[Yt-dev] Parallel Hop

[Stephen Skory]

> Okay, so we're looking at one particle different in the most massive
> halo, two in one of the less massive ones between 4 & 2 processors.
> What do the rest of you think?  I am torn between being anal about
> this and just saying that's not a big deal.

One or two parts in 260,000 is pretty darn good. So I am inclined to say it's not a big deal.

I've been bouncing ideas around in my head as to why I think this kind of variance is unavoidable. If you take a perverse situation where there is only one particle in a subbox, clearly determining its overdensity is ridiculous. But this says for subboxes with more reasonable numbers of particles, the overdensity is not as determined as for the whole box. I think subdividing the whole introduces error.

Uh, I dunno, at any rate I think we're at the point of diminishing returns. 

_______________________________________________________
sskory at physics.ucsd.edu           o__  Stephen Skory
http://physics.ucsd.edu/~sskory/ _.>/ _Graduate Student
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