OpenBLAS >= 0.3.23-2 update requires manual intervention

[archisman]

Installing blas-openblas to enable the upgrade causes matrix diagonalization to slow down significantly

Matrix diagonalization became slow after installing blas-openblas

I am using GNU Octave to diagonalize matrices. Installing openblas increases performance significantly. I saw this news, installed blas-openblas and blas64-openblas, and updated. After that, matrix diagonalization became much slower than before. An workaround is to install https://aur.archlinux.org/packages/openblas-lapack, but it would be great if someone has some other suggestion. It takes a lot of time to compile openblas-lapack. The following Octave code 12 seconds before the upgrade, an…