Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Q. The accelerating search for described in subsequent exercise is typical of hard-disk drives. By contrast floppy disks and several hard disks manufactured before the mid-1980s typically seek at a fixed rate. Presume that the disk in subsequent exercise has a constant-rate seek rather than a constant acceleration seek consequently seek time is of the form t = x + yL where t is the time in milliseconds and L is the seek distance. Presume that the time to seek to an adjacent cylinder is 1 millisecond as before and is 0.5 milliseconds for every additional cylinder.
a. Write an equation for this seek time like a function of the seek distance.
b. Utilizing the seek-time function from a part calculate the total seek time for each of the schedules in Exercise 12.2. Is your answer the similar as it was for Exercise 12.3(c)?
c. What is the percentage accelerate of the fastest schedule over FCFS in this case?
Answer:
a. t = 0.95 + 0.05L
b. FCFS 362.60; SSTF 95.80; SCAN 497.95; LOOK 174.50; C-SCAN 500.15; (and C-LOOK 176.70). SSTF is still the winner as well as LOOK is the runner-up.
c. (362.60 - 95.80)/362.60 = 0.74 the percentage accelerate of SSTF over FCFS is 74% with respect to the seek time. If we comprise the overhead of rotational latency and data transfer the percentage speedup will be less.
Describe when you run an unlink() operation to remove a file on the ext3 file system. Be specific about what disk blocks have to be written where in what order. State your assumpti
We have stressed the need for an operating system to make efficient use of the computing hardware. When is it appropriate for the operating system to forsake this principle and to
Additional Reference bits algorithm Here we keep an 8-bit byte for every page in memory. At standard intervals the reference bit is shifted by the OS. If a shift register conta
Explain the ThreadSwitch function used in the netware Since NetWare 3 and 4 are nonpreemptive environments, it may be necessary for the application developer to explicitly reli
What are the different file operations? Create : - Space for the file in the file system update directory table. Write : - file name and data to be written is
Q. Capability lists are typically kept within the address space of the user. How does the system make sure that the user cannot modify the contents of the list? Answer: An ap
how the system call is work?
At the end of this lecture, and into the next lecture, we will discuss the last major type of logical error that can occurwhen programming with threads. A deadlock occurswhen two t
Demand paging gives that pages could only be brought into memory if the running process acts them. This is usually referred to as lazy evaluation as only those pages operated by
Many-to-Many Model The many-to-many model- many user-level threads to many kernel-level threads avoids several of the limitations of the one-to-one model, although extending mu
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd