[PD] Fwd: Variable number of objects?

Ingo ingo at miamiwave.com
Thu Sep 29 12:01:52 CEST 2011


I just added the [; pd dsp 0( when starting to creat voices to speed it up
and eliminated the 17 voices limit of the patch.

Maybe it's useful for somebody.

Ingo

> -----Ursprüngliche Nachricht-----
> Von: pd-list-bounces at iem.at [mailto:pd-list-bounces at iem.at] Im Auftrag von
> Ingo
> Gesendet: Donnerstag, 29. September 2011 11:33
> An: 'Roman Haefeli'; 'Ludwig Maes'
> Cc: 'Pd List'
> Betreff: Re: [PD] Fwd: Variable number of objects?
> 
> Actually, I just tried again to simply copy a couple of voices and it only
> took a fraction of a second with a very short dropout - even with the dsp
> on.
> 
> I have recently installed Natty instead of Lucid on a new machine. Maybe
> it
> has something to do with realloc that Mathieu mentioned.
> 
> So it looks like dynamic patching of voices isn't "that" much of a problem
> here anymore. It still takes 7-8 seconds to create 16 voices in my case
> with
> the dsp off (12 with the dsp on) but that's still faster than restarting
> the
> patch. I would never have checked again if nobody would have mentioned it.
> 
> I have attached a patch that I used for testing. These voices were
> receiving
> their input with [receive] so no connections were needed. If you are using
> wired inlets you will have to dynamically add the connections of course.
> 
> I added a cut & paste at the end because for some reasons the voices
> didn't
> get initialized correctly. Not sure if this is needed for other
> voice-abstractions.
> 
> Ingo
> 
> 
> > -----Ursprüngliche Nachricht-----
> > Von: pd-list-bounces at iem.at [mailto:pd-list-bounces at iem.at] Im Auftrag
> von
> > Roman Haefeli
> > Gesendet: Donnerstag, 29. September 2011 08:36
> > An: Ludwig Maes
> > Cc: Pd List
> > Betreff: Re: [PD] Fwd: Variable number of objects?
> >
> > On Wed, 2011-09-28 at 19:29 +0200, Ludwig Maes wrote:
> > >
> > >
> > > ---------- Forwarded message ----------
> > > From: Ludwig Maes <ludwig.maes at gmail.com>
> > > Date: 28 September 2011 19:29
> > > Subject: Re: [PD] Variable number of objects?
> > > To: Ingo <ingo at miamiwave.com>
> > >
> > >
> > > I actually meant more in general, also for non-~ signals (i.e. also
> > > control rate .pd patches). I referred to polysynth such that people
> > > would see more easily what I meant. Are there really no such
> > > primitives? That seems like quite a restriction...
> > >
> > > How can that take 10 seconds?? I dont see what would cause such a huge
> > > overhead, i'd expect an increase in computations & memory though (say
> > > from 10 voices to 11: 10% increase in cpu workload & ram dedicated to
> > > these voices..., I fail to see what would necessitate a long
> > > initialization...)
> > >
> > > also, how is it done even with the long delays?
> > >
> >
> >
> > As I understand it, the whole DSP is recompiled whenever it is changed.
> > So, if you have a very large patch (and Ingo seems to be an expert in
> > very large patches) and you create another voice, it's easily possible
> > to eat up quite some time.
> >
> > Also, it's probably much slower the first time, if the voice abstraction
> > is built of many other abstractions, which need to be read from disk.
> >
> > But I guess you are right about the increase in CPU workload _after_ the
> > DSP graph has been recompiled: A switch from 10 two 11 instances is
> > expected to show only an increase of 10% in CPU usage.
> >
> > It's been said, that often you can gain quite some time while turning
> > off DSP during dynamic instantiation. But I guess, this makes only a
> > difference when performing several instantiations at the same time. When
> > DSP is on, each cycle would cause a complete DSP graph recompilation,
> > whereas when DSP is off, it's only recompiled once (after turning it on
> > again).
> >
> >
> >
> > Roman
> >
> >
> >
> > _______________________________________________
> > Pd-list at iem.at mailing list
> > UNSUBSCRIBE and account-management ->
> > http://lists.puredata.info/listinfo/pd-list
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