Compsys is a common research project-team, located at Ecole normale supérieure de Lyon (ens -l yon). It exists since January 2002 as part of Laboratoire de l'Informatique du Parallélisme (Lip, umr cnrs ens -l yon ucb -l yon Inria 5668) and as an Inria pre-project. It became a full Inria project in January 2004. It has been evaluated by Inria in Spring 2007 and extended 4 more years. It has been evaluated by aeres in December 2010 and received the mark A+. It will be evaluated again by Inria in Spring 2012.

The goal of Compsys is to develop compilation techniques, more precisely code optimization techniques, for programming or designing embedded computing systems. Compsys focuses on both low-level (back-end) optimizations for embedded processors and high-level (front-end, mainly source-to-source) transformations for high-level synthesis of hardware accelerators. The main characteristic of Compsys is its focus on combinatorial optimization problems (graph algorithms, linear programming, polyhedra) coming from code optimization problems (register allocation, memory optimization, scheduling, automatic generation of interfaces, etc.) and the validation of these techniques in the development of compilation tools.