Comment #6 on issue 3222 by supp...@mooncoder.com: Memory problems with the cache
http://code.google.com/p/sympy/issues/detail?id=3222

Documentation is one thing, but there is something more important. The cache mechanism can actually hurt sympy because for some people, "sympy crashes" or "sympy is not able to solve my problem". All this because of the cache.

This issue is not limited to "big" and "complicated" problems, but it also concerns simple problems where sympy functions are called many times. Any kind of an adaptive mechanism like the ones suggested in previous posts would be highly recommended so that a (hidden) part of sympy never hurts sympy.

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