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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