An approach to increase reliability of HPC simulation, application to the Gysela5D code Julien Bigot, Guillaume Latu, Thomas Cartier-Michaud, Virginie Grandgirard, Chantal Passeron and Fabien Rozar ESAIM: Proc., 53 (2016) 248-270 Published online: 01 April 2016 DOI: 10.1051/proc/201653015