#10548: ModularSymbols_clear_cache() not clearing everything?
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Reporter: mderickx | Owner: craigcitro
Type: defect | Status: new
Priority: major | Milestone: sage-4.6.2
Component: modular forms | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Description changed by mderickx:
Old description:
> When I was doing some computations on modular forms, I noticed the
> following strange memory usage behaviour which. After the first two
> iterations it seems like there is a memory leak. But strangely enough it
> stops leaking at the third iteration.
>
> {{{
> sage: import gc
> sage: gc.collect()
> 54
> sage: get_memory_usage()
> 819.7578125
> sage: for i in xrange(10):
> ....: ModularSymbols(Gamma1(97),sign=1)
> ....: ModularSymbols_clear_cache()
> ....: gc.collect()
> ....: get_memory_usage()
> ....:
> Modular Symbols space of dimension 440 for Gamma_1(97) of weight 2 with
> sign 1 and over Rational Field
> 0
> 842.58984375
> Modular Symbols space of dimension 440 for Gamma_1(97) of weight 2 with
> sign 1 and over Rational Field
> 0
> 860.08203125
> Modular Symbols space of dimension 440 for Gamma_1(97) of weight 2 with
> sign 1 and over Rational Field
> 37640
> 876.63671875
> Modular Symbols space of dimension 440 for Gamma_1(97) of weight 2 with
> sign 1 and over Rational Field
> 37640
> 878.2421875
> Modular Symbols space of dimension 440 for Gamma_1(97) of weight 2 with
> sign 1 and over Rational Field
> 37640
> 878.76953125
> Modular Symbols space of dimension 440 for Gamma_1(97) of weight 2 with
> sign 1 and over Rational Field
> 37640
> 880.2421875
> Modular Symbols space of dimension 440 for Gamma_1(97) of weight 2 with
> sign 1 and over Rational Field
> 37640
> 880.2421875
> Modular Symbols space of dimension 440 for Gamma_1(97) of weight 2 with
> sign 1 and over Rational Field
> 37640
> 880.2421875
> Modular Symbols space of dimension 440 for Gamma_1(97) of weight 2 with
> sign 1 and over Rational Field
> 37640
> 880.2421875
> Modular Symbols space of dimension 440 for Gamma_1(97) of weight 2 with
> sign 1 and over Rational Field
> 37640
> 880.2421875
> }}}
>
> It would be nice to be able to create modular symbols without needing to
> restart sage to get all your memory back.
New description:
When I was doing some computations on modular forms, I noticed that the
ModularSymbols_clear_cache() was not doing what it claims to do.
{{{
sage: import gc
sage: ModularSymbols(Gamma1(29),sign=1)
Modular Symbols space of dimension 49 for Gamma_1(29) of weight 2 with
sign 1 and over Rational Field
sage: ModularSymbols_clear_cache()
sage: gc.collect()
57
sage: [x for x in gc.get_objects() if
isinstance(x,sage.modular.modsym.ambient.ModularSymbolsAmbient_wtk_g1)]
[Modular Symbols space of dimension 49 for Gamma_1(29) of weight 2 with
sign 1 and over Rational Field]
sage:
}}}
So even after garbage collection the modular symbols element is still in
memory.
--
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10548#comment:3>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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