Which version of blas did you install? They have different performance.

Le 18 oct. 2016 22:18, "Bogdan Opanchuk" <bog...@opanchuk.net> a écrit :

> > For 3x3 filters with 1 channel, it may just be too small for the
> im2col/CorrMM version to show any improvement.
>
> So the variant that I had with straightforward addition of submatrices is
> the best way to go?
>
> > Also, are you using openmp or a threaded BLAS? You might want to try
> disabling openmp or trying different numbers of BLAS threads.
>
> I'm not really sure, I just installed the package without changing any
> settings. Judging by the process monitor, it only uses one thread.
>
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