Oversubscribe openmpi run, as 4 cores are requested while GitHub acti…

…ons offers 2 cores

.github/workflows/miniconda.yml

@@ -78,7 +78,7 @@ jobs:
         export PATH="${CONDA_PREFIX}/bin:${CONDA_PREFIX}/Library/bin:$PATH" 
         which mpirun
         mpirun --version
-        mpirun -np 4 python mpi_example.py
+        mpirun -np 4 --oversubscribe python mpi_example.py
         if [ $? -ne 0 ] ; then
           echo "hdf5 mpi test failed!"
           exit 1