dolfin team mailing list archive

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

On 23 Oct 2011, at 21:51, Anders Logg <logg@xxxxxxxxx> wrote:

> On Sun, Oct 23, 2011 at 01:46:55PM -0700, Johan Hake wrote:
>> That depends. With a mesh I get some 50% decrease, and dependent on the values
>> in a vector I can get much more.
> 
> ok, a bit more than I expected but not a factor 10.
> 
>> I also found out that when a mesh is saved it is saved with _all_ its computed
>> connectivities. This can create rediculous large files. This was why I first
>> start looking into this. Not sure this is a feature or a bug. But I guess we
>> do not need to store more than the cell connectivities?
> 
> I'm not sure. If a mesh has a certain connectivity, then it's likely
> that connectivity is needed for something and will be needed again
> when you read it back. So it might be worth storing it (since the
> computation of it takes some time).
> 

The mesh connectivity is a serious bottleneck in 3D and in parallel. Speeding this up should probably be changed from a blueprint to a bug. 

Garth


> Perhaps you can add a parameter value to choose whether to store the
> extra connectivity?
> 
> --
> Anders
> 
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