[bee_rider]

Interesting.

MKL is Intel’s famous numerical library (it includes things like BLAS “basic linear algebra subroutines” and fast Fourier transforms). It is availible for free, but IIRC they had some support plans maybe, maybe that’s what you are remembering?

It is closed source, but you can look at the source of the best open source competitor libflame/BLIS, and see that most of the performance comes from C and assembly.

It is difficult to beat “unlimited effort” C, but not many program really justify that treatment.

[foxglacier]

MKL used to not be free. You had to buy it from a local reseller for a few hundred dollars per developer.