[yt-users] Problem with Rockstar in yt

[Brian O'Shea]

Hi folks,

Just a quick followup: I've now run this on a different machine and
verified that the reason I couldn't use Rockstar in parallel was due to a
MPI problem.  *HOWEVER*, I still have the same Rockstar error that I was
reporting before when I was using one core (all using the same script as in
my previous email):

http://paste.yt-project.org/show/3747/

So, it does seem like there is a bug, or I am simply using Rockstar
incorrectly...

--Brian



On Sun, Aug 4, 2013 at 6:26 PM, Brian O'Shea <bwoshea at gmail.com> wrote:

> Dear yt-users,
>
> I'm trying to use the Rockstar halo finder within yt, and am encountering
> some odd problems.  I'm using the main development tree (
> https://bitbucket.org/yt_analysis/yt) with changeset f936432ed45d, and
> attempting to use Rockstar to find halos on a small server running Ubuntu
> 12.04.  When I call this script:
>
> ---- file test_rockstar.py ----
>
> from yt.mods import *
> from yt.analysis_modules.halo_finding.rockstar.api import
> RockstarHaloFinder
>
> pf = load("DD0057/data0057")
> rh = RockstarHaloFinder(pf)
>
> ---
>
> using the command line sequence "mpirun -np 2 python ./test_rockstar.py
> --parallel", I seem to be getting a seg fault (as can be seen at
> http://paste.yt-project.org/show/3745/).  However, if I use a single
> processor (with "mpirun -np 1 python ./test_rockstar.py --parallel"), I get
> a very different error:
>
> Traceback (most recent call last):
>   File "./test_rockstar.py", line 6, in <module>
>     rh = RockstarHaloFinder(pf)
>   File
> "/data/bwoshea/galparttest/yt-x86_64/src/yt-hg/yt/analysis_modules/halo_finding/rockstar/rockstar.py",
> line 230, in __init__
>     self.pool, self.workgroup = self.runner.setup_pool()
>   File
> "/data/bwoshea/galparttest/yt-x86_64/src/yt-hg/yt/analysis_modules/halo_finding/rockstar/rockstar.py",
> line 112, in setup_pool
>     (self.num_writers, "writers") ]
>   File
> "/data/bwoshea/galparttest/yt-x86_64/src/yt-hg/yt/utilities/parallel_tools/parallel_analysis_interface.py",
> line 335, in from_sizes
>     pool.add_workgroup(size, name = name)
>   File
> "/data/bwoshea/galparttest/yt-x86_64/src/yt-hg/yt/utilities/parallel_tools/parallel_analysis_interface.py",
> line 303, in add_workgroup
>     group = self.comm.comm.Get_group().Incl(ranks)
> AttributeError: 'NoneType' object has no attribute 'Get_group'
>
> I'm puzzled about the error, since I can use other parallel yt scripts
> without any problems (a 4-processor script making projections works just
> fine).  This machine doesn't have infiniband (as warned about at
> http://yt-project.org/doc/analysis_modules/running_halofinder.html#rockstar-halo-finding),
> and both FOF and Hop find several hundred halos with my dataset.  I'd just
> use another halo finder, but I'm trying to do something that requires
> Rockstar to be run inline with Enzo, so I'm stuck with it...
>
> Does anybody have any idea what might be going on?
>
> Thanks!
>
> Brian
>
>
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