Hi Gabriel, On 2014-05-25, Gabriel Furstenheim Milerud <furstenh...@gmail.com> wrote: > There is a memory leak in the evaluation of multivariable polynomials: > > -C.<x,y,z>=GF(2)[] > -f=x^4+x*y^3+z^6 > > -get_memory_usage() > .....1014.47265625 > - for i in xrange(1000000): > a=f(1,0,0) > -get_memory_usage() > .....1052.47265625
Note that you first request the memory usage before assigning "a=f(1,0,0)". But to some extend, I can confirm an increase of memory usage (with Sage 6.2): sage: C.<x,y,z> = GF(2)[] sage: f = x^4+x*y^3+z^6 sage: a = f(1,0,0) sage: get_memory_usage() 176.08984375 sage: for i in xrange(1000000): ....: a = f(1,0,0) ....: sage: get_memory_usage() 198.08984375 sage: for i in xrange(1000000): ....: a = f(1,0,0) ....: sage: get_memory_usage() 222.08984375 We have an increase of 22-24 megabytes in 10^6 rounds, thus 23-25 byte per round. Actually I wonder how such a tiny leak is even possible! In any case, it should be fixed. > try: > K = x[0].parent() > except AttributeError: > K = self.parent().base_ring() > y = K(0) > for (m,c) in self.element().dict().iteritems(): > y += c*misc.mul([ x[i]**m[i] for i in range(n) if m[i] != 0]) > return y > > So in every loop a new ring K is created and saved No, K is already there, it is either x[0].parent() or self.parent().base_ring(). Actually it is K=GF(2), if I am not mistaken. Moreover, I don't think this branch of code is evaluated in your example. Anyway, thank you for the example! Best regards, Simon -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
