Re: Instructions for Installing BLAS and LAPACK library on Octave 5.2.0
Ilaya Bharathi <[email protected]>
| Newsgroups | gmane.comp.gnu.octave.general |
|---|---|
| Message-ID | <CAGZhkujzd1GJZs0E-SN1q445_uFvDoaPR7r3n+oU3x=xFjN4XA@mail.gmail.com> |
Hi Nicholas, Do you have the variable OPENBLAS_NUM_THREADS by default with the zip installation? Also, are there any codes to test the implementation? Many thanks Ilaya bharathi On Tue, Sep 29, 2020 at 7:30 PM Nicholas Jankowski <[email protected]> wrote: > >>> - Downloading Octave 5.2.0-64 bit executable from the official GNU >>> Octave website( >>> https://www.gnu.org/software/octave/download.html#ms-windows) for >>> Win 10 >>> - Installing the same and checking with the default OPENBLAS library. >>> - Assigning the value for the environment variable OPENBLAS_NUM_THREADS >>> = "the number of processors we need to utilize" >>> - >>> >>> >> The second step is not necessary. Otherwise yes. >> >> Ian >> > > Do you mean the installing or assigning step? In my default config zip > install, OPENBLAS_NUM_THREADS was empty. I set it to different values from > 1-4 since I have a 4 core machine, and didn't notice any real difference > running that test routine you posted. i extended the 1e8 to 2e8 and 1e9 to > get meaningful runtimes, but there seemed to be no difference changing the > value of that option. in all cases multiple cores were taxed on > execution. It's a managed machine so I don't have Process Explorer to > actually verify the thread count, so maybe other things are happening that > I'm not noticing. >