On Wed, Oct 26, 2016 at 2:51 PM, Reju Sam John <rejusamjohn@gmail.com> wrote:

Hi all,

I am trying to run Rockstar Halo Finding with the following code.

from yt.mods import * from yt.analysis_modules.halo_finding.rockstar.api import RockstarHaloFinder

#find all of our simulation files files = glob.glob("RD*/*hierarchy")

#hopefully the file name order is chronological files.sort() print files

ts = TimeSeriesData.from_filenames(files[:]) rh = RockstarHaloFinder(ts) rh.run()

but I am getting the following error. File "rockstar_halo_finding.py", line 14, in <module> rh = RockstarHaloFinder(ts) File "/home/john/yt_new/yt-x86_64/src/yt-hg/yt/analysis_modules/ halo_finding/rockstar/rockstar.py", line 220, in __init__ self.pool, self.workgroup = self.runner.setup_pool() File "/home/john/yt_new/yt-x86_64/src/yt-hg/yt/analysis_modules/ halo_finding/rockstar/rockstar.py", line 102, in setup_pool (self.num_writers, "writers") ] File "/home/john/yt_new/yt-x86_64/src/yt-hg/yt/utilities/ parallel_tools/parallel_analysis_interface.py", line 325, in from_sizes pool.add_workgroup(size, name = name) File "/home/john/yt_new/yt-x86_64/src/yt-hg/yt/utilities/ parallel_tools/parallel_analysis_interface.py", line 293, in add_workgroup group = self.comm.comm.Get_group().Incl(ranks) AttributeError: 'NoneType' object has no attribute 'Get_group'

could you please explain what is going wrong here ?

Rockstar has to be run in parallel. There is an example, in the docstrings for RockstarHaloFinder: http://yt-project.org/docs/dev/reference/api/generated/yt.analysis_modules.h...

Thank you. -- Reju Sam John

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