[vtk-developers] Checking SMP backend at runtime/compiletime?

[David Gobbi]

Hi Sujin,

That sounds good.  Even if the choice of backend is transparent as far as
using vtkSMPTools is concerned, it's very nice to be able to report which
backend was configured.

 - David

On Tue, Feb 9, 2016 at 8:46 AM, Sujin Philip <sujin.philip at kitware.com>
wrote:

> Hi Sean,
>
> vtkSMPTools is a framework for implementing multi-threaded algorithms in
> VTK. It support several backends. The main ones are TBB and OpenMP. There
> are Kaapi and Simple backends which are no longer supported and will be
> removed soon. Finally, the default backend is Sequential which is just a
> single threaded implementation of the framework. After removal of the Kaapi
> and Simple backend, if you need multithreading support on Clang you would
> have to use TBB. The Sequential backend will be supported on all platforms.
>
> David,
>
> I have talked with Berk about this and I will soon make a change to have a
> compile time macro to check for SMP backend type. I will also finally
> remove Kaapi and Simple backend as part of this change.
>
> Thanks
> Sujin
>
>
> On Tue, Feb 9, 2016 at 10:28 AM, Sean McBride <sean at rogue-research.com>
> wrote:
>
>> On Tue, 9 Feb 2016 09:13:48 -0500, Sujin Philip said:
>>
>> >Why would you want to continue using vtkMultiThreader when Sequential or
>> >Simple is used? In fact, now that there is an openmp backend, we should
>> be
>> >removing simple. It was only there to ease debugging since tbb had very
>> >complex back-traces. Openmp back-traces are much more readable. Do you
>> want
>> >the algorithm to be multithreaded even when Sequential is used?
>>
>> I don't know the APIs you're discussing, so this comment is coming mostly
>> from ignorance, but: are you talking about requiring OpenMP to build VTK?
>> Clang has only very recently added OpenMP support, and IIRC it's not
>> complete.  Also, last I checked, Apple's fork of clang doesn't support it
>> at all.
>>
>> Cheers,
>>
>> --
>> ____________________________________________________________
>> Sean McBride, B. Eng                 sean at rogue-research.com
>> Rogue Research                        www.rogue-research.com
>> Mac Software Developer              Montréal, Québec, Canada
>>
>>
>>
>
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