GNU bug report logs - #73649
OpenMPI + mpi4py broken: rank=0

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From: Antero Mejr <mail <at> antr.me>
To: 73649 <at> debbugs.gnu.org
Subject: bug#73649: OpenMPI + mpi4py broken: rank=0
Date: Sun, 06 Oct 2024 01:01:33 +0000

Running this command:

guix shell python python-mpi4py openmpi -- mpirun -n 12 python3 \
-c "from mpi4py import MPI; comm = MPI.COMM_WORLD;
print(comm.Get_rank())"

should print the numbers 0-11. Instead it prints 0 11 times. The same
behavior occurs in a container or pure environment.

This breaks any code using mpi4py, because ranks >0 must be available
for multi-threaded code to work.

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