Scaling gysela code beyond 32K-cores on bluegene/Q J. Bigot, V. Grandgirard, G. Latu, Ch. Passeron, F. Rozar and O. Thomine ESAIM: Proc., 43 (2013) 117-135 Published online: 13 December 2013 DOI: 10.1051/proc/201343008