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If rather than using ImageMagick from the command line we do through libraries available for different programming languages like PHP, the above solution will not work, so we’ll have to add the MAGICK_THREAD_LIMIT=1 variable to the PHP interpreter runtime environment in order to PHP properly load it when calling ImageMagick functions. Setting the MAGICK_THREAD_LIMIT variable in PHP

Then open a new command shell, since the current one will not load such environment variable until we log into the system again. PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" So edit the /etc/environment file and add the line MAGICK_THREAD_LIMIT=1 as shown below: ~# cat /etc/environment This variable should be set to 1 and be available in the runtime environment of the convert command. The way to force ImageMagick to use a single processor or core when performing an image conversion is using the environment variable MAGICK_THREAD_LIMIT. Limit the number of cores using MAGICK_THREAD_LIMIT It’s only a workaround, a “trick” allowing us to use ImageMagick without falling into the CPU freezing mentioned earlier in this article. Note that the procedure shown below does not really solve the problem. Thus, compiling ImageMagick again it not a viable choice. The latter is perhaps the best solution to our problem because probably we will have already tried to update ImageMagick to another version, and in many cases we will have ImageMagick installed as a package from one of the Linux distributions available.

Then check if your version of ImageMagick is enabled with OpenMP feature: ~# convert -versionĬopyright: Copyright (C) 1999-2009 ImageMagick Studio LLC So the first thing to do to know if the solution proposed in this post is valid for us, is to check if the system has multiple processors or multiple cores: How to know how many cores and processors has a Linux box.