使用numba的姿势不正确反而导致性能下降
numba能够极大的提高python在计算方面的性能。是不是所有的python代码上,都可以加上numba.jit装饰器?答案是否定的。
示例
环境
python3.6 fedora pymysql
示例
很常见的例子,从数据库从查询一千条数据,再进行简单的格式转换。
#coding=utf-8 import time from numba import jit import pymysql conn = pymysql.connect("192.168.10.125", "username", "password", "db_name") #@jit #位置1 def test_for(): c =conn.cursor() c.execute("select * from user limit 1000") start = time.time() for a in c.fetchall(): to_dict(a, c.description) end = time.time() print("cost_seconds:", end-start) #@jit #位置2 def to_dict(row, description): """ 记录转为字典 """ item = dict() for i, field in enumerate(description): field_name = field[0] item[field_name] = row[i] return item test_for()
结果
python3 0.0033788681030273438 python3 +位置1jit 0.08921098709106445 python3 + 位置1jit+位置2jit 3.846426010131836 pypy 0.0065860748291015625
对比结果,发现如果是非计算问题,引入即时编译,反而导致性能下降。实际python在非计算问题上性能很好。
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