Legacy ImageMagick Discussions Archive

Hi!

I had ImageMagick 6.6.3-9 2010-08-22 Q16 running fine on my Win 2003 server with Apache 2.20 and PHP 5.xx, but on my new virtualized Win 2008 server the same ImageMagick, or some never-ones work, but awfully slow. Same PDF takes about 30 seconds to convert to thumb-image, as on my earlier server the same on took about 5 secs.! Is there anything to be done? I read in google, that the openmp-support might be the problem on virtualized servers, but how to get a non-openmp package on windows? Or is the performance issue something else? Thanks!

More likely you are having threading problems with two many threads, or not enough virtual CPU's.

See architure document for thread handling options.
http://imagemagick.org/script/architecture.php#threads

Thank you for your answer. I tried increasing the amount of virtual CPU's to 4, but the load for httpd.exe was 25 during the generating-process and the time used in generating decreased only 3 seconds, to 27. And normally the time has been about 5-10 secs. So it's not the CPU-issue. Anything else to be done? Any suggestions are really welcome and appreciated!

BTW, I came to conclusion, that it is the OpenMP that might be causing this slowlyness. Is there a way to disable OpenMP on Windows, or are there any pre-compiled installer-packages for Windows without OpenMP?

Thanks!

Set the threads resource limit to 1 to run ImageMagick algorithms in only one thread. For example, use -limit thread 1 on the command line.