define Shortest-Job-First (SJF) Scheduling ?, Basic Computer Science

Assignment Help:

• It is also known as Shortest-Process-Next (SPN).
• Shortest-Job-First (SJF) is a non-preemptive order in which waiting job (or process) with the smallest predictable run-time-to-completion is run next. In other language, when CPU is available, it is allotted to the process that has smallest next CPU burst.
• The SJF scheduling is mainly suitable for batch jobs for which the run times are known in advance. Since the SJF scheduling algorithm gives the minimum average time for a given set of processes, it is almost certainly optimal.
• The SJF algorithm helps short jobs (or processors) at the cost of longer ones.
• The understandable problem with SJF scheme is that it requires precise acquaintance of how long a job or process will run, and this information is not generally available.
• In the production environment where the same jobs run frequently, it may be possible to provide reasonable estimate of run time, based on the past presentation of the process. But in the development environment users not often know how their program will execute.
• The best SJF algorithm can do is to rely on user approximation of run times.
• Like FCFS, SJF is non preemptive therefore, it is not helpful in timesharing environment in which reasonable answer time must be sure.

Related Discussions:- define Shortest-Job-First (SJF) Scheduling ?

Algorithms and flowcharts, 1. Write an algorithm and draw a flowchart to ac...

1. Write an algorithm and draw a flowchart to accept the names and gross salary of 5000 employees and to generate the net pay. If the gross salary is greater than N 50,000 declare

Choice of medium - transmission channels, Choice of Medium: All the tr...

Choice of Medium: All the transmission channels discussed in the foregoing paragraphs can be used as point to point connections or as broadcast systems. Transmitting informati

Accessing folders and printers, Accessing Folders and Printers Accessi...

Accessing Folders and Printers Accessing folders, files and printers of another computer is as easy as accessing another computer. To access folders and printers of another c

Arrays, Write an application that stores at least five different department...

Write an application that stores at least five different department and supervisor names in a two-dimensional array. Allow the user to enter a department name (such as “Marketing”)

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

design railway maintenance system. draw er diagram.

Computer, hitory and genration of computer

hitory and genration of computer

What is the delay of the filter, QUESTION We wish to use the Kaiser win...

QUESTION We wish to use the Kaiser window method to design a discrete-time filter with generalized linear phase that meets specifications of the following form:

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

Write a program to swap two names between two variables, QUESTION (a) W...

QUESTION (a) Write a program to swap two names between two variables for examples: N1 = "Mary Anne" N2 = "Queen Mary". The program should make use of an appropriate Fu

Decision table , No charges are reimbursed to the patient until the deducti...

No charges are reimbursed to the patient until the deductible has been met. Hospital visits are reimbursed at 80% and Lab visits are reimbursed at 70%. Doctor''s office visits are

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