On Friday, February 9, 2018 at 11:03:11 AM UTC, Marco Caliari wrote:
>
> Hi, the following script
>
> def test(m,c,precision):
> M = 3*m
> RRR = RealField(prec = precision)
> coef02 = [RRR(1/i) for i in [1..M+1]]
> g = coef02[M]
> for i in [M-1..2,step=-1]:
> g = x*g+coef02[i]
> ME = 32
> disk = [exp (2*pi.n(precision)*I*i/ME) for i in range(ME)]
> epsilon1 = max([abs(g(x=z)) for z in disk])
> return
> m = 40
> for c in [1/2..10,step=1/2]:
> for ell in [1..10]:
> test(m,c,165)
>
> Indeed, comparing the objects on the heap that weren't there before the
loop I find:

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[(<type 'builtin_function_or_method'>, 1),
(<type 'sage.rings.rational.Rational'>, 1),
(<type 'instancemethod'>, 1),
(<type 'set'>, 1),
(<type 'dict'>, 1),
(<type 'tuple'>, 3),
(<type 'list'>, 3),
(<type 'frame'>, 3),
(<type 'weakref'>, 28),
(<type 'sage.rings.real_mpfi.RealIntervalFieldElement'>, 6200),
(<type 'sage.rings.real_mpfr.RealNumber'>, 29999),
(<type 'sage.rings.complex_number.ComplexNumber'>, 1457000)]
The real numbers mostly seem to be approximations to pi. Using
objgraph.show_backrefs I'm not getting anything useful. We're definitely
leaking but I wasn't able to identify a cache that's keeping references. Is
that any change that we're doing something wrong with an INCREF/DECREF ?
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