[PD] new raspberries

[Cyrille Henry]

Le 07/02/2015 10:39, katja a écrit :
> 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.

all instructions have different current draw signature.
it's normal to have the current to change depending on CPU utilization, even at fixed clock frequency.

cheers
Cyrille

  
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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