Comment #12 on issue 3427 by hacm...@gmail.com: sympy imports matplotlib on
start-up
http://code.google.com/p/sympy/issues/detail?id=3427
In order to get an objective test, it is probably a good idea to look at
the import time after clearing the disk cache. Under Linux, this can be
done (as root) by running the following:
# sync && echo 3 > /proc/sys/vm/drop_caches
Doing this shows that PR 2101 does not dramatically reduce import time.
Also, it shows that matplotlib's import is about 20% of SymPy's import
time*. A significant portion is probably the importing of all of SymPy's
various modules. Try the following before and after importing sympy:
import sys; print sorted(sys.modules)
Obviously, the only reliable way to check this is by profiling, but a very
simple test that imports numpy, matplotlib, Cython, mpl_toolkits and PIL
only adds up to about 40% of SymPy's import time (after disk cache flush).
So, I'm not sure that the subject of this ticket is quite accurate. Overall
import time may be a problem, but it is not clear that matplotlib is the
sole culprit. That being said, the time to import the standard SymPy in
Ubuntu 12.04 (0.7.1.rc1) is about half of that for the latest master
(0.7.2-git)
* When I say that matplotlib's import time is is X% of sympy's import time,
I am comparing the time of a script that only imports matplotlib with one
that import sympy. Both are run directly after clearing the disk cache.
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