Re: volk questions

Hi Fons,

first off, we'd need to know a bit more about your setup. Could you
share the versions of VOLK and your host system, e.g. OS, version, etc.
Furthermore, do you use a VM, a container, or smth like this?

Regarding your question, if these functions may be useful to VOLK / GNU
Radio. I'd say yes. We'd have to figure out how this may work in
practice though. I'd suggest to start with a PR.

Cheers
Johannes

On 13.10.23 16:08, Fons Adriaensen wrote:
> Hello all,
>
> I've recently installed volk on two machines, both Intel i5
> but different types.
>
> 1. On one of the two machines 'make' failed while 'cmake ..'
> ran without errors. Installing boost fixed this. Could it be
> that the cmake step doesn't check for boost ?
>
> 2. On one the two machines, 'volk_profile -R volk_32f_sin_32f'
> only tests the SSE4 versions even if AVX is supported (as
> confirmed by profiling e.g. volk_32f_asin_32f), and an AVX
> implemention is available (it is the selected one on the
> other machine). Why is this ?
>
> 3. The reason I installed volk was to compare it against
> some SSE4 code I developed for sin() and cos(). These calls
> use cycles instead of rads as the argument as I find that
> generally more convenient. They are not to full float32
> precision, but more than good enough for e.g. music
> synthesis. Testing them against volk on the two machines
> produces:
>
> fons@zita1:~/library/ssemath> testsin
> sinf(): 0.005975 us
> volk_32f_sin_32f(): 0.003983 us (SSE4.1)
> sse_fastsin_f32(): 0.000802 us
>
> fons@zita4:~/library/ssemath> testsin
> sinf(): 0.005324 us
> volk_32f_sin_32f(): 0.002579 us (AVX2)
> sse_fastsin_f32(): 0.001088 us
>
> The results for volk are consistent with the volk_profile
> as above.
>
> Harmonic distortion is:
>
> Harm Level (dB)
> 3 -162.0
> 5 -137.8
> 7 -128.6
> 9 -147.3
> 11 -141.1
> 13 -138.1
> 15 -138.1
> 17 -138.6
> 19 -139.4
> 21 -140.5
> 23 -141.6
> 25 -142.8
> 27 -143.6
> 29 -144.6
> 31 -145.7
> THD: -125.7
>
> Would such routines be useful in volk / gnuradio ?
>
> Ciao,
>