Describe Priority Scheduling algorithm of operating system?, Basic Computer Science

Assignment Help:
Priority Scheduling

• The fundamental idea is straightforward: each process is assigned a priority, and priority is permitted to run. Equal-Priority processes are scheduled in FCFS order. The shortest-Job-First (SJF) algorithm is a special case of general priority scheduling algorithm.
• Priority can be defined either internally or outwardly. Internally distinct priorities use some measurable quantities or behaviors to compute priority of a process.
• An SJF algorithm is simply a priority algorithm where the priority is the inverse of the (predicted) next CPU burst. That is, the longer the CPU explodes, the lower the priority and vice versa.
Illustrations of Internal priorities are
• Deadlines.
• Memory necessities.
• CPU Vs I/O necessities.
• File necessities,
for example, number of open files.
Externally distinct priorities are set by criteria that are external to operating system for example:
• The significance of process.
• Kind or amount of funds being rewarded for computer use.
• The division sponsoring the work.
• A preemptive priority algorithm will preemptive the CPU if the priority of the newly arrival process is higher than the priority of the currently running process.
• This scheduling can be either preemptive or non preemptive
• A non-preemptive priority algorithm will simply put the new process at the head of the ready queue.
A major trouble with priority scheduling is indefinite blocking or starvation. A solution to the trouble of indefinite blockage of the low-priority process is aging. Aging is a method of gradually increasing the priority of processes that wait in the system for an extended period of time.

Related Discussions:- Describe Priority Scheduling algorithm of operating system?

Explain public code archive, Question 1 Explain the various tools used for...

Question 1 Explain the various tools used for open source software development Question 2 Discuss the OSS licensing strategies Question 3 Explain the software developmen

The terms ''row-major order'' and ''column-major order", What is meant by t...

What is meant by the terms 'row-major order' and 'column-major order'? Ans: (i) Storing the array column by column is called as column-major order and storing the array row by

Concept of programming language, CONCEPT OF PROGRAMMING LANGUAGE: In o...

CONCEPT OF PROGRAMMING LANGUAGE: In order to communicate with other human beings, one needs some language or a medium. In the same way for solving problems, a programming  lan

Information security, can someone balance between information security and ...

can someone balance between information security and access, if yes,how can they balance?

What is the structure of a global.asax file in asp.net, Question (a) De...

Question (a) Describe the following built-in functions and illustrate each using simple examples. Specify every possible parameters where required Replace() StrComp()

What are the three basic security provided by ssl, QUESTION (a) Can SSL...

QUESTION (a) Can SSL be used to encrypt email data? Justify your answer (b) What are the three basic security provided by SSL? (c) State the port number used by applicati

Introduction to laboratory organisation and management, INTRODUCTION : In ...

INTRODUCTION : In the earlier units of this block you learnt the importance of proper filing and record keeping. You are also aware that in laboratory organisation and management,

Visual Basic 2012, Can someone help me write a code for force = mass * acce...

Can someone help me write a code for force = mass * acceleration.

Define and explain flow chart with an example, Question 1 Define and expla...

Question 1 Define and explain flow chart with an example Question 2 Write an algorithm to print all even numbers in descending order and draw the flowchart Question 3 Explain

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