xianyi wrote
>
> Hi Nitzan,
>
> If you built OpenBLAS with 2 threads, it would only start 2 threads on
> multicore processors.
>
> OpenBLAS can detect the number of cores on runtime.
> Thus, you can build OpenBLAS with a larger number (NUM_THREADS = xx in
> Makefile.rule), e.g. 12 , 16 or 24.
>
> Thanks
>
> Xianyi
>
> https://mailman.cae.wisc.edu/listinfo/help-octave
>
Hi Xianyi,
Thanks, I know that and have already tried builds with NUM_THREADS=4 which
performs much better on a 4 cores cpu.
Will you recommend using this build also on 2 cores cpus ? I don't how to
verify whether this build use only 2 threads on a 2 cores cpu but I have
noticed some (about 15%) performance degradation on the core i3-540 I have
tested.
Nitzan
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