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?

CAI, WHAT IS CAI ITS PITFALLS

WHAT IS CAI ITS PITFALLS

Mainframe architecture, Mainframe Architecture: Till a few decades bac...

Mainframe Architecture: Till a few decades back, all computing was controlled through the central mainframes server. Multiple users could connect to the central host through u

Assignment, Hi I have an assignment can you help me ?

Hi I have an assignment can you help me ?

What are the commonly used input/output functions in c, Problem 1 What ...

Problem 1 What is the significance of the keyword 'extern' in a function declaration? Explanation of significance of Keyword 'extern' in function declaration Probl

Cryptography, Assume |s1|=|s2|=n and consider the functions defined, for an...

Assume |s1|=|s2|=n and consider the functions defined, for any s1 and s2, as: (a) G1(s1,s2)=s1 xor s2, (b) G2(s1,s2)=(s1, s2, s1 xor s2). We have that: A. G1 and G2 are pseudo-ra

Wap and wml, what is charactersics of mobile computing

what is charactersics of mobile computing

Breadth first search - artificial intelligence, Breadth First Search - arti...

Breadth First Search - artificial intelligence: Given a set of operators o1, ..., on in a breadth primary search, every time a new state s is reached, an action for every  oper

Transmission control protocol, The TCP/IP networking protocol suite is so b...

The TCP/IP networking protocol suite is so basically named for two of its very most and important protocols: Transmission Control Protocol online tutoring Indication Manage

Types of operating systems, Operating Systems:  An operating system is a se...

Operating Systems:  An operating system is a set of programs that manage computer hardware resources and provide common services for application software.  There are following kind

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