@martin-frbg Could I please get a review for this patch ?

As soon as I can concentrate on it. Would you happen to have any benchmark numbers available ? The idea of using varying thread counts has been floated a few times in the past, but the added logic seemed to outweigh gains on x86_64 at least

@martin-frbg Thank you for your comment. As mentioned in the description, the geo. mean speedup is ~1.1 for M=N=K up to 1024. Here is a figure that shows the data on NEOVERSEV1 with 64 cores.

Hmm, I don't really like the added complexity with yet another "hidden" table of parameters (I assume the V2 would need different thresholds), but what's not to like about the added performance...

Yes, V2 would need another set of parameters. I think the complexity is inevitable if we want optimal performance. We could try to somehow organize these tuning parameters, e.g. into files/folders. I am open to suggestions.

Merging to give it more exposure, but I think ideally the table part should be in (or closer to) param.h