ffc team mailing list archive

[Johannes Ring <johannr@xxxxxxxxx>]

On Tue, Jun 22, 2010 at 11:40 AM, Kristian Oelgaard
<k.b.oelgaard@xxxxxxxxx> wrote:
> On 21 June 2010 23:16, Kent Andre <kent-and@xxxxxxxxx> wrote:
>>
>> Strange. I used dorsal to compile the dev versions of the various
>> packages. Dolfin, ffc, and sfc are only a few days old.
>
> I removed fenics-syfi and cloned a new one, then I got a little
> further but crashed on swiginac, I removed the python-swiginac 1.5.1-2
> which I got through synaptic and had Dorsal install swiginac 1.5.1
> (thank you Dorsal!) after which the demo.py file ran without
> complaints.

What was the problem with python-swiginac? I'm maintaining the package
in Debian so I would be interested to know about any problems with it
(also in Ubuntu).

Johannes

> Kristian
>
>> But do you have any suggestions for how to optimize the FFC generated
>> code ? I have used quadrature here, tensor representation is not good
>> in this application.
>>
>> Kent
>>
>>
>> On Mon, 2010-06-21 at 23:05 +0200, Kristian Oelgaard wrote:
>>> I tried to run the code against the dev versions of FEniCS and got the
>>> following error after successfully finishing the FFC part:
>>>
>>> Traceback (most recent call last):
>>>   File "demo.py", line 15, in <module>
>>>     V = FunctionSpace(mesh, "CG", 1)
>>>   File "/home/oelgaard/software/fenics/dolfin/local/lib/python2.6/site-packages/dolfin/function/functionspace.py",
>>> line 230, in __init__
>>>     FunctionSpaceBase.__init__(self, mesh, element)
>>>   File "/home/oelgaard/software/fenics/dolfin/local/lib/python2.6/site-packages/dolfin/function/functionspace.py",
>>> line 44, in __init__
>>>     ufc_element, ufc_dofmap = jit(self._ufl_element)
>>>   File "/home/oelgaard/software/fenics/dolfin/local/lib/python2.6/site-packages/dolfin/compilemodules/jit.py",
>>> line 44, in mpi_jit
>>>     return local_jit(*args, **kwargs)
>>>   File "/home/oelgaard/software/fenics/dolfin/local/lib/python2.6/site-packages/dolfin/compilemodules/jit.py",
>>> line 87, in jit
>>>     p = form_compiler.default_parameters()
>>> AttributeError: 'module' object has no attribute 'default_parameters'
>>>
>>> Kristian
>>>
>>> On 21 June 2010 15:42,  <kent-and@xxxxxxxxx> wrote:
>>> >
>>> > Hi, just portet SFC to dolfin-dev and ufl-dev and made some simple
>>> > comparisons with FFC. I
>>> > don't know exactly how representative these are, but I thought I'd try to
>>> > compare
>>> > them for fun.
>>> >
>>> > I have used the following code:
>>> >
>>> > from dolfin import *
>>> > import time
>>> >
>>> > for compiler in ["ffc", "sfc"]:
>>> >
>>> >    for N in [200, 400, 800]:
>>> >
>>> >        parameters["form_compiler"]["name"]=compiler
>>> >        if compiler == "ffc":
>>> >            parameters["form_compiler"]["optimize"] = True
>>> >            parameters ["form_compiler"]["cpp_optimize"] = True
>>> >
>>> >        mesh = UnitSquare(N, N)
>>> >        V = FunctionSpace(mesh, "CG", 1)
>>> >
>>> >        P=6
>>> >        U = Function(V)
>>> >        energy = U**6*(U*U + inner(grad(U), grad(U)))*dx
>>> >
>>> >        v = TestFunction(V)
>>> >        u = TrialFunction(V)
>>> >
>>> >        F = derivative(energy, U, v)
>>> >        J = derivative(F, U, u)
>>> >
>>> >        print ""
>>> >        print "First time"
>>> >        print ""
>>> >        t0 = time.time()
>>> >        A = assemble(J)
>>> >        t1 = time.time()
>>> >        print "First time for ", compiler, " was ", t1 - t0
>>> >
>>> >        print ""
>>> >        print "Second time"
>>> >        print ""
>>> >        t0 = time.time()
>>> >        A = assemble(J)
>>> >        t1 = time.time()
>>> >
>>> >        print "Second time for ", compiler, " was ", t1 - t0
>>> >
>>> >
>>> > With these options SFC is about 3 times faster than FFC. How should I
>>> > optimize FFC ?
>>> >
>>> > Kent
>>> >
>>> >
>>> >
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>>> >
>>
>>
>>
>
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