Hi Max, Thanks for the message and the info…yes it is helpful because it narrows down the problem.
I you have an Ubuntu OS, give the parallel meep a try and see if you can get it to work. You don’t need a multicore processor or a cluster (at least I don’t think you do)…the parallel environment works in Scheme even if you are just using one core so I presume it should in python meep as well. The CONDA instructions on the GitHub readthedocs site are simple and straight forward. It installs as its own environment so you don’t have to worry about messing up your stand-alone installation. Best regards, John > On 4 Aug 2018, at 16:51, Max Kellermeier <max.kellerme...@hotmail.de> wrote: > > Dear John, > > I haven't tried the parallel version of python meep yet, but the very first > line, > import meep as mp > is very essential. Otherwise, you are executing a python script without meep > at all. The line is necessary to tell python to use meep. > The exception you get comes from the fact that the vector3 class is part of > the meep module which was not imported. 'mp' is just the abbreviation for > meep you declare with '... as mp'. You could also write 'import meep' in the > first line and use the vector3 class via 'meep.ve <http://meep.ve/>ctor3'. > > Anyways, adding the import line back to you script won't help you to fix the > original issue. But at least you know that you need it. > > I hope, I could help you a little bit at least! > > Best regards, > Max > > > ------ Originalnachricht------ > Von: John Weiner > Datum: Sa., 4. Aug. 2018 16:03 > An: meep-discuss@ab-initio.mit.edu; > Cc: > Betreff:[Meep-discuss] getting parallel python meep up and running > > 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 > <https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmeep.readthedocs.io%2Fen%2Flatest%2FInstallation%2F%23conda-packages&data=02%7C01%7C%7Ce4c2eb6afd014756e82a08d5fa130b7e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636689882052808778&sdata=bFKp8aM6Rtl4A4bSJJSR0UWw%2FljqFa4cffMRfvI%2BLa4%3D&reserved=0>, > 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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