Write an equation for this seek time, Operating System

Assignment Help:

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.


Related Discussions:- Write an equation for this seek time

Describe the technique of packing, Describe the technique of packing. T...

Describe the technique of packing. The physical record size will not accurately match the length of the desired logical record and the Logical records may even differ in length

Which are the different states of a process, Which are the different states...

Which are the different states of a process?   Different status of a process is: New: When the process is created. Running: When instructions are executed. Wait

Explain external fragmentation?, Explain external fragmentation? Extern...

Explain external fragmentation? External fragmentation is the process where the free space and the space still available for use, in a piece of storage become separated into ma

Sharing memory, As we have discussed, page tables map virtual page addresse...

As we have discussed, page tables map virtual page addresses to physical page addresses. One of the advantages of using virtual addresses is that we can achieve complete separation

Define server processing with queues, Define Server Processing with Queues ...

Define Server Processing with Queues The efficient server processing of client request is essential for optimized client- server applications. This process is greatly enhanced

Network operating system and a distributed operating system, Problem: (...

Problem: (a) (i) Explain what a single system image is and how it is related to the concept of a distributed operating system? (ii) What are the main differences between a

Explain fixed partitioning in memory management, FIXED PARTITIONING Us...

FIXED PARTITIONING Using fixed partitioning we are able to allocate the memory Here we are dividing the memory into a few fixed partitions.Every partition may not be of the si

integrator circuit, Referring to Figure below, discuss how you would alter...

Referring to Figure below, discuss how you would alter the circuit to obtain: 1. a straightforward amplifier with gain 1, 2. a straightforward amplifier with gain 10, 3. a

How program execute in operating system, Q. How Program execute in operatin...

Q. How Program execute in operating system? Program execution- The operating system fills the contents (or sections) of a file into memory as well as begins its execution. A us

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