compare.py 文件源码

def quantity_delta(base, changed):
    old = base.mean()
    new = changed.mean()
    is_time = (base.get_unit() == 'second')

    if old == 0 or new == 0:
        return "incomparable (one result was zero)"
    if new > old:
        if is_time:
            return "%.2fx slower" % (new / old)
        else:
            return "%.2fx larger" % (new / old)
    elif new < old:
        if is_time:
            return "%.2fx faster" % (old / new)
        else:
            return "%.2fx smaller" % (old / new)
    else:
        return "no change"