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 ?

Write the steps to use the network setup wizard, Question 1 Elaborate the ...

Question 1 Elaborate the various steps in performing a Mail Merge. Execute one mail merge operation for sending invitation for a conference which is being conducted in your organi

Explain different types of attacks, Question 1 Explain synchronous and asy...

Question 1 Explain synchronous and asynchronous Data Replication Question 2 Write a short note on Access Time, Latency, Transfer Time, and Streaming Tape Question 3

Programs, creating programs in scheme

creating programs in scheme

Object oriented programming, Write a method called Grade that takes a numer...

Write a method called Grade that takes a numeric score and returns a letter grade. Use the rule that 90 to100 is an A, 80 to 89 a B, 60 to 79 is a C, 45 to 59 is a D, and less th

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

What do you mean by the term "robotics", Question 1 What do you mean by se...

Question 1 What do you mean by semantic networks? Explain inheritance in semantic networks Question 2 Explain Partitioned semantic networks with an example Question

What is the intent of the singleton pattern, QUESTION Consider a Univer...

QUESTION Consider a University system which has several sub systems: Student Registration Module Registration Time Tabling Library System Human Resource Manag

Jsp project, how to save a Vector theList to a .txt file and read that .t...

how to save a Vector theList to a .txt file and read that .txt file to a jsp page /??

Concept of operating system, Concept of operating system: An operating...

Concept of operating system: An operating system is an essential software component of a computer system. The basic  objectives of an operating system are to make the computer

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