[PD] pd~ & gem

Cyrille Henry ch at chnry.net
Sat Nov 24 10:27:10 CET 2012

Le 24/11/2012 05:48, puredata at 11h11.com a écrit :
> a screenshot:
> https://dl.dropbox.com/u/1455235/bg.png
> what is the -fifo option of [pd~]?

this is an important option:
it set the delay (in audio block) between pd and pd~.
since pd and pd~ are syncronize at audio sample rate, if the fifo is small, any blocking operation in pd~ will block pd.

so, if your GPU can't compute more than 20fps, each frame need about 50ms to compute. So the fifo must be more than 50ms. somthing like 40 block is a minimum in this example.

moreover, you have to be aware that pd / pd~ communication is inefficient, so cpu is higher using pd/pd~ than using 2 pd.
(that the reason of the share_mem lib)


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