On Friday, December 15, 2017 at 12:16:04 PM UTC, vdelecroix wrote: > > You can fill your memory with something simpler > > sage: l = range(10**9) > > As far as I can see it has nothing to do with Sage or loops. In Python2 > the range functions constructs a list. And in the above example, the > list is huge. >
indeed. In order to avoid this, use xrange() instead of range() (well, this is not going to make your code Python3-proof, but range() in Python3 is what xrange() is in Python3; see e.g. https://stackoverflow.com/a/15015199/557937 on how to make it portable) > > Vincent > > On 15/12/2017 12:06, Marco Caselli wrote: > > Hello there, > > I am currently having trouble in memory management, I wrote a code that > was > > not supposed to store anything but actually it was using a massive > amount > > of memory. At a first glance, I thought it was related to some function > in > > my code, such as factor() for polynomials in a multivariate ring over a > > finite field. I dug a bit deeper and the problem seems even at a lower > > level: > > > > def check_memory(k): > >> a=get_memory_usage() > >> silly_function(k) > >> return get_memory_usage()-a > >> > >> def silly_function(k): > >> for i in range(10^k): > >> 2+2 > > > > > > Notice that silly_function does not store neither return anything, so > the > > memory usage should be zero. > > check_memory(9) returned 23446.37109375, this amount is in MB, so those > are > > 23GB. This information is consistent with the data from top. At a second > > run it returned just 972.62109375, which is still a lot. > > > -- 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 https://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
