#12313: Fix yet another memory leak caused by caching of coercion data
--------------------------------------------------+-------------------------
Reporter: SimonKing | Owner:
Type: defect | Status:
needs_review
Priority: major | Milestone: sage-5.3
Component: memleak | Resolution:
Keywords: coercion weak dictionary | Work issues:
Report Upstream: N/A | Reviewers: Simon King,
Jean-Pierre Flori, John Perry
Authors: Simon King, Jean-Pierre Flori | Merged in:
Dependencies: #11521, #11599, #12969, #12215 | Stopgaps:
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Comment (by SimonKing):
I let the `Gap._start` method print a stack when there is a problem that
leads to the "this is harmless" message.
After finishing the tests, there is a `RuntimeError` "Unable to start
gap", and the stack is
{{{
(<frame object at 0x117d940>,
'/mnt/local/king/SAGE/prereleases/sage-5.3.beta2/local/lib/python/site-
packages/sage/interfaces/gap.py', 964, '_start', [' for bla in
inspect.stack():\n'], 0)
(<frame object at 0x117d6f0>,
'/mnt/local/king/SAGE/prereleases/sage-5.3.beta2/local/lib/python/site-
packages/sage/interfaces/gap.py', 536, '_eval_line', ['
self._start()\n'], 0)
(<frame object at 0x4a027e0>,
'/mnt/local/king/SAGE/prereleases/sage-5.3.beta2/local/lib/python/site-
packages/sage/interfaces/gap.py', 1092, 'set', [' out =
self._eval_line(cmd, allow_use_file=True)\n'], 0)
(<frame object at 0x42d1d50>,
'/mnt/local/king/SAGE/prereleases/sage-5.3.beta2/local/lib/python/site-
packages/sage/interfaces/interface.py', 385, '_create', ['
self.set(name, value)\n'], 0)
(<frame object at 0x4a07970>,
'/mnt/local/king/SAGE/prereleases/sage-5.3.beta2/local/lib/python/site-
packages/sage/interfaces/expect.py', 1327, '__init__', ['
self._name = parent._create(value, name=name)\n'], 0)
(<frame object at 0x4d3b9e0>,
'/mnt/local/king/SAGE/prereleases/sage-5.3.beta2/local/lib/python/site-
packages/sage/interfaces/interface.py', 195, '__call__', ['
return cls(self, x, name=name)\n'], 0)
(<frame object at 0x49ec260>,
'/mnt/local/king/SAGE/prereleases/sage-5.3.beta2/local/lib/python/site-
packages/sage/groups/perm_gps/permgroup.py', 562, '__cmp__', ['
gSelf = self._gap_()\n'], 0)
(<frame object at 0x1408240>,
'/mnt/local/king/SAGE/prereleases/sage-5.3.beta2/local/lib/python2.7/weakref.py',
51, 'remove', [' del self.data[wr.key]\n'], 0)
}}}
So, apparently one has to look at the `__cmp__` method in permgroup.py and
make sure that it works when gap can not start.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12313#comment:196>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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