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Date: Mon, 5 Jan 2015 08:47:47 -0500
Message-ID: <CAK8GPyANgimJ=_Y_XKDDJNVguCX61pkqu_G0Ya+hZbBVROgPFw@mail.gmail.com>
From: Aaron Boxer <boxerab@gmail.com>
To: TIFF mailing list <tiff@lists.maptools.org>
Subject: [Tiff] Fwd:  Fast TIFF Reading on Windows
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---------- 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.

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<div dir=3D"ltr"><br><div class=3D"gmail_quote">---------- Forwarded messag=
e ----------<br>From: <b class=3D"gmail_sendername">Aaron Boxer</b> <span d=
ir=3D"ltr">&lt;<a href=3D"mailto:boxerab@gmail.com">boxerab@gmail.com</a>&g=
t;</span><br>Date: Mon, Jan 5, 2015 at 8:47 AM<br>Subject: Re: [Tiff] Fast =
TIFF Reading on Windows<br>To: John Cupitt &lt;<a href=3D"mailto:jcupitt@gm=
ail.com">jcupitt@gmail.com</a>&gt;<br><br><br><div dir=3D"ltr"><br><div cla=
ss=3D"gmail_extra"><br><div class=3D"gmail_quote"><div><div class=3D"h5">On=
 Mon, Jan 5, 2015 at 4:53 AM,  <span dir=3D"ltr">&lt;<a href=3D"mailto:jcup=
itt@gmail.com" target=3D"_blank">jcupitt@gmail.com</a>&gt;</span> wrote:<br=
><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1=
px #ccc solid;padding-left:1ex"><span>On 5 January 2015 at 03:36, Aaron Box=
er &lt;<a href=3D"mailto:boxerab@gmail.com" target=3D"_blank">boxerab@gmail=
.com</a>&gt; wrote:<br>
&gt; 2) TIFFOpenfile with mode &quot;ru&quot; i.e. disabling memory mapping=
, was 3 times<br>
&gt; slower than with default flag &quot;r&quot;<br>
&gt;<br>
&gt; So, my conclusion is that memory mapping is the way to go for performa=
nce.<br>
<br>
</span>That&#39;s interesting. I tried on linux and the situation is roughl=
y<br>
reversed: with the disc cache empty, mmap() is about half the speed of<br>
vanilla read() (for me). This is for a a simple scan of a 300mb strip<br>
tiff on an HDD. I&#39;m always surprised how different the filesystems<br>
are.<br>
<br></blockquote><div><br></div></div></div><div>Very interesting. I am cur=
ious to see what happens on Linux with SSD. =C2=A0 <br></div></div></div></=
div>
</div><br></div>

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