[PD] new raspberries

Pierre Massat pimassat at gmail.com
Sat Feb 7 13:45:32 CET 2015


Dear Katja,

Could you please tell us what buffer size you're using in Pd ? Can you get
lower than 16 ms without dropouts with a reasonable patch with both adc and
dac ?

Thanks in advance,

Pierre.

2015-02-07 10:39 GMT+01:00 katja <katjavetter at gmail.com>:

> On Fri, Feb 6, 2015 at 11:56 PM, Miller Puckette <msp at ucsd.edu> wrote:
> > Also try running "pd -nosleep", which sometimes persuades kernels to
> > schedule the process differently :)
>
> Indeed, "pd -nosleep" does the magic. Command htop shows hat the
> kernel has 100% CPU time reserved on one core (fixed per session) for
> pd -nosleep. Pd-gui runs on one of the other cores, alternating. The
> audio is fine with no dropouts.
>
> It is possible to start two instances of pd -nosleep, and get a core
> reserved for each. The second instance finds the alsa device busy of
> course, and this makes no sense in practice. Maybe the [pd~] object
> can profit from the multicore processor.
>
> I've checked current draw with the setup: Raspberry Pi + USB keyboard
> + USB mouse + USB audio interface (iMic) together consume ~400 mA with
> only the desktop running, and ~450 mA with pd -nosleep running idle or
> with a CPU intensive patch. This indicates there is some frequency
> scaling going on after all. I'll look into that again when there's
> more info about the new Pi's config defaults and options.
>
> Katja
>
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