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?

C, What is a Structure?

What is a Structure?

Backup software, Backup software: A number of Backup software are avai...

Backup software: A number of Backup software are available that assist you in taking backup of your important data on the computer. Selecting between various back-up software

What is atm cell, Header contains routing and error control information Pay...

Header contains routing and error control information Payload carries the actual user information, either voice, data or video

Accessing other computers, Accessing Other Computers The advanced netw...

Accessing Other Computers The advanced networking features of Windows combined with the easy to use user interface make the task of sharing information with other computers/us

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'

CAI, what is CAI? explain its pit falls.

what is CAI? explain its pit falls.

Database design, design railway maintenance system. draw er diagram.

design railway maintenance system. draw er diagram.

Write this ARM assemble language program, Programming Assignment CS252 Spri...

Programming Assignment CS252 Spring 2014 Write an ARM assembly language subroutine that performs according to the following specification (Caesar cypher). Given a mixed case al

Internet searching, Internet searching:  The Internet consists of mill...

Internet searching:  The Internet consists of millions of private/public/academic/business and government networks having local to global scope. It has billions of web pages o

Applications software, Applications Software: General aspects on appli...

Applications Software: General aspects on applications software. Applications software is the program that allow the user to get the required work done. In other words, applic

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