Question about the options.num_threads

[Yan Cui]

Hi Ceres Team,

I have done some developments based on a new Ceres version (2.0), however, when I switch to run on an old version of Ceres (1.14 I believe), I see this warning quite a lot

"Neither OpenMP nor TBB support is compiled into this binary; only options.num_threads = 1 is supported. Switching to single thread node"

which I did not see in the new version when I set options.num_threads = 4. The environments are pretty much the same, and I would like to learn is this expected? i.e., does the new version already include those support and able to compute in parallel by default? 

Thank you very much,

Yan

[Sameer Agarwal]

The new version has threading using c++11 threads which is not available in old versions of Ceres.

Sameer 

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