explain CPU scheduling and its objectives?, Basic Computer Science

Assignment Help:
Definition of CPU scheduling:
The assignment of physical processors to processes allows processors to complete work. The process of determining that for which process which processor should be assign this process is called processor scheduling or CPU scheduling.
When one or more than one process is run able, the operating system must choose which one first. The division of the operating system concerned with this decision is called the scheduler, and algorithm it uses is called the scheduling algorithm.

Objectives of scheduling (objectives)
Many objectives must be regarded as in the design of a scheduling discipline. In exacting, a scheduler should consider fairness, efficiency, reaction time, turnaround time, throughput, etc., Some of these objectives depends on the system one is using for instance batch system, cooperative system or real-time system, etc. but there are also some objectives that are desirable in all systems.

General objectives
• Fairness is vital under all circumstances. A scheduler makes sure that each process gets its fair share of the CPU and no process can undergo indefinite postponement. Note that giving equivalent or equivalent time is not fair. Think of security control and payroll at a nuclear plant.
• The scheduler has to assure that system''s policy is enforced. For instance, if the local policy is safety then the safety control processes must be talented to run whenever they want to, even if it means delay in payroll processes.

• Scheduler should remain the system (or in exacting CPU) demanding cent percent of the time when possible. If the CPU and all the Input / Output devices can be kept running all the time, more work obtains done per second than if some components are idle.
• A scheduler should reduce the time batch users must remain for an output.
• A scheduler should exploit the number of jobs processed per component time.
• A scheduler should reduce the response time for interactive user.


A little thought will show that some of these objectives are opposing. It can be shown that any scheduling algorithm that supports some class of jobs hurts another class of jobs.


Related Discussions:- explain CPU scheduling and its objectives?

Variable - concept of programming language, Variable - Concept of programmi...

Variable - Concept of programming language: Variable: As referencing memory by its physical address is very tedious, variable names are used. A variable is a symbolic name giv

Differentiate the client–server and peer-to-peer models of d, The client-se...

The client-server model firmly differentiates the roles of the client and server. According to this model, the client requests services that are provided by the server. The peer-to

Printer output, Printer output : Consider what is required here. ...

Printer output : Consider what is required here. Do you just require management information on the one hand or camera copy for reprographic purposes? Inkjet Very quiet. C

Arinc 429 data bus specifications, ARINC 429 DATA Bus SPECIFICATIONS: A...

ARINC 429 DATA Bus SPECIFICATIONS: ARINC 429 sets specifications for the transfer of digital data between aircraft electronic system components and is a "One-way" communication

Time sharing, Time Sharing Time sharing allows a large number of users ...

Time Sharing Time sharing allows a large number of users at various remote terminals to simultaneously use a centrally located computer for problem solving. Each user operates

What is the importance of using digital certificates, QUESTION a) Crypt...

QUESTION a) Cryptography is a set of techniques and mathematical algorithms. Describe four important areas where cryptography must be applied b) What is the importance of us

Give a preliminary design for the mobile phone, Question: Imagine that ...

Question: Imagine that you are part of a design team creating a new mobile phone for people such as "Angel White" whose persona is given below: Angel is turning 90 years old

Need of artificial intelligence, Need of artificial intelligence: Artif...

Need of artificial intelligence: Artificial Intelligence may be seen as just the latest tool in the philosopher's toolbox for answering these all questions about the behavior o

Machine Learning, Hi I have a 8 question machine learning problem sheet due...

Hi I have a 8 question machine learning problem sheet due to the 25th of december. The exercises require knowledge of basic classifiers, logistic regression, naive bayes, mixture o

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd