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felker avatar felker commented on July 20, 2024

Update: it turns out that is a known MPICH bug on macOS pmodels/mpich#1782

It was apparently fixed in the MPICH repository about a month ago: pmodels/mpich#2755

Now, I am unable to reproduce the bug with OpenMPI on macOS. I don't think any modification needs to be made to the Athena++ regression test suite at this time. It is just something for macOS users to be aware of when running it with MPICH version < 3.2.1 which was released on 11/10/2017. Presently, Homebrew users need to install MPICH with the --HEAD flag to get the patched 3.2.1. The --devel flag results in the year-old https://github.com/pmodels/mpich/releases/tag/v3.3a2

from athena.

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