[Dune] Returning Geometries As Objects

[Martin Nolte]

Hi Jö,

the Geometry for SPGrid is actually stored in the Geometry object. The first 
naive implementation resulted in a slight performance penalty, but by now I'm 
down to 29.6s again. For the other grids: Yes, the geometry is stored as a 
reference.

Moreover, I don't think that this test would change a lot if the geometry were 
actually returned, because the geometry is only fetched once (finitevolume 
example from dune-grid-howto). But feel free to test it (I guess GeometryGrid 
would be a good candidate).

Best,

Martin

On 01/25/2012 01:36 PM, Jö Fahlke wrote:
> Am Wed, 25. Jan 2012, 09:49:01 +0100 schrieb Martin Nolte:
>> I also did some performance tests with gcc-4.6 (my usual explicit
>> finite volume scheme from the dune-grid-howto - slightly adapted for
>> performance measurements):
>>
>> Grid                          trunk (r7850)       branch (r7845)
>> SPGrid                         28.945s              31.448s
>> IdGrid<SPGrid>                  39.527s              35.848s
>>
>> YaspGrid                       43.394s              43.021s
>> IdGrid<YaspGrid>                80.378s              76.978s
>>
>> ALUCubeGrid                    247.227s            238.604s
>> IdGrid<ALUCubeGrid>             275.215s            273.532s
>>
>> SGrid                          225.179s            207.103s
>> IdGrid<SGrid>                   257.393s            217.859s
>
> Since StoreGeometryReference default to true, I assume these were all done
> with an implementation according to (b) (keep a reference to the
> implementation).  Are there any timings available with an implementation
> according to (a) (*store* the actual implementation in the geometry object)?
>
> Thanks,
> Jö.
>

-- 
Dr. Martin Nolte <nolte at mathematik.uni-freiburg.de>

Universität Freiburg                                   phone: +49-761-203-5630
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