Question

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:

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 ratio and success ratio.

Answer 1

The FIFO page removal algorithm is used to manage page frames. The page trace analysis for a given scenario can be determined by following the algorithm. The failure ratio and success ratio can be calculated based on the number of page faults.

Step-by-step explanation:

When using the FIFO (First-In-First-Out) page removal algorithm with three page frames for public use and a seven-page program requesting pages in the order of a, b, c, d, e, f, g, the movement of the pages into and out of the page frames can be determined. The page trace analysis for this scenario would be as follows:

1. Page a enters the first page frame.
2. Page b enters the second page frame.
3. Page c enters the third page frame, replacing page a (page fault*).
4. Page d enters the first page frame, replacing page b (page fault*).
5. Page e enters the second page frame, replacing page c (page fault*).
6. Page f enters the third page frame, replacing page d (page fault*).
7. Page g enters the first page frame, replacing page e (page fault*).

By analyzing the page trace, we can calculate the failure ratio and success ratio:

Failure ratio = Number of page faults / Total number of page requests

Success ratio = 1 - Failure ratio