[Paraview-developers] Parallel mesh reading

[Andy Bauer]

The difficulty in parallel with unstructured grids is that it's tough to
determine which cells need which points so for unstructured grids that are
stored in a single file, all points often time are either read in on
process 0 and broadcast out or each process reads in all points. Neither of
these methods scale well. The advantage of multiple files here is that in
each file the points are just the ones that are needed by the cells in that
file. You could do a similar thing with blocks of points and cells in a
single file. The main point here is that you need to think about an
algorithm that has each process read in only (or nearly only) the points it
needs in order to read in the cells in gets assigned. Also, consider
whether or not you want your reader to be able to read in ghost cells as
well. It's not a requirement for parallel readers but certain filter work
better with ghost cells.

On Tue, Aug 23, 2016 at 9:51 AM, sumeet kumar <sumeet.kumar507 at gmail.com>
wrote:

> I have unstructured grids
>
> On Tue, Aug 23, 2016 at 6:50 AM, Andy Bauer <andy.bauer at kitware.com>
> wrote:
>
>> What kind of grid is it? It's much easier to read in topologically
>> regular grids in parallel than unstructured grids.
>>
>> On Tue, Aug 23, 2016 at 9:47 AM, sumeet kumar <sumeet.kumar507 at gmail.com>
>> wrote:
>>
>>> Hello all,
>>>
>>> Let's have a very large mesh in GB's/TB's that too in one file. How can
>>> I read that file in parallel  with any arbitrary number of processors.
>>>
>>> How can I divide my mesh in N independent pieces? that each processor
>>> would read. Is there any instructions for doing such kind of think in
>>> para-view.
>>>
>>> Is reading multiple files in parallel more efficient or reading one file
>>> in parallel more efficient in para-view. In either of these how I should
>>> design my output to be most efficient to be read by ParaView in Parallel.
>>>
>>>
>>> Sumeet
>>>
>>> --
>>>
>>> Sumeet Kumar Sinha
>>> Graduate Student
>>> Phone: (+1)  <%28%2B91%29%209910516219>5306018271
>>> Website : http://www.sumeetksinha.com/
>>>
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>>
>
>
> --
>
> Sumeet Kumar Sinha
> Graduate Student
> Phone: (+1)  <%28%2B91%29%209910516219>5306018271
> Website : http://www.sumeetksinha.com/
>
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