[yt-users] volume rendering in parallel

[Sam Skillman]

Hi Matt and Luigi,
I haven't actually used the volume renderer in about 2-3 months at this
point so it's been stagnating on my end.  I'll take a look this weekend if I
get a chance.  I'm currently traveling so it might take a bit of extra time.
 Luigi - If you need the volume rendering capability in the very short term,
I'd suggest checking out a separate copy of yt 1.6 and using that when you
need the renders, and using 1.7 when you need the new features in 1.7.  This
isn't sustainable in the long run but is a quick fix if you need things
working right away.

Best,
Sam

On Fri, Aug 20, 2010 at 12:53 PM, Matthew Turk <matthewturk at gmail.com>wrote:

> Hi Luigi,
>
> > I attach to this e-mail a sample script for volume rendering. With YT 1.6
> I
> > used the old version of volume rendering (also in parallel) without
> problems,
> > but now (I run on trunk, with an updated revision) I can run this script
> only
> > on one CPU. If I try a parallel run, I get the following output:
>
> Yeah, looks like I broke it.  The new "camera" interface is far nicer
> for the user, but required some invasive changes.  The old mechanism
> for parallelizing volume rendering also required image plane
> decomposition, but Sam Skillman has implemented kD-tree decomposition
> with post-processing compositing of images, which should be much
> faster and easier on the system because it allows for a full
> volume-decomp and better load balancing.
>
> Sam, what's the current state of your kD-tree?  I think that since the
> image-plane decomp is currently broken, we can either fix that for
> both the volume_rendering and camera interfaces and continue to use it
> (even though it's worse) or we can finish up moving to the kD-tree.
>
> Either way, Luigi, this weekend I'll try to fix the script you sent,
> even if it ends up being kind of a hacky solution...
>
> -Matt
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-- 
Samuel W. Skillman
DOE Computational Science Graduate Fellow
Center for Astrophysics and Space Astronomy
University of Colorado at Boulder
samuel.skillman[at]colorado.edu
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