Installation

maybempi is pure Python with no dependencies. It needs Python 3.10 or newer.

pip install maybempi

To run under MPI, install mpi4py as well, built against the MPI library of your system:

pip install "maybempi[mpi]"   # same as: pip install maybempi mpi4py

Without mpi4py, every process of an mpirun job runs serially as rank 0 of 1, and maybempi.get_mpi() warns about it.

Check what maybempi decides in an environment with the maybempi command (or python -m maybempi):

maybempi                      # in a terminal: serial
mpirun -n 2 maybempi --init   # rank 0 prints one table: rank, host, launcher variable, ...

From source

git clone https://github.com/max-models/maybempi.git
cd maybempi
pip install -e ".[dev]"

Extra	Installs
mpi	mpi4py
test	pytest, pytest-cov and NumPy
docs	the notebook runner, NumPy and griffe for the API reference
dev	formatters and linters, plus the test and docs extras