Question #667700 on Yade changed:
https://answers.launchpad.net/yade/+question/667700

    Status: Open => Answered

Bruno Chareyre proposed the following answer:
>So when you have a 8 core cpu, you always get 16 threads.

Not "always". Only if hyperthreading is enabled (a BIOS setting on desktops). I 
don't know if some hpc would enable hyperthreading but clearly it is only 
detrimental to use it for intensive computing.
The choice is thus rather straighforward: the number of cores taken should be 
equal to the number of threads used.
Bruno

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