I suspect a lot of the graphics could run perfectly fine if they took
advantage of the gpu better. A lot of the current rendering in
GNURadio (and GQRX) is very cpu bound.
I had a spectrum and waterfall running easily at 60fps on a pi3 by
using opengl properly. Using vulkan on pi4 the sky is the limit.
--Albin
On Thu, Dec 17, 2020, 13:18 Marcus Müller <mueller@kit.edu
<mailto:mueller@kit.edu>> wrote:
Can't stress this enough. Running a 32 bit Linux on a RPi 4 would be
like running Windows 98 on a modern PC and expecting top performance
from the CPU. You're not making use of the CPU you have, you're only
making use of a legacy mode that it still supports.
Best regards,
Marcus
On 17.12.20 10:53, Albin Stigö wrote:
> 64bit mode is most likely better because in addition to being
64bit it
> enables additional cpu features (certain new instructions and
more SIMD
> NEON registers)
>
> On Thu, Dec 17, 2020, 10:36 jean-michel.friedt@femto-st.fr
<mailto:jean-michel.friedt@femto-st.fr>
> <mailto:jean-michel.friedt@femto-st.fr
<mailto:jean-michel.friedt@femto-st.fr>>
<jean-michel.friedt@femto-st.fr
<mailto:jean-michel.friedt@femto-st.fr>
> <mailto:jean-michel.friedt@femto-st.fr
<mailto:jean-michel.friedt@femto-st.fr>>> wrote:
>
> The benchmark on volk/64 bit kernel v.s 32 bit Raspbian is at
> https://pubs.gnuradio.org/index.php/grcon/article/view/73/55
> <https://pubs.gnuradio.org/index.php/grcon/article/view/73/55>
> last page. I get 3 to 7-fold improvement by volk_config on a
dedicated
> toolchain for 64-bit CPU.
>
> JM
>
> --
> JM Friedt, FEMTO-ST Time & Frequency, 26 rue de l'Epitaphe,
25000
> Besancon, France
>
> December 17, 2020 10:28 AM, "Kristoff" <kristoff@skypro.be
<mailto:kristoff@skypro.be>
> <mailto:kristoff@skypro.be <mailto:kristoff@skypro.be>>> wrote:
>
> > HI all,
> >
> > I also have a RPi4 (*).
> > Some follow-up question.
> >
> > What OS would be the best for this?
> > Would running 64 bit make a difference?
> >
> > I don't know to what degree this is related, but I did a
test running
> > WebGL (**) on that pi, and I got about 1/3 of the frames per
> second on
> > my RPi4 compared to my laptop (which only has a UHD
Graphics 630
> Mobile,
> > so not the best or latest neither)
> > Is the GPU in the Pi4 good enough to run many GUI elements
in GNU
> Radio
> > at the same time?
> >
> > Kr.
> >
> > (*) RPi4B 8 GB, 120 SSD
> >
> > (*) https://webglsamples.org <https://webglsamples.org>
> >
> > On 16/12/2020 11:10 p.m., Dan Romanchik KB6NU wrote:
> >
> >> Has anyone successfully run GNU Radio on a Pi 4? I
recently purchased
> >> an RTL-SDR dongle and thought it would be fun to
experiment a little
> >> with GNU Radio and learn something about SDR.
> >>
> >> A couple of days ago, I fired up GNU Radio, and after
having some
> >> trouble figuring out how to get the audio sink to talk to
the Pi, I
> >> downloaded VE6EY's FM receiver flow graph. The flow graph
runs, but
> >> the Pi 4 just doesn't seem to have enough horsepower to
run it in
> real
> >> time. The audio is slow and distorted.
> >>
> >> Thinking that it might be the WX widgets slowing down the
program, I
> >> first deleted the FFT display widgets, then converted the
WX slider
> >> controls to QT range controls. Neither had any effect on
how well the
> >> flow graph ran.
> >>
> >> GQRX and CubicSDDR seem to work just fine. At least with
both of
> them,
> >> I'm able to receive FM broadcast and NOAA weather
station. But, maybe
> >> the PI4 just doesn't have enough horsepower to run GNU
Radio? If so,
> >> that's kind of disappointing.
> >>
> >> 73! <—ham radio lingo for “best regards"
> >>
> >> *Dan KB6NU*
> >> CW Geek, Ham Radio Instructor
> >> Author of the "No Nonsense" amateur radio license study
guides
> >> Read my ham radio blog at http://www.kb6nu.com
<http://www.kb6nu.com>
>