Question

为什么python代码运行的速度却截然不同，尽管相同的代码运行了两次？

代码

我正在为一个简短的Python代码做一些分析：

import urllib3

@profile
def download(url, file_path):
    http = urllib3.PoolManager()
    r = http.request("GET", url)
    print("FINISHED GET!")
    print("WRITING TO "+file_path)
    with open(file_path, "wb") as f:
        f.write(r.data)
    r.release_conn()

url = "http://interactivepaper.todayonline.com/jrsrc/260516/260516.pdf"

download(url, "")

测试

我正在使用line_profiler命令kernprof -l -v test.py。我多次测试了这段代码，所有结果都不一致。

测试1：

FINISHED GET!
WRITING TO 
Wrote profile results to test.py.lprof
Timer unit: 1e-06 s

Total time: 44.653 s
File: test.py
Function: download at line 3

Line #      Hits         Time  Per Hit   % Time  Line Contents
==============================================================
     3                                           @profile
     4                                           def download(url, file_path):
     5         1          273    273.0      0.0      http = urllib3.PoolManager()
     6         1     44652667 44652667.0    100.0      r = http.request("GET", url)
     7         1           37     37.0      0.0      print("FINISHED GET!")
     8         1            4      4.0      0.0      print("WRITING TO "+file_path)
     9         1           29     29.0      0.0      with open(file_path, "wb") as f:
    10                                                   f.write(r.data)
    11                                               r.release_conn()
(There was an IO Error from here onwards as I used an empty string)

测试2（我编辑了代码）：

FINISHED GET!
WRITING TO 
Wrote profile results to test.py.lprof
Timer unit: 1e-06 s

Total time: 44.6693 s
File: test.py
Function: download at line 3

Line #      Hits         Time  Per Hit   % Time  Line Contents
==============================================================
     3                                           @profile
     4                                           def download(url, file_path):
     5         1          186    186.0      0.0      http = urllib3.PoolManager()
     6         1     44669082 44669082.0    100.0      r = http.request("GET", url)
     7         1           42     42.0      0.0      print("FINISHED GET!")
     8         1            4      4.0      0.0      print("WRITING TO "+file_path)

测试3：

FINISHED GET!
WRITING TO 
Wrote profile results to test.py.lprof
Timer unit: 1e-06 s

Total time: 4.53504 s
File: test.py
Function: download at line 3

Line #      Hits         Time  Per Hit   % Time  Line Contents
==============================================================
     3                                           @profile
     4                                           def download(url, file_path):
     5         1          262    262.0      0.0      http = urllib3.PoolManager()
     6         1      4534736 4534736.0    100.0      r = http.request("GET", url)
     7         1           37     37.0      0.0      print("FINISHED GET!")
     8         1            4      4.0      0.0      print("WRITING TO "+file_path)

这是我发现令人困惑的部分。 首先运行44秒的进程现在需要4秒才能运行。我还注意到，无论何时编辑文件，都需要很长时间才能再次运行。以下是另外三个测试证明了我的观点：

编辑后的第一次测试：

Wrote profile results to test.py.lprof
Timer unit: 1e-06 s

Total time: 49.7018 s
File: test.py
Function: download at line 3

Line #      Hits         Time  Per Hit   % Time  Line Contents
==============================================================
     3                                           @profile
     4                                           def download(url, file_path):
     5         1          187    187.0      0.0      http = urllib3.PoolManager()
     6         1     49701585 49701585.0    100.0      r = http.request("GET", url)

编辑后的第二次测试：

Timer unit: 1e-06 s

Total time: 9.10985 s
File: test.py
Function: download at line 3

Line #      Hits         Time  Per Hit   % Time  Line Contents
==============================================================
     3                                           @profile
     4                                           def download(url, file_path):
     5         1          185    185.0      0.0      http = urllib3.PoolManager()
     6         1      9109665 9109665.0    100.0      r = http.request("GET", url)

编辑后的第三次测试（类似于第二次测试）：

Wrote profile results to test.py.lprof
Timer unit: 1e-06 s

Total time: 12.9593 s
File: test.py
Function: download at line 3

Line #      Hits         Time  Per Hit   % Time  Line Contents
==============================================================
     3                                           @profile
     4                                           def download(url, file_path):
     5         1          189    189.0      0.0      http = urllib3.PoolManager()
     6         1     12959072 12959072.0    100.0      r = http.request("GET", url)

Answer 1

主要区别在于以下代码行：

r = http.request("GET", url)

在此行中，您尝试访问远程Web服务器。

以下原因可能导致对Web服务器的访问时间不同：

1）缓存

2）网络负载

3）远程服务器负载

Python line profiler结果不一致

1 个答案: