xbt_dynar_sort(smpi_factor, &factor_cmp);
xbt_dynar_foreach(smpi_factor, iter, fact) {
XBT_DEBUG("smpi_factor:\t%ld : %d values, first: %f", fact.factor, fact.nb_values ,fact.values[0]);
xbt_dynar_sort(smpi_factor, &factor_cmp);
xbt_dynar_foreach(smpi_factor, iter, fact) {
XBT_DEBUG("smpi_factor:\t%ld : %d values, first: %f", fact.factor, fact.nb_values ,fact.values[0]);