Sorry, I copied the same example twice. The second one (with large leak)
should be
R.<X,Y> = ZZ[]
P = (X+Y)^120*Y^100
mem1 = get_memory_usage()
for i in range(100):
Q = P(X+Y,Y)
mem2 = get_memory_usage()
print mem2 - mem1
tirsdag den 12. februar 2019 kl. 16.28.57 UTC+3 skrev Nadim Rustom:
>
> Hi,
>
> I have recently encountered some issues using multivariate polynomials in
> Sage. The most serious is a memory leak, which occurs in the following
> examples:
>
> The following shows a small memory leak:
> R.<X,Y> = ZZ[]
>
>
> P = (X+Y)^120*Y^100
>
>
> mem1 = get_memory_usage()
> for i in range(100):
> Q = P(X,Y)
> mem2 = get_memory_usage()
>
>
> print mem2 - mem1
>
>
> whereas the following gives a much bigger memory leak:
>
> R.<X,Y> = ZZ[]
>
>
> P = (X+Y)^120*Y^100
>
>
> mem1 = get_memory_usage()
> for i in range(100):
> Q = P(X,Y)
> mem2 = get_memory_usage()
>
>
> print mem2 - mem1
>
> I tried this on Sage 7.4, Sage 8.5, and on the Sage 8.6 CoCalc server, all
> with similar results.
>
> Additionally, I noticed that operations with multivariate polynomials are
> way faster on Sage 7.4 than on Sage 8.*. Is there any work around for this
> problem? I tried to search in the open tickets, the closest thing I could
> find is this:
>
> https://trac.sagemath.org/ticket/13447
>
> Could this be what is causing these issues?
>
> Thanks in advance.
>
> Best,
> Nadim.
>
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