dolfin team mailing list archive

[Johan Hake <johan.hake@xxxxxxxxx>]

On Wednesday September 28 2011 16:57:09 Garth N. Wells wrote:
> On 29 Sep 2011, at 00:46, Johan Hake <johan.hake@xxxxxxxxx> wrote:
> > Nice!
> > 
> > Does this work for writing a Function to file in parallel too, like
> > saving a solution during a run?
> 
> Yes.

Nice!

Johan

> Garth
> 
> > Johan
> > 
> > On Wednesday September 28 2011 16:34:57 Garth N. Wells wrote:
> >> After a long absence, Function i/o to file has made a come back. It
> >> was particularly necessary to support running code in parallel that
> >> reads in data for Functions (such as the advection-diffusion demo). We
> >> have more demos running in parallel now, and it's now possible to
> >> restart parallel computations reliably (and even on a different number
> >> of processes).
> >> 
> >> When sending a Function to an XML file, there is an entry for each
> >> vector (dof) entry, e.g.
> >> 
> >>    <dof global_index="2" value="0" cell_index="3" local_dof_index="0" />
> >> 
> >> 'global_index' is the vector index, 'value' is the entry value,
> >> 'cell_index' is a cell that the dof belongs to and 'local_dof_index'
> >> is the local dof number relative to the given cell. With this
> >> information, it's possible to read in and use function data
> >> independently of the new dof map. If anyone has suggestions or
> >> objections to this format, speak up now.
> >> 
> >> When reading in a Function, the Function must have a FunctionSpace,
> >> and the vector must already have been sized (since the partitioning of
> >> the vector in parallel will depend on the mesh partition).
> >> 
> >> Garth
> >> 
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