fix Homebrew Open MPI

Author: simonbyrne

.github/workflows/UnitTests.yml

@@ -121,6 +121,7 @@ jobs:
     runs-on: macos-latest
     env:
       JULIA_MPI_TEST_BINARY: system
+      ZES_ENABLE_SYSMAN: 1  # https://github.com/open-mpi/ompi/issues/10142
 
     steps:
     - name: Checkout

docs/src/knownissues.md

@@ -34,6 +34,12 @@ This can be worked around be either:
 
 2. Launching julia with the  `--compiled-modules=no` option. This can result in much longer package load times.
 
+## Open MPI
+
+### Segmentation fault
+
+When attempting to use a system-provided Open MPI implementation, you may encounter a segmentation fault. This can be fixed by setting the environment variable `ZES_ENABLE_SYSMAN=1`. See [Open MPI issue #10142](https://github.com/open-mpi/ompi/issues/10142).
+
 ## UCX
 
 [UCX](https://www.openucx.org/) is a communication framework used by several MPI implementations.