[Yt-dev] Parallel Hop

[Stephen Skory]

Matt,

> 1. What is the status of determining, automatically, the necessary
> padding?  I have suggested that this could be some small multiple of
> the root grid dx, but I don't recall hearing back from you.  (I
> believe you have been using on the order of 6 root grid cells as
> padding.)

It depends on your cosmological size - not the gridding. Smaller volumes need bigger padding, but I've discovered that 'a little goes a long way.' The logic is that you want any object to at least exist fully in at least one of the padded subvolumes. So if your biggest object is a 200 Kpc halo in a 20 Mpc volume, you need at least 0.01 padding (in simulation units). So for this example, I'd set padding to 0.02 or 0.03 to be conservative. Is there a simple way to estimate the largest object one can expect in a certain cosmological volume?

> 2. Are there any outstanding bugs in SS_HopOutput that you have found
> prevent it from replacing the old one, and working in both serial and
> parallel?  (I have found none.)

I haven't found any either. In my opinion it's good to go.

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