是否可以加快python IO的速度?

问题描述

考虑以下python程序:

Consider this python program:

import sys

lc = 0
for line in open(sys.argv[1]):
    lc = lc + 1

print lc, sys.argv[1]

在我的6GB文本文件上运行它，大约需要2分钟即可完成.

Running it on my 6GB text file, it completes in ~ 2minutes.

问题:有可能走得更快吗?

请注意，同一时间是必需的:

Note that the same time is required by:

wc -l myfile.txt

所以，我怀疑我的疑问只是一个简单的否".

so, I suspect the anwer to my quesion is just a plain "no".

还请注意，我的真实程序正在做的事情不仅仅是计数行，所以请给出一个通用的答案，不行计数技巧(例如将行计数元数据保存在文件中) )

Note also that my real program is doing something more interesting than just counting the lines, so please give a generic answer, not line-counting-tricks (like keeping a line count metadata in the file)

PS:我将此问题标记为"linux"，因为我仅对特定于linux的答案感兴趣.如果有答案，请随时提供与操作系统无关的答案，甚至与其他操作系统无关.

PS: I tagged "linux" this question, because I'm interested only in linux-specific answers. Feel free to give OS-agnostic, or even other-OS answers, if you have them.

另请参见后续问题

推荐答案

您无法获得比最大磁盘读取速度更快的速度.

You can't get any faster than the maximum disk read speed.

为了达到最大磁盘速度，您可以使用以下两个技巧:

In order to reach the maximum disk speed you can use the following two tips:

1. 使用大缓冲区读取文件.既可以手动"编码，也可以简单地使用io.BufferedReader(在python2.6 +中提供)进行编码.
2. 在另一个线程中并行进行换行计数.

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