CPU Scheduling Criteria:
There are many scheduling algorithms and various criteria to judge their performance. Different algorithms may favor different types of processes. Some criteria are. as follows:
• CPU utilization: CPU must be as busy as possible in performing different tasks. CPU utilization is more important in real-time system and multi-programmed systems.
• Throughput: The number of processes executed in a specified time period is called throughput. The throughput increases .for short processes. It decreases if the size of processes is huge.
• Turnaround Time: The amount of time that is needed to execute a process is called turnaround time. It is the actual job time plus the waiting time.
• Waiting Time: The amount of time the process has waited is called waiting time. It is the turnaround time minus actual job time.
• Response Time: The amount of time between a request is Submitted and the first response is produced is called response time.
A CPU scheduling algorithm should try to maximize the following:
• CPU utilization
• Throughput
A CPU scheduling algorithm should try to minimize the following:
• Turnaround time
• Waiting time
• Response time
by manish kumar gnit g.noida
The Cpu Temperature is The Maximum/Minimum temperature of Cpu, You have to be inside these limits for your Cpu Safety
The circular queue data structure is required to implement the round robin scheduling policy. Round robin is similar to FCFS scheduling.
CPU stands for central processing unit. As the name implies, the CPU processes everything the computer does and handles everything that goes on in a computer. The CPU is often referred to as the brain of the computer since everything goes through the CPU first. The purpose of the CPU is to read machine language and do what it is told by it. The machine code are the directions on what the CPU should do, but the CPU is needed in order to read this code.
dynamic job shop scheduling is the scheduling of the machine it can processes different jobs at time. it switches from one job to another job. in real time process jobs are executed based on the time.
The CPU IS the computers processing unit as CPU stands for "Central Processing Unit"
The CPU scheduler is the part of the Operating System that determines when to allow each thread to execute. Usually this is done by seeing if all the wait conditions, such as IO wait, timer wait, semaphore wait, etc. have been cleared, and if the thread priority or round-robin turn criteria have been met.
The priority scheduling algorithm is a kind of CPU scheduling algorithm where the processes that wait for the CPU are scheduled according to their priority..
So that CPU utilise all the resources of OS
1.) in preemptive scheduling we prempt the currently executing process, in non preemptive scheduling we allow the current process to finish its CPU burst time... 2.) in preemptive scheduling the process is forcibly sent to waiting state when a process with higher priority comes to CPU, in non preeemptive scheduling the process at running state can not be forced to leave the CPU until it completes........
same as linux use.
Preemptive scheduling allows a process to be interrupted in the midst of its execution, taking the CPU away and allocating it to another process.Non-preemptive scheduling ensures that a process relinquishes control of the CPU only when it finishes with its current CPU burst.
In Non-Primitive CPU Algo. once a process is given to the CPU it cannot be preempt,but in primitive Algo. it can be.
the objective of multiprograming is to have some processs running at aal time,so as to maximizing cpu utillization .this process is called scheduling.
Basically,this is a need in case of multiprogramming.For optimum utilization of CPU it should be utilised in the meanwhile time when some process is in waiting state for some I/O or waiting for some event to occur. So,for this many programs should be in memory in waiting state so that CPU can be allocated to some other process for optimum utilization of CPU. A schedule(time table in broad sense) which will decide Cpu will be allocated to which process when some previous process is in waiting state. Now this schedule is designed according to some criteria(algorithm) to decide CPU will be allocated to which process. Some Algorithms: 1.First Come First Serve(FCFS) 2.Shortest Job Scheduling(SJS) 3.RoundRobin Scheduling(RRS)
Yes, it is one of many scheduling algorithms suitable for time sharing.However it is not suitable for scheduling in a hard realtime OS that must consistently meet deadlines.
Round robin schedulingPriority schedulingShortest job firstBy Tirok
1. Job scheduler is also called long term scheduler and CPU scheduler is called short term scheduler.2. Job scheduler selects the processes from the job pool and load them in to the memory for execution. in other hand CPU scheduler selects among the processes that are in ready to execute and allocate the CPU to one of them.3. CPU scheduler is faster than the process scheduler.Read more: What_is_the_difference_between_the_job_scheduler_the_CPU_scheduler