Fcfs scheduling algorithm, Operating System

Assignment Help:

Q. Presume that the following processes arrive for execution at the times indicated. Every process will run the listed amount of time. In responding the questions use non pre-emptive scheduling and base all decisions on the information you have at the time the decision must be made.

780_FCFS scheduling algorithm.png

a. What is the average revolve time for these processes with the FCFS scheduling algorithm?

b. What is the average revolve time for these processes with the SJF scheduling algorithm?

c. The SJF algorithm is supposed to improve performance however notice that we chose to run process P1 at time 0 because we did not know that two shorter processes would arrive soon. Calculate what the average turnaround time will be if the CPU is left idle for the first unit and then SJF scheduling is used. Keep in mind that processes P1 and P2 are waiting during this idle time thus their waiting time may increase. This algorithm could be recognized as future-knowledge scheduling.

Answer:

a. 10.53

b. 9.53

c. 6.86

Keep in mind that turnaround time is finishing time minus arrival time so you have to subtract the arrival times to compute the turnaround times. FCFS is 11 if you overlook to subtract arrival time.


Related Discussions:- Fcfs scheduling algorithm

Major differences between capability lists and access lists, Q. What are th...

Q. What are the major differences between capability lists and access lists? Answer: An access list is a list for each object consisting of the domains with a nonempty set of

Define loader that executed when system is first turned on, Define a loader...

Define a loader that is executed when a system is first turned on or restarted? Bootstrap loader is executed when a system is first turned on or restarted

How resolution of externally defined symbols is performed, Resolution of ex...

Resolution of externally defined symbols is carried out by    Resolution of externally defined symbols is carried out by Linker

What is the purpose of system calls, What is the purpose of system calls? ...

What is the purpose of system calls? System calls permit user-level processes to request services of the operating system.

Explain the types of system calls, Explain the Types of System Calls Th...

Explain the Types of System Calls The major types of system calls are like this: a. Process Control: These types of system calls are employed to control the processes.

What are the various page replacement algorithms, What are the various page...

What are the various page replacement algorithms used for page replacement? FIFO page replacement Optimal page replacement LRU page replacement LRU approximat

Is it essential to bind a real-time thread to an lwp, Q. Presume an operati...

Q. Presume an operating system maps user-level threads to the kernel using the many-to-many model and the mapping is done through LWPs. Additionally the system allows developers to

Define the properties of batch operating systems, Define the properties ope...

Define the properties operating systems: Batch :- Jobs with similar needs are batched together and  run through the computer as a group by an operator or automatic job sequenc

Computer organisation, basic advantage of using interrupt initiated data tr...

basic advantage of using interrupt initiated data transfer over transfer under program control without an interrupt

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