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

[Sujin Philip]

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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