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?

Data structures hw help, Create an implementation of the Ordered Associativ...

Create an implementation of the Ordered Associative Array API using left-leaning red-black trees. Illustrate the use of the API by refactoring your WordBench as a client of Ordered

Definition of procedure, A procedure is a compilation of instructions to wh...

A procedure is a compilation of instructions to which we can express the flow of our program, and once the execution of these instructions is over power is given back to the next l

How to set up the location (e.g. plaza, how to set up the location (e.g. pl...

how to set up the location (e.g. plaza, hall of fame, lecture theater or etc.) and services that will be used during the exhibition; devices needed; and finally produced a compreh

Computer as a data processor, Computer as a Data Processor: The main f...

Computer as a Data Processor: The main function of a computer is to process the input data according to a specific program to produce the desired output. This is the reason wh

Satellite transmission, Satellite Transmission: Satellites use microwa...

Satellite Transmission: Satellites use microwave frequencies and techniques. Satellites used for message transmission (as opposed to those, which travel around the earth on st

Syntax of a Macro, The divisions which make a macro are: • Declaration of t...

The divisions which make a macro are: • Declaration of the macro Code of the macro Macro termination directive The assertion of the macro is done the following way: Name Macro [par

Microwave transmission, Microwave Transmission: Using space as transmi...

Microwave Transmission: Using space as transmission medium, microwave emanates from an origination point on earth, such as telephone exchange, where many individual messages h

Comments in Python, A hash sign (#) that is not within a string literal beg...

A hash sign (#) that is not within a string literal begins a comment. All characters later than the # and up to the physical line end are division of the comment, and the Python in

Hypertext markup language (html), HTML is a Formatting language which is mo...

HTML is a Formatting language which is most commonly used for web documents.

What are the various skills needed for broadcasting and film, Question 1 W...

Question 1 What are the various skills needed for broadcasting and film? Question 2 What is a 2 dimensional animations and 3 dimensional animations? Question 3 Different

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