#11158: get_image_dimensions very slow after 1 call
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Reporter: kua | Owner: nobody
Status: new | Milestone: 1.1
Component: Core framework | Version: SVN
Resolution: | Keywords: get_image_dimensions,
field, save, slow
Stage: Accepted | Has_patch: 1
Needs_docs: 0 | Needs_tests: 0
Needs_better_patch: 1 |
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Changes (by rvanlaar):
* milestone: => 1.1
Comment:
I wrote a testcase for it, but I don't know how to generate a image with
PIL.
Putting a 40 MB file in the svn wouldn't be a good a idea.
{{{
from time import time
from django.core.files.images import get_image_dimensions
from django.core.files.uploadedfile import File
f = File(open('/tmp/some_multi_megabyte_file.jpg')
t1 = time()
get_image_dimensions(f)
t2 = time()
run1_time = t2 - t1
t3 = time()
get_image_dimensions(f)
t4 = time()
run2_time = t4 - t3
# The second run time should be in the same order of the first run.
# So we check if the second runtime is not more then one order of
# magnitude off.
assert(run2_time < 10 * run1_time)
}}}
A quick solution is using:
{{{
get_image_dimensions(f.name)
}}}
A better way to fix this is having an exposed classfunction
to call get_image_dimensions, since django.core.files.image.!ImageFile
already has a self._dimensions_cache.
--
Ticket URL: <http://code.djangoproject.com/ticket/11158#comment:8>
Django <http://code.djangoproject.com/>
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