Re: 6.5.5 much slower than 6.3.6 (getpid problems)

Hello duc,

I checked, and by default OpenMP is not being installed with the
freebsd port, so in both cases OpenMP is OFF.

w11# convert -version
Version: ImageMagick 6.5.5-7 2009-09-23 Q16 http://www.imagemagick.org
w11# time convert t1.jpg t2.jpg
0.724u 0.171s 0:03.85 23.1%     8+1099k 0+231io 0pf+0w
http://www.privatepaste.com/33SYs2zAJw

w14# convert -version
Version: ImageMagick 6.3.6 04/03/08 Q16 http://www.imagemagick.org
w14# time convert t1.jpg t2.jpg
0.683u 0.078s 0:00.86 87.2%     5+1217k 0+230io 0pf+0w
http://www.privatepaste.com/8e1SsnIZM5




Wednesday, September 23, 2009, 10:59:25 PM, you wrote:

>> Should I go ahead and try your idea?

> Only if you want to identify the performance bottleneck.  We need to quantify
> it and if its shows to be a problem in ImageMagick, we will fix it.

> We need timing for a particular ImageMagick command for ImageMagick 6.5.5,
> ImageMagick 6.5.6-4 (with OpenMP), and ImageMagick 6.5.6-4 (without OpenMP).
> You can confirm OpenMP support from the version:

>   -> convert -version
>   Version: ImageMagick 6.5.6-5 2009-09-23 Q16 OpenMP http://www.imagemagick.org
>   Copyright: Copyright (C) 1999-2009 ImageMagick Studio LLC

> If 6.5.6-4 proves to be slower than 6.5.5 even with OpenMP disabled, we will
> investigate further and look for and fix the performance bottleneck.  If the
> slow-down is caused by OpenMP we suspect a bug in libgomp (the OpenMP library).

> Thanks,
> The ImageMagick Development Team



Arkadiy Kulev                         mailto:[email protected]
+7 495 5070602
Moscow, Russia