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 ?

Describe symbols chart in assembly process ?, SYMBOLS CHART Every one of t...

SYMBOLS CHART Every one of the parts on code line in assembler is known as token, for instance on the code line: MOV AX, Var We comprise three tokens, the MOV instruction, the AX o

Need of artificial intelligence, Need of artificial intelligence: Artif...

Need of artificial intelligence: Artificial Intelligence may be seen as just the latest tool in the philosopher's toolbox for answering these all questions about the behavior o

Introduction to laboratory organisation and management, INTRODUCTION : In ...

INTRODUCTION : In the earlier units of this block you learnt the importance of proper filing and record keeping. You are also aware that in laboratory organisation and management,

Assembly language, write and run the following programs using 8086 assembly...

write and run the following programs using 8086 assembly language that interchange the upper and lower four bits of AL register.

Digital design system, Manipulate the following Boolean expression in such ...

Manipulate the following Boolean expression in such a way so that it can be implemented using exclusive-OR and AND gates only. AB''CD'' + A ''BCD'' + AB''C''D + A''BC''D

Define Twisted Pair Cables , Twisted pair cables comes in two appearance :...

Twisted pair cables comes in two appearance : Unshielded twisted pair cable : UTP : UTP cables is the most common types of telecommunication medium used today. Its frequency range

What are the most common forms of mixing, Question 1 What is the differenc...

Question 1 What is the difference between Variable Bit Rate and Constant Bit Rate? Question 2 Write a note on: Normalization, Reverberation, Noise Reduction, Filters, and

Briefly explain the stage and the timeline, Question 1 Briefly explain the...

Question 1 Briefly explain the Stage and the Timeline Question 2 What is Device Central? How it is useful for previewing mobile content? Question 3 Which are the f

operator, what is operator and operator associativel

what is operator and operator associatively

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