2015.01.01 20:24 "Re: [Tiff] Fast TIFF Reading on Windows", by Aaron Boxer
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2015.01.01 17:12 "Re: [Tiff] Fast TIFF Reading on Windows", by Bob Friesenhahn
- 2015.01.01 17:27 "Re: [Tiff] Fast TIFF Reading on Windows", by John
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2015.01.01 20:20 "Re: [Tiff] Fast TIFF Reading on Windows", by Aaron Boxer
- 2015.01.03 05:24 "Re: [Tiff] Fast TIFF Reading on Windows", by Edward Lam
- 2015.01.05 13:47 "[Tiff] Fwd: 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:
- 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