[vtkusers] vtkMultiProcessController - GetNumberOfProcesses is only 1

[David E DeMarle]

On Thu, Mar 5, 2015 at 10:32 AM, Armin Wehrfritz <dkxls23 at gmail.com> wrote:

> The two options are:
> MPIEXEC_MAX_NUMPROCS
> VTK_MPI_MAX_NUMPROCS
>
> I also have been baffled by these two options, especially since the
> documentation string says in both cases:
> "Maximum number of processors available to run MPI applications."
>
> So, are they both only used by ctest?
>
>
Yep.

I agree that the documentation strings are bad. Patches to fix are more
than welcome.


-Armin
>
>
>
> On 03/05/2015 05:19 PM, David E DeMarle wrote:
>
>>
>> On Thu, Mar 5, 2015 at 8:33 AM, redmod79 <michael.j.redmond at gmail.com
>> <mailto:michael.j.redmond at gmail.com>> wrote:
>>
>>     MPIEXEC_MAX_NUMPROCS
>>
>>
>> This flag specifies the number of processors that ctest is allowed to
>> use in regression tests. I am guessing the other flag is
>> MPIEXEC_NUMPROC_FLAG. That is the string that ctest uses to tell mpi how
>> many processors to use. It is "-np" in many mpi implementations. Neither
>> affect anything other than the regression tests.
>>
>> I suspect you are just forgetting to run pvtkpython under mpi.
>> For example:
>> bin/pvtkpython
>> /Source/VTK/devel/VTK/Examples/ParallelProcessing/
>> MPI/Python/ParallelCone.py
>>
>> numProcs is 1
>>
>> mpiexec -n 2 bin/pvtkpython
>> /Source/VTK/devel/VTK/Examples/ParallelProcessing/
>> MPI/Python/ParallelCone.py
>>
>> numProcs is 2
>>
>> mpiexec -n 16 bin/pvtkpython
>> /Source/VTK/devel/VTK/Examples/ParallelProcessing/
>> MPI/Python/ParallelCone.py
>>
>> numProcs is 16
>>
>>
>> David E DeMarle
>> Kitware, Inc.
>> R&D Engineer
>> 21 Corporate Drive
>> Clifton Park, NY 12065-8662
>> Phone: 518-881-4909 <tel:518-881-4909>
>>
>>
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