[PD] PDDP meeting?

Arie van Schutterhoef arsche at xs4all.nl
Sat May 6 22:25:56 CEST 2006


>jMax's problems were even worse than what you say. The messagesystem
>(which we used for video) couldn't run clickfree either, with hiccups
>longer than 100 ms! and i'm not sure that they were fixable by adding an
>extra CPU.
-There is a big misunderstanding about the purpose for what jMax was designed
 in the first place: a replacement for the Ircam Signal Processing
Workstation  a.k.a ISPW. Period. At that time approx. 1991-1995 signal
processing meant
in their terminology: audio-processing. This was done previously with
dedicated processors:DSP's. Subsequently it became possibleto this with
general CPU's like PPC, MIPS, UltraSparc. etc., etc., etc... Intel had a
lousy reputation in this. They later on discovered there was a market for
this so up comes MMX, SSE...

IRCAM wanted a 'virtual ISPW' and found this at that time in SGI machines
with multiple cpu's and the OS (Irix) that offered, through the REACT
extensions, an adequate realtime response (under 20 milliseconds...), hence
jMax. Therefore the controlling host became a Java-gui on cpu 1 and all the
signal processing stuff were put on other cpu's. Now under Irix you can
assign these functions to different processors, because REACT allows you to
do so. Thus if you wanted to do video use a separate processor!

However one can question whether it was a clever thing to do this
seperation, on the other hand with current dualcore processors becoming
standard for the next couple of years, maybe it ought to be revived.
Perhaps somebody ought to contact Francois Dechelle in advance..
I think, by the way, IRCAM could have supported it slightly more decently
with their lists.

AvS








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