1/13/2023 0 Comments Imagemagick apiWhy do the people who programm ImageMagick not solve it and make a single-thread option. ![]() I am so lost with that thing! □ It seems none of the things I do can solve the problem. (I have virtual hosts, but they are in the directory sites-enabled) This wrapper script is called FCGIWrapper, and we can find the path to it in the corresponding nf ” I do not understand the last part of this tutorial: “wich is usually called from an intermediate script set in an Apache virtualhost. SetResourceLimit(6,1) – did not change anything on my System. phpInfo() shows me it is still using the old version. does not use “convert”, it uses “magick” now…so I do not know how to change that. How do I install a new ImageMagick Version without multi-core? How do I tell PHP to use this new version? The new Version 7.x.x. It takes around 30-60 seconds for one image to convert from PDF to JPG, with some filters an re-sizing. I do not want to change all my php scripts now. What is the solution today (2016) with that ImageMagick problem on virtual Servers ? I am lost with anything here and would appreciate any help. ~# cat /var/www/cgi-bin/cgi_wrapper/cgi_wrapper This wrapper script is called FCGIWrapper, and we can find the path to it in the corresponding nf file: įCGIWrapper /var/www/cgi-bin/cgi_wrapper/cgi_wrapper. In this case the MAGICK_THREAD_LIMIT variable would be defined in the runtime environment of /usr/bin/php5-cgi command, wich is usually called from an intermediate script set in an Apache virtualhost. PHP from command line env MAGICK_THREAD_LIMIT=1 php test.php If conversion is performed using the system command as in “system(‘convert -resize 800×600 file1.png file2.png’) ”, we’ll be calling the convert command the same way as in the previous section, in which case that solution is of course valid. I’m always referring to the case of using the ImageMagick native functions in our PHP code, like “$im = new Imagick(‘file.png’) ” or “$im->readImageBlob($svgin) ”. 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. Forcing ImageMagick to use only one of the available cores present in the system to perform the conversion.Recompiling ImageMagick with the –disable-openmp parameter to not use the multiprocessor feature.Upgrading to a new version of ImageMagick or an earlier one stable enough that there is no bug causing this problem. ![]() If the above command displays the “Features: OpenMP” line, then everything fits and our problem of excessive CPU load can be fixed in three ways: 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.
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