Commit 35c0b466 authored by Thomas Ponweiser's avatar Thomas Ponweiser
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Halo exchange sample (unstructured grids): updated README.md (known OpenMPI issue #1304)

parent 42023af7
......@@ -163,3 +163,15 @@ the command line output should look similar to
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Validation successful.
# Known issues
## OpenMPI issue #1304
There is a [known issue for OpenMPI](https://github.com/open-mpi/ompi/issues/1304) when a MPI Datatype is marked for deallocation (with `MPI_Type_free`) while still in use by non-blocking collective operations. If you are using OpenMPI and get a segmentation fault in MPI_Bcast, try to re-compile with:
make CFLAGS="-DOMPI_BUG_1304" clean all
This just disables two critical calls to `MPI_Type_free`.
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