[yt-dev] Projection issues

[david collins]

Yeah, they're different.  It'll take me a minute to track down which
parent has gone wrong, but thanks for the tip.

d.

On Wed, Mar 14, 2012 at 3:56 PM, Matthew Turk <matthewturk at gmail.com> wrote:
> On Wed, Mar 14, 2012 at 5:48 PM, david collins <antpuncher at gmail.com> wrote:
>> Hi again--
>>
>> I have another odd issue, again stemming from with this vintage
>> dataset.  It's a 512^3 root with 4 levels, and a refinement by 4.
>>
>> When the parallel analysis gave me problems yesterday, I tried
>> re-griding the data by restarting and forcing parallel root grid io on
>> (including a removal of the rebuild hierarchy call to ensure the grids
>> stay the same, and returning before any hydro is done.)  The odd bit
>> is now projections look different.  Attached are two images,
>> sphere_serial is through the old serial  root grid run,
>> sphere_parallel is through the output with parallel root grid io.
>> Centered on the max, 0.02 in radius, Density projection.  Projections
>> were made using
>> proj = pf.h.proj(ax,field,center=center,source=sphere)  You can see
>> that less structure seems to be captured in the parallel dataset.
>>
>> I've done two checks to make sure that it's not a glitch in the
>> re-griding.  First is the actual data-- the grids are in a different
>> order from parallel to serial, but once that's taken into account all
>> the data in subgrids is identical (at least in density, the field in
>> question).  Additionally the new tiles match the corresponding
>> positions in the old tile.  So the data itself is fine.
>>
>> The other test I did was to regrid, but leaving serial root grid io
>> on-- new serial set is identical (except again for grid order) to the
>> old, and the projections match.
>>
>> Differences also show up in profiles.
>>
>> Again, not a major problem, but it's pretty counter-intuitive, so I
>> was wondering if anyone had run into this.
>
> I haven't run into this, but my initial guess is that the hierarchy is
> no longer completely accurate.  This can be tested by doing:
>
> nc = sum(g.child_mask.sum() for g in pf.h.grids)
> print nc
>
> This number should be the same for both, and if it isn't, there's a
> problem with child/parent relationship.
>
> -Matt
>
>>
>> d.
>>
>>
>> --
>> Sent from my computer.
>>
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