memory leak from sympy - embedded python

[Denis Akhiyarov]

I'm calling iteratively functions from embedded python. The functions share few common sympy expressions from a closure above them on which the function do subs() and solve(). The environment variable SYMPY_USE_CACHE does not work for me. I have to manually clean the cache. Even with that I still get the memory leak which I confirmed on Python side with empty def function(*args): return 0. Investigation with guppy showed that most of the memory consists of:

[Set of 266944 <mixed> objects. Total size = 72143480 bytes.

 Index     Size   %   Cumulative  %   Brief

     0     1684   0.0      1684   0.0 sympy.core.assumptions.StdFactKB: 0x701a750

     1      532   0.0      2216   0.0 sympy.core.assumptions.StdFactKB: 0x701a620

     2      532   0.0      2748   0.0 sympy.core.assumptions.StdFactKB: 0x701a9b0

     3      532   0.0      3280   0.0 sympy.core.assumptions.StdFactKB: 0x701aa48

     4      532   0.0      3812   0.0 sympy.core.assumptions.StdFactKB: 0x701aae0

     5      532   0.0      4344   0.0 sympy.core.assumptions.StdFactKB: 0x701ad40

     6      532   0.0      4876   0.0 sympy.core.assumptions.StdFactKB: 0x7057a48

     7      532   0.0      5408   0.0 sympy.core.assumptions.StdFactKB: 0x7057ca8

     8      532   0.0      5940   0.0 sympy.core.assumptions.StdFactKB: 0x7057d40

     9      532   0.0      6472   0.0 sympy.core.assumptions.StdFactKB: 0x7057dd8

How can I clean these assumptions?

guppy==0.1.10

numpy==1.8.1

sympy==0.7.5

Python 2.7.7 (default, Jun  1 2014, 14:17:13) [MSC v.1500 32 bit (Intel)] on win32

[Ondřej Čertík]

Hi Denis,

We just merged this PR:

https://github.com/sympy/sympy/pull/7464

So now sympy's memory usage by default should not grow beyond the
limited size of the cache.

Ondrej

[Denis Akhiyarov]

Hi Ondrej,

When can I expect sympy 0.7.6 or next release?

Thanks,

Denis

[Aaron Meurer]

We don't have a release timeline. We can really do one whenever. There
are some blocking issues on the milestone
https://github.com/sympy/sympy/issues?milestone=8&state=open, although
I'm guessing that most of those can be pushed.

Aaron Meurer

On Thu, Jul 17, 2014 at 7:20 AM, Denis Akhiyarov

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