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

What is a dispatcher, What is a Dispatcher? The dispatcher is the modul...

What is a Dispatcher? The dispatcher is the module that gives control of the CPU to the process selected by the short- term scheduler. This function includes: Switching

What is the occupation of the object manager, Q. What is the occupation of ...

Q. What is the occupation of the object manager? Answer: Substance present a generic set of kernel mode interfaces to user mode programs. Objects are influenced by the execut

Protection, protection in operating system

protection in operating system

Explain the various methods for handling deadlocks, Explain the various met...

Explain the various methods for handling deadlocks.      A set of processes is deadlocked if every process in the set is waiting for an event that only a process in the

Operating System, my Operating System is windows trust but when the windows...

my Operating System is windows trust but when the windows start say its windows xp. help pleaes

Mention some attractive properties of semaphore?, Mention some attractive p...

Mention some attractive properties of semaphore?              The Semaphores aren't provided by hardware. However they have numerous attractive properties: Machine indep

Shared stack is used for parameter passing, Q. What protection problems may...

Q. What protection problems may occur if a shared stack is used for parameter passing? Answer: The contents of the stack could be conciliation by other process(es) sharing th

How does a program execution take place in multiprogramming?, How does a pr...

How does a program execution take place in multiprogramming? While the processor is dealing with a number of programs, the sequence with which programs are implemented will de

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