In a reply to question 36225 at
https://ask.sagemath.org/question/36225/memory-leak-with-modular-symbols/
(my reply was deleted by the system so you cannot read it) I offered
to try to help by asking here how to do somthign I don't know how to
do.
When you do
sage: E = EllipticCurve('11a1')
sage: M = E.modular_symbol()
an instance of class ModularSymbolECLIB is created (as defined in
sage.schemes.elliptic_curves.ell_modular_symbols) which in turn
creates an instance of ECModularSymbol (as defined in sage/libs/eclib)
which in turn creates an ainstance of a C++ class in eclib which is a
C++ library. Currently there is no way the memory that uses up can be
released. I know that C++ classes have destructors which get called
when the objects go out of scope; presumably there is something
similar in python / cython? What would we need to do to get the
destructor called?
Currently a loop such as
DB = CremonaDatabase()
for N in range(1,10000):
Cs = DB.isogeny_classes(N)
for C in Cs:
E=EllipticCurve(C[0][0])
phi=E.modular_symbol()
uses up more and more memory even though after each run through the
innermost loop there is no data left in scope.
John
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