dolfin team mailing list archive

["Alessio Quaglino" <alessio@xxxxxx>]

> Alessio Quaglino wrote:
>>> Alessio Quaglino wrote:
>>>> With "the mesh remains constant" is meant that the vertices cannot
>>>> move
>>>> or
>>>> that there should not be any connectivity change?
>>>>
>>> No connectivity changes.
>>
>> I see that in
>>
>> void Assembler::assemble(GenericTensor& A, const Form& form,
>>                          bool reset_tensor)
>> {
>>   assemble(A, form.form(), form.coefficients(), 0, 0, 0);
>> }
>>
>> reset_tensor is not used. Is this wanted? The initGlobalTensor takes 90%
>> of my runtime (I think it wasn't like this before the last release).
>>
>
>
> That's exactly why it's there. If the matrix has already been
> initialised, then there is not need to re-initialise. This will
> typically be useful for nonlinear problems.

Sorry my question was probably ill-posed. I mean that the matrix is
re-initialized even if I set the flag reset_tensor to false because it is
not passed to the inner assemble().

Alessio


> If initialising the matrix is requiring 90% of your runtime, you're
> probably doing something strange. Initialising the matrix does now take
> more time, with the trade-off that assembly is now much faster and less
> memory is required.
>
> Garth
>
>
>> Alessio
>>
>>
>>> Garth
>>>
>>>> Alessio
>>>>
>>>>
>>>>> One or more new changesets pushed to the primary dolfin repository.
>>>>> A short summary of the last three changesets is included below.
>>>>>
>>>>> changeset:   3358:fe232f61370532bd51b0f77df3fdd6aeaf5aa82c
>>>>> tag:         tip
>>>>> user:        "Anders Logg <logg at simula.no>"
>>>>> date:        Tue Aug 28 14:50:21 2007 +0200
>>>>> files:       src/kernel/fem/Assembler.cpp src/kernel/fem/assemble.cpp
>>>>> src/kernel/fem/dolfin/Assembler.h src/kernel/pde/LinearPDE.cpp
>>>>> src/kernel/pde/NonlinearPDE.cpp
>>>>> description:
>>>>> Add mesh to constructor of Assembler. Reuse of dof maps requires
>>>>> that the mesh remains constant.
>>>>>
>>>>>
>>>>> changeset:   3357:4ad8f4efd1d6c87e9d6dc82d85e2d8f3e4facff0
>>>>> user:        "Anders Logg <logg at simula.no>"
>>>>> date:        Tue Aug 28 14:26:43 2007 +0200
>>>>> files:       src/kernel/function/UserFunction.cpp
>>>>> src/kernel/function/dolfin/Function.h
>>>>> src/kernel/function/dolfin/UserFunction.h
>>>>> description:
>>>>> Make rank() and dim() virtual (overloadable by user).
>>>>>
>>>>>
>>>>> changeset:   3356:24c98268945163d11ab3b45f08f6015c25b4546c
>>>>> user:        "Anders Logg <logg at simula.no>"
>>>>> date:        Tue Aug 28 13:38:22 2007 +0200
>>>>> files:       src/demo/pde/poisson/python/demo.py
>>>>> description:
>>>>> test
>>>>>
>>>>> ----------------------------------------------------------------------
>>>>> For more details, visit http://www.fenics.org/hg/dolfin
>>>>>
>>>>>
>>>>
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>>>>
>>>
>>>
>>
>>
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>
>
>