[Yt-dev] L7 HOP center_of_mass problem

[Stephen Skory]

Hi all,

With the new setup, I'm getting negative values for the center_of_mass() for some of the haloes in L7 running parallel HOP. It's a small fraction of the total. I am not getting this effect on smaller datasets for this reason.

Because L7 takes a while to run through HOP, I haven't been able to do much testing yet. I've only run this on Ranger. I'm going to try on Kraken soon, but I suspect I'll get the same thing. I also suspect I'd get the same problem with parallel FOF. I haven't tested this on a serial run on L7, because it takes a long time. I'd guess that it would work OK. I'll see if I can get that going, too.

Matt, can you think of anything you changed when you did the HaloFinding switchover that would affect this?

I'll see what I can figure out, but I just wanted to see if anyone (Matt in particular) had some ideas of where this is coming from before I jump headlong into this.

Thanks!

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