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 <katjavet...@gmail.com>: > On Fri, Feb 6, 2015 at 11:56 PM, Miller Puckette <m...@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 > > _______________________________________________ > Pd-list@lists.iem.at mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list >
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