using xdist with mpi4py

I have some tests that use mpi4py, but I get an error when trying to run my test suite with MPI.

> mpirun -n 1 pytest -n 1 -q test_thing.py
bringing up nodes...
[gw0] node down: Not properly terminated
[gw1] node down: Not properly terminated
[gw2] node down: Not properly terminated
[gw3] node down: Not properly terminated
[gw4] node down: Not properly terminated

no tests ran in 3.24 seconds

Minimal reproducible example:

from mpi4py import MPI
import time

class TestThing(object):
    def test_one(self):
        time.sleep(1)
        assert False

    def test_two(self):
        time.sleep(5)
        assert True

I do not see this behavior with either

pytest -n 1 -q test_thing.py

or

mpirun -n 1 pytest -q test_thing.py

Does xdist support mpi4py?

Start with the minimal mpi4py example and reproduce the behavior using mpirun -n 1 pytest -n 1 -q test_thing.py, then compare it with the two commands that work without combining MPI and xdist. Determine whether the reported node shutdown is supported behavior or a defect; done means the compatibility outcome is established and reflected in the project’s behavior or documentation.