The first command tells you how much space is required for the transformation.
magick -limit memory 0 -limit map 0 input.jpg -resize 400 png:output Theoretically you can measure the minimum RSS ImageMagick requires by running: $ /usr/bin/time -f %M. There's a theoretical and a practical answer to this question: within the cgroup) to prevent going to DISK(3).Įmpirically we've found CACHE(2) adds a 100% time penaly, whereas DISK adds a 2500% time penalty, compared to storing in RSS(1).
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ImageMagick does not knowingly allocate memory to CACHE(2): this type of allocation occurs when ImageMagick allocates to DISK(3), but the OS transparently allocates to CACHE(2) when it sees enough free RAM is available (e.g. This cannot be lowered with -limit (see "Does the -limit flag work?" below). Note 2: There is a minimum RSS ImageMagick requires for a given transformation, and is a function of the input image and the transformation. Note 1: RSS is essentially a fancy word for RAM. if 90MB of space is required, ImageMagick may allocate 30MB in RSS, 30MB in CACHE and 30MB in DISK. ImageMagick will spill into a subsequent tranche after filling the current one, e.g. ImageMagick allocates space across tranches, but will try to keep within the upper tranche(s) if possible. When you run an ImageMagick command, a certain amount of space is required to run it, which is measured in bytes. ImageMagick abstracts over memory, so rather than thinking about memory, think about space instead. Think of "space required" instead of "memory required".Therefore, any constants and coefficients you derive for your memory estimation formula should come from the same system you'll be performing your image transformations on. Memory usage varies wildly between systems (even when using the exact same ImageMagick binary).Q8/16) to arrive at memory estimates – are often very different from the real memory usage you will observe on your system. In our experience, the theoretical calculations you might find on StackOverflow – which use image size, image format and QuantumDepths (i.e. There are too many variables involved to produce a simple universal calculation for estimating ImageMagick's memory usage: the operating system, processor architecture, hardware emulation and ImageMagick version all factor into how much memory ImageMagick consumes. Estimating ImageMagick's memory usage is a dark art.
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However, if you need all the features of ImageMagick, then keep reading: we will show you how to train a model to accurately estimate the memory usage of an ImageMagick command on the system it'll be running on. The memory footprint of vipsthumbnail is so much lower that you may be able to run it without worrying too much about its memory usage. Estimating ImageMagick memory usage: it's not fun, it's not clever, but if you really need to do it, here's a method that works for us.įirstly, if all you want to do is resize images, we recommend you use vipsthumbnail instead of ImageMagick.
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