dolfin team mailing list archive

["Garth N. Wells" <gnw20@xxxxxxxxx>]

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.

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
> > >
> > > _______________________________________________
> > > DOLFIN-dev mailing list
> > > DOLFIN-dev at fenics.org
> > > http://www.fenics.org/mailman/listinfo/dolfin-dev
>
>
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