Function fmt_dist

test/bench.py:175–176

(c: Counter, top=5)

    errors = Counter(r.error for r in fail)

    def fmt_dist(c: Counter, top=5):
        return ", ".join(f"{k}:{v}" for k,v in c.most_common(top)) or "-"

    def fmt_perc(vals, name):
        p = percentiles(vals)