The best way to read big file ??

[Braunstein]

Hi,

I read such files binary by using standard C++ streams. In order to improve speed i use my own stream buffer and reading in chunks (with buffer size). The interpretation of line ends can be done later directly on the buffer.
Up to now i don't use multithreading. It makes only sense for me if you need some further interpretation (parsing) of the data.

[anda_skoa]

You could experiement with QFile::map() to slide a window over the file, i.e. map a section of the file into memory, take whatever data you need, map the next section.

Mapping a file or parts of a file into memory allows the operating system to coordinate file system buffers, optimize read/writes, avoid copying (from FS buffer to application memory), etc.

Cheers,
_