dolfin team mailing list archive

[Johan Hake <johan.hake@xxxxxxxxx>]

Thanks for the precise bug report!

While i forgot to update instant, hiding the real leak a while I finally 
nailed it. We needed to delete a void pointer to a shared_ptr<Foo*>. I do not 
think SWIG allocated any extra memory, we just forgot to reduce a ref count on 
a shared_ptr. 

Johan

On Friday 12 February 2010 16:39:59 Garth N. Wells wrote:
> Johan Hake wrote:
> > On Friday 12 February 2010 13:06:00 Garth N. Wells wrote:
> >> Garth N. Wells wrote:
> >>> I've tracked a leak in the Python interface down to the line:
> >>>
> >>>   # Initialize base class
> >>>   cpp.Form.__init__(self, self._compiled_form, self.function_spaces,
> >>> self.coefficients)
> >>>
> >>> on line 46 of form.py. If I do
> >>>
> >>>   cpp.Form.__init__(self, self._compiled_form, self.function_spaces,
> >>> [])
> >>>
> >>> then there is no observable leak. Any ideas? I checked dolfin::Form it
> >>> it looks ok. I even commented out all code in the dolfin::Form
> >>> constructor to be sure.
> >>
> >> Could the problem be in the SWIG wrapper for std::vector? The line
> >>
> >>     res = SWIG_ConvertPtrAndOwn(py_item, &itemp,
> >> $descriptor(dolfin::TYPE *), 0, &newmem);
> >>
> >> looks suspicious. Johan?
> >
> > I can have a look at it. I see that you have reported a bug.
> 
> Yes, I dug deep enough that I could identify the problem precisely
> enough for a bug report, but I couldn't fix it.
> 
> Garth
> 
> > Johan
> >
> >> Garth
> >>
> >>> Below is the script that I've been testing with.
> >>>
> >>> Garth
> >>>
> >>>
> >>> from dolfin import *
> >>> parameters["form_compiler"]["cpp_optimize"] = True
> >>> parameters["form_compiler"]["optimize"] = True
> >>> mesh = UnitSquare(16, 16)
> >>> for t in xrange(20000):
> >>>     for level in xrange(100):
> >>>         V  = FunctionSpace(mesh, "CG", 1)
> >>>         v  = TestFunction(V)
> >>>         u  = Function(V)
> >>>         u0 = Function(V)
> >>>         L = v*(u-u0)*dx
> >>>         b = assemble(L)
> >>>     print "----"
> >>>
> >>>
> >>>
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> >>
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