Set number of OpenBLAS threads

[johngebbie]

This sets the number of openblas threads in case openblas wasn't compiled with USE_LOCKING=1 USE_THREAD=0.

This slightly nicer version is untested, but simply adding the #include and openblas_set_num_threads(1); is what I patched for Alpine.

[dyustc]

Hi, just has some other thoughts. why the openblas threads has to be set to 1, wouldn't it be faster if there are more threads in computing with openblas?
in fact, I call the openblas_set_num_threads(4) in vosk, it seems it isn't working, the threads is always 1 here.

[johngebbie]

Hi @dyustc, I dunno but iirc it was eating the CPU and absolutely chugging when I was using a system package of openblas without this.

[nshmyrev]

Most of the time system is doing search actually, not using openblas at all. So openblas threads likely have no effect. If you are looking for efficient multicore recognizer, check recent neural network systems like sherpa.