#15367: Empty lists while creating parents
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Reporter: roed | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-5.13
Component: memleak | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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This is crazy:
{{{
sage: import gc
sage: A = at_least
sage: pre = gc.get_objects()
sage: K = Qp(7,2)
sage: post = gc.get_objects()
sage: len(post) - len(pre)
747
}}}
Much of that is empty lists:
{{{
sage: M = []
sage: for a in post:
....: for b in pre:
....: if a is b:
....: break
....: else:
....: M.append(a)
sage: from collections import defaultdict
sage: types = defaultdict(int)
sage: for a in K.M:
....: types[type(a)] += 1
sage: print '\n'.join([str(a) + ' ' + str(types[a]) for a in types.keys()
if types[a] > 1])
<type 'list'> 554
<type 'tuple'> 57
<class 'weakref.KeyedRef'> 28
<type 'weakref'> 22
<type 'dict'> 18
<type 'sage.structure.coerce_dict.MonoDictEraser'> 10
<type 'sage.structure.coerce_dict.MonoDict'> 10
<type 'cell'> 8
<type 'instancemethod'> 6
<type 'frame'> 6
<type 'sage.structure.coerce_dict.TripleDict'> 5
<type 'sage.structure.coerce_dict.TripleDictEraser'> 5
<type 'function'> 4
<type 'staticmethod'> 4
<class 'sage.structure.dynamic_class.DynamicMetaclass'> 4
<class 'sage.rings.homset.RingHomset_generic_with_category'> 2
<class '_ast.Name'> 2
sage: listlens = defaultdict(int)
sage: for a in M:
....: if isinstance(a, list):
....: listlens[len(a)] += 1
sage: sage: sorted(listlens.items())
[(0, 525), (1, 9), (2, 2), (3, 2), (23, 10), (53, 5), (116583, 1)]
}}}
I'm not sure where these 525 empty lists are created, but it seems a bit
excessive.
It's not just p-adic fields:
{{{
sage: pre = gc.get_objects()
sage: K = QuadraticField(-11)
sage: post = gc.get_objects()
sage: len(post) - len(pre)
1152
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/15367>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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