Re: Clarification about [pd~]

Audio I/O Error simply means that you got an audio dropout!

> Out of interest: Do both pd instances in this case access your hardware
> I/Os?
The [pd~] subprocess has no access to the audio hardware. [adc~] and 
[dac~] always communicates with the parent process.

On 24.03.2025 14:35, Peter P. wrote:
> Dear Pierpaolo,
>
> not an expert on this issue but...
>
> * Pier Bar <[email protected]> [2025-03-24 13:49]:
>> Hello Pd community,
>>
>> I've encountered an interesting behavior regarding CPU management in Pure
>> Data using [pd~], and I'd appreciate your insights or confirmations.
>>
>> Here's my scenario:
>>
>> I'm running a computationally "intensive" FFT analysis with sigmund~
>> (similar to the 17.partialtracer example, but without using data
>> structures), on a 4-second audio array. This analysis is causing "Audio I/O
>> Error" warnings and audible dropouts when executed within the main Pd
>> patch, DSP active, latency ~50ms... Increasing the latency further would
>> solve the problem, but I would like to find another solution.
> ...are you able to track the single Pd instance audio errors down to CPU
> usage? Does a simpler patch with lower cpu usage not print these errors?
>
> Have you tried to change other audio options?
>
> I am not on OS X so I don't know if -callback or -rt have any effect
> there.
>
>> Initially, I attempted to resolve this by offloading the computation into a
>> subprocess via [pd~]. However, despite what seemed to be a correct
>> configuration (no audio signals shared, only control messages exchanged,
>> -nogui option used), I still observed audio dropouts and "Audio I/O Error"
>> warnings in the main patch.
>>
>> otherwise when running two completely separate instances of Pd manually,
>> that is two versions of Pd, 0.55-1 and 0.55-2 (one dedicated to real-time
>> audio and another solely for the FFT analysis, without using [pd~]), my
>> system (macOS Apple Silicon M3) handled both processes simultaneously
>> without any audio dropouts or errors.
> Out of interest: Do both pd instances in this case access your hardware
> I/Os?
>
> best, Peter
>
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