Computer and technology

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computer and technology

1. Chapter 3. Question 4

Assume a program has 510 bytes and will be loaded into page frames of
256 bytes each, and the instruction to be used is at byte 377. Answer the
following questions:

a. How many pages are needed to store the entire job?

b. Compute the page number and exact displacement for each of the byte addresses where the data is stored.

2. Chapter 3. Questions 5a, 5b, 5c

Given that main memory is composed of only three page frames for public use
and that a seven-page program (with Pages a, b, c, d, e, f, g) that requests pages
in the following order:
a, c, a, b, a, d, a, c, b, d, e, f

a. Using the FIFO page removal algorithm, indicate the movement of the
pages into and out of the available page frames (called a page trace analysis). Indicate each page fault with an asterisk (*). Then compute the failure and success ratios.

b. Increase the size of memory so it contains four page frames for public use.
Using the same page requests as above and FIFO, do another page trace
analysis and compute the failure and success ratios.

c. What general statement can you make from this example? Explain your
answer.

3. Chapter 3. Questions 6a, 6b, 6c

Given that main memory is composed of only three page frames for public use
and that a program requests pages in the following order:
a, c, b, d, a, c, e, a, c, b, d, e

a. Using the FIFO page removal algorithm, indicate the movement of the
pages into and out of the available page frames (called a page trace
analysis) indicating each page fault with an asterisk (*). Then compute
the failure and success ratios.

b. Increase the size of memory so it contains four page frames for public use.
Using the same page requests as above and FIFO, do another page trace
analysis and compute the failure and success ratios.

c. What general statement can you make from this example? Explain your
answer.

4. Chapter 4. Questions 3a, 3b, 3c

Five jobs arrive nearly simultaneously for processing and their estimated CPU
cycles are, respectively: Job A = 12, Job B = 2, Job C = 15, Job D = 7, and
Job E = 3 ms.

a. Using FCFS, and assuming the difference in arrival time is negligible, in what order would they be processed? What is the total time required to process all five jobs? What is the average turnaround time for all five jobs?

b. Using SJN, and assuming the difference in arrival time is negligible, in what order would they be processed? What is the total time required to process all five jobs? What is the average turnaround time for all five jobs?

5. Chapter 4. Question 7

Using SJN, calculate the start time and finish time for each of these seven jobs:
Job Arrival Time CPU Cycle
A 0 2
B 1 11
C 2 4
D 4 1
E 5 9
F 7 4
G 8 2

Reference no: EM13760284

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