[Yt-dev] nickel instruction for using parallel HOP (not on Kraken)

[Britton Smith]

Stephen,

Your suspicion was correct.  For some reason, this simulation has a number
of particles with ids that are -1.  I went all the way back to the very
first output of that simulation and found 126 out of 256^3 particles to have
ids of -1.  I have absolutely no idea why this is.  This simulation data is
more than a year old, so it is possible there was a bug in enzo at the
time.  I just tested ParallelHOP out on a much newer dataset and it worked
without a problem.

Thanks a lot for your help and thanks again for writing this code.

Britton

On Tue, Dec 1, 2009 at 12:22 PM, Stephen Skory <stephenskory at yahoo.com>wrote:

> Britton,
>
> >>Ok, I got one of these:
> >
> >Real index -1!!!
> >
> >I didn't get a "Padded index -1!!!".  You're suspicion seems to have been
> right.
>
> So it seems to me that you probably have a particle with index == -1. There
> are a few things we can try. If you have just one with -1, we can change the
> default 'empty' value in those arrays to something else. I suspect you won't
> have just one, however, at which point you're kind of up a creek, because
> that's absolutely required for parallel HOP.
>
> It may be worth your time to fix the -1 IDs to something unique in the enzo
> dataset.
>
> I should add a check that screens for bad particle index values, like -1.
> I've learned something today.
>
> Let me know if there's anything else I can help you with!
>
>  _______________________________________________________
> sskory at physics.ucsd.edu           o__  Stephen Skory
> http://physics.ucsd.edu/~sskory/ <http://physics.ucsd.edu/%7Esskory/> _.>/
> _Graduate Student
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