Hello to all,
Having gotten the impression that future development of meep will be
essentially in python meep, I have taken the first tentative baby steps
to get python meep working on my pc Ubuntu box. Scheme meep, both
stand-alone and parallel, is now working on this box running Ubuntu
18.04 LTS.
Using the CONDA package, I was able to install one-core python meep
without incident. It works.
Then I tried to install the parallel version using the instructions at
https://meep.readthedocs.io/en/latest/Installation/#conda-packages, and
in particular,
|conda create -n pmp -c chogan -c conda-forge pymeep-parallel source
activate pmp |
But when I tried to run a .py script using
mpirun -np 2 python foo.py,
I got the MPI error about init being disallowed, etc. I think this
problem has been observed and discussed earlier.
I then tried the nightly builds and was able to create the environment
pmp_test. When I entered the same mpirun command line as above, I got
the following message,
File "<string>", line 1, in <module>
File
"/home/john/.conda/envs/pmp_test/lib/python3.6/site-packages/meep/__init__.py",
line 8, in <module>
from . import _meep
ImportError:
/home/john/.conda/envs/pmp_test/lib/python3.6/site-packages/meep/_meep.so:
undefined symbol:
_ZN4meep6fields17add_volume_sourceENS_9componentERKNS_8src_timeERKNS_6volumeEPKcS9_St7complexIdE
I thought that maybe the first line in the foo.py file,
import meep as mp
was not correct. So I deleted it and ran the script again. Then I got
the error message,
Traceback (most recent call last):
File "straight_waveguide.py", line 2, in <module>
cell = mp.Vector3(16, 8, 0)
NameError: name 'mp' is not defined
which I take to mean that maybe the meep library is not "imported"
without the import command or there is some more serious problem in the
meep library.
I don't know what to do to move forward with python parallel meep and
would appreciate any help.
Best regards,
John
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