Legacy ImageMagick Discussions Archive

Hi,

I did some development in a local environment. I put it online two days ago and was a bit disapointed by the time I need to resize image. So I was looking for all the tips I could find to resize my images faster.

First things I did, was to configure IM in 8-bits mode instead of 16-bits. Then I read about the libjpeg-turbo which is supposed to be 2x4 times faster to decode/encode JPG files. My only problem is that I don't know how to install it.

Here's what I did so far:

Install libjpeg-turbo :

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# wget 'http://sourceforge.net/projects/libjpeg-turbo/files/1.3.0/libjpeg-turbo-official_1.3.0_amd64.deb/download' -O libjpeg-turbo_1.3.0_amd64.deb
# dpkg -i libjpeg-turbo_1.3.0_amd64.deb
Selecting previously deselected package libjpeg-turbo.
(Reading database ... 25967 files and directories currently installed.)
Unpacking libjpeg-turbo (from libjpeg-turbo_1.0.1_i386.deb) ...
Setting up libjpeg-turbo (1.0.1-20100909) ...

Install ImageMagick using these commands :

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./configure --with-modules --with-perl --disable-static  --with-quantum-depth=8
make
sudo make install

There were no errors when during the installation, everything went fine.

I didn't notice any change. How could I confirm that libjpeg-turbo is correctly install and set up?

Thank you in advance for any help.
Arnaud

Hi there,

still wondering where my problem is. On the other hand, I try to follow other tips:

Using a VPS server, i try to limit the number of thread used by Imagemagick. I'm supposed to have only 2 cores availables and by default, the imagemagick configuration is set up to 32. I try to limit the number of thread to 1, then 2, without any valuable changes.
http://superuser.com/questions/343648/l ... ng-limited

And i read this
http://www.imagemagick.org/Usage/api/#speed

But still, resizing this image (http://www.gratuit-en-ligne.com/telecha ... hatons.jpg) to 100x100pixels, take around 0.9 and 2 seconds.

My server isn't doing anything else besides this (the website is under development, so i'm the only one using it). Here's the VPS config :
1250 MB of RAM
2x 1.25 Ghz

Are this performance normal or is there something wrong with my server/imagemagick installation?

It may be worth checking that "convert -version" shows OpenMP.

On my Windows laptop, 2 cores, with IM v6.8.6-0 Q16, the command ...

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convert image-wallpaper-animaux-chatons.jpg -resize 100x100 j.jpg

... takes typically 0.25s elapsed.

When I limit the threads to 1 ...

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convert -limit threads 1 image-wallpaper-animaux-chatons.jpg -resize 100x100 j.jpg

... it takes typically 0.08s elapsed.

(The slow time with 2 threads is a known problem under Windows, and apparently will be fixed. See viewtopic.php?f=1&t=23986 )

Thank you for your answer.

Here's my version of IM:

#convert -version
Version: ImageMagick 6.8.6-9 2013-09-01 Q8 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2013 ImageMagick Studio LLC
Features: DPC OpenMP
Delegates: jpeg

My result in local was similar, way, way faster than on the server. Before incriminate the quality of the host, I would like to check if i do everything right.

You say, "My server isn't doing anything else besides this".

I would check how true that really is. Also check how much CPU time your process is taking. (I've forgotten the Unix tools for this.)

Sure, I'll give you more information about that.

I'm not an expert in linux, so I tried a top command :

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top - 11:58:10 up 10 days,  5:52,  2 users,  load average: 0.03, 0.02, 0.00
Tasks:  39 total,   1 running,  38 sleeping,   0 stopped,   0 zombie
Cpu(s):  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:   1310720k total,   665072k used,   645648k free,        0k buffers
Swap:   327680k total,        0k used,   327680k free,   534480k cached

Other information coming from webmin :

Processor information AMD Opteron(TM) Processor 6274 , 2 cores
CPU load averages 0.00 (1 min) 0.00 (5 mins) 0.00 (15 mins)
CPU usage 1% user, 0% kernel, 0% IO, 99% idle
Real memory 128.52 MB used, 1.25 GB total
Virtual memory 0 bytes used, 320 MB total
Local disk space 1.61 GB used, 63 GB total

I'm having trouble to find how to give you the CPU usage of the convert process. I will continue to look for a way to do it and post it here when a got it!

Is there more information that would be relevant?

Thank you for helping me!

Is there more information that would be relevant?

I don't know. I'm not an expert at Unix, servers or IM configuration. I'm just asking the obvious question: Are the CPUs fully utilised?

Maybe it's also worth using "-bench" in your statement, but I don't know anything about it.

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