Python bindings for AMReX-MPMD

[siddanib]

This PR is a draft that includes python bindings for Multiple Program Multiple Data (MPMD) feature of AMReX. This feature depends on MPI for the involved C++ executable and mpi4py for the involved python script. The submitted python bindings are based on the latest AMReX_MPMD.H and AMReX_MPMD.cpp.

[ax3l]

From Slack:

Could you please consider this particular branch for testing the previous approach (https://github.com/siddanib/pyamrex/tree/development).
Could you please use this particular case for testing (https://github.com/siddanib/pyamrex/tree/development/tests/test_MPMD/MultiFab_two_way). AMREX_HOME in GNUmakefile needs to be changed.
I installed pyAMReX as follows:

cmake -S . -B build -DAMReX_SPACEDIM="1;2;3" -DpyAMReX_amrex_src=/home/bsiddani/siddanib_github/amrex
cmake --build build -j 8 --target pip_install

For the test case:
I first build the main.cpp file as follows

make -j 10

Then I run the MPMD case as follows

mpirun -np 8 ./main3d.gnu.DEBUG.MPI.ex : -np 4 python main.py

I will submit two clean examples once we figure out this issue. Please let me know if any additional information is needed. Thanks!

[ax3l]

Thank you, LGTM! :)

As a follow-up PR, can you add a tests/test_MPMD/test_1/README.rst file that describes the exact steps how to run this test?

[ax3l]

I have to unbreak the macOS CI separately :)
Just a breaking change in homebrew/pip interaction.