[PD] latest Pd-Extended cpu usage (was: new editing features of Pd-extended 0.43, now in beta)

[Rich E]

Note that the issue I'm seeing is a difference in cpu usage between
Pd-Extended and Pd-vanilla.  In OS X 10.7, when opening up each version of
pd and looking at Activity Monitor (before every opening a patch or turning
on DSP), I get:

- Pd-0.43.1-extended-20120228 running at ~ 17% cpu
- Pd-0.43-1 running at ~ 7% cpu

I can file this on sourceforge if it would be easier to track there.

On Wed, Feb 29, 2012 at 8:56 PM, Jamie Bullock <jamie at postlude.co.uk> wrote:

>
>
> On 28 Feb 2012, at 21:10, katja wrote:
>
> >
> >
> > On Tue, Feb 28, 2012 at 9:06 PM, Jamie Bullock <jamie at postlude.co.uk>
> wrote:
> >
> > Yup, I think this is related to the Portaudio driver. I reported it here:
> >
> >
> http://sourceforge.net/tracker/?func=detail&aid=3100679&group_id=55736&atid=478070
> >
> > I don't think it's Portaudio itself that's at fault, but rather the way
> it interfaces with Pd.
> >
> >
> > DspFuncLib is in:
> >
> >
>  /System/Library/Extensions/AppleHDA.kext/Content/Plugins/DspFuncLib.kext/Contents/MacOS.
> >
> > If you run command nm on the lib, you'll see a plethora of dsp functions
> like MultiBandCompressor, NoiseCanceller, Loudness, Softclip, Limiter and
> whatnot. Functions in this lib are called when the internal soundcard is
> used. When using an external soundcard with Pd, DspFuncLib is not called
> and that makes the big difference in CPU load.
> >
> > AppleHDA and mach_kernel are Apple libs as well and together with
> DspFuncLib they are responsible for the crazy CPU load in the
> 'idle-but-dsp-on' case.
> >
> > PortAudio functions are apparently statically built into Pd and they
> consume very little CPU time.
> >
>
> It seems that you're right, so I've closed the bug (my apologies to
> PortAudio!).
>
> I guess the real 'fix' for this is that Pd now has a block size setting in
> Preferences. With a block size of 1024, using the PortAudio driver I get a
> CPU use of <2% with DSP on. Checking "use callbacks" also seems to reduce
> CPU. Here, I got a reduction of ~2% with that checked.
>
> Also, I'm not sure if this is an improvement in recent versions of OS X,
> but Pd now runs at only ~5% with DSP on using the PortAudio driver with a
> blocksize of 64. This is on a MacBook Air i7/1.8.
>
> best,
>
> Jamie
>
> --
> http://www.jamiebullock.com
>
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