python - (Python) time.clock() 的意外输出

Question

在理解 time.clock() 的输出时遇到一些问题:

Linux 3.5.0-17-generic#28-Ubuntu SMP 10 月 9 日星期二 19:31:23 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux经销商 ID:LinuxMint描述:Linux Mint 14 Nadia发布:14代号:nadia

Python 2.7.3 (default, Sep 26 2012, 21:51:14) 
[GCC 4.7.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from time import clock, sleep, time
>>> while True: sleep(1); print clock()
... 
0.03
0.03
0.03
0.03
0.03
^CTraceback (most recent call last):
  File "<stdin>", line 1, in <module>
KeyboardInterrupt
>>> while True: sleep(1); print time()
... 
1382460160.37
1382460161.37
1382460162.37
1382460163.38
1382460164.38
^CTraceback (most recent call last):
  File "<stdin>", line 1, in <module>
KeyboardInterrupt

# ...wait a few minutes...

>>> while True: sleep(1); print clock()
... 
0.04
0.04
0.04
0.04
0.04
0.04
^CTraceback (most recent call last):
  File "<stdin>", line 1, in <module>
KeyboardInterrupt
>>> 

$ cat test.py
#! /usr/bin/python

from time import sleep, time, clock

while True:
    print clock(), time()
    sleep(1)


$ python test.py
0.02 1382460623.39
0.02 1382460624.39
0.02 1382460625.39
0.02 1382460626.39
0.02 1382460627.39
0.02 1382460628.39
0.02 1382460629.4
0.02 1382460630.4
0.02 1382460631.4
0.02 1382460632.4
0.02 1382460633.4
0.02 1382460634.4
0.02 1382460635.4
0.02 1382460636.4
0.02 1382460637.41
0.02 1382460638.41
0.02 1382460639.41
0.02 1382460640.41
0.02 1382460641.41
0.02 1382460642.41
0.02 1382460643.41
0.02 1382460644.41
0.02 1382460645.41
0.02 1382460646.42
0.02 1382460647.42
0.02 1382460648.42
0.02 1382460649.42
0.02 1382460650.42
^CTraceback (most recent call last):
  File "test.py", line 7, in <module>
    sleep(1)
KeyboardInterrupt

我显然在这里遗漏了一些明显的东西？

Answer 1

在 Linux 系统上，time.clock() 返回“处理器时间”，而不是“挂钟时间”。