timehist_quartile
timehist_quartile(hist, 0.25),
timehist_quartile(hist, 0.50),
timehist_quartile(hist, 0.75));
double timehist_quartile(struct timehist* hist, double q);
s->mesh_time_median = timehist_quartile(worker->env.mesh->histogram,
timehist_quartile(hist, 0.25),
timehist_quartile(hist, 0.50),
timehist_quartile(hist, 0.75));
double timehist_quartile(struct timehist* hist, double q);