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Welcome to Cheddar Wiki
Cheddar is a free real time scheduling tool. Cheddar is designed for checking task temporal constraints of a real time application/system. Systems to analyze can be described with AADL or a with Cheddar specific language. It can help you for quick prototyping of real time schedulers. It can also be used for educational purpose. Cheddar is developed and maintained by the LISYC Team, University of Brest.
Cheddar relies on Ocarina to provide schedulability analysis of AADL models. The ocarina team also use the Cheddar analyzer for their research projects and some tutorial/labs. There is a strong cooperation between the two teams.
Cheddar can be run as a STOOD or as a TOPCASED plug in. The interoperability of STOOD/TOPCASED/Cheddar is managed by Pierre Dissaux (Ellidiss software) . There is also a strong cooperation between the Cheddar team and Ellidiss technologies to investigate how Cheddar can be efficiently analyze AADL models built with STOOD.
Our real time scheduling simulator is composed of two independent parts : a graphical editor used to describe a real time application/system, and a framework which includes most of classical real time scheduling/feasibility algorithms/tests.
Cheddar is written in Ada?. The graphical editor is made with GtkAda?. Cheddar runs on Solaris, Linux and win32 boxes and should run on every GNAT/GtkAda supported platforms ( see AdaCore web site for details).
Cheddar Users
Useful information can be found at Cheddar official web page :
- A mailing list which is used to share information between Cheddar users.
Furthermore, if you want to report bugs, ask for a new features, participate to Cheddar development, ... You can subscribe? to the Cheddar wiki list.
Cheddar developers
This wiki is also use to provide support for Cheddar developers.
Cheddar Source Code
Cheddar source code can be found at the following SVN repository address (a write access will be granted if you have subscribed to the Cheddar wiki list).
One can use several tools to access Cheddar SVN repository like TortoiseSVN (a list of SVN client is available here).
Additional Packages
Cheddar is built using the GNAT compiler GPL 2007 (see [https://libre.adacore.com/ AdaCore web site).
Furthermore, the following packages are needed to build Cheddar (available in Cheddar repository (required_packages))
| Packages | Comment |
| Gtk and GtkAda | See http://www.gtk.org for details |
| XmlAda | See https://libre.adacore.com/ |
| Aflex and Ayacc | If you plan to change the code of the parametric simulator |
| big number | From Jérôme Delcourt |
| Ocarina AADL Parser | Distributed by the ENST Paris |
Cheddar Compilation/Installation?
One can use any text editor and shell tool or the following IDE to build and install Cheddar :
- GPS (GNAT Programming Studio) (recommended).
Check the building instructions page for further information.
