[PD] implications of pd~ for 'poly' objects
fred-ordi
ordi at fredvoisin.com
Wed Sep 9 11:06:06 CEST 2009
Sorry if this question is obvious, may be an alternate for live audio
processing with clusters:
does it exist some netsend/netreceive for audio in Puredata ?
I remember having using one (experimental) few years ago but was within
MaxMSP...
fred
IOhannes m zmoelnig wrote:
> Phil Stone wrote:
>> Hi Hans,
>>
>> Thanks for replying. I don't quite understand what you mean by
>> "manually manage". As far as I know, without something like [pd~],
>> there's no way to divide up and assign the Pd audio process to more
>> than one core. Half of the cores on a quad-core are therefore useless
>> to Pd (accounting for the fact that the graphical process gets its own
>> core).
>>
>
> the problem is, that poly-class objects are usually meant for _many_
> objects (10+; i'm only repeating here what hans has already said).
> [pd~] will fork a new thread for each of it's instances.
> when doing multi-core processing (and this is really the only thing pd~
> is good for; e.g .it's not good if you want to have different priorities
> / asynchronous processing), you usually don't want to create more
> threads than you have cores.
> why? performance reasons! if you create e.g. 1000 threads for 1000
> instances of [doodle~] on a quad-core machine, your computer will spend
> more time handling context-switches and the like (that is: the overhead
> for managing the threads) than doing the actual job.
> as a rule of thumb, the optimum number of threads is about the number of
> cores you want to use.
>
> since what is sold to customers as "multi-core" processors usually does
> not involve more than 4 cores, the "best" (though probably not the most
> comfortable) way to assign work to the cores from within Pd is doing it
> "manually"
>
>
> fmgasdr.#
> IOhannes
>
>
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