Thanks to both. I'll experiment with this. There's currently a ticket already marked Positive Review on this interface (#10256) but since that will have missed the 7.5 release it might make sense to add to that ticket. Not sure.
John On 9 January 2017 at 15:45, David Roe <roed...@gmail.com> wrote: > Python has a __dealloc__ method, which is called when the object is garbage > collected. You can find examples by search_src. > > On Jan 9, 2017 09:52, "John Cremona" <john.crem...@gmail.com> wrote: >> >> 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 >> >> -- >> You received this message because you are subscribed to the Google Groups >> "sage-devel" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to sage-devel+unsubscr...@googlegroups.com. >> To post to this group, send email to sage-devel@googlegroups.com. >> Visit this group at https://groups.google.com/group/sage-devel. >> For more options, visit https://groups.google.com/d/optout. > > -- > You received this message because you are subscribed to the Google Groups > "sage-devel" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sage-devel+unsubscr...@googlegroups.com. > To post to this group, send email to sage-devel@googlegroups.com. > Visit this group at https://groups.google.com/group/sage-devel. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
