Re: Multicore on Pi using pd~ object

Oh my goodness, you’re absolutely right, I simply forgot to loadbang that start message! 

Many apologies for the silly mistake, and thanks Christof for pointing it out.

> 
> ------------------------------
> 
> Message: 4
> Date: Thu, 10 Oct 2024 13:46:09 +0200
> From: Christof Ressi <[email protected]>
> Subject: [PD] Re: Multicore on Pi using pd~ object
> To: [email protected]
> Message-ID: <[email protected]>
> Content-Type: text/plain; charset=UTF-8; format=flowed
> 
> Ok, I should have looked at the patch first... DSP is turned on, so that 
> is not the problem.
> 
> The problem is simply that the subprocesses are not started because you 
> forgot to connect the [pd~ start( message to a loadbang :)
> 
> When I click the bang object, I can hear low sine tones.
> 
> Christof
> 
> On 10.10.2024 13:39, Christof Ressi wrote:
>> I haven't looked at the test patch but I'm pretty sure the problem is 
>> that you didn't turn on DSP on the parent patch.
>> 
>> The reason is that [pd~] object is driven from the parent patch. This 
>> is also mentioned in the help patch:
>> 
>> "ATTENTION: DSP must be running in this process for the sub-process to 
>> start and run. This is because its clock is slaved to audio I/O it 
>> gets from us!"
>> 
>> Christof
>> 
>> On 10.10.2024 12:31, Yann Seznec wrote:
>>> Hello!
>>> 
>>> I’m attempting to use the pd~ object for the first time on a 
>>> Raspberry Pi, with the idea of taking advantage of the multiple CPU 
>>> cores.
>>> 
>>> I’m using a Pi 3 with the latest 64bit “headless” OS, running Pd 
>>> 0.53.1 (installed via apt-get). My understanding is that using the 
>>> pd~ object should run each instance of a patch on a different core of 
>>> the Pi.
>>> 
>>> Here’s the test patch: https://github.com/yannseznec/multicoreTest
>>> 
>>> On the command line, i'm attempting to run the "multiTest.pd" file 
>>> like so:
>>> pd -nogui multiTest.pd
>>> 
>>> Pd launches and it gives me the message "pd~ version 0.54" but there 
>>> is no sound.
>>> 
>>> Running only the subpatch (rand_osc.pd) produces a single sine tone 
>>> as expected.
>>> 
>>> Am I using the pd~ object incorrectly, or misunderstanding something 
>>> about how this should all work?
>>> 
>>> Thanks!
>>> 
>>> Yann
>>> 
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