2015.01.01 20:24 "Re: [Tiff] Fast TIFF Reading on Windows", by Aaron Boxer

2015.01.05 09:53 "Re: [Tiff] Fast TIFF Reading on Windows", by John

On 5 January 2015 at 03:36, Aaron Boxer <boxerab@gmail.com> wrote:

  1. TIFFOpenfile with mode "ru" i.e. disabling memory mapping, was 3 times

slower than with default flag "r"

So, my conclusion is that memory mapping is the way to go for performance.

That's interesting. I tried on linux and the situation is roughly reversed: with the disc cache empty, mmap() is about half the speed of vanilla read() (for me). This is for a a simple scan of a 300mb strip tiff on an HDD. I'm always surprised how different the filesystems are.

John