read two files simultaneously

[Wojciech Puchar]

> I'm just guessing inode structure, the physical file location on HDD
> might be related to this. But, if I read only one file, the size
> doesn't matter. Reading file (10M, 100M, 700M) gives constantly about
> 70MB/s, and the weird thing happens when I read 2 files of big size.

if you use O_DIRECT it's read from disk exactly as you specified, without 
readahead, so you do a lot of seeks.

simply use bigger buffer like 1MB