[Paraview] parallel processing in volume rendering and Merge Blocks filter ...

[Andy Bauer]

Hi Ufuk,

The Merge Blocks filter will work locally on each process and shouldn't
move any of the data between MPI processes since it's a trivially parallel
operation. When doing volume rendering of unstructured grids (the output
dataset type of the merge blocks filter) with Ice-T in parallel, there will
be data moved around in order to simplify and reduce the parallel
communication by constructing convex partitions.

I don't know how NVIDIA's Index plugin works in parallel but my guess would
be that it also wants convex partitions.

Cheers,
Andy


On Thu, Sep 21, 2017 at 3:14 AM, Ufuk Utku Turuncoglu (BE) <
u.utku.turuncoglu at be.itu.edu.tr> wrote:

> Hi Andy,
>
> Thanks for the clarification. One minor question, after applying Merge
> Blocks is it still processing in serial mode or can i use MPI to improve
> the performance? By the way, i am also using NVIDIA Index plugin. I think
> that it supports parallel rendering but again not for multi block dataset.
> Right?
>
> Regards,
>
> --ufuk
>
>
> On 20/09/2017 22:12, Andy Bauer wrote:
>
> Hi Ufuk,
>
> ParaView doesn't currently support volume rendering of multiblock
> datasets, even in serial, so using the Merge Blocks filter is probably the
> best way to do any volume rendering of your dataset.
>
> Cheers,
> Andy
>
> On Wed, Sep 20, 2017 at 2:45 PM, Ufuk Turuncoglu <
> u.utku.turuncoglu at be.itu.edu.tr> wrote:
>
>> Hi,
>>
>> I am trying to perform volume rendering (VR) using multi-block +
>> multi-piece dataset. In this case, the data file has single block that
>> contains multiple piece (created by MPI parallel simulation code) and it is
>> in structured grid. When I try to use volume rendering with raw data, it
>> creates empty output but if I use Merge Block filter before using volume
>> rendering, it works without any problem. So, I have to use Merge Blocks
>> to perform VR. At this point, I just wonder that is it typical behaviour
>> of ParaView for multi-block + multi-piece datasets? Is it still possible
>> to perform VR in parallel if I had a multiple core (such as enabling Auto
>> MPI from the settings)? If not is there any way to re-structure the data to
>> perform more efficient rendering?
>>
>> Best Regards,
>>
>> --ufuk
>>
>>
>>
>>
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