#15498: Memory leak in ideal arithmetic
-------------------------------+------------------------
Reporter: ppurka | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.1
Component: algebra | Resolution:
Keywords: memory leak | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
-------------------------------+------------------------
Comment (by nbruin):
Memory use is still increasing with 5.13.xx, but I don't see a particular
object count go up in the way one would expect with a straight memory
leak. This could just be fragmentation or some other difficult-to-control
issue. The code I tried was:
{{{
sage: sage: import gc
sage: sage: from collections import Counter
sage: sage: R=QQ['x']
sage: sage: R.ideal(1)==R.ideal(1)
True
sage: sage: gc.collect()
514
sage: sage: pre = gc.get_objects()
sage: sage: for i in range(100000): _ = R.ideal(1) == R.ideal(1)
sage: sage: gc.collect()
0
sage: sage: post = gc.get_objects()
sage: sage: pre_id=set( id(p) for p in pre )
sage: sage: new=[p for p in post if id(p) not in pre_id]
sage: sage: C=Counter(type(p) for p in new)
sage: sage: len(new)
51
sage: sage: len(pre)-len(post)+len(new)
6
sage: C
Counter({<type 'list'>: 12, <type 'tuple'>: 8, <type 'dict'>: 7, <type
'frame'>: 6, <type 'instancemethod'>: 4, <type 'weakref'>: 3, <class
'_ast.Name'>: 2, <class '_ast.Interactive'>: 1, <type 'dictionary-
itemiterator'>: 1, <class '_ast.Assign'>: 1, <type 'listiterator'>: 1,
<class '_ast.Module'>: 1, <class '_ast.Attribute'>: 1, <type
'builtin_function_or_method'>: 1, <type 'enumerate'>: 1, <class
'_ast.Call'>: 1})
}}}
Hopefully the memory use flattens out after a while. It may well be that
there was a serious leak for this example before that is now fixed. It may
also be that we really are leaking, but not in python memory. Perhaps
libsingular?
--
Ticket URL: <http://trac.sagemath.org/ticket/15498#comment:1>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/sage-trac.
For more options, visit https://groups.google.com/groups/opt_out.
