Re: Instructions for Installing BLAS and LAPACK library on Octave 5.2.0

On Mon, Sep 28, 2020 at 1:46 PM Ilaya Bharathi <[email protected]>
wrote:

>
> Is it an openblas library which enables the multithreading is inbuilt with
> octave ?
>
> I haven't done this myself, just reading the information and this thread
from Ian that seems to be the case.



> If so, please clarify which dll file(librefblas.dll or libopenblas.dll )
> needs to be pasted where. If this is not the case, let me know what to do
> for the multithreading to work.
>
> based on the file names, I would assume the librefblas.dll is the  NetLib
reference BLAS <http://www.netlib.org/blas/> and  libopenblas.dll is the
OpenBLAS that Ian mentioned.



> finally, after implementing the multithreading feature. how to check it
> whether it's implemented or not ?
>

again, I would try something like what Ian mentioned:


>This means if you have a program such as:
>   a = rand(1, 1000000);
>   b = a*a;
>
>then Octave will automatically use openBLAS to do the calculations. By
default openblas uses all processor threads. You can configure the number
of threads using the environment >variable OPENBLAS_NUM_THREADS.