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 :

• Download and install instructions.

• 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 subscribe 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

Once you have downloaded Cheddar source code, you will need the following packages :

• For windows :

Packages	Instructions
The GNAT compiler	Use GNAT GPL 2007. See ​AdaCore web site
Gtk and GtkAda	See ​http://www.gtk.org for details. Use the file in Cheddar SVN repository (required_packages/GtkAda_windows.zip)
XmlAda	Use the file in Cheddar SVN repository (required_packages/xmlada-gpl-2.2.0.zip)
Aflex and Ayacc	if you plan to change the code of the parametric simulator
big number	From Jérôme Delcourt. Use the file in Cheddar SVN repository (required_packages/big_number-0.28.zip)
Ocarina AADL Parser	Distributed by the ​ENST Paris. Download ​release 1.1

• For Linux :

Packages

Instructions

• For Solaris :

Packages

Instructions

Cheddar Compilation/Installation?

The following IDE can be used Cheddar can be built using IDE :

• ​GPS (GNAT Programming Studio) (recommended) : building instructions?.

• ​AdaGide : building instructions?.