[PD-dev] message passing

[Orm Finnendahl]

Hi Krzysztof,,

I don't really understand, what you're asking. Shall we do experiments
on our own and share the results? In my externals I normally use the preallocation method as
it guarantees to be somewhat fast, but the getbytes method has its own
advantages in being more flexible due to its dynamic nature. Apart
from that the getbytes methos can make prototyping in many cases much
faster, too (as you don't have to maintain dangling pointers).

--
Orm.

Am Donnerstag, den 06. Juni 2002 um 16:44:51 Uhr (+0200) schrieb Krzysztof Czaja:
> hi,
> 
> perhaps all the more experienced Pd coders did not notice this
> thread (or my question was badly posed)?  Anyway, I would like
> to try once again, this time with some measurement data (not
> very hard data yet)...
> 
> ...on my system, using method 5 as a reference, on average:
> 
> . method 1 performs 2.5 times slower,
> 
> . method 4 is 4.25 times slower and has nasty peaks.
> 
> For each method there are two objects in my test patch:  one
> outputs a message stored internally (no copying cost in case of
> method 5), the other appends its internal message to a message
> passed from the first object.
> 
> Whoever likes to try the same (lame) test, and make further
> experiments, might grab the newest cyclone snapshot, wherein there
> is a 'testmess' class and a testmess-test.pd test patch.
> 
> Krzysztof
> 
> Krzysztof Czaja wrote:
> ...
> > what is the proper way (fast, robust, surviving Pd api changes)
> > for an external to send arbitrarily long messages, if these
> > messages contain a mix of data acquired through inlets and
> > data stored in an object?
> ...
> > 1. copy data to the main stack, i.e. use a buffer in the local
> > memory space of a function;
> ...
> > 4. allocate with getbytes() in every call
> ...
> > 5. use a pre-allocated buffer stored in an object's memory space,
> 
> 
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