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

katja katjavetter at gmail.com
Tue Feb 28 20:58:44 CET 2012

On Tue, Feb 28, 2012 at 7:12 PM, Rich E <reakinator at gmail.com> wrote:

> Anywho, the latest nightly build is still running at around 17% cpu for me
> before ever opening a patch.  It's just enough to make my fans hum. :)
> I've attached a process sample from Activity Monitor, hope it helps track
> it down.
An interesting question. On my MacBook with OSX 10.5 Pd is sometimes
running as much as 27% in 'idle' state. When Pd is started, dsp if off but
the adc/dac are not. Only after turning dsp on, and off again, the adc/dac
are off.

As you're on OSX, you can use the magnificent performance profiler
Shark.app to get a better view of CPU load of functions. Most CPU time
for adc/dac is consumed by DspFuncLib, AppleHDA and mach_kernel.
Apparently, the system does a lot of processing on the audio stream without
us asking for it. There's denoise, equalizer and fft functions amongst
others. I don't think Pd can influence these routines, except by not using
the adc/dac.

CPU load for adc/dac depends on hardware. Using an external audio interface
reduces the load.

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