Use tbb::affinity_partitioner according to documentation

[FabienPean-Virtonomy]

Following example https://oneapi-src.github.io/oneTBB/main/tbb_userguide/Bandwidth_and_Cache_Affinity_os.html

[DrChiZhang]

How about the improvement of this modification?

[FabienPean-Virtonomy]

I assume close to nil. Previous version was creating an affinity_partitioner for each translation unit which is pretty close to this. This may have had an impact when the affinity partitioner object is used multiple times in different algorithms within the same source file. I just tried to follow the documentation for the recommended use of this feature.

If we trust solely the CI (which is not really representative of actual load because of using 2/3 cores only) then it seemingly gets worse for macOS based on a single sample