ImportError: cannot import name mpi_comm_world

Question

I am trying to run a fenics application, however it crashes as following :

File "/cluster/home/imranal/Oasis/common/io.py", line 8, in
from dolfin import MPI, Function, XDMFFile, HDF5File, info_red, VectorFunctionSpace, mpi_comm_world
ImportError: cannot import name mpi_comm_world

I tried autocompleting in ipython, and it found only the following with MPI :

from dolfin import mp
MPI
MPICH_IGNORE_CXX_SEEK
MPICommunicator
MPIInfo
MPINonblocking

I have dolfin 1.3.0.

Comments

This was introduced in dolfin after 1.3.0, and Mikael has probably kept Oasis more or less up to date with development version. As with fenicstools, see if you can use Oasis 1.3.0 release.

---

Thanks for pointing out the similar error I was experiencing at http://fenicsproject.org/qa/3549/instant-recompile-module-compile-with-command-make-verbose . Fixed this one by using git checkout v1.3. Matching my dolfin version.

Answer 1

As Øyvind Evju commented, I had a mismatch between my dolfin version and Oasis.

Using git checkout v1.3 fixed the issue.

Thanks Øyvind Evju.