[vtkusers] Different behavior of vtkXMLPUnstructuredGridWriter in VTK 7.1

[Bill Lorensen]

Andy,

Isn't there a way to handle the issue in a backward compatible way?
Seems like this user was surprised and a fix to his code was not
obvious.

Bill


On Tue, Dec 6, 2016 at 12:11 PM, Andy Bauer <andy.bauer at kitware.com> wrote:
> Hi,
>
> You'll want to enable VTK_Group_MPI (i.e. -DVTK_Group_MPI:BOOL=ON).
> Technically the "p" in the pvtu writer really corresponds to piece and not
> necessarily parallel. The pieces do map well to SIMD parallelism though.
>
> Best,
> Andy
>
> On Tue, Dec 6, 2016 at 12:06 PM, John Peterson <jwpeterson at gmail.com> wrote:
>>
>>
>>
>> On Tue, Dec 6, 2016 at 9:12 AM, Andy Bauer <andy.bauer at kitware.com> wrote:
>>>
>>> Hi John,
>>>
>>> The issue is indeed due to changes that I mentioned before (i.e. only
>>> data sets that have data get written out and the .pvtu file is adjusted
>>> accordingly). With this change though interprocess communication is required
>>> which is done the the vtkMultiProcessController::GetGlobalController()
>>> object which essentially acts as MPI_COMM_WORLD within VTK. You need to
>>> create a vtkMPIController which derives from vtkMultiProcessController. See
>>> the attached files for how that is done. This should also be backwards
>>> compatible but if it isn't, please let us know.
>>
>>
>> Thanks for your help.
>>
>> It looks like the VTK I built from source apparently does not have MPI
>> enabled (neither vtkMPIController.h nor libvtkParallelMPI-7.1.dylib is
>> present in my installation) as it was never required for our code prior to
>> VTK-7.1. Since I'm very much of a cmake novice, do you know what flag I
>> would pass to cmake when building VTK to turn this on?  My guess is
>> something like:
>>
>> -DModule_vtkParallelMPI:BOOL=ON
>>
>> ?
>>
>> --
>> John
>
>
>
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