics of SJF Scheduling
Multiple-Level Queues SchedulingThis algorithm separates the ready queue into various separate queues. In this method, processes are assigned to a queue based on a specific property of the process, like the process priority, size of the memory, etc. However, this is not an independent scheduling OS algorithm as it needs to use other types of algorithms in order to schedule the jobs. Characteristic of Multiple-Level Queues Scheduling:
The Purpose of a Scheduling algorithmHere are the reasons for using a scheduling algorithm:
Summary:
What scheduling algorithm assigns the CPU to the process with the highest priority?In Priority Preemptive Scheduling, the tasks are mostly assigned with their priorities. In Priority Non-preemptive scheduling method, the CPU has been allocated to a specific process. Processes are executed on the basis of priority so high priority does not need to wait for long which saves time.
What are CPU scheduling algorithms?CPU Scheduling is a process that allows one process to use the CPU while another process is delayed (in standby) due to unavailability of any resources such as I / O etc, thus making full use of the CPU. The purpose of CPU Scheduling is to make the system more efficient, faster, and fairer.
What is FIFO algorithm in CPU scheduling?First in, first out (FIFO), also known as first come, first served (FCFS), is the simplest scheduling algorithm. FIFO simply queues processes in the order that they arrive in the ready queue.
What is round robin scheduling in CPU?Round Robin is a CPU scheduling algorithm where each process is assigned a fixed time slot in a cyclic way. It is basically the preemptive version of First come First Serve CPU Scheduling algorithm. Round Robin CPU Algorithm generally focuses on Time Sharing technique.
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