dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Mon, Sep 21, 2009 at 09:02:04PM +0100, Garth N. Wells wrote:
>
>
> Anders Logg wrote:
> > Johan and I have set up a benchmark for parallel speedup in
> >
> >   bench/fem/speedup
> >
> > Here are some preliminary results:
> >
> >   Speedup  |  Assemble  Assemble + solve
> >   --------------------------------------
> >   1        |         1                 1
> >   2        |    1.4351            4.0785
> >   4        |    2.3763            6.9076
> >   8        |    3.7458            9.4648
> >   16       |    6.3143            19.369
> >   32       |    7.6207            33.699
> >
> > These numbers look a bit strange, especially the superlinear speedup
> > for assemble + solve. There might be a bug somewhere in the benchmark
> > code.
> >
> > Anyway, we have some preliminary results that at least show some kind
> > of speedup.
> >
> > It would be interesting to hear some comments on what kind of numbers
> > we should expect to get from Matt and others.
> >
> > The benchmark is for assembling and solving Poisson on a 64 x 64 x 64
> > mesh using PETSc/MUMPS. Partitioning time is not included in the
> > numbers.
>
> Something else - does the assembly timing include computation of the DofMap?

No, that happens before at the creation of the FunctionSpace. This is
just the call to assemble.

--
Anders

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