dolfin team mailing list archive

[Johan Hake <hake.dev@xxxxxxxxx>]

On Saturday 13 February 2010 13:08:05 Garth Wells wrote:
> Public bug reported:
> 
> The below code leads to a memory leak (I see a leak over about 2MB over
> 90s). The leak is related to the Expression. If I comment out the call
> to
> 
>     eval(Array<double>&, const Array<double>&);
> 
> from
> 
>   dolfin::GenericFunction::evaluate(double*, const double*, const
> ufc::cell) const
> 
> I don't detect a leak.

I can confirm this bug. Not sure it is in the typemap, as it should also have 
shown up if we moved f  = MyExpression(degree=1) outside of the loop.

Johan
 
> ------
> 
> from dolfin import *
> parameters["form_compiler"]["cpp_optimize"] = True
> parameters["form_compiler"]["optimize"] = True
> 
> class MyExpression(Expression):
>     def eval(self, values, x):
>         if x[0] < DOLFIN_EPS:
>             values[0] =  1.0
> 
> mesh = UnitSquare(32, 32)
> for t in xrange(20000):
>     for level in xrange(100):
>         V  = FunctionSpace(mesh, "CG", 1)
>         v  = TestFunction(V)
>         u  = Function(V)
>         u0 = Function(V)
>         f  = MyExpression(degree=1)
>         L = v*(u-u0)*dx + v*f*ds
>         b = assemble(L)
>     print "----"
> 
> ** Affects: dolfin
>      Importance: Undecided
>          Status: New
>

-- 
Memory leak in Python Expression interface
https://bugs.launchpad.net/bugs/521507
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Status in DOLFIN: New

Bug description:
The below code leads to a memory leak (I see a leak over about 2MB over 90s). The leak is related to the Expression. If I comment out the call to

    eval(Array<double>&, const Array<double>&);

from 

  dolfin::GenericFunction::evaluate(double*, const double*, const ufc::cell) const

I don't detect a leak.

------

from dolfin import *
parameters["form_compiler"]["cpp_optimize"] = True
parameters["form_compiler"]["optimize"] = True

class MyExpression(Expression):
    def eval(self, values, x):
        if x[0] < DOLFIN_EPS:
            values[0] =  1.0

mesh = UnitSquare(32, 32)
for t in xrange(20000):
    for level in xrange(100):
        V  = FunctionSpace(mesh, "CG", 1)
        v  = TestFunction(V)
        u  = Function(V)
        u0 = Function(V)
        f  = MyExpression(degree=1)
        L = v*(u-u0)*dx + v*f*ds
        b = assemble(L)
    print "----"