c++ - Optimal Buffer size for read-process-write -

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In my function, I have to read some data in a buffer from a file, manipulate data and write it in another File. The file is of an unknown size and can be very large.

If I use a small buffer, then there will be a long read / write cycle and it will take longer. Conversely, long buffer means that I need to consume more memory should I use the optimum buffer size? Is this matter dependent?

I have seen some apps like 'yours copy' in windows that manage large files efficiently.

Note: This program will be running under Windows.

See what Microsoft has to say about IO size: In fact, they say that you IO should do in 64K blocks. On the NIX platform, the struct stat has a st_blksize member who says what should be a minimum Io block size.

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