1. TOTAL; Centre Scientifique et Technique Jean Féger; avenue de Larribau F-64000 Pau; France
2. INPT-IRIT; University of Toulouse and ENSEEIHT; 2 Rue Camichel; BP 7122; F-31071 Toulouse Cedex 7; France
3. CERFACS; 42 Avenue Gaspard Coriolis; F-31057 Toulouse Cedex 1; France
4. CERFACS and HiePACS project joint INRIA-CERFACS Laboratory; 42 Avenue Gaspard Coriolis; F-31057 Toulouse Cedex 1; France