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?

Memory management, Memory Management: The purpose of the memory mana...

Memory Management: The purpose of the memory management system is to load programs into memory in such a way as to give each program loaded  the memory that it requires for

Z80 CPU STATUS FLAGS, function of each status flags Z80 status flags

function of each status flags Z80 status flags

Arrays and strings, This is a C file. 1. The program starts by printing you...

This is a C file. 1. The program starts by printing your name with an end sign ">". For example, "NAME >"; 2. Then, you can type in a string. If the string is not "vi xxx", you pri

Adding macros to ms word 2010 for a particular format, Project Setting up ...

Project Setting up Microsoft Word 2010 to automatically handle as much as possible of the NDSU Graduate School requirements for a disquisition. Accessible from the Graduate Schoo

Protocol, what protocol is used by DNS name server

what protocol is used by DNS name server

What is mixing, Question 1 Briefly explain waveform Characteristics ...

Question 1 Briefly explain waveform Characteristics Question 2 Write a note on: types of Microphones Question 3 Briefly explain Magnetic Properties of Audiotape

Software engineering, how will a poorly conducted feasibility study affect ...

how will a poorly conducted feasibility study affect an implemented system

Basic description of a computer system, The main components of a computer ...

The main components of a computer system at a basic level Computer System We call computer system to the whole configuration of a computer, as well as the peripheral units and the

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