fopen：是好主意离开，还是使用缓冲区？ [英] fopen: is it good idea to leave open, or use buffer?

问题描述

所以我有很多日志文件，我需要写入。它们在程序开始时创建，并在程序关闭时保存到文件。

我想知道在程序启动时是否更好：

fopen文件在程序结束时 - 我只是在需要时写入文件。

$ b p>我保存需要写入缓冲区，然后打开文件，从缓冲区写入，当程序结束时关闭文件。

$ p

解决方案

好吧， fopen（3）+ fwrite（3） fclose（3） 是一个缓冲的I / O包，所以在它之上的另一层缓冲可能只是减慢了。

无论如何，去一个简单而正确的程序。如果它似乎运行缓慢，配置它，然后优化基于证据，而不是猜测。

So I have many log files that I need to write to. They are created when program begins, and they save to file when program closes.

I was wondering if it is better to do:

fopen() at start of program, then close the files when program ends - I would just write to the files when needed. Will anything (such as other file io) be slowed down with these files being still "open" ?

OR

I save what needs to be written into a buffer, and then open file, write from buffer, close file when program ends. I imagine this would be faster?

解决方案

Well, fopen(3) + fwrite(3) + fclose(3) is a buffered I/O package, so another layer of buffering on top of it might just slow things down.

In any case, go for a simple and correct program. If it seems to run slowly, profile it, and then optimize based on evidence and not guesses.

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