Parallel FEniCS test case fails about tutorials

[ajaust]

It seems that I fixed my problems with the precice bindings. (see precice/fenics-adapter#39 (comment)). I upgraded to preCICE 1.6.0 and installed the FEniCS-adapter after having the Python bindings installed.

python3 -m pip install --user .
python3 -c "import fenicsadapter"
/home/jaustar/projects/fenics-precice-parallel/fenics-adapter/fenicsadapter/core.py:14: Warning: This version of the precice bindings is deprecated and will be removed in preCICE version 2.0.0. You may import the updated python module using "import precice_future as precice" instead. Refer to the changelog for more information.
  import precice

The warning sounds reasonable to me and indicates that the adapter is installed. However, the parallel test case still shows the same error.

python3 heat.py -d
/home/jaustar/.local/lib/python3.6/site-packages/fenicsadapter/core.py:14: Warning: This version of the precice bindings is deprecated and will be removed in preCICE version 2.0.0. You may import the updated python module using "import precice_future as precice" instead. Refer to the changelog for more information.
  import precice
Traceback (most recent call last):
  File "heat.py", line 161, in <module>
    interpolation_strategy = fenicsadapter.core.ExactInterpolationExpression
AttributeError: module 'fenicsadapter.core' has no attribute 'ExactInterpolationExpression'

[ajaust]

So... I was able to figure out something more.

I went back to the master branch

git checkout master
git pull

I rebuilt the adapter and now the error message that I had before disappeared. The tutorial HT/partitioned-heat/fenics-fenics works. However, the parallel example in the branch parallelFenics seems to use an older fenicsadapter interface. The parallel example is importing the adapter as

import fenicsadapter.core

while the non-parallel example does

from fenicsadapter import Adapter, ExactInterpolationExpression, GeneralInterpolationExpression

Now the parallel example fails with

mpirun -np 1 python3 heat.py -d
/home/jaustar/.local/lib/python3.6/site-packages/fenicsadapter/fenicsadapter.py:16: Warning: This version of the precice bindings is deprecated and will be removed in preCICE version 2.0.0. You may import the updated python module using "import precice_future as precice" instead. Refer to the changelog for more information.
  import precice
Traceback (most recent call last):
  File "heat.py", line 33, in <module>
    import fenicsadapter.core
ModuleNotFoundError: No module named 'fenicsadapter.core'

I checked the source code and came to the conclusion that the adapter in master is only suitable for serial runs. Now, I removed the fenicsadapter, checked out the parallelFenics branch of the tutorial and the adapter and end up with

  import precice
Traceback (most recent call last):
  File "heat.py", line 161, in <module>
    interpolation_strategy = fenicsadapter.core.ExactInterpolationExpression
AttributeError: module 'fenicsadapter.core' has no attribute 'ExactInterpolationExpression'

again. I checked core.py (see here) and there is no class called ExactInterpolationExpression. This class (and also GeneralInterpolationExpression) only exist in the serial adapter in the main branch.

[IshaanDesai]

The parallel functionality in fenics-adapter is being developed from scratch based on the new design. The current state of this implementation is in this PR: precice/fenics-adapter#71
With this new proposed implementation the HT/partitioned-heat/fenics-fenics test case will work directly.

[IshaanDesai]

The parallel FEniCS case for the partitioned heat conduction tutorial is now working in this state.