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[Garth Wells <gnw20@xxxxxxxxx>]

Looks like it is a SWIG bug, which can be worked around by removing the
SWIG flag '-dirvtable', see the change

http://bazaar.launchpad.net/~dolfin-core/dolfin/main/revision/4511

** Changed in: dolfin
   Importance: Undecided => High

** Changed in: dolfin
    Milestone: None => 0.9.7

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

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 "----"