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?

operator, what is operator and operator associativel

what is operator and operator associatively

Define CISC and RISC ?, Two competing architectures were developed for impr...

Two competing architectures were developed for improving the architecture of the central processing unit, and different processors are conventional to each one. Both had their powe

Explain the process of fetching a word from the memory, Question 1 Explain...

Question 1 Explain the functional units of a basic computer with a neat diagram Question 2 Explain how you can get 1's complement of a given binary number? Also explain 1'

Memory unit of computer, Memory unit of computer: The Memory  unit is ...

Memory unit of computer: The Memory  unit is an important component of a computer where all the data and information are stored in the form  of binary digits (combination of 0

What do you mean by an interrupt, Question 1 . Explain briefly the function...

Question 1 . Explain briefly the functional units of a computer Question 2 . What do you mean by an interrupt Question 3 . Explain fetching a word from the memory

Explain ring counter with diagrams, Question 1 Convert the following hexad...

Question 1 Convert the following hexadecimal numbers to base 2 (D73)16 (A21)16 Question 2 Convert the following binary numbers to base 16 (11001011)2 (11

Communications programs , Communications Programs : By communications prog...

Communications Programs : By communications programs, we mean those programs which allow a computer to communicate via a transmission cable to another electronic device. Here we d

What is i-node number, Question 1 Bring out the advantages of Linux Ope...

Question 1 Bring out the advantages of Linux Operating systems Question 2 Match the Symbols with their respective file types              Symbol               File N

DBMS, what is the meaning of data definition

what is the meaning of data definition

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