TBB in Ceres

[Sameer Agarwal]

Yury Prokazov's patch adding Intel Thread Building Block support has been checked in.  

It will allow folks working with compiler toolchains without openmp support (clang I am looking at you) to use threading in ceres.

Currently enabling TBB also requires that you enable C++11.  We may look into, lowering these requirements to C++98. 

Please give it a whirl and let us know how it works for you.

Sameer

[Johannes Schönberger]

Hi Sameer,

This is great news. It would be great, if Ceres exported the CERES_NO_THREADS in the CMakeConfig.cmake, so that it is easier to detect when the number of threads can be set to > 1. Otherwise, Ceres logs warnings when the *num_threads options is > 1 but threading is not available.

Cheers,

Johannes

[Johannes Schönberger]

I am a little short on time at the moment, but I can try to submit a commit to address this in a few weeks, if nobody came around doing it in the meantime.

Cheers,
Johannes

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[Sameer Agarwal]

Johannes,  happy to have a CL whenever you can send it!

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