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List:       imagemagick-developer
Subject:    [magick-developers] Re: Slow Image Flip
From:       "Kevin Myers" <KevinMyers () austin ! rr ! com>
Date:       2003-01-11 4:01:13
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On a related note, mogrify seems to be leaving behind some very large (1GB+)
.tmp files after it finishes processing the commands described below.  While
I can understand possibly needing these files to provide working space
during execution of a command, shouldn't they be deleted when the command
completes???  They use up vast quantities of space on my hard drive very
quickly unless I delete them occasionally after mogrify has completed.

s/KAM


----- Original Message -----
From: "Kevin Myers" <KevinMyers@austin.rr.com>
To: "ImageMagick Users" <magick-users@imagemagick.org>
Cc: "ImageMagick Developers" <magick-developers@imagemagick.org>
Sent: Friday, January 10, 2003 9:52 PM
Subject: Slow Image Flip


> Hello,
>
> I'm attempting to use ImageMagick to rotate some very large TIFF images
180
> degrees.  These images are line art (1 bit grayscale), roughly 2000 pixels
> wide by 100000 pixels long, or 200M pixels total.
>
> I've tried two different approaches:  One using -rotate 180, and the other
> using -flip and -flop.  Either approach has been extremely slow, requiring
> around 20 minutes or more for completion.
>
> My machine is a 2.2GHz P4 with 1.5GB of RAM and ultra DMA 133 IDE hard
> drives, running Windows 2000.  While the rotation is progressing, I have
> noticed that almost all of the elapsed time is due to disk I/O, while my
CPU
> is mostly sitting idle at around 5% load, and only 225MB of my RAM is
being
> utilized, including that for a few other windows that I have open but am
not
> actively using (several Explorer windows, couple of notepad windows,
couple
> of command prompt windows, task manager).
>
> Can anyone offer any suggestions that might help to speed things up?  I've
> run without using -limit at all, and also tried -limit memory 1024 -limit
> map 1536, and either way it doesn't seem to make much difference.  :-(
>
> Thanks in advance for any ideas.
>
> s/KAM
>
>

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