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"Too many open files" in test runs on Python 3.3 #3315
Description
The OSX testing juggernaut rolls on. For tests on Python 3.3.5, I am getting multiple (> 400) test errors related to "Too many open files":
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ERROR: matplotlib.tests.test_mathtext.test_mathtext_cm_37.test
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Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/site-packages/nose/case.py", line 198, in runTest
self.test(*self.arg)
File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/site-packages/matplotlib/testing/decorators.py", line 51, in failer
result = f(*args, **kwargs)
File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/site-packages/matplotlib/testing/decorators.py", line 183, in do_test
figure.savefig(actual_fname, **self._savefig_kwarg)
File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/site-packages/matplotlib/figure.py", line 1470, in savefig
self.canvas.print_figure(*args, **kwargs)
File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/site-packages/matplotlib/backend_bases.py", line 2192, in print_figure
**kwargs)
File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/site-packages/matplotlib/backends/backend_pdf.py", line 2475, in print_pdf
File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/site-packages/matplotlib/backends/backend_pdf.py", line 525, in close
File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/site-packages/matplotlib/backends/backend_pdf.py", line 628, in writeFonts
File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/site-packages/matplotlib/backends/backend_pdf.py", line 798, in embedTTF
OSError: [Errno 24] Too many open files: '/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/site-packages/matplotlib/mpl-data/fonts/ttf/cmr10.ttf'
See:
- https://s3.amazonaws.com/archive.travis-ci.org/jobs/30947790/log.txt
- https://s3.amazonaws.com/archive.travis-ci.org/jobs/30947803/log.txt
I wasn't getting this failure for the multiprocess tests on previous Python 3.3 runs (which will have been testing a different commit on the 1.4.x branch):
https://s3.amazonaws.com/archive.travis-ci.org/jobs/30794971/log.txt
I assume this is because the multiprocess tests were each only using a smaller number of open files per process.
Any ideas why this should be happening for Python 3.3 specifically, not 2.7 or 3.4?
Activity
tacaswell commented on Aug 17, 2014
@matthew-brett Is there anything we need to do mpl side about this?
matthew-brett commented on Aug 21, 2014
Sorry - I am not sure of the cause of the problem, or why it is fixed
in Python 3.4 - so I don't know whether there is a real mpl problem or
not :). Is there anything simple I can do to track down what is
happening?
Reduce number of font files opened
Reduce number of font files opened
Reduce number of font files opened
Reduce number of font files opened