[Radiance-general] running radiance on multiple cores

[Jack de Valpine]

I have had this problem (tiles getting written to the wrong xy image 
location) as well and tried to track down the issue to little avail. I 
think the easiest thing to do is render separate tiles and assemble as a 
post process. I think that this is also actually preferable at least 
from the standpoint of file locking over a network. Probably a variety 
of ways to do this.

I have not tried Giulio's trick with the populating the ambient cache, I 
would like to give it a try if I get a chance. Typically I have run one 
process to populate the ambient cache before distributing the tiles.

-Jack

See this before, many times.
> It seems to be related to the machine being under pressure and not 
> able to cope with the synch.
> So my suggestion is not to run too many things at the same time and 
> modulate the machine workload.
> Alternatively you should look into splitting rpict with vwrays. You 
> should be able to easily split images in tiles and render them and 
> assemble in the end.
> This would avoid synch issue as you would be doing the synch in the 
> end manually.
>
> One of the tricks that I have been using, unless you have -aa 0, is to 
> render the same thing with an ambient file in many processes at the 
> same time.
> It seems (and it has been proven with practise) to help the rendering 
> to come out faster.
> So nothing difficult, you need just to launch the same rendering over 
> each core, share the ambient file and retain just 1 image and trash 
> the others.
> Simple and effective.
> :-)
>
> G
>
>
> On 23 May 2012, at 16:50, Giovanni Betti wrote:
>
>> happen
>
>
>
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