I've been looking into the test_expand() memory leak (e.g., with
PYTHONHASHSEED=2538990509). Apparently, the problem is not with cse,
but with expand. If you put a print statement in expr.py like
diff --git a/sympy/core/expr.py b/sympy/core/expr.py
index 2a2ae16..38bffcf 100644
--- a/sympy/core/expr.py
+++ b/sympy/core/expr.py
@@ -2645,6 +2645,7 @@ def expand(self, deep=True, modulus=None,
power_base=True, power_exp=True, \
return n.expand(deep=deep, modulus=modulus, **hints)/d
for hint, use_hint in hints.iteritems():
if use_hint:
+ print 'expanding %s' % hint
func = getattr(expr, '_eval_expand_'+hint, None)
if func is not None:
expr = func(deep=deep, **hints)
and run the tests with PYTHONHASHSEED=2538990509 (64-bit), you'll get
...
expanding mul
expanding log
expanding basic
expanding power_exp
expanding power_base
expanding multinomial
expanding mul
expanding log
expanding basic
expanding power_exp
expanding power_base
expanding multinomial
expanding mul
expanding log
expanding basic
expanding power_exp
expanding power_base
expanding multinomial
expanding mul
expanding log
expanding basic
expanding power_exp
expanding power_base
expanding multinomial
expanding mul
expanding log
expanding basic
expanding power_exp
expanding power_base
...
and so on, infinitely. Clearly somewhere is not handling the base
case of recursion correctly, but solving this more generally should
take care of the problem as well.
Aaron Meurer
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