[PD] most efficient use of [partconv~]

Roman Haefeli reduzierer at yahoo.de
Tue May 20 10:55:16 CEST 2008

On Mon, 2008-05-19 at 09:12 +0200, Frank Barknecht wrote:
> Hallo,
> Roman Haefeli hat gesagt: // Roman Haefeli wrote:
> > i made a patch, that uses several instances of an abstraction based on
> > the partconv~ external in order to do binaural spatialization of sounds
> > using a set of hrtf tables.  the hrtf files are all loaded on loadbang
> > into tables, so that they can be accessed quickly. it is part of the
> > patch, that a 'set <tablename>' message to all [partconv~]s is sent
> > quite often, which leads to dropouts on the box, where the installation
> > is meant to run (for some reason not on my personal laptop). i also
> > noticed a difference in performance between an old version of partconv~
> > (0.1) and the current svn version, whereas the latter is more likely to
> > cause dropout at high 'set' message rates. 
> I had a quick look at the partconv~ source code and found that
> everytime a "set" message is sent, partconv~ does quite a bit of
> memory allocation to configure itself for the new convolution core.
> This may be a reason for the dropouts if you "set" the objects with a
> high rate, as memory allocation is not very realtime friendly. You
> could try to avoid some of the "set"s by creating more partconv~
> objects that statically refer to their tables. Of course that's a bit
> tricky with 1400 tables ...

thanks for confirming, what i guessed. so one (probably not the
smartest) solution is to use a computer with fast memory access. in my
case, lowering the message rate and increasing jackd buffersize a bit
already helped.


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