Design a memory buffer of limited size, Computer Engineering

Assignment Help:

Extend task 1 so that it now supports a memory buffer of limited size. Provide the same functionality as task 1 except now make the server work with a limited buffer size.

Like task 1, the server is the only thread that can access the buffer directly.

1. Allow user to specify a 2nd command line argument which specifies the buffer size in terms of the number of pages. Let that number be B.

2. The server reads the first B pages from the init_buffer_pages.dat file into the buffer. It then copies all the pages into a store file. You can organize the store file anyway you want as long as it stores all pages including those not in memory. I recommend that you use a binary file to do this since that allows you to do random seeks on the file. Assume all pages have a fixed size of 4096 characters.

3. When a page request for a non-buffer resident page occurs one page that is currently in the buffer must be evicted from memory to make room for the newly requested page to be loaded from the store file. The page replacement policy you need to implement is the least recently used (LRU) policy. Please read page 489 of the textbook for an explanation of the LRU policy.

4. Once a page to be evicted has been chosen then the program must decide whether it should be flushed to the store file or discarded.
a) If the page has been dirtied (modified) since its last load from disk then it should be flush to the store file on disk.
b) Otherwise it should be discarded without flushing to the store file.

5 The server needs to keep a log of the sequence of page evictions (pages either discarded or flushed to disk) in a log file called "server_log.dat". The entries in the log file are in the order that they were evicted. Looking at this file I will be able to tell if you have implemented the LRU page-replacement policy correctly.

The server_log.dat file should be in the following format:


...
...

For example:

20 abscde
10 KJlkljf
29 jjkjkKKH


Related Discussions:- Design a memory buffer of limited size

Memory management unit, A computer system with 16K of memory, a Memory Mana...

A computer system with 16K of memory, a Memory Management Unit with a page size of 2000, and the following page translation table :      Logical Address    Physical Start 0000

Probabilistic hough transformation, The probabilistic Hough transform uses ...

The probabilistic Hough transform uses random sampling instead of an accumulator array. In this approach the number of random samples r, is not specified in the OpenCV call, but

Determine the workarounds in multiple inheritances, What are several issues...

What are several issues for selecting best workarounds in multiple inheritances? Some restrictions methods are used. Use two approaches of delegations, which is an implementati

Displaying the list of files with dir, Q. Displaying the List of Files with...

Q. Displaying the List of Files with DIR? You can display the list of files kept in a diskette or hard disk with the DIR commend. This Commends list files and sub directories i

Give difference between top down and bottom up parsing, Give difference bet...

Give difference between top down parsing and bottom up parsing. Top down parsing: Specified an input string, top down parsing tries to derive a string identical to this by s

Describe about the database marketing application of olap, Database marketi...

Database marketing tool or application helps a user or marketing professional in determining the right tool or plan for his valuable add campaign. This tool haves data from all sou

What is cache memory, Q. What is Cache Memory? Cache memory is a very f...

Q. What is Cache Memory? Cache memory is a very fast and small memory between CPU and main memory whose access time is closer to processing speed of CPU. It behaves as a high-s

Data stream and instruction stream-flynn’s classification, Data Stream an...

Data Stream and Instruction Stream The term 'stream' refers to an order or flow of either data operated or instructions on by the computer. In the complete chain of instructi

How can system improved when free lines are available, How can system impro...

How can system improved if one arrive at the probability of availability of free lines during the busy hour? Improvement can be made when the system is act as a loss system in

How will you prepare problem statement, How will you prepare problem statem...

How will you prepare problem statement? Problem statement should state what is to be completed and not how it is to be executed. It should be a statement of requirements not a

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