[Yt-dev] Parallel Hop

[Matthew Turk]

Alright, I'm on board.

Next step is some determination of the padding.  I think this likely
should be done in terms of root grid dimensions; it seems we've had
some good success with low integer multiples of
(DomainRightEdge-DomainLeftEdge)/RootGridDimensions .  As I recall,
you said 0.02 was sufficient for your 64^3 run?  Or am I
misremembering?

On Sat, Jan 24, 2009 at 10:09 AM, Stephen Skory <stephenskory at yahoo.com> wrote:
>
>> 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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