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OWINF Grading System

Overview. What is the OWINF?Aspects of a Grading SystemHistoryRequirements and UsageFeaturesLive demo. what is it?. just another OIcompletely in Germanonline competition. categorization. . ContestSystem. Contestantwhat possibilities does the system offer?. Developereasy to readeasy to

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OWINF Grading System

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    1. OWINF Grading System Perspectives on Computer Science Competitions for (High School) Students Tobias Polley, rrayst@owinf.de January 24th, 2006

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

    3. what is it? just another OI completely in German online competition six volunteers from BWINF Alumni und Freunde e.V.six volunteers from BWINF Alumni und Freunde e.V.

    4. categorization “objectivity” meaning reproducability“objectivity” meaning reproducability

    5. 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 subversion, wiki, bugzillasubversion, wiki, bugzilla

    6. System overview

    7. Requirements Software Components: one server one database multiple grading clients (at least one) => one computer is enough (theoretically), although objectivity as well as security is improved by separate grading clients

    8. 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 contest-testcontest-test

    9. 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

    10. 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

    11. 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)

    12. Data Model (simplified)

    13. Live demo Administrator Contest and Task creation (CLT) Contestant Submitting a program Administrator Observing the contest Reports

    14. 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.

    15. 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

    16. 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).

    17. 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%”, x=50) get report use your own logos (style-dependent) on existing reports

    18. Features flexible report generation existing reports: score overview table detailed score reports participation certificates for OWINF password slips for contestants

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

    20. 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.

    21. The team Felix Arends Dominic Battré Hans-Christian Ebke Jonas Müller Julian Rüth Tobias ‘rrayst’ Polley rrayst@owinf.de #owinf on the IRCnet

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