https://github.com/csko/paging

Online paging, example implementation
https://github.com/csko/paging

Last synced: 12 months ago
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Online paging, example implementation

• Host: GitHub
• URL: https://github.com/csko/paging
• Owner: csko
• Created: 2012-02-22T19:39:32.000Z (over 14 years ago)
• Default Branch: master
• Last Pushed: 2012-02-24T21:20:45.000Z (over 14 years ago)
• Last Synced: 2025-06-21T23:36:15.599Z (12 months ago)
• Language: Python
• Homepage: http://csko.hu
• Size: 397 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
Online Paging problem

=====================

This is a student project for simulating solutions for the

[online paging problem](http://en.wikipedia.org/wiki/Page_replacement_algorithm). Also contains an implementation of the optimal offline algorithm for approximating the competitive ratio. The two algorithms are:

* [Least Recently Used (LRU)](http://en.wikipedia.org/wiki/Page_replacement_algorithm#Least_recently_used)

* [First In, First Out (FIFO)](http://en.wikipedia.org/wiki/Page_replacement_algorithm#First-in.2C_first-out)

Example usage

============

* ``

  ./single.py 5 20 3

``

    A single run of both algorithms with 5 pages, 20 input pages, and internal storage size 3.

* ``./average.py 1000 200 100 50``

    Calculates the average over 50 tries for 1000 pages, 200 input pages, and internal storage size 100.

* ``./env.py``

    Runs extensive simulations over many parameters.

Contents

========

* ``doc/``

  Documentation in PDF format. Also includes the source in LyX and LaTeX.

* ``alg.py``

  Base class for algorithms.

* ``lru.py``

  Implementation of the LRU algorithm.

* ``fifo.py``

  Implementation of the FIFO algorithm.

* ``incstats.py``

  Class for calculating average incrementally.

* ``env.py``

  General environment for running tests. Contains the optimal offline solution implementation.

* ``single.py``

  Script for calculating a single run.

* ``average.py``

  Script for calculating average over runs.

* ``stats.gp``

  gnuplot script for plotting the results of ``env.py``.

Documentation

=============

Some additional documentation is provided in the doc/ directory,

however, most of it's in Hungarian.