[Yt-dev] Parallel Hop

[Matthew Turk]

Okay, 0.1 works for the 64^3 run, which would be 6.4 root grid cells
in that simulation.  Obviously it would be nice to have this in a
scale-dependent format, but since HOP is formally scale-free, I think
we should be able to do it in terms of total-number-of-particles.
I'll set up some tests on some 128^3 and 256^3 datasets I have here.

-Matt

On Sat, Jan 24, 2009 at 10:25 AM, Stephen Skory <stephenskory at yahoo.com> wrote:
>
>> 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?
>
> I did tests with 0.0, 0.05, and 0.2 padding, and even with my massive halo the 0.05 padding was almost the same (by one or two particles) as the 0.2 case for runs of p>=4. My inclination is to default to something conservative (say 0.1, I think 0.2 is too much and wasteful) and document what padding means so users understand why they might want a padding bigger or smaller than the default.
>
>  _______________________________________________________
> sskory at physics.ucsd.edu           o__  Stephen Skory
> http://physics.ucsd.edu/~sskory/ _.>/ _Graduate Student
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