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Subject: bug#73649: OpenMPI + mpi4py broken: rank=0
Resent-From: Antero Mejr <mail@HIDDEN>
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Date: Sun, 06 Oct 2024 01:01:33 +0000
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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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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Antero Mejr <mail@HIDDEN>
Subject: bug#73649: Acknowledgement (OpenMPI + mpi4py broken: rank=0)
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Date: Sun, 06 Oct 2024 01:02:02 +0000

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Subject: bug#73649: OpenMPI + mpi4py broken: rank=0
References: <87ttdqjb82.fsf@HIDDEN>
Resent-From: Lars Bilke <lars.bilke@HIDDEN>
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Date: Tue, 10 Dec 2024 14:03:44 +0100
From: Lars Bilke <lars.bilke@HIDDEN>
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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@HIDDEN  I could fix the issue with this call:

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

Message sent to bug-guix@HIDDEN:

Subject: bug#73649: OpenMPI + mpi4py broken: rank=0
Resent-From: Antero Mejr <mail@HIDDEN>
Original-Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
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To: Lars Bilke <lars.bilke@HIDDEN>
Cc: 73649 <at> debbugs.gnu.org
From: Antero Mejr <mail@HIDDEN>
In-Reply-To: <B416E6A1-3198-4433-AF5C-C3EDE3A2B7EA@HIDDEN> (Lars Bilke's
 message of "Tue, 10 Dec 2024 14:03:44 +0100")
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Date: Wed, 11 Dec 2024 18:35:27 -0500
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Lars Bilke <lars.bilke@HIDDEN> writes:

> The issue seems that openmpi is version 5.x but mpi4py is compiled against
> version 4.x.

That does fix it, thanks. Maybe packages built against MPI 4.x should
be upgraded to the default MPI version, because the docs say:

"The Open MPI v5.0.x series shared libraries are ABI compatible with
Open MPI v4.0.x and v4.1.x, with a few exceptions for Fortran."

https://docs.open-mpi.org/en/v5.0.x/version-numbering.html

Last modified: Sun, 12 Jan 2025 05:45:02 UTC

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