ImageMagick stores image pixels to memory if the memory allocation request
is honored and the request is less than the memory limits.  Type

  identify -list resource

to see the limits.  You can modify the limits with the -limit command line
option (.e.g. -limit memory 2048).

If memory is denied, ImageMagick caches the image pixels to disk and attempts
to memory map it for efficient I/O.  If the memory map limit is exceeded or the
memory map request is denied by the system, all pixel cache I/O is to/from
disk.  If the disk limit is exceeded, ImageMagick exits.
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