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bug#73649: OpenMPI + mpi4py broken: rank=0

From: Lars Bilke
Subject: bug#73649: OpenMPI + mpi4py broken: rank=0
Date: Tue, 10 Dec 2024 14:03:44 +0100 
The issue seems that openmpi is version 5.x but mpi4py is compiled against 
version 4.x. You can get a consistent version by using this flag: 
--with-input=openmpi=openmpi@4.1.6.  I could fix the issue with this call:

guix shell python python-mpi4py openmpi \
  --with-input=openmpi=openmpi@4.1.6 -- \
  mpirun -n 12 python3 ...
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