Has to be a classic case of a performance "glitch/mishap".
For instance, a drastic oversubscription of threads, which may be the case if a multithreaded library calls a multithreaded BLAS.
Can be a case of a drastic affinity problem, e.g. all threads pinned to one core.
It has to be a problem of that sort.
I would focus on the number of threads first, and then affinity.
Just an educated guess.
As a side note, GNU + Windows + OpenBLAS sounds like an explosive combination.
I would attempt that if I was trying to break things
Users browsing this forum: No registered users and 0 guests