OWINF Grading System

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OWINF Grading System

• Perspectives on Computer Science Competitions for
  (High School) Students
• Tobias Polley, rrayst_at_owinf.de
• January 24th, 2006

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Overview

• What is the OWINF?
• Aspects of a Grading System
• History
• Requirements and Usage
• Features
• Live demo

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what is it?

• just another OI
• completely in German
• online competition

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categorization

• Overall
• performance
• fairness/objectivity
• security
• error handling and recovery

• Contestant
• what possibilities does the system offer?

• Administrator
• installation
• contest setup,
• esp. tasks
• maintenance
• finish up
• additional features?

Contest System

• Developer
• easy to read
• easy to write

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History

• successor of the system used at CEOI 2003
  (Münster, Germany) and at our national training
  camps.
• MySQL database
• PHP web frontend
• Filesystem for static data (tasks, graders, etc.)
• Perl grading server and clients

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System overview
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Requirements

• Software Components
• one server
• one database
• multiple grading clients (at least one)
• gt one computer is enough (theoretically),
  although objectivity as well as security is
  improved by separate grading clients

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Requirements

• Hardware
• Database e.g. 70MB (for 1st OWINF)
• Server 512MB RAM
• speed depends on usage requirements
• Grading Client 300MB RAM
• all grading clients should be equal
• speed is relevant for the timelimits

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Requirements

• Software
• Database MySQL 5.x
• Server and Clients Java 1.5
• Server Ant, Tomcat 5.5.x
• Client Linux Kernel
• Everything else you are planning to use
• Server (Reports) LaTeX, ConTeXt, ghostscript,
  metapost, zip
• Server (Printing) a2ps
• Client (Compilers) GCC, FreePascal

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Installation

• Server
• Create a MySQL database and a user
• Unzip Ant and Tomcat
• Checkout our source code from Subversion
• Set two environment variables
• Create one configuration file containing
• the MySQL hostname, user and password as well as
• the directory where the checked out source code
  is.
• Call build.sh (or build.bat)
• Start Tomcat

http//owinf.de/book/
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Installation

• Grading Clients
• copy grading-client.jar from the server to the
  grading clients
• install the root-it program as setuid root
• Command Line Tools (CLT)
• the same as the server installation
• create a symlink called clt in your PATH (or copy
  clt.bat into it)

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Data Model

• (simplified)

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Live demo

• Administrator
• Contest and Task creation (CLT)
• Contestant
• Submitting a program
• Administrator
• Observing the contest
• Reports

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Features

• all IOI task types supported (batch, reactive and
  output-only)
• As the actual grading is done by user scripts (or
  programs), you can do anything you want
• E.g. syntax verification instead of compilation,
  etc.

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Features

• multiple grading clients with a prioritized job
  queue
• improves responsiveness of the system
• allows large background jobs as complete
  (re)grading of a task or day without bad impact

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Features

• web interface for the contestants is completely
  internationalized
• allows easy switching of the language used in the
  web interface
• The HTML page layout depends on the style which
  is a property of a Contest.
• This allows you to change it easily (switch forth
  and back).

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Features

• flexible report generation
• choose report type
• (e.g. score-table)
• choose output format
• (e.g. PDF)
• adjust parameters
• (e.g. dont show scores of bottom x, x50)
• get report
• use your own logos (style-dependent) on existing
  reports

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Features

• flexible report generation
• existing reports
• score overview table
• detailed score reports
• participation certificates for OWINF
• password slips for contestants

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Features

• Subversion integration
• allows multiple persons to edit the same task
  without having us to worry about conflicts
• provides the development history
• User Registration

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Getting it

• Closed source at the moment, but available to
  anyone who asks.
• (Various reasons, we can discuss them later...)
• No tarballs, but there are tags in the Subversion
  repository for stable versions.

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The team

• Felix Arends
• Dominic Battré
• Hans-Christian Ebke
• Jonas Müller
• Julian Rüth
• Tobias rrayst Polley rrayst_at_owinf.de
• owinf on the IRCnet

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