[PD] MIDI In-to-Out Latency

Pedro Lopes pedro.lopes at ist.utl.pt
Sun Jun 6 19:19:50 CEST 2010

Hyperthreading can be disabled - I never tryed it myself - but its in BIOS
advanced options for most computers/motherboards I've seen.

Depending on the situation that can be either good of bad, If you only run
one intensive cpu program (i.e.: one instance of PD) is good to give a full
cpu to it, but if you run for instance Renoise (which for me is cpu
intensive) and Pd, disabling hyperthreading will result in even more buffer
glitch. I think some game folks used to disable hyperthreading in intel's p4
and get better rates than with it turned on, just to serve as a mere example
- but then again Software Engineers would argue that this is just a matter
of how threaded the programs are, and how they make good use of that.

Best regards,

On Sun, Jun 6, 2010 at 6:08 PM, Ingo Scherzinger <ingo at miamiwave.com> wrote:

> Looks like there are some problems with the soundcard drivers.
> I'm running very heavy patches with 3 ms. Both on Windows XP and Ubuntu.
> Audio and MIDI.
> However, on Windows I am using a RME HDSP card which has very good ASIO
> drivers. Don't forget to set system options to "background tasks" (very
> important!).
> I also noticed that in general Intel CPUs are pretty bad for Pd since they
> use hyperthreading which makes Pd see two CPUs and uses only 50% of one
> core. AMDs are twice as efficient because Pd uses the entire core.
> Ingo
> > cyrille henry wrote:
> > > but since you don't like this, you should : in pd / startup
> > > add in "startup flags" :
> > > -noaudio -audiobuf 0 -mididev 3
> > > than : "save all setting" and it should work for next reboot...
> > >
> >
> > That's fine but what if you want to trigger sound with the MIDI input?
> > I've been trying some settings and find that if I set the delay less
> > than 100ms the MIDI delay goes up to about 500ms, if it works at all.
> >
> > I usually only use Pd on WinXp to generate background tracks since the
> > latency is so awful compared to linux.
> >
> > Martin
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Pedro Lopes
contacto: jazz at radiozero.pt
website: http://web.ist.utl.pt/Pedro.Lopes
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