I think sage's memory management is making progress: examples of getting
obvious leaking are getting more convoluted. I ran into the following one.
With the code
import gc
def t(N,start=0):
P=PolynomialRing(QQ,name='x')
x=P.gen(0)
L=[NumberField(x^2+1,name="a%d"%start)]
for i in range(start,N-1):
R=PolynomialRing(L[i],name="X")
Li=NumberField(R.gen(0)^2+L[i].gen(0),name="a%d"%(i+1))
L.append(Li)
return L
def Nobjects(t):
return len([a for a in gc.get_objects() if isinstance(a,t)])
I get:
sage: T=type(t(2)[1])
sage: Nobjects(T)
1
sage: L=t(5)
sage: Nobjects(T)
4
sage: del L
sage: Nobjects(T)
4
sage: gc.collect()
1633
sage: Nobjects(T)
3
sage: gc.collect()
0
sage: Nobjects(T)
3
i.e., it seems that as soon as a field is used as a base field for further
extensions, it's nailed in memory.
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