[Radiance-general] Running parrellel processes in ubuntu

[Lars O. Grobe]

Hi Matthew!
>  cores. I've been reading up on the -N option for rad, but whenever I
> use "-N 2" as a parameter, only one of the cores is running rad. Does
> the -N option actually work, or do I need to use rpiece for running
> radiance on both processors.
Well it works, but not the way you were hoping for I guess ;-) The -N 2
will distribute your views (or frames) over two rpict processes - but it
will not divide one view into parts (or pieces, hm, that is why it is
called rpiece). So to make use of more then one CPU or core or network
node or whatever, you will need more then one view defined. By the way,
I have also used ranimate for this task, which has some  extra
functionality for cluster support...

For most cases, with modern machines, it is not worth the trouble to
care about distributing the rendering calculations for one view. In some
special cases, where you have very complicated scenes or want to render
in very high resolution, rpiece may be a good solution.

CU Lars.