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January 2015

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2015.01.01 17:12 "Re: Fast TIFF Reading on Windows", by Bob Friesenhahn
2015.01.01 17:27 "Re: Fast TIFF Reading on Windows", by <jcupitt@gmail.com>
2015.01.01 20:24 "Re: Fast TIFF Reading on Windows", by Aaron Boxer
2015.01.01 20:20 "Re: Fast TIFF Reading on Windows", by Aaron Boxer
2015.01.03 05:24 "Re: Fast TIFF Reading on Windows", by Edward Lam
2015.01.05 03:36 "Re: Fast TIFF Reading on Windows", by Aaron Boxer
2015.01.05 03:39 "Re: Fast TIFF Reading on Windows", by Aaron Boxer
2015.01.05 04:49 "Re: Fast TIFF Reading on Windows", by Bob Friesenhahn
2015.01.05 09:53 "Re: Fast TIFF Reading on Windows", by <jcupitt@gmail.com>
2015.01.05 13:47 "Fwd: Fast TIFF Reading on Windows", by Aaron Boxer
2015.01.05 13:47 "Fwd: Fast TIFF Reading on Windows", by Aaron Boxer
2015.01.05 14:07 "Re: Fast TIFF Reading on Windows", by Aaron Boxer
2015.01.05 15:05 "Re: Fast TIFF Reading on Windows", by Bob Friesenhahn
2015.01.05 19:38 "Re: Fast TIFF Reading on Windows", by Aaron Boxer
2015.01.07 10:53 "Re: Fast TIFF Reading on Windows", by Roger Leigh
2015.01.07 15:26 "Re: Fast TIFF Reading on Windows", by Bob Friesenhahn
2015.01.05 14:03 "Re: Fast TIFF Reading on Windows", by Edward Lam
2015.01.05 14:08 "Re: Fast TIFF Reading on Windows", by Aaron Boxer
2015.01.05 17:57 "Re: Fast TIFF Reading on Windows", by Edward Lam

2015.01.05 13:47 "Fwd: Fast TIFF Reading on Windows", by Aaron Boxer

---------- Forwarded message ----------
From: Aaron Boxer <boxerab@gmail.com>
Date: Mon, Jan 5, 2015 at 8:47 AM
Subject: Re: [Tiff] Fast TIFF Reading on Windows
To: John Cupitt <jcupitt@gmail.com>




On Mon, Jan 5, 2015 at 4:53 AM, <jcupitt@gmail.com> wrote:

> On 5 January 2015 at 03:36, Aaron Boxer <boxerab@gmail.com> wrote:
> > 2) 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.
>
>
Very interesting. I am curious to see what happens on Linux with SSD.