OpenBlas thread is always 1 in Almalinux

[SemiProg]

Hi,
I have installed openblas using dnf in almalinux 8.
Using this command, I have checked the number of thread, but it is always 1...
std::cout << "Current OpenBLAS Threads: " << openblas_get_num_threads() << std::endl;

echo $OPENBLAS_NUM_THREADS
4

I would like to calculate matrix in parallal. Could you please help me to solve this issue?

[martin-frbg]

What string does openblas_get_config() return ? It could be that dnf installed a single-threaded build of the library (which will have USE_THREAD=0 somewhere in the config string).

[SemiProg]

Thank you very much for very quick reply. It looks that it has been installed as a single-threaded.

OpenBLAS 0.3.15 DYNAMIC_ARCH NO_AFFINITY Prescott SINGLE_THREADED