MPIPoolExecutor not working with Open MPI 3.0

[Keichi Takahashi]

Hi, I tried to run julia.py from the tutorial, but it fails with the following error:

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mpiexec does not support recursive calls

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Here is the command I used:

$ OMPI_UNIVERSE_SIZE=4 mpiexec -np 1 python3 julia.py

And some platform info:

• mpi4py: 3.0.0
• Open MPI 3.0.0
• Python 3.6.3
• OS: macOS 10.13.1

I also confirmed that the same script works with MPICH 3.2.1.

Am I missing something?

[Lisandro Dalcin]

This seems to be a bug in Open MPI 3.0.0, look yourself:

$ mpiexec -n 1 hostname
kl-13999.local

$ OMPI_UNIVERSE_SIZE=4 mpiexec -n 1 hostname


**********************************************************

mpiexec does not support recursive calls

**********************************************************

You should google/ask/report the problem to Open MPI folks.

[Keichi Takahashi]

You're right, thanks!